Abstract: A rotary electric machine includes a rotor, and a stator. The rotor includes poles having slots and magnets. Each of the slots includes a first housing hole, a pair of second housing holes, a pair of first ribs, a pair of second ribs, and an area of a first space. The first housing hole is disposed near an outer periphery of the rotor to be substantially parallel with an outer peripheral surface of the rotor. The pair of second housing holes are provided symmetrically with respect to the first housing hole to be inclined toward the outer periphery away from the first housing hole. The pair of first ribs are each provided between the first housing hole and each of the pair of second housing holes. The pair of first ribs are each provided between the first housing hole and each of the pair of second housing holes.

Abstract: A rotor (1) for an electric machine, in particular a permanently excited synchronous machine. At least one recess (20) is formed on the outer wall (12) of the receiving space (6) and forms a non-magnetizable space (29) adjacent to the lengthwise surface (10) of the permanent magnet (7). Due to this non-magnetizable space (29), iron losses in the stator teeth can be reduced in particular during operation of the electric machine in the field weakening range, which may result in a rise in efficacy of up to 3% for the electric machine.

Abstract: Provided is an electric motor in which magnets are reduced in size, thus achieving a reduction in cost, and in which a magnetic torque and a reluctance torque are effectively used by adjusting the magnetic flux density to improve the efficiency, thus achieving a reduction in size and cost. The electric motor is equipped with a rotor that includes a cylindrical rotor iron core in which main magnetic poles and auxiliary magnetic poles are alternately disposed in the circumferential direction, a substantially V-shaped magnet insertion hole that is provided for each of the main magnetic poles and whose convex portion faces a rotor center and is centered on a d-axis passing through the rotor center and the circumference-wise center of the main magnetic pole, and two magnets per pole that are embedded in the magnet insertion hole in a substantially V-shaped manner.

Abstract: A permanent magnet embedded motor includes a rotor and permanent magnets. The outer circumferential surface of the rotor is formed by divided outer circumferential surfaces divided at equal angle intervals in a circumferential direction corresponding to permanent magnets. The divided outer circumferential surface is formed by a first curved surface, a radial direction distance of which from a rotor axis is maximized in a circumferential direction center of divided outer circumferential surface and second curved surfaces formed from the circumferential direction both ends to the circumferential direction center and crossing the first curved surface. The second curved surfaces are formed by—arcuate surfaces each having the rotor axis as a central axis. A distance between both ends of the first curved surface is smaller than the width of a permanent magnet in a direction orthogonal to a radial direction in the circumferential direction center.

Abstract: A rotor structure for a motor includes a shaft, a single magnet and two fixing seats. The single magnet has two opposite end faces. An axial hole has a maximum extent equal to a maximum extent between the two opposite end faces. At least one of the two opposite end faces has a first engaging member. The magnet and each opposite end face have a maximum radial extent. Each fixing seat includes an abutting face having a maximum radial extent the same as the maximum radial extent of the single magnet and of the opposite end faces. One of the abutting faces has a second engaging member. The first engaging member is located at the maximum radial extent at the outer edge of the at least one of the two opposite end faces, or located at the inner edge of the at least one of the two opposite end faces.

Abstract: A rotor includes a rotor core having a plurality of pairs of magnet-receiving holes and a plurality of magnets respectively received in the magnet-receiving holes. Each pair of the magnet-receiving holes is arranged in a substantially V-shape opening radially outward and a center bridge formed between the two magnet-receiving holes of the pair. For each of the magnet-receiving holes, a protrusion is formed, at a position closer to a radially outer end than a radially inner end of the center bridge, so as to protrude from the center bridge inward of the magnet-receiving hole. Moreover, a magnetic flux barrier is formed at a radially innermost corner portion of the magnet-receiving hole and defined by a curved surface that includes three or more single-curvature surfaces having different curvatures. Among the single-curvature surfaces, the single-curvature surface which has the minimum curvature is positioned closest to the longitudinal axis of the rotor core.

Abstract: A rotating electric machine includes a stator having a stator coil and a rotor provided rotatably around a specific rotation axis with respect to the stator. The rotor includes a plurality of magnets, a plurality of magnetically-assisted salient pole members provided between poles of any adjacent two magnets from among the plurality of magnets, and a magnetoresistance variation unit provided in the magnetically-assisted salient pole member along an axial direction of the rotation axis at a position offset in a circumferential direction of the rotation axis from a q-axis passing through a salient pole center of the magnetically-assisted salient pole member. The amount of offset of the magnetoresistance variation unit from the q-axis varies depending on positions of the magnetically-assisted salient pole members so that torque fluctuations cancel each other when power is applied.

Abstract: A drive system powers a six-phase AC induction motor having a plurality of poles and a stator with a plurality of teeth where the number of teeth divided by six times the number of poles equals an integer number. The stator core has first and second groups of three-phase stator windings. The second group of three-phase windings is separated spatially by 30 electrical degrees from the first group. A first power supply is connectable to the first group of three-phase windings. A second power supply is connectable to the second group of three-phase windings. The second power supply provides power to the second group of three-phase windings that is shifted by 30 electrical degrees in time with respect to the first power supply. The first and second power supplies receive signals from identical pulse width modulator generators. The respective first and second pulse width modulator generators receive commands from one controller.

Abstract: A rotor, constituting an interior permanent magnet motor, includes magnets that are inserted into the rotor, and a rotor core containing magnet insertion pockets to which the magnets are inserted, and, when the magnets are inserted, the magnet insertion pockets are formed to provide openings in areas except both ends of an inner circumferential face, at both ends in a circumferential direction of the magnets.

Abstract: A rotating element with embedded permanent magnets is provided that includes: a rotor core adapted to be within the diameter direction of a stator; first permanent magnets embedded near the exterior circumference face of the core, and orthogonally extending with a d axis; and second permanent magnets embedded on both sides of each of the first magnets, and extending along a q axis. The rotating element further includes gaps formed in the core away from both circumference direction ends of the first magnets. The gaps further include exterior end parts at the furthermost exterior side with respect to the diameter direction of the core, and interior end parts at the furthermost interior side with respect to same. The magnetic pole faces of the first magnets are located between the exterior and interior end parts of the gaps.

Abstract: A squirrel-cage rotor includes a laminated core provided on an outer circumference of a rotational axis, and a plurality of slots formed in the laminated core in a circumferential direction, so as to be spaced apart from each other. The cross-section shape of each slot includes an inner circumferential edge and an outer circumferential edge extending in the circumferential direction so as to face each other, and a first side portion and a second side portion extending in a radial direction so as to face each other. The radius of curvature of the inner circumferential edge is larger than that of corners on an inner circumferential side of the slot. The radius of curvature of the outer circumferential edge is larger than that of corners on an outer circumferential side of the slot.

Abstract: A rotor, constituting an interior permanent magnet motor, includes magnets that are inserted into the rotor, and a rotor core containing magnet insertion pockets to which the magnets are inserted, and, when the magnets are inserted, the magnet insertion pockets are formed to provide openings in areas except both ends of an inner circumferential face, at both ends in a circumferential direction of the magnets.

Abstract: The disclosure discloses a rotating electrical machine including a stator and a rotor. The rotor includes a cylindrical iron core that is fixed to a shaft and comprises a radial direction and an axial direction, a plurality of permanent magnets that is embedded in the iron core, a plurality of air gaps that are respectively provided in a portion on an inner side of the iron core in the radial direction, a wedge portion that is provided along the axial direction so as to protrude within the air gap, and a non-magnetic reinforcing member that is filled in the air gap.

Abstract: A current vector controlled synchronous reluctance motor and control method thereof, wherein the motor has a coil on each of the teeth. The coils form a U-phase winding, a V-phase winding and a W-phase winding. The phase windings receive a balanced three-phase current vector to induce closed magnetic field lines, such that the coils induce same magnetic poles adjacent to the rotor unit. Two short magnetic routes are formed along three adjacent teeth and the rotor unit. The efficiency of the reluctance motor is high.

Abstract: A rotor includes a rotor core having a plurality of pairs of magnet-receiving holes and a plurality of magnets respectively received in the magnet-receiving holes. Each pair of the magnet-receiving holes is arranged in a substantially V-shape that opens toward a stator side. The rotor core has, for each of the magnet-receiving holes, a magnetic flux barrier that is formed, at a magnetic pole centerline-side end of a stator-side wall surface of the magnet-receiving hole, so as to protrude from the stator-side wall surface toward the stator side. The protruding height H of the magnetic flux barrier from the stator-side wall surface is set to be in the following range: 0.12×R?H?0.29×R, where R is the minimum distance from an intersection P1, which is between the magnetic pole centerline and a rotor-side circumferential surface of the stator, to the stator-side wall surface of the magnet receiving hole.

Abstract: A cylindrical rotor core 10 for a rotating electrical machine having magnetic steel plates integrally connected by laminating in an axial direction, and having magnet insertion holes 24, 26 formed for inserting permanent magnets inside, wherein the magnet insertion holes 24, 26 are formed extending in the axial direction in a core inner section in the vicinity of an outer peripheral surface 11c of the rotor core 10, and with openings formed in axial direction end sections of the rotor core 10, and a plurality of magnetic steel plates, including magnetic steel plates at outermost sides in the axial direction in which the openings are formed, are fixed by welding at inner wall surfaces 42 of the magnet insertion holes 24, 26.

Abstract: A rotor core for an internal permanent magnet machine includes at least one ferrite pole and at least one rare earth pole, arranged radially about an axis in alternating relationship. The ferrite poles define a plurality of first pole cavities, and the rare earth poles define a plurality of second pole cavities. One of a plurality of ferrite magnets is disposed within each of the first pole cavities of the ferrite poles, and one of a plurality of rare earth magnets is disposed within each of the second pole cavities of the rare earth poles.

Abstract: A motor includes a cylindrical stator having a hollow, and a rotor rotatably arranged inside the stator. The rotor includes a cylindrical rotor body, a permanent magnet group provided to the rotor body to generate a magnetic field, and a flux barrier group to interrupt magnetic flux. The rotor body, the permanent magnet group and the flux barrier group are asymmetrically formed with respect to a center of poles of the rotor.

Abstract: There is provided a motor including a rotor and a stator arranged outside the rotor in the radial direction. The rotor includes a rotor core, a plurality of magnets arranged at equal intervals in the circumferential direction of the rotor core and functioning as one magnetic pole, and salient poles integrated with the rotor core, each arranged between adjacent magnets and at a distance from the magnets. The salient poles function as the other magnetic pole. A stator has a stator core having a plurality of teeth extending in the radial direction of the stator and arranged at equal intervals in the circumferential direction, and multi-phase coils attached to the teeth.

Abstract: A rotary electric machine includes a rotor core in which first magnetic pole portions having permanent magnets and second magnetic pole portions having no permanent magnets are alternately arranged in a circumferential direction; and a stator core which is arranged to face an outer periphery of the rotor core. The rotor core is configured such that an average gap length between the stator core and the second magnetic pole portions is larger than an average gap length between the stator core and the first magnetic pole portions.

Abstract: A rotating electrical machine includes a rotor which has a rotor core formed by stacking magnetic plates having an annular plate shape in an axial direction, a permanent magnet is inserted into a magnet insertion hole formed in the rotor core, and a rotor shaft is inserted into a shaft insertion hole surrounded by an inner peripheral surface of the rotor core; and a stator. A radial communication passage is formed by a communication penetration hole group that is formed by sequentially communicating a plurality of the penetration holes from a shaft insertion hole to a magnetic resistance hole in the radial direction. The plurality of the penetration holes are divided into at least two specific magnetic plates and formed such that the radial positions of the penetration holes are different from each other and the penetration holes partially overlap each other when viewed in the axial direction.

Abstract: A method produces a rotor which can rotate about a rotation axis, in particular for an electrical machine of a motor vehicle. At least two rotor body elements are each provided with a number of receiving pockets which are made in an axial direction. Magnet bodies are in each case pressed into the receiving pockets in the rotor body elements with an axial press-in direction. The rotor body elements are joined to one another in such a way that the press-in directions of the magnet bodies point away from one another. Additionally, an electrical machine has a rotor which is produced in this manner.

Abstract: A rotary electric machine includes a stator and a rotor. The rotor has at least one permanent magnet arranged in a d-axis magnetic path. The rotor includes a magnetic gap part located between the permanent magnet arranged in the d-axis magnetic path of one pole and an adjacent magnet with a different polarity, such that a d-axis magnetic flux forms a d-axis bypass passing through an area other than the permanent magnet. The d-axis bypass provides a magnetic resistance in a d-axis direction that is set below a magnetic resistance in a q-axis direction that is orthogonal to the d-axis resistance.

Abstract: In a permanent-magnet-embedded electric motor, at the distal ends of base sections of teeth sections of a stator core, increased magnetic-resistance sections, which have magnetic resistance larger than magnetic resistance of the base sections, are provided. Given that a minimum interval in the circumferential direction between the base sections adjacent to each other is represented as La, an interval of a minimum gap between the teeth sections adjacent to each other is represented as Lb, and an interval of a gap between a rotor and a stator is represented as Lg, a relation of La>2Lg>Lb holds. Due to such a configuration, it is possible to provide the electric motor that does not spoil a magnetic characteristic of the rotor and that is excellent in a demagnetization characteristic.

Abstract: A multilayer laminated rotor is mountable on a shaft for rotation relative to a stator of a rotary electric machine arrangement. The rotor has a plurality of laminas, joined together, and voids for receiving magnets. An annular rotor section, which surrounds a shaft opening within which the shaft is receivable, extends between the shaft opening and a radially outer circumferential rotor surface. The annular section mentioned includes an undulating series of the voids in void groups extending from the radially outer circumferential rotor surface inwardly toward the shaft opening and then back toward the radially outer circumferential rotor surface, as well as a solid radially interior portion without any of the voids. Distal voids in the void groups include curved, arcuate, or recurved stress relieving features extending inwardly from radially innermost corner locations of the distal voids.

Abstract: Provided is a rotor core of a motor, the rotor core, the rotor core including a thin disk-shaped rotor core member, a shaft hole penetratively formed at a center of the rotor core member, a shaft press-fitted into the shaft hole, a plurality of magnet insertion holes penetratively formed at a position near to a periphery of the rotor core member for inserted coupling by a magnet, and a magnet fixing unit formed by stacking the rotor core members each at a predetermined height, and press-fitting the shaft into the shaft hole, wherein the rotor core members are stacked at a predetermined height, and the shaft is inserted into the shaft hole.

Abstract: 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. Asymmetry is achieved by placing adjacent permanent magnets or magnet sets on the rotor periphery with different rotor magnetic pole arc angles.

Abstract: A permanent magnet machine, a rotor assembly for the machine, and a pump assembly. The permanent magnet machine includes a stator assembly including a stator core configured to generate a magnetic field and extending along a longitudinal axis with an inner surface defining a cavity and a rotor assembly including a rotor core and a rotor shaft. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further including a plurality of permanent magnets for generating a magnetic field which interacts with the stator magnetic field to produce torque. The permanent magnets configured as one of internal or surface mounted. The rotor assembly also including a plurality of retaining clips configured to retain the plurality of permanent magnets relative to the rotor core. The pump assembly including an electric submersible pump and a permanent magnet motor for driving the pump.

Abstract: An IPM motor for a vacuum pump suitable for use as a motor for a small vacuum pump is provided. The IPM motor for a vacuum pump includes: a rotor core in which a rotor shaft of the vacuum pump is pressed and which also has magnets embedded therein; and a stator core which surrounds the rotor core and around which stator windings are wound. The magnets per pole embedded in the rotor core are each split into two pieces and inserted in respective magnet slots in the rotor core. A hole for stress concentration relaxation is provided at either end of each pair of magnet slots in which permanent magnets split into two pieces are embedded in each pole. The rotor core has a multilayer structure having a plurality of rotor core laminations stacked vertically in an axial direction of the rotor shaft. The rotor core laminations stacked vertically are positioned with a skew angle determined by using the holes for stress concentration relaxation.

Abstract: An electric machine includes a stator core, a rotor core, a shaft and at least one pair of magnets. The stator core surrounds the stator core. The rotor core enfolds the shaft and includes at least one groove. The groove includes a pair of sub-grooves. The sub-grooves define an angle ? therebetween. The angle ? satisfies: ?<180°. The magnets are respectively accommodated in the sub-grooves of the groove.

Abstract: A rotor includes a rotor core fixedly attached to a rotational shaft and having a plurality of hole portions arranged in the circumferential direction, a magnet inserted into a plurality of hole portions each, and a filling portion injected into the hole portion. The filling portion is injected into the hole portion from a gate facing a central part in the width direction of the magnet in the opening of the hole portion.

Abstract: A permanent magnet type rotating electrical machine includes a rotor having a rotor core. Magnet holes circumferentially arranged at regular intervals in the rotor core include pairs of first magnet holes and pairs of second magnet holes. Each pair of first magnet holes are symmetric with respect to an imaginary line extending through a rotor core center. Each pair of second magnet holes are located on a radially inner side of the rotor core and are symmetric with respect to the imaginary line. Each pair of second magnet holes are located on an inner circumferential side of the paired first magnet holes with respect to a radial direction of the rotor core. A first magnet angle made by permanent magnets located in each pair of first magnet holes is larger than a second magnet angle made by permanent magnets located in each pair of second magnet holes.

Abstract: A rotor for a rotary electric machine includes a rotor core being rotatable around a rotational axis. The rotor core includes a plurality of steel plates stacked in a stacking direction. Each of the plurality of steel plates includes a plurality of magnet insertion piece holes, a plurality of through piece holes, a radially inner side annular ring, a radially outer side annular ring, and a plurality of ribs. The plurality of magnet insertion piece holes are provided at every first circumferential space. The plurality of magnet insertion piece holes constitute a plurality of magnet insertion holes in a state in which the plurality of steel plates are stacked in the stacking direction while the plurality of steel plates are rotated by the first circumferential space at every timing at which a predetermined number of the plurality of steel plates are stacked in the stacking direction.

Abstract: A rotor for a permanent-magnet-embedded electric motor includes slit holes each axially formed near opposite ends of a magnetic pole between an outer peripheral face of a rotor core and a magnet insertion hole, and forming a symmetrical shape in an approximately truncated chevron shape along the outer peripheral face of the rotor core, based on a centerline of each of the magnetic poles, wherein a thickness of each of permanent magnets is set to be twice or more of an air gap, a width of a shortest magnetic path in which a distance between the slit hole and the permanent magnet becomes shortest is set to be twice or more of the air gap, and an inclination of the slit hole with respect to a width direction of the permanent magnet orthogonal to a radial direction is set to be in a range from 0 to 30 degrees.

Abstract: An electric motor has a wound stator and a permanent magnet rotor. The rotor includes a shaft, a hub fixed on the shaft, a plurality of rotor core segments and magnets fixed around the hub, and a pair of covers fixed to axial ends of the rotor core segments. The hub and covers are formed on the rotor core segments by inserting molding and one of the covers has openings to allow the magnets to be inserted into spaces formed between adjacent rotor core segments such that the rotor core segments and magnets are alternately arranged in a circumferential direction of the rotor.

Abstract: A rotor adapted for a large permanent magnet rotating machine having high output and demagnetization resistance and the permanent magnet rotating machine are provided. The permanent rotating machine includes 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 includes 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. There is also provided the permanent magnet rotating machine including 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.

Abstract: A rotor includes magnetic pole portions and first and second ferric core portions. The first and second ferric core portions are each located between magnetic pole portions in the circumferential direction of a rotor. A first gap is formed between the first or second ferric core portion and a magnetic pole portion at a first circumferential side. A second gap is formed between the first or second ferric core portion and the magnetic pole portion at a second circumferential side. The first gap has a smaller width than the second gap at the first ferric core portion. The first ferric core portion is inclined toward the first circumferential side. The first gap is larger than the second gap at the second ferric core portion. The second ferric core portion is inclined toward the second circumferential side.

Abstract: Magnetic flux short-circuit preventing slits extend from opposite ends of two permanent magnets in an outer circumferential surface of a rotor toward a center of a magnetic pole. Grooves formed in the outer circumferential surface can be located at a distance from each other symmetrically with respect to the center of the magnetic pole and at a distance from a groove of an adjacent magnetic pole in the outer circumferential surface. Relations are established as ?f=n×?s and ?s=n×?s where ?s designates a pitch of stator winding slots, which pitch is converted into an angle around a rotation center, ?f designates an angle between the magnetic flux short-circuit preventing slits, ?s designates an angle between the grooves, and n designates a predetermined integer. Thereby, a permanent magnet-embedded type rotary electric machine in which the influence of a manufacturing error can be minimized so that cogging torque can be reduced stably.

Abstract: A permanent magnet rotor is described. The permanent magnet rotor includes at least one permanent magnet and a rotor core including a first end and a second end. The rotor core includes at least one inner wall that defines a permanent magnet opening configured to receive the at least one permanent magnet. The rotor core further includes at least one permanent magnet retention feature extending substantially radially from the at least one inner wall and configured to maintain a position of the at least one permanent magnet with respect to the at least one permanent magnet opening.

Abstract: A permanent magnet rotor comprising a rotor rim and a plurality of permanent magnet modules arranged on the outer or inner circumference of the rotor rim, the permanent magnet modules extending generally along an axial direction and being of substantially constant axial-cross section, and comprising a base adapted to be fixed to the rim of the generator rotor, one or more permanent magnets, and one or more pole pieces, wherein the permanent magnet modules comprise an axial cooling channel extending substantially along the length of the modules.

Abstract: An interior permanent magnet motor comprises a rotor assembly disposed within a stator assembly. The rotor assembly is configured for rotating about a central axis relatively to the stator assembly. The rotor assembly defines a plurality of magnet pockets within the rotor assembly along a radially outboard surface of the rotor assembly. Each magnet pocket is substantially rectangular in cross-sectional shape, and each magnet pocket is configured to facilitate insertion of a plurality of permanent magnets into and retention of the plurality of permanent magnets within, the magnet pocket. The rotor assembly further comprises a plurality of permanent magnet segments disposed in each magnet pocket.

Abstract: A wind turbine rotary electric machine having a rotor, which rotates about a designated axis and has a rotary body; a plurality of permanent magnets fitted to the rotary body; a plurality of cooling channels close to the permanent magnets; and a plurality of heat-conducting bodies, each located partly contacting at least one permanent magnet and partly inside a cooling channel.

Abstract: A rotor core according to an embodiment includes a pair of magnet openings disposed such that a space therebetween widens toward an outer peripheral side and in which a pair of permanent magnets having a magnetic pole direction relative to a radial direction identical to each other are inserted. The magnet openings each have a shape that connects together a first opening portion formed along the profile of the corresponding permanent magnet and a second opening portion that, when the permanent magnet is inserted in the first opening portion, covers, out of corner portions of the permanent magnet, a corner portion closest to the other permanent magnet with an air gap defined therebetween. The second opening portion forms a bridge portion between the second opening portion and the second opening portion of the other magnet opening.

Abstract: A rotor of a permanent magnet embedded motor includes a rotor iron core formed by stacking a predetermined number of magnetic steel sheets punched into predetermined shapes, a plurality of permanent-magnet insertion holes formed along an outer circumferential portion of the rotor iron core and each including permanent-magnet end-portion cavities on its both ends, a plurality of permanent magnets inserted into the permanent-magnet insertion holes, and a plurality of slits formed in the outer-peripheral side iron core portion outside of each permanent-magnet insertion holes, wherein a distance between a first slit present in a radial direction of each of the end portions of the permanent magnets and a second slit, which is adjacent to the first slit and closer to the center of its magnetic pole, is smaller than a distance between those slits other than the first and second slits.

Abstract: An interior permanent magnet machine includes a rotor having a plurality of slots. First and second slots are disposed in a first pole and the third and fourth slots are disposed in a second pole. A first barrier is defined by the first, second, third and fourth slots. The slots are configured to be symmetric relative to their respective pole axes. A first angle is defined between the first and second slots. A second angle is defined between the third and fourth slots. The first angle is configured to be sufficiently different from the second angle so that torque ripple is minimized. Thus the rotor is configured such that the angular configuration of slots in a first pole is different from the angular configuration of slots in a second pole of the rotor.

Abstract: The present disclosure provides a brushless permanent magnet machine which includes an essentially circular shaped rotor, and a pair of magnets arranged in the rotor. The magnets are each U-shaped and have a thickness direction extending along a contour of the corresponding magnet between the opposite poles of the corresponding magnet, respectively. The magnets are each composed of a non-rare earth material having a lower coercivity than a rare earth material. A direction of magnetization of each of the pair of magnets is parallel to the thickness direction of the corresponding magnet. The present disclosure also provides a method of manufacturing such a brushless permanent magnet machine.

Abstract: An interior permanent magnet machine includes a rotor formed with a plurality of slots that are substantially arc-shaped and referred to herein as arc segments. A first layer of arc segments are disposed in a first pole. The first layer defines a first configuration relative to a first arc center. A second layer of arc segments are disposed in a second pole. The second layer defines a second configuration relative to a second arc center. The rotor is configured such that the first configuration is different from the second configuration, thereby exhibiting pole-to-pole asymmetry. The first configuration is sufficiently different from the second configuration such that torque ripple may be minimized. In one embodiment, the first layer includes first, second and third arc segments. The rotor may be configured such that the second arc segment is radially offset relative to the first and third arc segments.

Abstract: In the regions around a magnetic shielding space, curved portions and having a rounded shape, which protrude toward the interior space of a magnetic shielding space, are formed at ends of a first side and a second side close to a first end and a second end of an outer-periphery side. In the vicinity of angular portions and of the magnetic shielding space that are positioned at both ends of the outer-periphery side, the magnetic flux density for a given cross-sectional area of a channel through which a short-circuit magnetic flux flows is reduced, and thus, the level of the short-circuit magnetic flux is reduced.

Abstract: A synchronous electric machine having a fixed stator, a multi-phase stator winding and having a rotor which has poles, excited in a predefined sequence, over its circumference, the number of poles being changeable as a function of the intensity and the direction of a field current in at least one field coil of the rotor. For improving the efficiency of the machine and for reducing the number of field coils and the entire coil cross section it is provided that the rotor has a laminated core, laminated in the axial direction, which has grooves on the circumference for accommodating the at least one field coil and that the at least one field coil is situated on the circumference of the rotor with a step size which corresponds to the pole pitch of the lower number of poles.

Abstract: There is provided a rotor core which increases the quality and reliability thereof by preventing the occurrence of a core separation of the rotor core. There is provided a rotor core including a plurality of substantially cylindrical core blocks which are stacked on each other; and a plurality of magnets, characterized in that a plurality of magnet holes extending in an axial direction are provided in the plurality of core blocks so as to extend over the plurality of core blocks in that the plurality of magnets are accommodated in each of the plurality of magnet accommodation holes and fixed therein with a resin, and in that an axial position of core block boundary planes where the plurality of core blocks are brought into abutment with each other and an axial position of magnet boundary planes where the plurality of magnets are brought into abutment with each other differ from each other.