Title:
SPEED CONTROL DEVICE OF COMPACT DC MOTOR
Document Type and Number:
Japanese Patent JPS5875489
Kind Code:
A
Abstract:
PURPOSE:To eliminate the instability in case of a low speed revolution resultant from resistance fluctuation depending upon location of rotor by a method wherein the resistance for controlling the gain of amplifier for driving motor is eliminated and the balance of bridge circuit is deflected by the amount equivalent to the resistance for controlling gain. CONSTITUTION:A bridge circuit is formed by motor 1, resistors 2', 3, and 4 to drive the motor 1 by means of the output of amplifier 8 while the counter electromotive force is detected by the differencial amplifier 14 being fedback into input terminal of said amplifier 8 to maintain the specified speed. At this time, the resistor 2' in the bridge circuit is determined by the value equivalent to the feedback resistance when the DC voltage output from said differencial amplifier 14 is impressed on the bridge circuit through the intermediary of resistor 13 without applying the feedback resistance to said amplifier 8. Through these procedures, the instability resultant from resistance fluctuation depending upon location of rotor may be eliminated improving the controllability because the feedback into said amplifier 8 is equivalent to the sum of the DC voltage from said differencial amplifier 14 and said counter electromotive force.
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Inventors:
KADOSAWA TSUNEAKI
Application Number:
JP17355981A
Publication Date:
May 07, 1983
Filing Date:
October 29, 1981
Export Citation:
Assignee:
CANON KK
International Classes:
H02P7/06; H02P7/288; (IPC1-7): H02P5/06; H02P5/16
Domestic Patent References:
| JPS5534875A | 1980-03-11 |
Attorney, Agent or Firm:
Marushima Giichi