Self-adjusting exciter band for shaft speed magnetic pickup

摘要

An exciter for use with a shaft speed magnetic pickup includes a strip of flexible, stretchable, sheet material having a plurality of magnetic elements attached to it that are uniformly spaced along the strip, enabling the magnetic elements to be attached to the exterior of various diameter rotatable shafts by stretching and fastening the strip about the circumference of the shaft close to the magnetic pickup which generates an electrical pulse signal whenever a magnetic element passes by it. The pulse signal is processed to produce a readout of shaft speed. Two magnetic pickups circumferentially spaced about the shaft closer than the circumferential spacing of the magnetic elements are used to provide signals that can be processed to indicate shaft direction of rotation as well as shaft speed.