Experiment and simulation of torsional vibration based on sensorless detection technology under variable-frequency power sources

To research the effect of stator current of asynchronous motor on shafting torsional vibration under variable-frequency power sources, a simulation model of shafting torsional vibration detection based on MATLAB/SIMULINK is aiming at revealing response and law of stator current on shafting torsional vibration in the event of inverter power supplying, which takes advantage of emulational variable-frequency module of asynchronous motor connected with torsional torque signal of square-wave transformation externally, emulational motor and shafting torsianl vibration of driven devices. A test device driven by the induction motor with a DC generator as load is set up for the simulation of torsional vibration of the shafting. With the rapid on-off changes via computer-controlled load circuit simulating torsional vibration of the shafting, simulation experiments are in coincidence with the simulation results, which confirms the wide application of torsional vibration based on sensorless detection technology under variable-frequency power sources.