Abstract
The demand for the high-performance and low-cost position control actuators in many applications promotes the development of three-phase hybrid stepper motors. The torque ripple, loss, and pullout torque of the motor are the key factors to be considered in the motor application. In order to solve the problems of the open-loop control mode, this paper proposes a new “sensorless closed-loop” control mode to significantly improve the performance of three-phase hybrid stepper motors. This control mode is developed by estimating the rotor position with the Extended Kalman filter observer, thereby realizing the closed-loop control of the motor with sensorless technology. This paper illustrates the effects of this control mode by analyzing motor noise, losses, and pullout-torque. The results show that the use of the “sensorless closed-loop” control mode presented can effectively improve the performance of the stepper motor while maintaining the advantages of the motor in terms of cost and size. These results have positive significance for the development, application, and promotion of high-performance three-phase hybrid stepper motor systems.
Highlights
Hybrid stepper motors (HSMs) are used in a wide range of applications due to their advantages in performance and cost
The study on the drive mode of this kind of motor is essentially based on the open-loop control mode. Since this control mode cannot significantly improve the performance of stepper motor, this paper presented a “position sensorless closed-loop” control mode to greatly improve the performance of 3P-HSM in steady-state operation
The results show that the “EKF position observer” has high accuracy and is suitable for the closed-loop control of 3P-HSM
Summary
Hybrid stepper motors (HSMs) are used in a wide range of applications due to their advantages in performance and cost. With the increase of motor speed, the “Pullout-Torque” of the motor will drop, and the motor speed is limited To solve these problems, some researchers have proposed the subdivision control modes to subdivide the drive current; the motor performance can be improved in terms of stability, vibration, and noise [2]. The Field Oriented Control (FOC) mode is a highly regarded control technique for permanent magnet synchronous motor (PMSM) applications today [3,4] This control mode can effectively reduce the drive current and running noise of the motor. 3P-HSM: the “position sensorless closed-loop” control mode This control mode significantly reduces the copper consumption of the motor, increases the pullout torque of the motor, and reduces the noise of the motor. Test results confirm the effectiveness of this control method
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