In order to improve the anti-interference ability of permanent magnet synchronous motor speed control system

a robust H∞ control method is proposed. Firstly

according to the principle of robust H∞ control

the design method of permanent magnet synchronous motor speed control is proposed

and the solution method is introduced. The tracking performance

disturbance suppression

output limitation and model uncertainty are considered when designing the weighting function. The influence of the performance weighting function on the dynamic performance is illustrated in detail by means of the Bode diagram

and the design method of the weighting function is given. Then

in order to further improve the disturbance rejection of the system by considering the parameter uncertainty and unmodeled dynamics

the disturbance is observed as a feedforward compensation through the Luenberger observer and feed back into the speed controller to accelerate the dynamic response and enhance the disturbance rejection. Finally

the traditional proportional-integral controller

H∞ speed controller

and the proposed composite speed controller are compared by experiments

and the effectiveness of the proposed speed controller are verified by the experimental results.