MPL-B4540F-SK74AA

MPL-B4540F-SK74AA

工作状态包括电机的电源电压、电机的转速、负载转矩等因素，这些因素将影响电机的电磁力、电流和电阻等参数，从而影响电机的扭矩大小。同时，电机的扭矩也与电机的类型、大小、材料等因素有关。不同类型的电机有不同的扭矩特性，如直流电机具有良好的转矩控制性能，而异步电机则具有较大的启动转矩。

　　（1）与电压的平方成正比。根据的转动原理，电磁转矩与每极磁通和转子感应电流成正比，而每极磁通和转子电流又都与电压成正比。所以转矩便与电源电压的平方成正比。因此，电源电压的下降对电动机的起动性能影响大例如，电源电压降为原来的80%，起动转矩就只有原来的（80%）2，即原起动转矩的64%，所以在低电压下，电动机的起动特别困难。

　　（2）与电动机的漏电抗有关。漏电抗（由漏磁通产生）大，起动转矩小；反之，减小漏电抗可增大起动转矩。而漏电抗又与绕组匝数和气隙大小有关。因此修理电动机时，注意保持原设计的绕组匝数和气隙是很重要的。

　　（3）起动转矩随转子电阻的增大而增大。如绕线式异步电动机起动时，在转子绕组回路中串入适当的附加电阻可以增大起动转矩因素有关。

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