Electromagnetic Forces and Mechanical Responses of Stator Windings before and after Rotor Interturn Short Circuit in Synchronous Generators
Autor: | Hong-Chun Jiang, Gui-Ji Tang, Yu-Ling He, Qing-Fa Meng |
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Rok vydání: | 2020 |
Předmět: |
010302 applied physics
Physics Article Subject Stator Rotor (electric) General Mathematics 020208 electrical & electronic engineering General Engineering Mechanical engineering 02 engineering and technology Permanent magnet synchronous generator Engineering (General). Civil engineering (General) 01 natural sciences Finite element method law.invention Generator (circuit theory) law Electromagnetic coil 0103 physical sciences QA1-939 0202 electrical engineering electronic engineering information engineering TA1-2040 Short circuit Mathematics DC bias |
Zdroj: | Mathematical Problems in Engineering, Vol 2020 (2020) |
ISSN: | 1563-5147 1024-123X |
DOI: | 10.1155/2020/5892312 |
Popis: | This paper studies the stator winding electromagnetic force behaviors before and after rotor inter-turn short circuit (RISC) in synchronous generator. Different from other studies, this paper not only studies the electromagnetic force characteristics, but also investigates the mechanical responses, the damage regularity, and the countermeasure of the stator winding. Firstly, formulas of electromagnetic force online and end part are obtained. Then, a 3D finite element model of a 3-pair-pole simulation generator is applied to get the electromagnetic force, and the dangerous stator slot is found. Finally, the mechanical response of each end winding is acquired, and especially the directional deformations of nose part are calculated. It shows that the occurrence of RISC will bring in times of rotor rotating frequency components to electromagnetic force, but the DC component and 2p times of rotor rotating frequency components are still the main that will be decreased. Additionally, the winding insulation wear in the same layer is more serious than that in a different layer, nose fatigue fracture begins with the center, and nose insulation wear starts from the top. |
Databáze: | OpenAIRE |
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