Electromagnetic having magnetic shield

Details Electromagnetic having magnetic shield Electromagnetic having magnetic shield

1990-10-30

1991-08-06

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324318, H01F 700

Patent

active

050381296

ABSTRACT:
An electromagnet having a magnetic shield, in which dummy holes generally equal in shape to a hole conventionally provided for a service port are formed in a pair of end plates of a magnetic shield. The holes formed in each of the end plates are in equal radial-direction positions and are arranged in the circumferential direction at equal angular intervals, and the positions of the holes formed on the two end plates are symmetric on the center point of the electromagnet and/or the plane containing the center point and perpendicular to the center axis. Portions of the end plates in the vicinity of the holes are increased in thickness to compensate for the loss of the magnetic material due to the formation of the holes.

REFERENCES:
patent: 4800355 (1989-01-01), Takechi et al.
patent: 4942379 (1990-07-01), Ogawa et al.

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