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US 4,227,130 AGranted
Torque compensation system
AssigneeWestinghouse Electric Corp.
InventorsMohammed Safiuddin, Henry A. Dickerson
Life of this patent
Estimating the term…
Abstract
A torque compensation system is disclosed for d.c. motor drives using field weakening for speed control. A diode switching matrix and a static divider are connected so that the divider receives signals which are functions of motor armature current and speed respectively, and delivers at its output a signal which is proportional to motor torque for adjusting the speed reference to the motor.
Claims5
A torque compensation system for a speed regulated d.c. motor using field weakening for speed control in a production mill comprising:
- (a) linear switching means having first and second inputs and an output, the first input receiving a signal .omega..sub.m which is a function of the speed of the motor, the second input receiving a signal .omega..sub.m =1 which is a function of the rated speed of the motor, the output of said switching means being the greater of its inputs;
- and
- (b) divider means having a dividend input for receiving a current signal I.sub.a from the motor armature which is a function of the rated armature current, and a divisor input connected to the output of said linear switching means and having circuit means for generating a quotient output which is a torque compensation signal V.sub.t equal to I.sub.a for all .omega..sub.m .ltoreq.1 and equal to ##EQU8## for all .omega..sub.m >1, and (c) means for regulating the speed of the d.c. motor in response to a mill speed reference and in response to the signal V.sub.t so as to provide motor torque compensation for control of tension in material being operated upon in the production mill.
Dependencies are inferred from the claim text.