Stepper motors are receiving wide attention in industrial applications which require high performance. The main merit of stepping motors over other motor types is the possibility of digital and open loop control. Stepper mo-tors with open loop control are very well suited to many fields of applications, but they show a poor per-formance. So a closed loop control is used to increase the speed, acceleration, accurate positioning in order to produce fast response times, higher resolution capabilities and more reliability of stepping systems. This paper introduces the stepping motor instantaneous equations that describe motor characteristics and performance under applying Field Orientation Control technique (FOC). The simulation and experimental results are present-ed to demonstrate changing the value of turn on and turn off angles of stepper motor upon its performance.