Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With electromagnetic field
Patent
1985-03-25
1987-02-24
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With electromagnetic field
116297, G01R 120
Patent
active
046460071
ABSTRACT:
The zero position in a sine cosine indicator for a tachometer is determined by a projection on the magnetized rotor arranged to encounter a stop projecting from the enclosing bobbin wall. A weak stationary secondary magnet is located adjacent the rotor with the magnetic axis of the secondary magnet rotated through an angle less than full scale from the magnetic axis of the rotor when the rotor is in the zero position. Alignment and crossover between the two magnetic axes is arranged to occur when the pointer associated with the rotor is approximately at midscale. Consequently any distortion of the scale to either side of the crossover point is in opposite directions and the overall appearance of the scale to the casual observer is linear.
REFERENCES:
patent: 2668945 (1954-02-01), Pfeffer
patent: 3094659 (1963-06-01), Pfeffer
patent: 3460038 (1969-08-01), Ziegler
patent: 3777265 (1973-12-01), Void
patent: 4090131 (1978-05-01), Mas
patent: 4197494 (1980-04-01), Van de Werken
patent: 4492920 (1985-01-01), Reenstra
Eisenzopf Reinhard J.
Solis Jose M.
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