Magnetized torque transducer elements

Details Magnetized torque transducer elements Magnetized torque transducer elements

2005-06-28

2005-06-28

Lefkowitz, Edward (Department: 2856)

Measuring and testing

Dynamometers

Responsive to torque

C073S863520

Reexamination Certificate

active

06910391

ABSTRACT:
The problem of magnetoelastic cirumferentially-magnetized torque transducers having a zero output magnetic field at zero torque is solved by pre-torqueing. This entails is circumferentially magnetizing the transducer element at a predetermined torque. The technique is advantageously applied to a pair of transducer elements (32, 34: 62, 64) whose outputs are combined (FIG.6a:76) to provide a range of measurement of torque (clockwise and counterclockwise) including zero torque. Various combinations of direction of pre-torque and direction of circumferential-magnetization are discussed. A circuit (FIG.8) is disclosed for combining the signals to obtain a reference level (84) for gain control of the combined output signals V o from the two transducer elements (60, 62). Also disclosed is the application of the invention to other forms of torque transducer element in which a magnetic field is stored. One form is longitudinal magnetization (FIG.10a). Another is radially spaced magnetization (FIG.12a: FIG.13).

REFERENCES:
patent: 4697460 (1987-10-01), Sugiyama et al.
patent: 4896544 (1990-01-01), Garshelis
patent: 4907462 (1990-03-01), Obama et al.
patent: 4920809 (1990-05-01), Yoshimura et al.
patent: 5195377 (1993-03-01), Garshelis
patent: 5351555 (1994-10-01), Garshelis
patent: 5412999 (1995-05-01), Vigmostad et al.
patent: 5465627 (1995-11-01), Garshelis
patent: 5520059 (1996-05-01), Garshelis
patent: 6047605 (2000-04-01), Garshelis
patent: 6260423 (2001-07-01), Garshelis
patent: 6330833 (2001-12-01), Opie et al.
patent: 3437379 (1985-04-01), None
patent: WO 99/56099 (1999-11-01), None
-“A new torque transducer using stress sensitive amorphous ribbons”, Harada et al; Proceedings of the Third Joint Intermag-Magnetism and Magnetic Materials Conference, Montreal, Que., Canada, Jul. 20-23, 1982; vol. MAG-18 No. 6, pp. 1767-1769; XP000606539; IEEE Transactions on Magnetics, Nov. 1982; USA; ISSN: 0018-9464; abstract Figures 1,4,5.
-“A Single Transducer for Non-Contact Measurement of the Power, Torque and Speed of a Rotary Shaft”, I.J. Garshelis, et al., SAE Technical Paper Series No. 950536 published 1995 by Soc. of Automotive Engrs.

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