GB2033261A - Securing a Stator with a Tight Fit into a Housing - Google Patents
Securing a Stator with a Tight Fit into a Housing Download PDFInfo
- Publication number
- GB2033261A GB2033261A GB7933422A GB7933422A GB2033261A GB 2033261 A GB2033261 A GB 2033261A GB 7933422 A GB7933422 A GB 7933422A GB 7933422 A GB7933422 A GB 7933422A GB 2033261 A GB2033261 A GB 2033261A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stator
- housing
- securing
- tight fit
- electric motor
- 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.)
- Withdrawn
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
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
- H02K15/028—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots for fastening to casing or support, respectively to shaft or hub
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Motor Or Generator Frames (AREA)
Abstract
A ram (34) has a conical front portion (3) and forms a mandrel to carry a stator (2) for assembly into a housing (1). A pressing member (4) is disposed behind the stator (2) to provide a follow-up displacement of the stator (2) when the ram (34) is pressed into the housing (1). The internal diameter (Di) of the housing (1) is selected to be in the range between the outer diameter (da) of the stator (2), reduced by the maximum permissible manufacturing tolerance together with the resilient elongation of the housing (1), and the maximum permissible elongation of the housing (1). <IMAGE>
Description
SPECIFICATION
A Method and Apparatus for Securing a Stator with a Tight Fit, in an Electric Motor or
Generator Housing
The present invention relates to a method and apparatus for securing a stator, with a tight fit, in
an electric motor or generator housing. This tight fit has to be retained in the housing to counteract the torque occurring at the armature.
It is known, to shrink fit the stator into a motor housing. For this purpose however, the motor housing has to be internally machined to an accurate tolerance and the housing and the stator heated to about 1 500C.
The object of the invention is to propose a simplified method for securing the stator with a tight fit in an electric motor or generator housing in which heat treatment is not necessary and internal machining of the housing can be dispensed with.
According to the present invention there is provided a method of securing a stator with a tight fit in an electric motor or generator housing, in which the stator is pressed into the housing behind a conical mandrel of identical diameter, the inside diameter of the housing is selected to be in the range between the outer diameter of the stator reduced by the maximum permissible manufacturing tolerance together with the resilient elongation range of the housing and the maximum permissible proportional elongation of the housing.
After pressing the conical mandrel through the housing the stator is retained with a tight fit at a predetermined position in the housing. It has been found that with the proposed selection of dimensions, the stator, having an identical external diameter as the conical mandrel, may be pressed into the housing with a relatively slight pressure. After pressing out the conical mandrel the stator is retained with a press fit by the resilience of the housing material. The maximum possible inside diameter of the housing with reference to the external diameter of the stator can lead to a press fit for the inserted stator when its expansion still lies within the resilient elongation range of the housing. On the other hand the inside diameter of the housing finds its limit at the proportional elongation of the housing by the conical mandrel being pressed therethrough.After exceeding the proportional elongation, which determines the uniform elongation in a transverse direction, splitting open of the housing is to be expected. In practice, however, this limit value will almost be of no significance, since the compressive forces during the pressing through of the conical mandrel will be quite high in this region. The internal diameter of the housing will expedientiy be somewhere close to the other limit value.
According to a preferred embodiment of the method the use of a housing made of an internally unmachined extrusion section is proposed, preferably a profile section of aluminium alloy.
Compared with the known shrinkage method the method in accordance with the invention presents the advantage that extrusion profile sections may be used for the housing which do not have to be internally machined. Aluminium presents the known thermo-technical advantages for electric motor and generator assembly.
Especially in housings made of an aluminium alloy the deformation of the mandrel made of highly tensile steel remains negligible.
Also according to the present invention there is provided apparatus for securing a stator with a tight fit in an electric motor or generator housing comprising a pressing ram having a conical portion centering the stator and a pressing member for the follow-up displacement of the stator.
Pressure is preferably applied directly to the mandrel for pressing the mandrel through, whilst via the pressure member the stator is only fed with limited force.
The present invention will be described further by way of example, with reference to the accompanying drawings, in which:
Figure 1 is an end view of a motor housing with a stator inserted therein;
Figure 2 is a longitudinal section through Figures; and
Figure 3 is a fundamental assembly arrangement of the motor housing and a stator mounted on a conical mandrel.
For insertion and securing of the stator 2, which generally is comprised of a laminated metal assembly and windings 21 protruding axially parallel and inserted in corresponding grooves, in the internally cylindrical motor housing 1, the stator is mounted on the pressing ram 34 on a mandrel 3 having a front conical portion 31. The external diameter da corresponds to the external diameter of the stator 2, i.e. it is within the manufacturing tolerance range of the stator 2.
From the side opposite the conical portion 31, a pressure member 4, having a bore 41, is slid onto the pressing ram 34 so that its pressing surface 42 abuts against the stator 2. In the surface 32 on the conical portion 3 and in the pressing surface 42 of the pressing member 4, grooves 33 or 34 are provided for receiving the protruding windings 21.
In accordance with the predetermined external diameter da of the stator 2 the inside diameterDi of the motor housing 1 is selected to be in the dimensional range between the external diameter da reduced by the maximum permissible manufacturing excess tolerance, in addition to the resilient elongation range of the housing, and the maximum admissible proportion elongation of the housing. Within this dimensional range, after pressing the conical portion 3 through the housing a press fit of the stator, having the external diameter da, in the motor housing, with the inside diameter Di, is attained.
During the insertion of the conical portion 3, the housing 1 supported against an abutment 5, the inlet edge region of the housing 1 is, in any case, enlarged to such an extent that also a stator 2, having a slight excess dimension relative to the outer diameter of the mandrel 3, may be inserted into the housing interior via the pressing member 4. The pressure for the mandrel 3 is preferably applied via the end face of the pressing ram 34.
Basically, however, sufficient pressure may be exerted on the mandrel 3 via the member 4 and the stator 2. It is possible to use a loose pressing ram which is adapted in length to the length of the housing. If the stator 2 has reached its end position in the housing 1, then the mandrel 3, via its pressing ram, is forced out on the other side of the housing 1. The pressing member 4, which has a smaller diameter than the stator 2, is removed from the entry side.
The method in accordance with the invention may be used fundamentally also in cast housings of steel or aluminium. When used in steel housings, however, the dimensional range is substantially reduced for the inside diameter of the housing so that closer manufacturing limits are necessary. To obtain a tight fit accordingly higher pressures must be applied to the conical mandrel.
A preferred field of application of the method in accordance with the invention therefore resides in the use of aluminium housings which are produced as sections of an extrusion profile. The standardised manufacturing tolerances of such extruded profiles thus lie within a region favourable for realising the invention. The pressures required can be produced and applied with relatively simple means.
Claims (6)
1. A method of securing a stator with a tight fit in an electric motor or generator housing, in which the stator is pressed into the housing behind a conical mandrel of identical diameter the inside diameter of the housing is selected to be in the range between the outer diameter of the stator reduced by the maximum permissible manufacturing tolerance together with the resilient elongation range of the housing and the maximum permissible proportional elongation of the housing.
2. A method according to claim 1, in which a housing formed of an internally unmachined extrusion profile section is used.
3. Apparatus for securing a stator with a tight fit in an electric motor or generator housing, comprising a pressing ram having a conical portion centering the stator and a pressing member for the follow-up displacement of the stator.
4. Apparatus according to claim 3, in which on supporting surfaces for the stator, both in the mandrel and and the pressing member, ring grooves are provided for receiving the windings projecting axially parallel from the stator.
5. A method of securing a stator with a tight fit in an electric motor or generator housing, substantially as herein described.
6. Apparatus for securing a stator with a tight fit in an electric motor or generator housing, substantially as herein described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782843607 DE2843607B1 (en) | 1978-10-06 | 1978-10-06 | Method for fastening the stator with an interference fit in an electric motor housing and device for carrying out the method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2033261A true GB2033261A (en) | 1980-05-21 |
Family
ID=6051553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7933422A Withdrawn GB2033261A (en) | 1978-10-06 | 1979-09-26 | Securing a Stator with a Tight Fit into a Housing |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE879233A (en) |
| DE (1) | DE2843607B1 (en) |
| FR (1) | FR2438366A1 (en) |
| GB (1) | GB2033261A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227539A (en) * | 2013-04-24 | 2013-07-31 | 大连德欣新技术工程有限公司 | Technology and device of pressing into wound core into traction motor seat of automobile |
| CN106602816A (en) * | 2016-12-13 | 2017-04-26 | 鹤山市源创电机有限公司 | Motor casing compaction device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006033179A1 (en) * | 2006-07-18 | 2008-01-24 | Robert Bosch Gmbh | Electrical machine i.e. three-phase alternator, for motor vehicle, has rotor arranged in housing, and stator fastened radially to housing shell through press-fit, where stator is brought into defined end position by using axial stop |
-
1978
- 1978-10-06 DE DE19782843607 patent/DE2843607B1/en not_active Withdrawn
-
1979
- 1979-09-26 GB GB7933422A patent/GB2033261A/en not_active Withdrawn
- 1979-09-27 FR FR7924028A patent/FR2438366A1/en not_active Withdrawn
- 1979-10-05 BE BE0/197499A patent/BE879233A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227539A (en) * | 2013-04-24 | 2013-07-31 | 大连德欣新技术工程有限公司 | Technology and device of pressing into wound core into traction motor seat of automobile |
| CN103227539B (en) * | 2013-04-24 | 2015-05-20 | 大连德欣新技术工程有限公司 | Technology and device of pressing into wound core into traction motor seat of automobile |
| CN106602816A (en) * | 2016-12-13 | 2017-04-26 | 鹤山市源创电机有限公司 | Motor casing compaction device |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2438366A1 (en) | 1980-04-30 |
| BE879233A (en) | 1980-02-01 |
| DE2843607B1 (en) | 1980-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |