Cooling arrangement for a squirrel cage rotor assembly

Claim 2

A cooling arrangement for a squirrel cage rotor assembly of an induction drive motor, comprising: A rotatable shaft including an axial bore; a first and a second series of radial passages extending from said axial bore at opposite ends of said shaft; a third series of radial passages extending from said axial bore axially intermediate said first and said second series of radial passages; a laminated core carried by said shaft axially between said first and said second series of radial passages including a series of conductor bars terminated by a pair of conductive end rings extending axially from the ends of said rotor core; a pair of annular end plates carried by said shaft and circumferentially clamped to the ends of said rotor core for forming annular cooling cavities circumscribing the inner peripheries of said pair of conductive end rings in communication with said first and second series of radial passages so that a flow of coolant is directed in heat transferring relationship with said pair of conductive end rings; passage means in further communication with said annular cooling cavities and with said third series of radial passages for directing a flow of coolant therebetween; and a tube member concentrically mounted in said axial bore of said shaft and having the inner wall fluidly connected to said third series of radial passages thereby defining separate concentric flow paths in said axial bore in which one path directs an entering flow of coolant between said axial bore and said first and second series of radial passages and another path direCts a discharge flow of coolant between said third series of radial passages and the inner wall of said tube member, whereby a continuous flow path is provided through said squirrel cage rotor assembly for transferring heat to a circulating flow of coolant.

Claim 3

A cooling arrangement for a squirrel cage rotor assembly of an induction drive motor, comprising: a rotatable shaft including an axial bore; a first and a second series of radial passages extending from said axial bore at opposite ends of said shaft; a third series of radial passages extending from said axial bore axially intermediate said first and said second series of radial passages; a laminated core carried by said shaft axially between said first and said second series of radial passages including a series of conductor bars terminated by a pair of conductive end rings extending axially from the ends of said rotor core; a pair of annular end plates carried by said shaft and circumferentially clamped to the ends of said rotor core for forming annular cooling cavities circumscribing the inner peripheries of said pair of conductive end rings in communication with said first and second series of radial passages so that a flow of coolant is directed in heat transferring relationship with said pair of conductive end rings; passage means in further communication with said annular cooling cavities and with said third series of radial passages for directing a flow of coolant therebetween; a hollow insert having first side portions sealingly supported by the wall of said axial bore and second side portions spaced from the wall of said axial bore for forming divided flow paths between the ends of said axial bore, said hollow insert including transverse holes extending through said first side portions and fluidly connected with said third series of radial passages and further including an axial blind hole extending from one axial end of said hollow insert and communicating with said transverse holes; and a tube member extending concentrically within said axial bore and sealingly supported at one end in said axial blind hole so as to be fluidly connected with said transverse holes whereby separate concentric flow paths are formed for directing an entering flow of coolant between the said axial bore and said first and second series of radial passages and for discharging a flow of coolant between said third series of radial passages and said tube member so that a continuous flow path is provided through said squirrel cage rotor assembly for transferring heat to a circulating flow of coolant.

Claim 4

A cooling arrangement for a squirrel cage rotor assembly of an induction drive motor, comprising: a rotatable shaft including an axial bore; a first and a second series of radial passages extending from said axial bore at opposite ends of said shaft; a third series of radial passages extending from said axial bore axially intermediate said first and said second series of radial passages; a laminated core carried by said shaft axially between said first and said second series of radial passages including a series of conductor bars terminated by a pair of conductive end rings extending axially from the ends of said rotor core; a pair of annular end plates carried by said shaft and circumferentially clamped to the ends of said rotor core for forming annular cooling cavities circumscribing the inner peripheries of said pair of conductive end rings in communication with said first and second series of radial passages so that a flow of coolant is directed in heat transferring relationship with said pair of conductive end rings; passage means in further communication with said annular cooling cavities and with said third series of radial passages for directing a flow of coolant therebetween; a hollow insert having first side portions sealingly supported by the wall of said axial bore and second side portions spaced from the wall of said axial bore for forming divided flow paths between the ends of said axial bore, said hollow insert including transverse holes extending through said first side portions and fluidly connected with said third series of radial passages and further including an axial blind hole extending from one axial end of said hollow insert and communicating with said transverse holes; and a tube member extending concentrically within said axial bore and sealingly supported at one end in said axial blind hole so as to be fluidly connected with said transverse holes whereby separate concentric flow paths are formed for directing an entering flow of coolant between the said axial bore and said first and second series of radial passages and for discharging a flow of coolant between said third series of radial passages and said tube member so that a continuous flow path is provided through said squirrel cage rotor assembly for transferring heat to a circulating flow of coolant.

Claim 5

A cooling arrangement for a squirrel cage rotor assembly of an induction drive motor, comprising: a rotatable shaft including an axial bore; a first and a second series of radial passages extending from said axial bore at opposite ends of said shaft; a third series of radial passages extending from said axial bore axially intermediate said first and said second series of radial passages; a laminated core carried by said shaft axially between said first and said second series of radial passages including a series of conductor bars terminated by a pair of conductive end rings extending axially from the ends of said rotor core; a pair of annular end plates carried by said shaft and circumferentially clamped to the ends of said rotor core for forming annular cooling cavities circumscribing the inner peripheries of said pair of conductive end rings in communication with said first and second series of radial passages so that a flow of coolant is directed in heat transferring relationship with said pair of conductive end rings; passage means fluidly connecting said annular cooling cavities and said third series of radial passages for directing a flow of coolant therebetween; a pair of flow diverter plates extending radially within said annular cooling cavities defining first radial spaces communicating with said first and second radial passages and said inner peripheries of said pair of conductive end rings, and further defining second radial spAces communicating with said inner peripheries of said pair of conductive end rings and said passage means; and a tube member concentrically mounted in said axial bore of said shaft and having the inner wall fluidly connected to said third series of radial passages thereby defining separate concentric flow paths for directing an entering flow of coolant between said axial bore and said first and second series of radial passages and a discharge flow of coolant between said third series of radial passages and the inner wall of said tube member whereby a continuous flow path is provided through said squirrel cage rotor assembly for transferring heat to a circulating flow of coolant.

Claim 6

A cooling arrangement for a squirrel cage rotor assembly of an induction drive motor, comprising: a rotatable shaft including an axial bore; a first and a second series of radial passages extending from said axial bore at opposite ends of said shaft; a third series of radial passages extending from said axial bore axially intermediate said first and said second series of radial passages; a laminated core carried by said shaft axially between said first and said second series of radial passages including a series of conductor bars terminated by a pair of conductive end rings extending axially from the ends of said rotor core; a pair of annular end plates carried by said shaft and circumferentially clamped to the ends of said rotor core for forming annular cooling cavities circumscribing the inner peripheries of said pair of conductive end rings in communication with said first and second series of radial passages so that a flow of coolant is directed in heat transferring relationship with said pair of conductive end rings; passage means fluidly connecting said annular cooling cavities and said third series of radial passages for directing a flow of coolant therebetween; a pair of flow diverter plates extending radially within said annular cooling cavities defining first radial spaces communicating with said first and second radial passages and said inner peripheries of said pair of conductive end rings, and further defining second radial spAces communicating with said inner peripheries of said pair of conductive end rings and said passage means; and a tube member concentrically mounted in said axial bore of said shaft and having the inner wall fluidly connected to said third series of radial passages thereby defining separate concentric flow paths for directing an entering flow of coolant between said axial bore and said first and second series of radial passages and a discharge flow of coolant between said third series of radial passages and the inner wall of said tube member whereby a continuous flow path is provided through said squirrel cage rotor assembly for transferring heat to a circulating flow of coolant.

Claim 7

A cooling arrangement for a squirrel cage rotor assembly of an alternating current induction motor, comprising: a cylindrical rotor core including a mounting bore and a circumferential series of winding slots adjacent the outer diameter carrying conductor bars terminated by a pair of axially extending conductive end rings circumferentially disposed on the ends of said rotor core; a rotatable shaft carrying said mounting bore of said rotor core and including an axial bore extending from an opening at one end of said shaft and terminating within said shaft adjacent the other end; a circumferential series of axial cooling channels extending on the outer surface of said shaft between the ends of said rotor core in heat transferring relationship with inner axial portions of said rotor core; first and second series of radial passages extending between said axial bore and the ends of said rotor core; a third series of radial holes extending between said axial cooling channels and said axial bore; a pair of annular end plates carried by said shaft including outer radial portions axially engaging the ends of said rotor core around the outer diameter thereof for supporting said pair of conductive end rings; a pair of annular cooling cavities extending axially between inner radial side sections of said pair of annular end plates and the ends of said rotor core and circumscribing the inner peripheries of said pair of conductive end rings; a pair of flow diverter plates disposed within said pair of annular cooling cavities including outer axial sides engaging said inner radial side sections of said pair of annular end plates and inner axial sides engaging the ends of said rotor core and further including a plurality of circumferentially spaced radial grooves on both axial sides with the grooves on said outer axial sides communicating with said first and second series of radial passages and the grooves on said inner axial sides communicating with opposite ends of said axial cooling channels. Whereby a circuitous flow of liquid coolant is directed through said pair of annular cooling cavities in heat transferring relationship with said pair of conductive end rings and the ends of said rotor core; a hollow insert including interconnected axial and transverse holes extending therein, said hollow insert further including first side portions sealingly engaging the wall of said axial bore adjacent said third series of radial passages for fluidly connecting said transverse holes with said third series of radial passages and second side portions spaced from the wall of said axial bore to form divided flow paths for directing a flow of liquid coolant between the ends of said axial bore; and a tube member concentrically mounted in said axial bore including an inner end sealingly supported by said axial hole of said hollow insert for fluidly connecting said tube member and said third series of radial holes, said tube member further including an outer end extending to said opening at said one end of said shaft for forming a pair of concentric passages within said axial bore, whereby an entering flow of coolant is directed between said axial bore and said first and second series of radial passages and a discharge flow of coolant is directed between said third series of radial passages and said tube member so that a continuouS flow path is provided for circulating a flow of liquid coolant from said one end of said shaft.

Claim 8

A cooling arrangement for a squirrel cage rotor assembly of an alternating current induction motor, comprising: a cylindrical rotor core including a mounting bore and a circumferential series of winding slots adjacent the outer diameter carrying conductor bars terminated by a pair of axially extending conductive end rings circumferentially disposed on the ends of said rotor core; a rotatable shaft carrying said mounting bore of said rotor core and including an axial bore extending from an opening at one end of said shaft and terminating within said shaft adjacent the other end; a circumferential series of axial cooling channels extending on the outer surface of said shaft between the ends of said rotor core in heat transferring relationship with inner axial portions of said rotor core; first and second series of radial passages extending between said axial bore and the ends of said rotor core; a third series of radial holes extending between said axial cooling channels and said axial bore; a pair of annular end plates carried by said shaft including outer radial portions axially engaging the ends of said rotor core around the outer diameter thereof for supporting said pair of conductive end rings; a pair of annular cooling cavities extending axially between inner radial side sections of said pair of annular end plates and the ends of said rotor core and circumscribing the inner peripheries of said pair of conductive end rings; a pair of flow diverter plates disposed within said pair of annular cooling cavities including outer axial sides engaging said inner radial side sections of said pair of annular end plates and inner axial sides engaging the ends of said rotor core and further including a plurality of circumferentially spaced radial grooves on both axial sides with the grooves on said outer axial sides communicating with said first and second series of radial passages and the grooves on said inner axial sides communicating with opposite ends of said axial cooling channels. Whereby a circuitous flow of liquid coolant is directed through said pair of annular cooling cavities in heat transferring relationship with said pair of conductive end rings and the ends of said rotor core; a hollow insert including interconnected axial and transverse holes extending therein, said hollow insert further including first side portions sealingly engaging the wall of said axial bore adjacent said third series of radial passages for fluidly connecting said transverse holes with said third series of radial passages and second side portions spaced from the wall of said axial bore to form divided flow paths for directing a flow of liquid coolant between the ends of said axial bore; and a tube member concentrically mounted in said axial bore including an inner end sealingly supported by said axial hole of said hollow insert for fluidly connecting said tube member and said third series of radial holes, said tube member further including an outer end extending to said opening at said one end of said shaft for forming a pair of concentric passages within said axial bore, whereby an entering flow of coolant is directed between said axial bore and said first and second series of radial passages and a discharge flow of coolant is directed between said third series of radial passages and said tube member so that a continuouS flow path is provided for circulating a flow of liquid coolant from said one end of said shaft.