Load impact controller for a speed regulator system
First Claim
1. A speed regulator drive system for regulating the speed of a drive motor, comprising:
- means for determining a speed error based on an actual speed value and a desired speed value and for using said speed error during the normal operation of said drive motor, andimpact load controller means for producing a first output, said first output used to compensate for a reduction in said speed from a steady state speed in said normal operation of said drive motor and for supplementing at least said speed error for said regulating of said drive motor when a load disturbance is applied to said drive motor,said impact load controller means comprising;
rate controller means for receiving said speed error, for determining rates of change in said speed error, and for producing a gain value product including said rates of change in said speed error,means for initially increasing said gain value product to a first value by a desired amount to proportionately increase said speed of said drive motor to a value above said steady state speed, andfilter means for receiving said first gain value product for precharging said filter means and for subsequently receiving second gain value products for exponentially decreasing said speed of said drive motor until said speed reaches said steady state speed.
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Accused Products
Abstract
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 (12). 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 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.
24 Citations
41 Claims
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1. A speed regulator drive system for regulating the speed of a drive motor, comprising:
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means for determining a speed error based on an actual speed value and a desired speed value and for using said speed error during the normal operation of said drive motor, and impact load controller means for producing a first output, said first output used to compensate for a reduction in said speed from a steady state speed in said normal operation of said drive motor and for supplementing at least said speed error for said regulating of said drive motor when a load disturbance is applied to said drive motor, said impact load controller means comprising; rate controller means for receiving said speed error, for determining rates of change in said speed error, and for producing a gain value product including said rates of change in said speed error, means for initially increasing said gain value product to a first value by a desired amount to proportionately increase said speed of said drive motor to a value above said steady state speed, and filter means for receiving said first gain value product for precharging said filter means and for subsequently receiving second gain value products for exponentially decreasing said speed of said drive motor until said speed reaches said steady state speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A speed regulator drive system for regulating the speed of a drive motor and having first speed controller means, comprising:
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means for determining a speed error which is the difference between an actual speed value and a desired speed value, and impact load controller means for compensating for a reduction in said speed from a steady state condition due to a load disturbance applied to said drive motor, said impact load controller means comprising; filter means, and means for producing an initial signal and a series of sequential signals which are a function of a rate of change in said speed error, and including means for applying said initial signal to said first speed controller means for an increase in said speed of said drive motor which is greater than said steady state condition, and for applying said sequential signals to said filter means for further control of said first speed controller means for exponentially decaying said speed of said motor to its said steady state condition. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. An impact load controller for controlling the dynamics of a drive motor whose speed is reduced from a steady state condition due to a load disturbance applied to said motor, said impact load controller comprising:
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means for producing a signal which is a function in a rate of change in a speed error, which speed error is the difference between a desired speed value and an actual speed value, and including means for producing a gain value product for said signal, and means for applying said signal to said drive motor to first increase said speed of said drive motor above said steady state condition and to sequentially decrease said speed of said drive motor until it reaches said steady state condition.
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26. A method for controlling the dynamics of a drive motor whose speed is reduced from a steady state speed due to a load disturbance applied to said motor, the steps comprising:
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using a rate of change in speed error, which speed error is based on the difference between a desired speed value and an actual speed value, producing a gain value product for said rate of change in said speed error, combining said gain value product with at least said speed error to initially increase said speed of said drive motor above said steady state speed, and thereafter to decrease said speed of said drive motor until it reaches said steady state speed.
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27. A method for compensating for a reduction in speed of a drive motor from a steady state speed due to a load disturbance applied to said drive motor, the steps comprising:
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(a) determining a speed error based on an actual speed value and a desired speed value, (b) determining the rate of change in said speed error, (c) producing a gain value product for said rate of change in said speed error, (d) initially increasing said gain value product to a first value by a desired factor to proportionally increase said speed of said drive motor above said steady state speed, and (e) after said initial increase in said speed of said motor, filtering sequentially said gain value products to exponentially decrease said speed of said drive motor until said speed reaches said steady state speed. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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36. In a speed regulator drive system in which the speed of a drive motor is controlled by a speed error signal, a load impact controller for compensating for reduction in speed of said drive motor from a steady state speed due to impact loads, said load impact controller comprising:
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means for generating a load impact correction signal which is a step function of the rate of change of the speed error and modified to decay with time, and including means for generating a rate signal proportional to said rate of change of said speed error, and summer means for adding said load impact correction signal to said speed error signal to control the speed of said drive motor for returning said drive motor to its said steady state speed. - View Dependent Claims (37, 38, 39, 40, 41)
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Specification