US 12,278,580 B2
Systems and methods for controlling inducer motor speed
Harshal Manik Pawar, Pune (IN); and John F. Broker, Warrenton, MO (US)
Assigned to Copeland Comfort Control LP, St. Louis, MO (US)
Filed by Copeland Comfort Control LP, St. Louis, MO (US)
Filed on Mar. 7, 2023, as Appl. No. 18/118,311.
Application 18/118,311 is a continuation in part of application No. 17/481,859, filed on Sep. 22, 2021, granted, now 11,611,302.
Claims priority of application No. 202021041848 (IN), filed on Sep. 26, 2020.
Prior Publication US 2023/0208333 A1, Jun. 29, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02P 25/04 (2006.01); H02P 21/18 (2016.01); H02P 27/04 (2016.01)
CPC H02P 25/04 (2013.01) [H02P 21/18 (2016.02); H02P 27/045 (2013.01)] 27 Claims
OG exemplary drawing
 
20. A system for controlling inducer motor speed, the system comprising:
a switching device configured to be operable for changing stator voltage of an inducer motor;
a speed sensor configured to be operable for determining actual inducer motor speed; and
a control configured to be operable for changing the stator voltage of the inducer motor to a value at which the actual inducer motor speed is controllably regulated and/or maintained substantially at a set speed without significant speed oscillations;
wherein:
the control is operable for determining whether the actual inducer motor speed is greater than a sum of the set speed plus a first delta speed; and
upon the control determines that the actual inducer motor speed is greater than the sum of the set speed plus the first delta speed, then the control is operable for reducing the actual inducer motor speed by using the switching device with a higher firing angle to thereby obtain a lower stator voltage for the inducer motor;
wherein if the control determines that the actual inducer motor speed is not greater than the sum of the set speed plus the first delta speed, then the control is operable for determining whether the actual inducer motor speed is less than a difference of the set speed minus a third delta speed.