L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

Thierry Trollier

Jonathan Buquet

Gerald Aigouy

Gérald Aigouy

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 (s(t)) and a second electrical signal (s(t)) respectively representative of the motion of a first and of a second movable mass. An error signal (&#x394;s(t)) equal to the difference between the said first (s(t)) and second (s(t)) electrical signals is recorded. A harmonic analysis of the error signal performed. A sinusoidal excitation signal (e(t)) at a given frequency fis applied to the first movable mass. N successive excitation signals (e(t)) are iteratively applied to the second movable mass, an excitation signal of rank n (0&#x2266;n&#x2266;N&#x2212;1) being equal to a Fourier series of order n of fundamental frequency f, the term of order n of the said series being adjusted in amplitude and in phase so as to minimize the component at the frequency n&#xb7;fof the error signal. The excitation signal (e(t)) of rank N&#x2212;1 is taken as excitation signal for the second movable mass.

Method for balancing the movement of mobile masses in a bi-linear electrodynamic motor

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

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Eybens, France

Thierry Trollier