Magnetic disc device

Abstract

Abstract PURPOSE:To prevent the generation of re-seek control by changing over the control into the speed control so as to restore a VCM within a supervisory position if the VCM is deviated out of the set supervisory position and changing over the control to the positioning control when the VCM restores within the supervisory position. CONSTITUTION:An MPU7 grasps the speed and control state of a voice coil motor VCM at preset point of time based on the inputted data and its data and speed information/control information being a reference stored in a reference information memory circuit 10. When the VCM is not reached to a positioning control start position (b), a speed error signal with the reference speed is outputted to a VCM drive circuit 9 via a D/A converting circuit 8 and a switching circuit 12 so as to apply the speed control. When the movement of the VCM reaches the positioning control start position (b), the switching circuit 12 is switched to the position of an analog positioning circuit 11 by the control of the MPU7 and the analog positioning circuit 11 applies position control. Thus, the generation of a seek error due to instability of seek control is prevented.

Inventors

• 👤 Takeo Masuda
• 👤 竹夫 増田

Bibliographic Details