Hybrid excitation rotating electrical machine

Patent metadata

Field	Value
Publication number	US-9806569-B2
Application number	US-201314372358-A
Country	US
Kind code	B2
Filing date	Jan 31, 2013
Priority date	Feb 29, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A hybrid excitation rotating electrical machine configured with a rotor having a shaft extended on at least one side in an axial direction, and first and second cores that are separated in the axial direction with a gap between the cores. First magnetic poles that are excited by a permanent magnet and second magnetic poles that are not excited by the permanent magnet are alternately arranged in a circumferential direction in each of the first and second cores. The first magnetic poles of the first core have a different polarity from that of the first magnetic poles of the second core, and the first magnetic poles of one of the first and second cores are placed so as to face the second magnetic poles of the other of the first and second cores in the axial direction with the gap between the magnetic poles.

First claim

The invention claimed is:

1. A hybrid excitation rotating electrical machine, comprising:
a rotor having a shaft extended on at least one side in an axial direction, and first and second cores that are separated in the axial direction with a gap between the cores, wherein first magnetic poles that are excited by a permanent magnet and second magnetic poles that are not excited by the permanent magnet are alternately arranged in a circumferential direction in each of the first and second cores, the first magnetic poles of the first core have a different polarity from that of the first magnetic poles of the second core, and the first magnetic poles of one of the first and second cores are placed so as to face the second magnetic poles of the other of the first and second cores in the axial direction with the gap between the magnetic poles;
a stator that is placed radially outward of the rotor, and that generates a rotating magnetic field rotating the rotor;
an exciting coil that is placed in the gap, and that excites the second magnetic poles; and
a third core that is placed radially inward of the first core, the second core, and the exciting coil, and that is made of a material having smaller iron loss than the shaft wherein:
the shaft is formed in a hollow shape,
each of the first core and the second core is placed radially outward of the shaft and is supported by the shaft, and
the third core is placed radially inward of the shaft and is supported by the shaft.

2. The hybrid excitation rotating electrical machine according to claim 1 , further comprising:
eddy current suppressing means for suppressing an eddy current that is generated in the shaft due to fluctuation of magnetic flux in the exciting coil, wherein
the eddy current suppressing means is provided in the shaft.

3. The hybrid excitation rotating electrical machine according to claim 2 , wherein
the eddy current suppressing means is provided in a region near a part of the shaft which is sandwiched in the axial direction between the first core and the second core, regions near those parts of the shaft which are located radially inward of and face axial ends of the first and second cores, and/or a region near a part of the shaft which is located radially inward of and faces the first and second cores and which is located on a line extending through a center between protruding poles in the circumferential direction of the first and second cores.

4. The hybrid excitation rotating electrical machine according to claim 2 , wherein
the eddy current suppressing means is a slit or void that is formed in the shaft, or a member that is made of a material having higher electrical resistance than a body of the shaft.

5. The hybrid excitation rotating electrical machine according to claim 3 , wherein
the eddy current suppressing means is a slit or void that is formed in the shaft, or a member that is made of a material having higher electrical resistance than a body of the shaft.

6. The hybrid excitation rotating electrical machine according to claim 5 , wherein
each of the first core and the second core is formed by stacking a plurality of insulation coated electromagnetic steel plates in the axial direction, and
the third core is formed by compression molding insulation coated soft magnetic material powder.

7. The hybrid excitation rotating electrical machine according to claim 6 , wherein
the third core is divided in the circumferential direction.

8. The hybrid excitation rotating electrical machine according to claim 7 , wherein
the division of the third core in the circumferential direction is performed along lines extending through an axis and circumferential centers of at least two of all the first magnetic poles and the second magnetic poles that are alternately arranged in the circumferential direction.

9. The hybrid excitation rotating electrical machine according to claim 8 , wherein
the third core is divided at regular intervals in the circumferential direction, and
the number of pieces into which the third core is divided in the circumferential direction is the number of the first magnetic poles and the second magnetic poles that are alternately arranged in the circumferential direction, or a divisor of the number of the first magnetic poles and the second magnetic poles.

10. The hybrid excitation rotating electrical machine according to claim 9 , wherein
the third core has a notch hole in an axial end of the third core, and the notch hole has a diameter that decreases from an axial end face toward an axial center of the third core.

11. The hybrid excitation rotating electrical machine according to claim 1 , wherein
each of the first core and the second core is formed by stacking a plurality of insulation coated electromagnetic steel plates in the axial direction, and
the third core is formed by compression molding insulation coated soft magnetic material powder.

12. The hybrid excitation rotating electrical machine according to claim 1 , wherein
the third core is divided in the circumferential direction.

13. The hybrid excitation rotating electrical machine according to claim 12 , wherein
the division of the third core in the circumferential direction is performed along lines extending through an axis and circumferential centers of at least two of all the first magnetic poles and the second magnetic poles that are alternately arranged in the circumferential direction.

14. The hybrid excitation rotating electrical machine according to claim 12 , wherein
the third core is divided at regular intervals in the circumferential direction, and
the number of pieces into which the third core is divided in the circumferential direction is the number of the first magnetic poles and the second magnetic poles that are alternately arranged in the circumferential direction, or a divisor of the number of the first magnetic poles and the second magnetic poles.

15. The hybrid excitation rotating electrical machine according to claim 1 , wherein
the third core has a notch hole in an axial end of the third core, and the notch hole has a diameter that decreases from an axial end face toward an axial center of the third core.

16. The hybrid excitation rotating electrical machine according to claim 15 , wherein
the notch hole is formed in a tapered shape or a stair-like shape.

17. The hybrid excitation rotating electrical machine according to claim 15 , wherein
the notch hole is formed at each of both axial ends;
the notch holes communicate with each other, and
the third core is formed in a hollow shape.

18. The hybrid excitation rotating electrical machine according to claim 1 , wherein
the shaft is formed by fitting together two cup-shaped members into which the shaft is divided in the axial direction.

19. The hybrid excitation rotating electrical machine according to claim 18 , wherein
one of the two cup-shaped members into which the shaft is divided in the axial direction supports the first core, the other cup-shaped member supports the second core, and the cup-shaped members are fitted together radially inward of the gap in which the exciting coil is placed.

Assignees

• Aisin Aw Co

Inventors

• Yokota Junichi
• Kono Katsuichi
• Takeda Ken

Classifications

• H02K19/12

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

• H02K1/223 Primary

  Rotor cores with windings and permanent magnets (for additional excitation in synchronous motors or generators H02K21/042; in synchronous motors having additional short-circuited winding for starting as an asynchronous motor H02K21/46) · CPC title

• H02K16/02

  Machines with one stator and two {or more} rotors · CPC title

• H02K1/30

  using intermediate parts, e.g. spiders · CPC title

• H02K21/04

  Windings on magnets for additional excitation {; Windings and magnets for additional excitation} · CPC title