US 11,901,855 B2
Polyharmonic flux motor loss increase
Jacob Lamb, Mequon, WI (US); and Zhendong Zhang, 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 Jun. 17, 2021, as Appl. No. 17/350,090.
Prior Publication US 2022/0407439 A1, Dec. 22, 2022
Int. Cl. H02P 6/28 (2016.01); H02P 27/08 (2006.01)
CPC H02P 6/28 (2016.02) 17 Claims
OG exemplary drawing
 
1. A method comprising:
offsetting pulse width modulation (PWM) carriers to a motor to increase motor harmonics, wherein the offset PWM carriers increase energy losses for the motor; and
concurrently injecting a high-frequency signal into a motor control signal for the motor, wherein the high-frequency signal is a sine wave with a non-fundamental motor frequency, and wherein the high-frequency signal is a function of a motor frequency and the combination of increased motor harmonics and the high-frequency signal increases the energy losses for the motor.