US 11,863,091 B2
Motor voltage synthesis in reduced voltage soft starters and motor starters employing the same
Stan Rex Simms, Arden, NC (US)
Assigned to Eaton Intelligent Power Limited, Dublin (IE)
Filed by Eaton Intelligent Power Limited, Dublin (IE)
Filed on Apr. 8, 2022, as Appl. No. 17/658,509.
Prior Publication US 2023/0327593 A1, Oct. 12, 2023
Int. Cl. H02P 21/34 (2016.01); H02P 21/22 (2016.01); H02P 21/20 (2016.01)
CPC H02P 21/34 (2016.02) [H02P 21/20 (2016.02); H02P 21/22 (2016.02); H02P 2207/01 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of operating a reduced voltage soft starter (RVSS) that drives a motor, the method comprising:
sensing a line voltage provided to the RVSS to produce a first voltage signal;
sensing a current of the motor to generate a current signal;
transforming the first voltage signal according to an ABC-dq0 transformation at a first angle to generate a component signal;
scaling the component signal;
transforming the scaled component signal according to a dq0-ABC transformation at a second angle to generate load-side line-to-neutral voltage signals for respective phases; and
processing the load-side line-to-neutral voltage signals responsive to the current signal to compensate for switching by the RVSS.