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6ES7355-1VH10-0AE0
首先考虑定子。定子端子两端每相施加的电压等于每相定子感应电压加上定子绕组电阻两端的压降,加上由于泄漏磁通(仅连接定子绕组)引起的定子漏电抗两端的压降之和。在数学上,以相量形式,关系可以表示为:
V1= E1( 11我1+ jX1我1= E1+ 我1(R1+ jX1) (4)
哪里
V1= 每相定子端电压
E1= 定子每相感应电压
我1= 每相定子电流
R1= 定子绕组电阻
X1= 定子绕组电抗
磁芯可以建模为电阻R的并联组合c考虑迟滞和涡流损耗以及电抗Xm考虑产生气隙磁通量所需的磁化电流。由于电机中存在气隙,感应电机中的磁化电流比变压器中的磁化电流大得多。
接下来,开发转子模型。让 E2表示静止时的转子感应电压,即 s= 1.0。在静止时,感应电动机可被视为具有气隙的变压器,并且定子每相感应电压E1与转子每相感应电压E有关2通过匝数比(N1/N2),即:
[E_{1}={Big(}frac{N_{1}}{N_{2}}{Big)}E_{2},,,(5)]
哪里
N1= 定子绕组的匝数
N2= 转子绕组中的匝数
感应电动机转子中的感应电压与转子的相对运动和同步旋转的气隙磁场成正比。当感应电动机以速度n或滑差s旋转时,转子感应电压E2秒等于静止时的感应电压 E2乘以纸条。在短路转子电路中,感应电压E2秒表现为转子电阻和漏电抗两端的压降。
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