Title:
SPEED CONTROLLING DEVICE FOR MINIATURE DC MOTOR
Document Type and Number:
Japanese Patent JPS55125087
Kind Code:
A
Abstract:
PURPOSE:To keep torque characteristic unchanging even from transferring rotational speed by connecting a junction of two series diodes for reference voltage and a junction of two series resistances to the base of detecting transistor through a variable resistance and a switch. CONSTITUTION:That for which diodes D1, D2 are connected in series is used for a reference voltage source of a bridge circuit, resistances 15, 16 are connected in series between a junction of the diodes D1, D2 and the pluse side of a power supply 8, and a junction of the resistances 15, 16 is connected to the base of a detecting transistor 7 through a switch and a variable resistance 17. Values of the resistances 15, 16 are selected properly and by changing a value of the variable resistance 17, the second rotational speed same in torque characteristic as the rotational speed for which the switch 18 has been kept close is obtainable.
Inventors:
NOGUCHI KAZUO
Application Number:
JP3252979A
Publication Date:
September 26, 1980
Filing Date:
March 20, 1979
Export Citation:
Assignee:
TOKYO PARTS KOGYO KK
International Classes:
H02P7/288; (IPC1-7): H02P5/16