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Old Sep 06, 2005, 03:42 AM
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Antony (France)
Joined Sep 2003
3,163 Posts
Hi Gordon
Between the 3 following principles
a) Back EMF sensing
b) Hall sensors
c) Optical sensors
the optical method offers a lot of advantages:
*Good accuracy
*Independance relatively to excitation of terminals A,B,C
*Absolute position sensing possible (good for starting from stop)

A priori it is a good principle with good associated algorithms
Louis
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