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The multiplex 3-phase winding motors suffer from the problem of the magnetic coupling between the normal winding and the fault winding. To investigate the behaviors of the dual-winding PMSMs on the short-circuited fault conditions, a fault analysis model is developed that includes a dual-winding PMSM circuit model with a short-circuited fault coil within some phase coil and an inverter model with...
This paper presents a failure analysis procedure on a power MOSFET in a three phase inverter. The analyzed power MOSFET has been obtained from a chopper leg in a three phase inverter when an anomalous failure is detected. At first, the X-ray microscope is utilized to inspect the failed device. A hint of the burn-out area in the chip is observed in the cross-section X-ray microscopy image. After that,...
This text aims to solve such problems as the large pulsation of battery electric locomotive traction motor torque at low speed, the unpredictable frequency spectrum of the torque, and the large frequency and wastage of high-speed inverter switching. Starting from space voltage vector, this text adopts the method of multiple vector synthesis and mutual switch control of motor air-gap flux according...
The author first analyses the energy conversion of wind power generation and the main factor of influencing output power from the perspective of energy conversion and equilibrium. With the method of coordinate transformation, the output power is decomposed into active component and reactive component. Then based on the ideas of optimal control of wind and electric energy conversion, the relation expression...
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