Rotor Speed and Load Torque Estimations of Induction Motors via LSTM Network
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1
Department of Electrical and Electronic Engineering, Nigde Omer Halisdemir University, Nigde, Türkiye
2
Koç Bilgi ve Savunma Teknolojileri A.Ş., Middle East Technical University Technopolis, Ankara, Türkiye
Power Electronics and Drives 2023;8(Special Section - Artificial Intelligent Based Designs and Applications for the Control of Electrical Drives ):310-324
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ABSTRACT
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 optimised 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 a single direction and in both directions. To force the proposed LSTM network, it is also tested under the variation of
stator and rotor resistances for the 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.