A stator that includes an annular stator core having a plurality of slots each having a coil insertion opening that opens in a radial direction, and recesses formed in circumferential side walls and extending in an axial direction; a coil including slot accommodated portions accommodated in the plurality of slots; and a wedge containing a thermoplastic resin and engaged with the recesses so as to close at least a part of the coil insertion opening as viewed in the radial direction of the stator core.

An electric motor and associated systems and methods are described herein. A representative electric motor includes a stator having windings therein, wherein the stator has a diameter and a length greater than the diameter; and a rotor assembly inside the stator, wherein the rotor assembly includes a set of magnets configured to provide six or more poles.

Provided is a covering element for covering a slot between two adjacent teeth of an electromagnetic machine, a stator for an electromagnetic machine and a method of forming a covering element. The covering element comprises a first sub-element and a second sub-element. The first sub-element and the second sub-element are arranged adjacent to each other in a first direction. Further, the second sub-element is made of a different material than the first sub-element.

Provided is a covering element for covering a slot between two adjacent teeth of an electromagnetic machine, a stator for an electromagnetic machine and a method of forming a covering element. The covering element comprises a first sub-element and a second sub-element. The first sub-element and the second sub-element are arranged adjacent to each other in a first direction. Further, the second sub-element is made of a different material than the first sub-element.

Provided is a covering element for covering a slot between two adjacent teeth of an electromagnetic machine, a stator for an electromagnetic machine and a method of forming a covering element. The covering element comprises a first sub-element and a second sub-element. The first sub-element and the second sub-element are arranged adjacent to each other in a first direction. Further, the second sub-element is made of a different material than the first sub-element.

Provided is a covering element for covering a slot between two adjacent teeth of an electromagnetic machine, a stator for an electromagnetic machine and a method of forming a covering element. The covering element comprises a first sub-element and a second sub-element. The first sub-element and the second sub-element are arranged adjacent to each other in a first direction. Further, the second sub-element is made of a different material than the first sub-element.

Fault-tolerant four-phase electric drive systems are provided. One such system comprises: a rotary electric machine having a permanent magnet rotor and an alternate-wound stator having eight evenly-spaced coils arranged in pairs, each coil in each pair being separated by 180 degrees; a first phase (A) comprising a first one of the coil pairs and a first phase drive circuit connected therewith; a second phase (B) separated by +45 degrees from the first phase and comprising a second one of the coil pairs and a second phase drive circuit connected therewith; a third phase (C) separated by +90 degrees from the first phase and comprising a third one of the coil pairs and a third phase drive circuit connected therewith; a fourth phase (D) separated by +135 degrees from the first phase and comprising a fourth one of the coil pairs and a fourth phase drive circuit connected therewith; and a controller connected with the first, second, third and fourth phase drive circuits to control operation thereof.

Fault-tolerant radial flux rotary electric machines are provided. One such machine comprises: a permanent magnet rotor having fourteen poles; and an alternate-wound stator having sixteen slots and four coil pairs, each coil pair forming part of one of four independent electrical phases.

Fault-tolerant radial flux rotary electric machines are provided. One such machine comprises: a permanent magnet rotor having fourteen poles; and an alternate-wound stator having sixteen slots and four coil pairs, each coil pair forming part of one of four independent electrical phases.

A radial-flux rotary electric machine having a first end at one axial extreme and a second end at another axial extreme, comprising: a fluid input for receiving coolant at the first end of the machine; a rotor comprising a radial impeller at the first end of the machine in fluid communication with the fluid input, and a plurality of permanent magnets with a helical fluid conduit thereunder in fluid communication with the impeller; a stator having a plurality of slots with a fill factor of between zero and unity to define axial fluid channels in the slots, the fluid channels being in fluid communication with the helical fluid conduit at the second end of the machine; a fluid output in fluid communication with the fluid channels.