Researeh On Control Strategy Of Permanent Magnet Synchronous Motor Servo System

With the development of power electronics, microprocessors and control theory, the AC servosystem is widely used in the field of industrial control and household electrical，the concomitantincreasing performance requirements of the servo system. Permanent magnet synchronous motorservo system has a simple structure, small size, high efficiency, wide speed range, good static anddynamic characteristics, the digital signal processor for the control of the core, high-performancecontrol strategy of permanent magnet synchronous motor servo system servo drive trends inhigh-precision, high-performance requirements.Firstly, a detailed analysis of the mathematical model of the permanent magnet synchronous motor,starting from the idea of decoupling control, the vector control of permanent magnet synchronousmotor. For the current control mode, the permanent magnet synchronous motor using different controlstrategies, analysis and research on the principle and method of the space vector pulse widthmodulation (SVPWM). In order to improve system performance, designed the anti-windup PIcontroller and its application to the simulation model of the permanent magnet synchronous motorservo system, contrast classic PI control strategy.Secondly, the servo system has an offline simulation. Below base speed, use of a control method id=0, the method is simple, sinusoidal current, output torque and q-axis current are linear relationship;above base speed is automatically switched to the negative idfeedback flux-weakening controlmethod, the method without motor parameters, can improve the speed and torque of the motor,expand motor constant power region. Relay on DS1104real-time simulation system as the corecontrol device, design the software of the complete servo system. Respectively design of SVPWMgenerated, the angle detecting circuit, the current sampling circuit.Finally, the servo system hardware circuit design, including the DS1104interface board, SKiiP3-phase inverter bridges and signal conditioning board. Signal conditioning board include the gatedrive conditioning circuit, analog signal output conditioning circuit, CPLD hardware protection circuit.Permanent magnet servo system experimental results show that the system debugging success andsmooth operation, the entire servo system to verify the correctness and feasibility of the controlalgorithm.