Title:
MOTOR CONTROL CIRCUIT AND VTR USING THE SAME
Document Type and Number:
Japanese Patent JP3510702
Kind Code:
B2
Abstract:
PURPOSE: To provide a motor control circuit in which hunting at the time of switching a speed is suppressed and the speed can be early converged to a desired speed.
CONSTITUTION: A switch 8 is turned off during the transition of the speed for altering the speed of a capstan driving motor 1 in the search mode of a VTR to inactivate a phase servo system, a switch 12 is shifted to a contact side, the filter 11 of a speed servo system is removed from a servo loop, a switch 6 is shifted to a contact side, and the gain of a speed servo system is lowered to 1/N. Thus, the speed is rapidly switched to a desired speed while preventing a hunting without oscillating the servo loop.
Inventors:
Sawamura, Akira
Onishi, Yasuyuki
Onishi, Yasuyuki
Application Number:
JP10362495A
Publication Date:
March 29, 2004
Filing Date:
April 27, 1995
Export Citation:
Assignee:
ROHM CO LTD
International Classes:
G11B15/46; G11B15/467; G11B15/52; H02P29/00; H02P29/20; G11B15/18; (IPC1-7): H02P5/00; G11B15/46
Attorney, Agent or Firm:
佐野 静夫