Research on Sensorless Control of ROV Permanent Magnet Propulsion Motor at Low Speed
In order to improve the performance of ROV propulsion system,permanent magnet synchronous motor is usually used as the propulsion motor.In addition,sensorless position estimation can improve the application range of the propulsion motor,and the estimation results can represent the redundancy of the mechanical sensor measurement values.This paper proposes a high frequency injection algorithm combined with second-order generalized integrator(SOGI).Through the approximate calculation of the q-axis current directly related to the rotor position,the position and rotor speed are accurately estimated.In addition,the har-monic of the estimated position is effectively reduced by introducing a second-order generalized integrator.Then,the reliability of the rotor position estimation algorithm is verified by selecting different low-speed experiments in Matlab/Simulink.
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维普
