US 11,892,525 B2
Magnetic sensing system for multiple door appliances
Todd Sabotta, Chicago, IL (US); Seong-Jae Lee, Chicago, IL (US); and Stephen E. Knapp, Chicago, IL (US)
Assigned to Littelfuse, Inc., Chicago, IL (US)
Filed by Littelfuse, Inc., Chicago, IL (US)
Filed on May 26, 2022, as Appl. No. 17/825,450.
Claims priority of provisional application 63/271,827, filed on Oct. 26, 2021.
Prior Publication US 2023/0127677 A1, Apr. 27, 2023
Int. Cl. G01R 33/09 (2006.01); F25D 23/02 (2006.01); G01R 33/07 (2006.01)
CPC G01R 33/091 (2013.01) [F25D 23/028 (2013.01); G01R 33/072 (2013.01); G01R 33/093 (2013.01); G01R 33/096 (2013.01); G01R 33/098 (2013.01); F25D 2700/02 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A magnetic sensing system comprising:
a sensor disposed within a housing of an appliance, wherein the appliance includes a first moving component, a second moving component, and a third moving component;
a first magnet disposed in a first orientation adjacent the first moving component, a first position of the first magnet to change in concert with movement of the first moving component;
a second magnet disposed in a second orientation adjacent the second moving component, a second position of the second magnet to change in concert with movement of the second moving component; and
a third magnet disposed in a third orientation adjacent the third moving component, a third position of the third magnet to change in concert with movement of the third moving component;
wherein the sensor detects displacement of the first moving component, the second moving component, or the third moving component;
wherein the first magnetic field strength is twice the second magnetic field strength, and the second magnetic field strength is twice the third magnetic field strength.