Estudo e implementação computacional de estimativa do conjugado eletromagnético de um motor de indução trifásico.

Abstract

Commonly, the vector control of induction motors (MIT) requires the sensing of quantities such as speed and torque, which are measured using tachometers and torque meters, respectively. The use of these sensors implies a complex and economically unfeasible task, which is often avoided by estimating the machine's magnitudes. Therefore, this work proposes the implementation of vector control, with the aim of applying it to electric vehicles, using the electromagnetic torque estimation technique together with the rotor flux of three-phase induction motors. The implemented techniques only require the acquisition of the machine's electrical parameters: stator winding currents and voltage. However, to implement the estimator it is necessary to perform the axis transformation, moving from a coupled system in three-phase coordinates to a decoupled system in two-phase coordinates. The methodology used to effect this change of coordinates is the Park and Clark Transform. Regarding the project analysis, the system was tested under different operating conditions, highlighting severe operations such as load step, reversal in the direction of rotation and starting transients.