Novel Open-Loop Control Theory of Permanent Magnet Synchronous Motor

With more and more application of permanent magnet synchronous motor in energy conservation and emission reduction field, open-loop control strategies were used widely for no-high dynamic requirement. The voltage amplitude in each speed range was the key factor of the open-loop control system. Based on the principles of the open-loop control system, performances of different voltage amplitude under different frequency were studied; furthermore, analysis of the current-output characteristic were provided. Experiment results indicates the effects of the theory

The Comparison Research of Rotor Resistance Robust Observer Based on Vector Controlled IM Drivers

In the technology of sensorless vector control, the rotor resistance uncertainty has important influences on the accurate observation of the rotor flux and identification of the rotor speed. The rotor resistance robust observer which has rotor resistance uncertainty suppression on the speed identification is presented. According to the Lyapunov stability theory, a new Lyapunov function is setted, in theory, could ensure the stability of observer in the full speed range, then the rotor speed adaptive law is deduced. Make a comprehensive simulation comparison with the current popular resistance and the rotor speed dual identification method, the studies show that: the proposed rotor resistance robust observer method in the range of speed has a good suppression of rotor resistance uncertainty on the pace of speed identification and a high robustness, as well as its small amount calculation, simple structure, easily meets the performance of real-time, it has more advantage on the engineering application