Research On Loading Motor Driver With Energy Feedback

The main research object in this paper is a kind of electric load simulator system, which uses permanent magnet DC motors as its actuators. The ultimate goal is to design a kind of high performance driver with energy feedback features for the loading motor. Electric load simulator is used in the ground-based simulation systems, to provide dynamic pneumatic load for missiles'servo rudders in flight conditions, which is a special passive torque servo system. As a direct motor-driven device, loading motor driver plays an important part in the whole system. Its ability decided the performance of the loading motor. How to choose the circuit topology and control program of the driver is the key to achieve a high performance, high reliability, efficiency and high adaptability driven effect.Firstly, this paper established the mathematical model of the system. Then the feasibility of loading torque control based on the armature voltage control is tested. Frequency characteristics method is used to analyze the stability and loading potential of the system. To improve system stability and steady-state accuracy, torque differential negative feedback and PI regulator is used for system compensation.As the classical DC servo drive system has an uncontrollable front rectifier, it has terrible harmonic current, one-way flow of energy and a poor system efficient. Several of high-performance front-end rectifier topologies are proposed, and their working principle and performance are analyzed in detail. Considering the system requirements, the system's components costs, and degree of the control difficulty, the back-to-back double H-bridge structure is chosen to be the loading motor driver topology. And then, the design of system hardware and the process of software are given.Finally, loading driver system is simulated in MATLAB in the condition of constant and sinusoidal torque load with and without disturbance. Simulation results show that the proposed driver topology not only achieved a two-way flow of energy, but also gain a better system performance with a particularly low harmonic current level in the input current.