US 12,413,065 B2
Motor disconnection detection while the motor is switched on
Palanivel Subramaniam, Richardson, TX (US); and Yan Yang, Wylie, TX (US)
Assigned to Lennox Industries Inc., Richardson, TX (US)
Filed by Lennox Industries Inc., Richardson, TX (US)
Filed on Jun. 26, 2023, as Appl. No. 18/340,963.
Prior Publication US 2024/0429699 A1, Dec. 26, 2024
Int. Cl. H02P 21/06 (2016.01); G01R 19/165 (2006.01); H02H 3/087 (2006.01)
CPC H02H 3/087 (2013.01) [G01R 19/16571 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for detecting motor disconnection while a motor is switched on, comprising:
a motor configured to operate a motor-driven component, wherein the motor is associated with a motor drive circuit that supplies power to the motor; and
a processor communicatively coupled to the motor drive circuit, and configured to:
determine whether a set of disconnection conditions is met for more than a threshold time, comprising:
determine that a pulse signal that leads to powering the motor is enabled;
determine that a modeled speed associated with the motor is more than a threshold speed, wherein the modeled speed determined is from a circuit model that represents the motor;
determine that a drive voltage output associated with the motor drive circuit is more than a threshold voltage;
determine that a current applied to the motor is less than a threshold current; and
determine that a speed associated with the motor is zero; and
in response to determining that the set of disconnection conditions is met for more than the threshold time, determine that at least one terminal of the motor is disconnected from the motor drive circuit.