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With the increase of the electrical machines capacity and voltage level, the main insulation of the stator coil becomes thicker. Heat dissipation and voltage endurance becomes a contradiction. The traditional cooling, such as air-cooling and water-cooling, will not well meet design needs. New cooling methods with both advantages of good cooling effect and good insulation are in keen demand in industry...
Different methods to improve the cold start of a stack were studied under the different conditions using experiments and simulations. The heat storage period of the stack was analyzed contrastively with / without heat storage. The stack not sealed by heat storage material needs merely 3 hours and 7 hours to drop to 0 °C from initial 80 °C in the ambient condition of - 20 °C, respectively, whereas...
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