改进的车载空调压缩机无位置传感器控制起动方法

无位置传感器控制是空调压缩机控制系统的较优选择。针对基于滑模观测器(SMO)的永磁同步电机(PMSM)无位置传感器控制系统零速观测精度低、起动难度大等问题,提出了一种改进PMSM无位置传感器的零速低速起动及中高速域使用的SMO控制的切换方法。在电机低速和零速时,I/F控制使其工作在角度开环电流闭环的工况下,该算法的给定相位与观测相位误差达不到系统切换要求,需利用降低开环电路的方式来降低误差；在电机转速提高的同时补偿SMO的角度,使观测角度接近真实角度,2种算法切换时稳定性更高,抗干扰能力更强。根据MATLAB/Simulink仿真结果和实际3.5 kW车载空调PMSM调试,验证了该方法的可行性和改进算法的有效性。

Improved Position Sensorless Starting Method for VehicleMountedAir Conditioning Compressor

Position sensorless control was the preferred choice for air conditioning compressor control systems. Aiming at the problems of poor zero speed observation accuracy and high starting difficulty of the position sensorless control system of permanent magnet synchronous motor (PMSM) based on sliding mode observer (SMO), an improved PMSM position sensorless control strategy was proposed, which could switch from the zero speed and low speed starting to SMO control under medium and high speed. At the low speed and zero speed stage, I/F control was used to keep the motor work in the angle openloop and current closedloop condition. When the angle error was too large to reach the system switching requirement, the phase difference of the real angle was reduced by reducing the openloop current. The angle of the SMO was compensated when the motor speed was increased, so that the observation angle was as close as possible to the real angle. In this way, the switching between the two algorithms became more stable, and the antiinterference ability was stronger. Through the MATLAB/Simulink simulation and the actual 3.5 kW vehiclemounted air conditioner motor debugging, the feasibility and effectiveness of the method were verified.