Electrical transmission or interconnection systems – Nonlinear reactor systems – Magnetic pulse generator
Patent
1998-01-29
1999-04-27
Paladini, Albert W.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Magnetic pulse generator
360110, 360113, 360125, 2960301, G05B 5187
Patent
active
058982418
ABSTRACT:
A read head for a Wiegand wire has two C-shaped ferro-magnetic yokes in lateral alignment with one another, two magnets sandwiched between respective first and second legs-of the yokes, and a pickup coil wound on one of the legs of the read head. One magnet has a first polarity adjacent to the first leg of the first yoke, the other magnet has the first polarity adjacent to the second leg of the second yoke, and the reluctances of the two yokes are equal. When used in combination with a processor that processes the output pulses, a Wiegand token having one or more Wiegand wires therein may be detected by counting the number of output pulses of the read head and ascertaining the duration of time between occurrences of those pulses. Wiegand tokens having different values may have different numbers of Wiegand wires therein and/or different spacings between the Wiegand wires within the Wiegand token and, thus, the read head in combination with a processor can identify Wiegand tokens of different values.
REFERENCES:
patent: 3820090 (1974-06-01), Wiegand
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patent: 4047236 (1977-09-01), Lee
patent: 4097910 (1978-06-01), Lefevers et al.
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patent: 4247601 (1981-01-01), Wiegand
patent: 4263523 (1981-04-01), Wiegand
patent: 4484090 (1984-11-01), Wiegand et al.
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patent: 5216234 (1993-06-01), Bell
patent: 5461526 (1995-10-01), Hamakawa et al.
Sensor Engineering Co. (an Echlin Co.) 1990 "Zero Power Wiegand Sensor" 2 pgs.
HID Corporation
Paladini Albert W.
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