Patent ID: 6259222
Filing Date: 2001-07-10
Classification: B02C

Abstract:
A device for controlling load on a first motor whose load is affected by a second motor, comprising:a) a controller having a first input for being connected to a horsepower transducer connected to the first motor being monitored and an output for being connected to the second motor;b) a program configured to receive said first input and generate said output responsive to said input;c) said program comprising a first counter for accumulating the number of occurrences within a block of time said first input is above an upper limit, a second counter for accumulating the number of occurrences during the block of time said first input is between the upper limit and a lower limit, a third counter for accumulating the number of occurrences during the block of time said first input is below said lower limit, and a fourth counter for accumulating the total number of occurrences of said first input in said first, second and third counters during the block of time;d) said program comprising generating a percentage of the number of occurrences in said first counter relative to the total number of occurrences, and if greater than a predetermined value, decreasing said output, thereby to slow down the second motor;e) if said percentage is below the predetermined value, and if the number of occurrences in said second counter is less than the number of occurrences in said third counter, increasing said output, thereby to speed up the second motor; andf) if said percentage is below the predetermined value, and if the number of occurrences in said second counter is more than the number of occurrences in said third counter, maintaining said output at the present level, thereby to maintain the present speed of the second motor.