TWI487249B - Electrical motor - Google Patents

Description

electric motor

The present invention relates first to an electric motor including a rotor and a stator, wherein the stator is housed in a motor housing composed of two components, the housing components of which simultaneously constitute bearing brackets, respectively, and are axially aligned with each other The manner covers the stator, wherein the corresponding edge regions of the housing parts are connected to one another only in such a way that their failure can be released.

Electric motors of the above type are known to us, in particular in the form of rectifying motors and reluctance motors. The stator is housed in a split housing, and the sections of the housing components also form a bracket to secure a bearing (eg, a ball bearing) for supporting the rotor shaft. In order to fix the housing parts to the stator, the corresponding edge regions of the housing parts are connected to each other mainly by welding.

In view of the above prior art, the technical problem of the present invention is to improve an electric motor of the above type particularly in how to fix each housing member to accommodate a stator.

This problem is first and basically achieved by the object of claim 1 of the patent scope, wherein the corresponding edges form tabs protruding in the vertical direction, and the tabs overlap each other in the horizontal direction in the mounted state. Preferably, in the region of the webs, the relative fixing of the housing parts is effected only in the area of the webs. This design provides an easy to install embodiment for securing the housing components to the stator. Conventional solutions use a wraparound housing wall to join the housing components and enclose the stator in a bowl-like manner. In contrast, the present invention employs a vertically protruding tab design in each housing component. It is especially advantageous in terms of orientation of the stator. As a result, the housing part can be joined in a simple manner after the housing part is accommodated, and the manufacturing tolerance can be compensated in a very simple manner. This applies in particular to the case where the housing part is oriented in a plane transverse to the rotor axis. Since the connecting pieces of the corresponding edges of the respective housing parts overlap each other in the horizontal direction when the mounting state is completed, the connecting pieces protruding in the vertical direction can be realized during the mounting process to realize the housing parts. Relatively pre-position. The housing parts are fixed to each other in the region where the connecting pieces of the two housing parts overlap in the horizontal direction in the case of accommodating the stator, preferably by welding the connecting pieces to achieve such fixing, in this case, The connection between the housing parts can be released by means of destruction. According to a preferred embodiment, the relative fixing of the housing parts is achieved by electric resistance welding. In addition, the vertical protruding connecting piece can achieve the purpose of reducing the weight compared to the design of the surrounding type bowl-shaped flange for the housing part, and at the same time, the housing parts can be kept as small as possible in the fixed area. The outer diameter.

Other features of the present invention will be described in the following, in which the description of the drawings, and the features of the scope of the patent application. However, such features may also only correspond to the individual features of claim 1 or other patent applications, or may be of an important significance as an independent feature.

According to a preferred embodiment of the invention, the stator has a non-circular outer contour, wherein the rounded area and the flattened area alternate. Referring to the stator profile, a flat zone is at an angle of 90° to an adjacent flat zone in the direction of rotation, wherein the corner regions of the flat sections are rounded and at least approximately one radius is used for the The circle is processed and its radius is related to the rotor axis running through the stator.

According to another preferred embodiment, the connecting pieces of the housing parts correspond to the flat areas of the stator such that the housings corresponding to the rounded corner regions of the stator are not or at least not fixed for each other. The outer side of the wall of the component forms a cover for the stator. This covering of the rounded area is only used to bond the housing parts of the connecting pieces on the bearing bracket as needed, and the housing parts are preferably tightly fixed to the stator. In addition, the connecting pieces are arranged to correspond to the flat area of the stator, which facilitates positioning when joining the housing parts and the stator, and in the case of a corresponding design in the rounded corner area, in particular in the finalization of the housing parts. The housing parts mounted on the stator are prevented from twisting before fixing.

According to a further preferred refinement, the housing part is embodied as a steel sheet bending element and has a substantially bowl shape, wherein the bowl bottom forming the bearing bracket surrounds the carrier bowl edge, and the webs protrude freely beyond the bowl edge in the vertical direction. Preferably, on the connecting piece, a press forming portion is provided on each of the connecting pieces of the housing member, and the press forming portion is formed under the action of the outer surface of the stator, specifically, the outer surface of the stator in the flat portion. An inlet for the insertion of the reverse tab of the other housing part. Correspondingly, the reverse connecting piece of the other housing part is inserted between the connecting piece of the housing part and the outer surface of the stator, so that the connecting piece and the reverse connecting piece are in a pre-installed state or in a fixed state. Down, they all overlap each other in the horizontal direction. For this purpose, at least part of the region of the web is radially outwards, so that the partial regions, in particular with respect to the web connection, extend in a radially outwardly offset vertical plane. According to the preferred embodiment, the reverse connecting piece is oriented in a vertical plane from the connecting piece connecting portion on the bearing bracket in such a manner that no such radial offset occurs.

According to a preferred embodiment, the tabs have a trapezoidal profile, including a trapezoidal lower base corresponding to the connecting portion on the bearing bracket, and a trapezoidal upper bottom extending parallel to the trapezoidal lower bottom and corresponding to the free end of the connecting piece, wherein According to a preferred embodiment, the trapezoidal profile is applied both to the connecting piece of the housing part and to the reverse connecting piece of the other housing part.

According to a preferred embodiment, the press-formed portion of the tab generally includes a free end of the tab such that the free end of the tab is spaced a radial distance from the corresponding outer surface of the stator via the selected radially projecting position so as to A reverse tab of the other housing component is inserted over the end between the end of the tab and the outer surface of the stator.

The present invention also relates to an electric motor according to the features of the preamble of claim 1, in order to solve the aforementioned problems, the present invention proposes a solution as follows: the housing member is mounted to the stator in a reduced cross-sectional area. On the corresponding end faces, wherein three or more mounting regions separated from each other are provided in the circumferential direction, at least one of which is designed to be offset. According to this design, the housing component parts constituting the bearing bracket are mounted on the corresponding end faces of the stator in the mounting areas, wherein the mounting areas are preferably provided with local linear positioning members, and the circumferentially mounted mounting lengths The cross-section of the housing member is reduced by one tenth to one-fiftieth of the entire circumference of the region. The planar impact of the housing parts on the corresponding end faces of the stator is transmitted to the bearing bracket formed by the housing parts and, in turn, to the bearing housing. If there is a certain tolerance, this phenomenon causes the bearing for supporting the rotor shaft to tilt. Bearing tilt can adversely affect noise formation and service life (especially the service life of the bearing). This problem can be solved by constructing at least one offsetable mounting area. With such an offset, the housing component (especially the bearing bracket for carrying the bearing) can achieve a correct orientation relative to the stator by implementing an offset of the at least one mounting zone to enable the bearing bracket or The bearing housing is precisely oriented in a plane transverse to the rotor axis. Furthermore, by providing at least one deflectable mounting area, the plane parallelism deviation of the stator pieces preferably used to form the stator can be compensated to avoid tilting of the bearing housing.

Other features of the present invention will be described in the following, in which the description of the drawings, and the features of the scope of the claims or other claims. However, such features may also only correspond to the individual features of claim 7 or other patent applications, or may be of an important significance as an independent feature.

According to a further development of the subject matter of the invention, all of the mounting areas are designed to be offset, wherein axial adjustment is possible by offset of one or more mounting areas, in particular the bearing bracket and the area for receiving the bearing And/or achieve orientation in a plane transverse to the axis of the rotor. If a plurality of mounting zones are provided, the mounting zones can be made to have completely different offsets in order to achieve the desired positioning of the housing components. In this process, it is further necessary to apply an assembly of 1200 to 1700 Newtons (preferably 1500 Newtons) which is pressed against the corresponding end faces of the stator on the housing parts to be aligned with each other while accommodating the stator. The force, wherein the assembly force is continuously applied to the housing members according to the orientation of the housing member relative to the stator until the housing members are non-movably connected and fastened to each other by the corresponding housing member segments being welded.

According to an alternative design, at least three mounting zones are designed to be non-axially offset. When the housing components are in contact with the corresponding end faces of the stator, the mounting regions provide axial pre-positioning for the housing components, and at least one other mounting region is offset to compensate for possible tolerances. Avoid tilting the bearing housing relative to a plane transverse to the rotor axis.

According to one embodiment, one housing part has at least three non-reversible mounting areas and at least one offset mounting area, and the other housing part is provided with only (preferably four) offsettable mounting Area. According to this design, first, the housing parts including the three non-shiftable mounting areas can be pre-fixed to the stator by abutting the non-removable mounting areas against the corresponding end faces of the stator, after which Applying a preferably 1500 Newton assembly force to the two housing members placed on the stator against the corresponding end faces of the stator, wherein one of the one housing members is non-removable mounting area for The housing part is oriented transverse to the rotor axis, the other housing part being oriented parallel to the first housing part through its deflectable mounting area, and at the same time heightening the stack of laminations that may occur on the stator The difference is compensated. The offsets of the mounting areas can each be different. When the housing component is in the fixed position, there may also be one or more offset mounting regions that are not displaced relative to the initial position that is unstressed.

According to a preferred embodiment, the axial offset is achieved by the elasticity of the mounting area. When the mounting area is correspondingly stressed during the installation process, a predetermined offset is overcome to cause a corresponding offset, so that the mounting area is axially adjusted relative to the corresponding end surface of the stator. According to a preferred embodiment, this resilience is produced by a reed which, in the event of a corresponding force, is deflected in the radial direction. According to a further refinement, the spring is oriented for this purpose in an unstressed initial position in such a way as to produce a preferably radially inwardly offset direction. Preferably, the reed is made of a material of the housing member in a manner that is integrally formed with the material of the housing and conforms to the material, and also constitutes a mounting area. According to a preferred embodiment, the housing part is made of a metal material, preferably a steel plate, and the mounting area is integrally formed with the housing part. This is preferably suitable for both the fixed mounting area and the offset mounting. Area. In this case, the mounting area on the housing part designed as a stamped and bent part is preferably formed by a plurality of horizontally offset sections formed by the separation grooves. The separation slot separates a section from the housing component, in particular by radially inwardly pressing the section exposed by the separation slot inwardly relative to the adjacent housing component region Offset to form a mounting area that is linearly abutted against the corresponding end face of the stator. The separation groove is preferably oriented horizontally and is further oriented in the direction of rotation of the housing member, particularly preferably along a circumference associated with the axis of the rotor or along a tangent to the circumference. In order to form the axially offset mounting region through the separating groove, it is preferred that the separating groove extends at an angle to further make a horizontal slit as a starting point as the fixed mounting region, and at the same time, the end separating groove is disposed in the vertical direction. . In a corresponding manner, a web is vacated by means of an angled separating groove which is offset radially inwardly relative to the region of the housing part around it.

According to a preferred embodiment, the maximum horizontal offset of the section vacated by the separating groove relative to the surrounding component part of the housing is several times the wall thickness of the motor housing, in particular, 1.5 of the wall thickness. Up to 5 times.

The features of items 1 and 7 of the aforementioned patent application scope are intrinsic to the essence of the invention for each feature combination, and the features of claim 1 and/or the scope of claim 7 can be The combination of features of another patent application or a plurality of features of the patent application scope may further be combined with a single feature of items 1 and 7 of one or more other patent applications.

Therefore, according to another preferred embodiment, the mounting areas correspond to the connecting pieces protruding in the vertical direction, and further preferably correspond to the connecting portions of the connecting pieces on the housing member, so that the mounting area is at the root of the connecting piece. Preferably, it is vacated through the separation tank. Correspondingly, the mounting areas are further preferably corresponding to the end faces of the flat regions forming the stator on the radially outer side.

Unless otherwise stated, the above numerical range of values also includes all intermediate values and is defined as follows: In particular, the 1/10 interval is adjusted from the lower limit and/or the upper limit to the other limit. By "and" is meant to move the two limits one or more tenths toward the other extreme direction, i.e., to narrow the range of values.

The invention will be described in detail below by means of the drawings showing embodiments.

The electric motor 1 in the form of a 4/2 reluctance motor is shown and described herein. A correspondingly designed two-phase motor has a rotor 3 that is fixed to the rotor shaft 2 in a torsionally resistant manner. This rotor has two rotor poles 4 arranged radially opposite one another. When the electric motor 1 is in operation, the rotor 3 rotates about a geometric rotor axis x defined by the rotor shaft 2.

The stator 5 surrounding the rotor 3 has, in the radial inner side thereof close to the rotor 3, four stator poles 6 which are at an angle of 90 to each other in the direction of rotation of the rotor 3. Windings 7 constituting the coils are mounted on the stator poles.

The stator 5 is constructed of a plurality of laminations of stator sheets 8 of the same design. The stator sheets are formed by a stamping method in an appropriate manner, so that after the assembly of the stator 5, four flat regions 9 are formed on the outer wall at an angle of 90° from the outline, and the flat regions are The stator poles 6 directed to the radially inner side correspond to each other. The (corner) region 10 connected to the flat regions 9 in the circumferential direction of the stator 5 is rounded, and the radius of the rounded circle is generally based on the rotor axis x.

The stator 5 is housed in a motor housing 11 that surrounds the stator from the outside, and the motor housing is composed of two bowl-shaped housing members 12 and 13. The housing parts are made of stamped and bent pieces of steel sheet and each have a bowl-shaped section which forms a bearing bracket 14 in the bottom region of the bowl, wherein the area of the bearing bracket 14 has a disc-shaped contour and the contour A circular central socket 15 is included, and the bearing 16 for the rotor shaft 2 is fixed in this socket. The bearing 16 is here supported by the socket bottom 30 via a spring coil 29.

An annular bowl wall oriented coaxially with the rotor axis x is connected to a radially outwardly extending conical cover section 17 at its distal end away from the bowl cover formed as a bearing bracket 14, and the radial extent of the covering section The end transitions into a cover flange 18 that is at least partially oriented coaxially with the rotor axis x. This cover flange extends at a corresponding position of the housing part 12 or 13 relative to the stator 5 and covers the corresponding edge area of the rounded stator area 10.

Viewed from the circumferential direction of the covering section 17, a connecting lug 19 is attached to the covering flange 18, which web extends parallel to the stator flat section 9 at a corresponding position of the housing parts 12, 13 with respect to the stator 5. The tab has a trapezoidal profile and includes a trapezoidal lower base extending parallel to the free outer edge of the cover flange 18, and a parallel to the trapezoidal lower base in a vertical direction (ie, along the direction of the rotor axis x) a trapezoidal upper base spaced a distance from the free outer edge of the cover flange 18. The vertical spacing of the two trapezoidal base edges distributed in parallel is greater than half the thickness of the stator lamination stack in the direction of the rotor axis x. In this case, when the web 19 covers the corresponding flattened area 9 on the rotor, the distance between the free outer edge of either web 19 and the opposite outer edge of the rotor 5 is substantially equal to the vertical extent of the cover flange 18. degree.

Four flat zones 9 are provided on the stator 5, and four connecting pieces 19 are provided on the casing member 12 or 13.

The webs 19 of the upper housing part 12 each have a radially outwardly extending press-form 20, wherein the press-form 20 is radially offset from the surrounding area of the web 19 and the housing The material thickness of the component 12 (particularly the tab 19) is substantially uniform, and in selected embodiments, the material thickness is about one millimeter.

Each press-formed portion 20 generally includes the free ends of the tabs and is designed as a double trapezoidal profile.

At a corresponding position of the housing part 12 relative to the stator 5, the tab segments comprising the press-formed portion 20 extend at a radial distance from the respective wide faces of the stator flat regions 9, thereby being on the stator surface A groove-shaped inlet 21 is formed between the inner surfaces of the press-formed portion 20, respectively. The other housing part 13 is also provided with a (reverse) connecting piece 19 at a corresponding position relative to the stator 5, the connecting pieces or their connecting piece ends being embedded in the inlet, wherein the connecting pieces 19 are designed, In particular, in terms of trapezoidal elongation and corresponding vertical extent, it corresponds to the web 19 of the housing part 12. However, the press molding portion 20 is not provided here. In fact, each of the webs 19 of the housing member 13 as a whole extends in a vertical plane which is parallel to a plane which is included in the direction of extension of the rotor axis x.

According to the foregoing design and arrangement, the connecting pieces 19 of the two housing parts 12 and 13 (in particular, the free end of the connecting piece of the housing part 13 and the press-formed part 20 of the housing part 12) are along the mounting position. The horizontal directions overlap and the flat region 9 of the stator 5 is further covered.

Furthermore, the housing parts 12, 13 are attached to the corresponding end faces 22 of the stator 5 in the region of the covering section 17 in the mounting position, in the mounting position. For this purpose, the bottom side of the cover section 17 is provided with mounting areas 23, 24 which are respectively situated in the region of the webs 19. The mounting zones are formed from the material of the covering section 17 via the separating groove 25, correspondingly formed integrally with the housing part 12 or 13, and the materials are identical.

Corresponding to the number of webs 19, each housing part 12, 13 has four mounting areas of this type, wherein the upper housing part 12 has three non-displaceable (ie fixed) mountings. Zone 23, and an offsetable mounting zone 24, the other housing component 13 has only a deflectable mounting zone 24.

The mounting areas 23 and 24 are formed by being cut by the separation groove 25 and pressed radially inwardly, thereby forming a plurality of sections which are horizontally offset with respect to the rotor axis x in the radial direction, wherein the transmission is made in such a manner The radially inner sections of the mounting areas 23 and 24 support the housing members 12, 13 on the corresponding end faces 22 of the stator 5.

The non-removable mounting area 23 has a horizontally extending, in particular, a separating groove 25 extending parallel to the trapezoidal bottom edge of the corresponding web 19, wherein the area is radially inwardly cut by the separating groove The segment snaps into the conical wall portion of the cover segment 17.

The horizontally offset portion of the deflectable mounting area 24 also covers the conical region of the segment 17, but, unlike the non-reversible mounting region 23, the segments are separated at an angle. The groove 25 is vacated to form the reed 26.

The exposed section of the non-removable mounting area 23 extends substantially parallel to the web 19 in a vertical direction, and the reed 26 of the deflectable mounting area 24 is formed from the root area on the covering section 17 to form a In the case of an angle of about 10°, it extends obliquely toward the inner side in the radial direction.

In the illustrated embodiment, the width of the exposed section or reed 26 of the mounting zone 23 along the circumference of the respective housing component 12, 13 is approximately equal to one third of the width of the stator flat zone 9 measured in the same direction. .

When the electric motor 1 is mounted, after the rotor 3 is inserted into the winding stator 5, a housing member 12, 13 is attached to each of the two ends of the rotor 3 by inserting the rotor shaft 2 through a central bearing bracket hole 27, wherein The housing parts 12, 13 enclose the edges of the stator 5 with their covering sections 17 and covering flanges 18, whereby the housing parts 12, 13 are tightly fixed to the stator 5. The webs 19 of the two housing parts 12, 13 are overlapped, wherein the webs 19 of the lower housing part 13 are embedded in the respective inlets 21. Thereafter, the housing parts 12, 13 are supported by respective mounting faces 23 and 24 on respective end faces 22 of the stator 5.

Approximately 1500 Newtons of assembly force P is applied to the housing members 12 and 13 along the direction of extension of the rotor axis x, under which the housing members 12 and 13 are oriented in an appropriate manner, in particular, This results in a precise coaxial orientation of the bearing support bore 27 and the socket 15 for the fixed bearing 16 with the rotor axis x. Furthermore, the housing members 12 and 13 are oriented in such a way that the axial spacing of the bearings 16 inserted into the socket 15 conforms to a specified size. Thereby, the possible tolerances in the height of the lamination stack of the stator 5 can be compensated for.

By supporting the housing parts 12, 13 with the deflectable mounting area 24, the respective housing parts can be adjusted accordingly with respect to the stator 5. The housing member 12 is first pre-fixed with the non-reversible mounting area 23 of the upper housing member 12, and subsequently, the offset mounting region 24, with the two housing members 12 and 13 oriented, In particular, the reed 26, the resilience achieved by the reed 26, causes the corresponding housing component to undergo displacement and/or tilt for overcoming tolerances, during which the reed 26 will more or less further toward the path. Offset to the inside.

The housing member 12 is accurately positioned through the three non-reversible mounting areas 23 first in the plane in which the corresponding stator end faces 22 are located. The fourth deflectable mounting area 24 can be matched to the prescribed plane by possible deformation.

In the position in which the housing parts 12 and 13 are mounted, the overlapping webs 19 are welded together, for which purpose the web 19 of the housing part 12 has soldering projections 28 in the region of its press-formed part 20 so that A targeted current transfer is achieved when performing resistance welding.

At this point, the stator 5 is pressed both in the axial direction and in the radial direction.

The advantage of the above design is that the height tolerance of the stator lamination stack can be compensated to further reduce the tolerance of the parts. In addition, it is also possible to avoid the inclination of the bearing 16 of the rotor shaft 2, which has a favorable influence on noise and service life.

All the revealed features (ie, themselves) are the essence of the invention. Therefore, the disclosure of the present application also contains all the contents disclosed in the relevant/attached priority documents (copy of the prior application), and the features described in the documents are also included in the scope of the patent application of the present application. The sub-items are characterized by alternative side-by-side terms, and the features of the prior art improvements of the present invention are described, the main purpose of which is to distinguish between the scope of the patent applications.

1. . . electric motor

2. . . Rotor shaft

3. . . Rotor

4. . . Rotor pole

5. . . stator

6. . . Stator pole

7. . . Winding

8. . . Stator piece

9. . . (stator) flat zone

10. . . (stator) (corner) area; (stator) rounded area

11. . . Motor housing

12. . . (top) housing parts

13. . . (bottom) housing parts

14. . . Bearing bracket

15. . . socket

16. . . Bearing

17. . . Coverage segment

18. . . Cover flange

19. . . (housing part) connecting piece

20. . . Press molding department

twenty one. . . (grooved) entrance

twenty two. . . (stator) end face

twenty three. . . (non-offset) installation area

twenty four. . . (offset) mounting area

25. . . Separation tank

26. . . Reed

27. . . Bearing bracket hole

28. . . Welding bump

29. . . Spring coil

30. . . Socket bottom

P. . . Assembly force

x. . . Rotor axis

1 is a perspective exploded perspective view of an electric motor in the form of a reluctance motor including a stator, a rotor, and a motor housing composed of two components.

2 is a perspective perspective assembled view of the electric motor.

Figure 3 is an internal detail view of the mounting area of the housing component.

Figure 4 is a perspective perspective view of a region IV of Figure 3.

Figure 5 is a perspective perspective view of the area V of Figure 3, in a manner consistent with Figure 4.

Figure 6 is an inside view of another housing component.

Figure 7 is a cross-sectional view taken along line VII-VII of Figure 2.

Figure 8 is an enlarged view of a region VIII of Figure 7.

Figure 9 is an enlarged view of a region IX in Figure 7.

1. . . electric motor

2. . . Rotor shaft

3. . . Rotor

4. . . Rotor pole

5. . . stator

6. . . Stator pole

7. . . Winding

8. . . Stator piece

9. . . Flat area

10. . . Area/stator area

11. . . Motor housing

12. . . Housing part

13. . . Housing part

14. . . Bearing bracket

15. . . socket

16. . . Bearing

17. . . Coverage segment

18. . . Cover flange

19. . . Connecting piece

20. . . Press molding department

twenty two. . . End face

twenty three. . . Installation area

twenty four. . . Installation area

25. . . Separation tank

26. . . Reed

27. . . Bearing bracket hole

28. . . Welding bump

30. . . Socket bottom

x. . . Rotor axis

Claims (17)

An electric motor (1) comprising a rotor (3) and a stator (5), wherein the stator (5) is housed in a motor housing (11) composed of two parts, and the housing parts (12, 13) At the same time, the bearing brackets (14) are respectively formed, and the stators (5) are covered in axial alignment with each other, wherein the corresponding edge regions of the housing parts (12, 13) are only capable of destroying them. The releasing manners are connected to each other, characterized in that the corresponding edges form a connecting piece (19) protruding in the vertical direction, and the connecting pieces (19) overlap each other in the horizontal direction in the mounted state, wherein the connecting pieces are in the horizontal direction The relative fixing of the housing parts (12, 13) is achieved in the area of (19). The electric motor of claim 1, wherein the stator (5) has a non-circular outer contour, and wherein the rounded area (10) and the flattened area (9) alternate. An electric motor according to claim 2, wherein the connecting pieces (19) correspond to flat areas (9) of the stator (5). An electric motor according to claim 1, wherein the casing member (12, 13) is designed as a steel plate bending member, and passes through a press forming portion (20) on the connecting piece (19) to cooperate with the outer surface of the stator. An inlet (21) for the reverse connection piece is formed. An electric motor according to claim 1, wherein the connecting piece (19) has a trapezoidal profile. The electric motor of claim 4, wherein the press-formed portion (20) of the connecting piece (19) generally comprises a free end of the connecting piece. An electric motor (1) comprising a rotor (3) and a stator (5), wherein the stator (5) is housed in a motor housing (11) composed of two parts, and the housing parts (12, 13) At the same time, the bearing brackets (14) are respectively formed, and the stators (5) are covered in axial alignment with each other, wherein the corresponding edge regions of the housing parts (12, 13) are only capable of destroying them. The disengagement means are connected to each other, characterized in that the housing parts (12, 13) are mounted on a corresponding end face (22) of the stator (5) in a reduced cross-sectional area, wherein three or more are separated from each other in the circumferential direction. The mounting area (23, 24), wherein at least one of the mounting areas (24) is designed to be offset. An electric motor as claimed in claim 7 wherein all of the mounting zones (24) are designed to be offset. An electric motor according to claim 7 wherein at least three mounting zones (23) are designed to be non-axially offset. An electric motor according to claim 7, wherein one housing part (12) has at least three non-removable mounting areas (23) and at least one offsetable mounting area (24), the other housing The component (13) is provided with only an offsetable mounting area (24). The electric motor of claim 7, wherein the axial offset is achieved by the elasticity of the mounting area (24). The electric motor of claim 11, wherein the elasticity is generated by the reed (26), and the reed is radially displaced when correspondingly stressed. An electric motor according to claim 7 wherein the housing member (12, 13) is made of a metal material, preferably a steel plate, the mounting area (23, 24) and the housing part (12, 13). One piece. The electric motor of claim 7, wherein the mounting portion (23, 24) on the casing member (12, 13) designed as a stamped and bent member is formed by a plurality of separation grooves (25). The horizontal offset section is formed. The electric motor of claim 14, wherein the separation groove (25) is oriented horizontally. An electric motor according to claim 14 wherein the separation groove (25) of the axially offsetable mounting zone (24) is oriented at an angle. An electric motor according to claim 14 wherein the maximum offset of the horizontal offset is several times the wall thickness of the motor housing (11).