US 11,671,037 B1
Efficiency optimization of maximum torque per amps control for synchronous motors
Bing Li, Mequon, WI (US); and Brian J. Seibel, Mequon, WI (US)
Assigned to Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US)
Filed by Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US)
Filed on May 5, 2022, as Appl. No. 17/737,826.
Int. Cl. H02P 6/08 (2016.01); H02P 25/022 (2016.01)
CPC H02P 6/08 (2013.01) [H02P 25/022 (2013.01); H02P 2207/055 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
generating an offline Maximum Torque Per Amps (MTPA) curve based on an autotune test for a motor;
generating a search zone for the MTPA curve for a given torque point, the search zone comprising an upper D-axis reference current and a lower D-axis reference current for the given torque point, wherein the MTPA curve comprises torque points of torques for current pairs of a Q-axis current and a D-axis current for the motor;
iteratively modifying a D-axis reference current between the upper D-axis reference current and the lower D-axis reference current of the search zone;
modifying a Q-axis reference current to output the given torque; and
updating a corresponding current pair of the given torque point to the modified D-axis reference current and the modified Q-axis reference current with a lowest current amplitude to further improve the efficiency of the motor.