Speed or angular position electromagnetic transducer

Details Speed or angular position electromagnetic transducer Speed or angular position electromagnetic transducer

1974-06-05

1976-03-02

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310168, 310111, 324174, H02K 2138

Patent

active

039420450

ABSTRACT:
An electromagnetic angular speed or angular position transducer comprises a permanent magnet with closely spaced pole faces and a ferromagnetic core magnetically connected to the magnet and carrying a coil. The transducer cooperates with a toothed wheel the teeth of which are moved past the pole faces and the core in such a way that two magnetic circuits are completed by the teeth, one passing through the teeth and the two pole faces, and the other passing through the teeth and the core. The two magnetic circuits are in parallel with one another and the reluctance of each changes as the teeth move therepast. The circuit through the two pole faces ensures that the magnet is operated with a high leakage flux so that small changes in the reluctance cause relatively large flux changes and thus a relatively high electromotive force in the coil wound about the core.

REFERENCES:
patent: 2419301 (1947-04-01), Tragesser
patent: 3492518 (1970-01-01), Wayne
patent: 3531671 (1970-09-01), Hohne
patent: 3681630 (1972-08-01), Sutton

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