METHOD AND DEVICE FOR TESTING THE TIGHTNESS OF AN ELECTRIC MACHINE STATOR CORE

• US 20130047748A1
• Filed: 10/26/2012
• Published: 02/28/2013
• Est. Priority Date: 04/29/2010
• Status: Active Grant

• Current Assignee: General Electric Technology GmbH (GE Aerospace)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Visintin, Massimiliano
• Granted Patent: US 9,148,045 B2
• Time in Patent Office: Days
• US Class Current: 73/862.381
• CPC Class Codes: G01B 17/02 for measuring thickness
• CPC Class Codes: G01B 7/04 specially adapted for measuring length or width of objects while moving
• CPC Class Codes: G01B 7/144 Measuring play on bearings
• CPC Class Codes: G01B 7/16 for measuring the deformation in a solid, e.g. by resistance strain gauge
• CPC Class Codes: G01M 7/00 Vibration-testing of structures; Shock-testing of structures G01M9/00 takes precedence
• CPC Class Codes: G01M 7/08 Shock-testing
• CPC Class Codes: G01N 2203/0039 Hammer or pendulum
• CPC Class Codes: G01N 2203/0617 Electrical or magnetic indicating, recording or sensing means
• CPC Class Codes: G01N 2203/0658 using acoustic or ultrasonic detectors
• CPC Class Codes: G01N 29/265 by moving the sensor relative to a stationary material
• CPC Class Codes: G01R 31/34 Testing dynamo-electric machines
• CPC Class Codes: G01R 31/343 in operation
• CPC Class Codes: H02K 15/00 Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
• CPC Class Codes: H02K 15/02 of stator or rotor bodies
• CPC Class Codes: H02K 2201/03 Machines characterised by aspects of the air-gap between rotor and stator

Abstract

A method is provided for testing the tightness of an electric machine stator core includes: introducing a test instrument that is connected to a movable support into an air gap between a stator core and a rotor, locally placing the test instrument and locally testing defined zones of the generator stator core. A device for carrying out the method is also provided.

Claims

1. Method for testing the tightness of an electric machine stator core, wherein the electric machine comprises a stator core and a rotor defining an air gap therebetween, the method comprising introducing a test instrument that is connected to a movable support into the air gap, locally placing the test instrument and locally testing defined zones of the generator stator core.

2. The method as claimed in claim 1, wherein tests are repeated a number of times at different axial and/or angular positions.

3. The method as claimed in claim 1, further comprising introducing a plate between the stator core iron sheets.

4. The method as claimed in claim 1, further comprising stressing the stator core iron sheets to make them vibrate and detecting the vibrations.

5. The method as claimed in claim 4, wherein vibrations are detected by detecting a signal generated by the vibrating stator core iron sheets.

6. Device, for testing the tightness of an electric machine stator core, comprising a movable support, insertable in an air gap between an electric generator stator core and a rotor, and a test instrument carried by the movable support and locally positionable to locally test defined zones of the generator stator core.

7. The device as claimed in claim 6, wherein said support is arranged to place the test instrument over at least half of an axial length of the gap.

8. The device as claimed in claim 7, wherein said support comprises a guide, circumferentially connectable to the generator along at least a portion of its gap, a cart movable along the guide, and an arm that is connected to the cart and carries the test instrument.

9. The device as claimed in claim 8, wherein said arm is an extendable arm.