Rotation sensor device
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United States of America Patent
Stats
-
May 11, 1982
Grant Date -
N/A
app pub date -
Jul 24, 1979
filing date -
Jul 25, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plurality of slots are disposed at equal angular intervals on one portion of a circular ring-shaped field magnet fixed to a motor's rotor to run radially of the magnet. Alternatively, short rods made of a soft magnetic material may extend radially outwards from the lateral surface of the magnet to form the slots between them. Three magnetic sensor elements are disposed at equal angular intervals of 120 degrees on a motor's stator to face successively the slots during the rotation of the rotor.
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