Rotary electric machine and non-contact power generator

Patent metadata

Field	Value
Publication number	US-11101725-B2
Application number	US-201715834784-A
Country	US
Kind code	B2
Filing date	Dec 7, 2017
Priority date	Jun 10, 2015
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

Provided is a rotary electric machine including: a permanent magnet rotatable around a first rotational shaft and disposed at a distance from a main surface of a moving body rotating or moving, at least a part of a side surface of the permanent magnet continuous to an outer peripheral surface thereof being opposed to the main surface of the moving body, wherein the permanent magnet is rotated around the first rotational shaft by a reaction force acting on the permanent magnet, the reaction force being caused by eddy currents produced in the main surface of the moving body in such a direction as to hinder a change of magnetic flux from the permanent magnet, and a surface speed of the side surface of the permanent magnet opposed to the moving body is lower than a surface speed of the main surface of the moving body opposed thereto.

First claim

What is claimed is:

1. A rotary electric machine, comprising:
a permanent magnet rotatable around a first rotational shaft and disposed at a distance from a main surface of a moving body rotating or moving, the main surface of the moving body being formed of an electrically conductive material, the permanent magnet having a side surface and an outer peripheral surface, a side surface of the permanent magnet opposed to the main surface of the moving body having a first portion faced with a side surface of the moving body and a second portion not faced with the side surface of the moving body,
one or more coils arranged at such positions as to be linked with magnetic flux from the permanent magnet, the one or more coils producing an induced current according to an amount of change of the magnetic flux linked with the one or more coils; and
a magnetic flux guide member provided in a magnetic path of the magnetic flux running from the permanent magnet, linked with the one or more coils, and returning to the permanent magnet, the magnetic flux guide member being disposed to face the second portion of the permanent magnet,
wherein the permanent magnet is rotated around the first rotational shaft by a reaction force acting on the permanent magnet, the reaction force being caused by eddy currents produced in the main surface of the moving body in such a direction as to hinder a change of magnetic flux from the permanent magnet, and
wherein a surface speed of the side surface of the permanent magnet opposed to the moving body is lower than a surface speed of the main surface of the moving body opposed thereto.

2. The rotary electric machine of claim 1 , wherein when the moving body moves in one direction, the permanent magnet rotates around the first rotational shaft in a rotational direction corresponding to the one direction, the first rotational shaft extending in a direction intersecting the one direction.

3. The rotary electric machine of claim 1 , wherein when the moving body rotates around a second rotational shaft, the permanent magnet rotates around the first rotational shaft parallel to the second rotational shaft in a rotational direction corresponding to a rotational direction of the moving body.

4. The rotary electric machine of claim 3 , wherein at least the part of the side surface of the permanent magnet continuous to the outer peripheral surface of the permanent magnet is opposed at a distance to at least a part of a side surface of the moving body continuous to an outer peripheral surface of the moving body, and
wherein the permanent magnet is rotated in a direction corresponding to the rotational direction of the moving body by a reaction force acting on the permanent magnet, the reaction force being caused by eddy currents produced in the side surface of the moving body continuous to the outer peripheral surface thereof in such a direction as to hinder a change of magnetic flux from the permanent magnet.

5. The rotary electric machine of claim 3 , wherein half or less of a total area of the side surface of the permanent magnet on a moving body side is opposed to the moving body.

6. The rotary electric machine of claim 1 , wherein, when the moving body rotates around a second rotational shaft, the first rotational shaft is positioned in an extension of the second rotational shaft,
wherein an entirety of the side surface of the permanent magnet on a moving body side is opposed to the moving body, and
wherein the permanent magnet rotates in a same direction as the moving body.

7. The rotary electric machine of claim 1 , wherein the permanent magnet includes two or more magnetic poles opposed to the moving body, each of the two or more magnetic poles being magnetized in a direction toward the moving body opposed thereto or an opposite direction.

8. The rotary electric machine of claim 1 , wherein the permanent magnet includes two or more magnetic poles opposed to the moving body, and
wherein the one or more coils are provided for each of one or more of the two or more magnetic poles.

9. The rotary electric machine of claim 1 , wherein the one or more coils are provided to face another side surface of the permanent magnet opposite to the side surface thereof opposed to the moving body.

10. The rotary electric machine of claim 1 , wherein the one or more coils are provided between the side surface of the permanent magnet opposed to the moving body and the main surface of the moving body.

11. The rotary electric machine of claim 10 , wherein the permanent magnet has Halbach array structure.

12. The rotary electric machine of claim 1 , wherein the one or more coils are provided to face another side surface of the permanent magnet opposite to the side surface thereof opposed to the moving body, and
wherein the magnetic flux guide member is disposed to face a surface of the one or more coils opposite to a surface thereof opposed to the permanent magnet.

13. The rotary electric machine of claim 1 , wherein the one or more coils are provided to face another side surface of the permanent magnet opposite to the side surface thereof opposed to the moving body, and
wherein the magnetic flux guide member comprises:
a first magnetic flux guide member disposed to face a surface of the one or more coils opposite to a surface thereof opposed to the permanent magnet; and
a second magnetic flux guide member disposed to face the side surface of the permanent magnet on a moving body side at a portion not opposed to the moving body.

14. The rotary electric machine of claim 13 , wherein the second magnetic flux guide member is disposed in a part of a region in which the permanent magnet and the moving body are opposed to each other.

15. The rotary electric machine of claim 1 , further comprising: one or more core members inserted into the one or more coils to increase a density of magnetic flux passing the one or more coils.

16. The rotary electric machine of claim 1 , further comprising: a magnetic flux guide member having an annular shape and passed by the magnetic flux from the permanent magnet,
wherein the one or more coils are wound around the magnetic flux guide member.

17. The rotary electric machine of claim 1 , further comprising: a drive body to be driven by a rotational force of the first rotational shaft.

18. The rotary electric machine of claim 17 , wherein the drive body is a motor.

19. A non-contact power generator, comprising:
a permanent magnet rotatable around a first rotational shaft and disposed at a distance from a main surface of a moving body rotating or moving, the main surface of the moving body being formed of an electrically conductive material, the permanent magnet having a side surface and an outer peripheral surface, a side surface of the permanent magnet opposed to the main surface of the moving body having a first portion faced with a side surface of the moving body and a second portion not faced with the side surface of the moving body, and
one or more coils arranged at such positions as to be linked with magnetic flux from the permanent magnet, the one or more coils producing an induced current according to an amount of change of the magnetic flux linked with the one or more coils, and
a magnetic flux guide member provided in at least a part of a magnetic path of the magnetic flux running from the permanent magnet, linked with the one or more coils, and returning to the permanent magnet, the magnetic flux guide member being disposed to face the second portion of the permanent magnet,
wherein the permanent

Assignees

• Nabtesco Corp

Inventors

• FLANKL Michael
• Tueysuez Arda
• Kolar Johann W
• Tsukada Yusuke
• Nakamura Kazuhito

Classifications

• H02K1/2795

  the rotor consisting of two or more circumferentially positioned magnets · CPC title

• H02K49/108

  with an axial air gap · CPC title

• H02K49/046 Primary

  with an axial airgap · CPC title

• H02K7/11

  with dynamo-electric clutches · CPC title

• H02K7/1846

  structurally associated with wheels or associated parts (dynamos arranged in the wheel hub of cycles B62J6/12) · CPC title