A rotor for an electric machine, includes a rotor lamination stack divided into a plurality of sectors, in each of which there is arranged a permanent magnet assembly which comprises two permanent magnets positioned in a V-shape symmetrically with respect to a plane of symmetry dividing the sector into two half-sectors, wherein an outer radius of the rotor lamination stack in a particular sector has a pair of local minimum values, which are formed symmetrically to one another with respect to the plane of symmetry in a half-sector of the sector.

A motor includes a rotor and a stator. The stator is formed by laminating a plurality of magnetic thin strips each having a plurality of teeth parts. The magnetic thin strip includes an elliptical-shaped inner diameter part formed along tip end portions of the plural teeth parts. At least one magnetic thin strip in the laminated magnetic thin strips is shifted by a given angle with respect to other magnetic thin strips in a horizontal direction, and positions of all teeth parts of the laminated magnetic thin strips correspond to one another to reduce cogging torque.

A brushless direct current motor includes a rotor made up of at least one permanent magnet and a stator having at least three partitions radially extending from a circular based cylindrical main body, the partitions together defining at least two volumes for receiving at least three coils generating a magnetic field, wherein each volume is closed by a wall connecting the partitions, and in that the wall comprises, on the face thereof oriented toward the rotor, at least one magnetic restriction zone. A sleeve surrounds the stator and the rotor and has at least one deformation zone formed by cutouts adapted to maintain the external geometrical configuration of the sleeve when mounting the constituent elements of the motor. A method for manufacturing such a motor.

A brushless direct current motor includes a rotor made up of at least one permanent magnet and a stator having at least three partitions radially extending from a circular based cylindrical main body, the partitions together defining at least two volumes for receiving at least three coils generating a magnetic field, wherein each volume is closed by a wall connecting the partitions, and in that the wall comprises, on the face thereof oriented toward the rotor, at least one magnetic restriction zone. A sleeve surrounds the stator and the rotor and has at least one deformation zone formed by cutouts adapted to maintain the external geometrical configuration of the sleeve when mounting the constituent elements of the motor. A method for manufacturing such a motor.

A flux concentrate type rotor may include a shaft; a rotor core; and an arc type permanent magnet having an inner diameter portion and an outer diameter portion. The rotor core includes an annular ring-shaped inner diameter portion core having a shaft through hole, a plurality of outer diameter portion cores arranged along a circumferential direction of the inner diameter portion core on an outer circumferential surface of the inner diameter portion core, and spaced apart from each other to form permanent magnet insertion portion, and a plurality of bridges arranged along the circumferential direction of the inner diameter portion core to correspond to each of the outer diameter portion cores, and connect each of the outer diameter portion cores to the inner diameter portion core. The outer diameter portion core has a first cutout portion positioned at a lower end.

A rotary electric machine comprises: a rotor which has a rotor core and permanent magnets arranged in the rotor core on its outer circumference side, and which is supported rotatably; and a stator which has a stator core having teeth projecting toward a radial center and arranged circumferentially, and which is located coaxially with the rotor to be spaced apart from the outer circumferential surface of the rotor; wherein, on a condition that a ratio of the circumferential width of each of sub poles to the circumferential width of each of main poles is 0.625 or less, a top width of each of the teeth is set on the basis of two calculation formulas to be used differently according to the rotor skew angle.

An example system includes a dynamo-electric machine. The dynamo-electric machine includes a rotor that is cylindrical and that is configured for rotation and a stator that is arranged relative to the rotor. The stator has a stepped configuration that defines a first diameter for the stator and a second diameter for the stator. The first diameter is greater than the second diameter. Zones of the stator at the first diameter hold direct-axis (D-axis) windings and zones of the stator at the second diameter hold quadrature axis (Q-axis) windings. An airgap between the rotor and the Q-axis windings is greater than an airgap between the rotor and the D-axis windings.

An example system includes a dynamo-electric machine. The dynamo-electric machine includes a rotor that is cylindrical and that is configured for rotation and a stator that is arranged relative to the rotor. The stator has a stepped configuration that defines a first diameter for the stator and a second diameter for the stator. The first diameter is greater than the second diameter. Zones of the stator at the first diameter hold direct-axis (D-axis) windings and zones of the stator at the second diameter hold quadrature axis (Q-axis) windings. An airgap between the rotor and the Q-axis windings is greater than an airgap between the rotor and the D-axis windings.

Disclosed are a rotor structure, a permanent magnet auxiliary synchronous reluctance motor, and an electric vehicle. The rotor structure includes a rotor body; the rotor body is provided with permanent magnet slot groups each including multiple layers of permanent magnet slots; the multiple layers of permanent magnet slots include a first permanent magnet slot; and the first permanent magnet slot includes a first permanent magnet slot section and a first bent slot. A first end of the first bent slot is connected to a second end of the first permanent magnet slot section, a second end of the first bent slot is arranged to extend toward an outer edge of the rotor body.

Disclosed are a rotor structure, a permanent magnet auxiliary synchronous reluctance motor, and an electric vehicle. The rotor structure includes a rotor body; the rotor body is provided with permanent magnet slot groups each including multiple layers of permanent magnet slots; the multiple layers of permanent magnet slots include a first permanent magnet slot; and the first permanent magnet slot includes a first permanent magnet slot section and a first bent slot. A first end of the first bent slot is connected to a second end of the first permanent magnet slot section, a second end of the first bent slot is arranged to extend toward an outer edge of the rotor body.