Abstract: Based on the AC-DC-AC variable frequency speed control system of synchronous motor，the

parameters of PI regulator were optimized by chaos particle swarm optimization algorithm. A pseudo-random

sequence generation method was constructed using a chaotic map dynamic integer tent map，and an objective function of particle swarm optimization algorithm was designed，which could directly reflect the step response performance index of the control system.The simulation results of flux linkage adjustment show that the rise time，adjustment time and overshoot of the system optimized by the chaos particle swarm optimization algorithm are reduced by 8.7%，32.5% and 48.4% respectively compared with the traditional algorithm.The situation of production field shows that the optimized system can meet the actual production needs.

      Key words: PI regulator；integer chaotic mapping；particle swarm optimization（PSO）