Abstract
Abstract The electromagnetic torquemeter is a dynamometer of the transmission type. A calibrated shaft unit is directly connected in the rotating shaft where the torque is to be measured. This paper describes a slip-ring type of torquemeter in which the small torsional deflections in the shaft unit are measured by electromagnetic-gage elements and associated electrical components to give a continuous direct reading of torque with an accuracy of 1 per cent of full-scale torque. By proper mechanical and electrical design, effects of centrifugal forces and changes in brush resistance are held to negligible values. Several torquemeters of this type are now in use. They cover a range of 250 lb-ft at 8000 rpm to 10,000 lb-ft at 400 rpm. The same general torquemeter principle is readily applicable to much higher torque ranges.
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