AB产品供应MVI69-PDPS

MVI69-PDPS

a、通常Ld

b、原点到椭圆上一点的向量不是电压相量除以角速度，两者相差90°；

c、椭圆圆心在直轴的负半轴；永磁磁链与直轴电感的比值ψ0/Ld越大，圆心距离原点越远；实际上，由短路时的电压方程可知，ψ0/Ld即是短路电流Ik；

d、当U时，ω越小，椭圆越大；可以通过算法改变U使椭圆经过原点，这时Id、Iq均为零，即变频器输出电流为零；当U有大值时，ω也有一个可以使椭圆经过原点的大值；超过这个角速度，即使空载，也需要的去磁电流；若施加的直轴电流为-Ik，理论上电机的转速可以到无穷大。

4、变频器的大电压和大电流

受直流母线电压限制，变频器有大输出电压Umax；受器件容量限制，变频器有大输出电流Imax。这里默认电机更皮实，能承受的大电压和大电流均大于变频器的。我们以Id、Iq建立坐标轴，因为Id^2+Iq^2小于等于Imax^2，故Id、Iq的取值范围是以Imax为半径的圆内。此外，Id、Iq还应该在电压/转速椭圆内；当然只要电机的转速足够低，这个椭圆就可以大。无论如何，受电流和电压的双重约束，Id、Iq的取值范围应该是大电流圆和电压/转速椭圆的交集部分

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