It is obvious that Direct Rotor Flux Orientation control scheme (DRFO) is very useful in operation that doesn't need a direct speed measurement (sensor less operation) and so uses less sensors.
Is there anyway we can avoid the occurrence of dc offset input to a fixed axis (alpha-beta) voltages in DRFO control of induction motor that consequently causes a drift in the open loop integrator? Please suggest if possible a practical applicable solution to use this scheme for all frequency range.
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