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Improvement of the Thermal and Mechanical Strength of the Starting Cage of Double-Cage Induction Motors

Author

Listed:
  • Jan Mróz

    (The Faculty of Electrical and Computer Engineering, Rzeszow University of Technology, Aleja Powstańców Warszawy 12, 35-959 Rzeszów, Poland)

  • Wojciech Poprawski

    (Independent Researcher, 35-959 Rzeszów, Poland)

Abstract

This article discusses the thermal and mechanical exposure of the starting cage of a double-cage induction motor rotor during start-up. Damage to the starting cage is the most common cause of failure of a double-cage winding during long start-ups. It has been indicated that the end region of the double-cage winding is a key area in the search for a more damage-resistant solution. Among the available studies on improving the mechanical strength of double-cage windings, which typically focuses on improving the cooling system, modifying the shape of the slots, or altering the bar material, a new concept of improving the mechanical strength through the modification of the structure of the end region has appeared. This is achieved by applying sleeves onto the ends of the starting cage bars, which helps to reduce the temperature of the connection between the starting bars and the end rings. A simulation of the temperature field of a double-cage induction motor with this new design is performed and discussed in this paper. It has been confirmed that the new design solution effectively improves the mechanical strength of the starting cage, making it less prone to damage caused by thermal stresses.

Suggested Citation

  • Jan Mróz & Wojciech Poprawski, 2019. "Improvement of the Thermal and Mechanical Strength of the Starting Cage of Double-Cage Induction Motors," Energies, MDPI, vol. 12(23), pages 1-13, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:23:p:4551-:d:292227
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    References listed on IDEAS

    as
    1. Ying Xie & Jinpeng Guo & Peng Chen & Zhiwei Li, 2018. "Coupled Fluid-Thermal Analysis for Induction Motors with Broken Bars Operating under the Rated Load," Energies, MDPI, vol. 11(8), pages 1-17, August.
    2. Cleber Gustavo Dias & Luiz Carlos da Silva & Ivan Eduardo Chabu, 2019. "Fuzzy-Based Statistical Feature Extraction for Detecting Broken Rotor Bars in Line-Fed and Inverter-Fed Induction Motors," Energies, MDPI, vol. 12(12), pages 1-29, June.
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    Cited by:

    1. Jarosław Joostberens & Adam Heyduk & Sergiusz Boron & Andrzej Bauerek, 2020. "Optimal Selection of Time-Current Characteristic of Overcurrent Protection for Induction Motors in Drives of Mining Machines with Prolonged Starting Time," Energies, MDPI, vol. 13(17), pages 1-14, August.
    2. Zheng Cao & Yuanjun Zhou & Na Wang, 2020. "Starting Pulse Vibration Torque Analysis of Aviation Variable Frequency Asynchronous Motor Based on Low-Frequency Step-Down Starting Methods," Energies, MDPI, vol. 13(6), pages 1-18, March.

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