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US3487243A - Turbogenerator with internal liquid cooling of exciter winding - Google Patents

Turbogenerator with internal liquid cooling of exciter winding Download PDF

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Publication number
US3487243A
US3487243A US676775A US3487243DA US3487243A US 3487243 A US3487243 A US 3487243A US 676775 A US676775 A US 676775A US 3487243D A US3487243D A US 3487243DA US 3487243 A US3487243 A US 3487243A
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US
United States
Prior art keywords
rotor
cooling
winding
turbogenerator
rods
Prior art date
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
US676775A
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English (en)
Inventor
Eugen Wiedemann
Rolf-Dieter Kranz
Werner Sark
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.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
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BBC Brown Boveri France SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
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Publication of US3487243A publication Critical patent/US3487243A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/22—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors consisting of hollow conductors

Definitions

  • liquid cooling lines extending axially outside of the rotor body and under the end caps for the entire length of the winding heads, these lines being connected into the liquid cooling 4system provided for the exciter winding.
  • the present invention relates to turbogenerators of the type wherein the exciter winding on the rotor is internally, i.e. directly cooled by means of a liquid coolant flowed through the winding, and 'which provides for an improved arrangement for removing lost heat at the surface of the rotor and at the end caps.
  • the present invention relates to a turbogenerator with exciter winding directly cooled with liquid and without gas renewal in the air gap, where the lost heat at the surface of the rotor and at the rotor end caps is removed in a very simple and eifective manner.
  • this is achieved in that above the exciter conductors in the rotor grooves, axial cooling lines are provided, Which extend outside the rotor body and under the rotor end caps for the entire length of the winding head and are connected to the cooling system provided for liquid cooling of the exciter winding.
  • FIGS. l and 2 sho-w the ro-tor of a turbogenerator for each embodiment partially in longitudinal section, while the corresponding liquid cooling system is illustrated schematically in FIGS. 3 and 4.
  • FIGS. 5 and 6 each show a transverse section through a rotor groove.
  • FIG. 1 where for the sake of simplicity only the parts required for comprehension of the invention are shown, 1 denotes the rotor and 2 the exciter winding, which is cooled directly and internally with a liquid, for example water.
  • a liquid for example water.
  • each rotor end is provided with a flying rotor cap consisting of a ring 4 which is shrink-tted on the one hand onto the rotor body 1, and on the other hand, is firmly connected with an annular end plate 5 by a shrink t.
  • the conductors in winding heads 3 communicate via the conduits 6 with a water distribution chamber 7 which is subdivided into several tangential sub-chambers.
  • connections of the conduits 6 to the chamber 7 can be bushed to electrically insulate them from each other.
  • These sub-chambers are connected in known manner via radially extending pipe sections to concentric channels provided in the rotor shaft, which channels serve to supply and remove the cooling water.
  • a cylindrical air gap established by a sleeve 10 is provided, so that the pressure in the rotor zone located inwardly of sleeve 10 can be reduced in relation to the external atmosphere in order to reduce the friction losses very substantially.
  • hollow rods 11, 11 are provided in the rotor grooves which extend outside the rotor iron 1 and under the rotor cap rings 4 for the full length of the Winding heads 3.
  • these hollow rods extend from one end of the rotor winding to the other, including the end caps.
  • the hollow rods 11 communicate with each other via a tangentially subdivided annular line or manifold 12 and are fed with cooling water from the water distribution chamber 7 via inow pipe sections 13.
  • the hollow cooling -rods 11 are also the hollow cooling rods 11 serving for the return flow of the cooling liquid communicate with each other. The cooling liquid thus flows back through these cooling rods 11 to the respective parts of the annular line 12 and thence via the outflow pipe sections 13 to the Water distribution chamber 7.
  • annular line 12 is subdivided inthe present case into four equal sectors, two each serving to supply and to remove cooling liquid.
  • several pipe line sections 13, 13 may be provided per sector.
  • 16 is indicated the subdivision of the distribution chamber 7.
  • the rotor is legended 1', the rotor exciter Winding 2', and the winding heads 3.
  • the winding heads 3 are held by a rotor cap for each, consisting of a cap ring 4' and an end plaie S', and communicate via the conduits 6 with a tangentially subdivided water distribution chamber 7'.
  • the cooling water supply from the distribution chamber 7 occurs via conduits 21 of magnetic material which are placed into the pole zone in the active rotor iron and open into an annular line 22 on the drive side of the rotor, from whence all hollow rods 2t) are fed with cooling liquid.
  • the cooling rods 20 likevwise communicate with an annular line 23, subdivided for example into two sectors, which in turn communicate through pipe sections 24 with the outflow portion of the annular chamber 7.
  • the annular lines 22, 23 can be divided at most into as many sectors as there are pipe connections 21, 24.
  • the cooling rods 11, 11 (FIG. 1) or respectively 20 (FIG. 2) need not be fed with cooling liquid via electrical insulation members, it is possible to solder or weld the cooling rods at the end directly to an annular line which latter requires only a relatively small number of pipe connections for communication with the distribution chamber arranged outside the rotor cap. The result of this is that any weakening of the distribution chamber wall is much less than what would be the case were each cooling rod to be connected individually with the distribution chamber 7.
  • FIGS. 5 and 6 illustrate in transverse section two forms of construction of the hollow cooling rods which, according to the invention, are provided for the removal of the lost heat at the surface of the groove wedges and at the tooth surface.
  • the hollow cooling rod inserted in the groove between the exciter conductors 2 and the Wedge 30 located at the entrance to the groove is legended 31 and consists, for example, of copper. Since it is obvious that the hollow cooling rods 31, correspondingly numbered 11, 11 and 20 in FIGS. l and 2 do not form part of the exciter winding conductors 2, i.e. they are independent of such winding, they are not required to be insulated. This is obvious from the detailed views in FIGS. 5 and 6 where there is a direct heat transfer path to the bare, i.e. uninsulated hollow rod 31 through the wedges 32 from the rotor iron.
  • wedge-shaped pieces 32 are fitted on both sides of the cooling rod into corresponding recesses; they apply against the groove wall and against the cooling rod by inherent centrifugal force.
  • the recesses for the wedge-shaped pieces 32 are provided in the cooling conductor 31 itself, and in FIG. 6, in the groove wall.
  • the embodiment according to FIG. 6 is used when the area within the cooling rod provided for flow of cooling lmedium is large and not enough cross section of the rod remains to resist the pressure exerted by the centrifugal force of the groove filling.
  • Good heat transfer from the tooth directly into the cooling rod is of particular advantage especially when the wedge is made of non-magnetic steel and has a low conductivity.
  • cooling rods 31 are made, for example, of stainless steel, it is advantageous to provide a damper rod 33 between the cooling rods 31 and the groove Wedge 30, as indicated in FIG. 5.
  • cooling rods communicate with each other on the drive end of said rotor via a common annular manifold provided in the Zone of the corresponding winding head and which is fed directly with liquid coolant from the inflow side of the cooling system for said exciter winding via conduits inserted in the pole zone of said rotor, and wherein said cooling rods also communicate with each other at the other end of said rotor by another annular manifold which is connected through pipe sections with the outflow side of the cooling system provided for exciter winding.
  • cooling rods consist of stainless steel and wherein a damper rod is placed between the cooling rod and the wedge element which closes off the entrance to the rotor groove.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Filtration Of Liquid (AREA)
US676775A 1966-10-27 1967-10-20 Turbogenerator with internal liquid cooling of exciter winding Expired - Lifetime US3487243A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1559566A CH453483A (de) 1966-10-27 1966-10-27 Turbogenerator mit direkt mit Flüssigkeit gekühlter Erregerwicklung im Rotor

Publications (1)

Publication Number Publication Date
US3487243A true US3487243A (en) 1969-12-30

Family

ID=4410408

Family Applications (1)

Application Number Title Priority Date Filing Date
US676775A Expired - Lifetime US3487243A (en) 1966-10-27 1967-10-20 Turbogenerator with internal liquid cooling of exciter winding

Country Status (7)

Country Link
US (1) US3487243A (de)
AT (1) AT270793B (de)
CH (1) CH453483A (de)
DE (2) DE1993608U (de)
GB (1) GB1202261A (de)
NO (1) NO120693B (de)
SE (1) SE341215B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582977A (en) * 1969-03-13 1971-06-01 Parsons & Co Ltd C A Dynamoelectric machines
US4010394A (en) * 1974-01-11 1977-03-01 The English Electric Company Limited Support for an end winding of a rotor of a dynamo-electric machine
US4063122A (en) * 1974-04-16 1977-12-13 Siemens Aktiengesellschaft Rotor containing a field winding cooled to a low temperature
US4206378A (en) * 1978-02-14 1980-06-03 Westinghouse Electric Corp. System for liquidly cooling dynamoelectric machine rotor coils
US4375823A (en) * 1980-03-10 1983-03-08 Bbc Brown, Boveri & Company, Limited Water distributor
US4890028A (en) * 1981-11-19 1989-12-26 Asea Aktiebolag Rotor for a turbo-generator
US20120112569A1 (en) * 2010-11-04 2012-05-10 Jean Le Besnerais Magnetic Cap Element for a Stator of a Generator

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034003A (en) * 1958-10-11 1962-05-08 Seidner Mihaly Liquid cooled rotors for turbo-alternators
US3075104A (en) * 1960-04-22 1963-01-22 Gen Electric Liquid-cooled rotor for a dynamoelectric machine
US3154706A (en) * 1962-05-07 1964-10-27 Parsons C A & Co Ltd Cooling of rotor conductors of dynamo-electric machines
US3214617A (en) * 1961-12-01 1965-10-26 Ass Elect Ind Dynamo-electric machines
US3249775A (en) * 1961-11-30 1966-05-03 Baylac Marcel Liquid-circulation cooling device for the rotors of high-power turbo-alternators rotating at high speed
US3395299A (en) * 1965-09-16 1968-07-30 Gen Electric Downset end winding rotor for dynamoelectric machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034003A (en) * 1958-10-11 1962-05-08 Seidner Mihaly Liquid cooled rotors for turbo-alternators
US3075104A (en) * 1960-04-22 1963-01-22 Gen Electric Liquid-cooled rotor for a dynamoelectric machine
US3249775A (en) * 1961-11-30 1966-05-03 Baylac Marcel Liquid-circulation cooling device for the rotors of high-power turbo-alternators rotating at high speed
US3214617A (en) * 1961-12-01 1965-10-26 Ass Elect Ind Dynamo-electric machines
US3154706A (en) * 1962-05-07 1964-10-27 Parsons C A & Co Ltd Cooling of rotor conductors of dynamo-electric machines
US3395299A (en) * 1965-09-16 1968-07-30 Gen Electric Downset end winding rotor for dynamoelectric machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582977A (en) * 1969-03-13 1971-06-01 Parsons & Co Ltd C A Dynamoelectric machines
US4010394A (en) * 1974-01-11 1977-03-01 The English Electric Company Limited Support for an end winding of a rotor of a dynamo-electric machine
US4063122A (en) * 1974-04-16 1977-12-13 Siemens Aktiengesellschaft Rotor containing a field winding cooled to a low temperature
US4206378A (en) * 1978-02-14 1980-06-03 Westinghouse Electric Corp. System for liquidly cooling dynamoelectric machine rotor coils
US4375823A (en) * 1980-03-10 1983-03-08 Bbc Brown, Boveri & Company, Limited Water distributor
US4890028A (en) * 1981-11-19 1989-12-26 Asea Aktiebolag Rotor for a turbo-generator
US20120112569A1 (en) * 2010-11-04 2012-05-10 Jean Le Besnerais Magnetic Cap Element for a Stator of a Generator
US9356491B2 (en) * 2010-11-04 2016-05-31 Siemens Aktiengesellschaft Magnetic cap element for a stator of a generator

Also Published As

Publication number Publication date
SE341215B (de) 1971-12-20
CH453483A (de) 1968-06-14
AT270793B (de) 1969-05-12
GB1202261A (en) 1970-08-12
DE1538725A1 (de) 1969-05-22
NO120693B (de) 1970-11-23
DE1993608U (de) 1968-09-12

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