An electric machine includes a stator assembly defining a longitudinal axis. The stator assembly includes a substantially cylindrical stator core that is concentric with and extends longitudinally along the longitudinal axis. The stator core includes a stator pole having an inner surface spaced radially outward from the longitudinal axis. The stator pole includes a first aperture extending radially outward from the inner surface of the stator pole. The electric machine also includes a rotor assembly rotatable about the longitudinal axis. The rotor assembly includes a rotatable shaft and a rotor core. The rotor core is concentric with and extends longitudinally along the longitudinal axis. The rotor core also includes a rotor pole including an outer surface spaced radially outward from the longitudinal axis. The outer surface is spaced radially inward from the stator pole inner surface.

An electric machine includes a stator assembly defining a longitudinal axis. The stator assembly includes a substantially cylindrical stator core that is concentric with and extends longitudinally along the longitudinal axis. The stator core includes a stator pole having an inner surface spaced radially outward from the longitudinal axis. The stator pole includes a first aperture extending radially outward from the inner surface of the stator pole. The electric machine also includes a rotor assembly rotatable about the longitudinal axis. The rotor assembly includes a rotatable shaft and a rotor core. The rotor core is concentric with and extends longitudinally along the longitudinal axis. The rotor core also includes a rotor pole including an outer surface spaced radially outward from the longitudinal axis. The outer surface is spaced radially inward from the stator pole inner surface.

A double-stator switched reluctance motor includes an annular rotor, an outer stator disposed outside the rotor, and an inner stator disposed inside the rotor. Phases of the salient poles in a rotational direction of the rotor are different from each other in at least one of a set of first stator salient poles and second stator salient poles and a set of first rotor salient poles and second rotor salient poles.

A synchronous reluctance type rotary electric machine of an embodiment has a rotor core. The rotor core includes a plurality of poles, multi-layered hollow parts having a convex shape toward a side radially inward formed for each pole in cross section, and a bridge formed between each of the hollow parts and an outer circumferential surface thereof. When a boundary between two adjacent poles is a pole boundary, a groove is formed on at least one of both sides sandwiching the pole boundary at positions other than on the pole boundary on the outer circumferential surface of the rotor core.

A synchronous reluctance type rotary electric machine of an embodiment includes, a rotor core, a plurality of conductor bars, short-circuit rings, a stator core, and multiphase armature windings. The rotor core is provided to be rotatable around a rotation axis, and includes multi-layered hollow parts having a convex shape toward a side radially inward formed for each pole in cross section, and a bridge formed between each of the hollow parts and an outer circumferential surface thereof. The plurality of conductor bars are disposed in the respective hollow parts and extend in an axial direction and over approximately entire length of the rotor core. The short-circuit rings connect the plurality of conductor bars together. Then, in all of the hollow parts of a second layer and subsequent layers other than the hollow part of a first layer which is at a position farthest from the rotation axis of the rotor core, the conductor bars are disposed at both end portions thereof close to the bridge at a predetermined distance from the bridge.

A brushless bi-directional electric machine comprises a housing mounting exciting coils, a rotor and a stator, the exciting coils and the stator being stationary with respect to the housing and the rotor mounted for rotation with respect to the housing. The electric machine comprises a controller configured to control an exciting current supplied to the exciting coils.

Aspects of the invention relate to a switched reluctance motor and the reduction of motor torque output ripple by inclusion of flux barriers. The inclusion of flux barriers running parallel to the motor shaft axis located in the appropriate places in either or the rotor and stator can modify the torque profile output of the motor markedly reducing potential vibration problems in a vehicle driveline.

Various embodiments are described herein for a double-rotor switched reluctance machine with segmented rotors. In one example embodiment, the double-rotor switched reluctance machine comprises an interior rotor, an exterior rotor spaced from the interior rotor and concentrically disposed outside the interior rotor, and at least one stator disposed concentrically with the interior rotor and the exterior rotor. The interior rotor, the exterior rotor and the at least one stator are disposed within one machine set to provide an interior switched reluctance machine and an exterior switched reluctance machine. In the various embodiments described herein, at least one of the interior rotor and the exterior rotor comprises an array of magnetically isolated segments and filler segments. The interior switched reluctance machine and the exterior switched reluctance machine can operate as two motors, two generators, or a motor and a generator simultaneously.

A permanent magnet synchronous machine includes a stator including a plurality of split core blocks that are continuously arranged in a rotation direction of a rotor. The plurality of split core blocks each includes: a permanent magnet; a pair of teeth arranged on both ends of the permanent magnet so as to sandwich the permanent magnet in the rotation direction; and connection teeth, which are provided on axial end portions of the pair of teeth sandwiching the permanent magnet, and are configured to connect the pair of teeth.

Various embodiments are described herein for switched reluctance machine configurations. In at least one embodiment, a switched reluctance machine configured according to the teachings herein comprises an axially extending shaft, an axially extending rotor mounted to the shaft, the rotor having a plurality of salient rotor poles, an axially extending stator disposed coaxially and concentrically with the rotor, the stator having a plurality of salient stator poles protruding radially from the stator towards the rotor poles, and a plurality of electrical coils wound about the stator poles to define a plurality of phases of the switched reluctance machine, where a number of rotor poles can be determined according to the following equation and at least one constraint condition:

[00001]$N_r=\frac{\mathrm{LCM}\left(N_s,N_r\right)}{2N_{\mathrm{ph}}}.$