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WO2001065664A1 - Dispositif de fixation d'un enroulement electrique - Google Patents

Dispositif de fixation d'un enroulement electrique Download PDF

Info

Publication number
WO2001065664A1
WO2001065664A1 PCT/SE2001/000443 SE0100443W WO0165664A1 WO 2001065664 A1 WO2001065664 A1 WO 2001065664A1 SE 0100443 W SE0100443 W SE 0100443W WO 0165664 A1 WO0165664 A1 WO 0165664A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
slot
winding
spring member
core
Prior art date
Application number
PCT/SE2001/000443
Other languages
English (en)
Inventor
Göran Holmström
Lars Hedendahl
Lars Walfridsson
Original Assignee
Abb Ab
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 Abb Ab filed Critical Abb Ab
Priority to AU2001236321A priority Critical patent/AU2001236321A1/en
Publication of WO2001065664A1 publication Critical patent/WO2001065664A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • H02K3/487—Slot-closing devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/15—Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables

Definitions

  • the present invention relates to a device for securing an electrical winding of flexible cable in a slot in a core of an electrical machine and to an electrical machine having such a winding,
  • the cable thus comprises substantially only the electrical conductor and at least one semiconducting layer on each side of the insulating layer.
  • the stator When manufacturing the winding for such a stator, the stator is usually provided with mainly closed slots, the cable being drawn through the slots.
  • the slots for the stator winding in the stator core must also be made very deep to ensure sufficient space for the required number of winding turns in the slot, and this in turn leads to the teeth that separate the slots becoming very long.
  • the stator winding is composed of a cable with considerably smaller diameter than the winding in a machine for high voltage and high power.
  • a generator for wind power plants of the type described for instance, in international patent applications SE99/00943 and SE99/00944 and in published international application WO99/28919, the generator is driven directly and operates at very low speed, 10-25 rpm, which in turn means that it must be designed with a large number of poles. Many poles result in large diameter and thus high weight.
  • the Swedish patent application No. 0000695-7 filed simultaneously with the present application describes an arrangement in which the stator slots are formed as open double slots into which the cable winding is inserted. However, in such winding slots the finished winding must be secured in the slots.
  • GB 1 135 242 describes an arrangement for securing wind- ings in stator slots of electrical machines. Constructions are shown with inflatable hoses or homogenous packing elements arranged between the winding stack and a locking wedge that engages the wall of the stator slot. Such inflatable hoses or packing elements are also shown arranged between winding stacks and one slot wall.
  • the stator windings in conventional machines are dimensioned for high current and low voltage. Since the force that occurs between two electrical conductors is proportional to the current squared it will be understood that the large currents in conventional windings also give rise to extremely large mechanical forces.
  • the above-mentioned British patent specification describes measures for coming to grips with the large radial forces produced by the stator currents on the windings in the stator slots, and means for securing them.
  • the current in the winding is extremely low in comparison with conventional machines, and the mechanical current forces exerted on the windings in the slots are thus also extremely low.
  • the winding is much more sensitive to outer mechanical damage which can result in electrical flashover, than windings of conventional type.
  • electrical machines having such windings of cable with semiconducting layers to enclose the electrical field inserted in slots in the machine core it is therefore extremely important that the device for securing the winding in the slot in no way damages or deforms the cable so that injurious field concentrations can occur.
  • the object of the present invention is to provide a simple device for secur- ing windings in open slots whereby the problem discussed above is eliminated, and which device is consequently suitable for securing a cable winding in an open slot in the machine core.
  • the object of the invention is also to provide an electrical machine of the type in question with such a securing device. This object is achieved with a device and an electric machine of the type described in the introduction, with the characterising features defined in claim 1 and claim 7, respectively.
  • a securing device at the slot opening in accordance with the present invention also prevents the occurrence of vibrations in the teeth separating the slots in a stator.
  • the cable comprises an insulation system surrounding the conducting core, with two semiconducting layers applied one on each side of a solid layer of insulation, which semiconducting layers constitute substantially equi- potential surfaces.
  • the electrical field is thus confined and the outer surface of the cable can be kept at substantially earth potential.
  • Figure 1 shows a cross-sectional view of a cable suitable for use in the cable-wound machine in question
  • Figs. 2 and 3 show embodiments of the device in accordance with the invention.
  • the invention relates to cable-wound rotating electrical machines.
  • the cable 1 forming the windings of the machine is shown in cross section in Figure 1 and constitutes a high-voltage cable of substantially the same type as those used for power distribution, i.e. PEX cables.
  • the high-voltage cable 1 comprises a conducting core with a plurality of strands 2.
  • the conductor is surrounded by an insulation system having two semiconducting layers 3, 5 applied one of each side of a solid layer of insulation 4.
  • the cable is flexible and the semiconducting layers 3, 5 comprise substantially equipotential surfaces. This enables the electrical field to be confined so that the outer surface of the cable can be kept at substantially earth potential - an extremely important feature when using cable as windings in the iron core of an electrical machine.
  • the solid insulation 4 and the semiconducting layers 3, 5 enclosing it have an electrical insulating strength exceeding 3 kV/mm, preferably exceeding 5 kV/mm.
  • the cable is thus eminently suitable for use as winding in a stator core for high voltages, while still maintaining control of the electrical field and without risk of destructive electrical partial discharges, PD, occurring.
  • Figure 2 shows a cable winding in a double slot in the stator core of an electrical machine.
  • the winding is formed by a number of cables 20, 22, 26, ...34, inserted through the opening of a slot of special design to retain cables inserted one after the other during the winding process, by means of self-locking.
  • This type of winding is described more fully in the above-mentioned Swedish patent application No. 0000695-7 filed simultaneously with the present application.
  • FIG. 2 shows one embodiment of a securing device in the form of a spring member 36 which is in contact with the last-inserted cable 34 and is secured by means of a locking wedge 38 arranged in the slot opening and engaging the slot wall.
  • the spring member comprises a sandwich construction of a wave-formed spring element 40, compressed by two opposing wedges 42.
  • the wave-formed spring element of the spring member 36 is shaped with its wave form running transversely across the slot. When it is compressed upon driving in the opposing wedges, therefore, it will expand substantially in the direction of the wave form.
  • FIG 3 shows an alternative embodiment with a spring member 36 in the form of a cellular plastic plate 44 arranged in contact with the last-inserted cable 34.
  • this cellular plastic plate 44 is secured with a locking wedge 38 in engagement with the slot walls at the opening of the slot. The winding will thus be firmly clamped in the slot by the cellular plastic plate 44, the latter normally being compressed somewhat upon driving in the wedge 38.
  • the cable described may have a diameter of between 16 and 25 mm and preferably be dimensioned for a voltage level of between 10 and 50 kV.
  • the securing device in accordance with the invention is suitable for use in a directly driven generator in a wind power plant, with a power exceeding 1 MW, preferably exceeding 1.5 MW, and most preferably between 3 and 6 MW, but is not limited thereto. It can also be used in motors driven with considerably higher power, within the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

L'invention concerne un dispositif destiné à fixer un enroulement d'un câble électrique souple (20, 22, 26, 34) dans une encoche ouverte d'une armature d'une machine électrique tournante, un élément ressort (36) étant appliqué sur l'ouverture de l'encoche et en contact avec le dernier enroulement de câble (34) inséré dans l'encoche. L'élément ressort est fixé tout en étant déformé de manière résiliente par une cale de verrouillage (38) engageant la paroi de l'encoche et qui bute contre le côté de l'élément ressort placé à l'opposé du câble. L'élément ressort est aussi conçu de façon que la force de compression, s'exerçant dans la direction radiale de l'encoche contre le dernier enroulement de câble, et due à la déformation résiliente, soit inférieure à la force qui provoquerait une déformation préjudiciable au câble.
PCT/SE2001/000443 2000-03-01 2001-03-01 Dispositif de fixation d'un enroulement electrique WO2001065664A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001236321A AU2001236321A1 (en) 2000-03-01 2001-03-01 Device for securing an electrical winding

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0000696-5 2000-03-01
SE0000696A SE0000696L (sv) 2000-03-01 2000-03-01 Anordning för låsning av en elektrisk lindning

Publications (1)

Publication Number Publication Date
WO2001065664A1 true WO2001065664A1 (fr) 2001-09-07

Family

ID=20278671

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/000443 WO2001065664A1 (fr) 2000-03-01 2001-03-01 Dispositif de fixation d'un enroulement electrique

Country Status (3)

Country Link
AU (1) AU2001236321A1 (fr)
SE (1) SE0000696L (fr)
WO (1) WO2001065664A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949255A (en) * 1972-07-11 1976-04-06 Reyrolle Parsons Limited Dynamo-electric machines
JPS6091835A (ja) * 1983-10-21 1985-05-23 Toshiba Corp 回転電機
FR2559967A1 (fr) * 1984-02-17 1985-08-23 Sarelem Cale d'encoche biaise
JPS61142946A (ja) * 1984-12-13 1986-06-30 Mitsubishi Electric Corp 回転電機の固定子巻線の固定方法
WO1997045938A1 (fr) * 1996-05-29 1997-12-04 Asea Brown Boveri Ab Machine electrique tournante comprenant un enroulement de stator haute tension et un dispositif faisant ressort portant l'enroulement et son procede de production

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949255A (en) * 1972-07-11 1976-04-06 Reyrolle Parsons Limited Dynamo-electric machines
JPS6091835A (ja) * 1983-10-21 1985-05-23 Toshiba Corp 回転電機
FR2559967A1 (fr) * 1984-02-17 1985-08-23 Sarelem Cale d'encoche biaise
JPS61142946A (ja) * 1984-12-13 1986-06-30 Mitsubishi Electric Corp 回転電機の固定子巻線の固定方法
WO1997045938A1 (fr) * 1996-05-29 1997-12-04 Asea Brown Boveri Ab Machine electrique tournante comprenant un enroulement de stator haute tension et un dispositif faisant ressort portant l'enroulement et son procede de production

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Also Published As

Publication number Publication date
SE0000696L (sv) 2001-09-02
AU2001236321A1 (en) 2001-09-12
SE0000696D0 (sv) 2000-03-01

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