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| Fluid field calculation and temperature rise optimization of inner wind path for medium-size high-voltage asynchronous motor |
| 1. School of Electrical ＆ Electronic Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang 150080, China; 2. Panasonic Motor (Zhuhai) Co., Ltd., Zhuhai, Guangdong 519060, China |
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Abstract To investigate the effects of duct number in motor on inner wind path flow and temperature rise, the YKK450-4 of 500 kW medium high-voltage asynchronous motor was taken as example. According to the actual scale, the flow field of inner wind path and the winding end region of stator were simulated to achieve the physical actual model of fluid-solid coupling. Based on the calculation of flow field of the stator, the flux and the flow velocity at each entrance of rotor bracket of ventilator were obtained. The calculation of motor stator was conducted by piecewise fluid-solid coupling method to obtain the highest temperature rise region. According to the hottest position by numerical calculation, a temperature sensor was embedded in the prototype to conduct temperature rise experiment. The results were compared to verify the physical model and solving method. Under the condition that the motor shell size remains unchanged, the width of ducts was changed to reconstruct model for discussing the effects of duct number on fluid flow and heat transmission in motor ducts, and the hottest position for different duct numbers was calculated. The results show that when 9 equal width ducts are adopted, the maximum fluid velocity in motor ducts is obtained. The motor temperature rise is 104.9 K, and the highest temperature rise is decreased by 11.2 K than that under the condition for 10 ducts with the highest temperature rise of 116.1 K.
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Received: 04 July 2016
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2017, Vol. 38 
