Design, Analysis And Control Of Permanent Magnet Synchronous Motor In Electromechanical Actuator

In the new generation of more electricity and all electricity aerocraft, the application and research about electromechanical actuator become wider. Motor as electric power components, its performance affect the performance and reliability of electromechanical actuator greatly. Fractional slot concentrated winding PMSM (Permanent Magnet Synchronous Motor), which has strong fault tolerance because of the advantages of magnetic isolation, physical isolation, thermal isolation, electrical isolation and large inductance, has been widely applied to electromechanical actuator, and become the focus of research in the current motor areas. This thesis made detail theoretical analysis and simulation to this special structure PMSM, the main work and innovation are as follows:Firstly, the fault-tolerant technology and the structure of Fractional slot concentrated winding were analysed, the fractional slot concentrated winding permanent magnet synchronous motor must have an electrical isolation and physical isolation, and must use large motor phase inductance to limit short-circuit current. When there is a short circuit fault, the motor has a little or no mutual inductance to prevent the gemel magnetic flux between the normal phase and the short circuit phase. Through contradistinctive research, several rules of fault-tolerant design were achieved, which could guide the design of PMSM.Secondly, the inductance and harmonic of a three-phase 12-slot 10-pole fractional slot concentrated winding PMSM were researched. The mathematical model of the motor harmonic leakage inductance, magnetizing inductance, slot leakage inductance and tank leakage inductance were established. The magnetic circuit was analyzed and computed, and these design rules were verified through the analytical method and the finite element method. The results of simulation proved that it was fully accord with the requirements of electromechanical actuator when went to design the three-phase 12-slot 10-pole fractional slot concentrated winding PMSM by this way.Thirdly, the finite element analysis software Ansoft was used to design a three-phase 12-slot 10-pole fractional slot concentrated winding PMSM simulation model. Two-dimensional steady state analysis and transient analysis of the motor model was made.The results of simulation proved the fault-tolerant design principles were accurate and feasible again.Finally, through the research of the traditional PWM control strategy, a control algorithm was proposed which used the input of three-phase line voltage to determine the corresponding relationship of the traditional inverter switch and switch matrix converter. The indirect control strategy of matrix converter was researched based on traditional PWM control strategy, and it was applied to the space voltage vector control system of the fractional slot concentrated winding PMSM. The simulation models of this system were established by Matlab/simulink, and the simulation results showed that the control system was effective and could meet actual requirements.The results in this paper have some important academic and practical value, which could be used to provide reference for the research and design of PMSM.