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Open AccessArticle

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

1
The Faculty of Electrical and Computer Engineering, Rzeszow University of Technology, Aleja Powstańców Warszawy 12, 35-959 Rzeszów, Poland
2
Independent Researcher, 35-959 Rzeszów, Poland
*
Author to whom correspondence should be addressed.
Energies 2019, 12(23), 4551; https://doi.org/10.3390/en12234551
Received: 25 October 2019 / Revised: 27 November 2019 / Accepted: 27 November 2019 / Published: 29 November 2019
(This article belongs to the Special Issue Advances in Rotating Electric Machines)
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. View Full-Text
Keywords: double-cage induction motor; improvement of motor reliability; cage winding constructions; direct start-up; coupled electromagnetic-thermal model double-cage induction motor; improvement of motor reliability; cage winding constructions; direct start-up; coupled electromagnetic-thermal model
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MDPI and ACS Style

Mróz, J.; Poprawski, W. Improvement of the Thermal and Mechanical Strength of the Starting Cage of Double-Cage Induction Motors. Energies 2019, 12, 4551.

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