Patent ID: 11933850
Assignee: HANGZHOU HENUOVA TECHNOLOGY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The method for detecting a slot wedge, an air gap and a broken rotor bar in a magnetic circuit of electric machinery according to claim 3, wherein step (6) specifically comprises:
calibrating a position of the rotor,
acquiring and recording a waveform for a first time,
rotating the rotor by turning, and acquiring and recording a waveform for a second time under same working parameters,
comparing the two waveforms, and
determining whether a squirrel cage rotor has a broken bar through a waveform change, wherein
if the two waveforms are consistent and coincide well, determining that the squirrel cage rotor is intact; and
if the two waveforms are significantly different only at a special position, determining that the squirrel cage rotor has a broken bar.