Abstract
The applications of state feedback optimal control techniques to the drives using as an actuator a frequency controlled induction motor are exciting a great interest. These applications are based on the employment of a microcomputer-based control system, which is characterized by a finite computation time. In addition, during a sampling period, they give as output either the desired values of the modulus and the phase-displacement of the representative vector of the motor supply voltages or the desired values of the pre-jections of this vector according a pair of orthogonal axes. Owing to this, it is impossible to utilize the usual modulation techniques, which allow imposing the modulus and the angular frequency of the representative vector of the motor supply voltages. The paper describes a modulation technique, which is suitable to be used with three-phase bridge inverters and can be utilized in the aforesaid applications, since it accepts as inputs the projections of the voltage representative vector according to two orthogonal axes fixed with the stator windings of the motor. The description of an algorithm for the implementation on a microcomputer-based control circuit of the proposed modulation technique and some remarks about the obtained results conclude the paper.
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