US 7,321,211 B2
Power variation control system for cyclic loads
Ronald G. Peterson, Racine, Wis. (US)
Assigned to Unico, Inc., Franksville, Wis. (US)
Filed on Apr. 28, 2006, as Appl. No. 11/380,861.
Prior Publication US 2007/0252546 A1, Nov. 01, 2007
Int. Cl. H02P 23/04 (2006.01)
U.S. Cl. 318—432  [318/268; 318/448; 166/104; 417/45] 34 Claims
OG exemplary drawing
 
1. A method for reducing the power demand variations of a motor for driving a mechanical system having a cyclic load and a rotating inertia, the method comprising the steps of:
determining a signal representing a velocity output of the motor;
generating a torque limit signal by multiplying a signal representing a desired power level of the mechanical system by a torque scaling factor divided by the signal representing the velocity output of the motor; and
causing the motor to operate at the torque represented by the torque limit signal.