Magnetic modulation gear and gear motor

Patent metadata

Field	Value
Publication number	US-2024186878-A1
Application number	US-202418440855-A
Country	US
Kind code	A1
Filing date	Feb 13, 2024
Priority date	Aug 17, 2021
Publication date	Jun 6, 2024
Grant date	—

Abstract

A magnetic modulation gear includes: a plurality of outer pole magnets that are arranged in a circumferential direction; a plurality of magnetic pole pieces that are provided radially inward of the plurality of outer pole magnets and arranged in the circumferential direction; a plurality of inner pole magnets that are provided radially inward of the plurality of magnetic pole pieces and arranged in the circumferential direction. The magnetic modulation gear further includes a shaft member that is connected to the plurality of magnetic pole pieces, the shaft member includes a non-conductive portion and a conductive portion, and the conductive portion is connected to the plurality of magnetic pole pieces via the non-conductive portion.

First claim

What is claimed is:

1 . A magnetic modulation gear comprising:
a plurality of outer pole magnets that are arranged in a circumferential direction; a plurality of magnetic pole pieces that are provided radially inward of the plurality of outer pole magnets and arranged in the circumferential direction; and a plurality of inner pole magnets that are provided radially inward of the plurality of magnetic pole pieces and arranged in the circumferential direction, wherein the magnetic modulation gear further includes a shaft member that is connected to the plurality of magnetic pole pieces, the shaft member includes a non-conductive portion and a conductive portion, and the conductive portion is connected to the plurality of magnetic pole pieces via the non-conductive portion.

2 . The magnetic modulation gear according to claim 1 ,
wherein a connection portion between the conductive portion and the non-conductive portion is located within a region radially outward of inner peripheral ends of the outer pole magnets or within a region radially inward of outer peripheral ends of the inner pole magnets.

3 . The magnetic modulation gear according to claim 1 ,
wherein a connection portion between the conductive portion and the non-conductive portion is located within a region that matches a region radially outward of inner peripheral ends of the outer pole magnets, a region radially inward of outer peripheral ends of the inner pole magnets, and a region spaced apart from the magnetic pole pieces by 3 mm or more in an axial direction.

4 . The magnetic modulation gear according to claim 1 , further comprising:
a connection member that connects the non-conductive portion and the conductive portion to each other, or a conductive member that is connected to a rotor integrated with the shaft member, wherein the connection member or the conductive member is located within a region that matches a region radially outward of inner peripheral ends of the outer pole magnets, a region radially inward of outer peripheral ends of the inner pole magnets, and a region spaced apart from the magnetic pole pieces by 3 mm or more in an axial direction.

5 . The magnetic modulation gear according to claim 1 ,
wherein the plurality of outer pole magnets are concentrically disposed on an outer diameter side of the plurality of magnetic pole pieces with a predetermined gap.

6 . The magnetic modulation gear according to claim 5 ,
wherein the plurality of outer pole magnets have a larger number of poles than that of the plurality of inner pole magnets.

7 . The magnetic modulation gear according to claim 5 ,
wherein the plurality of outer pole magnets are arranged in the circumferential direction such that polarity directions are alternately different, and are attached to an inner peripheral surface of a casing via a yoke portion.

8 . The magnetic modulation gear according to claim 1 ,
wherein the number of the plurality of magnetic pole pieces is a sum of the number of pole pairs of the outer pole magnets and the number of pole pairs of the inner pole magnets.

9 . The magnetic modulation gear according to claim 8 ,
wherein the plurality of magnetic pole pieces are disposed at predetermined intervals in the circumference direction, and two magnetic pole pieces adjacent to each other in the circumferential direction are connected via a connection portion.

10 . The magnetic modulation gear according to claim 8 ,
wherein the plurality of magnetic pole pieces are disposed at predetermined intervals in the circumference direction, and two magnetic pole pieces adjacent to each other in the circumferential direction are connected via a non-magnetic body.

11 . The magnetic modulation gear according to claim 1 , further comprising:
an extension portion that extends from the plurality of magnetic pole pieces to a counter load side; and a ring member that is attached to an outer peripheral portion of the extension portion.

12 . A magnetic modulation gear comprising:
a plurality of outer pole magnets that are arranged in a circumferential direction; a plurality of magnetic pole pieces that are provided radially inward of the plurality of outer pole magnets and arranged in the circumferential direction; and a plurality of inner pole magnets that are provided radially inward of the plurality of magnetic pole pieces and arranged in the circumferential direction, wherein no conductor is provided in a region between inner peripheral ends of the plurality of outer pole magnets and outer peripheral ends of the plurality of inner pole magnets in a radial direction and having a distance of less than 3 mm from the magnetic pole pieces in an axial direction.

13 . The magnetic modulation gear according to claim 1 ,
wherein the conductive portion of the shaft member, a connection member, a conductive member, a conductor, or a plurality of the conductive portion, connection member, conductive member, and conductor are non-magnetic bodies.

14 . A gear motor comprising:
an electric motor; and the magnetic modulation gear according to claim 1 , which receives power from the electric motor.

Assignees

• Sumitomo Heavy Industries

Inventors

• Nakagawa Hiroki
• Yamamoto Taizo
• Minari Takahiro

Classifications

• H02K7/116

  with gears · CPC title

• H02K7/083

  radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence) · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K49/102 Primary

  Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact (magnetized gearings with physical contact F16H13/12, F16H49/005) · CPC title