AB模块1794-OC16

1794-OC16

从波形中可以想象得到，如果只是单纯的正弦波驱动，那么VM将是电源电压的，只能施加多87%的电压。不言而喻，在驱动电机时，尽可能地增加施加于电机的电压是的要求，而实际上，在正弦波驱动时，会使用一些尽可能提高施加电压的手法。

使正弦波驱动时的施加电压更大的手法 ①

该波形是将正弦波（虚线）下方圆弧的一半分别与其他两相上方相加 之后的波形（绿色箭头）。从波形图中可以看出，可以施加比只是单纯的正弦波时更大的VM。虽然施加电压波形变成了失真波形而不是正弦波，但实际施加于电机的电压是相间的电压之差，通过调整使差值电压波形变为正弦波，即可使相电流波形成为正弦波。因此，这样做不会损失正弦波驱动的优点——率和更平稳。

使正弦波驱动时的施加电压更大的手法 ②

这是一种在基波（虚线正弦波）上加上三次谐波的手法。正弦波变成了梯形波，从波形图可以看出，这种方法也可以施加更大的VM，相电流波形为正弦波。

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