DEVICE AND METHOD FOR MEASURING A MAGNETIC FIELD IN AN AIR-GAP BETWEEN A STATOR AND A ROTOR OF AN ELECTRIC MACHINE

• US 20140225601A1
• Filed: 12/20/2013
• Published: 08/14/2014
• Est. Priority Date: 12/20/2012
• Status: Abandoned Application

• Current Assignee: General Electric Technology GmbH (GE Vernova, Inc.)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: HOBELSBERGER, Maximilian, MOSER, Roland Richard, HONOLD, Simon Christoph
• Application Number:
  US14/135,631
• Publication Number:
  US 20140225601A1
• Time in Patent Office: Days
• US Class Current: 324/222
• CPC Class Codes: G01R 31/34 Testing dynamo-electric machines
• CPC Class Codes: G01R 31/343 in operation
• CPC Class Codes: G01R 33/0283 in which a current or voltage is generated due to relative movement of conductor and magnetic field

Abstract

A device for measuring a magnetic field in an air-gap between a stator and a rotor of an electric machine includes a probe to detect the magnetic field and generate a signal indicative thereof and a display unit for the signal. The probe includes a plurality of sensors.

Claims

1. A device for measuring a magnetic field in an air-gap between a stator and a rotor of an electric machine, the device comprising a probe to detect the magnetic field and generate a signal indicative thereof and a display unit for the signal, wherein the probe includes a plurality of sensors.

2. The device of claim 1, wherein the plurality of sensors are aligned along at least one row.

3. The device of claim 1, wherein the sensors include inductive sensors, preferably inductive coils.

4. The device of claim 1, wherein the sensors include Hall sensors and/or magneto-resistive sensors.

5. The device of claim 1, wherein the sensors have different sensitivity in different directions.

6. The device of claim 1, wherein the sensors define two or more superposed layers.

7. The device of claim 1, wherein the probe includes a support that carries the sensors.

8. The device of claim 7, wherein the support is a flexible support.

9. The device according to claim 1, further comprising an excitation unit for generating a localised magnetic field.

10. The device of claim 1, further comprising at least one infrared sensor.

11. A method for measuring a magnetic field in an air-gap between a stator and a rotor of an electric machine, the method comprising providing a device according to claim 1, magnetizing at least a portion of the stator, moving the device on the stator bore, detecting the magnetic field generated by eddy currents that are generated by interlamination short circuits in the stator.

12. The method according to claim 11, further comprising magnetizing the whole stator.

13. The method according to claim 11, further comprising locally magnetizing the stator.