Electric machine with thermosiphon-type cooling system

Details Electric machine with thermosiphon-type cooling system Electric machine with thermosiphon-type cooling system

2006-09-05

2006-09-05

Le, Dang D. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S052000, C310S058000, C310S064000

Reexamination Certificate

active

07102267

ABSTRACT:
An electric machine includes a housing for accommodating a rotatably supported rotor and a stationary stator, and a cooling device for cooling heat-generating components of the rotor and the stator. The cooling device includes a closed-flow system having an evaporator disposed in the housing, a condenser disposed outside the housing at a geodetically higher location, and a closed tube assembly, which connects the condenser and the evaporator, for circulating a coolant using a thermosiphon effect as a result of a difference in density between vapor and liquid portions of the coolant. The closed-flow system contains a liquid-vapor mixture of the coolant in a saturated state and includes a first tube for conducting coolant to the evaporator and a second tube for conducting coolant away from the evaporator. The first tube has hereby a cross section which is smaller than a cross section of the second tube.

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