Hangzhou Henuova Technology Co., Ltd.

Junliang Liu

Yuewu Zhang

Qianyi Zhang

Jie Luo

Han Gao

Yanxing Bao

Weixing Yang

Chao Wang

Ming Xu

Xu Han

Dongbing Liu

Weihua Zha

Miaoye Li

Zirui Wang

Jiamin Li

Yu Fu

Jianxi Liu

Gang Du

Boyan Zhao

Liwei Qiu

Zuting Cao

Weitao Shen

A device and a method for nondestructively detecting a transient characteristic of a conductive screw of a turbo-generator rotor are provided. The device includes a personal computer (PC), an extremely-steep pulse generator, an ultra-high-frequency double-isolation transformer, and a pulse emitting and coupling module, which are connected in sequence. The pulse emitting and coupling module is connected to a load. A synchronous pulse receiving non-inductive divider circuit synchronously receives a characteristic waveform from the load, and the synchronous pulse receiving non-inductive divider circuit is connected to an ultra-high-speed analog/digital (A/D) module through a nonlinear saturation amplifying circuit that amplifies a signal. The PC receives a signal from the ultra-high-speed A/D module. The load includes a positive or negative excitation lead loop that is in a 180° symmetrical and instantaneous short-circuit state and a rotor shaft. The device detects state of the conductive screw in a blind area of electromagnetic wave test.

Device and method for nondestructively detecting transient characteristic of conductive screw of turbo-generator rotor

A device for detecting a slot wedge, an air gap and a broken rotor bar is provided, where a sequential circuit generates double concurrent pulses; the sequential circuit is connected to driving power modules; the driving power modules are connected to front-end interface circuits; the front-end interface circuits 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.

Device and method for detecting slot wedge, air gap and broken rotor bar in magnetic circuit of electric machinery

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Hangzhou, China

Junliang Liu