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Initial rotor position estimation method of sensorless PM synchronous motor with no sensitivity to armature resistance

机译:对电枢电阻不敏感的无传感器永磁同步电动机初始转子位置估计方法

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摘要

This paper proposes a new initial rotor position estimation method of a sensorless permanent magnet (PM) synchronous motor at starting condition, which has no sensitivity to the armature resistance. The method is based on saliency of the rotor and employs the alternating magnetic field which is excited by a current controller. The phase differences between the magnetizing current references and the voltage references make it possible to estimate the rotor direction accurately without motor parameters, except the ratio of direct axis and quadrature axis inductance. Also, the magnetic pole is evidently identified by detecting the voltage reference oscillation phenomena caused by magnetic saturation, which can be performed without motor parameters. The experimental result has proven that the estimation error was within -4.5 to +2.5 mechanical degrees, even though the armature resistance varied to 125% of the nominal value.
机译:提出了一种新型的无传感器永磁同步电动机在启动状态下的初始转子位置估计方法,该方法对电枢电阻不敏感。该方法基于转子的凸度,并采用由电流控制器激励的交变磁场。励磁电流参考值和电压参考值之间的相位差使得可以在没有电动机参数的情况下准确估算转子方向,除了直轴和正交轴电感之比。同样,通过检测由磁饱和引起的参考电压振荡现象可以明显地识别出磁极,这可以在没有电动机参数的情况下执行。实验结果证明,即使电枢电阻变化至标称值的125%,估计误差也在-4.5到+2.5机械度之间。

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