施耐德控制器系统 TSXP574823AM

施耐德控制器系统 TSXP574823AM

梯形整流换向还不足以为提供平衡、的无刷直流电机控制。这主要是因为在一个三相无刷电机（带有一个正统波反电动势）中所产生的转矩由下列等式来定义： 转轴转矩=Kt [IRSin（o）+ISSin（o+120）+ITSin（o+240）]

其中：

o为转轴的电角度

Kt为电机的转矩常数

IR，IS和IT为相位电流

如果相位电流是正弦的：IR=I0Sino；IS=I0Sin（+120o）；IT=I0Sin（+240o） 将得到：转轴转矩=1.5I0*Kt（一个独立于转轴角度的常数） 正弦整流换向无刷电机控制器努力驱动三个电机绕组，其三路电流随着电机转动而平稳的进行正弦变化。选择这些电流的相关相位，这样它们将会产生平稳的转子电流空间矢量，方向是与转子正交的方向，并具有不变量。这就了与转向相关的转矩纹波和转向脉冲。 为了随着电机的旋转，生成电机电流的平稳的正弦波调制，就要求对于转子位置有一个有测量。霍尔器件仅提供了对于转子位置的粗略计算，还不足以达到目的要求。基于这个原因，就要求从编码器或相似器件发出角反馈。

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