Title:
SPEED CONTROL CIRCUIT OF MOTOR
Document Type and Number:
Japanese Patent JPS61244283
Kind Code:
A
Abstract:
PURPOSE:To accurately and effectively discriminate a motor at starting and ordinarily rotating time by detecting a voltage applied to a coil terminal of the motor to discriminate the starting time and the ordinarily rotating time. CONSTITUTION:A voltage applied to a coil 9 is rectified by a diode 11 by removing a DC component by a capacitor 10. Then, its peak is held by a capacitor 12. The voltage of the capacitor 12 is compared by a comparator 14 with the level of the compared voltage 13, and output to an output terminal 5. 'High level' is output at the starting time and 'low level' is output at ordinarily rotating time to an output terminal 15. This output is used to operate to alter motor coil drive power source voltage at starting and ordinarily rotating time.
Inventors:
TAKEDA KATSUNOBU
UEHARA MASAHIRO
UEHARA MASAHIRO
Application Number:
JP8243785A
Publication Date:
October 30, 1986
Filing Date:
April 19, 1985
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H02P1/16; (IPC1-7): H02P1/16
Attorney, Agent or Firm:
Katsuo Ogawa