Research on a Position-Sensorless IPM Motor Drive System Using Position Estimation Based on Magnetic Saliency

本研究的目的是建立一个无位置传感器的IPM电机驱动系统(3.7kW)，并研究其特性。首先，设计并搭建了一台3.7kW内置式永磁同步电机(IPM电机)的实验驱动系统。研制了谐波电流检测电路、脉宽调制信号发生器和与数字信号处理器(DSP)相连的接口电路。该电路的特点是结构复杂，可以自动采集电压型PWM逆变器产生的纹波电流来估计IPM电机的转子位置。采集系统在可编程逻辑器件(PLD)中实现。此外，理论和实验表明，在本课题组提出的脉宽调制方法中引入加权系数可以使逆变器的输出电压提高15%。另一方面，基于…利用MATLAB/SIMULINK进行了更多的仿真，研究了控制系统是否存在电流小环时，驱动系统的控制性能不同。结果表明，即使将d轴基准电压设为零，也不能将d轴电机电流调整为零，并且在控制系统中加入电流小环不仅提高了电流响应，而且提高了位置和速度控制系统的稳定性。此外，还利用MATLAB/SIMULINK开发了一种能够准确、高效地对驱动系统进行仿真的仿真方法。该仿真方法的特点是假设一个数字控制的PWM逆变器对应于采样时间可变的离散时间系统。五种情况下的仿真结果验证了该方法的正确性和有效性。这种仿真方法可以消除电流和电压误差，并且执行时间比传统方法快100倍左右。较少

This research aims to build up a position-sensorless IPM motor drive system (3.7 kW) applying a position estimation proposed by the head investigator, and to study characteristic of the drive system.First of all, we have design and build up an experimental drive using a 3.7-kW interior permanent magnet synchronous motor (IPM motor). A harmonic current detection circuit, a PWM signal generator, and an interface circuit connecting a digital signal processor (DSP) have been developed. The circuits are characterized by a sophisticated configuration which can automatically acquire ripple currents generated by a voltage-source PWM inverter to estimate the rotor position of the IPM motor. The acquisition system is implemented in programmable logic devices (PLDs). Moreover, it is shown theoretically and experimentally that introduction of weighting coefficient into the PWM method proposed by the head investigator can enlarge the output voltage of the inverter by 15%.On the other hand, based on … More simulations using MATLAB/Simulink, it has been investigated that the control performance of the drive system is different whether the control system has current minor loops or not. As a result, it is shown that the d-axis motor current can not be adjusted to zero even if the d-axis voltage reference is set to zero, and that addition of the current minor loops to the control system improves not only current response but also stability of the position and speed control systems. In addition, a simulation method, which can simulate the drive system accurately and efficiently, is developed using the MATLAB/Simulink. The simulation method is characterized by assumption that a digital-controlled PWM inverter corresponds to discrete time systems with variable sampling time. Simulations in five conditions have confirmed validity and effectiveness of the method. The simulation method makes it possible to eliminate current and voltage errors, and execution time in the method is about 100 times faster than that of the conventional method. Less