Research On High Performance Asynchronous Spindle Motor Control System

As one of the strategic core tasks for the successful realization of made in China 2025,it is urgent to improve the machining accuracy and efficiency of domestic CNC machine tools.Because of the demand of high speed,high torque and low cost,compared with permanent magnet synchronous motor,asynchronous spindle motor plays an important role in the field of CNC machine tools.Whether it can achieve high precision and fast positioning is the main performance index to inspect whether asynchronous motor can meet the relevant requirements of CNC machine tools.In the face of different machining requirements of different parts,the matching asynchronous spindle motor is required to have a wide range of speed regulation,with strong stability in the high-speed section,and to achieve accurate speed regulation and positioning in the low-speed section.Based on the industrial practice,this paper takes the high-performance asynchronous motor control system as the research object,and conducts in-depth theoretical analysis and Simulation Research on inverter dead time compensation,off-line parameter identification,on-line flux observation and rotor resistance correction,double closed-loop auto disturbance rejection control,weak magnetic control and so on.The theory is verified by the experiment of Infineon xmc4500 series hardware platform on the correctness and superiority of the theory.In this paper,on the premise of inverter dead time compensation,the recursive least square method is used to identify the off-line parameters of asynchronous motor,including the resistance and inductance of stator and rotor.The identification can be completed quickly when the motor is stationary,and the results are more accurate.At the same time,the extended state observer is used to observe the flux linkage,and the perturbed parameters are compensated by the extended state,and the rotor resistance is corrected on-line by the compensation amount,which has achieved good results.In view of the current situation that the encoder of asynchronous motor is mostly low resolution,the speed observation using extended state observer weakens the serious jump and lag effect introduced by simple difference algorithm,and the effect is obvious at low speed.In addition,this paper proposes a double closed-loop control system based on ADRC,which has strong anti-interference ability and almost no overshoot.Finally,this paper uses the voltage feedback method to design the field weakening part,completes the field weakening process when the rated speed is exceeded,and finally realizes the design of high-performance asynchronous motor drive control system.