Abstract: Provided is a motor capable of suppressing reduction of the torque of the motor even if the amount of use of the permanent magnets embedded in the rotor core is reduced. A motor includes a rotor with permanent magnets embedded in a rotor core, and a stator positioned on an outer circumference of the rotor. The rotor includes magnetic poles formed around a rotation axis of the rotor, the magnetic poles having the permanent magnets arranged therein. The permanent magnets in adjacent magnetic poles are arranged such that positions of a north pole and a south pole of the permanent magnet in one magnetic pole are inverted from those of the permanent magnet in a magnetic pole adjacent to the one magnetic pole. The permanent magnets each have a residual magnetization that decreases as it moves from the north pole toward the south pole.

Abstract: A BLDC motor server includes a stator configured in a hollow cylindrical shape and comprising a plurality of teeth around which a plurality of coils is wound to form an electromagnetic field, respectively; and a rotor configured in a cylindrical shape rotatable within the stator and comprising a plurality of permanent magnets, each having an arched section in which an outer circumference side is extended in both directions from a rotation center side, wherein the plurality of permanent magnets is disposed, so that facing outer surface portions of two permanent magnets neighboring each other are adjacent to each other, and wherein a width Wo of the outer circumference side of each permanent magnet is configured to be smaller than a width Wc of the rotation center side thereof. The BLDC motor may reduce a noise and a vibration as well as increasing an efficiency of the motor.

Abstract: A multi-phase electric machine may include a stator, and a rotor for rotating within the stator, the rotor including poles having combination magnet pieces with varying strengths and dimensions creating a non-sinusoidal back EMF. In one aspect, a multi-phase electric machine may include a stator, and a rotor for spinning within the stator, the rotor includes a plurality of poles having magnet assemblies includes at least a low strength magnet and a high strength magnet therein for creating a non-sinusoidal back EMF. In other aspects, a multi-phase electric machine of the present disclosure includes a stator, and a rotor for spinning within the stator, the rotor including a plurality of poles having magnet assemblies includes at least a first magnet and second magnet therein for creating a non-sinusoidal back EMF wherein a strength ratio of the first magnet and second magnet greater than the absolute value of 1.

Abstract: An electric machine includes a stator defining multiple stator poles with associated stator windings configured to receive a stator current. The electric machine also includes a rotor defining multiple fixed rotor poles with associated rotor windings, wherein the rotor defines a field energizable by magnetic fields produced by the stator windings when receiving the stator current to produce relative motion between the rotor and the stator and wherein the rotor is maintained in synchronicity with the magnetic fields produced by the stator during operation of the electric machine. The electric machine also includes a rectification system configured control against an alternating current being induced in the rotor poles as the field is energized by magnetic fields produced by the stator windings when receiving the stator current.

Abstract: A method may include providing a stator. The method may also include equipping the stator with quadruple three-phase winding sets with concentrated fully-pitched winding. The quadruple three-phase winding sets may be connected in such a way that emulates a six-phase stator. Further, the quadruple three-phase winding sets may have the same conductor cross-sectional area. In addition, the quadruple three-phase winding sets may include a plurality of winding groups.

Abstract: A two-phase bipolar step motor, comprises a rotor having a plurality of pairs of rotor poles of alternating magnetic polarity, and a stator having four primary energizable stator poles with conductive windings around those primary stator poles and four passive inter-poles located uniformly between every adjacent pair of primary stator poles, the passive inter-poles lacking any conductive windings. Both 18° steppers with five pairs of rotor poles and 30° steppers with three pairs of rotor poles are provided. Also provided are both PM hybrid mix steppers with 2D magnetic flux paths and hybrid steppers with 3D magnetic flux paths having an axial component. In each case, the overall lengths of the flux paths are substantially reduced from conventional designs resulting in improved motor efficiency.

Abstract: A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet comprises La and Co, a content of B is 0.005 to 0.9% by mass in terms of B2O3, a content of Zn is 0.01 to 1.2% by mass in terms of ZnO, and the ferrite sintered magnet satisfies [La]/[Zn]?0.79 and [Co]/[Zn]?0.67 when an atomic concentration of La is represented by [La], an atomic concentration of Co is represented by [Co], and an atomic concentration of Zn is represented by [Zn].

Abstract: Provided is a motor for a drone comprising: a rotary shaft; a stator including a hole in which the rotary shaft is disposed; a rotor disposed outside the stator; and a housing coupled to the stator, wherein the stator comprises a stator core and a coil wound around the stator core, wherein the stator core comprises an annular yoke coupled to the housing, teeth extending radially from the yoke, and a shoe disposed at one end of the teeth, wherein the teeth comprise protrusions projecting from the side surface thereof. As such, the present invention provides an advantageous effect of securing an air flow path for heat radiation to enhance a heat radiating effect while preventing water or foreign matter from flowing into the motor.

Abstract: The present disclosure provides a molding method, a manufacturing method and a molding device for a radially anisotropic multipolar solid magnet, a micro-motor rotor using this magnet, and a component for a motor. A mold core is removed from a mold, and oriented poles, the number of which is the same as that of poles of a radially anisotropic multipolar solid cylindrical magnet, are arranged outside the mold. The sum L of widths or arc lengths of top ends of all the oriented poles is greater than or equal to 0.9?D, where D is the outer diameter of a mold sleeve. The magnet production method breaks through the dimensional restriction to the manufacturing of radially anisotropic multipolar magnets in the prior art, and can produce radially anisotropic multipolar magnets having an inner diameter or diameter less than 3 mm or even less for high-precision micro-motors.

Abstract: A rotating electric machine includes a field that includes a magnet unit having a plurality of magnetic poles, an armature including a multi-phase armature coil, and an electric power conversion device that is configured to perform electric power conversion and supply electric power resulting from the electric power conversion to the armature. Moreover, one of the field and the armature is configured as a rotor while the other is configured as a stator. The electric power conversion device includes at least one band-shaped busbar through which electric current flows during the electric power conversion. The at least one busbar has a cross section where a thickness in a lateral direction of the cross section at one end of the cross section in a longitudinal direction of the cross section is smaller than a thickness in the lateral direction at the other end of the cross section in the longitudinal direction.

Abstract: Disclosed is a radial-axial air gap three-phase disc-type transverse flux permanent magnet motor. Each phase includes a stator consisting of shoe-shaped stator cores and shoe-shaped permanent magnets, and a radial-axial rotor. The permanent magnets are magnetized in the circumferential direction, and the magnetization directions of the two adjacent permanent magnets are opposite to each other. Armature windings are wound in the grooves formed by the alternately arranged stator cores and the permanent magnets. The radial-axial rotor includes radial teeth, axial teeth, and right-angled yokes. The radial teeth are connected to the axial teeth through the right-angled yokes. Adjacent radial/or axial teeth are spaced at a mechanical angle of 360/n degrees. Radial teeth and the adjacent axial teeth under the same pole pairs are spaced at a mechanical angle of 180/n degrees, where n is the number of pole pairs of the radial-axial air gap three-phase disc-type transverse flux permanent magnet motor.

Abstract: A direct current (DC) electric motor assembly with a closed type overlap stator winding which is commutated with a timed commutating sequence that is capable of generating a stator rotating magnetic field. The coil overlap of the winding and a timed commutation sequence are such that the current in each slot of the stator is additive and when a previous magnetic pole collapses according to a commutation sequence; the energy released by that previous collapsing magnetic field is captured to strengthen the next magnetic field on the commutation sequence schedule. Electrical currents produced by the collapsing magnetic fields flow to low electric potential and add or subtract to the DC current provided by the commutator thus promoting formation of the next magnetic on commutation schedule. When used with a suitable commutator and rotor, the electric motor assembly provides a true brushless high torque speed controlled Real Direct Current (RDC) motor that operates with higher efficiency and higher power density.

Abstract: A motor includes a stator and a rotor. The rotor includes: a plurality of rotor core segments arranged along a circumferential direction of the rotor on the inner side or the outer side of the stator and spaced apart from one another to define a plurality of permanent magnet arrangement slots between the plurality of rotor core segments, a plurality of permanent magnets inserted into the plurality of permanent magnet arrangement slots, respectively, a rotor frame that couples the plurality of rotor core segments and the plurality of permanent magnets to each to other, and an outer ring that is made of a non-magnetic material and that surrounds an outer end of the plurality of rotor core segments and an outer end of the plurality of permanent magnets. The plurality of rotor core segments and the plurality of permanent magnets are alternately arranged along the circumferential direction of the rotor.

Abstract: Provided is a rotating electric machine, including: a stator including: an annular core back; and a plurality of teeth projecting in a radial direction from the core back and being arranged in a circumferential direction, the plurality of teeth having slots each formed between the plurality of teeth adjacent to each other in the circumferential direction; and a rotor including: an annular rotor core which is arranged coaxially with the stator through a magnetic gap; and a plurality of magnetic poles arranged on the rotor core in the circumferential direction, wherein the rotor core includes a plurality of segment cores formed by dividing the rotor core in the circumferential direction with at division surfaces, and wherein the number of segments of the rotor core is different from a divisor and a multiple of the greatest common divisor of the number of poles of the rotor and the number of slots.

Abstract: A rotor core has first and second magnet insertion holes along an outer circumference, and first and second slits along an inner circumference. The first and second slits have first and second facing portions facing each other. The first facing portion has a first inner end and a first outer end. The second facing portion has a second inner end and a second outer end. An inter-slit portion is provided between the first and second facing portions and is defined by a first straight line connecting the first and second inner ends and a second straight line connecting the first and second outer ends. In a radial direction of the rotor core, a minimum distance D1 from the inner circumference to the slits, a minimum width W1 of the slits, and a length W2 of the inter-slit portion satisfy at least one of D1<W1 and D1<W2.

Abstract: A permanent magnet comprises crystal grains each including a main phase. An average size of the crystal grains is 1.0 ?m or less, and a degree of orientation of easy magnetization axes of the crystal grains to an easy magnetization axis of the magnet is 15% or more and 90% or less. A recoil magnetic permeability is 1.13 or more, a residual magnetization is 0.8 T or more and less than 1.16 T, and an intrinsic coercive force is 850 kA/m or more.

Abstract: A manufacturing method of a core for a rotary electric machine, the method includes inserting a permanent magnet that is not yet magnetized in a magnet insertion hole that is formed in a rotor core; injecting a magnet fixing material in the magnet insertion hole; curing the magnet fixing material by heating the rotor core and the permanent magnet; and magnetizing the permanent magnet before a temperature of the rotor core and the permanent magnet decreases to a normal temperature, after the curing of the magnet fixing material.

Abstract: An electric motor including: a frame; a rotor assembly including a magnet, a bearing assembly, an impeller, and a shaft; and a stator assembly including a stator core and a bobbin. The frame has an inner wall and an outer wall, the outer wall surrounds the inner wall and defines an annular channel between the inner wall and the outer wall, and diffuser vanes extend from the inner wall to the outer wall through the annular channel. The inner wall defines a bore for supporting the rotor assembly, and the outer wall defines a substantially cylindrical outer casing of the motor.

Abstract: A rotary electric machine equipped with a magnetic flux variable mechanism includes a case body, a mover moving upon receipt of centrifugal force, a magnetic flux short circuit member, a cam member, and biasing springs. The cam member includes a cam surface so as to face the mover and make contact with the mover, and the cam member converts a radial movement of the mover received by the cam surface into an axial movement of the magnetic flux short circuit member. The biasing springs give a biasing force to the magnetic flux short circuit member in a direction distanced from an axial end surface of the rotor core, so as to determine a position of the magnetic flux short circuit member along the axial direction in a state where the biasing force is balanced with the centrifugal force applied to the mover via the cam member.

Abstract: Provided is a method for implementing skewing in a hybrid homopolar generator. The method includes aligning slots within an axial front segment of a stator, with corresponding slots within an axial back segment of the stator. The method also includes moving, during assembly, the axial front segment and the axial back segment relative to each other such that slots in the axial front segment and the axial back segment form a pattern.

Abstract: There are disclosed winding configurations for electric machines that employ printed circuit board (PCB) type end winding connections to enable an automatic and faster assembly of the electric machines. The winding configurations provide a compact PCB-type end winding arrangement with an optimal fewer number of turns/bars in the slots of the board to complete the loop of winding connections. The winding configurations have application in three phase or multiple phase inner rotor or outer rotor electric machine topologies.

Abstract: The present disclosure relates to an electric drive motor (101; 201) for a vehicle. The electric drive motor (101; 201) has a stator (103) having a plurality of slots (107); and a rotor (102; 202) having a plurality of poles (106; 206). The poles (106; 206) each have at least a first permanent magnet (104; 204) centred on a d-axis of the pole (106; 206); and a plurality of flux barriers (109; 209) for disrupting at least an n-th order torque harmonic of the electric drive motor (101). Proximal to an outer surface of the rotor (102; 202), a first angular period (x11) between first and secondary flux barriers is defined by the equation (xi1=tao/n1), whereby: (xi1) is the first angular period; (tao) is the pole step; and n1 is an order number of a torque harmonic to be disrupted.

Abstract: A rotor assembly with a rotor hub, a plurality of permanent magnets positioned circumferentially around at least a portion of the rotor hub, and a coating on at least a portion of the plurality of permanent magnets. The coating forming a retaining band that circumferentially extends around the rotor hub and the plurality of permanent magnets. The coating includes a nano-crystalline layer including a metal or metal alloy and defines an average grain size of less than about 50 nanometers (nm).

Abstract: A rotor includes a unitary, single material substrate defining a rotor lamination having pockets defining legs and configured to contain permanent magnets therein to establish a magnetic pole of the rotor. The rotor includes a first region having a predefined magnetic permeability. The rotor includes a second region defined between the legs and an outer periphery of the lamination. The second region has a magnetic permeability less than the first region to reduce torque ripple of a predetermined harmonic order.

Abstract: A rotor for a rotary electric machine, the rotor including a rotor core that has a magnet hole; a permanent magnet inserted into the magnet hole; and an adhesive layer provided between the permanent magnet and a wall surface of the magnet hole and including a plurality of capsule bodies therein, the adhesive layer fixing the permanent magnet to the wall surface of the magnet hole, wherein the adhesive layer is provided only on a wall surface of the magnet hole on a first side, which is one of a wall surface of the magnet hole on an inner side in a radial direction and a wall surface on an outer side in the radial direction.

Abstract: A rotor includes a first slot, a second slot, a first flux barrier, and a second flux barrier. As viewed in a direction of the rotation axis of a rotor core, the substantially rectangular first and second slots are provided in a V-shape pattern. As viewed in the rotation axis direction of the rotor core, the first flux barrier is provided between first and second contact parts, and protrudes toward the outer circumference side from the outer circumferential short side of each of the first and second slots. As viewed in the rotation axis of the rotor core, an outer circumferential wall of the second flux barrier is continuous with the first contact part, and the second flux barrier protrudes from an inner long side of each of the first and second slots.

Abstract: Disclosed herein is an electronic device with multiple independently functional components capable of sharing information through a connector channel that in one embodiment is worn on the body of the user with automatic attachment and detachment capability including via external communication or command.

Abstract: A vehicle may include an electric machine. The electric machine may include a stator surrounding sections stacked to form a rotor. Each of the sections may have nested pairs of permanent magnets radially spaced from a rotational axis of the rotor. Corresponding pairs of permanent magnets of each of the sections may be aligned along a direction of the rotational axis. Corresponding chambers adjacent to the permanent magnets may have different shapes such that corresponding pole arc angles are different.

Abstract: According to some aspects of the present disclosure, example stator assemblies for three phase dynamoelectric machines and related winding methods are disclosed. An example stator assembly generally includes a non-segmented stator core including a stator yoke and a plurality of teeth. The stator assembly also includes a plurality of coil portions electrically coupled in a delta winding pattern, and including a first coil portion extending around a first one of the plurality of teeth and a second coil portion extending around a second one of the plurality of teeth. The stator assembly further includes a plurality of connection portions including a first connection portion extending between the first coil portion and the second coil portion and electrically coupling the first coil portion and the second coil portion. The first coil portion, the second coil portion and the first connection portion are defined by a continuous length of winding wire.

Abstract: A permanent magnet electric machine (PM machine) for a vehicle or other system includes a rotor assembly, fixed permanent magnets, a stator, an actuator, and one or more repositionable/moveable flux-shunting elements. The flux-shunting element is repositioned to control flux at specific operating points of the PM machine. The rotor assembly has a rotor coaxially surrounding and coupled to a rotor shaft. The permanent magnets are mounted to or in the rotor, and the moveable flux-shunting element is positioned between the rotor shaft and a respective one of the permanent magnets. Inboard and outboard ends of each respective permanent magnet may be oriented toward the rotor shaft and stator, respectively. The actuator selectively positions the moveable flux-shunting element at one or more operating points of the PM machine to vary reluctance in a magnetic circuit formed by the stator and rotor assembly.

Abstract: 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)max of 150 kJ/m3 or more, which sets a center point Pc of the magnetic poles in a circumferential direction on a rotor outer circumferential surface to a maximum thickness tmax, wherein when a line connecting the Pc and a rotational axis center Rc is Pc-Rc, a straight line connecting an arbitrary point Px in the circumferential direction on the rotor outer circumferential surface and the Rc is Px-Rc, an apex angle of the lines Pc-Rc and Px-Rc is ?, a number of pole pairs is Pn, a circumferential direction magnetic pole end is Pe, and a magnetic pole end biasing distance ?LPe of the circumferential direction magnetic pole ends Pe is ?×tmax (? is a coefficient).

Abstract: There is provided a rare earth-cobalt permanent magnet containing 23 to 27 wt % R, 3.5 to 5 wt % Cu, 18 to 25 wt % Fe, 1.5 to 3 wt % Zr, and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. It has a metal structure including a cell phase (11) containing Sm2Co17 phase and a cell wall (12) surrounding the cell phase (11) and containing SmCo5 phase.

Abstract: An electric wheel hub, comprising a wheel hub (1) and an inner ring gear (2). The inner ring gear and the wheel hub are fixed coaxially and rotate synchronously. A drive motor is provided within an inner cavity of the wheel hub. A motor shaft of the drive motor has one end fitting to the inner ring gear via a planetary reduction mechanism, and the other end provided with an electromagnetic braking mechanism. The wheel hub of the present invention has advantages of reducing the weight of a drive wheel, lowering manufacturing costs, etc. Also disclosed is a drive wheel.

Abstract: A hollow rotor shaft for a rotor of an electrical machine may include a cylinder barrel closed off by face flanges on both sides. The cylinder barrel may enclose a shaft cavity. A shaft journal may be configured on each face flanges. An inlet may be disposed in one of the shaft journals by way of which a cooling fluid may pass into the shaft cavity and onto an inner surface of the cylinder barrel. A distribution element may be disposed in the shaft cavity. The distribution element may receive the cooling fluid that enters through the inlet, conduct the cooling fluid in a direction of the inner surface of the cylinder barrel by way of a rotation-symmetrical drainage surface, and give off the cooling fluid to the inner surface by way of a mouth region.

Abstract: A magnetic-plate laminated body includes: a laminated part made up of a plurality of laminated soft magnetic ribbons; first and second metal plates that sandwich the laminated part from upper and lower surfaces in a lamination direction of the laminated part; and a fastening mechanism that penetrates the first and second metal plates and the laminated part and fastening the laminated part by the first and second metal plates.

Abstract: A rotor core of a rotor includes: a plurality of protrusions formed on at least a step-skew boundary side; and a tubular non-magnetic ring mounted on outer peripheries of a plurality of permanent magnets so as to cover the boundary. The non-magnetic ring includes a plurality of inner diameter bulging portions. Each of the permanent magnets and each of the protrusions are brought into abutment against the corresponding inner diameter bulging portions.

Abstract: A rotating electric machine includes: a stator having an armature core having slots formed between magnetic pole teeth, and a plurality of coils each of which is wound so as to straddle a plurality of the magnetic pole teeth; and a rotor including a plurality of permanent magnets disposed at certain intervals on an outer peripheral surface of the magnetic yoke, and the coils include an armature coil for driving the rotating electric machine and a non-armature coil for magnetizing or demagnetizing the permanent magnets of the rotor.

Abstract: The described apparatus and method enable alteration of motor properties during operation of a motor. For example, the rotor of the motor may be adjustable, during motor operation, between a first diameter and a larger, second diameter. When the diameter of the rotor increases, the distance between the electromagnetic coils of the stator and the magnets of the rotor increases, thereby reducing the back-electromotor force (back-EMF) of the motor. When the back-EMF of the motor decreases, the torque of the motor decreases but the maximum revolutions per minute (RPM) increases. When the diameter of the rotor decreases, the distance between the electromagnetic coils of the stator and the magnets of the rotor decreases, thereby increasing the back-EMF of the motor. When the back-EMF of the motor increases, the torque of the motor increases but the maximum RPM decreases.

Abstract: A rotor for a rotating electric machine has interference and lightening holes. The rotor includes a shaft and a rotor iron core. The shaft is press fitted in the rotor iron core. The rotor iron core includes a shaft hole, an outer area, an inner area in which the shaft is press fitted, a plurality of ribs connecting the outer area and the inner area. Each of the ribs includes a plurality of outer rib joints adjacent to the outer area, a plurality of outer rib portions adjacent to the outer area, a plurality of inner rib joints adjacent to the inner area, and a plurality of inner rib portions adjacent to the inner area. The outer rib portions are connected to the inner rib portions and the total number of the inner rib joints is larger than that of the outer rib joints.

Abstract: An electric machine rotor includes a lamination configured to rotate about a central axis and a plurality of pairs of permanent magnets. Each pair of permanent magnets is arranged in a V-shaped pattern and affixed within the lamination to create a magnetic field for rotation of the lamination. The lamination also includes an outer periphery spanning circumferentially outside of the permanent magnets, wherein a mass-reduction cutout extends through the lamination nested within in a V-shape defined by the permanent magnets adjacent to an outer surface of the rotor. The lamination further includes a stress-reduction slot that extends through the outer periphery of the rotor.

Abstract: An axial field rotary energy device can include a rotor having an axis of rotation and a magnet; a stator coaxial with the rotor, the stator can have a printed circuit board (PCB) having a plurality of PCB layers that are spaced apart in an axial direction, each PCB layer can include a coil having only two terminals for electrical connections, each coil is continuous and uninterrupted between its only two terminals, each coil consists of a single electrical phase, and one of the two terminals of each coil is electrically coupled to another coil with a via to define a coil pair; and each coil pair is electrically coupled to another coil pair with another via.

Abstract: A method for manufacturing a laminate used for manufacturing a rotor is provided. The method includes: (a) stamping out a plurality of workpieces from a metal sheet wherein each of the workpieces has a temporarily-interlocking portion; and (b) obtaining a laminate including the workpieces integrated together by the temporarily-interlocking portion, wherein each of the workpieces further has a shaft hole, a magnet insertion hole, and a weight-reducing hole formed between the shaft hole and the magnet insertion hole, and the temporarily-interlocking portion is provided to the weight-reducing hole.

Abstract: According to some aspects of the present disclosure, example stator assemblies for three phase dynamoelectric machines and related winding methods are disclosed. An example stator assembly generally includes a non-segmented stator core including a stator yoke and a plurality of teeth. The stator assembly also includes a plurality of coil portions electrically coupled in a delta winding pattern, and including a first coil portion extending around a first one of the plurality of teeth and a second coil portion extending around a second one of the plurality of teeth. The stator assembly further includes a plurality of connection portions including a first connection portion extending between the first coil portion and the second coil portion and electrically coupling the first coil portion and the second coil portion. The first coil portion, the second coil portion and the first connection portion are defined by a continuous length of winding wire.

Abstract: A three-phase electromagnetic motor includes: a stator that is formed by winding a winding around a magnetic pole formed between slots of a stator core; and a rotor that is disposed inside the stator and has a permanent magnet. The three-phase electromagnetic motor is formed of 8n poles and 6n slots (n is a natural number). 3n windings are wound around every other magnetic pole among a plurality of magnetic poles of the stator core.

Abstract: 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 (3); mounting the core (3) on a rotating jig (10); forming a magnet piece (2p) into a predetermined shape by sintering; mounting a predetermined number of the magnet pieces (2p) on a regulating jig (20); pressing the magnet pieces (2p) by the regulating jig (20) while rotating the core (3) by the rotating jig (10), to thereby mount the magnet pieces (2p) on the core (3); and adjusting an axial position of the magnet piece (2p) so that an axial end surface of the core (3) and an axial end surface of the magnet piece (2p) are aligned with each other.

Abstract: A method of manufacturing a rotor according to the present invention includes: a process of stacking a plurality of electromagnetic steel plates on a jig 30 to fix the electromagnetic steel plates to the jig 30, and a process of inserting magnets 21 into a plurality of respective openings 11 included in a rotor core 10 in which the plurality of electromagnetic steel plates are stacked on one another. The magnets 21 are inserted into the respective openings 11 while a structure 80 including the rotor core 10 and the jig 30 is vibrated at a resonance frequency of the structure 80.

Abstract: A rotating electric machine including a rotator including a small-angle rotator portion and a large-angle rotator portion respectively having different inter-magnet end angles, each being a plane angle formed between a line connecting one outermost peripheral-side end of a permanent magnet and an axial center of the rotator and a line connecting an outermost peripheral-side end of another permanent magnet and the axial center of the rotator. The rotator includes three layers of the small-angle rotator portion, the large-angle rotator portion, and the small-angle rotator portion, which are laminated in the stated order along an axial line of the rotator. Therefore, demagnetization due to a temperature rise of the permanent magnets is suppressed. In addition, a temperature distribution in the permanent magnets in the axial direction of the rotator is reduced.

Abstract: An interior permanent magnet motor includes: a rotor; a stator; and a plurality of permanent magnets respectively inserted into a plurality of magnet insertion holes formed in a rotor core, the rotor core being formed by laminating a plurality of magnetic steel sheets, the magnetic steel sheets including first magnetic steel sheets each not having a magnet stopper in the magnet insertion hole, and second magnetic steel sheets each having magnet stoppers at both end portions of the magnet insertion hole, the rotor core including a laminate of the magnetic steel sheets in a lamination mode in which, when Hn represents a distance between an upper end surface of the second magnetic steel sheet and an upper end surface of the n-th second magnetic steel sheet, a progression of differences of Hn is a geometric progression.

Abstract: A motor control device includes a motor, a control device, and a motor drive circuit. The motor includes a motor rotor, a motor stator, and a plurality of coil groups divided into a first coil group and a second coil group of at least two systems for each of three phases, and configured to excite a stator core by three-phase alternating currents. In the motor drive circuit, a first motor drive circuit supplies a three-phase AC first motor drive current to the first coil group based on a command value, and a second motor drive circuit supplies a three-phase AC second motor drive current having a phase difference from a phase of the first motor drive current, to the second coil group.

Abstract: An electric motor apparatus comprises a rotor and a stator formed of at least two stator components, each of the at least two stator components having a substantially hollow cylindrical form. The rotor is mounted within the at least two stator components on a rotational mounting such that the rotor can rotate about a longitudinal central axis with respect to the stator. Each of the at least two stator components has at least two protrusions arranged at different circumferential points on an inner surface of the at least two stator components. Each protrusion has a winding mounted thereon. Control circuitry generates control signals to control power supplied to the windings on each stator component such that power can be controlled to each stator component independently.