基于自适应解调鲁棒观测器的漏磁可控式永磁电机无位置传感器控制研究

The adjustable leakage flux permanent magnet (ALF-PM) motor possesses the characteristics of wide speed range at light load and high output torque at heavy load, which meets the requirements of multiple-operating conditions of electric tractors. However, due to the electromagnetic parameter mismatch of the ALF-PM motor under multiple-operating conditions, its rotor position estimated performance of sensorless control is greatly influenced. To solve this problem, a novel sensorless control strategy based on adaptive demodulation robust observer is proposed in this paper. First, a high-frequency current demodulation algorithm based on an adaptive position error demodulator is developed to directly demodulate the q-axis current. Also, the bandwidth of the demodulator is dynamically adjusted through internal parameter adaptation. Thus, the high-quality demodulated signal under multiple-operating conditions could be ensured. Subsequently, an adaptive extended state observer is used to observe the rotor position information. A bandwidth adaptive adjustment scheme is proposed to adjust the observer parameters online. In addition, a robust controller is designed to improve the dynamic response performance of the estimated load torque and reduce the impact of parameter mismatch under multiple-operating conditions. Hence, the robustness of the position observer can be improved. Finally, the feasibility and effectiveness of the proposed sensorless drive control system can be verified by experiments.