Optimization of MTPA Algorithm of Permanent Magnet Synchronous Motor for Electric Tractor

When a permanent-magnet synchronous motor is driven by an electric tractor, potholes, sudden changes in speed and motor temperature rise may occur during transportation and plow operations. These factors may cause the motor operation and control parameters to change. The traditional maximum torque per ampere (MTPA) trajectory is based on the control parameters of the motor and the trajectory cannot be changed as the motor parameters change. However, the actual operation of the drive motor MTPA trajectory will change, which led to control deviation. This paper presents a torque current ratio limit tracking method, the torque in real time to consume the minimum current vector, MTPA trajectory closer to the actual operation of the motor drive MTPA curve, to obtain better maximum torque current ratio trajectory, the motor has More anti-interference. Through Simulink simulation and experimental verification, the improved MTPA algorithm can make the motor run more stable and can adapt to the harsh working environment of the driving motor.