US 11,923,736 B2
Electric machine with device for forcibly demagnetising permanent magnets
Camel Serghine, Moissy-Cramayel (FR); Thomas Klonowski, Moissy-Cramayel (FR); and Loïs Pierre Denis Vive, Moissy-Cramayel (FR)
Assigned to SAFRAN HELICOPTER ENGINES, Bordes (FR)
Appl. No. 17/416,867
Filed by SAFRAN HELICOPTER ENGINES
PCT Filed Dec. 19, 2019, PCT No. PCT/FR2019/053183
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/128348, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 1873641 (FR), filed on Dec. 20, 2018.
Prior Publication US 2022/0085706 A1, Mar. 17, 2022
Int. Cl. H02K 21/02 (2006.01); B64D 27/24 (2006.01); H02K 1/17 (2006.01); H02K 1/27 (2022.01); H02K 9/00 (2006.01)
CPC H02K 21/028 (2013.01) [B64D 27/24 (2013.01); H02K 1/17 (2013.01); H02K 1/27 (2013.01); H02K 9/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electric machine for an aircraft, the electric machine comprising:
a stator and a rotor rotatable with respect to the stator, the rotor or the stator comprising a plurality of permanent magnets;
a demagnetizing device that is configured to demagnetize at least one permanent magnet of the plurality of permanent magnets to implement a temporary temperature increase of the at least one permanent magnet in order to limit an exciter magnetic flux generated by the at least one permanent magnet during the temporary temperature increase;
a winding arranged so that an induced electrical current circulates in the winding under the influence of an exciter magnetic flux produced by the at least one permanent magnet during the rotation of the rotor; and
a winding fault sensor,
wherein the demagnetization device generates the temporary temperature increase of the at least one permanent magnet when a winding fault is detected by the winding fault sensor.