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1前言无级调速装置的关键所在是对步进电机的控制，目前广泛使用的是T680型和14Q。到步进电机驱动器。通过对使用和检修情况的调查，发现它们存在以下不足。（豆）工作频率精度不高。由于采用调节电位器改变输出频率，全凭经验调节，不可能达到整定值。（2）脉冲信号由环行分配
1 Preface Stepless speed control device is the key to the stepper motor control, is currently widely used T680 and 14Q. To stepper motor driver. Through the use and maintenance of the survey found that they have the following deficiencies. (Beans) work frequency accuracy is not high. As a result of the adjustment potentiometer to change the output frequency, based entirely on the experience of regulation, it is impossible to reach the setting value. (2) The pulse signal is distributed by the loop