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US 9,076,621 B2Granted
Electromagnetic actuator with under voltage release
AssigneeEaton Industries (Netherlands) B.V.
InventorArend Lammers
Life of this patent
Estimating the term…
Abstract
An electromagnetic actuator has a yoke for guiding a magnetic flux, and a holding plate attached to an actuating member, the holding plate and yoke forming a first magnetic circuit. Furthermore a magnetic flux generation device is provided for generating a magnetic flux in the first magnetic circuit. The magnetic flux generation device has an under voltage release coil electrically connected to an auxiliary voltage source representing the value of a voltage to be monitored.
Claims6
An electromagnetic actuator, comprising:
- a yoke configured to guide a magnetic flux;
- a holding plate attached to an actuating member, the holding plate and yoke forming a first magnetic circuit;
- a pre-tensioning device which exerts a pre-tension force on the holding plate away from the yoke, the pre-tensioning device comprising a device external to the electromagnetic actuator;
- a magnetic flux generation device configured to generate a magnetic flux in the first magnetic circuit, the magnetic flux generation device comprising an under voltage release coil electrically connected to an auxiliary voltage source,
- the auxiliary voltage source supplying a voltage value to be monitored, and the under voltage release coil being dimensioned to generate an attraction force holding the holding plate against the yoke;
- a tripping coil, the under voltage release coil being able to generate a magnetic flux in the first magnetic circuit opposing a magnetic flux generated by the tripping coil;
- and
- a closing coil configured to generate a magnetic flux in a second magnetic circuit, the second magnetic circuit being separate from the first magnetic circuit;
- wherein the attraction force exceeds the pre-tension force when the auxiliary voltage exceeds a predetermined threshold value.
6 more elements
A switch gear installation, comprising:
- an auxiliary voltage supply which provides a voltage representing a main voltage of the switch gear installation;
- and
- an electromagnetic actuator including:
- a yoke configured to guide a magnetic flux;
- a holding plate attached to an actuating member, the holding plate and yoke forming a first magnetic circuit;
- a pre-tensioning device which exerts a pre-tension force on the holding plate away from the yoke, the pre-tensioning device comprising a device external to the electromagnetic actuator;
- a magnetic flux generation device configured to generate a magnetic flux in the first magnetic circuit, the magnetic flux generation device comprising an under voltage release coil electrically connected to an auxiliary voltage source,
- the auxiliary voltage source supplying a voltage value to be monitored, and the under voltage release coil being dimensioned to generate an attraction force holding the holding plate against the yoke;
- a tripping coil, the under voltage release coil being able to generate a magnetic flux in the first magnetic circuit opposing a magnetic flux generated by the tripping coil;
- and
- a closing coil configured to generate a magnetic flux in a second magnetic circuit, the second magnetic circuit being separate from the first magnetic circuit;
- wherein the attraction force exceeds the pre-tension force when the auxiliary voltage exceeds a predetermined threshold value.
9 more elements
Dependencies are inferred from the claim text.