To control stepping motors, the balance bridge power drive circuit is made up by TDA1521 integrated audio power amplifier, the pulse allotter is made up by the parallel ports of computer and latches.
双回转机构的步进电机控制电路由TDA1521音频集成功率放大器组成平衡桥式功率驱动电路，由计算机并行口经过锁存器构成脉冲分配器。
Stepper motors are used widely in numeral control system with the characteristics of high speed starting and stopping, accurate stepping, directly receiving numeral quantity.
步进电机因其快速启停、精确步进、直接接受数字量等优点，在数控系统中得到广泛应用。
As the implementation of the components, stepping motors are the key mechanical and electrical integration, one of the products are widely used in a variety of automatic control systems.
步进电机作为执行机构，是机电一体化的关键产品之一，广泛地应用在各种计算机控制的自动系统中。
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