Research Paper
Year: 2021 | Month: March | Volume: 8 | Issue: 3 | Pages: 621-630
DOI: https://doi.org/10.52403/ijrr.20210379
Thermal Analysis of Electric Machines for Combined Stirling Engine-Generator Performance
V. Zogbochi1, P. Chetangny2, D. Chamagne3, S. Houndedako4, G. Barbier5, A. Vianou6
1,2,4,6Department of Electrical Engineering, University of Abomey-Calavi, Abomey-Calavi, Benin
3Department of Energy, FEMTO-ST - UMR CNRS 6174, University of Bourgogne Franche-Comte, Belfort, France
4Department of Physics and Textile Mechanic, University of Haute Alsace, Mulhouse, France
Corresponding Author: V. Zogbochi
ABSTRACT
The performance of an electric machine depends on its ability to resist rising internal temperature and ambient temperature. In particular when it is a combination with a heat engine, it is essential to know the thermal characteristics of the electric machine in connection with its operating environment to decide which type of machine for a better result. This work will make a comparative thermal study of three types of generators namely: the permanent magnet generator (PMSG), the squirrel cage asynchronous generator (SCIG) and the switched reluctance generator (SRG), all driven by Stirling engine. The method involves solving the heat propagation equation to determine the thermal resistance network for each machine. The resolution of the network combined with the finite element method will allow a comparison of the temperature rise and its effect on the performance of each machine.
The simulation results show that the temperature of the PMSG windings stabilizes at 430 K while that of the others stabilizes at 373 K and 346 K respectively. However, when comparing the performances for the specifications of this work (i.e., produce minimum electric power of 2kW at low speed generated by the Stirling engine), PMSG is the one that fulfil all the requirements. For the use of this machine for the generator set, it will be necessary to use magnets of types GNS-39EH whose operating temperature is approximately 473K (200 ° C) with magnetic induction of 1.22 T.
Keywords: choice of machines, thermal network, Finite Element Method, machine’s performances, Stirling engine.
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