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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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