US 11,657,943 B2
Ballistic unipolar bistable actuator
Guillaume Loussert, Moirans (FR); and Stéphane Biwersi, Frambouhans (FR)
Assigned to Moving Magnet Technologies, Besançon (FR)
Appl. No. 17/285,054
Filed by Moving Magnet Technologies, Besançon (FR)
PCT Filed Oct. 16, 2019, PCT No. PCT/FR2019/052441
§ 371(c)(1), (2) Date Apr. 13, 2021,
PCT Pub. No. WO2020/084220, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 1859948 (FR), filed on Oct. 26, 2018.
Prior Publication US 2022/0005639 A1, Jan. 6, 2022
Int. Cl. H01F 7/122 (2006.01); H01F 1/14 (2006.01); H01F 7/14 (2006.01); H01F 7/16 (2006.01); H01F 7/18 (2006.01)
CPC H01F 7/122 (2013.01) [H01F 1/14 (2013.01); H01F 7/14 (2013.01); H01F 7/1615 (2013.01); H01F 7/1872 (2013.01); H01F 2007/1669 (2013.01); H01F 2007/1692 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An actuator for controlling the movement of a ferromagnetic mobile mass between two stable positions, comprising:
the ferromagnetic mobile mass;
a stator comprising at least one wire coil fixed with respect to the mobile mass;
at least two ferromagnetic poles fixed with respect to the mobile mass on either side of the mobile mass;
at least one permanent magnet located and configured to attract the mobile mass to each of the two stable positions; and
an electronic control circuit configured to deliver pulsed electric current to the wire coil to control movement of the mobile mass from each stable position to the other stable position of the two stable positions;
wherein the mobile mass defines, with the ferromagnetic poles, at least two variable air gaps during the movement of the mobile mass;
wherein the electronic control circuit is configured to operate with no change in polarity to generate a magnetic flux in a single direction in the wire coil; and
wherein the mobile mass, the at least one wire coil, the ferromagnetic poles and the at least one magnet constitute a magnetic circuit in which magnetic flux of the permanent magnet opposes the magnetic flux generated by the at least one wire coil regardless of a position of the mobile mass.