US 9,813,004 B2
Systems and methods concerning exciterless synchronous machines
Ghanshyam Shrestha, Raleigh, NC (US); Darren Tremelling, Raleigh, NC (US); Waqas Arshad, Raleigh, NC (US); Wen Ouyang, Raleigh, NC (US); and Jan Westerlund, Helsinki (FI)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Technology AG, Zurich (CH)
Filed on Jan. 16, 2015, as Appl. No. 14/598,926.
Prior Publication US 2016/0211787 A1, Jul. 21, 2016
Int. Cl. H02P 9/30 (2006.01); H02K 3/20 (2006.01); H02K 3/28 (2006.01); H02K 11/042 (2016.01); H02K 19/12 (2006.01)
CPC H02P 9/302 (2013.01) [H02K 3/28 (2013.01); H02K 11/042 (2013.01); H02K 19/12 (2013.01); H02K 3/20 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A system for operating a synchronous machine, comprising:
a first surface of the rotor and second surface of the stator separated by an air gap, the rotor including a field winding, a rotating DC power supply and an exciter winding disposed in the first surface of the rotor adjacent the air gap, the exciter winding electrically coupled to an input of the DC power supply and the field winding coupled to an output of the DC power supply; and
a converter electrically coupled to the stator, structured to transfer AC power including a fundamental frequency component between the converter and the stator, and including a harmonic injector,
wherein the harmonic injector is configured to determine a harmonic component based on a prescribed current level of the field winding,
wherein the harmonic injector is configured to selectively control the converter so as to add the harmonic component to the AC power transferred between the converter and the stator,
wherein the exciter winding is structured to receive the harmonic component of the AC power, and
wherein the DC power supply is structured to receive the harmonic component from the exciter winding, convert the harmonic component to DC power, and transmit the DC power to the field winding.