Aiming at the effect of force ripple on permanent magnet synchronous linear servo system

a control strategy

position adaptive compensation

is proposed. To simplify the mathematical model of the force ripple

the characteristic frequency can be firstly obtained off-line with fast Fourier transform(FFT)analysis. The model parameters of the force ripple can be identified on-line with recursive least squares algorithm. Combining with the characteristic frequency and the model parameters

the precise estimation of the force ripple is realized. The estimation model of the force ripple is directly applied to the real-time compensation for permanent magnet synchronous linear servo system. The experiments for verifying the above control strategy show that the maximum fluctuation error of position tracking is reduced from 50 μm to less than 20 μm

and the position control performance is improved obviously.