Magnetic encoder with composite magnet

Details Magnetic encoder with composite magnet Magnetic encoder with composite magnet

1992-11-25

1994-05-17

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

310156, 324174, 335306, 341 15, G01B 730, G01P 3487, H01F 702, H03M 100

Patent

active

053131592

ABSTRACT:
The composite magnet of the present invention comprises two pieces of permanent magnet material formed into a complementary pattern of holes and projections. The two pieces are magnetized in opposite axial directions. The two pieces, magnetized in this manner, when placed together form an interlocking single element which exhibits a magnetic pattern of north-south poles which matches the pattern of holes and projections. In this manner, the composite magnet appears as a single permanent magnet, exhibiting a sharp, strong, and well-defined magnetic pattern. In accordance with the present invention, the composite magnet may be used in many applications including, but not limited to encoders, one of which is described in detail.

REFERENCES:
patent: 2615227 (1952-10-01), Hornik
patent: 3317829 (1967-05-01), Kuhrt et al.
patent: 3558941 (1971-01-01), Brebbia et al.
patent: 3633138 (1972-01-01), Baermann
patent: 3742243 (1973-06-01), Gamble
patent: 4086519 (1978-04-01), Persson
patent: 4274053 (1981-06-01), Ito et al.
patent: 4399595 (1983-08-01), Yoon et al.
patent: 4499420 (1985-02-01), Shiraki et al.
patent: 4528473 (1985-07-01), Tezuka
patent: 4642496 (1987-02-01), Kerviel et al.
patent: 4941236 (1990-07-01), Sherman et al.
Clark, G.A.; Rotary Tachometer/Encoder, IBM Tech. Disc. Bull. vol. 18 No. 9 Feb. 1976, p. 2787.

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