| 摘要 |
A device and method for substantially enhancing the cooling of electric machines, e.g. motors and generators, is described. A hermetically-sealed chamber (50) surrounds electric wire winding end-turns (125) at eitehr end of the stator core (120), and contains at least one phase-change coolant. The coolant removes heat from the stator winding trhough the end-turns (125), where often temperatures are the greatest, through cyclical ebullition, whereby heat generated by the stator winding end-turns (125) boils and, subsequently, vaporizes the liquid coolant. The hot, vaporized coolant is removed through a least one vapor return passage (70) and collects, cools and condenses on the stator cooling jacket (105), which removes heat from the vaporized coolant. The liquid condensate precipitates into a wicking matrix (60), which continuously returns the liquid condensate through capillarity to the liquid coolant pool that partially wets the wicking matrix (60) and winding end-turns (125). Addition of a passive, phase-change colling system at the stator winding end-turns (125) substantially ehances cooling the machine, which can reduce the size, weight, and cost of machines, especially, e.g., linear-, switch reluctant-, variable reluctant-, induction-, rotary-, and permanent magnet-type machines, and can provide greater efficiency of operation, lower cost per power unit, and increased power density.
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