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Title:
ROTATION-CONTROL UNIT FOR DC MOTOR
Document Type and Number:
Japanese Patent JP3812712
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To exactly detect a rotational speed and the number of revolutions of a brush-type DC motor with a simple and spaceless configuration, and to enable an effective rotation control.
SOLUTION: A pulse-number count means 151 of a motor-control circuit 15 counts the number of output pulses of a comparator 14 and gives the number to an accumulated revolution-number calculation means 152. The accumulated revolution-number calculation means 152 calculates the accumulated number of revolutions of a rotor, i.e., a motor, based on the number of pulses given by the pulse-number count means 151. A remaining revolution-number calculation means 153 calculates the remaining number of revolutions, which is before reaching a target accumulated number of revolutions, based on the accumulated number of revolutions calculated by the accumulated revolution-number calculation means 152 and based on the target number of revolutions, and feeds a motor-control signal that corresponds to the remaining number of revolutions to the motor-driving circuit 12.


Inventors:
Yoshimi Ohno
Tsurukawa Ikuya
Kenji Koyama
Application Number:
JP2000179192A
Publication Date:
August 23, 2006
Filing Date:
June 14, 2000
Export Citation:
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Assignee:
株式会社リコー
International Classes:
H02P3/08; H02P7/06; H02K23/00; (IPC1-7): H02P5/06; H02K23/00; H02P3/08
Domestic Patent References:
JP5038178A
JP4127864A
Attorney, Agent or Firm:
Shuji Sanada