Apparatus for generating a pulse when a first member passes a se

Details Apparatus for generating a pulse when a first member passes a se Apparatus for generating a pulse when a first member passes a se

1979-04-17

1980-08-12

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310168, H02K 2138

Patent

active

042175127

ABSTRACT:
A Wiegand wire is placed within the magnetic field generated by a first and second permanent magnet. The first permanent magnet has a field strength exceeding that of the second permanent magnet and the polarity of its magnetic field is opposite that of the second magnet. A rotor having segments of magnetic shielding alternating with slots is rotated between the Wiegand wire and the first magnet. When the magnetic shielding is between the first magnet and the Wiegand wire, the latter is exposed only to the magnetic field of the second permanent magnet. In a second position of the rotor, the Wiegand wire is exposed to both magnetic fields. Since the second permanent magnet generates a stronger field than the first, the direction of magnetization in the Wiegand wire changes abruptly causing a pulse to be generated in pick-up coil 4.

REFERENCES:
patent: 3230407 (1966-01-01), Marsh, Jr.
patent: 3458741 (1969-07-01), Woodward
patent: 3780313 (1973-12-01), Wiegand
patent: 3969644 (1976-07-01), Nowak
patent: 3983430 (1976-09-01), Howard
patent: 4157482 (1979-06-01), Kakinuma

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