Resolver

Patent metadata

Field	Value
Publication number	US-2017199057-A1
Application number	US-201415324793-A
Country	US
Kind code	A1
Filing date	Aug 21, 2014
Priority date	Aug 21, 2014
Publication date	Jul 13, 2017
Grant date	—

Abstract

In a related-art resolver, a front and a back of a stator core cannot be distinguished, and it is difficult to mass-produce the resolver while matching directions of shear drops and burrs. Thus, assembly accuracy of the resolver is degraded. Further, productivity and assembling ability are degraded because electromagnetic steel sheets are laminated by rotary lamination. The present invention provides a resolver including: a resolver stator including: a stator core formed of electromagnetic steel sheets, which have teeth, and are laminated without rotary lamination; a one-phase excitation winding; and two-phase output windings; and a resolver rotor arranged to be opposed to the resolver stator, in which the stator core has marks which enable distinction of a rolling direction of the stator core and distinction of a front and a back of the stator core.

First claim

1 . A resolver, comprising:
a resolver stator comprising:
a stator core formed of electromagnetic steel sheets, which have teeth and are laminated without rotary lamination;
a one-phase excitation winding; and
two-phase output windings; and
a resolver rotor arranged to be opposed to the resolver stator, wherein the stator core has marks which enable distinction of a rolling direction of the stator core and distinction of a front and a back of the stator core.

2 . A resolver according to claim 1 ,
wherein, when the stator core is rotated about a rotation shaft of the resolver rotor by an arbitrary angle larger than 0 degrees and smaller than 360 degrees so that the teeth overlap each other, a position of at least one of the marks does not match to positions of the other marks before and after rotation, and wherein, when the stator core in a reversed state is rotated about the rotation shaft of the resolver rotor by the arbitrary angle, and then the stator core in an unreversed state and the stator core in the reversed and rotated state are arranged so that the teeth overlap each other, a position of at least one of the marks does not match to positions of the other marks.

3 . A resolver according to claim 1 , wherein the marks are placed on any one of an axial end surface of the stator core, and a peripheral surface of the stator core opposite to one of surfaces of the resolver rotor and the resolver stator opposed to each other through a gap.

4 . A resolver according to claim 1 , wherein the marks are placed on a core back of the stator core.

5 . A resolver according to claim 1 , wherein the marks are arranged equiangularly.

6 . A resolver according to claim 1 , wherein centers of the marks are at equivalent radial positions, respectively.

7 . A resolver according to claim 1 , wherein the centers of the marks are each positioned on a circumferential center line of one of the teeth.

8 . A resolver according to claim 1 , wherein the centers of the marks are each positioned at a middle portion between circumferential centers of adjacent teeth.

9 . A resolver according to claim 1 , wherein the number of the marks is equal to the number of the teeth.

10 . A resolver according to claim 1 , wherein the marks comprise combination of a mark that serves as joining means and a mark that does not serve as the joining means.

11 . A resolver according to claim 10 , wherein the mark that serves as the joining means and the mark that does not serve as the joining means have the same size.

12 . A resolver according to claim 1 , wherein circumferential center lines of arbitrary teeth and the rolling direction of the stator core match to each other.

13 . A resolver according to claim 12 , wherein the arbitrary teeth comprise predetermined teeth satisfying that an absolute value of the number of turns is maximum or minimum in any one of the two phases of the output windings.

14 . A resolver according to claim 12 ,
wherein the mark that does not serve as the joining means is placed on a portion of the core back located at every one of the arbitrary teeth, and wherein the mark that serves as the joining means is placed on at least one portion of the core back located at a tooth other than the arbitrary teeth, or neither the mark that serves as the joining means nor the mark that does not serve as the joining means is placed on a portion of the core back located at a tooth other than the arbitrary teeth.

15 . A resolver according to claim 12 ,
wherein the mark that serves as the joining means is placed on a portion of the core back abutting on every one of the arbitrary teeth, and wherein neither the mark that serves as the joining means nor the mark that does not serve as the joining means is placed on at least one portion of the core back abutting on a tooth other than the arbitrary teeth.

Assignees

• Mitsubishi Electric Corp

Inventors

• Morita Yusuke
• Yamamoto Atsushi
• Fujita Masahiko
• Motoishi Naohiro
• Ito Kazumasa
• Nakano Masatsugu

Classifications

• G01D5/2066 Primary

  by movement of a single coil with respect to a single other coil · CPC title

• H02K24/00 Primary

  Machines adapted for the instantaneous transmission or reception of the angular displacement of rotating parts, e.g. synchro, selsyn · CPC title