Abstract
Two problems can cause control performance degradation on permanent magnet synchronous motor (PMSM) systems, namely, fluctuation of PMSM parameters and the time delay between current sampling and command value update. In order to reduce the influence of these problems, a new current-predictive control strategy is proposed in this article for medium- and high-speed PMSM. This strategy is based on the discrete mathematical model of PMSM. This new control strategy consists of two main steps: First, an integrator is applied to calculate current compensation value; second, the predictive current value is obtained through deadbeat-current predictive method. The stability of predictive control system is also proved in the article. With this deadbeat-current predictive control scheme, the real current can reach the desired value within one control-step. Based on this new current control method, Luenberger observer and phase-locked loop position tracker is applied in this article. Experimental results for 0.4 kW surface-mounted PMSM confirm the validity and excellent performance for parameters fluctuation of new current predictive control.
Highlights
Nowadays, permanent magnet synchronous motors (PMSMs) have been widely used in industrial applications due to their high power and torque density, small size and wide-speed-range
The experimental drive setup consists of a 0.4 kW PMSM connected to a dynamometer machine and a load motor used for loading
Both of load motor and tested motor are supplied by a inverter which is connected with a common direct current (DC) link and controlled by Infineon TC1782, the sampling-time and PWM frequency is fs =
Summary
Permanent magnet synchronous motors (PMSMs) have been widely used in industrial applications due to their high power and torque density, small size and wide-speed-range. Compared with aforementioned sensorless control methods, the method in this paper can decrease signal phase-lag and few fluctuations on model parameters will not produce the large position error, because a current compensation method is proposed to reduce current ripple. Key PWM time-sequence logic relationship between current sampling and voltage command update is established Based on this relationship, a deadbeat-current predictive method is proposed to calculate real-time voltage command value.
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