Linear motor and compressor equipped with linear motor

Patent metadata

Field	Value
Publication number	US-2016149477-A1
Application number	US-201514936997-A
Country	US
Kind code	A1
Filing date	Nov 10, 2015
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

A linear motor includes an armature with two magnetic poles arranged in the Z direction, and winding wires wound around the two magnetic poles, respectively, and a mover with a permanent magnet, which moves relative to the armature in the Z direction. A first auxiliary magnetic pole is disposed between the two magnetic poles, and a bridge is disposed between the first auxiliary magnetic pole and the magnetic pole. The two winding wires are electrically coupled.

First claim

What is claimed is:

1 . A linear motor comprising:
an armature including two magnetic poles arranged in a Z direction, and winding wires wound around the two magnetic poles, respectively; and
a mover with a permanent magnet, which moves relative to the armature in the Z direction,
wherein a first auxiliary magnetic pole is disposed between the two magnetic poles;
a bridge is disposed between the first auxiliary magnetic pole and the magnetic pole; and
the two winding wires are electrically coupled.

2 . The linear motor according to claim 1 , wherein magnetic fluxes generated by currents flowing through the two winding wires are oppositely directed.

3 . The linear motor according to claim 1 , wherein conductivity and permeability of the armature in X and Y directions are higher than conductivity and permeability in the Z direction.

4 . The linear motor according to any one of claim 1 , wherein the bridge is a non-magnetic substance.

5 . The linear motor according to any one of claim 1 ,
wherein the first auxiliary magnetic pole has a space communicated in the Z direction; and the space is equivalent in size to or more than an XY dimension of the winding wire when seen from the Z direction.

6 . The linear motor according to any one of claim 1 , wherein a second auxiliary magnetic pole is provided at an outer side of at least one of the two magnetic poles in the Z direction via an end bridge.

7 . The linear motor according to any one of claim 1 , wherein another two magnetic poles and another first auxiliary magnetic pole are provided opposite the two magnetic poles, and the first auxiliary magnetic pole in the Y direction, respectively.

8 . A compressor comprising:
the linear motor according to any one of claim 1 ; a cylinder block; a first fixing member which is inserted into an insertion hole of the armature in the Z direction; and a second fixing member which is inserted into insertion holes of the cylinder block and the armature in the Z direction.

9 . The compressor according to claim 8 , wherein the second fixing member is allowed to be screwed with an insertion hole of a member attached to an end of the armature in the Z direction.

10 . The compressor according to claim 8 , wherein the cylinder block and the armature are fixed to form substantially a rectangular parallelepiped shape.

Assignees

• Hitachi Ltd

Inventors

• Nagata Shuhei
• Koyama Masaki
• Suzuki Takahiro
• Aoyama Yasuaki

Classifications

• H02K41/031 Primary

  of the permanent magnet type · CPC title

• F04B39/122

  Cylinder block · CPC title

• H02K1/14

  Stator cores with salient poles · CPC title

• F04B35/045

  using solenoids · CPC title

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title