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Motor control device for controlling motor speed depending on imparted load

  • US 5,317,668 A
  • Filed: 06/08/1992
  • Issued: 05/31/1994
  • Est. Priority Date: 06/19/1991
  • Status: Expired due to Fees
First Claim
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1. A motor control device for controlling rotation speed of a single motor driving a plurality of mechanisms, an electrical current level which is applied to the single motor being changeable in accordance with the operation of one of the mechanisms, the control device comprising:

  • detection means for detecting an actual rotation speed of the single motor;

    storage means for storing a prestored rotation speed value of the single motor;

    means for comparing the actual rotation speed of the single motor detected by the detection means with the prestored rotation speed value stored in the storage means;

    means for selecting a current level necessary to obtain the prestored rotation speed, the selected current level being substantially proportional to a level of load imparted on the single motor;

    means for setting an offset current level and an offset current applying period to obtain said necessary current level on a basis of the level of load; and

    means for applying said offset current level to said motor for said offset current applying period.

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