步进电机恒流驱动电路设计

Design of Constant Current Driver Circuit of Stepper Motor

摘要:

针对步进电机在恒压驱动控制中,高频条件下容易出现电机失步,造成无法正常运转的情况,设计了基于LMD18200的电流滞环驱动电路。通过对步进电机功率放大器电路的常见形式进行研究,分析恒压与恒流驱动电路设计上的差异,理论上推导恒流驱动稳定电流及波动频率等特性。利用Matlab仿真对比恒流与恒压驱动电路相电流的上升速度,说明两种方式下平均输出力矩以及运行频率情况。以电机驱动集成芯片LMD18200实现两种驱动方式的硬件电路,分别对型号TS3641N1E2的负载电机进行测试。在不同的运行频率下,根据两种驱动电路的相电流以及运行状态,验证步进电机恒流驱动电路设计满足空间光学遥感器机构控制的要求。

Abstract:

In the constant voltage driver for stepper motor control, the motor cannot rotate properly under the high-frequency environment, so current hysteresis control circuit is designed based on LMD18200. This paper describes the common forms of the stepper motor power amplifier circuit firstly, and analyzes the difference between constant voltage and constant current driver circuit, and deduces the characteristics of steady current and fluctuation frequency theoretically. Comparing the rising slope of phase current between constant current driver circuit and constant voltage driver circuit through Matlab simulation, the average output torque and operating frequency are explained. Two kinds of drive hardware circuit are achieved with motor driver integrated chip LMD18200, and tested separately under the condition of using the same motor type TS3641N1E2. At different operating frequency, according to the phase current and operating state of the two driving circuits, the design of constant current driver circuit is verified to meet the requirements for the control of space remote sensing mechanism.