Electromagnetic actuator equipped with means for adjusting its mobile polar element
First Claim
1. Electromagnetic accelerometer comprising a movable mass suspended from a peripheral frame, an electromagnetic actuator configured to compensate for displacements of the movable mass with respect to a reference position, the actuator comprising a stationary stator element associated with a movable polar element securable to the movable mass, the stationary stator element and the movable polar element forming a magnetic circuit and defining between them at least two gaps, a magnet helping to create magnetic field lines in the magnetic circuit, a coil for controlling the displacement of the movable polar element through electromagnetic induction phenomena, a position sensor detecting a position of the movable mass secured to the movable polar element, an adjustment polar element which cooperates with the stationary stator element so as to place the movable polar element in an adjusted position with respect to that of the stationary stator element, by deviating the magnetic field lines, placing the movable mass, in the absence of motion of the accelerometer, in the reference position.
1 Assignment
0 Petitions
Accused Products
Abstract
An electromagnetic accelerometer including a stationary stator element (12) associated with a movable polar element (14) securable to an external member (2), the stationary stator element (12) and the movable polar element (14) forming a magnetic circuit and defining between them at least two gaps (51), a magnet (5) helping to create magnetic field lines in the magnetic circuit, a coil (6) and a mechanism for energizing the coil for controlling the displacement of the movable polar element (14) through electromagnetic induction phenomena. The electromagnetic accelerometer further includes an adjustment polar element (15) for placing the movable polar element (14) in an adjusted position with respect to that of the stationary stator element (12), by deviating the magnetic field lines.
-
Citations
11 Claims
- 1. Electromagnetic accelerometer comprising a movable mass suspended from a peripheral frame, an electromagnetic actuator configured to compensate for displacements of the movable mass with respect to a reference position, the actuator comprising a stationary stator element associated with a movable polar element securable to the movable mass, the stationary stator element and the movable polar element forming a magnetic circuit and defining between them at least two gaps, a magnet helping to create magnetic field lines in the magnetic circuit, a coil for controlling the displacement of the movable polar element through electromagnetic induction phenomena, a position sensor detecting a position of the movable mass secured to the movable polar element, an adjustment polar element which cooperates with the stationary stator element so as to place the movable polar element in an adjusted position with respect to that of the stationary stator element, by deviating the magnetic field lines, placing the movable mass, in the absence of motion of the accelerometer, in the reference position.
-
11. Process for adjusting a position of a movable polar element of an electromagnetic accelerometer, the movable polar element being securable to a movable mass, the accelerometer comprising a stationary stator element associated with the movable polar element, the stationary stator element and the movable polar element forming a magnetic circuit and defining between them at least two gaps, a magnet helping to create magnetic field lines in the magnetic circuit, a coil for controlling displacement of the movable polar element through electromagnetic induction phenomena, comprising the following steps:
-
placement of the movable polar element in an initial position with respect to the stationary stator element, orientation of the electromagnetic actuator such that a displacement of the movable polar element can occur substantially perpendicularly to gravity, engagement into an opening of the stationary stator element of a polar element for adjusting a position of the movable polar element with respect to that of the stationary stator element, the engagement, by deviating the magnetic field lines, causing a displacement of the movable polar element until the movable polar element has reached a desired adjusted position, the desired adjusted position being detected by the strain gauges, the movable polar element being, in the initial position, nearer to the opening than in the desired adjusted position.
-
Specification