一、引言在目前兴起的数字化液压元件中,已开始大量使用步进电机驱动式。这是由于步进电机具有D/A转换功能、定位精度高、重复性好、抗干扰能力强等特点。尤其当系统中使用微机控制时,可以减少一个D/A转换器。二、步进电机步进电机的工作特点是逐步运行,其运行频率比同一等级的直流电机要低得多。一般地说,液压元件对快速性都有较高的要求,因此,提高步进电机的最高运行频率对数字化液压元件的发展具有重要的现实意义。目前,国 I. Introduction In the emerging digital hydraulic components, has begun to extensive use of stepper motor drive. This is because the stepper motor with D / A conversion, high positioning accuracy, repeatability, anti-interference ability and so on. Especially when the system uses microcomputer control, you can reduce a D / A converter. Second, the stepper motor stepper motor work is characterized by gradual operation, its operating frequency is much lower than the same level of DC motor. Generally speaking, the hydraulic components have high requirements on the rapidity. Therefore, improving the maximum operating frequency of the stepper motor is of great practical significance for the development of digital hydraulic components. At present, the country