Magnetic wave gear device

Patent metadata

Field	Value
Publication number	US-10014738-B2
Application number	US-201314768681-A
Country	US
Kind code	B2
Filing date	May 21, 2013
Priority date	Feb 22, 2013
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A magnetic wave gear device ( 1 A, 1 B, 1 F) includes: a first member ( 10 ), a second member ( 20 ), and a third member ( 30 ) which are rotatable relative to one another around a rotation axis (R). The second member ( 20 ) is disposed between the first member ( 10 ) and the third member ( 30 ), and includes magnetic material pieces ( 21 ). The first member ( 10 ) includes first permanent magnets ( 12 A, 12 B). The third member ( 30 ) includes: a plurality of pole teeth ( 32 ), a pole tooth ( 32 ) being wound with a coil ( 33 ); and second permanent magnets ( 34 B), each second permanent magnet ( 34 B) being disposed between pole teeth ( 32 ) next to each other, and the magnetic poles of sides of the second permnanent magnets ( 34 B) facing the second member ( 20 ) being the same pole.

First claim

The invention claimed is:

1. A magnetic wave gear device comprising:
a first member, a second member, and a third member which are rotatable relative to one another around a rotation axis,
wherein the second member is disposed between the first and third members, and includes a plurality of magnetic material pieces disposed around the rotation axis,
wherein the first member includes a plurality of first permanent magnets facing the second member and disposed around the rotation axis, and
wherein the third member includes:
(i) a plurality of pole teeth facing the second member and disposed around the rotation axis, a coil being singly wound on each pole tooth, and portions of coils next to each other in a direction around the rotation axis being disposed between pole teeth next to each other in the direction, and
(ii) a plurality of second permanent magnets, each second permanent magnet being disposed between the pole teeth in the direction and being disposed between the second member and the portions of the coils in a radial direction, and magnetic poles of sides of the second permanent magnets facing the second member being the same pole.

2. The magnetic wave gear device according to claim 1 ,
wherein the plurality of first permanent magnets are disposed such that magnetic poles of first permanent magnets next to each other are opposite to each other in the radial direction.

3. The magnetic wave gear device according to claim 1 ,
wherein the plurality of first permanent magnets are disposed such that magnetic poles of sides of the first permanent magnets facing the second member are the same pole.

4. The magnetic wave gear device according to claim 3 ,
wherein a second magnetic material piece is disposed between first permanent magnets next to each other.

5. The magnetic wave gear device according to claim 1 ,
wherein the third member further includes a pole tooth intermediate portion disposed between coils wound on pole teeth next to each other, and
the second permanent magnet is disposed between the pole tooth intermediate portion and the second member in the radial direction.

6. The magnetic wave gear device according to claim 1 ,
wherein the second permanent magnet is provided so as to contact the pole tooth.

7. The magnetic wave gear device according to claim 1 ,
wherein a gap is formed between the second permanent magnet and the pole tooth.

Assignees

• Ihi Corp
• Univ Osaka

Inventors

• Tojima Narifumi
• ISHIMOTO Koshi
• Hirata Katsuhiro
• Niguchi Noboru
• ZAINI Ariff
• OSHIUMI Tsubasa
• Morimoto Eiki

Classifications

• H02K49/06 Primary

  of the synchronous type {(H02K49/10 takes precedence)} · CPC title

• H02K1/17

  Stator cores with permanent magnets · CPC title

• H02K1/2706

  Inner rotors · CPC title

• H02K1/2793 Primary

  Rotors axially facing stators · CPC title

• H02K1/16

  Stator cores with slots for windings · CPC title