Secondary part of a synchronous motor having a protective device for magnets

Patent metadata

Field	Value
Publication number	US-9768659-B2
Application number	US-201514735551-A
Country	US
Kind code	B2
Filing date	Jun 10, 2015
Priority date	Jun 11, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A secondary part of a synchronous motor has a protective device for magnets. The secondary part has a plurality of magnets evenly spaced on a magnet support. The protective device has a web for insertion into the gap between adjacent magnets. The web has a first and second flange at its two ends, so that the web and the flanges form a double-T structure, and the flanges rest against outer edges of the adjacent magnets.

First claim

What is claimed is:

1. A secondary part of a synchronous motor, comprising:
a magnet support;
a plurality of magnets evenly spaced on the magnet support; and
a protective device having a web inserted into a gap between adjacent magnets, the web having a first flange at a first end and a second flange at a second end, the web and the flanges forming a double-T structure, the flanges resting against outer edges of the adjacent magnets.

2. The secondary part according to claim 1 , wherein the web includes or functions as a first spring element to center the web in the gap between the adjacent magnets.

3. The secondary part according to claim 1 , wherein the first flange includes a second spring element that clamps the protective device on the magnets with a force transversely to a magnetic path and compensates for variations in a length of the magnets transversely to the magnetic path.

4. The secondary part according to claim 1 , wherein the second flange includes projections that form defined contact points on outer edges of the magnets.

5. The secondary part according to claim 1 , wherein each of the flanges includes an edge, the edges together forming a channel to accommodate a cover of the magnets.

6. The secondary part according to claim 1 , wherein on an upper side facing away from the magnet support, the web includes a ridge arranged as a stop for two covers.

7. The secondary part according to claim 1 , wherein the flanges of two adjacent protective devices touch each other and form an uninterrupted protection for external edges of the magnets.

8. The secondary part according to claim 7 , wherein the flanges of two adjacent protective devices overlap in an overlapping region.

9. The secondary part according to claim 8 , wherein the overlapping region is formed such that no voids form in response to a change in distance between the flanges.

10. The secondary part according to claim 1 , wherein on a lower side facing the magnet support, the web has a notch adapted to receive excess adhesive.

11. The secondary part according to claim 1 , wherein the motor is arranged as a rotary motor.

12. The secondary part according to claim 1 , wherein the motor is arranged as a linear motor.

13. The secondary part according to claim 1 , wherein the motor is arranged as a linear motor including at least one curved portion.

14. A motor, comprising:
a secondary part, including:
a magnet support;
a plurality of magnets evenly spaced on the magnet support; and
at least one first protective device having a web inserted into a gap between adjacent magnets, the web having a first flange at a first end and a second flange at a second end, the web and the flanges forming a double-T structure, the flanges resting against outer edges of the adjacent magnets.

15. The motor according to claim 14 , wherein the motor is arranged as a linear motor, the motor further comprising at least one second protective device including a first web, a second web, a first flange at a first end, and a second flange at a second end, the webs and flanges of the second protective device enclosing an end magnet, the first web inserted in a gap between the end magnet and an adjacent magnet.

Assignees

• Etel Sa

Inventors

• Fernandes Goncalves José Manuel
• Grillon Jean-Yves

Classifications

• H02K2201/03

  Machines characterised by aspects of the air-gap between rotor and stator · CPC title

• H02K5/10 Primary

  with arrangements for protection from ingress, e.g. water or fingers · CPC title

• H02K1/17

  Stator cores with permanent magnets · CPC title

• H02K41/031 Primary

  of the permanent magnet type · CPC title