Abstract
In this paper, a new method for reducing the ripples of torque and flux is proposed for the predictive torque control (PTC) of permanent magnet synchronous motors. The conventional PTC uses equations to analyze the relationship between the electrical torque and voltage with a fixed magnitude of reference voltage. Consequently, flux and torque ripples increase significantly at low-speed operation. This paper proposes an improved PTC algorithm using a simple duty-ratio regulator. The proposed method will minimize the torque error by calculating an appropriate torque minimization function to mitigate the induced torque and flux ripple at low speed operation. This torque minimization function is synthesized into the space vector pulse-width modulation block to reduce the torque ripple induced owing to the fixed time duration. The proposed scheme considerably reduces the torque and flux ripples and establishes a fast-dynamic response of the torque in the transient state. Simulation and experimental results show that the proposed method achieves a more efficient steady-state performance and a faster step response compared with the conventional PTC.
Highlights
Permanent magnet synchronous motors (PMSMs) have several advantages over other motors, such as higher power density, high-performance motion control, higher speed, and higher accuracy
The torque ripple is decreased from 0.771 Nm in the conventional predictive torque control (PTC) to 0.398 Nm in the proposed PTC, which is a reduction of approximately 56%
For the conventional method, the stator flux is controlled at the reference flux (λ∗s ) of 0.56 Wb with a flux ripple of approximately 0.01 Wb; in the case of the proposed method, the flux ripple is approximately 0.004 Wb with λs controlled at 0.56 Wb
Summary
Permanent magnet synchronous motors (PMSMs) have several advantages over other motors, such as higher power density, high-performance motion control, higher speed, and higher accuracy. They are widely used in many automation processes and robotics. Studies have been conducted on PMSM drives using various torque control methods [1]–[4]. In the last few decades, two control strategies for electrical drives have dominated high-performance industrial applications: field-oriented control (FOC) and direct torque control (DTC) [5], [6]. The DTC of PMSM drives has gained popularity in advanced motor drive applications because it offers a fast-instantaneous motor torque and stator-flux control with simple implementation.
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