Electromagnet with a magnetic shield

Details Electromagnet with a magnetic shield Electromagnet with a magnetic shield

1989-01-19

1990-03-27

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335304, H01F 700

Patent

active

049124455

ABSTRACT:
An electromagnet comprising a magnetic field coil and a substantially cylindrical magnetic shield coaxially disposed around the field coil for defining a magnetic circuit therearound. The magnetic shield comprises a hollow cylindrical magnetic yoke with ring-shaped end plates at its opposite ends. The magnetic yoke's cylindrical wall has a cross-sectional area effective for accommodating the magnetic flux generated by the magnetic field coil. The magnetic yoke has a pair of thicker wall sections at first diametrically opposite positions, and a pair of thinner wall sections a second diametrically opposite positions separated by 90 degrees from the first diametrically opposite positions. The thicker and the thinner wall sections are thicker and thinner, respectively, than a mean required wall thickness which is a wall thickness necessary for providing to the magnetic yoke a cross-sectional area for effectively accommodating the magnetic flux generated by the magnetic field coil.

REFERENCES:
patent: 4590452 (1986-05-01), Ries et al.
patent: 4646046 (1987-02-01), Vavrek et al.
patent: 4673881 (1987-06-01), Ries et al.
patent: 4743880 (1988-05-01), Breneman et al.

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