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| Winding Temperature Rise of Rotor End and Inner Slot of Turbo Generator |
| Lu Yiping1, Yin Wenhao1, Han Jiade1, Li Weili1, Li Junting2, Cao Wen2, Jin Huiyong2 |
| 1. Harbin University of Science and Technology Harbin 150080 China 2. Harbin Electric Machine Company Limited Harbin 150040 China |
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Abstract In view of the rotor cooling structure with multi-path ventilation, in order to obtain more complete temperature distribution along the length direction of the rotor coils, a calculation model of three dimension heat transfer and turbulence is presented on basis of the research on the air flow rate distribution of the rotor's half axial segment, combined with a given example of some large turbo generator rotor with air cooling, and the model consists of rotor end winding and the half length of rotor. Based on computational fluid dynamics (CFD) principle, the temperature field of initial rotor ventilation structure is calculated by finite volume method. Based on the results, the number of ventilation ducts among the sub slot ventilation and the position of end inlet is adjusted to increase the end air flow rate and to decrease the temperature of rotor end windings and axial of the rotor end temperature difference among the rotor body windings. The results show that the maximum temperature is located in the mid arc segment of the top winding; the maximum temperature of the rotor body winding is locatein the axial ventilation segment. The conclusion will provide theoretical guidance to optimization design of rotor ventilation.
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Received: 12 June 2008
Published: 12 December 2014
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2010, Vol. 25 
