Variable reluctance linear servomotor

Abstract

Abstract The invention relates to a variable-reluctance linear servomotor. The motor comprises an electromagnet formed by a shell (1) and by a coiling (11) around a displacement path, a magnetic part (17) mobile in the direction of displacement and guided mechanically so as to have a single degree of freedom with respect to the shell (1), under the effect of the force exerted by the electromagnet. A detector circuit (3) is formed by a sensor for inductive or capacitive measurement of the instantaneous value of the gap (18) and delivers a signal sd representing the displacement of the mobile magnetic part (17). The subtracter circuit (4) receives a displacement control signal e and the signal sd representing the displacement in order to deliver an error signal epsilon of displacement of the mobile magnetic part (17). A current-amplifier circuit CAC receives the error signal epsilon and delivers a supply current to the coiling (11). An element restoring the mobile magnetic part exerts a restoring force on the latter, opposite to the force exerted by the electromagnet. The restoring element (28) can be mechanical or consist of a counter-electromagnet. Application to the production of variable-reluctance linear motors for compensating for periodic vibrations of machines or for producing transducers for sound vibrations. <IMAGE>

Inventors

• 👤 André Gennesseaux

Bibliographic Details