| 摘要 |
<p>A gas-cooled a.c. machine having a rotor and a stator, each in the form of sheet metal packs, and a winding head, wherein in order to obtain optimum cooling of the rotor sheet metal pack, the stator sheet metal pack and the winding head, the machine is constructed of a stator central part and two stator end parts and ducts are provided in the casing corners for the removal of the cooling gas. The ducts are bounded only by the walls of the casing and the back of the stator sheet metal pack, are separated by the stator sheet metal pack, and extend over the total length thereof. Cooling gas conveyed by fans is first conveyed into the inner winding head chamber or the rotor inlet flow chamber and there divided into two cooling circuits connected in parallel. In a first cooling circuit, the cooling gas is led through the rotor sheet metal pack and through the stator sheet metal pack, and in the second cooling circuit through the winding head. The stator end parts are each formed as cooling gas inlet and outlet casings and are provided with separating walls for separating the two cooling circuits. The separating walls have by-pass openings whose respective effective cross-sectional areas can be varied by displaceable cover plates.</p> |
