A Parameter-Free Method for Estimating the Stator Resistance of a Wound Rotor Synchronous Machine

Abstract

This paper presents a new online method based on low frequency signal injection to estimate the stator resistance of a Wound Rotor Synchronous Machine (WRSM). The proposed estimator provides a parameter-free method for estimating the stator resistance, in which there is no need to know the values of the parameters of the machine model, such as the stator and rotor inductances or the rotor flux linkage. In this method, a low frequency sinusoidal current is injected in the d axis of the stator current to produce a sinusoidal flux in the stator. In this paper, it is shown that the phase difference between the generated sinusoidal flux and the injected sinusoidal current is related to the stator resistance mismatch. Using this phase difference, the stator resistance is estimated. To validate the proposed model-free estimator, simulations were performed with Matlab Simulink and the results were compared with the extended Kalman filter observer. Finally, experimental tests, under different conditions, were performed to estimate the stator resistance of a WRSM.

Mathematical Decomposition of Fault Signature using Multinomial Identity and Differentiating for Detection of Broken Rotor Bar in Induction Motor

“…Therefore, what remains is the following signal, which is used to diagnose the faulty motor: A pseudo code of the proposed technique is shown in Figure 2. By applying the trinomial expansion identity to the stator current signal and subsequently obtaining its corresponding Hilbert transform while removing unwanted frequencies, a resulting signal can be obtained that contains expression (5). The differential frequency of this expression can be obtained by using FFT transformation.…”

“…Over the past few years, the use of induction motors in the electric vehicle (EV) industry has become increasingly widespread. The electric motor is a crucial component of an EV as it converts electric energy to mechanical energy [5]. Therefore, any failure in any of its components can directly impact the reliability of the powertrain and the safety of passengers [6,7].…”

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“…Moreover, in efforts to mitigate greenhouse gas emissions and air pollution, electrifying transportation systems can play a crucial role [1]. Consequently, the utilization of various types of electrical machines, such as synchronous machines, has witnessed significant growth in recent years [2,3].…”