Design Of The Permanent Magnet Synchronous Motor Servo Control System Based On SPC 1068

Permanent magnet synchronous motor(PMSM)has many advantages,such as simple structure,small volume,high power density,high efficiency and reliable operation.It has been widely applied in many fields,such as industrial manufacturing,transportation,household appliances,servo systems and so on.The position sensorless control technology of PMSM can reduce the cost of the system and improve the reliability of the system,which makes it a hot spot in the field of the motor control.In this thesis,a vector control system is designed for the surface-mounted permanent magnet synchronous motor(SPMSM).The high frequency voltage injection method is applied in low speed region,and the improved sliding mode observer(SMO)is applied in middle and high speed regions,and the sensorless control is realized.The development and research status of PMSM and its control technology are introduced,and the position sensorless control technology is emphatically analyzed.The mathematical models of PMSM under three kinds of coordinate systems are established.The principles of coordinate transformation and vector control are introduced.Several vector control strategies are compared and analyzed.The id=0 control strategy is selected,and the simulation model is built in MATLAB/Simulink.The saturation saliency principle of SPMSM is analyzed.The principles of fluctuating high frequency voltage injection and high frequency square wave injection are introduced,and these two methods are compared by simulation analysis.In middle and high speed regions,to improve the traditional SMO,the traditional sgnum function is replaced by the arctangent function to reduce the chattering in sliding mode operation.The phase-locked loop is introduced to estimate the speed and angle of the rotor.Simulation models are built in MATLAB/Simulink.The thesis introduces the SPC 1068 chip.The hardware and software of the controller are designed.A vector control experiment platform is built,on the basis of which the experimental verifications are carried out.The vector control with position sensor,low speed region based on high frequency signal injection and middle and high speed regions position sensorless vector control based on SMO are carried out respectively.The experimental results verify the effectiveness and feasibility of the control method: the high frequency voltage injection method can accurately estimate the rotor position in low speed region and the improved SMO can achieve to observe the position of the rotor in middle and high speed regions.The sensorless vector control of motor is realized.