Abstract
This paper proposes a second-order thermal model for electrical machines. The goal of this model is the prediction of the average winding temperature during short and long thermal transients up to the steady-state conditions. First, the thermal parameters of the electrical machine are determined by a DC test. Then, the proposed model is characterized and validated using AC tests. The accuracy of the proposed thermal model has been verified comparing the computed temperatures with the measured ones. The maximum error found during the thermal transient is lower than 3%, an excellent result comparing the complexity of a total enclosed fan cooled induction motor and the simplicity of the proposed model.
Highlights
Modern electric drives applications feature stressing operation profiles, characterized by repeated sequences of fast and short transients
Classical thermal models are often intended for off-line thermal studies of electrical machines [6] and can provide accurate results of the electrical machine temperature distribution; these models are not feasible for real-time implementation inside the electric drive control system and require a certain degree of knowledge of the electrical machine geometry and parameters
The goal of this paper is, to improve the second-order thermal model proposed for the first time in [13,14] and to put in evidence the measurement issue found during the thermal parameters determination
Summary
Modern electric drives applications feature stressing operation profiles, characterized by repeated sequences of fast and short transients. The goal of this paper is, to improve the second-order thermal model proposed for the first time in [13,14] and to put in evidence the measurement issue found during the thermal parameters determination As it will be shown, the second-order thermal model proposed in [13,14] lacks precision during the long transient (i.e., the time range before reaching the steady-state temperature). For this reason, to improve the performance of that model, the heat transfer due to the end winding has been considered, and this new second-order thermal model is deeply analyzed in this paper.
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