Switched reluctance motor starting with constant acceleration
FAN Yi-fei，ZHU Xue-zhong
（College of Automation Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210000，China）
Abstract：Aiming at the problems of bearing failure caused by torque overshoot of switched resistance（SR） starter/generator systemexisted in starting stage，after the analysis of SR motor starting characteristics on the basis of mechanical properties of SR motors，therelevance between the character of electromagnetic torque changing with load torque and acceleration was established. In order to adjustthe SR motor's speed in nonlinear way，based on the two-dimensional table of torque from Ansoft，current and angle，a method of constant
acceleration by torque control was presented for known character of load torque. Based on the principal of PID control，a method ofconstant acceleration on PWM in witch the PI parameters and opening angle/turn-off angle change with rotating speed was presented forunknown character of load torque. By establishing the nonlinear model on Matlab/Simulink，the simulation of starting phase was tested.The experimental results show that the methods of constant acceleration can make electromagnetic torque follow load torque and improve
the reliability of the SR starter/generator system effectively.
Key words：switched resistance motor（SRM）；follow load torque；starting with constant acceleration