Research On Driver Characteristic Of Actuator Based On Permanent Magnet Synchronous Motor

The development of electromechanical actuator with high power density and reliability is an important direction for all-electric aircraft control system which replaces traditional hydraulic transmission or pneumatic transmission system by reliable and efficient motor control system. The key questions for electromechanical actuator’s development are the power density and reliability. PMSM can perform high reliability and power density with small size and light weight, so it is very suitable for electromechanical actuators. However,PMSM is a non-linear system with strong coupled multivariable quantities, magnetic saturation affects the performance of motor control. In this paper, magnetic saturation is considered in the research of PMSM actuator’s characteristics, and a saturation compensation control strategy is designed to improve electromechanical actuator’s torque output accuracy and dynamic response performance.First, the PMSM model is analyzed using finite element software to extract motor current,flux and electromagnetic torque curve considering magnetic saturation. A mathematical model considering cross asymmetric magnetic saturation is established and tested on Matlab simulation platform. By comparison to linear motor model, model considering cross asymmetric magnetic saturation performs closer to actual situation.Secondly, The difference of motor drive current and torque are researched between linear model and magnetic saturation model in the case of motor heavy loadFinally, in order to improve motor driving characteristics in the case of heavy load, a sort of saturation compensation control strategy is designed to compensate the magnetic saturation effects in the heavy load mode which causes the decline of actuator performance, with this strategy actuator’s torque output accuracy and dynamic response performance are improved in the case of heavy load.