US 12,266,469 B2
Autotransformer, autotransformer-rectifier unit and method for connecting a piece of electrical equipment to a three-phase grid by means of an autotransformer-rectifier unit
Rémy Biaujaud, Moissy-cramayel (FR)
Assigned to SAFRAN, Paris (FR)
Appl. No. 17/998,282
Filed by SAFRAN, Paris (FR)
PCT Filed May 12, 2021, PCT No. PCT/FR2021/050837
§ 371(c)(1), (2) Date Nov. 9, 2022,
PCT Pub. No. WO2021/229190, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2004854 (FR), filed on May 15, 2020.
Prior Publication US 2023/0274877 A1, Aug. 31, 2023
Int. Cl. H01F 30/02 (2006.01); H01F 30/12 (2006.01); H02M 5/14 (2006.01)
CPC H01F 30/02 (2013.01) [H01F 30/12 (2013.01); H02M 5/14 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A three-phase autotransformer including three inputs, three output groups and a plurality of windings distributed into three winding groups, the windings of a same winding group being magnetically coupled to each other, each winding group being associated with a respective phase, wherein
each output group comprises five outputs comprising a main output and four auxiliary outputs,
each input being associated with each of the outputs of a corresponding output group,
each input being connected to each of the corresponding outputs through a respective electrical path comprising at least one winding, and
for each input, the electrical path between said input and a corresponding output on the one hand, and the electrical path between the input and any other output of the same output group on the other hand, comprise at least one distinct winding,
the windings being configured so that, when each input has a respective input voltage applied thereto, the three input voltages having the same input amplitude, being 120° out of phase with each other and defining a neutral point:
for each output group, a main output voltage, taken equal to a voltage between the corresponding main output and the neutral point, has an amplitude, forming a main output amplitude, greater than the input amplitude; and
all output voltages of the autotransformer belong to a same Reuleaux polygon in a Fresnel diagram, each output voltage being associated with a respective output and being equal to a voltage between said output and the neutral point.