A motor includes a rotor having a shaft and a rotor magnet, and a stator. The rotor magnet includes a first magnet magnetized so as to have polar-anisotropic orientation, and second magnets, the number of which is P (P is an even number), provided on an outer circumference of the first magnet, magnetized so as to have polar-anisotropic orientation, and having a stronger magnetic pole than the first magnet. A length Hr of the rotor magnet in the axial direction and a length Hs of a stator core in the axial direction satisfy Hr>Hs. The rotor magnet includes, in the axial direction, a stator-facing portion facing the stator core in the radial direction and an overhang portion protruding from the stator core in the axial direction. A volume ratio of the second magnets to the first magnet is smaller in the overhang portion than in the stator-facing portion.

A motor for a compressor, according to one embodiment of the present disclosure, may comprise one or more magnets. The motor may comprise a rotor core having a plurality of magnet support structures, which define one or more magnet-mounting spaces, disposed on the inner circumferential surface of the rotor core. The motor may comprise a rotor housing that is injection molded to be integrally coupled to the magnets and the rotor core. The magnet-mounting spaces may have one of the magnets inserted and arranged along a first direction. The magnet support structures may have, on the inner side thereof, a pass hole through which resin flows based on the injection molding of the rotor housing.

A motor for a compressor, according to one embodiment of the present disclosure, may comprise one or more magnets. The motor may comprise a rotor core having a plurality of magnet support structures, which define one or more magnet-mounting spaces, disposed on the inner circumferential surface of the rotor core. The motor may comprise a rotor housing that is injection molded to be integrally coupled to the magnets and the rotor core. The magnet-mounting spaces may have one of the magnets inserted and arranged along a first direction. The magnet support structures may have, on the inner side thereof, a pass hole through which resin flows based on the injection molding of the rotor housing.

A motor rotor including magnetic steels with a plurality of coatings, a motor, a powertrain, and a vehicle. The motor rotor includes a rotor iron core, a plurality of magnetic steels, a plurality of fastening coatings, and a plurality of protective coatings, the rotor iron core includes a plurality of magnetic steel grooves, and each magnetic steel groove is configured to accommodate one or more magnetic steels. The one magnetic steel includes two first surfaces parallel to the axial direction of the rotor iron core, a gap between the one first surface and the inner wall of the magnetic steel groove is used to accommodate one fastening coating. In the embodiments, the magnetic steel is fastened by using the fastening coating, so that a risk of damage to the protective coating is reduced.

In accordance with at least one aspect of this disclosure, a composite rotor includes a first rotor portion defining a first rotational axis and having a first magnet therein and a second rotor portion defining a second rotational axis and having a second magnet therein. A stator portion is disposed radially between the first rotor portion and the second rotor portion. The first rotor portion and the second rotor portion are formed of composite filaments and/or composite tape, and the composite filaments and/or composite tape are wrapped in both a first direction and a second direction different from the first direction relative to the first and second rotation axes.

A subassembly for an electric machine comprising: a hub comprising: a first set of teeth, the first set of teeth defining post-receiving gaps between adjacent teeth of the first set and; a second set of teeth defining post-receiving gaps between adjacent teeth of the second set, the second set being spaced from the first set and defining magnet-receiving gaps therebetween; a plurality of permanent magnets arranged within the magnet-receiving gaps; and a plurality of ferrous posts arranged within the post-receiving gaps and between the permanent magnets.

A subassembly for an electric machine comprising: a hub comprising: a first set of teeth, the first set of teeth defining post-receiving gaps between adjacent teeth of the first set and; a second set of teeth defining post-receiving gaps between adjacent teeth of the second set, the second set being spaced from the first set and defining magnet-receiving gaps therebetween; a plurality of permanent magnets arranged within the magnet-receiving gaps; and a plurality of ferrous posts arranged within the post-receiving gaps and between the permanent magnets.

A rotor including, a core including a shaft center and a magnet hole, and a magnet material portion formed by injecting an injection molding material containing a magnetic powder into the magnet hole, in which the magnet material portion includes a magnet body inside the magnet hole, and a material end outside the magnet hole, and the material end encloses the magnet hole and is separated into a plurality of portions in a circumferential direction as viewed in an axial direction.

A rotor including, a core including a shaft center and a magnet hole, and a magnet material portion formed by injecting an injection molding material containing a magnetic powder into the magnet hole, in which the magnet material portion includes a magnet body inside the magnet hole, and a material end outside the magnet hole, and the material end encloses the magnet hole and is separated into a plurality of portions in a circumferential direction as viewed in an axial direction.

A rotating electrical machine rotor manufacturing method including a step of providing a first core and a second core, each having an axis and a magnet arrangement hole, a first setting step of setting the first core on a molding device, a first filling step of, after the first setting step, filling the magnet arrangement hole of the first core with an injection molding material including magnetic powder, a second setting step of, after the first filling step, setting the second core together with the first core on the molding device in a state where the second core is adjacent to the first core in an axial direction, and a second filling step of, after the second setting step, filling the magnet arrangement hole of the second core with the injection molding material.