WO2018139936A1 - Procédé d'accès interne dans une machine électrique - Google Patents

Procédé d'accès interne dans une machine électrique Download PDF

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Publication number
WO2018139936A1
WO2018139936A1 PCT/NO2018/050020 NO2018050020W WO2018139936A1 WO 2018139936 A1 WO2018139936 A1 WO 2018139936A1 NO 2018050020 W NO2018050020 W NO 2018050020W WO 2018139936 A1 WO2018139936 A1 WO 2018139936A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
stator
machine
wedges
motor
Prior art date
Application number
PCT/NO2018/050020
Other languages
English (en)
Inventor
Adin Maksumic
Original Assignee
Rolls-Royce Marine As
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 Rolls-Royce Marine As filed Critical Rolls-Royce Marine As
Publication of WO2018139936A1 publication Critical patent/WO2018139936A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets

Definitions

  • the present invention relates to a method for internal access in an electric machine comprising a motor housing with a stator and a rotor equipped with permanent magnets.
  • PM motor is a type of brushless electric motor that uses permanent magnets rather than windings in the rotor.
  • Permanent magnet motors for use in anchor-handling operations can be sizeable motors with a large diameter and a considerable torque.
  • An example of such motors can be a motor with an outer diameter of 2 m, power of 1 .4 MW and with a nominal torque of 140 kNm.
  • Assembly procedure of an electric machine such as the PM motor is rather complicated. The same applies to the dismantling.
  • the rotor contains large permanent magnets, and inserting it into the stator is difficult due to high attraction forces between the rotor and the stator. Bearing failure on electrical machines is rather common, so changing bearings may be necessary.
  • WO2007051895 A1 discloses a method for installing a rotor excited by permanent magnets into an electrical machine using a support, the electrical machine including a stator and a rotor.
  • the support contains a shaft supporting the rotor. The rotor is rotated, or the shaft supporting the rotor is rotated, whereupon the rotor is moved to its operating position with the help of mutually corresponding threads arranged on the rotor and the shaft supporting the rotor.
  • EP 2626975 A2 disclose a rotor assembly for a motor in which separation type rotor cores having the other polarity are disposed between core members of integral type rotor cores having one polarity and the separation type rotor cores and the integral type rotor cores are fixed to each other using wedges or injection molding materials that are formed of a non-magnetic material, such that movement of magnetic fluxes between the integral type rotor cores and the separation type rotor core may be minimized.
  • US2015333585 A1 discloses a wedge mechanism including at least one wedge element and a guide member.
  • the guide member is attached to the second assembly and adapted for receiving the wedge element in such a way as to define at least an inactive position and an active position of the mechanism after the mechanism has been received in the guide member.
  • the first and second assemblies can be detached from each other and in the active position one of the wedge element and the guide member presses against two different sectors of the first assembly such that the first assembly and the second assembly remain attached to each other.
  • US2006028083 A1 discloses a rotor using nonmagnetic beams.
  • the rotor includes a magnetic steel rim connected to a main generator shaft by a hub.
  • the magnetic rim supports the components of the rotor, which includes a plurality of magnets and pole pieces.
  • the pole pieces are connected to the rim with non-magnetic standoffs and nonmagnetic fasteners.
  • the magnets are supported radially by nonmagnetic beams.
  • the magnets are retained tangentially by pole pieces and radially by wedges.
  • the components of the rotor are further retained axially between plates coupled to the rim and a shoulder on the pole pieces.
  • a method for internal access in an electric machine comprising a motor housing with a stator and a rotor equipped with permanent magnets, said rotor being connected to a central shaft by bearings, and the motor housing comprises end plates and bearing housing covering said bearings supporting the shaft, wherein the method comprises the following steps: inserting a number of locking wedges through holes in the end plate, and into an air gap between the rotor and the stator; firmly locking the rotor with respect to the stator using said locking wedges in the air gap; and removing the bearing housing for access to internal parts of the machine.
  • the method may further comprise the step of changing the bearing after the bearing housing has been removed.
  • the method may further comprise the step of removing the end plate after the bearing housing has been removed.
  • the method may further comprise the step of servicing internal cooler or other internal parts in the motor after the end plate has been removed.
  • the method may comprise use of non-magnetic locking wedges.
  • the method may comprise the step of inserting non-magnetic locking wedges of decreasing thickness across the length of the wedges, to fit with possible variations in the air gap between the rotor and the stator.
  • the steps of the method may be performed on the drive end side of the motor, or the steps of the method can be performed on the non drive end side of the motor.
  • the steps of the method can be reversed and all the parts be put back into respective positions.
  • the method may comprise the step of covering the wedges with a protective and possible non-magnetic material, such as a rubber covering, to prevent damage to the permanent magnets on the rotor.
  • a protective and possible non-magnetic material such as a rubber covering
  • Figure 1 shows schematically a cross section of a typical permanent magnet motor.
  • the method according to the invention is applicable on all electric machines with magnets on the rotor, motors, generators etc. In the following the method is described in relation to a typical permanent magnet motor.
  • a typical permanent magnet motor 10 comprises a motor housing 12 with a stator 14 and an internal rotor 16. All details about a PM motor are not explained in the present disclosure, as such details are regarded as known to a skilled person.
  • the rotor 16 is supported on a central shaft 24, and the shaft 24 is supported in respective bearings 20 on both sides of the motor housing 12.
  • the bearings 20 are embedded in a bearing housing 22.
  • An end plate 18 is mounted on respective sides of the motor housing 12, and part of the bearing housing 22 covers respective end plates 18. It is therefore normally not possible to remove one of the end plates 18 without removing the bearing housing 22 for internal access to the motor 10.
  • the end plate and the bearing housing may be integrated with each other. In such a case, removing the bearing housing 22 also means removing the end plate 18.
  • the stator 14 is placed internally in the motor housing 12, and is equipped with coils 32.
  • the rotor 16 is equipped radially with magnets 30. During operation of the electric motor 10 torque is transferred to the central shaft 24 for operation of external equipment. Between the stator 14 and the rotor 16 is an air gap 28 formed.
  • Such an electric motor 10 may further comprise a cooling system for cooling the motor.
  • a cooling system for cooling the motor for instance a closed cooling system in the form of a rotor cooling system and a stator cooling system, where the closed rotor cooling system may comprise an internal fan system in the motor housing 12, to force air to flow through the air gap 28 between rotor 16 and stator 14, and the stator cooling system may comprise a cooling jacket in the motor housing 12, and which surrounds the stator 14.
  • Cooling systems will require maintenance at regular intervals. Bearing failure on electrical machines requires changing bearings when necessary. At sea, without proper equipment, such operations may be difficult.
  • the method according to the invention is also applicable on other PM motors.
  • a PM motor with a stationary shaft, and with the outer drum as the rotating part of the motor, in contrast to standard motors, on which the shaft rotates.
  • the permanent magnets are fastened to the inside of the rotor drum, and the electrical windings are in the stationary part.
  • the motor housing will similar as explained above have end plates and bearings for supporting the shaft. The method according to the invention shall now be described. The steps are described performed on the drive end side of the motor 10, but may also be performed on the non drive end side.
  • access holes 26 or apertures are provided in one or both of the end plates 18.
  • the access holes 26 are normally predrilled, but may also be drilled on site.
  • the access holes 26 are preferably provided in a circular pattern on the end plate. It is important that the holes 26 are located where the air gap 28 between the rotor 16 and stator 14 is.
  • a lower wedge 40 is shown partially inserted in the hole 26 in the end plate 18, while an upper wedge 40 is shown fully inserted through the hole 26 and into the air gap 28.
  • the holes 26 are plugged when not in use and the motor is sealed.
  • the bearing housing 22 is thereafter removed.
  • the bearing housing 22 is removed, the rotor 16 is no longer supported in the end plate 18.
  • only the locking wedges 40 prevent the rotor 16 from crashing into the stator 14.
  • Access to the bearing 20 is now possible when the bearing housing 22 has been removed. By pumping up pressure under the bearing 20 and by using standard tools, it is now possible to remove the bearing 20.
  • the cooler is normally bolted to the end plate 18 inside the motor 10.
  • the end plate 18 can now be removed to inspect the cooler.
  • the end plate 18 can thus be removed without any complications.
  • the locking wedges 40 are preferable non-magnetic, as it is convenient to use nonmagnetic wedges since there are permanent magnets on the rotor 16. But the wedges 40 can be of whatever material as long as they can be applied and safely removed afterwards. Thus, the locking wedges 40 may also be magnetic or semi- magnetic wedges.
  • the locking wedges 40 are specially designed. They can be designed with various thickness across the length, to fit with possible variations around the airgap 28. They can be of circular, square or rectangular cross section. Further, the wedges 40 can be covered by a protective and possible non-magnetic material, such as a rubber covering, to prevent damage to the permanent magnets on the rotor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Motor Or Generator Frames (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un procédé d'accès interne dans une machine électrique (10), ladite machine (10) comprenant un carter de moteur (12) avec un stator (14) et un rotor (16) équipé d'aimants permanents, ledit rotor (16) étant relié à un arbre central (24) par des paliers (20), et le carter de moteur (12) comprenant des plaques d'extrémité (18) et un logement de palier (22) recouvrant lesdits paliers (20) supportant l'arbre (24), le procédé comprenant les étapes consistant à : insérer un certain nombre de coins de verrouillage (40) à travers des trous (26) dans la plaque d'extrémité (18), et dans un entrefer (28) entre le rotor (16) et le stator (14) ; verrouiller fermement le rotor (16) par rapport au stator (14) à l'aide desdits coins de verrouillage (40) dans l'entrefer (28) ; et retirer le logement de palier (22) pour accéder à des parties internes de la machine (10).
PCT/NO2018/050020 2017-01-26 2018-01-26 Procédé d'accès interne dans une machine électrique WO2018139936A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20170116A NO341838B1 (en) 2017-01-26 2017-01-26 Method for internal access in an electric machine.
NO20170116 2017-01-26

Publications (1)

Publication Number Publication Date
WO2018139936A1 true WO2018139936A1 (fr) 2018-08-02

Family

ID=61166219

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2018/050020 WO2018139936A1 (fr) 2017-01-26 2018-01-26 Procédé d'accès interne dans une machine électrique

Country Status (2)

Country Link
NO (1) NO341838B1 (fr)
WO (1) WO2018139936A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3320660A (en) * 1962-12-11 1967-05-23 Gen Electric Methods for assembling end shield members in dynamoelectric machines
US4361953A (en) * 1978-10-31 1982-12-07 Emerson Electric Co. Method of securing end shields to the stator assembly of a dynamoelectric machine
US20020047327A1 (en) * 1998-10-05 2002-04-25 Mannesman Vdo Ag Method of assembling an electric motor
WO2009140954A2 (fr) * 2008-05-21 2009-11-26 Innovative Windpower Ag Dispositif de fixation d'un rotor dans une machine électrique
WO2011000376A1 (fr) * 2009-06-30 2011-01-06 Vestas Wind Systems A/S Machine électrique à aimant permanent ayant un système de libération de palier et procédé de remplacement de palier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20051090L (fi) * 2005-10-28 2007-04-29 Abb Oy Menetelmä ja järjestely kestomagneeteilla magnetoidussa sähkökoneessa
US10393089B2 (en) * 2013-04-05 2019-08-27 Oscilla Power Inc. Wave energy converter
KR101310489B1 (ko) * 2012-02-10 2013-09-24 삼성전기주식회사 전동기용 로터 조립체 및 이의 제작방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3320660A (en) * 1962-12-11 1967-05-23 Gen Electric Methods for assembling end shield members in dynamoelectric machines
US4361953A (en) * 1978-10-31 1982-12-07 Emerson Electric Co. Method of securing end shields to the stator assembly of a dynamoelectric machine
US20020047327A1 (en) * 1998-10-05 2002-04-25 Mannesman Vdo Ag Method of assembling an electric motor
WO2009140954A2 (fr) * 2008-05-21 2009-11-26 Innovative Windpower Ag Dispositif de fixation d'un rotor dans une machine électrique
WO2011000376A1 (fr) * 2009-06-30 2011-01-06 Vestas Wind Systems A/S Machine électrique à aimant permanent ayant un système de libération de palier et procédé de remplacement de palier

Also Published As

Publication number Publication date
NO20170116A1 (en) 2018-02-05
NO341838B1 (en) 2018-02-05

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