Rotating electrical machine with evaporation cooling

Claim 2

A rotatable electric machine comprising a stator having a coil, a rotor, a first pole ring driven by said rotor, a housing enclosing and hermetically sealing said stator, rotor and first pole ring, a second rotatable pole ring exterior of said housing and adapted to be rotatably driven by said first pole ring, a magnetically permeable separating wall forming part of said housing positioned between said first and second pole rings, a condensate of a material in said housing having a boiling point at the pressure within the housing less than the highest operating temperature of said coil and above the operating temperature of said separating wall with a vapor of said condensate filling the interioR of said housing, and condensate transfer means for bringing said condensate into thermal contact with portions of said coil whereby when said machine is operating and said coil becomes heated condensate contacting said coil vaporizes with the vapor then condensing on a wall of said housing whereby heat is transferred from said coil to said wall.

Claim 3

A rotatable electric machine according to claim 1 having in addition bearing means within said housing for rotatably supporting said rotor and said first pole ring and wherein said condensate is a lubricant for said bearing means.

Claim 4

A rotatable electric machine according to claim 1 wherein said separating wall is in thermal contact with a region of lower temperature than the operating temperature of said coil whereby said separating wall will act as a condenser for said vapor.

Claim 5

A rotatable electric machine according to claim 3 wherein said condensate transfer means comprises an absorbant body extending from a region adjacent said separating wall to a region adjacent said coil whereby said condensate is moved by capillary action from said separating wall into thermal contact with said stator.

Claim 6

A rotatable electric machine comprising a stator, rotor means, a hermetically sealed housing enclosing said stator and said rotor means, a pole ring exterior of said housing and adapted for rotation, a magnetically pervious wall forming a part of said housing separating said pole ring from the interior of said housing, said rotor means including means which upon rotation creates a field and magnetic couple for driving said pole ring, a condensate of an electrically nonconductive fluid material in said housing and where a vapor of said fluid material may substantially fill the interior of said housing, a wall region of said housing adapted to act as a condenser means for said vapor, and a condensate transfer means for conveying said condensate from said wall region to said stator, said fluid material having a boiling point at the pressure existing within said housing below the highest permissible operating temperature to which said stator may be subjected and which is above the temperature of said wall region whereby when said machine is operating and said stator becomes heated, condensate conveyed to said stator by said condensate transfer means will be vaporized with the vapor then condensing on said wall region whereby heat from said stator is conveyed to said wall region.

Claim 7

A rotatable electric machine comprising a stator, rotor means, a hermetically sealed housing enclosing said stator and said rotor means, a pole ring exterior of said housing and adapted for rotation, a magnetically pervious wall forming a part of said housing separating said pole ring from the interior of said housing, said rotor means including means which upon rotation creates a field and magnetic couple for driving said pole ring, a condensate of an electrically nonconductive fluid material in said housing and where a vapor of said fluid material may substantially fill the interior of said housing, a wall region of said housing adapted to act as a condenser means for said vapor, and a condensate transfer means for conveying said condensate from said wall region to said stator, said fluid material having a boiling point at the pressure existing within said housing below the highest permissible operating temperature to which said stator may be subjected and which is above the temperature of said wall region whereby when said machine is operating and said stator becomes heated, condensate conveyed to said stator by said condensate transfer means will be vaporized with the vapor then condensing on said wall region whereby heat from said stator is conveyed to said wall region.

Claim 8

A rotatable electric machine acording to claim 5 wherein said wall region comprises said separating wall and is in thermal contact with a region of lower temperature than the operating temperature of said stator whereby said separating wall will act as a condenser for said vapor.

Claim 9

A rotatable electric machine according to claim 6 wherein said condensate transfer means comprises an absorbant body extending from an area adjacent said separating wall to an area adjacent said stator whereby said condensate is moved by capillary action from said separating wall into thermal contact with said stator.