GB2132419A - Electric motors - Google Patents

Electric motors Download PDF

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Publication number
GB2132419A
GB2132419A GB8236137A GB8236137A GB2132419A GB 2132419 A GB2132419 A GB 2132419A GB 8236137 A GB8236137 A GB 8236137A GB 8236137 A GB8236137 A GB 8236137A GB 2132419 A GB2132419 A GB 2132419A
Authority
GB
United Kingdom
Prior art keywords
frame
stator stack
projection
stack
pushed
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.)
Granted
Application number
GB8236137A
Other versions
GB2132419B (en
Inventor
Hannu Sarvanne
Leo Numminen
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.)
E Sarlin Oy AB
Original Assignee
E Sarlin Oy 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 E Sarlin Oy AB filed Critical E Sarlin Oy AB
Publication of GB2132419A publication Critical patent/GB2132419A/en
Application granted granted Critical
Publication of GB2132419B publication Critical patent/GB2132419B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

An electric motor has a means serving to prevent rotation with reference to the encircling frame (1) of the cylindrical stator stack in which the plates (6) have been bound together by an aluminium shell (7) cast thereupon. The means comprises an axial projection (8) on the shell which as the stator stack is being pushed in place enters an axial groove (9) in the frame (1) to prevent rotation. <IMAGE>

Description

SPECIFICATION Electric motors Several different methods are today used to prevent the cylindrical stator stack of an electric motor from rotating with reference to the surrounding frame.
Shrink mounting is an inexpensive and reliable way to do this, but the drawback is inconvenience experienced when replacing the stack. If a frame made of aluminium is used in circumstances where high temperature differences have to be taken into account, it is nearly impossible with common aluminium grades to find a reliable dimensioning for the shrink mounting because the thermal expansion coefficient of aluminium is higher than that of the stator stack's sheet iron. If a shrink fit is selected which will remain tight even in the hottest condition, one incurs the risk that the frame cracks in cold weather owing to the high shrinkage stresses arising therein.
Securing with a key entails extra costs because a keyway must be machined in the stator stack.
There is moreover a risk that the chips enter the windings if this keyway has to be provided on the ready-wound stack.
Locking with screws entails costs and introduces at least one point susceptible to leakage in motors operating under water.
Clamping in axial direction entails costs, and it is unreliable owing to thermal expansions.
The object of the present invention is therefore a means for preventing rotation with reference to the surrounding frame of an electromotor's cylindrical stator stack in which the plates have been bound together by an aluminium shell cast thereover.
The object of the invention is to provide a more reliable means whichi is free of the drawbacks of design solutions of prior art.
The invention is characterized in that the aluminium shell has an axial projection which enters an axial groove in the frame when the stator stack is pushed into place.
The projection and groove constitute a locking preventing rotation of the stator stack. The means of the invention causes no piece costs at all. The reliable locking enables a less tight locking joint to be used, thus facilitating the stator stack replacement operation.
In a simplified embodiment of the invention, the axial groove is located in an annular stop within the frame, against which the stator stack is axially pushed.
The invention is described in the following with reference made to the attached drawing, wherein Fig. 1 presents an electric motor according to one embodiment, sectioned.
Fig. 2 shows parts of the motor's frame and aluminium shell, seen from within.
In the drawing, the reference numeral 1 indicates the motor frame, 2 the bottom and 3 the cover. The shaft 5 of the rotor 4 has been rotatably carried in the bottom and cover.
As taught by the invention, the stator stack, comprising the plates 6 and the aluminium shell 7 cast thereupon, has been pushed into the frame 1.
During this operation, of course, the cover 3 has been removed. The stator stack 6, 7 has been secured to be unrotatable with reference to the frame 1 owing to the circumstance that the aluminium shell 7 has an axial projection 8 which, as the stator stack is being pushed into place, enters an axial groove 9 in the frame. The axial groove 9 has been provided in an annular stop 10 within the frame 1, against which stop the stator stack is pushed in axial direction.
The projection 8 is preferably produced by casting, simultaneously with the casting of the aluminium shell 7 over the plates 6. Similarly, the groove 9 is most appropriately produced in connection with the casting of the frame 1. It is naturally possible, in addition to the locking constituted by the projection 8 and groove 9, to apply furthermore a shrink mounting between the stator stack 6, 7 amd t frame 1. But this shrink fit may be comparatively loose, thus making replacement of the stator stack easier.
It is obvious to a person skilled in the art that various embodiments of the invention may vary within the scope of the claims stated below. This concerns in particular the shape and size of the projection 8 and groove 9.
Claims
1. In an electric motor, a means for preventing rotation with reference to the surrounding frame (1) of the cylindrical stator stack (6, 7) in which the plates (6) have been bound together by an aluminium shell (7) cast thereupon, characterized in that the aluminium shell (7) has an axial projection (8) which as the stator stack (6, 7) is being pushed in its place enters an axial groove (9) provided in the frame (1).
2. Means according to claim 1, characterized in that the axial groove (9) is located in an annular stop (10) within the frame (1), against which the stator stack (6, 7) is axially pushed.
3. An electric motor comprising a housing, a rotor disposed within the housing, and a stator surrounding the rotor and having a projection adapted to be received in an axial groove of the housing so as to prevent relative rotation between the stator and the housing.
4. An electric motor substantially as herein described with reference to the-accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Electric motors Several different methods are today used to prevent the cylindrical stator stack of an electric motor from rotating with reference to the surrounding frame. Shrink mounting is an inexpensive and reliable way to do this, but the drawback is inconvenience experienced when replacing the stack. If a frame made of aluminium is used in circumstances where high temperature differences have to be taken into account, it is nearly impossible with common aluminium grades to find a reliable dimensioning for the shrink mounting because the thermal expansion coefficient of aluminium is higher than that of the stator stack's sheet iron. If a shrink fit is selected which will remain tight even in the hottest condition, one incurs the risk that the frame cracks in cold weather owing to the high shrinkage stresses arising therein. Securing with a key entails extra costs because a keyway must be machined in the stator stack. There is moreover a risk that the chips enter the windings if this keyway has to be provided on the ready-wound stack. Locking with screws entails costs and introduces at least one point susceptible to leakage in motors operating under water. Clamping in axial direction entails costs, and it is unreliable owing to thermal expansions. The object of the present invention is therefore a means for preventing rotation with reference to the surrounding frame of an electromotor's cylindrical stator stack in which the plates have been bound together by an aluminium shell cast thereover. The object of the invention is to provide a more reliable means whichi is free of the drawbacks of design solutions of prior art. The invention is characterized in that the aluminium shell has an axial projection which enters an axial groove in the frame when the stator stack is pushed into place. The projection and groove constitute a locking preventing rotation of the stator stack. The means of the invention causes no piece costs at all. The reliable locking enables a less tight locking joint to be used, thus facilitating the stator stack replacement operation. In a simplified embodiment of the invention, the axial groove is located in an annular stop within the frame, against which the stator stack is axially pushed. The invention is described in the following with reference made to the attached drawing, wherein Fig. 1 presents an electric motor according to one embodiment, sectioned. Fig. 2 shows parts of the motor's frame and aluminium shell, seen from within. In the drawing, the reference numeral 1 indicates the motor frame, 2 the bottom and 3 the cover. The shaft 5 of the rotor 4 has been rotatably carried in the bottom and cover. As taught by the invention, the stator stack, comprising the plates 6 and the aluminium shell 7 cast thereupon, has been pushed into the frame 1. During this operation, of course, the cover 3 has been removed. The stator stack 6, 7 has been secured to be unrotatable with reference to the frame 1 owing to the circumstance that the aluminium shell 7 has an axial projection 8 which, as the stator stack is being pushed into place, enters an axial groove 9 in the frame. The axial groove 9 has been provided in an annular stop 10 within the frame 1, against which stop the stator stack is pushed in axial direction. The projection 8 is preferably produced by casting, simultaneously with the casting of the aluminium shell 7 over the plates 6. Similarly, the groove 9 is most appropriately produced in connection with the casting of the frame 1. It is naturally possible, in addition to the locking constituted by the projection 8 and groove 9, to apply furthermore a shrink mounting between the stator stack 6, 7 amd t frame 1. But this shrink fit may be comparatively loose, thus making replacement of the stator stack easier. It is obvious to a person skilled in the art that various embodiments of the invention may vary within the scope of the claims stated below. This concerns in particular the shape and size of the projection 8 and groove 9. Claims
1. In an electric motor, a means for preventing rotation with reference to the surrounding frame (1) of the cylindrical stator stack (6, 7) in which the plates (6) have been bound together by an aluminium shell (7) cast thereupon, characterized in that the aluminium shell (7) has an axial projection (8) which as the stator stack (6, 7) is being pushed in its place enters an axial groove (9) provided in the frame (1).
2. Means according to claim 1, characterized in that the axial groove (9) is located in an annular stop (10) within the frame (1), against which the stator stack (6, 7) is axially pushed.
3. An electric motor comprising a housing, a rotor disposed within the housing, and a stator surrounding the rotor and having a projection adapted to be received in an axial groove of the housing so as to prevent relative rotation between the stator and the housing.
4. An electric motor substantially as herein described with reference to the-accompanying drawings.
GB8236137A 1982-12-31 1982-12-20 Electric motors Expired GB2132419B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8222179A FR2538968A1 (en) 1982-12-31 1982-12-31 Device for preventing the rotation of the jacket of the cylindrical stator with respect to the surrounding shell, in an electric motor

Publications (2)

Publication Number Publication Date
GB2132419A true GB2132419A (en) 1984-07-04
GB2132419B GB2132419B (en) 1986-07-23

Family

ID=9280748

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8236137A Expired GB2132419B (en) 1982-12-31 1982-12-20 Electric motors

Country Status (5)

Country Link
DE (1) DE3246986A1 (en)
FR (1) FR2538968A1 (en)
GB (1) GB2132419B (en)
NL (1) NL8205040A (en)
SE (1) SE433418B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538968A1 (en) * 1982-12-31 1984-07-06 Sarlin Ab Oy E Device for preventing the rotation of the jacket of the cylindrical stator with respect to the surrounding shell, in an electric motor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10103806A1 (en) * 2001-01-29 2002-08-29 Siemens Ag Stator generator system, in particular drive arrangement for a hybrid vehicle
DE10226036A1 (en) * 2002-06-12 2003-12-24 Bosch Gmbh Robert Stator for electrical machine, has arrangement for setting correct angular position between stator and housing part with alignment element for attachment to stator
DE102008001098A1 (en) * 2008-04-09 2009-10-15 Robert Bosch Gmbh Stator attachment by means of dowel pins

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR950837A (en) * 1946-06-08 1949-10-07 Westinghouse Electric Corp Construction of a dynamo stator
DE821062C (en) * 1950-02-10 1951-11-15 Siemens Schuckertwerke A G Electric machine with adjustable stator core, for example an electric motor
DE1029081B (en) * 1956-03-16 1958-04-30 C O Oeberg & Co A B Device for fastening the stator of high-speed electrical machines to the outer housing
FR1434069A (en) * 1965-05-25 1966-04-01 Thomson Houston Comp Francaise Improvements to electrodynamic machines
JPS5629434A (en) * 1979-08-09 1981-03-24 Nippon Denso Co Ltd Stator fixing device of a.c. generator for automobile
US4318218A (en) * 1979-08-10 1982-03-09 General Electric Co. Method of making a dynamoelectric machine stator assembly
DE3246986A1 (en) * 1982-12-31 1984-06-20 Osakeyhtiö E. Sarlin AB, Helsinki Device for an electric motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538968A1 (en) * 1982-12-31 1984-07-06 Sarlin Ab Oy E Device for preventing the rotation of the jacket of the cylindrical stator with respect to the surrounding shell, in an electric motor

Also Published As

Publication number Publication date
DE3246986A1 (en) 1984-06-20
SE433418B (en) 1984-05-21
GB2132419B (en) 1986-07-23
SE8207310D0 (en) 1982-12-21
FR2538968A1 (en) 1984-07-06
NL8205040A (en) 1984-07-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee