US 12,304,645 B2
Hybrid propulsion system and method for controlling such a system
Lois Pierre Denis Vive, Moissy-Cramayel (FR); Thomas Klonowski, Moissy-Cramayel (FR); and Camel Serghine, Moissy-Cramayel (FR)
Assigned to SAFRAN HELICOPTER ENGINES, Bordes (FR)
Appl. No. 17/601,816
Filed by SAFRAN HELICOPTER ENGINES, Bordes (FR)
PCT Filed Apr. 10, 2020, PCT No. PCT/FR2020/000116
§ 371(c)(1), (2) Date Oct. 6, 2021,
PCT Pub. No. WO2020/212656, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 1904034 (FR), filed on Apr. 16, 2019.
Prior Publication US 2022/0177147 A1, Jun. 9, 2022
Int. Cl. H02J 3/36 (2006.01); B64C 27/08 (2023.01); B64D 27/02 (2006.01); B64D 27/24 (2024.01)
CPC B64D 27/24 (2013.01) [B64C 27/08 (2013.01); H02J 3/36 (2013.01); B64D 27/026 (2024.01); B64D 2221/00 (2013.01); H02J 2310/44 (2020.01)] 14 Claims
OG exemplary drawing
 
1. A hybrid propulsion system for a multi-rotor rotary wing aircraft, comprising:
an internal combustion engine,
at least one electric machine coupled to the internal combustion engine so that in operation the internal combustion engine drives the at least one electric machine,
a rectifier connected to the electric machine and configured to convert an alternative current delivered from the electric machine into a direct current,
means for converting direct current into alternative current,
an electrical network connecting the rectifier to the conversion means,
electric motors connected to the means for converting so that in operation the conversion means supply the electric motors with alternative current,
propellers coupled to the electric motors so that in operation the electric motors drive the propellers,
wherein the system comprises:
detection means configured to detect a reduction in a demand for electrical power within the system below a predetermined value,
short-circuit means configured to short-circuit the at least one electric machine when the detection means detects a reduction in the demand for electrical power.