US3487242A - Liquid cooled rotors for dynamo-electric machines - Google Patents

Liquid cooled rotors for dynamo-electric machines Download PDF

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Publication number
US3487242A
US3487242A US680744A US3487242DA US3487242A US 3487242 A US3487242 A US 3487242A US 680744 A US680744 A US 680744A US 3487242D A US3487242D A US 3487242DA US 3487242 A US3487242 A US 3487242A
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United States
Prior art keywords
rotor
coolant
liquid coolant
liquid
dynamo
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US680744A
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English (en)
Inventor
Philip Richardson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CA Parsons and Co Ltd
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CA Parsons and Co Ltd
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Filing date
Publication date
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator

Definitions

  • FIGS. 1 A first figure.
  • This invention relates to dynamo-electric machines having a liquid cooled rotor.
  • the rotors of dynamo-electric machines and in particular rotors of large turbine driven alternating current generators can be cooled by circulating a liquid coolant through passages in the rotor body and in the rotor windings, the coolant entering and leaving the rotor via passages which are usually located near the axis of rotation of the rotor.
  • the coolant used is water
  • the pressure of the water at the outlet from the rotor, where the coolant temperature is a maximum would in many cases be atmospheric or near atmospheric, in which case it is necessary to keep the outlet temperature below 100 C.
  • the inlet temperature is 40 C.
  • the permissible temperature rise is 60 C.
  • a temperature rise of the order of 90 C. is permissible on an inlet temperature of 40 C. so that the total average temperature of the rotor winding is 130 C. with hot spot temperatures of the order of 140 C.
  • the need to avoid boiling of a liquid coolant can therefore reduce the upper temperature limit at which the rotor winding can operate compared with a gas cooled rotor and this imposes a restriction on the current carrying capacity of the rotor.
  • the effect of centrifugal force in the liquid coolant is to increase its pressure and in the rotor core and winding of a turbine driven alternating current generator, the coolant pressure may be several thousand pounds per square inch. At such pressures the boiling point of the coolant is much higher than at atmospheric pressure, but, as the coolant passes to its outlet near the axis of rotation of the rotor, the effect of centrifugal force is reduced and as mentioned earlier the pressure of the coolant at the outlet usually approaches atmospheric pressure.
  • the object of the present invention is to provide an improved dynamo-electric machine with a liquid cooled rotor having means to avoid boiling of the aforesaid liquid.
  • the invention consists in a dynamo-electric machine having a liquid cooled rotor in which machine means are provided for introducing a supplementary fluid into the coolant circuit at a selected position in said circuit to mix with and reduce the coolant temperature so as to prevent boiling of said coolant.
  • the invention also consists in a machine in accordance with the preceding paragraph in which the supplementary fluid is introduced into the coolant at a position in the coolant circuit between the rotor winding and an outlet from the rotor for said coolant.
  • the invention also consists in a machine in accordance with the preceding paragraph in which ducts for conveying liquid coolant through the rotor winding discharge into at least one header adjacent the end windings and further ducts are provided in the rotor body to convey liquid coolant from said header to a discharge outlet in the shaft of said rotor, the supplementary fluid being introduced into said liquid coolant in said header.
  • the invention also consists in a machine in accordance with either of the preceding two paragraphs in which the supplementary fluid is admitted to the rotor via a duct surrounding an inlet duct for liquid coolant said ducts lying along the axis of rotation of the rotor.
  • the invention also consists in a machine in accordance with any of the preceding four paragraphs in which the supply of supplementary fluid is controlled by valve means operable in response to temperature sensitive means in the coolant circuit.
  • valve means are provided in the liquid coolant circuit and are operable by said temperature sensitive means to control the flow of liquid coolant.
  • the invention also consists in a machine in accordance with any of the preceding six paragraphs in which the supplementary fluid is a liquid.
  • the invention also consists in a machine in accordance with the preceding paragraph in which the liquid coolant and the supplementary fluid are Water.
  • FIGURE 1 is a section through part of a rotor of a turbine driven alternating current generator showing diagrammatically part of a liquid coolant circuit and means for injecting a supplementary fluid in accordance with one embodiment of the invention
  • FIGURE 2 is a section similar to that shown in FIG- URE 1 showing an alternative arrangement for introducing the supplementary fluid
  • FIGURE 3 shows diagrammatically a control arrangement for the liquid coolant and supplementary fluid.
  • one end of the rotor body of a turbine driven alternating current generator is represented in outline at 1.
  • the windings have not been shown (for the sake of simplicity) but they may be of conventional form.
  • the conductors forming the rotor winding, or ducts for coolant circulating in the winding may terminate in one or more headers at one or both ends of the rotor and one such header is shown at 2 with a conductor or duct carrying coolant represented at 3.
  • Liquid coolant for the rotor winding can enter or leave the winding via headers such as header 2 but in the form shown header 2 is an outlet header.
  • Liquid coolant is supplied to the rotor through duct 4 which is coaxial wtih the axis of rotation of the rotor.
  • the liquid coolant flows in duct 4 to the end of the rotor, not shown, or to a place intermediate the rotor ends, where it is conveyed to the rotor winding.
  • Liquid coolant entering the header 2 leaves the rotor via duct 5.
  • a supplementary fluid preferably water is introduced into the coolant in header 2 so as to reduce its temperature and ensure that it is below the boiling point no matter what is the prevailing pressure in the fluid between the header 2 and the outlet from the duct 5.
  • the temperature will be reduced below 100 C. but it may not be necessary to reduce the temperature to this level if the pressure in the coolant remains above atmospheric in duct 5.
  • the water acting as supplementary fluid is introduced to the rotor via a duct 6 which surrounds duct 4 and then is conveyed from duct 6 to header 2 via duct 7.
  • the supplementary fluid is supplied to the rotor via a duct 6 as before but is introduced into the liquid coolant as it flows through duct 5.
  • duct 6 it is not essential for the duct 6 to surround duct 4 as shown. It may lie alongside duct 4 or be spaced therefrom.
  • the supply of supplementary fluid can be controlled by valve means 8 (see FIGURE 3), operable by temperature sensitive device 9 which is positioned at a selected point in the liquid coolant circuit preferably between the rotor winding, indicated diagrammatically at 10, and outlet 11 for the liquid coolant from the rotor.
  • the device 9 acts to admit a desired amount of supplementary fluid should the temperature rise above a predetermined value.
  • the device 9, or a similar device, may also be used to control the flow through the liquid coolant circuit through valve means 12.
  • supplementary fluid as described can be used in rotors where the liquid coolant circuit is initially pressurised so as to obtain an outlet pressure in excess of atmosphere; the use of supplementary fluid in the manner described serving to reduce the degree of initial pressurisation necessary to prevent boiling.
  • a machine as claimed in claim 1 wherein ducts for conveying said liquid coolant through the rotor Winding discharge into at least one header adjacent the end windings, and further ducts are provided in the body of said rotor to convey said liquid coolant from said header to a discharge outlet in a shaft of said rotor, said supplementary fluid beingintroduced into said liquid coolant in said header.
  • a machine as claimed in claim 1 in which said supplementary fluid is admitted to said rotor via a duct surrounding an inlet duct for said liquid coolant, said ducts lying along the axis of rotation of said rotor.
  • a machine as claimed in claim 1 in which the supply of said supplementary fluid is controlled by said additional fluid introduction means which includes a valve means operable in response to temperature sensitive means in said liquid coolant circuit.
  • valve means are provided in said liquid coolant circuit and is operable by said temperature sensitive means to also control the flow of said liquid coolant.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
US680744A 1966-11-09 1967-11-06 Liquid cooled rotors for dynamo-electric machines Expired - Lifetime US3487242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB50184/66A GB1206274A (en) 1966-11-09 1966-11-09 Liquid cooled rotors of dynamo electric machines

Publications (1)

Publication Number Publication Date
US3487242A true US3487242A (en) 1969-12-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US680744A Expired - Lifetime US3487242A (en) 1966-11-09 1967-11-06 Liquid cooled rotors for dynamo-electric machines

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US (1) US3487242A (de)
CH (1) CH473500A (de)
DE (1) DE1613344A1 (de)
GB (1) GB1206274A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3755702A (en) * 1972-07-31 1973-08-28 Gen Electric Flow surge equipment for dynamoelectric machine
US5271248A (en) * 1991-08-23 1993-12-21 Sundstrand Corporation Dual cooling system
CN113285563A (zh) * 2021-06-07 2021-08-20 山东心传矿山机电设备有限公司 一种变频冷却结构、变频冷却方法及变频冷却潜水泵

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131321A (en) * 1962-04-23 1964-04-28 Gen Electric Liquid-cooled rotor for a dynamoelectric machine
US3163790A (en) * 1961-11-10 1964-12-29 Fostoria Corp Motor driven pumps
US3189769A (en) * 1961-08-01 1965-06-15 Gen Electric Dynamoelectric machine rotor cooling
US3353043A (en) * 1965-05-14 1967-11-14 Gen Electric Conductor cooling system for dynamoelectric machine rotor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189769A (en) * 1961-08-01 1965-06-15 Gen Electric Dynamoelectric machine rotor cooling
US3163790A (en) * 1961-11-10 1964-12-29 Fostoria Corp Motor driven pumps
US3131321A (en) * 1962-04-23 1964-04-28 Gen Electric Liquid-cooled rotor for a dynamoelectric machine
US3353043A (en) * 1965-05-14 1967-11-14 Gen Electric Conductor cooling system for dynamoelectric machine rotor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3755702A (en) * 1972-07-31 1973-08-28 Gen Electric Flow surge equipment for dynamoelectric machine
US5271248A (en) * 1991-08-23 1993-12-21 Sundstrand Corporation Dual cooling system
CN113285563A (zh) * 2021-06-07 2021-08-20 山东心传矿山机电设备有限公司 一种变频冷却结构、变频冷却方法及变频冷却潜水泵

Also Published As

Publication number Publication date
CH473500A (de) 1969-05-31
DE1613344A1 (de) 1971-05-19
GB1206274A (en) 1970-09-23

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