A new control method of disturbance compensation based on acceleration signals is proposed to enhance the servo function of the speed control system of a DC torque motor in a precise photoelectric stabilizedplatform and to make the system have better dynamical functions and stronger abilities of disturbance rejection. In this method

a nominal controller is established and a rejection observer is created using acceleration signals to compensate quickly and precisely the external disturbance and to reduce the effect of the model error. Thus the dynamical function and the disturbance rejection ability are enhanced. The experiment result shows that this control method can improve the dynamic performance of the motor control system

which accelarates motor responds and restrains orershoots.For the step external disturbance

the system speed only shows a pulse fluctuation with a width of 0.1 s

and the amplitude is one half of that of PID controller. Besides

the control system is robust towards the uncertainty of the motor model. These results show that the method with magnificent effects and good applications is very suitable for engineering.