The Design of New Sensorless BLDCM Control System for Electric Vehicle

In order to meet the requirement of reliably running which is by Electric Vehicle for motor controller, the paper is focused on a sensorless brushless DC motor controller design and a commutation point method. By utilizing the saturation effect of stator iron core, six short voltage pulses are employed to estimate the initial rotor position. After that a series of voltage pulses are used to accelerate the motor. When the motor reaches a certain speed at which the back-electromotive force (EMF) method can be applied, the running state of the motor is smoothly switched at the moment determined by the relationship between the terminal voltage waveform and the commutation phases. “Lagging 90?-α commutation” is bring forward to overcome the shortages existing in the traditional method. The experimental results verify the feasibility and validity of the proposed method.

基于转子位置自检测复合方法的永磁同步电机无传感器运行研究

基于对高频信号注入法和模型参考自适应法转子位置自检测原理和特性的讨论,提出了一种包含零速在内的全速度范围内均能实现转子位置/速度准确检测和控制的复合方法。分析了从旋转高频电压信号注入法过渡到模型参考自适应法的切换原则,给出了速度切换区内转子位置、速度和加权系数的估算方法,并对1台内插式永磁同步电机2种方法的切换过程进行了实验研究,成功地实现了无传感器矢量控制的起动与运行。实验研究表明,这种转子空间位置复合检测方法既能在低速时准确地观测出转子的空间位置和速度。也能保证高速运行时较快的动态响应,适合于全速范围内电机的无传感器运行。