Drag Torque Tachometer
Print Overview
In a drag-torque tachometer a revolving permanent magnet mounted on the shaft induces eddy currents in an electroconductive disk or cup. These currents produce a flux that interacts with the flux from the magnet. As a result, a drag force on the disk or cup is generated. This force is proportional to the speed of the shaft and is converted into an electrical signal by a torque- or force-sensitive cell.
Drag-torque tachometer. w = angular speed, 1 = shaft, 2 = revolving permanent magnet, 3 = electroconductive disk, 4 = torque-sensitive cell.
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