The Torrington Company

Stephen J Lyle

A John Santos

Mark E LaCroix

Mark E La Croix

Francis Travostino

The invention relates to a digital sensor of relative position, which has a circular multipolar magnetic ring which is mobile in rotation opposite a stationary magnetic sensor comprised of at least two sensitive elements, respectively positioned facing a main track and a &ldquo;revolution tick&rdquo; reference track, and a device for processing of the output signals, such that on the magnetic ring, a magnetic pattern is produced from a pair of north and south poles whose transition is different from the transition between the other north and south poles of the magnetic ring, and of which the angular width of the north pole is different at the site of the &ldquo;revolution tick&rdquo; reference track. The sensitive elements can be three in number, the first of which faces reference track and of which the other two face the main track, or they can be produced in the form of two parallel bars.

Digital sensor of relative position

Magnetic poles are regularly spaced along a path to form a magnetic track. Some of the magnetic poles are separated by regular pole junctions aligned uniformly with respect to the path of the magnetic track. At least two of the magnetic poles are separated by a skewed irregular pole junction aligned such that a sensor near an edge of the magnetic track will sense a wide pole and a narrow pole to allow an index signal to be produced.

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Torrington, CT, United States of America

Stephen J Lyle