Provided is a rotating electric machine. This rotating electric machine includes a stator and a rotor, and the rotor includes: a rotor core having formed therein a magnet insertion hole group; and a permanent magnet group. In the rotor core, a first magnetic slit and a second magnetic slit are formed. In the second magnetic slit, a first magnet magnetic flux guide path connecting a first q-axis magnetic path and a second q-axis magnetic path is arranged. When an angle between a straight line passing through a first intersecting point and a radial center point and a straight line passing through a second intersecting point and the radial center point is set as θ.sub.1, the number of pole pairs is set as P, a natural number is set as m.sub.1, and n.sub.1 is set as a natural number smaller than m.sub.1, the following expression: θ.sub.1=2π×n.sub.1÷{P×(2m.sub.1−1)} [rad] is satisfied.

Methods and systems for cooling an electric motor are provided. An electric motor cooling system, in one example, includes a stator at least partially surrounding a rotor and an inner passage extending axially through the rotor and including an inlet and an outlet. The cooling system further includes an outer passage including an inlet in fluidic communication with the outlet of the inner passage and an outlet in fluidic communication with an inlet of the inner passage and a phase change material in the inner passage and the outer passage.

Methods and systems for cooling an electric motor are provided. An electric motor cooling system, in one example, includes a stator at least partially surrounding a rotor and an inner passage extending axially through the rotor and including an inlet and an outlet. The cooling system further includes an outer passage including an inlet in fluidic communication with the outlet of the inner passage and an outlet in fluidic communication with an inlet of the inner passage and a phase change material in the inner passage and the outer passage.

In a stator or a rotary electric machine, an insulating sheet spreads between two coils adjacent to each other in a circumferential direction in each slot. The insulating sheet covers the end in a third direction of the coil wound in a corresponding tooth, between end surfaces in an axial direction and between an inward-directed surface and an inclined surface in a radial direction. In the slot, an insulating sheet wrapping the adjacent coil is present, but the insulating sheet does not cover the end in a fourth direction of the coil wound around the corresponding tooth.

In a stator or a rotary electric machine, an insulating sheet spreads between two coils adjacent to each other in a circumferential direction in each slot. The insulating sheet covers the end in a third direction of the coil wound in a corresponding tooth, between end surfaces in an axial direction and between an inward-directed surface and an inclined surface in a radial direction. In the slot, an insulating sheet wrapping the adjacent coil is present, but the insulating sheet does not cover the end in a fourth direction of the coil wound around the corresponding tooth.

A brushless DC motor includes a stator, a rotor, and motor terminals mounted on the stator. Each motor terminal includes a planar portion extending circumferentially from the end insulator, a wire-receiving member extending from a first end of the planar portion and folded over an outer surface of the planar portion away from the center axis of the stator at an angle of less than 90 degrees, and a tab portion extending from a second end of the planar portion parallel to the center axis of the stator. A circuit board is disposed adjacent the motor including power switches mounted thereon for energizing the stator windings. Slots are formed in the circuit board to align with and securely receive the tab portions of the motor terminals, thus electrically connecting the motor terminals to the power switches.

A brushless DC motor includes a stator, a rotor, and motor terminals mounted on the stator. Each motor terminal includes a planar portion extending circumferentially from the end insulator, a wire-receiving member extending from a first end of the planar portion and folded over an outer surface of the planar portion away from the center axis of the stator at an angle of less than 90 degrees, and a tab portion extending from a second end of the planar portion parallel to the center axis of the stator. A circuit board is disposed adjacent the motor including power switches mounted thereon for energizing the stator windings. Slots are formed in the circuit board to align with and securely receive the tab portions of the motor terminals, thus electrically connecting the motor terminals to the power switches.

An example rotor assembly includes a rotor core having an axial length and configured to rotate about a longitudinal axis. The rotor core includes a first wall and a second wall radially within the first wall and defining a fluid flow path configured to guide a fluid along an inner surface of the first wall.

An example rotor assembly includes a rotor core having an axial length and configured to rotate about a longitudinal axis. The rotor core includes a first wall and a second wall radially within the first wall and defining a fluid flow path configured to guide a fluid along an inner surface of the first wall.

A single phase permanent magnet motor includes a stator and a rotor. The stator includes a stator corer and windings. The stator corer includes a yoke portion and stator teeth. Each stator tooth includes a winding portion and a pole shoe connected to an end of the winding portion. Each pole shoe includes a pole face. The pole face defines a first positioning notch at a middle thereof. Each of the pole faces further defines at least one second positioning notch. Said at least one second positioning notches in one of pole shoe are located at the same side of the first positioning notch of the corresponding one pole shoe. The first and second positioning notches are configured such that an initial position of the rotor received in the space of the stator is offset from a dead point position.