D. C. motor control system
First Claim
1. A control circuit for a direct current shunt field electric motor having a field current controller and an armature current controller, comprising:
- a source of a speed command signal for said motor;
a source of a signal representing the actual speed of said motor; and
means responsive to said speed command signal and said actual speed signal for generating current command signals to said field and armature controllers wherein the normalized values of said current command signals are proportional to the square root of the motor torque at the desired motor speed represented by said speed command signal.
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Accused Products
Abstract
A direct current motor control system for generating current command signals to a unidirectional armature controller and a bidirectional field controller. A motor speed command is compared with the actual motor speed to generate a speed error signal. The system generates a current command signal from the average of the speed error signal wherein the current command signal is proportional to the square root of the desired motor torque. The absolute value of the current command signal is the input to the armature controller and the field controller receives the current command signal wherein the polarity of the signal determines the direction of current flow in the field winding for controlling the direction of rotation of the motor.
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Citations
14 Claims
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1. A control circuit for a direct current shunt field electric motor having a field current controller and an armature current controller, comprising:
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a source of a speed command signal for said motor; a source of a signal representing the actual speed of said motor; and means responsive to said speed command signal and said actual speed signal for generating current command signals to said field and armature controllers wherein the normalized values of said current command signals are proportional to the square root of the motor torque at the desired motor speed represented by said speed command signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification