Polarized electromagnet

H - Electricity – 01 – H

Patent

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306/51

H01H 51/22 (2006.01) H01F 7/16 (2006.01)

Patent

CA 1293010

ABSTRACT A polarized electromagnet with improved response sensitivity includes an axially movable core extending through an excitation coil to be movable between two positions upon energization and deenergization of the coil . The core is formed at its opposite ends respectively with pole plates extending transversely of the core axis. Inner and outer yokes and are arranged in parallel to the core and are magnetized to the opposite polarities by a permanent magnet . Inner and outer yokes and have at respective ends inner and outer pole ends and which are spaced axially to each other so as to form therebetween magnetic gaps in each of which the adjacent one of the pole plates is located. At least one of the inner pole ends terminates in a pole tip which is positioned transversely outwardly of the adjacent pole plate and extends in the axial direction to a point where it overlies the adjacent pole plate when the latter is magnetically attracted to the pole tip such that the inward face of the pole tip comes into direct facing relation to the lateral edge of the adjacent pole plate when the pole plate is attracted to the pole tip . Accordingly, it is possible to reduce the physical gap or the magnetic resistance between the pole tip and the adjacent pole plate in the position away from the pole tip without reducing the stroke of the core in the axial direction.

581680

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