Electric machine

Patent metadata

Field	Value
Publication number	US-9306441-B2
Application number	US-201214234882-A
Country	US
Kind code	B2
Filing date	Jul 20, 2012
Priority date	Jul 25, 2011
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

The invention relates to an electric machine ( 101 ) comprising a stator ( 103 ), a rotatably mounted rotor ( 105 ) having a magnetizable and coolable rotor section ( 107 ) made of a super-conducting material ( 417 ), a control unit ( 109 ) designed to control a stator flow for inducing a magnetic flow through the superconducting material ( 417 ). The invention also relates to a method for operating an electric machine ( 101 ).

First claim

The invention claimed is:

1. An electric machine, comprising:
a stator;
a rotatably mounted rotor having a plurality of coolable and magnetizable rotor sections made of a superconducting material;
a controller configured to control a stator current for inducing a magnetic flux through the superconducting material;
wherein the rotor sections are arranged in opposing pairs such that they form opposite poles of a magnetic field and each fashioned from one or more tiles made of the superconducting material; and
a heater arranged on each of the rotor sections for heating the rotor section to a temperature above a critical temperature of the superconducting material.

2. The electric machine of claim 1 , wherein the controller is configured to control the stator current as a function of a temperature of the superconducting material.

3. The electric machine of claim 1 , wherein the controller is configured to control the stator current as a function of a rotor magnetic field.

4. The electric machine of claim 1 , wherein the rotor comprises a pole core coolable by a cooling fluid, said rotor section being arranged on the pole core.

5. The electric machine of claim 4 , further comprising a thermal connecting layer formed between the pole core and the rotor section.

6. The electric machine of claim 1 , wherein the heater is formed as a heating foil.

7. A method for operating an electric machine including a stator and a rotatably mounted rotor having a plurality of coolable, magnetizable rotor sections made of a superconducting material, said method comprising:
forming a magnetic flux through the superconducting material by controlling a stator current for inducing the magnetic flux in the superconducting material;
cooling the superconducting material, after formation of the magnetic flux, to a temperature below a critical temperature of the superconducting material to fix the magnetic flux;
arranging the rotor sections in opposing pairs such that they form opposite poles of a magnetic field and each fashioned from one or more tiles made of the superconducting material; and
heating each of the rotor sections to a temperature above a critical temperature of the superconducting material by a heater provided on each of the rotor sections.

8. The method of claim 7 , wherein the stator current is controlled as a function of a temperature of the superconducting material.

9. The method of claim 7 , wherein the stator current is controlled as a function of a measured rotor magnetic field.

Assignees

• Kummeth Peter
• Schmidt Heinz
• Siemens Ag

Inventors

• Kummeth Peter
• Schmidt Heinz

Classifications

• Y02E40/60

  Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment · CPC title

• H02P29/005

  Electricity · mapped topic

• H02P29/0061

  Electricity · mapped topic

• Y02E40/625

  Cross-Sectional Technologies · mapped topic

• H02K55/00 Primary

  Dynamo-electric machines having windings operating at cryogenic temperatures · CPC title