Comparison of the sensitivity of the flux control to parameter uncertainties in two induction actuator indirect field oriented control schemes

The aim of this paper is to compare the sensitivity of the flux control to the parameter uncertainties in two induction motor actuator indirect field oriented control schemes. In the first control scheme, the currents are controlled by PI regulators, whereas in the second one the currents are not directly controlled. In this second scheme, interesting for small power motors, the stator currents are not measured but only estimated, which simplifies the hardware implementation. It is shown that, in the control scheme without current control, the flux control is less sensitive to errors on the values of the mutual inductance and of the rotor resistance than in the control scheme with current PI regulators. This is demonstrated by a theoretical study and digital simulations. Furthermore the good performance of the control scheme without current measurement, which is less common than the control scheme with current control, is shown by experimental results