US 11,933,850 B2
Device and method for detecting slot wedge, air gap and broken rotor bar in magnetic circuit of electric machinery
Yuewu Zhang, Hangzhou (CN); Weixing Yang, Hangzhou (CN); Boyan Zhao, Hangzhou (CN); Jie Luo, Hangzhou (CN); Gang Du, Hangzhou (CN); Chao Wang, Hangzhou (CN); Han Gao, Hangzhou (CN); Liwei Qiu, Hangzhou (CN); Ming Xu, Hangzhou (CN); Jiamin Li, Hangzhou (CN); Yanxing Bao, Hangzhou (CN); Qianyi Zhang, Hangzhou (CN); Zuting Cao, Hangzhou (CN); and Junliang Liu, Hangzhou (CN)
Assigned to HANGZHOU HENUOVA TECHNOLOGY CO., LTD., Hangzhou (CN)
Appl. No. 17/768,493
Filed by HANGZHOU HENUOVA TECHNOLOGY CO., LTD., Hangzhou (CN)
PCT Filed Aug. 2, 2021, PCT No. PCT/CN2021/110070
§ 371(c)(1), (2) Date Apr. 13, 2022,
PCT Pub. No. WO2022/037402, PCT Pub. Date Feb. 24, 2022.
Claims priority of application No. 202010829843.8 (CN), filed on Aug. 18, 2020.
Prior Publication US 2024/0044982 A1, Feb. 8, 2024
Int. Cl. G01R 31/34 (2020.01)
CPC G01R 31/34 (2013.01) 7 Claims
OG exemplary drawing
 
1. A device for detecting a slot wedge, an air gap and a broken rotor bar in a magnetic circuit of electric machinery, comprising
a sequential circuit configured to generate double concurrent pulses;
driving power modules connected to the sequential circuit;
front-end interface circuits, wherein the driving power modules are connected to the front-end interface circuits, the front-end interface circuits are configured to convert the double concurrent pulses into corresponding magnetic-field pulses, the magnetic-field pulses are transmitted to power supply terminals on adjacent phases of stator windings through impedance matching pins, and coupled at a corresponding coil, air gap and squirrel cage rotor to generate single groups of cyclic rotating magnetic potentials, single rotating magnetic potentials are sequentially generated in adjacent slots on each of the phases of the stator windings, rotating electric potentials in magnetic circuits with two symmetrical phases are magnetically coupled to form distributed coupling magnetic field reflected full-cycle waves for reflecting a difference of a corresponding slot wedge;
a waveform acquisition unit configured to acquire the distributed coupling magnetic field reflected full-cycle waves for comparison; and
the double concurrent pulses are symmetrical reverse synchronous pulses; the symmetrical reverse synchronous pulses are formed into closed magnetic circuits in a coaxial ultrahigh-frequency magnetic core through single pulses; and the symmetrical reverse synchronous pulses are generated in two coils through a transient magnetic coupling effect.