SCs (FLSCs) system. In 2009, our work [14] improves the Hybrid Efficiency Control system proposed from [13],
during transient and steady states. For many industrial control applications the efficiency improvement during
transient motor operation (torque or speed transitions) is very important because they represent an important part of
the total motor operation. In cases such as cranes, elevators,electric vehicles, the energy losses minimization during
transient states can be of extreme importance. In our present work, is proposed a fuzzy real time control scheme which
reduces motor flux levels during steady operation, while during transitions the flux is recovered to an optimum value
(lower or equal than the rated), in order to optimize the power input consumption, to accelerate the search process
during steady states, and to maintain the drive dynamic response on acceleration and deceleration mode. For low
load torque operation the air-gap flux is reduced in constant torque operation and for high speed operation in the constant
power region. The proposed fuzzy based control scheme is incorporated into an adjustable speed drive (ASD) which
utilizes Indirect FOC control. The design of the parameters of the new fuzzy control scheme is focused on the concept to
recognize the motor state operation (steady or transient) and to adjust the motor flux under the corresponding
circumstances. The flux is reduced during steady operation depending of the minimization of the power losses
measurement and is increased during transient operations depending on the measurements of speed and load torque.