High Disturbance Rejection Position Detection Method Of Contra-rotaring Permanent Magnet Synchronous Motor

In recent years,various countries continue to increase the development and exploration of Marine resources,so the performance requirements for underwater vehicles and other Marine equipment are increasingly high.Contra-rotating propeller propulsion system is used in most underwater vehicles to avoid rolling.Contra-rotating permanent magnet motors are diffusely used to drive counterrotating propellers because of their special motion form.For underwater vehicle,the rotor position detection is easily affected by the working environment and electromagnetic interference due to its harsh working environment and complex electromagnetic environment,which affects the detection accuracy of rotor position.On this basis,this paper studies the high disturbance rejection position detection method of contrastive rotating permanent magnet motor.The main work is as follows:Firstly,the mathematical model and control strategy of the contrastive rotating permanent magnet motor are studied.Then,the load model of the underwater drive is analyzed based on the fact that the two rotors’ speed cannot be controlled separately.Then,the Angle measuring system based on the rotary transformer is summarized.Finally,the influence of various forms of errors on the position detection results is analyzed based on the tracking Angle m easuring system.Secondly,the position decoding strategy in the contrastive permanent magnet motor system is studied.Based on the Angle measurement method of rotary transformer,the traditional algorithm of axis Angle transformation based on arctangent and phase-locked loop is analyzed.Then,aiming at the defects of the traditional algorithm of axis Angle transformation,in order to improve the anti-interference ability,the algorithm of axis Angle transformation based on Lomborg observer is studied.Finally,the advantages and disadvantages of several shaft-angle transformation algorithms are analyzed and verified by simulation.Thirdly,the rotor position error exists when the traditional shaft-angle transformation algorithm decodes the non-ideal rotation signal,and the rotor position Angle online compensation strategy is proposed.The influence of the rotor position error on the performance of the rotating permanent magnet motor system was analyzed,and the unknown parameters of the rotor position error w ere identified by Kalman filter,so as to calculate the rotor position error to compensate the rotor position Angle in real time.Finally,the compensation strategy of rotor position Angle is verified by simulation.Finally,different algorithms are used to suppress the errors and noise interference in the output signals of the rotating transformer.DSRF-PLL and double generalized second order integrator are used to extract the positive sequence components of the rotating signal,and the amplitude and phase e rrors are suppressed.Based on the improved double generalized second order integrator,the zero error is suppressed.Harmonic separation method to suppress harmonic error;The phase discriminator without phase difference is used to suppress the noise interference,and a filter based on EKF principle is proposed to suppress the harmonic error,zero error and random noise simultaneously.Finally,the simulation results show that the various algorithms are effective in suppressing errors and noises.