MPL-B540D-MJ72AA

MPL-B540D-MJ72AA

可以理解为，起动时转子感生电流的磁场与定子磁场的夹角太小。只有达到90°时力矩大，但整个过程都不可达到90°，只是逐步向90°靠近。

如果不改变转子线圈材料和线槽尺寸，只是改变匝数和线经，那理论上不能改变线圈的电阻与电抗比。比如把1匝扩为10匝，则电阻电抗都扩大到100倍，感生电压扩大到10倍。

但如果把单匝改多匝，再将线头引出，串联上的电阻，就可以改变阻抗比，使起动电流比鼠笼式低，而起动力矩比鼠笼式大。并且调节这个串联电阻时，可以改变电机的起动和运行性能，这就是绕线转子异步电机的原理。这种电机多用于难起动机械部位。

由于半导体技术的进步，整流和交流逆变技术成熟了。现在变频器的出现，能任意调节起动频率，使得鼠笼式电动也可以代替绕线式了。

绕线型异步电动机的优点是结构简单、可靠性高、制造成本低。它们广泛应用于家用电器、工业设备以及交通运输等领域。

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