Research On Position Decoding Algorithm And Control Strategy Of AC Servo System

The requirements for the control performance of AC servo systems in industrial production are increasing day by day.As a commonly used control strategy,fieldoriented control is closely related to the detection accuracy of the rotor position angle.In this paper,the resolver position sensor of the AC servo system is decoded in various ways to improve the accuracy of the position calculation and reduce the calculation delay and hardware cost.This article first designs the field-oriented control platform and servo control algorithm of the AC servo system based on the TMS320F28379 D chip,and realizes the dual-channel sampling scheme of the ADC and Sigma-Delta of the resolver feedback signal.Secondly,discrete Fourier transform is used to process the resolver signal to obtain the envelope of the resolver signal,and the open-loop algorithm of the rotor position angle,namely the arctangent method,is completed.In addition,the half-wave Fourier method and the quarter-wave Fourier method are studied and analyzed,and the feasibility of increasing the position angle refresh rate of the arctangent solution algorithm from 10 k Hz to 20 k Hz and 40 k Hz is proposed.Finally,a digital R/D conversion circuit based on the principle of phase-locked loop is designed,and the closed-loop soft solution of the resolver position angle is realized.The experiment tests the accuracy and delay of the two resolution digital R/D conversion circuits,and controls the servo motor to use different resolution resolution systems in different speed ranges to reduce the tracking error in the full speed section.The tracking error is further reduced by increasing the closed-loop phase-locking frequency and error compensation.The experiment verifies the feasibility and effectiveness of the proposed method.