The present invention may provide a motor including a rotor and a stator disposed to correspond to the rotor, wherein the rotor includes a rotor core and a magnet disposed on the rotor core, a tooth of the stator includes a first surface facing the magnet, the magnet includes a second surface in contact with the rotor core and a third surface which is spaced apart from the second surface and faces the first surface, the third surface includes a flat surface, and a first length which is a shortest distance of the flat surface is in the range of 46% to 50% of a second length of a shortest distance of the first surface.

An electric motor includes a stator core formed by stacking a plurality of electromagnetic steel sheets, a rotor core provided on an inner side of the stator core and formed by stacking a plurality of electromagnetic steel sheets, a rotating shaft having one end side inserted into the rotor core, and an eccentric portion provided on another end side of the rotating shaft and placed in a compression mechanism, in which a length from a center of the rotor core in an axial direction of the rotor core to an end face of the rotor core in the axial direction of the rotor core is shorter than a length from a center of the stator core in an axial direction of the stator core to an end face of the stator core in the axial direction of the stator core.

An apparatus for assembling a permanent magnet motor rotor includes a first-end positioning assembly, a plurality of connectors, and a second-end positioning assembly. The first-end positioning assembly is utilized to fix a first-end rotor core. The second-end positioning assembly is utilized to fix a second-end rotor core. The connectors are utilized to connect and fix the first-end positioning assembly with the second-end positioning assembly. Each first longitudinal axis of each first positioning element of the first end positioning assembly is different from each second longitudinal axis of each second positioning element of the second end positioning assembly. In addition, a method for assembling a permanent magnet motor rotor is also provided.

Disclosed is a rotor for a spoke motor, in which both rare-earth magnets and ferrite magnets are arranged in series, the rare-earth magnet has a smaller size than the ferrite magnet, and a small amount of rare-earth magnet is used, such that manufacturing costs may be greatly reduced, an efficient output may be produced, the motor may produce a higher output than a spoke motor model using only the ferrite magnet, and the motor may use a smaller amount of rare-earth magnet than an IPM type motor model, but may produce an output at a similar level to that of the IPM type motor model.

In the armature winding of a rotary electric machine, in a series coil portion group, the numbers of turns of conducting wire in the coil portions that have an electrical angular phase difference of .sub.k that satisfies .sub.1<.sub.k.sub.m are different than the numbers of turns of conducting wire in the .sub.1 and .sub.m coil portions, and are also different than the numbers of turns of conducting wire in the coil portions that are adjacent to the .sub.k coil portions on two sides in a circumferential direction of the stator core, and phases of the .sub.k coil portions are also different than phases of each of the coil portions that are adjacent to the .sub.k coil portions on the two sides in the circumferential direction.

A rotating electric machine includes a field system, which includes a magnet section, and an armature. The magnet section includes a plurality of magnets that are arranged at predetermined intervals and in alignment with each other in a circumferential direction. The magnets have easy axes of magnetization oriented such that at locations closer to a d-axis, the directions of the easy axes of magnetization are more parallel to the d-axis than at locations closer to a q-axis. In the magnets, magnet magnetic paths are formed along the easy axes of magnetization. The field system further includes a field-system core that is formed of a soft-magnetic material. The field-system core has protrusions protruding to the armature side. Each of the protrusions is located closer to the q-axis than to the d-axis in the circumferential direction. Circumferential end surfaces of the protrusions respectively abut circumferential end surfaces of the magnets.

An electrical system includes a power inverter connected to a battery and outputting a polyphase voltage, and a cycloidal reluctance machine. A machine rotor provides output torque, and is surrounded and separated from the stator by an airgap. The rotor includes permanent magnets providing a fixed-orientation rotor field. The stator includes windings proximate the permanent magnets and electrically connected to the inverter to form stator electromagnets. The rotor field augments the stator field to boost output torque. The rotor is eccentrically positioned with respect to the stator to move with two degrees of freedom (2DOF), including rotating motion and orbiting motion about a center axis of the stator. A rotor constraint mechanism constrains motion of the rotor, such that the rotor is able to generate and transmit the output torque to a coupled load in at least one of the 2DOF.

An electrical system includes a power inverter connected to a battery and outputting a polyphase voltage, and a cycloidal reluctance machine. A machine rotor provides output torque, and is surrounded and separated from the stator by an airgap. The rotor includes permanent magnets providing a fixed-orientation rotor field. The stator includes windings proximate the permanent magnets and electrically connected to the inverter to form stator electromagnets. The rotor field augments the stator field to boost output torque. The rotor is eccentrically positioned with respect to the stator to move with two degrees of freedom (2 DOF), including rotating motion and orbiting motion about a center axis of the stator. A rotor constraint mechanism constrains motion of the rotor, such that the rotor is able to generate and transmit the output torque to a coupled load in at least one of the 2 DOF.

The rotor includes an annular permanent magnet, an annular first iron core situated on the inner diameter side of the magnet, an annular second iron core situated on the inner diameter side of the first iron core, an insulating member situated between the first iron core and the second iron core, and a shaft provided along a central axis of the second iron core, the first iron core is provided with a plurality of outer periphery side convex portions protruding from an inner periphery toward the inner diameter side, the second iron core is provided with a plurality of inner periphery side convex portions protruding from an outer periphery toward the outer diameter side, and the outer periphery side convex portions and the inner periphery side convex portions are disposed in positions not overlapping each other when viewed in the radial direction from the axis of the second iron core.

Provided is a rotor for a permanent magnet rotary electric machine, which enables the bonding of a permanent magnet to a rotor core in a skewed manner with respect to an axial direction of the rotor core. The rotor includes a rotor core including a cylindrical portion and a pair of polygonal columnar portions provided to both ends of the cylindrical portion in the axial direction, and a permanent magnet having a bonding surface, which is flat and bonded to the rotor core. The pair of polygonal columnar portions has flat surfaces that are arranged so that center positions are spaced apart from each other as viewed in the axial direction. The bonding surface of the permanent magnet is bonded to the respective flat surfaces of the pair of polygonal columnar portions under a state in which the permanent magnet is skewed with respect to the axial direction.