On the basis of the mathematics model of two-phase hybrid stepper motor, aiming at solving the problem of loud noise and large vibration in the low-speed operation, the paper studies the technology of sine pulse width modulation subdivided driving and a multi-micro stepping driver based on the one-chip computer controlling was designed. The driver consists of digital control part, GAL logic integrated unit, SG3525 constant current control circuit, driving circuit, over current protecting and feedback circuit, and the power supply block. The driving system using special integrated chip and programmable logic device takes 8-bit single chip AT89C2051 as the control core and has the functions of constant current control, forward/reverse working, over-current protection and multilevel subdivided driving. Experiments indicate that the design of hardware and software is reasonable and feasible, and successfully meets the design needs.%在二相混合式步进电机数学模型的基础上,针对电机低速运行时的振动和噪声过大的问题,研究了正弦脉宽调制细分驱动技术,开发出一种新型的基于单片机的多细分二相混合式步进电机驱动器.该系统主要分为数字控制部分、GAL片逻辑综合信号处理单元、SG3525恒流控制电路、驱动功放电路、过流保护及反馈电路和系统供电电源模块等.系统采用专用集成芯片和可编程逻辑器件,以8位单片机AT89C2051为控制核心.实现恒流控制、正/反转运行、过流保护和多档位细分等功能.实验结果表明,系统硬件和软件设计合理可行,各项技术指标均达到了设计要求.
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