High Performance Speed Control For Permanent Magnet Synchronous Motor By Using Passivity-Based Control

So far, Alternating Current (AC) motor drive has become the main transmission form inmodern industrial production. With the higher and higher production requirements, AC servosystems become more and more complex and diversified, and higher performances wererequired for motor control system. To make a motor have higher accuracy, wider speed range,faster response speed and stronger disturbance rejection capability, some studies on motorbody and control strategy were performed. In recent years, the development of PermanentMagnet Synchronous Motor (PMSM) has been greatly promoted by the progress in thepermanent magnet material, power electronic technology and computer technology, etc.Compared to other AC motors, PMSM has many good characteristics, such as small size, highefficiency, great power density, easy maintenance and so on, so that it has advantages inenergy saving and environmental protection. The research on high-performance PMSMcontrol system, therefore, has important significance for modern industrial production andsustainable development.However, there are still some shortages in a PMSM, such as the nonlinearity, strongcoupling, etc. Also, a PMSM system would receive some uncertain disturbances during itsoperating. As a result, traditional control strategies are hard to satisfy the control requirementsof a PMSM servo system with high performances. Recently, the Passivity-Based Control(PBC), a controller design method based on stability theory, has received increasing attentionfrom scholars. Its main characteristic is that the energy storage function of a closed loopsystem is chosen as a Lyapunov function, which can make the stability analysis of the wholesystem simpler. In this paper, a high performance speed control system of PMSM is designedby using the method of Interconnection and Damping Assignment Passivity-Based Control(IDA-PBC). The main contents are shown as follows.In the first part, the back ground about this research is presented and a review on ACmotor control strategies is given.Then three mathematical models of PMSM are derived from coordinate transformationprinciple, which lay a model foundation for controller design of PMSM in following part. Next, some basic concepts and theories are listed. At the same time, the PBC designmethods of port-controlled Hamiltonian systems with dissipation are explained, which lay atheory foundation for PBC algorithm design.Finally, a PMSM speed controller is designed by using PBC principle, and systemsimulation is carried out with Matlab. Compared to Proportional-Integral-Derivative (PID)control method, PBC system has a simpler structure and it is easier to adjust. The simulationresults indicate the speed control system with PBC algorithm has higher accuracy andstronger disturbance rejection capability than those of PID control system. Furthermore, twoload observers are designed to compensate speed tracking error resulted by uncertain loaddisturbances, respectively. Also, some simulations demonstrate the effectiveness of the twoobservers.