Measuring and testing – Dynamometers – Responsive to torque
Patent
1986-05-21
1989-09-05
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
34087037, 361298, G01L 310, G08C 1916
Patent
active
048627526
ABSTRACT:
A capacitive transducer for measuring the rotation of a shaft including relatively movable rotor and stator elements. A unique arrangement of capacitive plates is mounted on the stator and rotor for producing a signal indicative of shaft rotation using direct current excitation but without requiring brushes, commutators or slip rings. A preferred embodiment may further include co-planar first, second and third stator plates or alternatively, cylindrically shaped stator and rotor plates. The number of stator plate segments included in each of the first and second stator plates, of the embodiment employing co-planar plates, may be an even multiple less than the number of rotor plate segments. By this arrangement, a circumferential gap may be provided in the first and second plates through which an extension of the third stator plate may be located to reach an output signal terminal located adjacent to but beyond the radial extent of the first and second stator plates.
REFERENCES:
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patent: 3961318 (1976-06-01), Farrand et al.
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patent: 4550618 (1985-11-01), Kohama et al.
Ferrotec, Inc.
Ruehl Charles A.
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