Abstract
Based on current research into the mathematical model of the permanent magnet synchronous motor (PMSM) and the feedback linearization theory, a control strategy established upon feedback linearization is proposed. The Lie differential operation is performed on the output variable to obtain the state feedback of the nonlinear system, and the dynamic characteristics of the original system are transformed into linear dynamic characteristics. A current controller based on the input–output feedback linearization algorithm is designed to realize the input–output linearization control of the PMSM. The current controller decouples the d–q axis current from the flux linkage information of the motor and outputs a control voltage. When the motor speed reaches above the base speed, the field-forward and straight-axis current components are newly distributed to achieve field weakening control, which can realize the smooth transition between the constant torque region and weak magnetic region. Simulation and experimental results show the feasibility and viability of the strategy.
Highlights
Permanent magnet synchronous motor (PMSM) have been widely used in a variety of industrial applications due to their high power density, high efficiency, high reliability and wide constant power operating range [1]
This paper investigates the PMSM, and from the analysis of its topology and principles, a control strategy based on feedback linearization is proposed
This weakening control strategy based on feedback linearization
Summary
Permanent magnet synchronous motor (PMSM) have been widely used in a variety of industrial applications due to their high power density, high efficiency, high reliability and wide constant power operating range [1]. When the PMSM is running in the field weakening control zone, once the given torque is suddenly changed, the output voltage of the current controller is easy to saturate. The control method can adjust the weak magnetic running direction in real time, realize nonlinear control of the weak magnetic region, high control precision and fast response speed [15,16,17] This algorithm is extremely complicated and has a large dependence on motor parameters. Professor Xu Longya of the Ohio State University proposed a single-current flux weakening control algorithm for various problems in the above flux weakening control method In this control strategy, the d-axis reference voltage is still given by the d-axis current regulator output.
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