Study On Sensorless Dual-axis Synchronous Control Of Permanent Magnet Synchronous Motor

The electric drive system takes the electric motor as the core and has become the main body of the intelligent manufacturing industry.Under the background of the "14th Five-Year Plan",its subsequent development has been given the important significance of green,low carbon,energy saving and high efficiency.Permanent Magnet Synchronous Motor(PMSM)vector control system is widely used in various fields due to its high efficiency and high precision.In order to improve its environmental adaptability and reliability,overcome the limitations of traditional mechanical sensors,realize low-cost control,the system without position sensors came into being.In addition,in a multi-motor drive system,the motor synchronization performance directly affects production efficiency,processing quality,and equipment life.Therefore,it is of great value to further expand the application of sensorless drive technology in multi-axis synchronization systems.After studying the sensorless control system,the integral non-singular fast terminal sliding mode observer is proposed to observe the back Electric Motive Force(EMF)of the motor,and the method of phase-locked loop(PLL)and cascaded low-pass filter is used to estimate and compensate the actual speed and rotor position of the motor.Then the I/F starting strategy is adopted to realize a complete PMSM sensorless control system.The simulation results show that the proposed method can achieve higher precision than the traditional method,effectively avoid the noise problem caused by differential,and the system can run smoothly under various working conditions.Aiming at the problem that the traditional position control method cannot achieve complete speed control and is prone to impact,while the S-shaped speed planning method has limited position control accuracy,a position-speed integrated position control strategy that introduces forward-looking position deviation is proposed.The research result shows that this method while achieving high-precision position control,the speed is controllable,which effectively reduces the impact on the system.In order to reduce the sensitivity of system to the changes of motor parameters in actual operation,the model reference adaptive method is used to identify the stator resistance and inductance of PMSM on-line.And the cross-coupling control method was introduced to extend the sensorless control system to the field of dual-axis synchronous control,and a sensorless dual-axis synchronous control system was established.The feasibility of the system is verified,and the results show that the sensorless dual-axis synchronous control system has a certain control accuracy,avoids the limitation of traditional mechanical sensors,and can effectively reduce the position synchronization error between the two axes in synchronization control.