Importance

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Abstract

An electrical machine (10), in particular a generator, comprises a rotor (12) with pole zones, in which pole zones amortisseur bars (15) designed as wedges are arranged, which amortisseur bars (15), on the outside of the rotor (12), are pushed into slots (14) provided for this purpose and running in the longitudinal direction and are held in the slots (14) by supporting means (28) against the centrifugal forces occurring during rapid rotation of the rotor (12) and which are connected to one another in an electrically conductive manner at the ends of the rotor (12) by an amortisseur ring (18) or amortisseur segments (17), which enclose the rotor (12) in an annular or ring-section-shaped manner. In such a machine, reliable fixing and electrical bonding of the amortisseur bar in the slot when the machine is stopped and at low rotational speeds with at the same time ease of fitting is achieved in that prestressable spring elements (22, 23, 24) are arranged in a distributed manner on the underside of the amortisseur bars (15), which spring elements (22, 23, 24), in the prestressed state, enable the amortisseur bars (15) to be pushed into the slots (14) without hindrance and, after the prestressing has been removed, press the amortisseur bars (15) against the supporting means (28) and at the ends of the rotor (12) against the amortisseur rings (18) or amortisseur segments (17).

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First Claim