Abstract
In this study, a velocity control method is proposed for minimizing velocity ripples in permanent-magnet synchronous motors with low-performance current sensing. The proposed method involves the use of desired currents, peak estimation, and a proposed tracking controller. The desired currents are used to achieve velocity control with only the current sensing. Peak estimation is performed to estimate the peak of the measured distorted current that occurs due to low-performance sensing. The proposed tracking controller is developed based on a proportional-integral controller using the estimated peak obtained from the measured currents. The proposed method aids in reducing velocity ripples and improving velocity tracking performance of permanent-magnet synchronous motors. The primary contribution of this method is the improvement of velocity-control performance with low-performance current sensing. The stability of the closed loop is proven by employing the input-to-state stable property. To verify the effectiveness of the proposed method, we performed simulations and experiments with different three cases.
Highlights
Nowadays, permanent-magnet synchronous motors (PMSMs), such as electric vehicles, wind generation systems, industrial robots, air conditioners, and washing machines, are widely used in household and industrial applications owing to their high efficiency, low maintenance cost, and high power density [1]–[4]
Motivated by the aforementioned concerns, this study proposes a velocity control method to reduce the velocity ripples for PMSMs with a low-performance current sensing
PMSM modeling is first introduced in α-β coordinates, and the desired currents are subsequently derived for velocity control
Summary
Permanent-magnet synchronous motors (PMSMs), such as electric vehicles, wind generation systems, industrial robots, air conditioners, and washing machines, are widely used in household and industrial applications owing to their high efficiency, low maintenance cost, and high power density [1]–[4]. Velocity control methods using direct torque control was designed for optimal dynamic performance [14] These methods improve the velocity control performance of PMSMs, accurate information of the state variables (position, velocity, and currents) is required for their implementation. To overcome these problems, sensorless control methods have been researched [15]–[17]. Motivated by the aforementioned concerns, this study proposes a velocity control method to reduce the velocity ripples for PMSMs with a low-performance current sensing This method is based on the desired currents, peak estimation, and current tracking controller. The velocity-control performance achieved using the proposed method is validated using simulations and experiments
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