A variable flux permanent-magnet synchronous motor, a powertrain, and a fan are disclosed, which are applied to the field of motors. The variable flux permanent-magnet synchronous motor includes a stator system 10, a rotor system 20, and a variable magnet system 30. The variable magnet system 30 is located in the stator system 10 or the rotor system 20. The rotor system 20 includes a first permanent magnet 201. The variable magnet system 30 includes a second permanent magnet 301 and a heating apparatus 302. Coercive force of the second permanent magnet 301 is lower than coercive force of the first permanent magnet 201. The heating apparatus 302 is configured to heat the second permanent magnet 301, so that the second permanent magnet 301 has variable flux in a magnetic field.

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 magnetic array for use in a synchronous electrical machine or a magnetic gear box, comprising a plurality of discrete magnetic segments. When individual ones of the segments are spaced away from influence of ferromagnetic material, such as prior to placement in the array, each includes a pole having the same maximum field strength. Each segment is positioned in a sequence along a circumferential array with changes in field orientation by which the field of each segment is spatially rotated relative to the field of a next segment in the sequence. Each segment is positioned in sufficient proximity to the next segment in the sequence to enable the fields to interact with one another and effect flux channeling.

A magnetic array for use in a synchronous electrical machine or a magnetic gear box, comprising a plurality of discrete magnetic segments. When individual ones of the segments are spaced away from influence of ferromagnetic material, such as prior to placement in the array, each includes a pole having the same maximum field strength. Each segment is positioned in a sequence along a circumferential array with changes in field orientation by which the field of each segment is spatially rotated relative to the field of a next segment in the sequence. Each segment is positioned in sufficient proximity to the next segment in the sequence to enable the fields to interact with one another and effect flux channeling.

An electric machine is presented. The electric machine includes a stator and a rotor disposed concentric to the stator. At least one of the rotor and the stator includes a core including a plurality of laminates stacked along the axial direction of the electric machine, where the stacked plurality of laminates defines a plurality of axial slots. The at least one of the rotor and the stator further includes a permanent magnet assembly disposed in one or more of the plurality of axial slots, where the permanent magnet assembly includes two or more permanent magnets disposed serially along the axial direction of the electric machine such that adjacently disposed permanent magnets overlap one another to form an overlapped interface. The overlapped interface spans at least two laminates of the plurality of laminates of the core.

An outer rotor of a permanent magnet assisted synchronous reluctance motor includes an annular rotor core and a plurality of magnetic steels; the annular rotor core includes a central hole; the annular rotor core further includes a plurality of slots, and the plurality of magnetic steels are disposed in the plurality of slots and form a plurality of magnetic poles along the circumferential direction of the rotor core. Each magnetic pole includes three shapes of magnetic steel: a first arc-shaped magnetic steel concentric with the rotor core, a second arc-shaped magnetic steel not concentric with the rotor core, and a rectangular magnetic steel. In each magnetic pole, the three shapes of magnetic steel are symmetrically arranged along the center line of the magnetic pole, and the first arc-shaped magnetic steel, the second arc-shaped magnetic steel and the rectangular magnetic steel are sequentially spaced radially from inside to outside.

An outer rotor of a permanent magnet assisted synchronous reluctance motor includes an annular rotor core and a plurality of magnetic steels; the annular rotor core includes a central hole; the annular rotor core further includes a plurality of slots, and the plurality of magnetic steels are disposed in the plurality of slots and form a plurality of magnetic poles along the circumferential direction of the rotor core. Each magnetic pole includes three shapes of magnetic steel: a first arc-shaped magnetic steel concentric with the rotor core, a second arc-shaped magnetic steel not concentric with the rotor core, and a rectangular magnetic steel. In each magnetic pole, the three shapes of magnetic steel are symmetrically arranged along the center line of the magnetic pole, and the first arc-shaped magnetic steel, the second arc-shaped magnetic steel and the rectangular magnetic steel are sequentially spaced radially from inside to outside.

A rotating electric machine includes a field system, which includes a magnet section, and an armature. The magnet section includes a plurality of magnets that are arranged at predetermined intervals and in alignment with each other in a circumferential direction. The magnets have easy axes of magnetization oriented such that at locations closer to a d-axis, the directions of the easy axes of magnetization are more parallel to the d-axis than at locations closer to a q-axis. In the magnets, magnet magnetic paths are formed along the easy axes of magnetization. The field system further includes a field-system core that is formed of a soft-magnetic material. The field-system core has protrusions protruding to the armature side. Each of the protrusions is located closer to the q-axis than to the d-axis in the circumferential direction. Circumferential end surfaces of the protrusions respectively abut circumferential end surfaces of the magnets.

A rotating electric machine includes a field system, which includes a magnet section, and an armature. The magnet section includes a plurality of magnets that are arranged at predetermined intervals and in alignment with each other in a circumferential direction. The magnets have easy axes of magnetization oriented such that at locations closer to a d-axis, the directions of the easy axes of magnetization are more parallel to the d-axis than at locations closer to a q-axis. In the magnets, magnet magnetic paths are formed along the easy axes of magnetization. The field system further includes a field-system core that is formed of a soft-magnetic material. The field-system core has protrusions protruding to the armature side. Each of the protrusions is located closer to the q-axis than to the d-axis in the circumferential direction. Circumferential end surfaces of the protrusions respectively abut circumferential end surfaces of the magnets.