The rotor includes ribs and permanent magnets mounted as spokes in pole pairs. A second wall of each rotor air gap of a plurality of rotor air gaps is parallel to an edge of a permanent magnet of the permanent magnets. A length of the second wall is less than 80% of a length of the edge. A fifth wall of each rotor air gap of the rotor air gaps is formed by a first side of a rib. Each pair of permanent magnets has an associated pair of rotor air gaps of the rotor air gaps. A first rotor air gap of each pair of rotor air gaps of the rotor air gaps is a mirror image of a second rotor air gap of each pair of rotor air gaps. Each pair of rotor air gaps is separated by an associated rib of the plurality of ribs.

A manufacturing apparatus includes a magnetizing yoke in which a magnet section to be magnetized is installed. The magnetizing yoke includes a core having slots formed at predetermined intervals in a circumferential direction, and a coil received in the slots. When installed with respect to the magnetizing yoke, the magnet section is arranged to face, at locations closer to a d-axis, magnetization surfaces of the core and face, at locations closer to a q-axis, the slots of the core. The magnetization surfaces of the core are formed between the slots adjacent to one another in the circumferential direction. The coil is fixed by a nonmagnetic and elastic fixing material in the slots. On a facing surface of the magnet section which faces the magnetizing yoke, there are radially-recessed grooves formed respectively in q-axis-side portions of the magnet section.

To achieve miniaturization in the rotation axis direction. A motor includes a stator housing having an inner peripheral portion and an outer peripheral portion, a stator supported by an outer peripheral portion of the stator housing, a rotor housing covering the stator housing and the stator, and a magnet supported by an outer peripheral portion of the rotor housing. The stator includes a first surface provided at an inner side of the magnet, supported by the stator housing and positioned in a rotation axis direction, and a second surface opposing an outside in the rotation axis direction. A surface of the magnet supported by the rotor housing is provided at an upper surface portion side of the stator core in the rotation axis direction.

To achieve miniaturization in the rotation axis direction. A motor includes a stator housing having an inner peripheral portion and an outer peripheral portion, a stator supported by an outer peripheral portion of the stator housing, a rotor housing covering the stator housing and the stator, and a magnet supported by an outer peripheral portion of the rotor housing. The stator includes a first surface provided at an inner side of the magnet, supported by the stator housing and positioned in a rotation axis direction, and a second surface opposing an outside in the rotation axis direction. A surface of the magnet supported by the rotor housing is provided at an upper surface portion side of the stator core in the rotation axis direction.

A motor includes: a central shaft; a stator extending in an axial direction around the central shaft; a rotor facing an outer side in a radial direction of the stator and configured to rotate around the central shaft; a substrate located on one side in the axial direction with respect to the rotor and on which a rotation position detection circuit detecting a rotation position of the rotor is mounted; and a case located on one side in the axial direction with respect to the substrate and supporting the stator. The stator includes a restricting portion restricting a position in a circumferential direction of the substrate. The case includes a fixing portion fixing the substrate. The substrate includes a restricted portion whose position in the circumferential direction is restricted by the restricting portion, and a fixed portion fixed to the fixing portion.

Embodiments disclosed herein describe methods for improved permanent magnet motor rotor systems for submersible electric motors. The improved rotor system includes a single piece of material shaft with surface mounted permanent magnets. The single piece of material shaft minimizes the number of shaft bearings and locates the bearings outside of the stator windings.

Embodiments disclosed herein describe methods for improved permanent magnet motor rotor systems for submersible electric motors. The improved rotor system includes a single piece of material shaft with surface mounted permanent magnets. The single piece of material shaft minimizes the number of shaft bearings and locates the bearings outside of the stator windings.

A rotating electrical machine equipped with a magnet unit and a magnetic body. The magnet unit is also equipped with magnet covers wrapped about armature-facing peripheral surfaces of the magnets. Each of the magnets has recesses formed in portions of the armature-facing peripheral surface which are located close to q-axes each of which lies at a boundary between magnetic poles. Each of the magnet covers is recessed in the radial direction in accordance with the shape of the magnet recesses. If the armature-facing peripheral surface of the magnets is between a circumferentially adjacent two of the magnet recesses is defined as a main magnetic pole surface, and an angle representing a circumferential range occupied by the main magnetic pole surface is defined as a main magnetic pole angle ?a, the main magnetic pole angle ?a is selected to be 2?/5<?a<2?/3.

A rotating electrical machine equipped with a magnet unit and a magnetic body. The magnet unit is also equipped with magnet covers wrapped about armature-facing peripheral surfaces of the magnets. Each of the magnets has recesses formed in portions of the armature-facing peripheral surface which are located close to q-axes each of which lies at a boundary between magnetic poles. Each of the magnet covers is recessed in the radial direction in accordance with the shape of the magnet recesses. If the armature-facing peripheral surface of the magnets is between a circumferentially adjacent two of the magnet recesses is defined as a main magnetic pole surface, and an angle representing a circumferential range occupied by the main magnetic pole surface is defined as a main magnetic pole angle ?a, the main magnetic pole angle ?a is selected to be 2?/5<?a<2?/3.

Embodiments disclosed herein describe methods for improved permanent magnet motor rotor systems for submersible electric motors. The improved rotor system includes a single piece of material shaft with surface mounted permanent magnets. The single piece of material shaft minimizes the number of shaft bearings and locates the bearings outside of the stator windings.