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The motor has become an important and inseparable part of the electromechanical control in the field of mechanical control，therefore making the motor run and stop precisely has becomes a major research direction. Nowdays,most motor positioning algorithms are based on the optocouplers to complete.However,this article puts forward a new algorithm for motor positioning based on optocouplers and hysteresis comparator which starts from another point of view. Without changing the effect of motor positioning，the number of optocouplers can be reduced.