A note on identifiability of induction motors

Generally, controlling or monitoring induction motors requires the knowledge of electrical parameters which might not be accurately available, and are anyway known to vary while the motor is operating. For these reasons, various algorithms have been proposed for the identification of these parameters, usually based on stator currents and rotor speed measurements, and generally validated by simulations. The purpose of this note is to study in more details the (structural) identifiability of the involved parameters. This study is prolonged by that of both parameter and state estimation.