Stator core loosening diagnosis device and stator core loosening diagnosis method
US7854167B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2008 |
| Grant date | Dec 21, 2010 |
| Priority date | — |
| Expiry date | Jul 5, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K15/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A diagnosis device for diagnosing loosening of a stator core of a rotary electrical machine. The diagnosis device has: excitation means for vibrating the stator core in the radial direction; vibration detection means for detecting the vibration of the stator core in the radial direction; means for frequency-analyzing an output signal of the vibration detection means that detects vibration generated in the stator core when the stator core is vibrated by the excitation means so as to extract a measurement natural vibration mode of the stator core in a circular ring natural vibration mode; means for estimating a circular ring natural vibration mode of the stator core from shape data of the stator core; and means for determining a clamping state of the stator core by comparing the measurement natural vibration mode and a determination criterion obtained based on the estimated natural vibration mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.