Abstract: An electric machine includes a stator, a rotor configured to rotate relative to the stator, an air gap between the stator and the rotor, and a conductive winding disposed in the rotor or the stator. The conductive winding includes a first portion having a first conductivity and a second portion having a second conductivity, the second portion disposed radially between the first portion and the air gap, the first conductivity being different than the second conductivity.

Abstract: An electric propulsion motor system includes a cylindrical stator and rotor, a fluid circulation system providing pressurized fluid, and conductors within winding slots. The stator has a yoke and a plurality of teeth extending radially inward from the yoke, with winding slots defined between adjacent teeth. Respective tooth tips extend circumferentially into adjacent winding slots and are radially adjacent to a first conductor within the winding slot, with a first channel through which pressurized fluid flows.

Abstract: An electric motor includes a stator having a stator core constructed from a ferromagnetic material and having an external stator surface. The stator core includes a stator core body and a plurality of stator teeth extending therefrom and the plurality of stator teeth define conductor slots therebetween. The electric motor also includes at least one rotor, each having an external rotor surface, a plurality of magnetic poles, and configured to rotate relative to the stator about a rotational axis. The stator also includes a plurality of stator conductors arranged within the conductor slots and configured to establish a rotating magnetic field exerting a torque on the rotor(s) via interaction with the magnetic poles. The stator additionally includes a plurality of first cooling channels, each defined by a respective stator tooth and configured to receive and pass therethrough a fluid to cool the corresponding stator tooth.

Abstract: An electric motor having opposed permanent magnet arrays employs overlapping offset coils positioned between the arrays to reduce torque ripple and cogging torque.

Abstract: Stator packages and electric machines, and methods for cooling same, are disclosed herein. In an example embodiment, an electric machine includes a rotor, and a stator package having one or more stator coils, stator core portions, and a heat exchanger. The stator core portions and heat exchanger are arranged successively along a central axis, with the heat exchanger being positioned between the stator core portions. Each of the stator coils is arranged to extend along/within the stator core portions and heat exchanger. The heat exchanger includes walls forming passageways configured so that coolant entering the heat exchanger via an inlet both flows circumferentially from the inlet to an outlet, and additionally flows in an undulating manner both radially inwardly and outwardly substantially in between outer and inner wall surfaces of the heat exchanger, such that the coolant cools the one or more stator coils and the stator core portions.

Abstract: An electric machine includes a stator, a rotor configured to rotate relative to the stator, an air gap between the stator and the rotor, and a conductive winding disposed in the rotor or the stator. The conductive winding includes a first portion having a first conductivity and a second portion having a second conductivity, the second portion disposed radially between the first portion and the air gap, the first conductivity being different than the second conductivity.

Abstract: An electric propulsion motor system includes a cylindrical stator and rotor, a fluid circulation system providing pressurized fluid, and conductors within winding slots. The stator has a yoke and a plurality of teeth extending radially inward from the yoke, with winding slots defined between adjacent teeth. Respective tooth tips extend circumferentially into adjacent winding slots and are radially adjacent to a first conductor within the winding slot, with a first channel through which pressurized fluid flows.

Abstract: Stator packages and electric machines, and methods for cooling same, are disclosed herein. In an example embodiment, an electric machine includes a rotor, and a stator package having one or more stator coils, stator core portions, and a heat exchanger. The stator core portions and heat exchanger are arranged successively along a central axis, with the heat exchanger being positioned between the stator core portions. Each of the stator coils is arranged to extend along/within the stator core portions and heat exchanger. The heat exchanger includes walls forming passageways configured so that coolant entering the heat exchanger via an inlet both flows circumferentially from the inlet to an outlet, and additionally flows in an undulating manner both radially inwardly and outwardly substantially in between outer and inner wall surfaces of the heat exchanger, such that the coolant cools the one or more stator coils and the stator core portions.