Magnetless rotating electric machine

Patent metadata

Field	Value
Publication number	US-10050503-B2
Application number	US-201615082758-A
Country	US
Kind code	B2
Filing date	Mar 28, 2016
Priority date	Mar 31, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A magnetless rotating electric machine has an outer stator, an inner stator, and an annular rotor interposed between the outer stator and the inner stator. A plurality of outer-inner salient pole pairs are provided in the annular rotor along a circumferential direction of an annular rotor yoke. A rotor yoke coil is wound around one side of the rotor yoke and around another side of the rotor yoke along the circumferential direction with the respective outer-inner salient pole pairs sandwiched therebetween. Rectifying elements make a magnetic pole polarity of the outer salient poles and magnetic pole polarity of the inner salient poles, which are magnetized by an induced current of the rotor yoke coil caused by magnetization of the outer stator and the inner stator, identical with each other, and also make magnetic pole polarities of the adjacent outer-inner salient pole pairs opposite each other.

First claim

The invention claimed is:

1. A magnetless rotating electric machine comprising:
an annular outer stator having an outer exciting coil;
an annular inner stator that is placed integrally inside the outer stator and has an inner exciting coil;
an annular rotor that is interposed between an inner circumferential side of the outer stator and an outer circumferential side of the inner stator and that includes
an annular rotor yoke,
a plurality of outer-inner salient pole pairs provided in pairs along a circumferential direction on the outer circumferential side and the inner circumferential side of the rotor yoke, and
a rotor yoke coil wound around the rotor yoke on one side and the rotor yoke on another side in the circumferential direction with each of the outer-inner salient pole pairs sandwiched therebetween; and

rectifying elements that are connected between the two ends of the rotor yoke coil to make a polarity of outer magnetic poles of the outer salient poles and a polarity of inner magnetic poles of the inner salient poles, which are magnetized by an induced current induced by magnetic excitation of the outer stator and the inner stator, identical with each other;
wherein the rotor yoke coil is wound around the rotor yoke on the one side a predetermined number of turns in the circumferential direction and is wound around the rotor yoke on the other side a predetermined number of turns while a winding direction is changed to an opposite direction when the rotor yoke coil circumferentially crosses the outer-inner salient pole pair from the one side to the other side, and
wherein, in connection with the circumferentially-adjacent outer-inner magnetic pole pairs, the rectifying elements make the polarity of the magnetic pole of the outer-inner salient pole pair on the one side opposite the polarity of the magnetic pole of the outer-inner salient pole pair on the other side.

2. The magnetless rotating electric machine according to claim 1 , wherein the rotor yoke coil is wound in a predetermined number of layers as a multilayer winding along a radial direction of the rotor yoke.

3. The magnetless rotating electric machine according claim 2 , wherein an induction coil comprising:
an induction coil wound around the outer salient pole a predetermined number of turns from a leading-end side of the outer salient pole toward an outermost radial position of the multilayer winding of the rotor yoke coil and around the inner salient pole a predetermined number of turns from an outermost radial position of the multilayer winding of the rotor yoke coil toward a leading-end side of the inner salient pole while a winding direction of the induction coil is changed to an opposite direction when the induction coil circumferentially crosses over the outer-inner salient pole pair; and
an induction-coil rectifying element that is connected between an end of the induction coil on a part of the outer salient pole and an end of the induction coil on a part of the inner salient pole to make a polarity of an outer magnetic pole of the outer salient pole and a polarity of an inner magnetic pole of the inner salient pole, which are magnetized by the induced current induced by the induction coil, identical with the polarity of the magnetic pole magnetized by the rotor yoke coil.

4. The magnetless rotating electric machine according to claim 3 , wherein a common rectifying element is used for the induction-coil rectifying element and the rectifying element used with the rotor yoke coil.

5. The magnetless rotating electric machine according to claim 1 , wherein one common rectifying element is used for the outer-inner salient pole pairs having the same magnetic pole polarity among the plurality of outer-inner salient pole pairs.

6. The magnetless rotating electric machine according to claim 2 , wherein one common rectifying element is used for the outer-inner salient pole pairs having the same magnetic pole polarity among the plurality of outer-inner salient pole pairs.

7. The magnetless rotating electric machine according to claim 4 , wherein one common rectifying element is used for the outer-inner salient pole pairs having the same magnetic pole polarity among the plurality of outer-inner salient pole pairs.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamada Eiji

Classifications

• H02K16/04 Primary

  Machines with one rotor and two stators · CPC title

• H02K19/28

  for self-excitation · CPC title

• H02K19/12

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