The driver sampling similar to the servo control principle, unique circuit design, superior software algorithm processing, so that the motor can run smoothly even under low subdivision, almost no vibration and noise, smooth and accurate current control technology greatly reduces the motor heat, external 16 speed equal Angle constant torque subdivision, up to 128 subdivision, optocoupling-isolated differential signal input, Strong anti-interference ability, with over-voltage, under-voltage, over-current protection and other error protection functions. Small size, in the medical, testing and other equipment applications, its stability, vibration, noise performance advantages are obvious, can greatly improve the performance of equipment.