Research on speed sensorless vector control system for mine electric motor vehicle

Abstract：Traditional speed sensor of mining electric vehicle has many drawbacks such as inconveniently installation, easy to be damaged, expensively maintaining, and poor anti-electromagnetic interference ability.Focusing on these problems, speed sensorless technique was introduced based on original variable-frequency drive, and model reference adaptive control was used as the control algorithm of the non-speed sensor.TMS320 F28335 DSP was used as the core and adopting vector control strategy and space vector pulse width modulation technique.The speed sensorless variable-frequency drive for the mining electric vehicle was developed.M language was used to simulate the whole system in MATLAB, and the results showed that the speed measurement effect of the proposed speed observer could be comparable to that of conventional optical-electricity encoders.The speed sensorless vector control system was tested by the three-phase asynchronous motor test in laboratory, and the results showed that asynchronous motor had good performance under no-load current, load current and variable speed conditions, which demonstrated that this driving device had stable speed control performance, and could greatly reduce the workload of the electric vehicle, so as to meet the demand of mine for traction.

Keyword：mine electric motor vehicle;vector control;model reference adaptation;speed sensorless;