Dynamoelectric machine

Details Dynamoelectric machine Dynamoelectric machine

1996-09-09

1999-03-23

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310 58, H02K 920

Patent

active

058864334

ABSTRACT:
A dynamoelectric machine is provided with an arrangement in the form of a plurality of cooling tubes disposed in or adjacent the stator core of the machine and through which a coolant is caused to flow. The coolant tubes extend axially with respect to the rotor of the machine and are spaced around the circumference of the stator. In order to regulate the cooling efficiency and reduce the coolant pressure loss in the coolant tubes, a branching arrangement in combination with a valve arrangement is disposed in at least one of the end brackets of the machine to control the flow of coolant in parallel selectively through different combinations of cooling tubes. The branching arrangement includes a plurality of circumferentially disposed chambers which communicate with respective groups of cooling tubes in parallel, and the valve arrangement allows connection of these chambers selectively in different combinations to a coolant supply and a coolant exhaust. Thereby, the coolant tubes can be connected to form different combinations of parallel passages for carrying coolant to cool the stator of the machine.

REFERENCES:
patent: 3681628 (1972-08-01), Kratschew
patent: 3801843 (1974-04-01), Corman et al.
patent: 3955272 (1976-05-01), Hallerback
patent: 4691131 (1987-09-01), Nakano
patent: 4745314 (1988-05-01), Nakano
patent: 4753284 (1988-06-01), Krause et al.
patent: 4864172 (1989-09-01), Dodt
patent: 4874972 (1989-10-01), Bansal et al.
patent: 5488118 (1996-01-01), Nakamura et al.
patent: 5490319 (1996-02-01), Nakamura et al.

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