Field winding type synchronous machine

Patent metadata

Field	Value
Publication number	US-2016336891-A1
Application number	US-201615154268-A
Country	US
Kind code	A1
Filing date	May 13, 2016
Priority date	May 13, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

A field winding type synchronous machine has a stator having a stator core to which a stator coil is wound, and a rotor that rotates while facing a peripheral surface of the stator with an electromagnetic gap therebetween. The rotor includes a rotor core having a plurality of main pole portions and interpole portions, main pole windings wound around the main pole portions, interpole windings wound around the interpole portions, and a full-wave rectifier circuit for energizing the field current to the main pole windings. The interpole windings produce the induced current by a magnetic flux generated by a time harmonic current superimposed on a fundamental wave of the stator coil. The electromagnetic gaps between the interpole portions and a circumferential surface of the stator are configured larger than electromagnetic between the main pole portions and the circumferential surface of the stator.

First claim

What is claimed is:

1 . A field winding type synchronous machine comprising:
a stator having a stator core having a stator coil formed of a plurality of distributed phase windings that forms a rotating magnetic field; and a rotor that rotates while facing a peripheral surface of the stator with an electromagnetic gap therebetween; wherein, the rotor includes a rotor core having a plurality of main pole portions projecting toward the stator that are spaced apart by a predetermined electrical angle pitch from each other, the make a field magnetic flux flow to the stator core, and main pole portions making a plurality of interpole portions projecting toward the stator that are spaced apart at roughly 90 degrees in electrical angle with respect to the main pole portions; main pole windings wound around the main pole portions to form the field magnetic flux; interpole windings wound around the interpole portions to produce an induced current; and a rectifier circuit that rectifies the induced current to a field current and energizes the field current to the main pole winding; wherein, the interpole windings produce the induced current by a magnetic flux generated by a time harmonic current superimposed on a fundamental wave of the stator coil; and electromagnetic gaps between the interpole portions and a circumferential surface of the stator are configured larger than electromagnetic gaps between the main pole portions and the circumferential surface of the stator.

2 . The field winding type synchronous machine according to claim 1 , wherein,
permanent magnets are disposed between the interpole portions and the stator.

3 . The field winding type synchronous machine according to claim 2 , wherein,
the permanent magnets are disposed at positions shifted substantially 90 electrical degrees in a retarded direction from the main pole portions, and are disposed in a state of the same polarity as polarities of the main pole portions.

4 . The field winding type synchronous machine according to claim 1 , wherein,
a switch is disposed between the rectifier circuit and the main pole windings.

5 . The field winding type synchronous machine according to claim 2 , wherein,
a switch is disposed between the rectifier circuit and the main pole windings.

6 . The field winding type synchronous machine according to claim 3 , wherein,
a switch is disposed between the rectifier circuit and the main pole windings.

7 . The field winding type synchronous machine according to claim 1 , wherein,
there are provided interpole auxiliary windings wound around the interpole portions, and the interpole auxiliary windings are connected in series with the main pole windings.

8 . The field winding type synchronous machine according to claim 2 , wherein,
there are provided interpole auxiliary windings wound around the interpole portions, and the interpole auxiliary windings are connected in series with the main pole windings.

9 . The field winding type synchronous machine according to claim 3 , wherein,
there are provided interpole auxiliary windings wound around the interpole portions, and the interpole auxiliary windings are connected in series with the main pole windings.

10 . The field winding type synchronous machine according to claim 4 , wherein,
there are provided interpole auxiliary windings wound around the interpole portions, and the interpole auxiliary windings are connected in series with the main pole windings.

11 . The field winding type synchronous machine according to claim 5 , wherein,
there are provided interpole auxiliary windings wound around the interpole portions, and the interpole auxiliary windings are connected in series with the main pole windings.

12 . The field winding type synchronous machine according to claim 6 , wherein,
there are provided interpole auxiliary windings wound around the interpole portions, and the interpole auxiliary windings are connected in series with the main pole windings.

13 . The field winding type synchronous machine according to claim 7 , wherein,
the interpole auxiliary windings are disposed at positions shifted substantially 90 electrical degrees in a retarded direction from the main pole portions, and are disposed in a state of the same polarity as polarities of the main pole portions.

14 . The field winding type synchronous machine according to claim 8 , wherein,
the interpole auxiliary windings are disposed at positions shifted substantially 90 electrical degrees in a retarded direction from the main pole portions, and are disposed in a state of the same polarity as polarities of the main pole portions.

15 . The field winding type synchronous machine according to claim 9 , wherein,
the interpole auxiliary windings are disposed at positions shifted substantially 90 electrical degrees in a retarded direction from the main pole portions, and are disposed in a state of the same polarity as polarities of the main pole portions.

16 . The field winding type synchronous machine according to claim 10 , wherein,
the interpole auxiliary windings are disposed at positions shifted substantially 90 electrical degrees in a retarded direction from the main pole portions, and are disposed in a state of the same polarity as polarities of the main pole portions.

17 . The field winding type synchronous machine according to claim 11 , wherein,
the interpole auxiliary windings are disposed at positions shifted substantially 90 electrical degrees in a retarded direction from the main pole portions, and are disposed in a state of the same polarity as polarities of the main pole portions.

18 . The field winding type synchronous machine according to claim 12 , wherein,
the interpole auxiliary windings are disposed at positions shifted substantially 90 electrical degrees in a retarded direction from the main pole portions, and are disposed in a state of the same polarity as polarities of the main pole portions.

Assignees

• Denso Corp

Inventors

• Seguchi Masahiro

Classifications

• H02K2201/03

  Machines characterised by aspects of the air-gap between rotor and stator · CPC title

• H02K19/12

  characterised by the arrangement of exciting windings, e.g. for self-excitation, compounding or pole-changing · CPC title

• H02K19/28

  for self-excitation · CPC title

• H02P25/03 Primary

  with brushless excitation · CPC title

• H02P2207/05

  Synchronous machines, e.g. with permanent magnets or DC excitation · CPC title