Magnetic transducer

Details Magnetic transducer Magnetic transducer

1979-11-27

1985-03-05

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310168, H02K 2138

Patent

active

045033480

ABSTRACT:
An electromagnetic transducer which generates signals on the basis of the Barkhausen effect under periodically alternating externally applied magnetic switching fields. Prior to use, the magnetic sensor element, for example a ferromagnetic wire, is pre-magnetized by undergoing a program which subjects the wire to a coercive applied field substantially higher than the alternating interrogation field. The coercive field places different zones of the wire into magnetic saturation with varying relative polarity, thereby creating two or more zones of different magnetization. When subjected to the alternating, low intensity interrogation field, sensor coils detect a high level, bipolar output signal.

REFERENCES:
patent: 3431444 (1969-03-01), Wilson
patent: 3866193 (1975-02-01), Wiegand
patent: 3983430 (1976-09-01), Howard
patent: 4150314 (1979-04-01), Zabler et al.
patent: 4217512 (1980-08-01), Hauler et al.
patent: 4247601 (1981-01-01), Wiegand

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