Inner magnet type movable coil instrument with linear scale

Details Inner magnet type movable coil instrument with linear scale Inner magnet type movable coil instrument with linear scale

1977-03-28

1979-02-13

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With permanent magnet

324132, G01R 506, G01R 116

Patent

active

041398211

ABSTRACT:
An inner magnet type movable coil instrument comprises a cylindrical permanent magnet magnetized to axis-symmetrically form a pair of opposite magnetic poles in a direction to the axis of the magnet; a pair of arcuate magnetic plates made of soft iron and bonded to the opposite side surfaces of the cylindrical permanent magnet with each magnetic pole located at a central line of the magnetic plate; a semicylindrical yoke made of soft iron and secured to one side surface on which it intersects orthogonal to the opposite magnetic poles, said yoke being arranged coaxial with the permanent magent and having sections inclined in the same direction to the axis of the yoke and confronting the magnetic poles of the permanent magnet; a movable coil rotatable coaxially of the permanent magnet and in a gap between the permanent magnet and the yoke; upper and lower bearing members formed integral with the yoke and journalizing the movable coil therein; control spring means mounted on the movable coil; and a pointer.

REFERENCES:
patent: 2183685 (1939-12-01), Lingg
patent: 2260026 (1941-10-01), Hoare
patent: 2610989 (1952-09-01), Wiese et al.
patent: 2940045 (1960-06-01), Ammon
patent: 3130365 (1964-04-01), Minter
patent: 3273061 (1966-09-01), Rumpelein et al.
patent: 3602815 (1971-08-01), Rumpelein et al.
patent: 3711776 (1973-01-01), Inami et al.

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