Control arrangement for controlling the power supplied to an electric motor
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A control arrangement for controlling the power supplied to an electric motor connected to a rotary member to drive same in rotation by way of a belt drive, to accelerate the rotary member to a given speed and to brake it in a slip-free manner provides that a signal which is proportional to the speed of rotation of the rotary member is compared to a signal which is proportional to the speed of rotation of the motor. The supply of power to the electric motor is correspondingly controlled in dependence on the result of the comparison operation.
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Citations
16 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control arrangement for power supplied to an electric motor to produce a controlled speed of rotation of the motor, which is operable by way of a belt drive having a drive belt and a drive pulley adapted to be driven by the motor to drive and brake a rotary member mounted in a balancing machine for ascertaining unbalance thereof, comprising:
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a means for monitoring the speed of rotation of the motor and operable to supply a first signal which is proportional to the speed of rotation of the motor; a means for monitoring the speed of rotation of the rotary member and operable to supply a second signal which is proportional to the speed of rotation of the rotary member; a sensing means for sensing a marking on the rotary member and for supplying an output signal to serve as a phase reference signal in determining the angular positioning of at least one unbalance to be measured on the rotary member; means for deriving the second signal from the output signal of the sensing means; an adjusting means for adjusting the strength of one of the first and 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 for receiving the output signal of the comparison means to control the speed of the motor for a slip-free drive and a slip-free braking of the rotary member. - View Dependent Claims (13, 14, 15, 16)
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Specification