Transducer for alternating current limiter
AssigneeSprecher & Schuh AG
InventorAlex Blum
Life of this patent
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Abstract
The transducer comprises an armature and a core. Both pieces are E-shaped, and their geometrical dimensions are chosen so that when their central legs come into mutual contact, air gaps still exist between both pairs of outer legs where these face each other. A coil bobbin is fixed to the core and forms a straight guide for the central leg of the armature. The frontal surfaces of the outer legs are chamfered so that the limiting surfaces of the air gaps are inclined with respect to the travel direction of the armature. In order to minimize the hum, a short-circuit ring is embedded into the central leg of the core.
Claims7
An electromechanical transducer for a limiter switch for alternating current, comprising a coil-supporting bobbin and a pair of magnetic pieces forming an armature and a core, at least one of the armature and core being E-shaped, a central leg of said E-shaped piece coming into contact with the other piece when said transducer is activated, at least one of said central leg and the region of the other piece which faces said central leg carrying a short-circuit ring, the pieces being configured so that in an activated state air gaps exist between both pairs of outer legs of the magnetic pieces, surfaces of the pieces which define the gaps being slanted with respect to a travel direction of the armature.
Dependencies are inferred from the claim text.