Electronic dynamic compensator of the servo device of optical pickup head

The present invention comprises an electronic dynamic compensator of the servo device of optical pickup head, wherein an position signal is inputted, transformed by a filter transfer function, and a compensation signal is outputted. When the processor sends a high speed rotational signal, the rotational motor proceeds the high speed rotational movements, the high speed rotational movement makes the switch conduct. Although the servo controller outputs the small signal gain, the switch conducts in response to the state of high speed rotational movement of the rotational motor, and the electronic dynamic compensator outputs the compensation signal to the summation nodes, the summation nodes outputs a high gain signal to the pickup head. For the servo controller, the equivalent mass, equivalent elasticity, equivalent viscosity and dynamic characteristics of the optical pickup head system it faces are all changed. The equivalent system dynamic characteristics can be regarded as the effect of optical pickup head plus the electronic dynamic compensator, wherein a very good system dynamic characteristics can be obtained by specifying appropriate poles and zeroes.