經實驗過後，開迴路效率只能到達約30%，加入控制器的不僅能夠修正到設定的角度，更能減少消耗的功率，讓馬達的效率提升至約93%。 ;Open-loop stepping motors are driven in several modes, e.g., full-step or half-step. The cogging torque results in ineffective micro-stepping, affecting the angle of the stepping motor, furthermore, open-loop stepping motors skip steps. Generally, even though providing the maximum current and torque to drive the stepping motor, power efficiency is low due to energy loss on the winding coil.
The purpose of the study is to design a micro-servo-stepping motor combined with servo and a current controller. Adjusting the excitation angle with I control to correct the error caused by cogging torque and controlling the excitation current with PI control to drive the load with an appropriate current provide the better power efficiency. In this way, it can make appropriate adjustments to achieve power conservation.
After the experiment, open-loop efficiency just achieves 30%, but controllers not only meet the standard of setting angle but also reduce power consumption and improve efficiency of the motor to about 93%.