Rotating electric machine

Patent metadata

Field	Value
Publication number	US-12531450-B2
Application number	US-202118266812-A
Country	US
Kind code	B2
Filing date	Jan 18, 2021
Priority date	Jan 18, 2021
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A rotating electric machine according to the present disclosure is a rotating electric machine including a stator and a rotor, in which the rotor includes a plurality of permanent magnets arranged in a circumferential direction of a rotation axis and a plurality of protrusions arranged in the circumferential direction, the stator includes a plurality of teeth, an armature winding wound around the plurality of teeth, and a field winding wound around the plurality of teeth, a field pole is formed in the plurality of protrusions by energization to the field winding and the plurality of permanent magnets, the plurality of permanent magnets and the plurality of teeth are alternately arranged at intervals in the circumferential direction to form the field pole, all the permanent magnets have the same polarity, wherein, |P a −P f |≠1, |P r −P f |≠1, and |P a −P r |≠1, and P r is even.

First claim

The invention claimed is:

1 . A rotating electric machine comprising:
a stator; and a rotor, wherein the rotor includes a plurality of permanent magnets arranged in a circumferential direction of a rotation axis and a plurality of protrusions arranged in the circumferential direction, the stator includes a plurality of teeth, an armature winding wound around the plurality of teeth, and a field winding F wound around the plurality of teeth, a field pole is formed in the plurality of protrusions by energization to the field winding and the plurality of permanent magnets, the plurality of permanent magnets and the plurality of teeth are alternately arranged at intervals in the circumferential direction to form the field pole, all the permanent magnets have the same polarity, P a the number of pole pairs of the armature winding, P f the number of pole pairs of the field winding, and P r the number of poles of the field pole formed by the plurality of permanent magnets and the plurality of protrusions, satisfy all of |P a −P f |≠1, |P r −P f |≠1, |P a −P r |≠1, and P f +P a =P r , P r is an even number, and in the field pole formed in the plurality of protrusions by energization to the armature winding and the field winding and the plurality of permanent magnets, the number of pole pairs P a and the number of pole pairs P f satisfy P f ÷P a =3 or P f ÷P a =1.5.

2 . The rotating electric machine according to claim 1 , wherein the plurality of permanent magnets is embedded in a core of the rotor.

3 . The rotating electric machine according to claim 1 , wherein a protrusion air-gap length for the plurality of protrusions is different from a permanent magnet portion air-gap length for the plurality of permanent magnets.

4 . The rotating electric machine according to claim 1 , wherein a permanent magnet portion angle for the plurality of permanent magnets is different from a protrusion angle for the plurality of protrusions.

5 . The rotating electric machine according to claim 1 , wherein in the field pole formed in the plurality of protrusions by energization to the armature winding and the field winding and the plurality of permanent magnets, the number of pole pairs Pa and the number of pole pairs Pf satisfy Pf÷Pa=3.

6 . The rotating electric machine according to claim 1 , wherein
the rotor includes a protrusion rotor unit and a permanent magnet rotor unit, and the protrusion rotor unit and the permanent magnet rotor unit are assembled side by side in an axial direction.

7 . The rotating electric machine according to claim 1 , wherein the plurality of permanent magnets forms a corner on a fillet.

8 . The rotating electric machine according to claim 1 , wherein the plurality of protrusions have an arc shape.

9 . The rotating electric machine according to claim 1 , wherein a curvature of a curve where the plurality of protrusions and an air gap are in contact with each other is different from an outermost peripheral outer diameter of the rotor.

10 . The rotating electric machine according to claim 1 , wherein a tip portion of each of the plurality of protrusions is formed of an are having a different curvature than on a fillet thereof.

Assignees

• Mitsubishi Electric Corp

Inventors

• Mitsuda Hiroshi
• Ito Kazumasa
• Fukami Tadashi
• Koyama Masato

Classifications

• H02K1/16

  Stator cores with slots for windings · CPC title

• H02K21/227

  having an annular armature coil · CPC title

• H02K29/03

  with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K1/2791

  Surface mounted magnets; Inset magnets · CPC title