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A novel method for estimating the initial rotor position of PM motors without the position sensor

机译:不带位置传感器的永磁电机初始转子位置估计的新方法

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摘要

Permanent magnet (PM) motors have been used widely in the industrial applications. However, a need of the position sensor is a drawback of their control system. The sensorless methods using the back-EMF (electromotive force) cannot detect the rotor position at a standstill; recently, a few methods proposed to detect the initial rotor position, but they have high estimation error which reduces starting torque of the motor. Therefore, in this paper, a novel method to detect the initial rotor position of the PM motors is proposed, first, by using a space vector model, response of the stator current space vector to the saturation of the stator core is analyzed; then a novel method based on the saturation effect is presented that estimates the initial rotor position and the maximum estimation error is less than 3.8°. Simulation results confirm this method is effective and precise, and variation of the motor parameters does not affect its precision.
机译:永磁(PM)电动机已在工业应用中广泛使用。但是,需要位置传感器是其控制系统的缺点。使用反电动势(电动势)的无传感器方法无法检测到静止状态下的转子位置。最近,提出了一些方法来检测转子的初始位置,但是它们具有较高的估计误差,从而降低了电动机的起动转矩。因此,本文提出了一种检测永磁电机初始转子位置的新方法,首先,通过空间矢量模型,分析了定子电流空间矢量对定子铁心饱和度的响应。然后提出了一种基于饱和效应的新方法,该方法可以估计初始转子位置,并且最大估计误差小于3.8°。仿真结果证实了该方法的有效性和精确性,并且电动机参数的变化不会影响其精度。

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