A fluid cooled motor includes a stator, a rotor disposed in the stator rotatably in a circumferential direction, and a stator coil wound on the stator, the stator coil having coil ends extending in an axial direction perpendicular to the circumferential direction. The rotor has a rotor core and annular end plates fixed to axial ends of the rotor core, the annular end plates opposing to the coil ends of the stator coil and being rotatable with the rotor in the circumferential direction. Each of the end plates includes a plurality of flow passages to guide a cooling fluid from an inlet to an outlet thereof in a radially outward direction. Each of the flow passages extends from the inlet to the outlet, and inclines or curves to a direction opposite to a rotation direction of the rotor with respect to a radial direction.

A magnet carrier for carrying magnets in an outer rotor machine, the magnet carrier includes: an axis of rotation A; a hub portion; a tapered portion extending radially outwardly from the hub portion, the tapered portion having an inner side and an outer side, and a radially outer region spaced from the hub; a flange portion extending circumferentially from, and away from, the inner side of the tapered portion. The flange portion has a radially outwardly facing surface and a radially inwardly facing surface, the radially inwardly facing surface for supporting the magnets, and the flange portion having a proximal region and a distal region that are proximal and distal to the tapered portion respectively. The carrier includes a curved corner portion connecting the radially outer region of the tapered portion to the proximal region of the flange portion.

A magnet carrier for carrying magnets in an outer rotor machine, the magnet carrier includes: an axis of rotation A; a hub portion; a tapered portion extending radially outwardly from the hub portion, the tapered portion having an inner side and an outer side, and a radially outer region spaced from the hub; a flange portion extending circumferentially from, and away from, the inner side of the tapered portion. The flange portion has a radially outwardly facing surface and a radially inwardly facing surface, the radially inwardly facing surface for supporting the magnets, and the flange portion having a proximal region and a distal region that are proximal and distal to the tapered portion respectively. The carrier includes a curved corner portion connecting the radially outer region of the tapered portion to the proximal region of the flange portion.

A rotor assembly for an electric motor for a turbomachine defines an axis of rotation. The rotor assembly includes a jacket member that is hollow and that defines an inner radial surface facing inwardly toward the axis of rotation. Furthermore, the rotor assembly includes a magnet member that is received within the jacket member. The magnet member includes an outer radial surface facing outwardly from the axis of rotation. The jacket member is made of a sintered composite material having carbon filament and a sintered matrix. Additionally, the inner radial surface of the jacket member abuts against the outer radial surface of the magnet member to retain the magnet member in a radial position relative to the axis.

A multi-phase electric machine may include a stator, and a rotor for rotating within the stator, the rotor including poles having combination magnet pieces with varying strengths and dimensions creating a non-sinusoidal back EMF. In one aspect, a multi-phase electric machine may include a stator, and a rotor for spinning within the stator, the rotor includes a plurality of poles having magnet assemblies includes at least a low strength magnet and a high strength magnet therein for creating a non-sinusoidal back EMF. In other aspects, a multi-phase electric machine of the present disclosure includes a stator, and a rotor for spinning within the stator, the rotor including a plurality of poles having magnet assemblies includes at least a first magnet and second magnet therein for creating a non-sinusoidal back EMF wherein a strength ratio of the first magnet and second magnet greater than the absolute value of 1.

A rotor of a rotary electric machine includes a rotor core having a magnet insertion hole and a permanent magnet. A magnet insertion hole has an inner diameter side wall surface and an outer diameter side wall surface. A permanent magnet has an inner diameter surface and an outer diameter surface. The rotor further includes a foam adhesive sheet provided at least either between the inner diameter surface and the inner diameter side wall surface or between the outer diameter surface and the outer diameter side wall surface. The foam adhesive sheet includes a foam layer and an adhesive layer stacked in a radial direction. The foam layer is closely fixed to the permanent magnet. The adhesive layer faces the magnet insertion hole. The foam layer is foamed, the adhesive layer closely contacts with the magnet insertion hole, and the permanent magnet is fixed to the magnet insertion hole.

A rotor of a rotary electric machine includes a rotor core having a magnet insertion hole and a permanent magnet. A magnet insertion hole has an inner diameter side wall surface and an outer diameter side wall surface. A permanent magnet has an inner diameter surface and an outer diameter surface. The rotor further includes a foam adhesive sheet provided at least either between the inner diameter surface and the inner diameter side wall surface or between the outer diameter surface and the outer diameter side wall surface. The foam adhesive sheet includes a foam layer and an adhesive layer stacked in a radial direction. The foam layer is closely fixed to the permanent magnet. The adhesive layer faces the magnet insertion hole. The foam layer is foamed, the adhesive layer closely contacts with the magnet insertion hole, and the permanent magnet is fixed to the magnet insertion hole.

Aircraft electric motors are described. The electric motors include a substantially annular shaped motor housing having an outer wall and an inner wall, wherein a rotor-stator cavity is defined between the outer wall and the inner wall and a gear assembly cavity is defined radially inward from the inner wall and a gear assembly arranged within the gear assembly cavity. The gear assembly includes a sun gear operably connected to a first shaft, at least one planetary gear arranged radially outward from the sun gear and rotationally engaged with the sun gear, and a ring gear arranged radially outward from the at least one planetary gear and rotationally engaged with the at least one planetary gear, wherein the ring gear is operably connected to a second shaft.

A high-frequency rotating structure provided by the invention has an annular rotating element with a quincuncial outer periphery, a plurality of radially arranged accommodating grooves respectively disposed in an annular body of the rotating element, a plurality of hole-shaped magnetic barrier spaces respectively disposed in the annular body, and respectively communicated with one of two ends of each of the accommodating grooves, and a plurality of magnetic assemblies respectively embedded in each of the accommodating grooves. A shortest first distance A between a groove wall of each of the two ends of each of the accommodating grooves and an outer annular surface of the body, and a shortest second distance B between a hole wall of each of the magnetic barrier spaces and the outer annular surface of the body are defined by the following formula 1: $\begin{array}{cc}\alpha =\frac{A}{B}\times 100\%,122\%\ge \alpha \ge 90\%.& \mathrm{formula}1\end{array}$

A high-frequency rotating structure provided by the invention has an annular rotating element with a quincuncial outer periphery, a plurality of radially arranged accommodating grooves respectively disposed in an annular body of the rotating element, a plurality of hole-shaped magnetic barrier spaces respectively disposed in the annular body, and respectively communicated with one of two ends of each of the accommodating grooves, and a plurality of magnetic assemblies respectively embedded in each of the accommodating grooves. A shortest first distance A between a groove wall of each of the two ends of each of the accommodating grooves and an outer annular surface of the body, and a shortest second distance B between a hole wall of each of the magnetic barrier spaces and the outer annular surface of the body are defined by the following formula 1: $\begin{array}{cc}\alpha =\frac{A}{B}\times 100\%,122\%\ge \alpha \ge 90\%.& \mathrm{formula}1\end{array}$