Magnet component with a thermal insulation structure, rotor assembly with such a magnet component, electromechanical transducer and wind turbine

Patent metadata

Field	Value
Publication number	US-9490672-B2
Application number	US-201313850359-A
Country	US
Kind code	B2
Filing date	Mar 26, 2013
Priority date	Mar 26, 2012
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A magnet assembly for a rotor assembly of an electromechanical transducer includes a magnet component and a thermal insulating structure. The magnet component has a permanent magnet material. The thermal insulation structure covers at least a part of a surface of the magnet component for thermally decoupling the magnet component from heat being generated within electromechanical transducer. In an example embodiment, the electromechanical transducer is a generator of a wind turbine.

First claim

The invention claimed is:

1. A magnet assembly for a rotor assembly of an electromechanical transducer, the magnet assembly comprising:
a magnet component comprising a permanent magnet material, wherein the magnet component is mounted to a base element,
a thermal insulation structure covering at least a part of a surface of the magnet component for thermally decoupling the magnet component from heat being generated within electromechanical transducer;
wherein the thermal insulation structure comprises a thermal insulating material and an enclosure structure, wherein the thermal insulating material surrounds the magnet component except where the magnet component is mounted to the base element and spatially separates the magnet component from the enclosure structure along an entire surface of the magnet component not mounted to the base element, and
wherein the enclosure structure encloses both the magnet component and the thermal insulating material not mounted to the base element.

2. The magnet assembly according to claim 1 , wherein the base element, comprises:
a front surface being attached to the magnet component surface, and
a back surface for mounting the magnet assembly to a support structure of the rotor assembly.

3. A rotor assembly for an electromechanical transducer, the rotor assembly comprising:
a support structure,
at least one magnet assembly as set forth in claim 2 ,
wherein the back surface of the at least one magnet assembly is mounted to the support structure.

4. The rotor assembly according to claim 3 , further comprising:
at least one further magnet assembly,
wherein the magnet assembly and the further magnet assembly are mounted next to each other at the support structure,
wherein the thermal insulation structure is a common thermal insulation structure both for the magnet assembly and the further magnet assembly, and
wherein the thermal insulation structure is located exclusively in between a space between the magnet assembly and the further magnet assembly.

5. An electromechanical transducer, comprising
a stator assembly, and
a rotor assembly as set forth in claim 3 .

6. The electromechanical transducer of claim 5 , wherein the electromechanical transducer is the generator of a wind turbine.

7. The magnet assembly according to claim 1 , wherein the thermal insulating structure comprises a sandwich structure of at least one layer of a thermal insulating material and at least one layer of a thermal radiation reflecting material.

8. The magnet assembly according to claim 1 , wherein the thermal insulating material is a porous material.

9. The magnet assembly according to claim 8 , wherein the thermal insulating material comprises at least one of the group consisting of polyurethane foam, phenol foam, aerogel, mineral wool, glass wool, silica lime sand brick and clay.

10. The magnet assembly according to claim 1 , wherein between the enclosure structure and the magnet component there is formed a free space.

Assignees

• Siemens Ag

Inventors

• Airoldi Giovanni
• Soerensen Peter Hessellund
• Stiesdal Henrik

Classifications

• H02K7/1838

  Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine · CPC title

• H02K1/27 Primary

  Rotor cores with permanent magnets · CPC title

• H02K2213/12

  Machines characterised by the modularity of some components · CPC title

• H02K5/128

  using air-gap sleeves or air-gap discs · CPC title

• H02K1/04

  characterised by the material used for insulating the magnetic circuit or parts thereof · CPC title