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Control arrangement for controlling the power supplied to an electric motor

  • US 4,980,621 A
  • Filed: 11/20/1989
  • Issued: 12/25/1990
  • Est. Priority Date: 11/20/1989
  • Status: Expired due to Fees
First Claim
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1. A control arrangement for power supplied to an electric motor to produce a controlled speed of rotation of the motor which, by way of a belt drive having a drive belt and a drive pulley adapted to be driven by the motor, accelerates a rotary member up to a given speed of rotation and brakes it, comprising:

  • a means for monitoring the speed of rotation of the motor and operate to supply a first signal which is proportional to the speed of the rotation of the motor;

    a means for monitoring the speed of rotation of the rotary member and operate to supply a second signal which is proportional to the speed of rotation of the rotary member;

    an adjusting means for adjusting the strength of one of the first and the second signals;

    a comparison means, connected to the adjusting means to receive the one adjusted signal and connected to receive the other of the first and second signals, for comparing the adjusted signal and the other signal and for supplying an output signal which is proportional to the result of the comparison; and

    a motor speed control means connected to the output of the comparison means for receiving the output signal of the comparison means and operable to control the motor for slip-free drive and slip-free braking of the rotary member.

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