Linear motor

Patent metadata

Field	Value
Publication number	US-9774238-B2
Application number	US-201514687328-A
Country	US
Kind code	B2
Filing date	Apr 15, 2015
Priority date	Oct 22, 2014
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A linear motor includes a stator and a rotor. The stator includes two opposing plates, a spacing plate positioned between the plates, and a plurality of permanent magnets mounted on the two plates and spaced from each other. The rotor includes a coil portion and an assembly block. The coil portion is positioned between the two plates, and the assembly block is connected to the coil portion and next to the plates. The spacing plate defines a slide groove, and the coil portion includes a plurality of balls mounted at one surface toward the spacing plate. The plurality of balls is partially received in the slide groove in the sliding way.

First claim

What is claimed is:

1. A linear motor comprising:
a stator having two plates positioned to face each other, a spacing plate positioned between the plates, and a plurality of permanent magnets mounted on the two plates, and the permanent magnets mounted on the two plates being facing each other; and
a rotor having a coil portion positioned between the two plates, and an assembly block connected to the coil portion and adjacent to the plates;
wherein the spacing plate defines a slide groove, a bottom surface of the slide groove is a semicircle, the coil portion comprises a plurality of balls, and the plurality of balls is mounted at one surface of the coil portion toward the bottom surface of the slide groove of the spacing plate and away from the assembly block; and
wherein the plurality of balls is partially received in the slide groove in a sliding way to keep a gap between the stator and the rotor.

2. The linear motor as claimed in claim 1 , wherein the slide groove extends along a direction substantially parallel to the plates.

3. The linear motor as claimed in claim 1 , wherein a length of the slide groove is substantially same with a length of the spacing plate.

4. The linear motor as claimed in claim 1 , wherein the surface of coil portion toward the spacing plate defines a plurality of receive holes, and each of the plurality of the balls is partially received in the corresponding receive hole.

5. The linear motor as claimed in claim 4 , wherein the receive holes are integrally formed with the coil portion.

6. The linear motor as claimed in claim 5 , wherein the coil portion is made of epoxy resin.

7. The linear motor as claimed in claim 1 , wherein the balls are spherical.

8. The linear motor as claimed in claim 1 , wherein the balls are substantially cylinder shaped.

9. The linear motor as claimed in claim 1 , wherein the balls are evenly spaced from each other.

10. The linear motor as claimed in claim 1 , wherein the two plates are flat plates, and the spacing plate is a strip shaped plate.

Assignees

• Hon Hai Prec Ind Co Ltd

Inventors

• Chen Po-Kuang
• Wang Chang-Sheng
• Chen Mi-Chien

Classifications

• H02K41/031 Primary

  of the permanent magnet type · CPC title

• H02K7/08

  Structural association with bearings · CPC title

• H02K5/173

  using bearings with rolling contact, e.g. ball bearings · CPC title