Title:
DIAGNOSTIC DEVICE FOR ELECTRIC MOTOR
Document Type and Number:
WIPO Patent Application WO/2019/003389
Kind Code:
A1
Abstract:
In the present invention, when a current from a current input unit (71) for detecting the current of an electric motor (5) is in a stable state, the power spectrum of the current is analyzed by an FFT analysis unit (8402). A plurality of the power spectrums analyzed by the FFT analysis unit (8402) are averaged by an averaging calculation unit (8406), and a sideband wave of the averaged power spectrum is extracted by a sideband wave extraction unit (8407). When a sideband wave having a signal strength of at least a set value is extracted by the sideband wave extraction unit (8407), an alarm is outputted from an alarm output unit (85).
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Inventors:
MIYAUCHI TOSHIHIKO (JP)
Application Number:
PCT/JP2017/023993
Publication Date:
January 03, 2019
Filing Date:
June 29, 2017
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02P29/024
Foreign References:
| JP2016195524A | 2016-11-17 | |||
| JP2015179030A | 2015-10-08 | |||
| JP4782218B2 | 2011-09-28 |
Other References:
See also references of EP 3648338A4
Attorney, Agent or Firm:
OIWA Masuo et al. (JP)
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