Rotor for dynamo electric machine

Details Rotor for dynamo electric machine Rotor for dynamo electric machine

1994-10-20

1995-10-17

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

310261, H02K 3487, H02K 122

Patent

active

054593638

ABSTRACT:
The rotor for a dynamo electric machine serving as a synchronous generator as well as being designed operable as a variable speed motor for starting a prime mover for the synchronous generator, the rotor (1) comprising a rotor core (2), a plurality of slots (4) disposed around the circumference of the rotor core (2) and extending along the axial direction of the rotor core (2), rotor windings (3) being accommodated in the slots (4) and wedges (6) being accommodated in the slots (4) over the rotor windings (3) near at the surface of the rotor core (2) for preventing the rotor windings (3) from being pushed out due to a centrifugal force caused by rotation of the rotor (1), wherein wedges (6) where an eddy current flows are formed by Cu-0.05.about.4 wt % Zr-0.3.about.5 wt % Ni-0.2.about.1.5 wt % Si having a 0.2% proof stress equal to or more than about 20 Kg/mm.sup.2 and an electrical conductivity equal to or more than about 20% IACS (International Annealed Copper Standard), whereby damages of the rotor elements due to electrolytic corrosion are prevented.

REFERENCES:
patent: 4594221 (1986-06-01), Caron et al.
patent: 4843271 (1989-06-01), Shah
patent: 4876469 (1989-10-01), Khutoretsky et al.
patent: 5030871 (1991-07-01), Shah et al.
patent: 5252877 (1993-10-01), Sawa et al.
N. Takahashi et al., "Improvement of Unbalanced Current Capability of Large Turbine Generators," in IEEE Transactions on Power Apparatus and System, vol. PAS-94, No. 4, Jul./Aug. 1975, pp. 1390-1397.

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