US 11,888,430 B2
System and method of increasing resolution of position feedback for motor control
John A. Backman, Cedarburg, WI (US); and Bryan Radke, West Allis, WI (US)
Assigned to Magnetek, Inc., Menomonee Falls, WI (US)
Filed by Magnetek, Inc., Menomonee Falls, WI (US)
Filed on May 17, 2021, as Appl. No. 17/322,025.
Prior Publication US 2022/0368252 A1, Nov. 17, 2022
Int. Cl. B66B 1/30 (2006.01); H02P 6/15 (2016.01)
CPC H02P 6/153 (2016.02) 20 Claims
OG exemplary drawing
 
1. A method for increasing resolution of a position feedback signal to a motor drive, the method comprising the steps of:
receiving a position feedback signal at an input to the motor drive;
sampling the position feedback signal at a first time interval;
incrementing a pulse counter within the motor drive during the first time interval when a new pulse from the position feedback signal is detected;
reading a high resolution pulse count register from a high resolution pulse counter during each of the first time intervals;
adding a value of the pulse counter to the high resolution pulse count register during each of the first time intervals to obtain a new value for the high resolution pulse count register;
storing the new value in the high resolution pulse count register during each of the first time intervals; and
executing a speed regulator with a processor in the motor drive during a second time interval, wherein:
the speed regulator uses the high resolution pulse count register, and
the second time interval is longer than the first time interval.