Measuring and testing – Dynamometers – Responsive to torque
Patent
1985-09-12
1987-03-24
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
324209, G01L 310
Patent
active
046515739
ABSTRACT:
A nonintrusive torquemeter for measuring torque in a shaft having variable reluctance as a result of torque stresses developed in the shaft. The torquemeter includes an annular first coil, a second coil wound about the first coil coaxially of the annular axis of the first coil to be in space quadrature therewith, structure for mounting the coil assembly coaxially about the shaft to include the shaft in the magnetic flux coupling path between the coils, and structure for providing a signal corresponding to the voltage developed in the pickup winding as a result of changes in the magnetic reluctance of the shaft resulting from torque developed therein. One of the coils is electrically excited to define an excitation winding, and the other of the coils serves as a pickup winding, with the coils being effectively uncoupled in the absence of torque in the shaft and being variably coupled as an incident of torque being developed in the shaft causing a corresponding change in the reluctance thereof. A shield is provided for substantially eliminating inherent coupling between the coils under zero torque conditions, and in the illustrated embodiment, the shield is defined by an annular magnetic core structure extending about the inner coil. A shielding core structure may be provided extending about the assembled coils shielding them from external magnetic fields and providing mechanical protection to the torquemeter. In one illustrated embodiment, a shield is provided for shielding the secondary portion of the outer coil from torque-induced voltages in the inner coil. The outer coil may be differentially wound with a first turn portion wound in a first helical direction and a second turn portion wound in an opposite helical direction.
REFERENCES:
patent: 4479390 (1984-10-01), Meixner
Himmelstein Sydney
Tveter Richard S.
Ruehl Charles A.
S. Himmelstein and Company
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