Liaisons Electroniques-mecaniques Lem Sa

Lem Intellectual Property Sa

Lem International Sa

Liaisons Electroniques-mechaniques Lem S.a.

Liasons Electroniques-mecaniques Lem Sa

Gérard Lepine

Arnaud Labbe

Gilles Moret

Vinh Tho Vo

Olivier De Loriol

Thierry Didier Chenavard

Thierry Chevanard

Erick Pauchet

David Seron

Tho Vo Vinh

An electrical current transducer including a magnetic core and a magnetic field detector module, the magnetic core and magnetic field detector module each forming a single unit separably mountable around a primary conductor and to a circuit board, the magnetic core having a general U shape including an end branch and lateral branches extending the end branch to respective free ends, the magnetic field detector module being positioned between the lateral branches and extending across a whole width of a gap formed between the lateral branches. The magnetic field detector module includes at least one magnetic field sensing cell, a pair of magnetic concentrators arranged in mirror opposition forming a magnetic field gap therebetween in which the at least one sensing cell is positioned, and an insulating body supporting the magnetic concentrators and at least one sensing cell.

Current transducer with magnetic field detector module

An open loop electrical current transducer including a primary conductor bar, for carrying a current to be measured, a magnetic core having a U shape formed by an end branch and lateral branches upstanding therefrom to free ends, a magnetic circuit gap formed between inner surfaces of the lateral branches at the free ends of the lateral branches, a magnetic field detector positioned in the magnetic circuit gap, and a housing surrounding the magnetic core and a section of the primary conductor bar extending through the magnetic core and beyond the magnetic core either side thereof. The primary conductor bar includes a central portion having a width (Wc) equal to the width of a magnetic field gap (Wg) such that the central portion is clamped between said lateral branches in an interference force fit.

Current transducer with magnetic core on primary conductor bar

Battery current sensor comprising a battery post connection clamp portion () comprising a tubular clamping body configured to be clamped around a terminal post () of a battery (), and a current sensing portion () comprising a magnetic circuit () and a magnetic field sensor (). The magnetic circuit comprises a magnetic core surrounding the tubular clamping body ().

Battery current sensor having a magnetic field sensor

An electrical current transducer comprising a housing, at least one magnetic core comprising an air gap and defining a central passage configured to receive a primary conductor carrying a primary current to be measured through the central passage, a magnetic field detector positioned at least partially in the air gap, and a grounding element. A lateral surface of the magnetic core is positioned against the grounding element without direct fixed attachment between the magnetic core and the grounding element, and the grounding element overlaps the magnetic core to an extent configured to ensure that a capacitive coupling (C) between the magnetic core and the grounding element is greater than a capacitive coupling (C) between the magnetic core and the magnetic field detector.

Electrical current sensor with grounded magnetic core

Open-loop electrical current sensor () for measuring the electrical current flowing in a primary conductor, comprising a magnetic circuit () with an air-gap (), and a magnetic field sensing device () positioned at least partially in said air-gap. The magnetic field sensing device comprises a circuit board (), a first magnetic field detector () mounted on the circuit board, and a second magnetic field detector (). The second magnetic field detector comprises a conductive coil formed on the circuit board, the output signals of the first magnetic field detector and the second magnetic field detector being adapted for connection to a signal processing circuit () generating an output signal representative of the primary electrical current.

High bandwidth open-loop current sensor

A three-phase current sensor for measuring currents (I, I, I) running in three conductors of a three-phase conductor system comprises a first magnetic measuring device (D) and a second magnetic measuring device (D). Each magnetic measuring device comprises a magnetic circuit provided with at least two interleaf gaps and a magnetic field sensor arranged in each interleaf gap. The magnetic measuring devices (D, D) are positioned on both sides of a central conductor or cavity, thereby enabling a central conductor to be inserted in such a way that one of three phases of the conductor system is formed.

Three-phase current sensor

An electric current sensor having a housing, magnetic circuit with a magnetic core, and a magnetic field detector with a detection cell, positioned in an air gap between ends of the core. The core is made of a non-laminated magnetic material, and the magnetic circuit has a strap made of non-magnetic material welded to the core at each side of the air gap. The magnetic field detector has a support plate on which the detection cell is mounted. The plate has a recess, opposition the detection cell, which houses one end of the magnetic circuit.

Growing community of inventors

Peillonnex, France

Gérard Lepine