| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 310156430 | Specific magnetization | 60 |
| 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 |
| 20100109468 | PERMANENT MAGNET MOTOR AND METHOD FOR MANUFACTURING SAME - A permanent magnet motor includes: a rotor and a stator; and a plurality of permanent magnets placed on either the rotor or the stator. Each permanent magnet is an R—Fe—B based rare-earth sintered magnet including a light rare-earth element RL (at least one of Nd and Pr) as a major rare-earth element R, and partially includes a high coercivity portion in which a heavy rare-earth element RH (at least one element selected from the group consisting of Dy, Ho and Tb) is diffused in a relatively higher concentration than in the other portion. | 05-06-2010 |
| 20130049513 | ELECTRIC MACHINE - A permanent magnet machine includes a stator having a stator core, a plurality of stator teeth and plurality of stator windings coupled to the stator core. The stator is configured to generate a stator magnetic rotating field when the stator windings are excited with an electric current. The stator magnetic rotating field includes both synchronous sub-harmonic and super-harmonic components. The permanent magnet machine also includes a rotor that is disposed within the stator. The rotor includes a rotor core and a plurality of rotor magnets that are coupled to the rotor core. The rotor magnets are further configured to have a predefined orientation profile such that when the stator windings are excited with an electric current, sub-harmonic and super-harmonic magnetic rotating fields are generated in the rotor magnetic field. The stator sub-harmonic and super-harmonic magnetic rotating fields interact with the rotor sub-harmonic and super-harmonic magnetic rotating fields and produce an aiding torque on in the permanent magnet machine. | 02-28-2013 |
| 20130062985 | BRUSHLESS DC MOTOR - A brushless DC motor including a rotor capable of minimizing demagnetization of a magnet even when a short-circuit brake operation is performed by short-circuiting motor coils includes two kinds magnets differing in coercive force from each other which are alternately arranged into an annular shape along a circumferential direction. A magnet having a high coercive force is arranged in the portion where a diamagnetic flux is strongly generated. The portion where a diamagnetic flux is generated is the salient pole portion of a stator. A counter electromotive force becomes greatest when the center of the salient pole portion of the stator comes closer to the border of an N-pole and an S-pole of the magnet. Since the diamagnetic flux has a maximum value in that position, the magnet having a high coercive force is arranged near the border of an N-pole and an S-pole. | 03-14-2013 |
| 20090236923 | PERMANENT-MAGNET-TYPE ROTATING ELECTRICAL MACHINE - An object of the present invention is to provide a permanent-magnet-type rotating electrical machine capable of realizing a variable-speed operation at high output in a wide range from low speed to high speed and improving efficiency and reliability. The permanent-magnet-type rotating electrical machine of the present invention includes a stator provided with a coil and a rotor in which there are arranged a low-coercive-force permanent magnet whose coercive force is of such a level that a magnetic field created by a current of the stator coil may irreversibly change the flux density of the magnet and a high-coercive-force permanent magnet whose coercive force is equal to or larger than twice that of the low-coercive-force permanent magnet. At the time of high-speed rotation with a voltage of the permanent-magnet-type rotating electrical machine being around or over a power source maximum voltage, the low-coercive-force permanent magnet is magnetized with a magnetic field created by a current in such a way as to decrease total linkage flux of the low- and high-coercive-force permanent magnets, thereby adjusting a total linkage flux amount. | 09-24-2009 |
| 20130119809 | BRUSHLESS DC MOTORIZATION APPARATUS - A direct-drive brushless DC motorization apparatus comprises an outer rotor with poles constructed with segments of permanent magnet material alternatively magnetized north and south. The outer rotor is adapted to be part of a wheel and rotating with the wheel about an axis thereof. A stator core of ferromagnetic material is spaced inwardly of said rotor to define a clearance gap with the rotor such that the rotor is rotatable about the stator core. The stator core has forty-two slots and defines teeth therebetween. A three-phase winding with coils of insulated wire is wound around the teeth of the stator core. The three-phase winding is divided in two sets of consecutive teeth for each of the three phases, with each of the two sets of a same phase being diametrically opposed in the stator core. | 05-16-2013 |
| 20130119808 | MOTOR - A rotary unit of a motor includes a shaft, a ring-shaped plate, a rotor core defined by a plurality of core pieces, and a plurality of magnets arranged along the circumferential direction. The core pieces and the magnets are alternately arranged in the circumferential direction. The ring-shaped plate and the respective core pieces are fixed to each other by combining the recesses provided in one of the ring-shaped plate and the respective core pieces and the protrusions provided in the other of the ring-shaped plate and the respective core pieces or combining a first through-hole provided in the ring-shaped plate and a protrusion provided in each of the core pieces. The core pieces are fixed to the ring-shaped plate without having to provide a through-hole in each of the core pieces. This reduces a magnetic resistance of each of the core pieces. | 05-16-2013 |
| 20090079286 | Apparatus for driving drum of washing machine - A radial core type double rotor brushless direct-current motor is provided in which a double rotor structure is employed with inner and outer rotors which are doubly disposed and thus a stator core is completely divided. The motor includes a rotational shaft which is rotatably mounted on a housing of an apparatus, cylindrical inner and outer yokes which are rotatably mounted on the center of the housing, inner and outer rotors including a number of magnets which are mounted with the opposing polarities on the outer surface of the inner yoke and the inner surface of the outer yoke, and a number of cores assemblies which are installed between the inner and outer rotors in which a number of coils are wound around a number of division type cores, respectively. | 03-26-2009 |
| 20100171385 | ROTOR OF PERMANENT-MAGNET-TYPE ROTATING ELECTRICAL MACHINE - A rotor of a permanent-magnet-type rotating electrical machine of the present invention has a plurality of magnetic poles in point symmetry with respect to a rotation center of a rotor core | 07-08-2010 |
| 20100171384 | ELECTRO-MAGNETIC MOTOR GENERATOR SYSTEM - An electro-magnetic motor-generator system, comprising a wheel assembly having a wheel mounted onto a shaft. The shaft has a sleeve mounted thereon. A frame assembly is mounted onto the sleeve. The frame assembly comprises at least one hub having a sprocket. A gear assembly comprises a second sprocket mounted onto the shaft. The second sprocket engages the sprocket. A rotating ring assembly has first and second walls. The first wall comprises first gear teeth and the second wall comprises second gear teeth. The ring assembly further has consecutive magnetized/non-magnetized sections. The electro-magnetic means consist of at least one coil, and the at least one coil having first and second openings. Electro-magnetic means generate an electromotive force between said first and second openings, and said consecutive magnetized/non-magnetized sections. Switching said magnetic polarity forces said rotating ring assembly to rotate upon said sprocket thus rotating said wheel mounted onto said shaft. | 07-08-2010 |
| 20090278416 | MOTOR AND COMPRESSOR - Two magnets in a circumferential direction of a rotor are provided in each slot of the rotor. The two magnets are consistently pulled in a direction in which they are mutually separated by magnetism of a stator and fixed on inner surfaces on both sides of the slot in the circumferential direction of the rotor. | 11-12-2009 |
| 20080224557 | ELECTRIC MOTOR WITH HALBACH ARRAYS - Electric motor configurations are provided with Halbach arrays. In one example, an electric motor includes a first plurality of magnets arranged in a first Halbach array. The first plurality of magnets is configured to provide a first magnetic field that substantially exhibits a first Halbach flux distribution. A first plurality of electromagnets comprising a first plurality of coils are arranged in a second Halbach array. A controller is adapted to selectively direct current through the first plurality of coils to induce a second magnetic field to interact with the first magnetic field. The second magnetic field substantially exhibits a second Halbach flux distribution. | 09-18-2008 |
| 20120293033 | ROTOR FOR ELECTRIC ROTATING MACHINE - A rotor includes a rotor core with a circumferential surface facing a stator and permanent magnets each received in a corresponding slot of the rotor core. Each of the permanent magnets has a first corner portion positioned closest to the circumferential surface of the rotor core and a first side surface that intersects an imaginary line, faces toward the stator side and makes up part of the first corner portion. The imaginary line extends in the magnetization direction of the permanent magnet through the center of the permanent magnet. Between the first side surface of the permanent magnet and the inner surface of the corresponding slot, there are formed a first gap, a second gap and an abutment area from the first corner portion side in this order. The first gap has a smaller width than the second gap in a direction perpendicular to the first side surface. | 11-22-2012 |
| 20090127960 | ANISOTROPIC PERMANENT MAGNET MOTOR - An anisotropic permanent magnet motor includes a stator and a rotor opposed to teeth of the stator with a gap therebetween, and the rotor includes an anisotropic permanent magnet disposed on a surface of a rotor yoke. The anisotropic permanent magnet has an orientation direction set in a direction normal to the outer-peripheral surface in a range of both θr°/2 from a magnetic pole center and continuously inclined toward a magnetic pole end with respect to a direction normal to the outer-peripheral surface. | 05-21-2009 |
| 20110057533 | ROTATING ELECTRICAL MACHINE - This invention provides a rotating electrical machine including a rotor that has an even number of first permanent magnets aligned in a circumferential direction of the rotor, second permanent magnets of a number equal to that of the first permanent magnets, provided respectively between the stator and circumferential ends of the first permanent magnets adjacent to each other in the circumferential direction, and core pieces of a number equal to that of the first permanent magnets, provided respectively between the second permanent magnets adjacent to each other in the circumferential direction. | 03-10-2011 |
| 20110234038 | ROTOR AND PERMANENT MAGNET ROTATING MACHINE - A rotor adapted for a large permanent magnet rotating machine having high output and demagnetization resistance and the permanent magnet rotating machine are provided. More specifically, there is provided a rotor adapted for a permanent magnet rotating machine, the machine comprising the rotor and a stator disposed with a clearance from an outer peripheral face of the rotor and formed by winding a winding wire through a stator core having two or more slots, the rotor comprising one or more permanent magnets in each of two or more insertion holes, the insertion holes being formed in a circumferential direction in a rotor core, wherein a magnetic coercive force in a stator-side surface region of each of the permanent magnets is greater than that in an inner central portion by 300 kA/m or more, the inner central portion being an inner portion at a depth of at least 5 mm from every outer shape face of the permanent magnet. There is also provided the permanent magnet rotating machine comprising this rotor and a stator disposed with a clearance from an outer peripheral face of the rotor and formed by winding a winding wire through a stator core having two or more slots. | 09-29-2011 |
| 20100133939 | MOTOR - A motor including a stator and a rotor is disclosed. The rotor includes a first unit and a second unit. The first unit includes an N-pole first magnet and an S-pole second magnet. The first and the second magnets are alternately arranged along a circumferential direction of the rotor at equal angular intervals to form magnetic pole portions. The second unit includes an N-pole or S-pole third magnet and a salient pole arranged in the rotor core. The salient pole functions as a magnetic pole that differs from the third magnet. The third magnet and the salient pole are alternately arranged along the circumferential direction of the rotor to form magnetic pole portions. The number of magnetic pole portions of the second unit is the same as the number of magnetic pole portions of the first unit. The third magnet and the magnet of the first unit having the same pole as the third magnet are aligned in the axial direction of the rotor. | 06-03-2010 |
| 20110241470 | BRUSHLESS ELECTRIC MACHINE - A first member ( | 10-06-2011 |
| 20100171386 | ROTOR FOR MAGNET-EMBEDDED MOTOR AND MAGNET-EMBEDDED MOTOR - The present invention provides a rotor a for magnet-embedded motor and a magnet-embedded motor whereby the manufacturing cost thereof can be significantly reduced while securing desired coercive force and magnetic flux density. A rotor for a magnet-embedded motor which comprises a plurality of permanent magnets | 07-08-2010 |
| 20110084565 | BRUSHLESS ELECTRIC MACHINE - A first member ( | 04-14-2011 |
| 20110068651 | ROTOR FOR PERMANENT MAGNET ROTATING MACHINE - In connection with a permanent magnet rotary machine comprising a rotor comprising a rotor core and a plurality of permanent magnet segments embedded in the rotor core and a stator comprising a stator core having a plurality of slots and windings therein, the rotor and the stator being disposed to define a gap therebetween, or a permanent magnet rotary machine comprising a rotor comprising a rotor core and a plurality of permanent magnet segments mounted on the surface of the rotor core and a stator comprising a stator core having a plurality of slots and windings therein, the rotor and the stator being disposed to define a gap therebetween, the rotor wherein each of the permanent magnet segments is an assembly of further divided permanent magnet pieces, and the coercive force near the surface of the magnet piece is higher than that in the interior of the magnet piece. | 03-24-2011 |
| 20120200189 | ROTATING ELECTRICAL MACHINE - A rotating electrical machine includes a rotor core, a stator core, and at least one permanent magnet. The rotor core has an inner circumference portion and an outer circumference portion. The stator core is opposed to the outer circumference portion of the rotor core. The at least one permanent magnet radially extends inside the rotor core. The at least one permanent magnet has an incremental circumferential width in a direction from the inner circumference portion to the outer circumference portion of the rotor core. | 08-09-2012 |
| 20090315424 | PERMANENT MAGNET SYNCHRONOUS MACHINE WITH SHELL MAGNETS - A permanent-magnet synchronous machine includes a stator that has slots and a rotor that has permanent magnets which form magnet poles. The permanent magnets are shell magnets having two curved surfaces. Each shell magnet covers a predetermined part of a magnet pole. The external radius of the shell magnets is less than 0.6 times the radius of the stator bore. Each shell magnet has a quasi-radial magnetic preferred direction that is directed substantially perpendicular to its outer surface. | 12-24-2009 |
| 20100117474 | AXIAL GAP MOTOR - An axial gap motor includes: a rotor; and a stator, wherein: the rotor includes a plurality of main permanent magnet parts and a plurality of auxiliary permanent magnet parts, the auxiliary permanent magnet parts being disposed near an end portion of each of the main permanent magnet parts and a magnetizing direction of each of the auxiliary permanent magnet parts corresponding to a direction perpendicular to the direction of the rotational axis; each of the stators includes a plurality of teeth arranged in a circumferential direction and protruding toward the rotor along the rotational axis, and a circumferential distance between a circumferential direction first end and a circumferential direction second end of each of the auxiliary permanent magnet parts on a surface opposite the stator is larger than a slot width of a slot defined between the teeth adjacent in the circumferential direction. | 05-13-2010 |
| 20110080066 | ROTOR FOR PERMANENT MAGNET ROTARY MACHINE - A permanent magnet rotary machine comprises a rotor comprising a rotor core and a plurality of permanent magnet segments embedded in the rotor core and a stator having a plurality of coils and disposed to define a gap with the rotor, or a permanent magnet rotary machine comprises a rotor comprising a rotor core and a plurality of permanent magnet segments mounted on the surface of the rotor core and a stator having a plurality of coils and disposed to define a gap with the rotor. In the rotor, each permanent magnet segment is an assembly of divided permanent magnet pieces, the coercive force near the surface of the magnet piece is higher than that in the interior of the magnet piece, and the assembly allows for electrical conduction between the magnet pieces. | 04-07-2011 |
| 20100066192 | RADIAL-DIRECTION GAP TYPE MAGNET MOTOR - In a radial-direction gap type magnet motor, when an energy density increases, a direction change Mθ/φp of a static magnetic field with respect to a mechanic angle between different poles increases in an exponential manner and thus to decrease a cogging torque of the motor is not compatible to increase a torque density. In order to solve the problem, assuming that φt denotes a mechanic angle of a stator iron core teeth, φp denotes a mechanical angle of a magnetic pole, and Mθ denotes an angle of a static magnetic field with respect to a circumferential tangential line of a radial magnetic pole center, a radial-direction type magnet motor in which φt<φp, Mθ in a magnetic pole center region is 75 to 90°, and Mθ/φp≦7 is satisfied in the magnetic pole end region of φp×0.1°, and further, a static magnetic field generating source is configured as a magnetic anisotropic magnetic pole having an energy density (BH) max≧150 kJ/m | 03-18-2010 |
| 20110260568 | Rotor for magnetic motor - Rotor formed by groups of materials ( | 10-27-2011 |
| 20110012463 | APPLIANCE, ROTOR AND MAGNET ELEMENT - A magnet element ( | 01-20-2011 |
| 20100038985 | BRUSHLESS DC MOTOR, MAGNETIZING METHOD THEREOF AND WASHING MACHINE HAVING THE SAME - Disclosed is a brushless DC motor, a magnetizing method thereof and a washing machine having the same. The brushless DC motor, comprising: a stator, and a rotor having a plurality of magnetic poles with a same thickness, wherein each of the magnetic poles is magnetized such that a magnetic flux density of an air gap is high at a central portion of each of the magnetic poles, compared to the magnetic flux density at both ends of each of the magnetic poles. Accordingly, a manufacturing cost can be reduced, a manufacturing process can be facilitated, and vibration and noise can be reduced. | 02-18-2010 |
| 20120038236 | Permanent Magnet Rotating Electric Machine and Electric Car Using the Same - A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized. | 02-16-2012 |
| 20110156522 | EXTERNAL FIELD INTERACTION MOTOR - Apparatus and associated methods involve thrust generation by interaction of an armature field with a stator field in an arrangement with substantially reduced flux coupling from the armature to the stator coil. In an illustrative example, solenoid coil segments may be arranged as the stator along a path of motion for the armature. In some examples, each armature may surround and overlap with at least one of the toroidal coil segments. Counter-electromotive force may be substantially reduced, for example, by stopping current flow in a stator coil while overlapped by the armature or while substantial armature flux couples to the stator coil. Thrust may be generated, in some examples, by interaction of armature and stator coil flux in arc-shaped regions external to and between each of the leading and trailing edges of the armature and their respective nearby stator coils. | 06-30-2011 |
| 20120153763 | SYNCHRONOUS MOTOR - A synchronous motor which causes decrease in iron loss without increase in copper loss due to increase in q-axis current, and increases efficiency. The synchronous motor includes a rotor, the number of magnetic poles of which is changeable. The magnetic poles of the rotor include permanent magnets and electromagnets having changeable polarity, and the number of the magnetic poles of the rotor is changed by changing a current flow direction of the electromagnets. | 06-21-2012 |
| 20090021097 | PERMANENT MAGNET ROTATOR AND MOTOR USING THE SAME - A motor generally has a contradictory relation between decrease of cogging torque and increase of torque density. To overcome this problem, continuous direction control is provided for anisotropy with modification of magnetic poles so that the average absolute value of differences between Mθ and 90×sin [φ{2π/(360/p)}] is set to be 3° or less, where Mθ is a direction of anisotropy with respect to a radial tangent line of a magnetic pole plane, φ is a mechanical angle, and p is the number of pole pairs. | 01-22-2009 |
| 20100219712 | ROTOR OF ROTARY ELECTRIC MACHINE, AND PRODUCTION METHOD THEREFOR | 09-02-2010 |
| 20120080972 | SINTERED MAGNET AND METHOD FOR PRODUCING THE SAME - There is provided a sintered magnet that is capable of, as compared to conventional divided magnets, significantly reducing eddy loss, flexibly accommodating diverse shape and dimensional variations, and significantly lowering productions costs while maintaining the desired coercivity, as well as a method of producing same. It is a sintered magnet | 04-05-2012 |
| 20100225192 | Printed circuit board and method of manufacturing the same - A permanent magnet rotor of a brushless direct current (BLDC) motor, in which cogging torque ripple and electromagnetic vibration noise transferred to the permanent magnet rotor can be blocked and a motor's power-to-weight ratio can be improved. A conventional BLDC motor has to use an electric steel sheet core so as to maintain the maximum magnetic flux density of the permanent magnet rotor and to minimize a rotating electric field loss. As a result, cogging torque vibration is unavoidably transferred to a load side through the motor rotary shaft. However, the rotor can enable stable driving of the BLDC motor by innovatively blocking the cogging torque vibration and the electromagnetic vibration noise and can greatly reduce the motor's weight by using a plastic or non-magnetic material instead of an electric steel sheet core. | 09-09-2010 |
| 20090146518 | Anisotropic bonded magnet for use in a 4-pole motor, a motor employing that magnet, and an alignment process apparatus for the anisotropic bonded magnet for use in a 4-pole motor - A hollow cylindrically shaped anisotropic bonded magnet for use in a 4-pole motor, is formed by molding anisotropic rare-earth magnet powder with resin. The alignment distribution of the anisotropic rare-earth magnet powder in a cross section perpendicular to the axis of the anisotropic bonded magnet is in the normalized direction of the cylindrical side of the hollow cylindrical shape in the main region of a polar period, and in a transition region in which the direction of the magnetic pole changes, steadily points towards a direction tangential to the periphery of the cylindrical side at points closer to the neutral point of the magnetic pole, and becomes a direction tangential to the periphery of the cylindrical side at that neutral point, and steadily points toward the normalized direction of the cylindrical side at points farther away from the neutral point. | 06-11-2009 |
| 20120091848 | PERMANENT MAGNET ELECTRIC MOTOR - An increase of the magnetization current can be prevented during demagnetization and magnetization, and a variable speed operation can be achieved at a high power output over a wide range of from a low speed to a high speed. A rotor ( | 04-19-2012 |
| 310156440 | Different pole width | 3 |
| 20080265705 | Rotary Machine and Electromagnetic Machine - The objective of the present invention is to provide a configuration of the permanent magnets used for rotors in a rotating electronic device and the method of utilizing the same, thereby improving the efficiency, performance and output thereof. It also intends to provide a rotating electronic device that can be miniaturized. To achieve the above objectives, permanent magnets are arranged radially and circularly on a rotor to control the magnetic flux generated by permanent magnets arranged radially on the rotor to be approximately twice as much as the primary magnetic flux generated by permanent magnets arranged circularly thereon. On the rotating surface of the rotor, a secondary magnetic flux is provided and a shape and width of the grooves are modified such that the magnetic flux distribution resulting from the overall interaction of each magnetic flux generated in each magnetic pole on the rotor appears substantially as a sine wave. | 10-30-2008 |
| 20100019603 | ROTOR FOR AN ELECTRIC MACHINE - A rotor for an electrical machine includes a rotor hub and a plurality of permanent magnet segments affixed around a perimeter of the rotor hub. A first plurality of the permanent magnet segments have a substantially uniform arcuate span and are formed of a single unitary piece of material. A multi-piece permanent magnet segment includes at least two pieces, each having a smaller arcuate span than the first plurality of segments. The magnetization direction vector of one piece different than the magnetization direction vector of at least one other piece in each multi-piece segment. | 01-28-2010 |
| 20080296989 | ROTOR OF ROTARY ELECTRIC MACHINE, AND ROTARY ELECTRONIC MACHINE - The depth from the open end of a rotor slot closest to a magnetic pole of a rotary core to a slot bottom or the bottom of a subslot provided as a coolant ventilation path on a rotor slot bottom is made less than the depth of slots at and after a second slot counted from the magnetic pole side in the direction of internal circumference, and when a shortest distance between the bottoms of the rotor slots opposed to each other through a magnetic pole or a shortest distance between the bottoms of the subslots is assumed to be a magnetic pole width of the slots, a magnetic pole width Wp | 12-04-2008 |
| 310156450 | Specific dimensions | 4 |
| 20100176681 | TOOTHED ROTOR EQUIPPED WITH FERROMAGNETIC INTERPOLAR ELEMENTS OF OPTIMIZED WIDTH AND ROTARY MACHINE EQUIPPED WITH SUCH A ROTOR - A rotating electrical machine rotor which comprises: a rotary shaft; two field spiders which have the same diameter ranging between 90 and 120 mm and which are mounted centred on the shaft, each field spider comprising a circular radial plate; prongs extending axially toward the other field spider so as to nest tangentially between two adjacent axial peripheral prongs of the other field spider; an interpolar tangential space left between the opposing parallel lateral faces of two consecutive prongs of each field spider; and at least one ferromagnetic interpolar element the width (Lf) of which is defined orthogonal to the lateral faces of the adjacent prongs. According to the invention, the active width (Lf) of the ferromagnetic element is between 5 mm and 6 mm. | 07-15-2010 |
| 20100308679 | MICRO ROTOR AND ROTARY ELECTRIC MACHINE INCORPORATING SAME - A micro rotor is disclosed and includes a plurality of circular or annular plate-shaped thick film magnets which each include an isotropic magnet with a thickness t | 12-09-2010 |
| 20110175481 | PERMANENT TYPE ROTARY MACHINE - The permanent magnet type rotary machine is capable of reducing cogging torque even if permanent magnets are displaced in the axial direction and which is capable of reducing production cost and increasing torque. At least a stator unit of a first phase out of two stator units, which are stacked with a phase difference of (360°/(2P)), is stacked m-th, from one end of the stack of the stator units, to face magnetic poles of one of the permanent magnets. The other stator unit of the second phase, whose excitation cycle is shifted ¼ cycle with respect to that of the stator unit of the first phase, is stacked ((nQ/2)+m)-th, from the one end of the stack, to face magnetic poles of another permanent magnet. Note that, P is number of the magnetic poles of the permanent magnet; m is an integer of (nQ/2) or less, and one or more; Q is an even number of two or more; and n is an integer of one or more, and the product of n×Q is an integer of four or more. | 07-21-2011 |
| 20120038237 | BRUSHLESS MOTOR - A brushless motor has a stator and a rotor. The stator has a stator core and stator windings. The stator core has a stator yoke and teeth extending radially inwardly from the stator yoke. The stator windings are formed by concentrated coils wound on the teeth. The rotor has a rotor shaft, a rotor core fixed to the rotor shaft and magnets fixed in slots formed in the rotor core. Each magnet is plate shaped and extends in both axial and radial directions of the rotor and each magnet is magnetically charged across its thickness so that a rotor pole is formed between two adjacent magnets. The ratio of the radial thickness (Y) of the stator yoke to the width (T) of the tooth body is from 0.4 to 0.7. | 02-16-2012 |
| 310156460 | Shaped to vary air | 7 |
| 20100133940 | THREE-PHASE DYNAMOELECTRICAL PERMANENTLY EXCITED SYNCHRONOUS MACHINE - A three-phase dynamoelectrical permanently excited synchronous machine includes a stator with teeth which point to a rotor, wherein twelve slots are formed between the teeth. The slots have coil sides of coils of a winding system in such a manner that two coil sides of different coils are situated in each slot. The rotor has a cylindrical support structure which is provided with permanent magnets defined by an inner radius which corresponds to a radius of the support structure, and by an outer radius which is smaller than their inner radius. The permanent magnets are formed with ten magnet poles when viewed in a circumferential direction. | 06-03-2010 |
| 20080284269 | Permanent Magnet Electric Rotating Machine and Electromotive Vehicle Using Permanent Magnet Electric Rotating Machine - A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided. | 11-20-2008 |
| 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 |
| 20110248595 | ELECTRIC MOTOR - An electric motor ( | 10-13-2011 |
| 20110248594 | Electrical Machine and Permanent-Magnet - An electrical machine including a permanent magnet and a coil is provided. The coil is arranged to interact with the permanent magnet via an air gap, which located between the two. The permanent magnet includes a surface, which is aligned to the coil and to the air gap so that that magnetic forces of the permanent magnet interact via the surface and the air gap with the coil by a magnetic flux density distribution. The surface has a cross-section having a shape that approximates at least partly to a sinusoidal function, causing the magnetic flux distribution in the air gap to be substantially sinusoidal. | 10-13-2011 |
| 20100026126 | OUTER ROTOR-TYPE FAN MOTOR AND METHOD FOR MAGNETIZING MAGNET APPLIED THERETO - An outer rotor-type fan motor and a method for magnetizing a magnet applied thereto. The outer rotor-type fan motor comprises a rotation shaft; a stator disposed outside the rotation shaft; a fan having a hub and blades formed on the hub, the hub covering the stator with a predetermined gap; and a magnet disposed on an inner surface of the hub and spaced from the stator with a predetermined gap, wherein the magnet is an isotropic magnet magnetized to have a pole anisotropy. Accordingly, a cogging torque and noise are reduced without reducing a back-electromotive force, thereby obtaining a high efficiency. | 02-04-2010 |
| 20110089782 | ROTOR FOR ELETROMOTOR USING PERMANENT MAGNETS - A rotor for an electromotor using permanent magnets is provided. The rotor may include one or more C-type permanent magnets, a core, and a rotor shaft. Each of the one or more C-type permanent magnets may have a C shape and provide magnetic force. The core may be of a cylindrical shape and have the one or more C-type permanent magnets coupled thereto with different magnetic poles. An aperture | 04-21-2011 |
| 310156470 | Skewed | 8 |
| 20100117475 | Permanent Magnet Machine with Offset Pole Spacing - An internal permanent magnet machine has multiple rotor sections, each section having multiple rotor laminations. Permanent magnets are placed asymmetrically in lamination openings to attenuate oscillations in torque caused by harmonic components of magnetic flux. | 05-13-2010 |
| 20120068568 | Axial Winding Motor - An axial-winding motor includes a stator and a rotor. The stator has a winding assembly, a first magnetic-conducting plate and a second magnetic-conducting plate. The first and second magnetic-conducting plates are coupled with two ends of the winding assembly in an axial direction of the winding assembly. The first magnetic-conducting plate includes a plurality of first pole pieces on an outer periphery thereof, and the second magnetic-conducting plate includes a plurality of second pole pieces on an outer periphery thereof. The rotor is rotatably coupled with the stator and has a plurality of magnetic pole faces facing the stator. One of the first pole pieces is at least partially overlapped with adjacent one of the second pole pieces in an axial direction of the stator. | 03-22-2012 |
| 20090243416 | ELECTRIC MOTOR - An electric motor having a stator and a mover is disclosed. The stator has excitation coils of three phases, and the mover is movable relative to the stator. The mover has an opposed surface facing the excitation coils. Field poles or protrusions are provided on the opposite surface. The field poles or the protrusions extend helically about the axis of the mover. Each excitation coil extends helically in the same direction as the field pole or the protrusion about the axis of the mover so as to face the field pole or the protrusion. | 10-01-2009 |
| 20090160283 | Rotary/linear Drive with a Rotary Drive which is Free of Axial Forces - The aim of the invention is to provide a linear rotation drive wherein the oscillating torques are reduced to a minimum and whose rotation drive is devoid of axial forces. For this purpose, a magnet of the linear rotation drive is provided with sloped sections or a plurality of magnet sections is configured to give at least two sloped magnet arrangements which are symmetric to a line extending in the circumferential direction of the linear rotation drive. Oscillating torques can also be avoided by distributing the magnets across the circumference of the rotor or stator in an uneven manner. Favorable results can be obtained when the least common multiple of the number of grooves and the number of poles is as high as possible. | 06-25-2009 |
| 20100283348 | BRUSHLESS MOTOR - Provided is a brushless motor of a 2P3S×n structure, in which a ratio (W) of a circumferential width (Wm) of each of magnets ( | 11-11-2010 |
| 20100117476 | ELECTRICAL MACHINES WITH REDUCED COGGING - An electrical machine has at least two separate groups of at least two circumferentially adjacent magnet poles. One of the circumferentially outer magnet poles in one of the groups of magnet poles is defined as being in its reference position. The reference position of each other magnet pole is defined as the position each other magnet pole would occupy if all the magnet poles were equally circumferentially spaced around the first or second body and the one circumferentially outer pole was in its reference position. At least one of the circumferentially outer magnet poles in each group is sited in its reference position. At least one magnet pole in each group is a displaced magnet pole and is sited in a position that is displaced from its reference position by an amount that is not equal to an integral multiple of the reference angular pitch of the winding slots. The displacement of the magnet poles provides a pronounced reduction in cogging. | 05-13-2010 |
| 20100277027 | SKEW PATTERN FOR A PERMANENT MAGNET ROTOR - A rotor for an electric machine includes a plurality of magnet stacks having at least five permanent magnets formed into a skew pattern within each of the magnet stacks. The skew pattern has a skew angle and at least two skew steps, and is an angle of rotation about the axis between individual magnets adjacent to the skew steps. The skew pattern may be an axially-symmetric V-shape. The plurality of magnet stacks may have five, six, or eight permanent magnets therein. The number of skew steps may be equal to two or three. The skew angle may be calculated as 360 degrees, divided by the number of skew steps plus one, multiplied by the least common multiple of the number of rotor poles and the number of the plurality of stator slots. | 11-04-2010 |
| 20120007458 | ELECTRICAL MACHINE - An electrical machine comprising a stator and a rotor rotatable relative to the stator with an air gap therebetween is disclosed. The stator is provided with a first plurality of sources of magnetic field which is equally spaced in a circumferential configuration over the stator. The rotor is provided with a second plurality of sources of magnetic field which is equally spaced in a circumferential configuration over the rotor. The magnetic sources of at least one plurality are electromagnets; each electromagnet comprises at least one magnet coil resting on a magnet conductor. The magnetic conductor comprises at least one member made of magnetically isotropic and/or anisotropic materials. | 01-12-2012 |
