Method and apparatus for testing dynamoelectric machine rotors
US5231348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Jun 19, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for testing dynamoelectric machine rotors, particularly squirrel cage rotors for induction motors, to obtain resistance, reactance, and effective skew values to permit identification of rotor defects. The rotor is rotated in an alternating magnetic field and pick-up coils are used to sense the voltage generated in the rotor by sensing the magnetic flux generated by magnetization of the rotor during rotation. Current sensing is used to determine the current used in magnetizing the rotor and a separate skew pick-up coil is utilized to detect effective electrical skew. These signals are processed to determine whether the rotor meets predetermined pass/fail criteria, to provide detailed statistical data and to generate a failure indication responsive to one of the values falling outside respective predetermined limits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.