Wirbelstrommeßwerk für ein Zeigerinstrument

摘要

The invention concerns an eddy current measuring arrangement for an indicating instrument, said arrangement comprising a rotary magnet (8) which is disposed in rotationally rigid manner on a primary shaft and lies opposite an eddy current body (9) which is made of electrically conductive material and is secured in rotationally rigid manner on an indicator shaft (10), said rotary magnet being designed to transmit a first torque to the indicator shaft when the primary shaft (6) rotates. The arrangement further comprises a torsion spring (11) which transmits to the indicator shaft a second torque acting in the opposite direction to the first torque, a short-circuit member (12, 13) which is disposed behind the eddy current body and/or behind the rotary magnet, and a temperature-dependent compensation element (14, 17) for compensating an attenuation of the magnetic field of the rotary magnet and a reduction in the conductivity of the eddy current body as the temperature increases. According to the invention, the compensation element (14 - 17) takes the form of a spring element which is designed to reduce the second torque transmitted by the torsion spring (11) to the indicator shaft (10) or to maintain constant the first torque transmitted to the eddy current body (9) as the temperature increases.