Study on speed-sensorless vector control transducer based on DSP

In order to improve reliability and adaptability of control system for induction motors, a speed-sensorless vector control transducer based on DSP is presented. The principle of speed-sensorless vector control system is firstly introduced. The mathematic model of the three-phase induction motor is multi-variable, non-linear and strong-coupling, which are uncoupled by coordinate conversion. The detected two phase currents of the three-phase induction motor are imported to an adaptive voltage-model rotor flux estimator. PI self-adaptive algorithm is used to estimate the speed of the induction motor. By comparing the estimated-speed and the command-speed, the adjustment instructions are generated, which control the speed by Space Vector Pulse Width Modulation(SVPWM). In this paper, the hardware and software structures of speed-sensorless vector control transducer based on DSP are discussed in detail. The key parameters are confirmed by simulations based on Matlab/Simulink. Finally, the designed scheme is demonstrated feasible and effective by the experiments.