Rotating electric machine

Patent metadata

Field	Value
Publication number	US-10797543-B2
Application number	US-201716333878-A
Country	US
Kind code	B2
Filing date	Sep 11, 2017
Priority date	Sep 15, 2016
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A rotating electric machine includes a stator and a rotor. The stator includes a stator core and an armature coil wound on the stator core. The rotor is arranged radially inside the stator to radially face the stator. The rotor includes: a field core having a plurality of magnetic pole portions for respectively forming a plurality of magnetic poles the polarities of which are alternately different in a circumferential direction; a field coil wound on the field core; and a tubular short-circuiting member that is arranged radially outside the magnetic pole portions to cover radially outer surfaces of the magnetic pole portions and magnetically connects each circumferentially-adjacent pair of the magnetic pole portions. The short-circuiting member is provided within an axial range between two axial ends of the stator core.

First claim

The invention claimed is:

1. A rotating electric machine comprising:
a stator including a stator core and an armature coil wound on the stator core; and
a rotor arranged radially inside the stator to radially face the stator, the rotor including a field core, a field coil and a tubular short-circuiting member, the field core having a plurality of magnetic pole portions for respectively forming a plurality of magnetic poles the polarities of which are alternately different in a circumferential direction, the field coil being wound on the field core, the short-circuiting member being arranged radially outside the magnetic pole portions to cover radially outer surfaces of the magnetic pole portions and magnetically connecting each circumferentially-adjacent pair of the magnetic pole portions,
wherein:
the short-circuiting member is provided within an axial range between two axial ends of the stator core;
a radial thickness of the short-circuiting member is smaller than a radial thickness of an annular part of the stator core; and
W/Wst>1/(6·n), where n is a slot multiplier number, W is the radial thickness of the short-circuiting member and Wst is the radial thickness of the annular part of the stator core.

2. The rotating electric machine as set forth in claim 1 , wherein an axial length of the short-circuiting member is smaller than an axial length of the stator core.

3. The rotating electric machine as set forth in claim 1 , wherein the radial thickness of the short-circuiting member is larger than or equal to ½ of a radial distance between the magnetic pole portions and the stator core.

4. The rotating electric machine as set forth in claim 1 , wherein n=2, and W/Wst > 1/12.

5. The rotating electric machine as set forth in claim 1 , wherein the armature coil is a concentratedly-wound coil which has three phases offset from each other by 120° in electrical angle,
P:N=2:3 or P:N=4:3, where P is the number of poles of the rotor and N is the number of slots of the stator, and
W/Wst >⅙, where W is the radial thickness of the short-circuiting member and Wst is the radial thickness of the annular part of the stator core.

6. A rotating electric machine comprising:
a stator including a stator core and an armature coil wound on the stator core; and
a rotor arranged radially inside the stator to radially face the stator, the rotor including a field core, a field coil and a tubular short-circuiting member, the field core having a plurality of magnetic pole portions for respectively forming a plurality of magnetic poles the polarities of which are alternately different in a circumferential direction, the field coil being wound on the field core, the short-circuiting member being arranged radially outside the magnetic pole portions to cover radially outer surfaces of the magnetic pole portions and magnetically connecting each circumferentially-adjacent pair of the magnetic pole portions,
wherein:
the short-circuiting member is provided within an axial range between two axial ends of the stator core;
the armature coil is a concentratedly-wound coil which has three phases offset from each other by 120° in electrical angle;
P:N=2:3 or P: N=4:3, where P is the number of poles of the rotor and N is the number of slots of the stator; and
W/Wst >⅙, where W is a radial thickness of the short-circuiting member and Wst is a radial thickness of an annular part of the stator core.

Assignees

• Denso Corp

Inventors

• Takahashi Yuuki

Classifications

• H02K1/24 Primary

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title

• H02K19/22

  having windings each turn of which co-operates alternately with poles of opposite polarity, e.g. heteropolar generators · CPC title

• H02K19/10

  for multi-phase current · CPC title

• H02K2213/03

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

• H02K1/243 Primary

  of the claw-pole type · CPC title