Rotor Speed and Load Torque Estimations of Induction Motors via LSTM Network
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Koç Bilgi ve Savunma Teknolojileri A.Ş.
Nigde Omer Halisdemir University
Corresponding author
Recep Yildiz   

Nigde Omer Halisdemir University
Power Electronics and Drives 2023;8(Special Section - Artificial Intelligent Based Designs and Applications for the Control of Electrical Drives )
In this study, a long-short term memory (LSTM) based estimator using rotating axis components of the stator voltages and currents as inputs is designed to perform estimations of rotor mechanical speed and load torque values of the induction motor (IM) for electrical vehicle (EV) applications. For this aim, first of all, an indirect vector controlled IM drive is implemented in simulation to collect both training and test datasets. After the initial training, a fine-tuning process is applied to increase the robustness of the proposed LSTM network. Furthermore, the LSTM parameters, layer size and hidden size are also optimized to increase the estimation performance. The proposed LSTM network is tested under two different challenging scenarios including the operation of the IM with linear and step-like load torque changes in single/both direction. To force the proposed LSTM network, it is also tested under the variation of stator and rotor resistances for both direction scenario. The obtained results confirm the highly satisfactory estimation performance of the proposed LSTM network and its applicability for the EV applications of the IMs.
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