US 11,686,511 B2
Motor temperature control technique with temperature override
Curtis Christian Crane, York, PA (US)
Assigned to Johnson Controls Tyco IP Holdings LLP, Milwaukee, WI (US)
Filed by Johnson Controls Technology Company, Auburn Hills, MI (US)
Filed on Aug. 24, 2020, as Appl. No. 17/717.
Application 17/000,717 is a continuation of application No. 16/234,549, filed on Dec. 27, 2018, granted, now 10,782,057.
Claims priority of provisional application 62/611,672, filed on Dec. 29, 2017.
Prior Publication US 2020/0386460 A1, Dec. 10, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. F25B 31/00 (2006.01); H02K 11/35 (2016.01); H02K 7/09 (2006.01); F25B 49/02 (2006.01); H02K 7/08 (2006.01); F25B 41/20 (2021.01); H02K 11/25 (2016.01); H02P 29/64 (2016.01); F25B 25/00 (2006.01)
CPC F25B 31/008 (2013.01) [F25B 31/006 (2013.01); F25B 41/20 (2021.01); F25B 49/02 (2013.01); F25B 49/022 (2013.01); F25B 49/025 (2013.01); H02K 7/083 (2013.01); H02K 7/09 (2013.01); H02K 11/25 (2016.01); H02K 11/35 (2016.01); H02P 29/64 (2016.02); F25B 25/005 (2013.01); F25B 2339/047 (2013.01); F25B 2500/08 (2013.01); F25B 2600/2515 (2013.01); F25B 2700/21157 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A chiller system, comprising:
a refrigeration circuit having a compressor and a condenser;
a motor configured to drive the compressor;
a temperature sensor configured to provide a temperature of the motor;
a conduit fluidly coupling the motor and the condenser to facilitate refrigerant flow between the condenser and the motor to cool the motor, wherein the conduit comprises a motor cooling valve configured to transition between an open configuration and a closed configuration to regulate an amount of the refrigerant flow between the condenser and the motor;
a motor temperature control system configured to adjust the motor cooling valve to control the temperature of the motor based on a temperature set point, a first temperature threshold, and a second temperature threshold that is lower than the first temperature threshold, wherein the motor temperature control system is configured to:
alternate the motor cooling valve between the open configuration and the closed configuration based on an open command and a close command; and
override and proportionally limit the close command based on the temperature of the motor exceeding the second temperature threshold to limit transition of the motor cooling valve toward the closed configuration.