Constant torque generator

  • Inventors:
  • Assignees: Ricoh Co Ltd
  • Publication Date: October 24, 1981
  • Publication Number: JP-S56136196-A

Abstract

PURPOSE:To gain constant torque regardless of temperature fluctuation by giving the correction signals according to the detection temperature of the temperature detector having the same temperature-resistance characteristic to a rotary disc of a constant torque generator to the speed controlling circuit or to the magnetic circuit. CONSTITUTION:When a driving shaft 11 of a motor 1 is made to rotate at a fixed speed, en bloc a magnetic circuit part 13 rotates and a rotary disc 16 relatively crosses the magnetic flux of the gap 15 so that an eddy current generates to receive the torque in proportion to the number of revolutions. On the other hand a temperature detector having the same temperature-resistance characteristic to the rotary disc 16 is arranged near the rotary disc 16 to detect the resistance fluctuation at the temperature fluctuating time as opposed to the reference temperature to give the temperature compensation signals to the speed control circuit of the motor or to the magnet circuit part 13 to gain the fixed torque.

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    Publication numberPublication dateAssigneeTitle
    JP-H0246195-AFebruary 15, 1990Star Micronics Co LtdDriving control for stepping motor