A rotor structure of a magnet motor includes a rotating shaft and an iron core on the rotating shaft. Magnet grooves are disposed inside the iron core along a circumferential direction with a magnet provided therein. A distance between an edge line of the magnet groove close to a circumferential edge of the iron core and the circumferential edge of the iron core varies so that a width of a flux barrier formed varies. One end of a long side of the magnet groove close to the circumferential edge is formed with an anti-demagnetization groove communicating with the magnet groove, and an edge line of the anti-demagnetization groove tilts toward the circumferential edge of the iron core. Process slots are provided between the magnet grooves and the circumferential edge of the iron core that are used to increase a salient rate and reluctance torque of the motor.

A rotor for a rotary electric machine includes a rotor core in which a plurality of magnetic pole portions is provided. Each of the magnetic pole portions includes: a magnet insertion hole into which a permanent magnet is inserted. A d-axis-side space portion is provided inside the magnet insertion hole between the d-axis-side end portion of the permanent magnet and the d-axis-side end portion of the magnet insertion hole, and a q-axis-side space portion penetrating in the axial direction is provided inside the magnet insertion hole between the q-axis-side end portion of the permanent magnet and the q-axis-side end portion of the magnet insertion hole. The permanent magnet further includes: a first communication portion communicating the d-axis-side end portion with the q-axis-side end portion; and a second communication portion communicating the d-axis-side end portion with the q-axis-side end portion.

A technique by which the magnetic flux of the magnetic pole facing the stator of the magnet can be further increased in a rotor, is provided. An electric motor according to the present disclosure includes a stator 10; a rotor 20 facing the stator 10 in an axial direction (first direction) and configured to be rotatable in a circumferential direction (second direction) that is orthogonal to the axial direction; and a short-circuit reduction member 25, 26, wherein the rotor 20 includes a main magnet 22 having a first magnetic pole on a surface facing the stator 10; an auxiliary magnet 23, 24 arranged adjacent to the main magnet 22 and having a second magnetic pole and a third magnetic pole that is different in polarity from the second magnetic pole, and configured to increase a magnetic flux of the first magnetic pole, and wherein the auxiliary magnet 23, 24 is arranged adjacent to the main magnet 22 in a radial direction (third direction) that is orthogonal to the axial direction, and the short-circuit reduction member 25, 26 is provided at a portion around the auxiliary magnet 23, 24 facing the auxiliary magnet 23, 24 in parallel with a virtual line connecting the second magnetic pole and the third magnetic pole, to reduce a short-circuit of a magnetic flux between the second magnetic pole and the third magnetic pole.

A rotor includes a rotor core. A permanent magnet constitutes a first magnetic pole, and a part of the rotor core constitutes a second magnetic pole. In the second magnetic pole, a plurality of slits is symmetrically formed with respect to a magnetic pole center line connecting a pole center of the second magnetic pole and the center axis. On one side of the magnetic pole center line in a circumferential direction about the center axis, the plurality of slits has a first slit closest to the magnetic pole center line and a second slit adjacent to the first slit in the circumferential direction. A minimum distance L1 from the first slit to the outer circumference of the rotor core and a minimum distance L2 from the second slit to the outer circumference of the rotor core satisfy L1<L2.

A rotor for an electric machine includes a heat pipe cooling system. A rotor core has a number of cavities internal to the rotor core. The cavities are surrounded by a wall defined by the rotor core. A magnetic element disposed in the at least one cavity leaving a void in the at least one cavity between the magnetic element and the wall. A heat pipe evaporator is disposed in the void and conforms to the available space, contacting the magnetic element and the wall to remove heat from the rotor core.

Rotor structure, permanent magnet auxiliary synchronous reluctance motor and electric vehicle. The rotor structure includes: a rotor body provided with a permanent magnet slot group, the permanent magnet slot group including a permanent magnet slot, a first segment and a second segment of the permanent magnet slot being arranged to extend towards an outer edge of the rotor body, and an intermediate portion of the permanent magnet slot being arranged to protrude towards a side where a shaft hole of the rotor body is disposed; and a permanent magnet arranged in the permanent magnet slot, the permanent magnet including a plurality of permanent magnet segments, and partial lengths of the permanent magnet segments gradually decreasing outwards along a radial direction of the rotor body.

A rotating electrical machine capable of obtaining a higher torque while minimizing the amount of permanent magnets used. A rotor core includes a plurality of first insertion holes each having an auxiliary magnet embedded therein, the auxiliary magnet being embedded so as to surround a rotation axis of a rotor in a cross-section orthogonal to the rotation axis. The rotor core includes a plurality of second insertion holes each having a main magnet embedded therein, the main magnet being embedded so as to extend from the auxiliary magnet toward an outer circumferential direction of the rotor. The rotor includes a plurality of magnetic poles formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets. The auxiliary magnet is arranged disproportionately on one side of the first insertion hole in the circumferential direction of the rotor so as to form a clearance on the other side of the first insertion hole.

A rotating electrical machine according to one aspect of the present invention includes: a rotor rotatable about a central axis; and a stator located radially outside the rotor. The rotor includes: a rotor core that includes a plurality of electromagnetic steel plates laminated in an axial direction and that has a plurality of accommodation holes; and a plurality of magnets respectively accommodated in the plurality of accommodation holes. The rotor core includes: a first recess recessed from a first core end face on a first axial side to a second axial side; a first swaged part provided on a bottom surface of the first recess; and a first protrusion that protrudes toward each of the magnets in a direction in which an inner peripheral edge of each of the accommodation holes intersects an axial direction, the first protrusion butting against a side face of the magnet.

The rotating electrical machine includes a rotor that has a rotor core, a key portion formed protruding in a radial direction from an inner peripheral face of the rotor core, a stress relaxing groove, which is provided at both ends of the key portion and is formed recessed farther to a radial direction outer side than the inner peripheral face of the rotor core, and a multiple of balancing holes provided one each between each pair of a multiple of magnetic poles of the rotor core, wherein lengths from a center of the rotor core to a center of each of the multiple of balancing holes are such that a length of a first straight line that passes through a center of the key portion is less than a length of an nth straight line that intersects with the first straight line vertically.

A rotor core rotatable about an axis has: a pair of first magnet holes; a pair of second magnet holes radially outside the first magnet holes; and first and second through holes axially penetrating the rotor core and positioned radially inside the first magnet holes. When viewed along the axis, an opening edge of each of the first and second through holes includes a first straight portion extending radially, a second straight portion extending toward a circumferential side from a radially inner end of the first straight portion, a third straight portion extending radially outward from an end of the second straight portion, a first curved portion extending toward a circumferential side from a radially outer end of the first straight portion, and a second curved portion connecting an end on a circumferential side of the first curved portion and a radially outer end of the third straight portion.