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This paper proposes an active flux observer
for motion-sensorless biaxial excitation generator for
automobiles (BEGA) for wide speed operation. The active
flux observer transforms BEGA, a salient-pole rotor ac
machine, in a virtually non-salient pole machine model so
that the rotor speed and position can be estimated in a
simpler way. Simulations and experimental results are
presented to verify the principles and to demonstrate the
performance of the proposed observer. A rotor position
and speed estimator, based on active flux estimation is
proposed and tested. The performance (accuracy) of the
observers has been tested with the drive system operated
from very low speed down to 2 rpm, with full load and up
to 2000rpm

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