Motor control algorithms with high dynamics are generally based on two basic approach field oriented control (FOC) and direct torque control (DTC). The idea of the first one is to decompose the stator current based on the rotor flux, the second one controls the torque based on the stator flux. Therefore, the FOC is very sensitive to the parameter accuracy regarding the drive performance. That is why it is crucial to verify the parameter identification in the real environment. On the other hand, the parameter sensitivity of DTC is much smaller since the stator flux estimation requires only the knowledge of the stator resistance. The article focuses on the verification of rotor resistance identification in the FOC based drive system by means of the slip ring machine based test bench. The recommended procedure calculates the torque based on the stator current and flux to implement model reference adaptive system for online rotor resistance estimation without signal injection.
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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