APPARATUS FOR PREVENTING AN OVERRUN OF A SPINDLE MOTOR

摘要

A spindle motor controlling apparatus having a motor driving device, a motor speed controlling device, a MICOM (microcomputer) and an image processing device comprises a horizontal synchronization comparing device which detects a horizontal sychronization signal of the image processing device and compares the detected synchronization signal with a reference synchronization signal and applies the compared signal to the MICOM. The motor driving device further includes a switching part for providing a power according to the control signal of the MICOM to the spindle motor.