A sensorless speed positioning method and system for linear motor of a suspended electromagnetic propulsion system

Abstract

A sensorless velocity measurement and positioning method and system for a linear motor in a suspended electromagnetic propulsion system is disclosed. The positioning method includes: observing unmodeled disturbances in a coordinate system using a designed disturbance observer to obtain the observed disturbance values ​​in the coordinate system; converting the observed disturbance values ​​in the coordinate system into a coordinate system and inputting them into an improved adaptive superspiral sliding mode back EMF observer to obtain the back EMF signal in the coordinate system, which is then input into a third-order orthogonal normalized phase-locked loop to obtain the position and velocity of the superconducting permanent magnet synchronous linear motor; and designing an extended state observer to input the position and velocity of the superconducting permanent magnet synchronous linear motor obtained from the third-order orthogonal normalized phase-locked loop into the extended state observer to obtain the optimized position of the superconducting permanent magnet synchronous linear motor. This invention can operate effectively in a linear motor of a suspended electromagnetic propulsion system and has good sensorless control performance.

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