变频器的控制电路采用数字技术，容易升级、适用范围广。
Its control circuit adopts digit technology, so it is easily promoted, its applicable bound is wide.
通过与传统电机驱动及变频器控制方式相比较，介绍了伺服技术及其在枕式包装机中的应用，指出伺服驱动式枕式包装机在现代食品工业中应用的优势。
This letter introduced application of servo technology for horizontal pillow packaging machine and it's for modern food industry comparing with the conventional motor control and transducer control.
级联型多电平变频器控制策略除了采用载波相移PWM技术外，阶梯波算法也是一种比较好的控制策略。
The carrier shifted-phase PWM technique can been used in cascade multilevel inverter, in addition, the step waveform strategy is good strategy, too.
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