Design Of Drive Circuit For A Transverse Flux Motor And The Dead-time Compensation For Inverter

In the current condition of increasingly serious energy and environmental problems,Electric vehicles have attracted more and more researchers' s attention with the development of vehicle electrification.Research and development investment is increasing conducted by the governments and automobile companies all around the world.Nowdays the development of electric vehicles has become the mainstream of the automotive industry.Transverse-flux permanent magnet machine(TFPM)is developed for its merit of high torque density,high freedom of design,decoupling of circuit and magnetic.This paper focuses on transverse flux permanent magnet machine power system design and dead-time compensation of inverter,aiming to lay a foundation for the popularization and application of transverse flux permanent magnet machine in electric vehicle,which means a lot on theoretical research and engineering application.Based on the opto-coupler HCPL4504 and the integrated chip UCC27321,A power drive circuit is designed for a transverse flux motor using MOSFET as power devices in this paper,The circuit has the characteristics of simple and reliable peripheral circuit.At the same time,the RCD snubber circuits is also designed to suppress voltage spikes across the MOSFET.Then,the overall structure,drive circuit design and key parameters' determination is described in detail.At last,the experimental testing of suggested drive circuit and snubber circuits is accomplished to verify their practicality and effectiveness for a transverse flux motor,its rated power is 900 W.For the voltage source inverter,the rising and falling of inverter output voltage can't be realized immediately due to the existence of parasitic capacitor of power switching device.However,for the conventional dead-time compensation method,the effects of parasitic capacitor on dead-time compensation is not taken into consideration,and therefore,results in a unsatisfactory compensation effects,moreover,it exists the technical deficiency of over compensation because the current zero crossing point is difficult to judge.Therefore,the dead-time effect allowing for the influences of parasitic capacitor is first analyzed in this paper,then,for the surface mounted Transverse-flux permanent magnet machine(TFPM)drive system,the detailed equations are deduced to calculate the inverter output ripple current,the inverter dead-time compensation method based on the calculated ripple current is then proposed.Finally,for TFPM drive systems with different dead-time compensation methods,the technical advantages of proposeddead-time compensation method is validated by system modeling,system simulation and experiment researches.