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中文摘要：
L297＋L298结构广泛应用于步进电动机驱动。以一个两相步进电动机为例，从电机分析人手，设计了基本驱动、斩波恒流驱动和细分驱动三种驱动电路。针对定时器转速间关系、细分量计算、软件设计及电机不能正常运转等问题进行了详细分析，为更好地使用L297＋L298芯片进行步进电动机驱动提供参考。
英文摘要：
L297＋L298 structure are widely used in stepper motor drives. Taking a two-phase stepper motor for exampie, this paper designed three drive circuits including basic drive circuit, chopper constant current drive circuit and divided drive circuit. The issues of relationship between speed and timer, calculation of divide value and reason of motor running abnormally were analyzed in detail,providing reference to use L297＋L298 in stepper motor drive better.
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