G - Physics – 01 – P
Patent
G - Physics
01
P
73/18
G01P 3/42 (2006.01) G01P 3/495 (2006.01)
Patent
CA 1076833
MB-6179 EDDY-CURRENT DEVICE FOR MEASURING ROTATIONAL SPEED Abstract of the Disclosure An eddy-current speedometer having a rotatably driven permanent magnetic element and a cooperating eddy-current rotary element provided with an indicating device and mounted to rotate coaxially therewith and be set rotating by alternating magnetic fields generated by the magnetic element at spaced points there around and penetrating the rotary element in directions radially thereof, has its magnetic element made of a magnetic material of low permeability and provided with at least eight sets of magnetic poles of alternating polarity equally spaced apart in a con- centric path around the rotatable magnetic element with the poles of each set being of opposite polarity and spaced apart radially of the rotatable magnetic element to define an air gap there- between. The rotatable magnetic element is provided with a temperature compensating element in the form of a ring member concentric with and overlying corresponding ones of the poles of the concentrically arranged magnetic pole sets to compensate for changes in the magnetic flux developed by the permanent magnetic member, and changes in the electrical conductivity of the rotary element, which result from ambient temperature fluctuations.
297779
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