在开环数控系统中采用数据采样法插补，可以有效提高系统性能。

Though time-slicing interpolation used in Open-loop CNC can prompt system performance effectively.

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本论文所论述的系统采用MSP430F149单片机通过不对称规则采样法来输出高精度的三相spwm波形，从而实现了逆变器的SPWM控制。

The system adopts MSP430F149 MCU and asymmetry regular-sampling strategy to output high precision SPWM wave, consequently transducer's SPWM control is realized.

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