US 11,988,152 B2
Turbomachine comprising an electric machine having a starter-generator function, and method for controlling the speed of such an electric machine
Huguette De Wergifosse, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 17/618,684
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Jul. 16, 2020, PCT No. PCT/FR2020/051292
§ 371(c)(1), (2) Date Dec. 13, 2021,
PCT Pub. No. WO2021/019144, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 1908561 (FR), filed on Jul. 26, 2019.
Prior Publication US 2022/0243663 A1, Aug. 4, 2022
Int. Cl. F02C 7/36 (2006.01); F02C 7/268 (2006.01); F16H 57/08 (2006.01)
CPC F02C 7/36 (2013.01) [F02C 7/268 (2013.01); F16H 57/082 (2013.01); F05D 2220/7644 (2013.01); F05D 2240/60 (2013.01); F05D 2260/40311 (2013.01); F05D 2270/023 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A turbomachine for an aircraft, comprising:
an accessory gear box,
a first electric machine,
a starter-generator integrating a second electric machine configured to operate in starter mode and in a generator mode, said first electric machine and said starter-generator integrating the second electric machine being arranged to transfer electrical power from one to the other,
control electronic means configured to control said first electric machine and the starter-generator integrating the second electric machine, by controlling the electrical power and a frequency of a current sent to said first electric machine and the starter-generator integrating the second electric machine, and
an epicyclic reduction gear train comprising three elements, a central planetary gear, an external ring gear and a planet carrier whose planet gears mesh with said planetary gear and said external ring gear, said three elements being rotatable about an axis of the epicyclic reduction gear train, a first of said three elements being intended to be coupled to the accessory gear box, a second of said three elements being intended to be coupled to the starter-generator integrating the second electric machine, a third of said three elements being driven in rotation by said first electric machine,
wherein said control electronic means are configured to modify a speed of rotation of the first electric machine and a speed of rotation of the starter-generator integrating the second electric machine to provide the starter-generator in the starter mode with a maximum torque, and
wherein said control electronic means are configured to modify the speed of rotation of the first electric machine so that said starter-generator in the generator mode is driven in rotation at a constant speed.