Title:
MOTOR DIAGNOSIS DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/142569
Kind Code:
A1
Abstract:
[Problem] To provide a motor diagnosis device capable of diagnosing whether there is an abnormality in a motor by detecting a sideband wave generated in a peak shape adjacent to a power supply frequency even when the motor has a varying load torque. [Solution] The current of a motor 5 is detected by a current detector 4 and is input from a current input unit 10. In a logical calculation unit 11, power spectrum analysis results, which have been obtained for a plurality of batches through a frequency analysis of the current waveform when the current is stable, are averaged; a sideband wave is detected from the averaged power spectrum analysis results ; a difference value between a power spectrum peak at the motor power supply frequency and a power spectrum peak in a rotation frequency band is calculated to thereby determine whether there is an abnormality in the motor 5; and when it is determined that there is an abnormality, an alarm is output from an alarm output unit 12.
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Inventors:
MIYAUCHI TOSHIHIKO (JP)
Application Number:
PCT/JP2017/003943
Publication Date:
August 09, 2018
Filing Date:
February 03, 2017
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02P29/024
Domestic Patent References:
| WO2016151708A1 | 2016-09-29 |
Foreign References:
| JP2016195524A | 2016-11-17 | |||
| JP5985099B1 | 2016-09-06 | |||
| JP2010288352A | 2010-12-24 |
Other References:
See also references of EP 3579404A4
Attorney, Agent or Firm:
OIWA Masuo et al. (JP)
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