SLIP RING COOLING DEVICES FOR ELECTRICAL ROTARY MACHINES

摘要

The invention relates to a slip ring cooling device for an electrical rotary machine. The device includes a plurality of closed chambers in the slip ring extending axially in the peripheral portion with intervals therebetween in the peripheral direction, and an annular passage at one side. The closed chambers each are defined by the surfaces of holes made in the slip ring so as to axially extend at the peripheral portion of the slip ring. The axially extended holes have open ends and closed ends. The annular passage is fluidly connected to each of the open ends so that the closed chambers communicate with the annular passage. A volatile liquid introduced into the passage is distributed uniformly to each of the closed chambers by centrifugal force applied thereon upon the rotation of the slip ring. The distributed liquid is evaporated by the slip ring and brushes contacting the slip ring to form a vapor. The vapor is transferred to the lower temperature portion by the pressure difference where it is cooled and condensed, thus cooling the slip ring uniformly. The device allows efficient cooling of the slip ring without vibrational problems or protruding structure.