Title:
SPEED CONTROL CIRCUIT FOR DC MOTOR
Document Type and Number:
Japanese Patent JPS58165681
Kind Code:
A
Abstract:
PURPOSE:To perform a preferable speed control by a DC motor which has small counterelectromotive force characteristic by employing as the control signal of a drive circuit for the DC motor the error detection voltage between a rotating speed proportional voltage and a divided voltage of a reference voltage. CONSTITUTION:A variable resistor 13 provided as voltage dividing means regulates a reference voltage Vref of a reference voltage source 8 in an IC15, thereby freely controlling it from 0V to (1+RD/RC) times even if the reference voltage source in the IC15 is stationary, and thus freely controls the reference voltage Vref =Vref.RA/(RA+RB) from 0V to (1+RD/RC) times. When the reference voltage Vref is set to the prescribed value, the input terminal 6 of an error detector 5 can be set to the Vref, a drive transistor 3 and a shunt transistor 11 can be controlled by the output of the detector 5, thereby obtaining constant rotating speed of a DC motor 2.
Inventors:
ISHIDA TSUNEHISA
Application Number:
JP4930282A
Publication Date:
September 30, 1983
Filing Date:
March 26, 1982
Export Citation:
Assignee:
SANYO ELECTRIC CO
TOKYO SANYO ELECTRIC CO
TOKYO SANYO ELECTRIC CO
International Classes:
H02P7/288; (IPC1-7): H02P5/16
Domestic Patent References:
| JPS5625392A | 1981-03-11 |
Attorney, Agent or Firm:
Takuji Nishino