ABSTRACT The traditional open‐loop control method of stepper motors has problems such as weak high‐speed load capacity and high motor temperature rise, which limit their further application in high‐speed scenarios. A closed‐loop heavy‐duty drive method based on a position hybrid controller and a variable coefficient proportional‐integral (PI) is proposed. To improve the load capacity of the motor at high speed, the position hybrid controller adopts angle advance compensation and current time‐sharing control methods to adjust the amplitude and angle of the current vector. In order to reduce the temperature rise of the motor under no‐load and heavy‐duty loads, the variable coefficient PI controller adjusts the output current of the motor by adaptively adjusting the current loop control parameters based on the actual operating speed. Compared with the traditional open‐loop control method, the experimental results show that the closed‐loop heavy‐duty drive system using the method proposed in this paper has a higher maximum no‐load operating speed and a higher load capacity at the same operating speed. Moreover, under the same operating speed and load, the motor has a lower output current, which reduces the motor's losses and temperature rise.
Lu et al. (Thu,) studied this question.