Patent application number | Description | Published |
20080203842 | MOTOR - A motor includes a stator formed of a stator iron-core having salient pole iron-cores and windings, and a rotor having a rotor iron-core in which permanent magnets are buried. A magnetic pole centerline connecting a rotary center of the rotor to a magnetic pole center crosses an external shape of the rotor iron-core at end point X, and the magnetic-pole boundary line connecting the rotary center to a magnetic pole boundary point crosses the external shape of the rotor iron-core at end point Z. A straight line angled at a given angle θa from the magnetic pole centerline has end point A. Then a sectional view of the rotor iron-core shows an arc drawn between the end points X and A, and the arc's center is the rotary center. The end points A and Z are connected by one or more than one straight lines in series. | 08-28-2008 |
20090009019 | ELECTRIC MOTOR - Having a stator core including a yoke, a plurality of inside teeth, and a plurality of outside teeth, an inside rotor, and an output rotor, the inside slot open angle/inside pole angle and the outside slot open angle/outside pole angle are determined so that the inside cogging torque due to rotation of the inside rotor and the outside cogging torque due to rotation of the outside rotor may cancel each other in inverted phases. Plural combinations are provided so that the amplitude of inside cogging torque and the amplitude of outside cogging torque due to rotation of outside rotor maybe approximate values in inverted phase, and the combination of the highest combined voltage value of the both induced voltage is selected. | 01-08-2009 |
20090072650 | MOTOR - A motor includes a stator with an annular stator yoke, a stator core having a plurality of inner and outer teeth projecting from the stator yoke toward inside and outside respectively, a plurality of coils wound on the stator core, and an inner rotor and an outer rotor confronting the inner and outer teeth respectively via an air-gap, and having an permanent magnet respectively. The number of slots “S” and the number of poles “P” establish a relation of S:P=3:2N−1, where N is an integer equal to 1 or more, and a case when 2N−1 becomes a multiple of 3 is excluded. | 03-19-2009 |
20090091204 | MOTOR HAVING TWIN-ROTOR - A motor includes a stator, a first rotor and a second rotor. The stator has a plurality of outer teeth projecting outward from an annular stator yoke, a plurality of inner teeth projecting inward from the stator yoke, and windings wound on both of the teeth. Instead of providing both of the teeth with the windings, toroidal windings can be wound on the stator yoke at each section sandwiched between the slots, which stator yoke is disposed between each one of the inner slots and corresponding each one of the outer slots. This motor is structured such that the phases of cogging torque and torque ripple existing between the stator and the second rotor can be reversed with respect to the phases of cogging torque and torque ripple existing between the stator and the first rotor. | 04-09-2009 |
20090134735 | MOTOR HAVING TWIN-ROTOR AND APPARATUS HAVING THE SAME - A motor includes a stator which includes a stator core having an annular stator yoke, a plurality of outer teeth projecting outward from the stator yoke and a plurality of inner teeth projecting inward from the stator yoke, and a plurality of windings wound on the stator core. The motor also includes an outer rotor confronting the outer teeth with an air gap therebetween and an inner rotor confronting the inner teeth with an air gap therebetween. This motor thus has twin-rotor. The stator core includes outer slots between each one of the outer teeth as well as inner slots between each one of the inner teeth, and the windings are wound on the stator yoke between the outer slot and the inner slot. A cross sectional cut of the stator reveals that a sectional area of the outer slot is equal to that of the inner slot. | 05-28-2009 |
20090134738 | MOTOR AND APPARATUS EMPLOYING THE SAME - In a stator core having “N” slots, a tooth-width centerline of a linear yoke and a first extension line extended horizontally from a center of rotary shaft toward the linear yoke form a first angle. Assume there are first point on the first extension line at a first distance from the center, a second extension line drawn at a second distance horizontally from the center toward the linear yoke and extended vertically toward arc-shaped yokes, and a third extension line drawn from the center toward teeth ends of the linear yokes with angle “K”. The second and third extension line intersect at a second point. A line between the first and second points intersects with the first extension line, thereby forming the first angle. In this structure, 0 | 05-28-2009 |
20090302719 | BRUSHLESS MOTOR - A Hall element is placed under an outside rotor at an identical angular position to a centerline between two adjacent outer teeth. This structure allows narrowing a dead band of the Hall element when it senses a leakage magnetic flux. | 12-10-2009 |
20100045131 | ELECTRIC MOTOR - It comprises stator including stator core having yoke and a plurality of teeth protruded from yoke, which is formed with slots between adjacent teeth, and rotor having rotor core and permanent magnet formed with a plurality of magnetic poles, which confronts tip ends of teeth via gaps, wherein rotor core is formed by rotor core materials circumferentially equally divided into the predetermined number of divisions, and the least common multiple being N for the number of slots and the number of magnetic poles and the least common multiple being M for the number of slots and the number of divisions, then N is equal to M. | 02-25-2010 |
20100058817 | DRUM TYPE WASHING MACHINE - A drum type washing machine of the present invention is a direct-drive washing machine including a washing-machine casing; a rotating drum with its drum rotation shaft horizontal or inclined; and a motor driving the rotating drum. The motor has a stator including a coil wound in a toroidal winding form and first molding resin; and a twin-type rotor including an outer rotor, an inner rotor, and second molding resin integrally molding them. | 03-11-2010 |
20100226802 | FAN MOTOR AND BLOWER INCLUDING THE SAME MOTOR - A fan motor includes a pair of fans axially mounted to both sides of a rotary shaft of the motor. The motor includes an inner rotor placed inside a stator wound with windings and an outer rotor placed outside the stator. The motor thus has a dual-rotor structure where the inner rotor and the outer rotor are held such that both the rotors can rotate on the rotary shaft. | 09-09-2010 |
20100237752 | MOTOR AND ELECTRONIC DEVICE USING THE SAME - This motor includes a stator whereupon a plurality of magnetic poles are arranged at first prescribed intervals on the outer circumference section, and a rotor which is rotatively arranged on the outer circumference of the stator by having a prescribed space in between and has permanent magnets magnetized to different polarities at second prescribed intervals. The magnetic pole of the stator forms an extending section which extends from a magnetic pole base section in a direction parallel to the permanent magnet, and the extending length of the extending section in the direction parallel to the permanent magnet is same as that of the magnetic pole base section in the direction parallel to the permanent magnet or shorter. | 09-23-2010 |
20100244616 | DUAL-ROTOR MOTOR - A dual-rotor motor in which inner slot angle φi is larger than outer slot angle φo. An inner notched portion is provided on both circumferential ends of an inner head. This inner notched portion provides a broader space between the inner head and an inner rotor toward both utmost ends of the inner head. An outer notched portion is provided on both circumferential ends of an outer head. This outer notched portion provides a broader space between the outer head and the outer rotor toward both utmost ends of the outer head. | 09-30-2010 |
20100244637 | MOTOR AND ELECTRONIC DEVICE USING SAME - A motor comprises a stator having a plurality of magnetic poles disposed at first predetermined intervals along an outer periphery thereof, and a rotor having a permanent magnet with poles magnetized alternately to have different polarities at second predetermined intervals and disposed rotatably around the outer periphery of the stator with a predetermined gap. The magnetic poles of the stator has extended portions formed in a manner to extend from magnetic polar bases into a direction generally parallel to the permanent magnet, and the extended portions are formed of a high-permeability magnetic steel sheet with silicon content less than 3.0 wt-%. | 09-30-2010 |
20100259126 | MOTOR AND ELECTRONIC DEVICE COMPRISING THE SAME - A motor comprising a stator having a plurality of magnetic poles disposed in a circumferential direction along an outer periphery thereof, a rotor disposed rotatably around the outer periphery of the stator, and a magnet disposed in a circumferential direction along an inner periphery of the rotor. The stator is formed by laminating sheet-like plates. A plurality of the sheet-like plates including an outermost layer of this laminated body comprises a flat portion substantially perpendicular to the magnet, and an extended portion bent to a direction substantially parallel to the magnet. A part of the sheet-like plate having the extended portion disposed to the outermost side is formed into a thickness smaller than thicknesses of the other parts. | 10-14-2010 |
20100295401 | MOTOR AND DEVICE USING THE SAME - A motor includes a stator which includes: a stator core having an annular stator yoke, a plurality of outer teeth projecting outward from the stator yoke, and a plurality of inner teeth having the same number of teeth as the outer teeth and projecting inward from the stator yoke; and a plurality of windings wound on the stator core, and the motor includes an outer rotor confronting the outer teeth via an air gap and an inner rotor confronting the inner teeth via an air gap. The outer rotor and the inner rotor have holes for accommodating permanent magnets respectively. The permanent magnets having a rectangular shape in sectional views thereof are accommodated in the holes. | 11-25-2010 |
20100314965 | MOTOR AND ELECTRONIC APPARATUS USING THE SAME | 12-16-2010 |
20100327691 | MOTOR AND ELECTRONIC APPARATUS USING THE SAME | 12-30-2010 |
20100327692 | MOTOR AND ELECTRONIC APPARATUS USING THE SAME | 12-30-2010 |
20110001386 | MOTOR AND ELECTRONIC APPARATUS USING THE SAME | 01-06-2011 |
20110006620 | MOTOR AND ELECTRONIC APPARATUS USING THE SAME | 01-13-2011 |
20110012465 | INTERIOR PERMANENT MAGNET ROTOR, ELECTRIC MOTOR USING THE SAME AND ELECTRIC DEVICE | 01-20-2011 |
20110018382 | STATOR AND ELECTRICAL APPARATUS - A plurality of stator teeth | 01-27-2011 |
20110050022 | PERMANENT MAGNET BURIED TYPE ELECTRIC MOTOR - Supposing a straight line joining rotation center O of a rotor and a magnetic pole middle, that is, a middle of permanent magnets ( | 03-03-2011 |
20110175497 | MOTOR AND ELECTRONIC APPARATUS USING THE SAME - The motor comprises a stator, a rotor, and magnets. The stator has a plurality of magnetic poles circumferentially arranged at first spaced intervals. The rotor is rotatably arranged in a position opposing to the stator. The magnets are arranged at second spaced intervals circumferentially on a surface of the rotor. The stator is formed by laminating plate materials, and a plurality of laminated plate materials at least including outermost layers of a laminated body thereof are bent in a direction substantially parallel to the magnet in order to form extended portions. And, when a magnet opposed area of pole tip portion being closest to a magnet including the extended portion is S, and a sectional area of magnetic pole is A, then area ratio (S/A) fulfills the relation of 4.8>(S/A). | 07-21-2011 |
20110187222 | DUAL-ROTOR MOTOR AND METHOD OF MANUFACTURING THE SAME - A dual-rotor motor provided with a stator having a stator core including a yoke, a plurality of teeth and a coil wound around the stator core, an inner rotor and an outer rotor, wherein the stator core includes an annular yoke component forming the yoke, and a plurality of tooth components forming the teeth. The stator core is made by fitting the tooth components individually into the annular yoke component in a manner that one ends of the tooth components protrude from the inner peripheral side of the annular yoke component and the other ends protrude from the outer peripheral side of the annular yoke component. | 08-04-2011 |
20120126651 | ELECTRIC MOTOR - It comprises stator including stator core having yoke and a plurality of teeth protruded from yoke, which is formed with slots between adjacent teeth, and rotor having rotor core and permanent magnet formed with a plurality of magnetic poles, which confronts tip ends of teeth via gaps, wherein rotor core is formed by rotor core materials circumferentially equally divided into the predetermined number of divisions, and the least common multiple being N for the number of slots and the number of magnetic poles and the least common multiple being M for the number of slots and the number of divisions, then N is equal to M. | 05-24-2012 |
20120286616 | MOTOR - A clutch mechanism moving together with an actuator allows coupling or decoupling an inner rotor to or from a power shaft, thereby controlling a rotation angle. This structure allows a polarity of a magnetic pole of the inner rotor to be the same as that of an opposing magnetic pole of an outer rotor when the motor is driven at a low rpm, so that magnetic fluxes inter-linking with windings can be increased, which results in greater torque. When the motor is driven at a high rpm, the structure allows the polarity of the magnetic pole of the inner rotor to be different from that of the opposing magnetic pole of the outer rotor, so that an amount of leakage flux is increased, and the magnetic fluxes inter-linking with the winding are decreased. As a result, an induction voltage is lowered and a high rpm range is widened. | 11-15-2012 |
20130043864 | WINDING METHOD AND WINDING STRUCTURE OF STATOR FOR ROTATION DETECTOR, AND ELECTRIC MOTOR COMPRISING ROTATION DETECTOR | 02-21-2013 |
20130076195 | MOTOR AND ELECTRICAL APPARATUS HOUSING SAME - A motor of this invention comprises a rotor having a permanent magnet, the number of which magnet poles is P, and a stator including M pcs of teeth, the teeth arranged in a circumferential direction in a manner to face the permanent magnet through a spatial gap, wherein the stator includes stator core having the number M of the teeth, and a winding wire wound about each of the tooth, wherein the number P of the magnet poles and the number M of the teeth have a relation defined by formulae (2/3)M | 03-28-2013 |
20130088127 | METHOD AND STRUCTURE OF WINDING OF STATOR FOR ROTATION DETECTOR, AND ELECTRIC MOTOR COMPRISING ROTATION DETECTOR | 04-11-2013 |
20130119835 | MOTOR AND ELECTRONIC DEVICE COMPRISING THE SAME - A motor comprising a stator having a plurality of magnetic poles disposed in a circumferential direction along an outer periphery thereof, a rotor disposed rotatably around the outer periphery of the stator, and a magnet disposed in a circumferential direction along an inner periphery of the rotor. The stator is formed by laminating sheet-like plates. A plurality of the sheet-like plates including an outermost layer of this laminated body comprises a flat portion substantially perpendicular to the magnet, and an extended portion bent to a direction substantially parallel to the magnet. A part of the sheet-like plate having the extended portion disposed to the outermost side is formed into a thickness smaller than thicknesses of the other parts. | 05-16-2013 |
20130313933 | ROTOR OF MOTOR AND FAN DRIVING MOTOR INCLUDING ROTOR - Provided are a rotor of a motor capable of attaining a high-speed rotation by appropriately dispersing a stress exerted on a flux barrier portion while reducing a leakage of magnetic flux, and a fan driving motor including the rotor. A second inner wall surface is greater than a first inner wall surface in length in a cross-section perpendicular to a rotational axis (C). A side wall surface has a flux barrier wall surface extending from each of both ends of the second inner wall surface in the cross-section perpendicular to the rotational axis (C), the flux barrier wall surface extending outward relative to the second inner wall surface in an extending direction of the second inner wall surface and more distant from an outer edge of a rotor as it goes from the second inner wall surface toward the first inner wall surface in the cross-section perpendicular to the rotational axis (C). | 11-28-2013 |
20130313934 | ROTOR OF MOTOR AND FAN DRIVING MOTOR INCLUDING ROTOR - Provided are a rotor of a motor capable of attaining a high-speed rotation by appropriately dispersing a stress exerted on a flux barrier portion while reducing a leakage of magnetic flux, and a fan driving motor including the rotor. A second inner wall surface is greater than a first inner wall surface in length in a cross-section perpendicular to a rotational axis (C). A side wall surface has a flux barrier wall surface extending from each of both ends of the second inner wall surface in the cross-section perpendicular to the rotational axis (C), the flux barrier wall surface extending outward relative to the second inner wall surface in an extending direction of the second inner wall surface and more distant from an outer edge of a rotor as it goes from the second inner wall surface toward the first inner wall surface in the cross-section perpendicular to the rotational axis (C). The permanent magnets are placed such that radially outward polarities of two or more permanent magnets adjacent in the circumferential direction of the rotor are the same in a state in which the permanent magnets are inserted into the slots, respectively. | 11-28-2013 |
20130342068 | MOTOR AND ELECTRIC EQUIPMENT USING SAME - A plurality of protruding portions each having a predetermined width in a circumferential direction are respectively provided at a predetermined interval along an outer periphery of a stator, and through-holes are formed at both ends in the circumferential direction of the protruding portions. A total length of the widths, which the protruding portions respectively have, in the circumferential direction is set equal to or less than 25% of an outer circumference of the stator. With this structure and by virtue of the through-holes, a compressive stress built up in an inner periphery of the stator due to pressing forces imposed on center areas of the protruding portions can be distribute toward the outer periphery of the stator. | 12-26-2013 |
20130342070 | STATOR OF MOTOR AND MOTOR - Provided is a stator of a motor which is capable of reducing an iron loss generated in a motor and thereby attaining a high-efficient motor. A stator of a motor comprises a yoke of a tubular shape; and teeth each of which includes an extending portion extending inward in a radial direction of the yoke from the yoke and an increased-width portion formed at a tip end of the extending portion so as to have a greater width than the extending portion in a circumferential direction of the yoke; wherein the extending portion has a narrower portion having a smaller width than a remaining portion of the extending portion. | 12-26-2013 |
20140001906 | BRUSHLESS MOTOR AND ELECTRIC DEVICE MOUNTED WITH SAME | 01-02-2014 |
20140055001 | STATOR OF MOTOR AND MOTOR - Provided is a stator of a motor which is capable of reducing a loss generated in a motor and thereby attaining a high-efficient motor, and a motor including the stator. A stator of a motor comprises a stator core ( | 02-27-2014 |
20140184015 | STATOR OF MOTOR AND MOTOR - A stator of a motor comprises a stator core including a plurality of plate members stacked together; the stator core including: a yoke of a tubular shape; and teeth each of which includes an extending portion extending inward in a radial direction of the yoke from the yoke and an increased-width portion formed at a tip end of the extending portion so as to have a greater width than the extending portion in a circumferential direction of the yoke; wherein the extending portion has a constant-width portion extending radially in a straight-line shape so as to have a constant circumferential width, a narrower portion having a circumferential width smaller than a circumferential width of the constant-width portion, and a clamp portion for securing the plurality of plate members to each other; and wherein at least a portion of the clamp portion is located in the narrower portion. | 07-03-2014 |
20140300235 | ROTOR OF MOTOR AND MOTOR COMPRISING ROTOR - A rotor of a motor comprises a plurality of magnetic-pole sections including: a plurality of slots which are formed inside of a rotor core; and permanent magnets, at least one of which is inserted into each of the plurality of slots; wherein each of the magnetic-pole sections is formed to correspond to the at least one permanent magnet; and wherein the rotor core includes hollow portions formed by cutting portions of the rotor core which portions are between the magnetic-pole sections which are adjacent in the circumferential direction of the rotor core and are different in polarity such that portions of circumferential end portions of the permanent magnet are exposed, and extending portions each of which is formed in a position corresponding to the hollow portions and extends radially outward from a center portion of the rotor core. | 10-09-2014 |