MPL-B540K-M-X232 AB电机

MPL-B540K-M-X232

直流电施加于无刷电机的驱动电路，但交流电流过电机。为此，无刷电机有时也被称为交流同步电机。

如“2.2.1 无刷电机结构”中所述，无刷电机中的定子和转子位置与直流电机中的位置相反。因此，如图 2.10 所示，无刷电机的基本速度-转矩特性呈现出与有刷直流电机相同的倾斜特性，电机以与负载转矩相匹配的转速旋转。

如果速度减慢，则电机产生的扭矩增加，并且流过与扭矩成比例的电流。如果流过大电流，电机的永磁体磁力可能会降低(退磁)，绕组可能会过热而烧毁。此外，驱动电路上的输出元件和转换器能够处理大电流，这导致驱动电路体积大且价格昂贵。如果转速增加，电机产生的扭矩减少，驱动所需的负载扭矩减少，不适合使用。以更高的速度运行它会增加齿轮箱与电机结合发出的噪音，并且还会导致齿轮箱润滑不足，从而影响使用寿命。

由于上述原因，对于无刷电机，驱动电路限制了流过电机的大电流和大转速。因此，Oriental Motor 产品目录中印制的速度-扭矩特性类似于图 2.11。

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