Multi-pole permanent magnet rotor
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United States of America Patent
Stats
-
Apr 7, 1981
Grant Date -
N/A
app pub date -
Sep 18, 1978
filing date -
Sep 19, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A disk-shaped magnet attached to a rotary shaft is circumferentially segmented into a plurality of segments which are magnetized to form driving magnetic poles. A plurality of velocity detecting magnetic poles are also arranged on the disk-shaped magnet concentrically to the driving magnetic poles. The number of the velocity detecting magnetic poles is larger than the number of the driving magnetic poles to increase the frequency of an output signal of a velocity detecting coil which interlinks with the velocity detecting magnetic poles so that a response speed of a velocity control circuit is increased.
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