Entries |
Document | Title | Date |
20080278021 | Stress Distributing Permanent Magnet Rotor Geometry For Electric Machines - A rotor includes a cylindrical rotor core having an outer circumferential surface and a plurality of magnet insertion holes formed in the rotor core and arranged circumferentially at a preset angular interval about the rotational axis of the rotor core. Each hole extends in a direction parallel to the rotational axis and has a cross section of a generally elongated slit. The elongated slit is curved concave relative to the circumferential surface and has a radially inward side, a radially outward side, and two ends that are respectively spaced apart from the circumferential surface by two bridges, wherein each bridge has thinner and thicker portions that are respectively positioned near the radially inward and outward sides. One or more permanent magnets are inserted in each hole and arranged to transfer centrifugal forces acting on the magnets during operation to portions of the bridges. | 11-13-2008 |
20080278022 | Conical magnets and rotor-stator structures for electrodynamic machines - Embodiments of the invention provide for conical magnets for rotors in electrodynamic machines, methods to design the same, and rotor-stator structures for electrodynamic machines. In various embodiments, a rotor-stator structure for electrodynamic machine can include field pole members and conical magnets. According to at least some embodiments, one or more of the conical magnets can include a magnetic region configured to confront one or more air gaps. The magnetic region can be substantially coextensive with one or more acute angles to the axis of rotation. The magnetic region can also include a surface positioned at multiple radial distances from the axis of rotation in a plane perpendicular to the axis of rotation. | 11-13-2008 |
20090021095 | Rotary electric machine - A rotary electric machine capable of effectively utilizing both end faces of a rotor in the rotating axis direction by suppressing magnetic saturation comprises a stator having axial parts ( | 01-22-2009 |
20090021096 | ROTARY ELECTRIC MACHINE - A rotary electric machine capable of effectively utilizing both end faces of a rotor in the rotating axis direction comprises a stator and a rotor. The stator comprises a radial part disposed in the rotating axis direction and axial parts disposed in the radial direction. The radial part and the axial parts comprise teeth and coils. The rotor comprises a rotor shaft, a rotor core, and a magnet. The rotor core comprises a radial part and axial parts. The magnet comprises a radial part and axial parts. The radial part and the axial parts of the magnet are formed to face the radial part and the axial parts and of the stator. | 01-22-2009 |
20090026868 | BELT ALTERNATOR STARTER MOTOR GENERATOR FOR HYBRID VEHICLES - A stator assembly comprises a stator defining S slots. First and second windings are arranged in each of the S slots. The two windings have a width in a radial direction and a thickness in a direction perpendicular to the radial direction. A ratio of the width to the thickness is between 3.0:1 and 4.5:1. | 01-29-2009 |
20090134731 | MAGNET TYPE SYNCHRONOUS MACHINE - In a SPM synchronous motor has a rotor and a stator, a permanent magnet is divided to magnet parts magnetized in a diameter direction of the rotor and serve as rotor magnetic poles. The rotor magnetic poles are alternately arranged along a circumferential direction of the rotor. The rotor core has a plurality of salient poles made of soft magnetic material. Each salient pole projects from the circumferential surface of the rotor core toward a gap between the rotor and the stator, and is placed at a central part of the corresponding magnet part in the circumferential direction. This structure increases a magnitude of a d-axis inductance Ld and enhances the effects obtained by performing a weakening magnetic flux control using a negative d-axis current Id during a high speed rotation of the motor within a power source voltage limiting range. | 05-28-2009 |
20090195104 | PERMANENT MAGNET SYNCHRONOUS MOTOR - To obtain a permanent magnet synchronous motor suitable for an electric power steering system, in which the magnet thickness (magnet used amount) can be reduced while securing demagnetization resistance and torque characteristics. In a permanent magnet synchronous motor including a rotor in which plural permanent magnets are arranged at an outer periphery of a rotor core, which is supported so as to rotate freely, and a stator provided at the outside of the stator and having stator windings | 08-06-2009 |
20090251023 | PERMANENT MAGNET ROTATING ELECTRIC MACHINE AND ELECTRIC POWER STEERING DEVICE USING THE SAME - A permanent magnet rotating electric machine includes: a stator including: a stator core having teeth, and an armature winding wound around each of the teeth to configure the multiple phases; and a rotor including a rotor core, and permanent magnets provided in order around the rotor core. The rotor is arranged to be spaced apart from the stator with an air gap therebetween. Each of the permanent magnets has a curved surface opposed to the stator and is configured to satisfy the following relationship: | 10-08-2009 |
20090267439 | GENERATOR CONSTITUTED TO GENERATE ELECTRIC POWER BY RING-SHAPED ROTATIONS - Provided is a generator in which straight rod magnets have been heated to form curved ones, with the identical polarity ends of the magnets having been forcibly butted together by diamagnetic connecting devices to form a field element ring. The field element ring is arranged through three Y-shaped sets (evenly spaced apart) of one inner and two outer roller devices set on a base steel sheet. Rotary drive force is applied from the centrally placed drive motor to one of the inner and outer roller devices to rotate the field element ring. Between, and in line with, the three sets of inner and outer roller devices are arranged three segments of an armature coil that is wound around the field element ring. In turn, the armature coil is encased within three segments of an armature core that are set on the base steel sheet. The rotary action of the field element ring within the armature coil generates a magnetic flux to admit into the armature coil, thus inducing an electromotive force. The electromotive force permeates the armature core, and thus the armature coil and the field element ring, to generate electricity. | 10-29-2009 |
20090309449 | Driving Apparatus - A rotating electric machine comprises a stator having stator salient poles, three-phases windings would around said stator salient poles, a rotor rotatable held inside the said stator, and permanent magnets inserted into said rotor and positioned opposite to said stator salient poles. The three-phase windings are concentratively wound around each of the stator salient poles, with windings of each phase wound around at more than one stator salient pole. The windings of each phase have a phase difference of voltage between at least one of the windings and the other. | 12-17-2009 |
20100013338 | PERMANENT MAGNET-TYPE ROTARY ELECTRIC MACHINE AND PRODUCTION METHOD FOR ROTOR FOR PERMANENT MAGNET-TYPE ROTARY ELECTRIC MACHINE - A production method for a rotor for a permanent magnet-type rotary electric machine, includes the step (S | 01-21-2010 |
20100066191 | ROTOR AND ELECTRIC MOTOR - The invention relates to a rotor ( | 03-18-2010 |
20100096940 | COMPRESSOR MOTOR AND COMPRESSOR - A compressor motor includes a rotor and a stator disposed radially outside of the rotor. The rotor includes a rotor core, and a plurality of magnets circumferentially arranged on the rotor core at center angles of equal intervals. The rotor core has an axial length L and, a radial length D. Each of the magnets has a thickness t. L/D<0.7, and t>(1×K×N)/(L | 04-22-2010 |
20100102663 | ELECTRICAL MACHINE - The present invention relates to an electrical machine having a rotor, a stator, a rotating-field production device, and a pole-field production device. The rotor can rotate about a rotation axis which passes through opposed upper and lower portions of the rotor. The rotating-field production produces an essentially radial magnetic field which rotates about the rotation axis of the rotor. The pole-field production device produces a magnetic field of opposite polarity to the rotor on the upper and lower portions. In order to reduce the size of the electrical machine without reducing the power, the pole-field production device has at least one magnet. | 04-29-2010 |
20100109467 | FIELD ELEMENT - The field magnet is formed of, for example, two permanent magnets, and a width of the field magnet increases from a center toward both ends thereof in a monotonically non-decreasing manner. The field magnet includes, at the both ends thereof, projecting portions projecting to a side opposite to a rotation axis. The field core includes a penetration hole through which the field magnet is caused to penetrate. The penetration hole includes penetration surfaces which cover magnetic pole surfaces of the field magnet, respectively. Specifically, the penetration surface includes concave portions with which the projecting portions are fitted. When the field magnet is inserted, the penetration surfaces serve as a guide which guides the field magnet, and accordingly the field magnet can be caused to penetrate through the penetration hole with ease. | 05-06-2010 |
20100156227 | COMPLEMENTARY PERMANENT MAGNET STRUCTURE CAPABLE OF MINIMIZING COGGING TORQUE FOR ROTATING ELECTRIC MACHINE - A complementary permanent magnet structure capable of minimizing the cogging torque for a rotating electric machine, the complementary permanent magnet structure comprising: a magnetic pole core being cylinder shaped with even numbered arc-shaped magnetic sets positioned with equal distances on the circumference thereof, each magnetic set being composed of a first permanent magnet unit and a second permanent magnet unit; and an armature core being ring shaped with a plurality of slots; wherein the ratio of the number of the slots to the number of magnetic poles of the magnetic pole core is 3/2; wherein the first permanent magnet unit and the second permanent magnet unit are positioned correspondingly to generate two complementary cogging torques with 180 degrees of electrical angle difference. | 06-24-2010 |
20100176680 | Permanent magnet motor - There is provided a permanent magnet motor capable of reducing cogging torque and torque ripple while suppressing a decrease in motor output. In a permanent magnet motor | 07-15-2010 |
20100225191 | ROTOR HAVING EMBEDDED PERMANENT MAGNET - A structure for arranging a permanent magnet suitable for a rotor core having a thin, circular, hollow ring section and a structure for reducing the amount of the permanent magnet are provided. | 09-09-2010 |
20100244608 | PERMANENT MAGNET, MANUFACTURING METHOD THEREOF, AND ROTOR AND IPM MOTOR - A manufacturing method for a permanent magnet includes the steps of a) producing a permanent magnet ( | 09-30-2010 |
20100264770 | PERMANENT-MAGNET SYNCHRONOUS MACHINE WITH SUPPRESSION MEANS FOR IMPROVING THE TORQUE RIPPLE - A permanent-magnet synchronous machine for suppressing harmonics includes a stator and a rotor with permanent magnets. Each permanent magnet represents a magnetic pole and is, when viewed in the circumferential direction of the rotor, shaped as a parallelogram or an arrow. The pole coverage is less than one. The permanent magnets are staggered at a staggering angle, wherein the permanent magnets of one pole are arranged in the axial direction with an increasing offset of a circumferential angle in relation to a first permanent magnet of this pole. Each permanent magnet is skewed at a skew angle defined by a circumferential angle of a projection of a tip portion of the parallelogram or arrow. The optimal skew and staggering angles are calculated from the design parameters for the stator and the number of pole pairs and the number of poles in the axial direction of the rotor. | 10-21-2010 |
20100289369 | Generator for wind power installations - A generator for a wind power has teeth which are surrounded by windings and separated by slots, and permanent magnets that form the poles of the exciter field. The ratio of the number of slots to the product of the numbers of poles and winding phases is fractional and >1. Alternatively or additionally, the front and/or rear edges of successive poles or groups of poles are oppositely inclined to the axis of rotation. | 11-18-2010 |
20100308678 | Permanent Magnet Machine - A permanent magnet electric machine with optimum motoring efficiency is disclosed. It is adapted for use in a hybrid electric vehicle powertrain. An asymmetric magnetic flux distribution pattern in the rotor of the machine is established by asymmetrically positioning rotor openings relative to rotor magnets to improve operating efficiency of the machine when it is in a motoring mode. | 12-09-2010 |
20110193439 | ROTOR OF ELECTRIC MOTOR AND ELECTRIC MOTOR AND VENTILATION FAN AND COMPRESSOR - Disclosed is a rotor for an electric motor in which permanent magnets can be arranged efficiently. A rotor of the electric motor according to the present invention comprises a rotor core constructed by punching out silicon steel lamination plates into a predetermined shape and laminating a predetermined number of the silicon steel lamination plates; a plurality of cavities provided on the rotor core; flat-shaped permanent magnets having a cross-sectional face made by a long side and a short side, inserted to the cavities; a chamfered portion formed on a portion of, among intersecting points of the long side and the short side of the permanent magnets, at least the intersecting point near an outer peripheral portion of the rotor core. | 08-11-2011 |
20110234037 | STATOR AND ROTOR-STATOR STRUCTURES FOR ELECTRODYNAMIC MACHINES - Embodiments of the invention relate generally to electric motors, alternators, generators and the like, and more particularly, to stator structures and rotor-stator structures for motors that can be configured to, for example, reduce detent. | 09-29-2011 |
20110241469 | PERMANENT MAGNET, AND METHOD FOR MANUFACTURING A PERMANENT MAGNET - A permanent magnet, in particular a permanent magnet rotor for a machine, includes a first sleeve, a first cap and a second cap arranged to close off an inner opening of the first sleeve, and a permanent magnet material formed in the inner opening of the sleeve between the first cap and the second cap. The permanent magnet material is a compressed, non-bonded powder material including hard magnetic powder material, soft magnetic powder material, or a combination of hard and soft magnetic powder material. A method for manufacturing a permanent magnet rotor is also provided. | 10-06-2011 |
20120025655 | MOTOR ROTOR AND MOTOR HAVING THE MOTOR ROTOR - A motor rotor includes an annular body and a magnetic body installed on an inner lateral surface of the annular body. The magnetic body has a first curved surface and a second curved surface opposing the first curved surface. The magnetic body props against the inner lateral surface of the annular body via the first curved surface. The first curved surface has a first curvature less than a second curvature of the second curved surface. Because the magnetic body of the motor rotor has an uneven thickness, and an air gap interval formed between the motor rotor and the stator also has an uneven width, forces applied to a region where the magnetic forces change directions are smooth. Therefore, the vibration of the whole motor is reduced, and the noises are suppressed effectively. | 02-02-2012 |
20120032549 | Permanent Magnet Machine - A permanent magnet electric machine with optimum motoring efficiency is disclosed. It is adapted for use in a hybrid electric vehicle powertrain. An asymmetric magnetic flux distribution pattern in the rotor of the machine is established by asymmetrically positioning rotor openings relative to rotor magnets to improve operating efficiency of the machine when it is in a motoring mode. | 02-09-2012 |
20120126654 | PERMANENT MAGNET BRUSHLESS MOTOR - A permanent magnet brushless motor is provided. The motor includes a stator having a tubular-shaped member and a plurality of tooth members extending radially inwardly from the tubular-shaped member. Each tooth member has an arcuate-shaped convex surface disposed proximate to an interior region defined by the stator. Each arcuate-shaped convex surface is defined by a first radius that is rotated about a respective center point that is disposed radially outside of the stator. The motor further includes a rotor disposed within the interior region of the stator. | 05-24-2012 |
20120175988 | Rotating Electric Machine for Vehicular Use - A rotating electric machine for vehicular use includes: a stator that includes a stator core and a stator winding wound at the stator core; and a rotor that is rotatably disposed relative to the stator and includes a rotor core formed by laminating a plurality of electromagnetic steel sheets with a plurality of magnet insertion holes formed therein and includes a plurality of permanent magnets each held in each of the plurality of magnet insertion holes to form a magnetic pole. Each of the plurality of permanent magnets extends along a rotor axis and is formed in a shape assuming at least two different lengths along a circumference of the rotor. | 07-12-2012 |
20120194025 | PERMANENT MAGNET, MOTOR ROTOR OR STATOR, ROTARY ELECTRIC MACHINE - A permanent magnet includes two or more separate permanent magnet pieces each having a rectangular parallelepiped shape with a fractured surface formed when a permanent magnet block is fractured. The separate permanent magnet pieces include a first separate permanent magnet piece and a second separate permanent magnet piece. At the time when the permanent magnet block is fractured, the first and second separate permanent magnet pieces are adjacently located and a first fractured surface of the first separate permanent magnet piece and a second fractured surface of the second separate permanent magnet piece are adjacent to each other. The permanent magnet is configured such that the first fractured surface of the first separate permanent magnet piece and the second fractured surface of the second separate permanent magnet piece are located in positions out of contact with each other. | 08-02-2012 |
20120200188 | ROTOR FOR ROTARY ELECTRIC MACHINE - A plurality of magnetic poles are disposed at intervals, in a circumferential direction, at an outer periphery of a rotor core. Each magnetic pole has a pair of permanent magnets disposed spaced apart from each other in the circumferential direction, and a magnetic flux suppression hole that suppresses flow of magnetic flux and that is formed extending on the inward side in the radial direction, between inner-periphery-side end portions of each permanent magnet. The magnetic flux suppression hole is formed of two first holes respectively communicating with magnet insertion holes into which the permanent magnets are inserted, and a second hole that is formed between the first holes with bridge portions interposed therebetween. An outer-periphery-side end portion of the second hole is positioned further outward than an imaginary straight line that passes through the inner-periphery-side end portions of the pair of permanent magnets. | 08-09-2012 |
20120228977 | ROTOR-STATOR STRUCTURES WITH AN OUTER ROTOR FOR ELECTRODYNAMIC MACHINES - Various embodiments relate generally to electrodynamic machines and the like, and more particularly, to rotor assemblies and rotor-stator structures for electrodynamic machines, including, but not limited to, outer rotor assemblies and/or inner rotor assemblies. In some embodiments, a rotor-stator structure includes a rotor structure in which rotor assemblies are arranged on an axis of rotation. A rotor assembly can include an arrangement of magnetic regions each having a portion of a surface that is oriented substantially at an angle to the axis and disposed externally to, for example, a portion of a conically-shaped space centered on the axis of rotation. The rotor-stator structure also can include pole members (e.g., field pole members) having pole faces. A subset of the pole faces can be positioned to confront the arrangement of the magnetic regions to establish air gaps, with the subset of the pole faces being disposed internally to the conically-shaped space. | 09-13-2012 |
20120228978 | ROTOR-STATOR STRUCTURES INCLUDING BOOST MAGNET STRUCTURES FOR MAGNETIC REGIONS HAVING ANGLED CONFRONTING SURFACES IN ROTOR ASSEMBLIES - Various embodiments relate generally to electrodynamic machines and the like, and more particularly, to rotor assemblies and rotor-stator structures for electrodynamic machines, including, but not limited to, outer rotor assemblies and/or inner rotor assemblies with a corresponding stator assembly. In some embodiments a rotor assembly can include magnetically permeable structures having confronting surfaces oriented at an angle to the axis of rotation. A group of magnetic structures can be interleaved with the magnetically permeable structures. The magnetically permeable structures can also include non-confronting surfaces adjacent to which boost magnets are disposed to enhance flux in a flux path passing through magnetic structures that are interleaved with magnetically permeable structures. Further, the rotor assemblies can include a flux conductor shield disposed adjacent to the boost magnets, the flux conductor shield configured to provide return flux paths. | 09-13-2012 |
20120228979 | OUTER ROTOR ASSEMBLIES FOR ELECTRODYNAMIC MACHINES - Embodiments of various rotor assemblies can include an arrangement of magnetically permeable structures including confronting surfaces oriented at an angle to the centerline, and different subsets of non-confronting surfaces. Different magnets can be disposed adjacent to the different subsets of non-confronting subsets. For example, one type of magnet lies is a flux path or a flux path portion passing through one subset of non-confronting surfaces, and another type of magnet is external to the flux path adjacent to another subset of non-confronting surfaces and is configured to boost the flux associated with the flux path (or a portion thereof). In some embodiments, the magnetic region can include a portion of the internal permanent magnet. One example of a rotor assembly is an outer rotor assembly. | 09-13-2012 |
20120248917 | STATOR AND ROTOR-STATOR STRUCTURES FOR ELECTRODYNAMIC MACHINES - Embodiments of the invention relate generally to electric motors, alternators, generators and the like, and more particularly, to stator structures and rotor-stator structures for motors that can be configured to, for example, reduce detent. | 10-04-2012 |
20120256508 | PERMANENT MAGNET SYNCHRONOUS ROTATING ELECTRIC MACHINE AND ROTOR CORE - A permanent magnet synchronous rotating electric machine includes a rotor and a stator. The rotor includes a first hole, a second hole, a first magnet, and a second magnet. The second hole is provided on an opposite side with respect to a center line extending along a radial direction of the rotor. The first magnet is provided in the first hole and extends along a first longitudinal axis inclined at a first acute angle with respect to the center line. The second magnet is provided in the second hole and extends along a second longitudinal axis inclined at a second acute angle with respect to the center line. The second acute angle is smaller than the first acute angle. | 10-11-2012 |
20120313475 | HEAT DISSIPATION FAN WITH MAGNET RING OF VARYING THICKNESS - An exemplary heat dissipation fan includes a rotor and a stator. The stator includes a stator core. The rotor is rotatably mounted around the stator. The rotor includes a hub and a magnet ring received in the hub. The hub includes a top wall and a peripheral side wall depending from the top wall. The magnet ring is attached to the side wall and surrounding the stator. The magnet ring has a larger thickness as measured in a radial direction at a first end which is far away from the top wall than a second end which is adjacent to top wall, such that an attracting force formed between the first end of the magnet ring and the stator core is larger than that formed between the second end of the magnet ring and the stator core. | 12-13-2012 |
20120313476 | ROTOR OF ROTATING ELECTRICAL MACHINE - When a corner part that is most distant from a perimeter surface of a rotor core is defined as a first corner part and a corner part in a position that faces the first corner part in a magnetization direction of a permanent magnet is defined as a second corner part, a gap is formed between the second corner part and an inner circumference side of a slot, and the inner circumference side of the slot that forms the gap has an arc surface that has a point X as a center on the inner circumference side of the slot that faces the first corner part. Therefore, the demagnetizing field by the magnetic flux from the stator side does not act intensively on the second corner part of the permanent magnet, and the demagnetizing field instead affects in a wide range of the permanent magnet equally. | 12-13-2012 |
20130002081 | PERMANENT MAGNET ROTOR - A rotor for a permanent magnet brushless motor includes a shaft, a rotor core fixed to the shaft, and magnets embedded in the rotor core. The rotor core defines a plurality of spaced first slots arranged in a circumferential direction thereof, and a plurality of spaced second slots, each second slot being located between two adjacent first slots and each first slot being located between two adjacent second slots. First permanent magnets are received in the first slots and second permanent magnets are received in the second slots. Each second magnet is located between two adjacent first magnets and each first magnet is located between two adjacent second magnets in the circumferential direction, and the first magnets are magnetized in radial directions of the rotor core and the second magnets are magnetized in the circumferential direction. | 01-03-2013 |
20130038164 | SEQUENTIALLY LAMINATED, RARE EARTH, PERMANENT MAGNETS WITH DIELECTRIC LAYERS REINFORCED BY TRANSITION AND/OR DIFFUSION REACTION LAYERS - Laminated, rare earth, permanent magnets with one or more dielectric layers, suitable for use in high performance, rotating machines comprising: sequential laminates of permanent magnet layers and dielectric layers separated by transition and/or diffusion reaction layers, where said sequentially laminated magnets indicate increased electrical resistivity with improved mechanical strength. | 02-14-2013 |
20130069469 | ROTOR OF MOTOR, METHOD OF PRODUCING THE ROTOR, INNER ROTOR-TYPE BRUSHLESS MOTOR AND METHOD OF PRODUCING THE MOTOR - The rotor of the present invention is capable of improving magnetic characteristics, general versatility and ease of assembly. The rotor comprises: a rotor shaft; a ring-shaped rotor magnet being disposed coaxially with the rotor shaft; and a non-magnetic cover covering an outer circumference of the rotor magnet. The rotor magnet and the cover are integral-molded with molding resin in a state where an outer circumference of the cover is exposed and both end parts and an inner circumference of the rotor magnet are covered with the molding resin. | 03-21-2013 |
20130082561 | PERMANENT MAGNET ROTOR FOR A ROTARY ELECTRIC MACHINE - A permanent magnet rotor ( | 04-04-2013 |
20130088113 | MOTOR HAVING MORE MAGNETS ON EFFECTIVE AREA OF THE ROTOR THEREOF - A motor having more magnets on effective area of the rotor includes a stator, a rotor and a rotation shaft, the rotor has a plurality number of rotor magnetic poles, a magnet is installed inside each of rotor magnetic pole, and a concave arc is on the outer side of each magnet and forms the first, the second and the third surfaces near inside of each magnet. The concave arc connects to the first and the third surfaces with a connecting plan respectively, each connecting plan nears the periphery surface of the rotor. The motor has more magnets on the effective area of the rotor for higher motor efficiency. | 04-11-2013 |
20130088114 | INNER ROTOR-TYPE PERMANENT MAGNET MOTOR - A motor includes poles P having a remanence Mr of 0.9 T or more, a coercivity HcJ of 0.80 MA/m or more, and a maximum energy product (BH) | 04-11-2013 |
20130119807 | ROTATING ELECTRIC MACHINE ROTOR - A rotating electric machine rotor is equipped with a rotor core and a pair of permanent magnets disposed in a V-shape that opens toward an outer periphery of the rotor core. The pair of permanent magnets is separated in an inner periphery direction of the rotor core, and the rotor core contains a gap formed by connecting between at least the separated permanent magnets. | 05-16-2013 |
20130134819 | RING SHAPED RUBBER MAGNET AND SPINDLE MOTOR HAVING THE SAME - Disclosed herein is a ring shaped rubber magnet for a spindle motor formed by coupling one surface and the other surface of a sheet shaped rubber magnet to each other, wherein one surface of the sheet shaped rubber magnet has an obtuse angle of 90 degrees or more at an edge of one end portion thereof and an acute angle of 90 degrees or less at an edge of the other end portion thereof, and the other surface of the sheet shaped rubber magnet has an acute angle of 90 degrees or less at an edge of one end portion thereof and an obtuse angle of 90 degrees or more at an edge of the other end portion thereof. | 05-30-2013 |
20130147303 | MULTI-LAYER ARC-SHAPED PERMANENT MAGNET MACHINE WITH REDUCED ROTATIONAL STRESS - An interior permanent magnet machine includes a rotor configured to magnetically interact with a stator. First and second dividers are integrally formed within the rotor and configured to create a first layer of three respective first segments. Each of the respective first segments may be substantially arc-shaped. A plurality of first magnets may be positioned in the first layer. The first magnets may be substantially arc-shaped and defined around an arc center. A third and a fourth divider may be integrally formed within the rotor and configured to create a second layer of three respective second segments. The placement of dividers or structural webs provides for increased rotational speed and reduced rotational stress compared to an undivided arc-shaped magnet configuration. | 06-13-2013 |
20130169100 | PERMANENT MAGNET MOTOR AND ROTOR CORE THEREOF - A permanent magnet (PM) motor and a rotor core thereof are provided. The PM motor includes a rotor core and a stator. The stator is disposed around the rotor core, and the rotor core is disposed along a rotation axis. The rotor core includes a magnetic core and multiple groups of PMs. The rotation axis passes through the magnetic core, and the PMs are disposed in the magnetic core around the rotation axis and in pairs. Each group of PMs includes a first PM and a second PM, which are symmetrically disposed at two opposite sides of a corresponding radial plane. Each group of PMs includes a common perpendicular line perpendicularly intersecting magnetic pole lines of the group of PMs, and a first angle exists between the common perpendicular line and the rotation axis. | 07-04-2013 |
20130270957 | POLE-TO-POLE ASYMMETRY IN INTERIOR PERMANENT MAGNET MACHINES WITH ARC-SHAPED SLOTS - An interior permanent magnet machine includes a rotor formed with a plurality of slots that are substantially arc-shaped and referred to herein as arc segments. A first layer of arc segments are disposed in a first pole. The first layer defines a first configuration relative to a first arc center. A second layer of arc segments are disposed in a second pole. The second layer defines a second configuration relative to a second arc center. The rotor is configured such that the first configuration is different from the second configuration, thereby exhibiting pole-to-pole asymmetry. The first configuration is sufficiently different from the second configuration such that torque ripple may be minimized. In one embodiment, the first layer includes first, second and third arc segments. The rotor may be configured such that the second arc segment is radially offset relative to the first and third arc segments. | 10-17-2013 |
20130270958 | ROTARY ELECTRIC MACHINE - A rotary electric machine includes a stator and a rotor located in a rotatable manner relative to the stator via a gap. The stator includes a multi-phase stator winding that is held in a plurality of slots formed in the stator. The rotor includes at least one magnet section embedded therein so as to face the slots. The magnet section includes a plurality of axially laminated magnets with a skew angle which is an angle of a positional difference between the magnets. This skew angle θs is set so as to satisfy θs=kα/2 where α is a slot pitch which is an angle between the slots, and k is a coefficient set based on: an arc ratio θa being an angle covering an area in which magnetic flux radially flows from the magnetic section; and a slot factor S being a ratio of the slots relative to the magnet section. | 10-17-2013 |
20130278105 | ROTOR ASSEMBLY - Disclosed herein is a rotor assembly, including: a rotor portion provided with an insertion hole into which a rotating shaft is inserted; and a magnet inserted into an embedded hole radially formed at a cross section axially vertical to the shaft of the rotor portion outwardly from the rotor portion, wherein the magnet is formed so that a width in a direction vertical to a radial direction of the magnet gradually increases from the shaft radially outwardly from the rotor portion. According to the preferred embodiment of the present invention, more magnets can be arranged in the same area, the freedom of design can be improved, and the flux amount can be increased, by the structural change of the magnet embedded in the rotor portion. | 10-24-2013 |
20130342067 | ROTOR OF MOTOR - Disclosed is a rotor of a motor including: a cup-shaped rotor housing having a side wall portion formed along the outer peripheral surface thereof; a rotor core disposed inside the side wall portion of the rotor housing and having a plurality of U-shaped insertion grooves formed therealong; and a plurality of U-shaped magnets adapted to be inserted correspondingly into the plurality of U-shaped insertion grooves of the rotor core. | 12-26-2013 |
20140042860 | INTERIOR PERMANENT MAGNET MACHINE HAVING OFF AXIS CENTERED ARC GEOMETRY - A rotor core defines a plurality of cavities, and includes one magnet disposed within each cavity. Each magnet includes a cross section that defines an arcuate shape having an arc center. The magnets are arranged about a pole axis to define a first group of magnets disposed on a first side of the pole axis, and a second group of magnets disposed on a second side of the pole axis. The arc centers of each of the magnets of the first group of magnets and the second group of magnets are spaced from each other and are spaced from the pole axis. The plurality of magnets is arranged in a plurality of layers. The arc centers of each of the magnets in each of the layers are spaced from each other. | 02-13-2014 |
20140054999 | METHOD OF MANUFACTURING AN ELECTRIC MACHINE WITH SEGMENTED PERMANENT MAGNETS - A method for manufacturing a magnet stack for placement in a core member of a permanent magnet electric machine includes providing a plurality of magnet segments, each of the plurality of magnet segments including opposing axial faces having a first surface finish. The method further includes assembling the plurality of first magnet segments into a magnet stack, the magnet stack including a first end with a first axial face of a first magnet segment and an opposing second end with a second axial face of a second magnet segment. Additionally, the method includes finishing the opposing ends of the magnet stack such that the first axial face and the second axial face have a second surface finish that different than the first surface finish. | 02-27-2014 |
20140152139 | PERMANENT MAGNET SYNCHRONOUS MOTOR - Disclosed is a permanent magnet synchronous motor comprising a stator ( | 06-05-2014 |
20140175932 | MOTOR AND ROTOR THEREOF - Disclosed are a motor and a rotor thereof. Taking the distance between the two endpoints of a permanent magnet ( | 06-26-2014 |
20140191609 | MOTOR - A motor includes a stator having a ring type structure and including a plurality of teeth protruding toward an inner surface of the stator and coils wound around the teeth; and a rotor including a core with a plurality of permanent magnets circumferentially magnetized inside the stator around a rotation shaft and a non-magnetic member between the core and the rotation shaft, and the permanent magnet includes a protrusion protruding to the non-magnetic member. An area of the permanent magnet is increased by increasing a length of the permanent magnet so that a magnetic flux can be increased to increase a torque. | 07-10-2014 |
20140197708 | ROTATING ELECTRICAL MACHINE - A rotating electrical machine comprising an armature; a yoke; and a plurality of magnets arrayed in a ring shape along an inner peripheral face of the yoke. The magnets are respectively formed in circular arc shapes fit with the inner peripheral face of the yoke, and are fixed to the yoke. The magnets are arrayed along the circumferential direction of the yoke with gaps between each other, a central portion in a circumferential direction of each of the magnets is disposed so as to be opposed in a yoke diameter direction to the gap between other magnets arrayed adjacent to each other, a boundary portion between a pair of magnetic poles in each of the magnets is positioned at central position in the circumferential direction of each of the magnets, and each of the magnets is formed thicker at end portions than at the central portion in the circumferential direction thereof. | 07-17-2014 |
20140217847 | BRUSHLESS PERMANENT MAGNET MOTOR - A brushless permanent magnet electric motor ( | 08-07-2014 |
20140239765 | PERMANENT MAGNET SYNCHRONOUS MOTOR HAVING A LOW DEMAGNETIZATION FACTOR - To obtain a permanent magnet synchronous motor suitable for an electric power steering system, in which the magnet thickness (magnet used amount) can be reduced while securing demagnetization resistance and torque characteristics. In a permanent magnet synchronous motor including a rotor in which plural permanent magnets are arranged at an outer periphery of a rotor core, which is supported so as to rotate freely, and a stator provided at the outside of the stator and having stator windings | 08-28-2014 |
20140265701 | ROTARY ELECTRIC MACHINE - A rotary electric machine includes: a rotor core in which one or more permanent magnets are provided; and a stator core disposed radially opposite to the rotor core, a plurality of slots being provided in the stator core. Coils are disposed in the slots of the stator core. Further, the number q of slots per pole per phase, which is a value obtained by dividing the number Ns of the slots by the number P of poles of the permanent magnets and the number m of phases of a voltage induced in the coils, is a fraction having an odd denominator and an even numerator, and slot vectors which are electrical phases of the coils disposed in the slots are made to have unequal slot vector pitch angles in which pitches between the slots are unequal. | 09-18-2014 |
20140265702 | Electric Machine with Skewed Permanent Magnet Arrangement - A permanent magnet electric machine includes a stator and a rotor opposing the stator. Axial slots are provided in the rotor with a plurality of magnet stacks positioned in the slots. Each of the plurality of magnet stacks includes a plurality of magnet segments. The plurality of magnet segments includes a first number of first magnet segments and a second number of second magnet segments. The first magnet segments are offset from the second magnet segments in a circumferential direction of the rotor. The first number and the second number are both greater than one and the first number is different from the second number. | 09-18-2014 |
20140265703 | MOTOR AND ROTOR - A motor including a stator and a rotor. The stator includes teeth and windings. Each tooth has a distal portion defined by a radially inward side of the stator. The rotor, which is arranged inward in the radial direction from the stator, includes a rotor core, magnets, and salient poles. Each salient pole is separated by a void from the magnet that is adjacent in the circumferential direction. The distal portion of each tooth is longer than a radially outward side of each magnet. | 09-18-2014 |
20140265704 | ROTOR INCLUDING PERMANENT MAGNETS HAVING DIFFERENT THICKNESSES AND MOTOR INCLUDING SAME - The present invention relates to a rotor including permanent magnets having different thicknesses and to a motor including the same. In the rotor, the permanent magnets having different thicknesses at both ends thereof are inserted into the iron core of the rotor to solve the imbalance of gap flux density. According to the present invention, the motor includes a rotor and a stator having a rotor insertion hole in which the rotor is inserted in the center thereof, wherein a coil is wound around the inner circumferential surface of the rotor insertion hole. Here, the rotor includes a rotor iron core and a plurality of permanent magnets. The rotor iron core has a rotating shaft insertion hole in which a rotating shaft is inserted in the center thereof, and a plurality of permanent magnet insertion holes are defined in the circumference of the rotating shaft insertion hole. | 09-18-2014 |
20140265705 | ROTOR AND INTERIOR PERMANENT MAGNET MOTOR - A rotor, constituting an interior permanent magnet motor, includes magnets that are inserted into the rotor, and a rotor core containing magnet insertion pockets to which the magnets are inserted, and, when the magnets are inserted, the magnet insertion pockets are formed to provide openings in areas except both ends of an inner circumferential face, at both ends in a circumferential direction of the magnets. | 09-18-2014 |
20140339945 | SEGMENTED MAGNET COMPONENT FOR ELECTRIC MACHINE AND METHOD OF ASSEMBLY - A component includes magnet elements adjoined to each other to form an arced segmented magnet section that is configured to fit in an a curved rotor slot gap of an electric machine. An electric machine that employs the component and method of assembly of the component are also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims. | 11-20-2014 |
20140354103 | MOTOR - A motor includes a stator including stator cores and coils wound on the stator cores, a rotor disposed at the inside of the stator and rotated by electromagnetic interaction with the stator, and a motor shaft combined with the rotor so as to be rotated together with the rotor. The rotor includes a plurality of rotor cores arranged to be separated from each other in the circumferential direction of the rotor, a plurality of rotor slots formed between the plurality of rotor cores, a plurality of permanent magnets inserted into the plurality of rotor slots, and a plurality of cover members connecting neighboring rotor cores to close one opened side of each of the plurality of rotor slots. | 12-04-2014 |
20140361656 | ROTOR FOR A ROTATING ELECTRIC MACHINE AND ROTATING ELECTRICAL MACHINE COMPRISING SUCH A ROTOR - The rotor comprises of a plurality of alternating north poles (N) and south poles (S) formed from a plurality of permanent magnets ( | 12-11-2014 |
20140368074 | MOTOR INCLUDING FLEXIBLE PRINTED CIRCUIT BOARD STATOR - A motor having a compact and lightweight design may include a stator provided by a flexible printed circuit (flex circuit). The flex circuit may include a plurality of etched windings that provide coils for a plurality of motor phases. A printed circuit board of the motor may provide various device functions such as electrical commutation. The motor may be used in various applications such as a cooling fan for device electronics and gyroscopic applications. | 12-18-2014 |
20150076950 | ROTOR FOR MAGNETIC ROTATING ELECTRICAL MACHINE, PRODUCTION METHOD FOR SAME, AND DEVICE - A method of manufacturing a rotor for a magnet type rotating electrical machine includes the steps of: cutting and laminating pieces of the core of the rotor, to thereby form a core ( | 03-19-2015 |
20150091406 | PERMANENT MAGNET MOTOR - A permanent magnet motor includes a P-pole-implanted permanent magnet rotator containing a ferrite magnet in a laminated silicon steel sheet, wherein, at one pole, a U-shaped permanent magnet comprising three parts, and, at the outer periphery of the U-shaped magnet, one outer-periphery permanent magnet disposed longitudinally in the peripheral direction are provided to generate permanent magnet torque. At one pole, the permanent magnet rotator generates reluctance torque using two salient poles formed between the U-shaped permanent magnet and the outer-periphery permanent magnet. One central salient pole is formed between the adjacent poles. A stator comprises an M-phase stator winding that is a distributed winding, and a stator core having Ns slots. The ratio of Ns/P/M is a common fraction. When the width of the center salient pole is set to τcp and the slot pitch of the stator core is set to τs, τcp is smaller than τs. | 04-02-2015 |
20150091407 | EMBEDDED PERMANENT MAGNET ROTARY ELECTRIC MACHINE - Permanent magnets that constitute the single magnetic poles are constituted by n permanent magnet segments, the n permanent magnet segments being configured such that shapes and directions of orientation thereof have mirror symmetry relative to a plane that passes through a magnetic pole center and that includes a central axis of the rotor core, and being oriented such that a permanent magnet segment that is further away from the magnetic pole center in a circumferential direction has a smaller angle of orientation, and the permanent magnet segment that is positioned further away from the magnetic pole center in the circumferential direction being produced so as to have an approximately fan-shaped cross-sectional shape in which a radial width is wider than a circumferential width. | 04-02-2015 |
20150303749 | ROTOR OF MAGNET-ASSISTED RELUCTANCE MOTOR AND BRUSHLESS MOTOR - A rotor includes S-pole and N-pole magnets which are arc-shaped in cross-section. Each pole has three magnets. Each magnet is embedded in the rotor in such a way that a convex side portion thereof faces center Or of the rotor. Distance Rs between center Os of circular arcs of S-pole magnets and center Or of the rotor is different from distance Rn between center On of circular arcs of N-pole magnets and center Or of the rotor (Rs≠Rn). The ratio of the two distances is 0.92 (Rs/Rn=0.92). An outer peripheral section of an innermost-layer S-pole magnet is disposed in such a way as to protrude into an adjacent pole zone N | 10-22-2015 |
20150318743 | PERMANENT MAGNET-EMBEDDED ELECTRIC MOTOR - An interior permanent magnet motor capable of increasing an output of a motor without reducing torque by increasing demagnetization resistance. The interior permanent magnet motor includes a rotator including a rotator core, and a stator. The rotator core includes a plurality of magnet accommodating holes and a plurality of permanent magnets. The thickness in the short-side direction of each of the magnet accommodating holes is minimum at the center portion of the magnetic pole, and is gradually increased toward the radially outer side of the rotator core. At least the thickness in the short-side direction of the permanent magnet at the center portion of the magnetic pole is equal to the thickness in the short-side direction of the magnet accommodating hole at the center portion of the magnetic pole. | 11-05-2015 |
20150326080 | ROTOR AND MOTOR - A rotor includes: a circular rotor core; and a plurality of θ magnets. The θ magnets are contained in a magnet holding sections such that the same magnetic pole of one magnet as that of another magnet adjacent to said one magnet faces the same magnet pole of the adjacent magnet in circumferential directions of the rotor core. Given that the number of magnetic poles of the rotor is denoted by P, the maximum outside diameter of the rotor core is denoted by Dr [mm], and the thickness of the plate-like magnet in a circumferential direction of the rotor core is denoted by Lm [mm], the following inequality (2) is satisfied: | 11-12-2015 |
20160013689 | ROTOR AND MOTOR | 01-14-2016 |
20160043620 | Brushless Direct Current Motor and Rotor Thereof - A BLDC motor includes a stator and a rotor. The rotor includes a shaft, first and second end plates, a plurality of cores arranged between the first and second end plates, a plurality of magnets, and a housing. The cores are evenly spaced from each other in the circumferential direction. A space is formed between neighboring cores. Each space receives one magnet. The magnets are magnetized circumferentially such that side surfaces of the magnets have corresponding polarities. The housing is made of magnetically permeable material, surrounding and covering radially outer ends of the magnets and cores. | 02-11-2016 |
20160065015 | MAGNETIC PLATE USED FOR ROTOR CORE OF MOTOR AND METHOD FOR MANUFACTURING MAGNETIC PLATE - A magnet plate used for a rotor core of a motor, includes a magnetic pole portion being set between an outer peripheral edge of a body portion and a magnet slot and having a radial width being smaller than a radial sectional width of the permanent magnet, and a higher hardness portion being formed into a hook shape along an end corner of the magnet slot and have a smaller width than the radial sectional width of the permanent magnet. | 03-03-2016 |
20160072353 | Electric Generator - A simpler to manufacture electrical machine generator or motor designed to be built of 2 dimensionally cut flat stock materials with special utility as a larger than conventional diameter electric generator that is designed to operate at lower revolutions per minute than conventional generators so as to be able to be driven by human legs or arms or wind generation at low wind speeds, or water movement at low or zero water drop distance or ‘head’ or other applications. | 03-10-2016 |
20160079816 | ROTOR OF A BRUSHLESS MOTOR - A brushless motor includes a stator disposed along an axis and a rotor disposed radially inward from the stator. The rotor includes a core, a plurality of first magnets and a plurality of second magnets configured to have opposite poles relative to the plurality of first magnets. The plurality of first and second magnets may each have a substantially rectangular cross-section and are in contact with a substantially flat surface carried by the core that faces radially outward. | 03-17-2016 |
20160126818 | SYNCHRONOUS ELECTRIC MOTOR WITH PERMANENT MAGNETS - A synchronous electric motor with permanent magnets ( | 05-05-2016 |
20160172915 | PERMANENTLY MAGNETICALLY EXCITED ELECTRIC MACHINE | 06-16-2016 |
20160254713 | PERMANENT MAGNET ROTARY ELECTRIC MACHINE | 09-01-2016 |