H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 5/00 (2006.01) H02P 7/285 (2006.01)
Patent
CA 2072071
ABSTRACT OF THE DISCLOSURE An impact load controller (28) compensates for the speed drop of a drive motor (12), which speed drop is caused by a load disturbance applied to the drive motor (123. A change in the dynamics of a speed controller (30, 34) in a speed regulator system for a stand in a tandem rolling mill is initiated by detecting a speed error (WE) which is greater than a predetermined speed error value and is removed after the speed error has been reduced to a predetermined value. The controller (28) is a pure rate controller whose input is converted into a rate of change in speed error, which is multiplied by a gain factor. The resultant gain value product is initially increased by a predetermined factor to provide a high input signal to the (PI) speed controller (34) of a multi-loop speed regulator system for the drive motor (12), and to precharge a low pass filter. Thereafter, the output of the impact load controller (28) is a function of the time constant of the low pass filter, whereby the product gain consisting of the rate of change in speed error decays exponentially. The load impact controller (28) can be either a microprocessor type of control arrangement or an analog type of control arrangement.
Aeg Westinghouse Industrial Automation Corporation
Mitchell Richard J.
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