Electromagnetic system
AssigneeElmeg Elektro-Mechanik GmbH
InventorsHans-Werner Reuting, Hugo Eggers
Life of this patent
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Abstract
A system for a relay is disclosed having a permanent magnet for bias and electromagnetic energization for changing the disposition of an armature. A magnetic shunt path is provided for the permanent magnet serving as a basic load on the magnet, in that the magnetic resistance of magnet plus parallel shunt is lower than the resistance of the remainder of the magnetic circuit. The shunt has preferably resistance that declines with field strength and the flux at the work point (external excitation zero) plus field as set up by the magnet times its permeability should exceed 6000 Gauss.
Claims14
In an electromagnet system having a permanent magnet means for energization, further having a magnetically superimposing electromagnetic energization and a magnetizable output, all being included in a magnetic circuit, the improvement for preventing weakening of the permanent magnet means comprising:
- a magnet shunt path for the permanent magnet means included in the circuit and connected in parallel thereto and having width dimensions so that the internal magnetic resistance of the shunt and of the permanent magnet means combined is smaller than the sum total of the magnetic resistance of the remainder of the magnetic circuit, the permanent magnet means having a particular demagnetization curve and the shunt having a particular magnetic load characteristics resulting in a point of intersection defined by a flux Bo and a magnetic field strength Ho, said permanent magnet means having a permeability .mu. so that Bo + .mu. Ho exceeds 8000 Gauss.
In an electromagnet system having a permanent magnet for energization and being included in a magnetic circuit which includes means for providing electromagnetic energization, further including yoke elements for magnetic conduction, the improvement of a magnetically conductive block, the permanent magnet being inserted in the block, so that the poles of the permanent magnet are in engagement with opposite ends of the block, portions of the block extending from the opposite ends alongside of said magnet and along opposite sides thereof, the block being interposed between the yoke elements whereby said ends respectively adjoin said yoke elements and serving as a shunt element, whereby the combined magnetic resistance of the shunt element and of the permanent magnet is lower than the sum total of the magnetic resistances of the remainder of the magnetic circuit.
Dependencies are inferred from the claim text.