A unique rotor assembly for an electrical machine is disclosed herein. The rotor assembly includes a shaft having an axis of rotation extending within the electrical machine. A central support is connected to the shaft at an intermediate position and a pair of opposing end plates are configured to clamp a plurality of laminate plates therebetween. The laminate plates and a sidewall of the end plates have a non-linear cross-sectional shape such that radial loading due to centrifugal force is transmitted from the laminate plates to the end plates during operation.

A rotary electric machine having a stator, and a rotor having a shaft and permanent magnets on the surface of the shaft, the permanent magnets having a face of concave overall shape directed toward the stator.

A rotary electric machine having a stator, and a rotor having a shaft and permanent magnets on the surface of the shaft, the permanent magnets having a face of concave overall shape directed toward the stator.

A motor includes a stator that includes a stator core and coils. The stator core is formed of a magnetic material and has a plurality of teeth arranged at intervals in a circumferential direction. The coils are formed of electrically-conductive windings wound around the teeth. Moreover, the motor also includes a rotor having a plurality of magnets arranged in radial opposition to the stator core and at intervals in the circumferential direction. The rotor is configured to rotate upon supply of electric current to the coils. Furthermore, the motor also includes a plurality of pseudo-teeth formed of a magnetic material and each located in a circumferentially intermediate area between a circumferentially-adjacent pair of the teeth. The pseudo-teeth are arranged so as to be concentrated in a part of the stator core in the circumferential direction.

A motor includes a stator having a winding, and a rotor. The rotor rotates by receiving a rotational magnetic field generated by drive current supplied to the winding. The winding includes a first winding and a second winding, the first and second windings both being excited at the same timing by the drive current. The first winding and the second winding are connected in series. The rotor includes a first pole section and a second pole section. The second pole section faces the second winding at the rotation position of the rotor at which the first pole section faces the first winding. The magnetic force exerted on the stator by the second pole section is weaker than that exerted by the first pole section.

The present invention provides a rotor plate including a rotating shaft hole and a skew check hole having a skew reference surface which is parallel to a reference line drawn from a center of the rotating shaft hole in a radius direction.

In a rotary dynamo-electric reluctance machine, a rotor includes regions of differing magnetic resistances. One region includes material of a first magnetic conductivity. Another region includes material of a second magnetic conductivity which is lower than the first magnetic conductivity. The region having the second magnetic conductivity includes permanent-magnetic material to increase a torque of the reluctance machine.

A rotor structure of a synchronous motor includes: a stator; and a rotatable rotor on the inner side of the stator, in which the rotor includes: a rotor core fixed to a rotary shaft; and a permanent magnet on the outer side of the rotor core, the permanent magnet on the outer side of the rotor core includes a main magnet and an auxiliary magnet, the auxiliary magnet is provided in contact with the outer side of the rotor core, and the main magnet is provided in contact with the outer side of the auxiliary magnet.

A rotor includes: a shaft; a tubular rotor core; and a plurality of magnets. The shaft extends along a center axis. The rotor core surrounds the shaft. The plurality of magnets is disposed outside the rotor core in a radial direction and is aligned in a circumferential direction. A plurality of first recessed portions recessed outward in the radial direction is aligned in the circumferential direction in an inner surface of the rotor core in the radial direction. Each of the first recessed portions overlaps each of the magnets in the radial direction.

Methods, systems, and mechanical and electromechanical arrangements for field-weakening of an electric machine that utilizes permanent magnets are disclosed herein. One rotor assembly for an electric motor includes a rotor body that moves with respect to a central axis, the rotor body having a core and a number of permanent magnets that move with the rotor body, and the rotor body also having a number of movable field-weakening magnetic materials that move with respect to the permanent magnets and to the central axis.