Title: Synchronous machine with a rated power of at least 1 MVA

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Abstract: An asynchronous machine with a rated power of at least 1 MVA has a laminated stator core which supports a multiphase AC winding and a rotor surrounded by the stator core and having a length substantially greater than the length of the laminated stator core. The rotor has winding slots running axially along its whole length, each of the slots having wall portions facing each other and converging radially outward in connection with a central plane. Winding bars are arranged in the winding slots and are included in a squirrel-cage winding and fit the slot walls. An annular winding portion at each end of the rotor short-circuits the rotor bars, such winding portion lying axially within the end surface of the rotor core and outside the end surface of the stator core. The bars may be U-shaped in cross-section, with one flange of each adjacent pairs of bars located in the same winding slot. The end portions of the rotor core have annular grooves therearound.


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