Abstract: The motion of the magnetized movable masses of a bilinear electrodynamic motor comprising two movable masses moving in opposite senses parallel to the axis (x-x) of the motor is balanced. At least one first magnetic sensor and at least one second magnetic sensor are provided which are able to deliver respectively a first electrical signal (s1(t)) and a second electrical signal (s2(t)) respectively representative of the motion of a first and of a second movable mass. An error signal (?s(t)) equal to the difference between the said first (s1(t)) and second (s2(t)) electrical signals is recorded. A harmonic analysis of the error signal performed. A sinusoidal excitation signal (e1(t)) at a given frequency f0 is applied to the first movable mass.

Abstract: The invention relates to a method for absorbing the displacement, under the influence of an external force, of at least one plunger (10,20) in a linear electrodynamic motor comprising a least an induction coil (11, 21) magnetically coupled with the plunger. Said method comprises the steps of: detecting in said induction coil a current induced (I?ind) amplified relative to the induced current. The invention can be applied to cryogenic machines on board space ships.

Abstract: Method for balancing the motion of the magnetized movable masses of a bilinear electrodynamic motor comprising two movable masses moving in opposite senses parallel to the axis (x-x) of the motor, characterized in that the said method comprises the steps of: providing at least one first magnetic sensor and at least one second magnetic sensor which are able to deliver respectively a first electrical signal (s1(t)) and a second electrical signal (s2(t)) respectively representative of the motion of a first and of a second movable mass, recording an error signal (?s(t)) equal to the difference between the said first (s1(t)) and second (s2(t)) electrical signals and performing a harmonic analysis of the said error signal, applying a sinusoidal excitation signal (e1(t)) at a given frequency f0 to the first movable mass, iteratively applying N successive excitation signals (e2n(t)) to the second movable mass, an excitation signal of rank n (0?n?N?1) being equal to a Fourier series of order n of fundamental freque

Abstract: The invention relates to a method for absorbing the displacement, under the influence of an external force, of at least one plunger (10,20) in a linear electrodynamic motor comprising a least an induction coil (11, 21) magnetically coupled with the plunger. Said method comprises the steps of: detecting in said induction coil a current induced (I?ind) amplified relative to the induced current. The invention can be applied to cryogenic machines on board space ships.

Abstract: The invention concerns a thermal switch, characterized in that said switch comprises a thermal connection element consisting of an integral single part forming a body of thermally conductive homogeneous composition as well as an actuator for opening said switch by mechanical rupture of said thermal connection element.