Speed controller

Abstract

Abstract PURPOSE:To facilitate speed control by using a voltage value maintained, when a speed signal generation output corresponding to the speed of an object to be controlled coincides with the frequency of a reference signal as the voltage value of a drive control signal. CONSTITUTION:A control signal W varying according to respective areas is supplied to a driver 23 so as to supply current quantity in proportion to the voltage ratio of the control signal at respective points of time to a spindle motor 24 to rotate a disk 1. When a normal state is achieved, a comparison output U from a comparator 13 comes to L-level and a switch circuit is opened and the voltage value immediately before is maintained in a capacitor 20 as the voltage value of the control signal W. The current of corresponding quantity to this voltage value is supplied to the spindle motor 24 and comes to be a reference voltage value for maintaining a steady state. Accordingly, it is unnecessary to set previously a prescribed voltage for maintaining the steady state of the object to be controlled.

Inventors

• 👤 Yoshihiro Matsushima

Bibliographic Details