A practical solution of brushless DC motor （BLDCM） driving circuit is proposed. The special Integrated chip Si9979Cs by Vishay Siliconix is used to control the whole system. High-speed optocoupler HCPL-2630 is adopted as signal isolation to reduce the influence of system noise and increase stability. The three-phase signals of BLDCM Halls are input into Si9979Cs by pull-up resistor in order to control the three-phase bridge circuit composited by Si9936DY 3-phase full-bridge drive is adopted. Experiments show that the circuit is stable and reliable in application and can properly drive the Maxon 283867 high-speed BLDCM.%设计了一种实用的无刷直流电动机驱动电路。采用Vishay Siliconix公司的Si9979Cs无刷直流电动机控制芯片进行设计。为抑制系统噪声，提高控制系统稳定性，使用高速光耦HCPL-2630对控制信号进行隔离。电机三相霍尔信号通过上拉电阻直接送入Si9979Cs的逻辑电路，控制由Si9936DY组成的三相桥式电路换相，采用三相全桥驱动。实验表明．该电路在实际运行中稳定可靠，能正常驱动Maxon283867型高速无刷直流电动机。
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