Linear motor and linear motor manufacturing method

Patent metadata

Field	Value
Publication number	US-2016359402-A1
Application number	US-201615172367-A
Country	US
Kind code	A1
Filing date	Jun 3, 2016
Priority date	Jun 5, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

This disclosure discloses a linear motor including a stator, a mover, and a plurality of teeth. The stator includes a stator curved part having an arc shape in a longitudinal direction. The mover is arranged facing the stator and is moved in the longitudinal direction of the stator. The plurality of teeth are arranged in parallel along the longitudinal direction so that a pitch of the teeth at an outer-peripheral side is larger than the pitch of the teeth at an inner-peripheral side on the stator curved part.

First claim

What is claimed is:

1 . A linear motor comprising:
a stator comprising a stator curved part having an arc shape in a longitudinal direction; a mover arranged facing the stator and moved in the longitudinal direction of the stator; and a plurality of teeth arranged in parallel along the longitudinal direction so that a pitch of the teeth at an outer-peripheral side is larger than the pitch of the teeth at an inner-peripheral side on the stator curved part.

2 . The linear motor according to claim 1 ,
wherein the plurality of teeth are arranged radially from a curvature center of the stator curved part in the stator curved part.

3 . The linear motor according to claim 2 ,
wherein the stator is constituted by laminating a plurality of sheet steels in a width direction orthogonal to the longitudinal direction.

4 . The linear motor according to claim 3 ,
wherein the stator curved part is constituted so that, on the basis of the pitch of the teeth in the longitudinal direction on the sheet steel located approximately at a center of the width direction, the closer to the outer peripheral side the sheet steel is located, the larger the pitch is set, while the closer to the inner peripheral side the sheet steel is located, the smaller the pitch is set.

5 . The linear motor according to claim 4 ,
wherein the stator curved part is constituted by laminating the sheet steels each formed in the arc shape.

6 . The linear motor according to claim 4 ,
wherein the stator curved part is constituted so that the stator curved part has the arc shape by connecting a plurality of stator dividing linear parts each having a linear shape in the longitudinal direction to each other in a circumferential direction.

7 . The linear motor according to claim 6 ,
wherein in each of the sheet steels of the stator dividing linear part, the farther away from a reference position in the longitudinal direction the teeth are located, the larger the pitch of the teeth is.

8 . The linear motor according to claim 1 ,
wherein the stator curved part comprises a predetermined number N (1≦N as an integer) of the teeth arranged parallel with each another and a plurality of stator dividing linear parts each having a linear shape in the longitudinal direction, wherein the stator dividing linear part is formed in a trapezoidal shape in which one of edge portions in a width direction orthogonal to the longitudinal direction is a short side and another edge portion is a long side, and wherein the stator curved part is constituted by connecting each of the stator dividing linear parts so that the short sides are disposed adjacent to each other on the inner peripheral side of the stator curved part.

9 . The linear motor according to claim 8 ,
wherein the plurality of stator dividing linear parts are arranged radially from a curvature center of the stator curved part.

10 . The linear motor according to claim 1 , further comprising:
an induction part configured to regulate a moving path of the mover, wherein the induction part regulates the moving path so that, in the stator curved part, the mover moves on a track in which a center position in a width direction orthogonal to the longitudinal direction on both end portions of the mover in the longitudinal direction approximately matches the center position in the width direction in the stator curved part.

11 . The linear motor according to claim 1 ,
wherein the stator comprises:
a substrate part; and
the plurality of teeth each having a columnar shape and arranged on the substrate part and being separate from the substrate part.

12 . A linear motor manufacturing method comprising:
when a plurality of sheet steels each comprising a plurality of teeth formed in a longitudinal direction is laminated in a width direction orthogonal to the longitudinal direction so as to form a stator, laminating the sheet steels so that a pitch of the teeth on the sheet steel on an outer peripheral side is larger than the pitch of the teeth on the sheet steel on an inner peripheral side; and forming a stator curved part having an arc shape in the longitudinal direction.

13 . The linear motor manufacturing method according to claim 12 ,
wherein the forming the stator curved part comprises:
forming the teeth by increasing the pitch for each one round of a roll while winding the sheet steel in a roll state; and
dividing the roll of the sheet steel at a predetermined circumferential angle.

14 . The linear motor manufacturing method according to claim 12 ,
wherein the forming the stator curved part comprises
connecting a plurality of stator dividing linear parts each having a linear shape in the longitudinal direction to each other in a circumferential direction.

15 . The linear motor manufacturing method according to claim 14 ,
wherein the forming the stator curved part comprises
forming the teeth on each of the sheet steels of the stator dividing linear part so that the farther away from a reference position in the longitudinal direction the teeth are located, the larger the pitch of the teeth is.

16 . The linear motor manufacturing method according to claim 14 ,
wherein the forming the stator curved part comprises:
forming the stator dividing linear part in a trapezoidal shape in which one of edge portions in the width direction is a short side and another edge portion is a long side; and
connecting each of the stator dividing linear parts so that the short sides are disposed adjacent to each other on the inner peripheral side of the stator curved part.

17 . The linear motor manufacturing method according to claim 12 , further comprising
forming the sheet steel by punching a sheet steel strip by using a press die capable of forming a sectional shape of the teeth.

18 . The linear motor manufacturing method according to claim 17 ,
wherein the forming the sheet steel comprises
forming an emboss for clamping by using the press die.

Assignees

• Yaskawa Electric Corp

Inventors

• Makino Shogo
• Shikayama Toru
• Kakihara Masanobu
• Hirayama Masayuki
• Yahara Haruki

Classifications

• H02K1/12

  Stationary parts of the magnetic circuit · CPC title

• H02K41/02 Primary

  Linear motors; Sectional motors · CPC title

• H02K15/02

  of stator or rotor bodies · CPC title

• H02K5/04

  Casings or enclosures characterised by the shape, form or construction thereof · CPC title

• H02K1/02

  characterised by the magnetic material · CPC title