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A20B-2902-0070
当磁链幅值时,电压空间矢量的大小与供电电压频率成正比,其方向与磁链矢量正交,即磁链圆的切向方向。当磁链矢量在空间旋转一周时,电压矢量也连续地按磁链圆的切线方向运动2弧度,其轨迹也是圆形的。这样,电动机旋转磁场的轨迹问题就可转化为电压空间矢量的运动轨迹问题。
5.3)三相全桥电压型PWM逆变器的八个电压空间矢量图4-9 三相桥式逆变电路
电压源型PWM逆变器同一桥臂的上、下开关管驱动信号互补。三个桥臂各自独立,每个桥臂有两种开关状态,222=8,三相全桥电压型PWM逆变器总共可以输出8个电压空间矢量。
5.4 )正六边形空间旋转磁场
6个有效空间电压矢量,在一个输出基波电压周期内各自依次连续作用1/6周期,逆变器运行于这种状态时会得到一个
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正六边形的旋转磁场。六个有效电压矢量各自连续作用1/6T,显然不能得到一个圆形的旋转磁场。所以这种六拍阶梯波逆变器的性能较差。
A20B-2902-0070
A20B-2902-0070