CONTROL SOLENOID WITH IMPROVED MAGNETIC CIRCUIT

摘要

An electromagnetic solenoid having a coil wound around a bobbin between first and second flanges for generating a magnetic force is disclosed. An armature having an armature flange at a first end is within an interior portion of the tubular center section of the bobbin and is supported for axial displacement between a first position and a second position. A permanent ring magnet is placed at the first end flange with an inner radial face spaced apart from an outer radial face of the armature flange by a radial gap, with the ring magnet supported by a retainer adjacent to the first end flange and fixed against axial displacement with respect to the bobbin. The solenoid comprises an outer case having a closed bottom at a first end and an open top at a second end and a flux washer disposed in the open top adjacent to a second end of the armature.

主权项

1. An electromagnetic solenoid comprising:
a coil for generating a magnetic force when energized with an electric current; a bobbin having a tubular center section and first and second end flanges between which the coil is wound; an armature having an armature flange at a first end, the armature disposed at least partially within an interior portion of the tubular center section and supported for axial displacement between a first position and a second position; a permanent ring magnet disposed at the first end flange with an inner radial face radially spaced apart from an outer radial face of the armature flange by a radial gap, the ring magnet supported by a retainer adjacent to the first end flange and fixed against axial displacement with respect to the bobbin; an outer case having a closed bottom at a first end and an open top at a second end; and a flux washer disposed in the open top adjacent to a second end of the armature.