US 12,395,103 B2
Standstill angle detection for salient motors
Joseph Wilson Latham, Louisville, KY (US)
Assigned to Haier US Appliance Solutions, Inc., Wilmington, DE (US)
Filed by Haier US Appliance Solutions, Inc., Wilmington, DE (US)
Filed on Mar. 21, 2023, as Appl. No. 18/187,404.
Prior Publication US 2024/0322717 A1, Sep. 26, 2024
Int. Cl. H02P 6/18 (2016.01); H02P 21/18 (2016.01)
CPC H02P 6/183 (2013.01) [H02P 21/18 (2016.02); H02P 2203/03 (2013.01); H02P 2203/11 (2013.01)] 20 Claims
OG exemplary drawing
 
11. A motor assembly for an appliance, comprising:
a motor comprising at least a rotor and a stator;
a motor drive;
a sensorless feedback system configured to determine an orientation of the rotor based at least in part on one or more electrical characteristics of the stator; and
a controller operably coupled with the sensorless feedback system, the controller configured to:
determine a first estimated injection angle of a series of estimated injection angles;
inject a first high-frequency signal into the motor at the first estimated injection angle to provide a first high-frequency signal injection of a series of high-frequency signal injections;
process one or more signals associated with the first high-frequency signal injection;
determine a second estimated injection angle of the series of estimated injection angles based at least in part on the one or more signals associated with the first high-frequency signal injection;
inject a second high-frequency signal into the motor at the second estimated injection angle to provide a second high-frequency signal injection of the series of high-frequency signal injections;
process one or more signals associated with the second high-frequency signal injection;
determine a third estimated injection angle of the series of estimated injection angles based at least in part on the one or more signals associated with the first high-frequency signal injection and the one or more signals associated with the second high-frequency signal injection;
inject a third high-frequency signal into the motor at the third estimated injection angle to provide a third high-frequency signal injection of the series of high-frequency signal injections;
process one or more signals associated with the third high-frequency signal injection; and
determine one or more operating parameters based at least in part on the first high-frequency signal injection, the second high-frequency signal injection, and the third high-frequency signal injection.