S-SERVO adopted closed loop stepping motor system which perfectly resolves the problems of current open loop control stepping motor system such as Step Out and Positioning Completion Check. Regardless of motor type (2 Phase, 5 Phase), position precision only related to encoder so High Precision Positioning is always possible. Existing step driver resolution can be heated easily because of Constant Current goes into the motor regardless of loads magnitude. But S-SERVO enables to reduce high temperature of the motor and save energy usage.