Motor-In-The-Loop Approach in the Validation of an Induction Machine Model – Online Rotor Resistance Estimation
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In The article introduces a new motor-in-the-loop (MotIL) concept as a new system level test method for variable frequency drives. The main idea of this methodology is to use a slip ring motor to investigate the effect of the drive system on a real motor. Because of the slip ring structure, the rotor side signals and parameters can be directly observed online as well as offline. Therefore, it can be a good extension of the HIL and PHIL solutions. Compared with HIL and PHIL methodology the MotIL makes it possible to observe the drive system behavior in real physical environment including noises, coupling, nonlinearity and other potentially not modeled factors.
A case study related to rotor resistance estimation is also presented aiming to prove the performance of the MotIL concept. The presented MotIL algorithm focuses on the accurate and robust rotor flux calculation and online rotor resistance measurement. The concept of the introduced algorithm is based on collaboration and self-adaptation of two independent rotor flux estimator.
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