Electricity: measuring and testing – Electrical speed measuring – Including speed analog electrical signal generator
Patent
1981-11-23
1984-04-03
Krawczewicz, Stanley T.
Electricity: measuring and testing
Electrical speed measuring
Including speed analog electrical signal generator
73519, G01D 348, G01D 354
Patent
active
044410778
ABSTRACT:
A real time tachometer is realized in an electromechanical device having a moving member, for example a disk, of nonmagnetic electrically conductive material driven by a suitable moving device, for example a rotating shaft, the velocity of which is to be determined. An assembly of at least one permanent magnet and at least one Hall effect device is arranged for inducing eddy currents in the moving member or rotating disk and measuring them for indicating the relative velocity. The placement and electric interconnection of the Hall effect devices measure the magnetic field provided by the magnet and in an alternate embodiment incorporate compensation for runout and adverse deflection with a rotating disk.
REFERENCES:
patent: 3932813 (1976-01-01), Gallant
patent: 4011476 (1977-03-01), Beard
patent: 4093917 (1978-06-01), Haeussermann
G. M. Berkin, "Magnetic Tachometer", IBM Technical Disclosure Bulletin, vol. 3, No. 3, Aug. 1960, p. 74.
D. E. Cuzner et al., "Shaft Speed Detector", IBM Technical Disclosure Bulletin, vol. 11, No. 3, Aug. 1968, p. 347.
A. B. Wills, "Magnetic Tachometer", IBM Technical Disclosure Bulletin, vol. 16, No. 1, Jun. 1973, p. 260.
Dodgen David F.
Siegl Ludwig R.
Cummins R. E.
International Business Machines
Krawczewicz Stanley T.
Roush G. E.
Solis Jose M.
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