Haixia Yuan
Mining belt conveyor, permanent magnet synchronous machine, extended Kalman filter (EKF), Sensorless, no load
Aiming at the inefficiency, high energy consumption and noise-prone permanent magnet synchronous motors (PMSMs) in the direct-drive control system of mining belt conveyors, this study proposes a sensorless control method using an improved extended Kalman filter (EKF). By introducing multi-new information optimisation method (IOM) to improve the IOM-EKF algorithm. The experimental results show that the research algorithm has better position estimation ability in all stages of no-load startup; the research algorithm remains more stable in the sudden change experiment, with a minimum of only -0.07 r/min, which is better than the comparison control algorithm. In addition, the system under the algorithm reaches the set speed in a very short time when the load changes suddenly after the motor starts with no load, the maximum speed reaches 96 r/min, and it enters the stable state at 0.04 s, and there is an overshooting amount of 4.4% in 0.4 s when the sudden change occurs, and the oscillation amount of the rotational speed waveform is very small and it enters the stable state quickly. In practice, the efficiency of the motor can reach up to 97% at 35 Hz, and the power factor can reach 0.978. Although there will be some overshooting and fluctuations at the initial stage, it still has a very good response ability. Taken together, the control system under the improved control algorithm proposed in the study has strong robustness and reliability and can be effectively applied in real permanent magnet synchronous machines.
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