JP5654262B2 - Electric motor - Google Patents

Description

  The present invention relates to an electric motor comprising one rotor (rotor) and one stator (stator), the stator being housed in a motor housing separated into two housing parts, each of the housing parts being In addition, bearing bridge portions are provided to cover the stator so as to face each other in the axial direction, and the ends of the respective housing parts that are related to each other are released from each other only by destruction.

  Electric motors, in particular in the form of commutator motors, and also in the form of reluctance motors are known techniques. For example, it is disclosed in Patent Document 1. The stator is housed in a motor housing separated into two parts, and each housing part is provided with a bearing bridge portion connected to a receiving portion that receives a bearing, for example, a ball bearing. The bearing supports the rotor shaft. In order to fix the housing parts on the stator, the ends of these housing parts are connected to each other, in particular by welding.

German Patent Application Publication 10337916A1

  There is a problem to be solved by the present invention regarding the above-described technique. That is, the known electric motors are particularly problematic with respect to fixing the housing parts to accommodate the stator.

These problems are solved by the configuration of the present invention. A bracket projecting in a direction perpendicular to the surface of the bearing bridge portion of the housing part (hereinafter referred to as “vertical direction”) is formed at each end of the housing parts that are related to each other. The brackets of the housing parts are configured so as to cover each other in a direction parallel to the surface of the bearing bridge portion of the housing parts (hereinafter referred to as “horizontal direction”). The connection fixing of the two housing parts to each other takes place in the area of the bracket. According to this structure, the simple form which fixes a housing component on a stator is obtained. In the configuration that forms a vertically projecting bracket, this part serves as a housing wall by connecting the housing parts around the stator, and the housing parts cover the stator in a bowl shape, This is advantageous over the known art in that the housing part is configured to face the stator in a fixed direction. The connection between the housing parts in a state in which the stator is accommodated is simplified, so that a manufacturing error can be compensated by a simple method. This applies in particular to the orientation of the housing part relative to the cross section intersecting the rotor axis.
As a result, the brackets at the end portions related to the respective housing parts are covered in the horizontal direction in the assembled state, but in the assembling process, the housing parts are determined in advance by the respective brackets protruding in the vertical direction. It will be installed in the position. The two housing parts in a state in which the stator is accommodated are fixed to each other at a portion of the bracket extending as a covering in the horizontal direction in both housing parts. Furthermore, it is preferably fixed by welding, so that the release of the connection of the housing parts occurs only by destruction. Preferably, the housing parts are fixed to each other by resistance welding. Further, in the shape of each housing part having a collar shape and a covering portion surrounding the periphery, the weight is reduced by forming each bracket projecting perpendicularly to the surface of the bearing bridge portion. Furthermore, the outer diameter of the housing part in the fixed region can be kept as small as possible.

  Further features of the present invention and features of the present invention dependent thereon will be described later with reference to the drawings. However, their characteristics are important independently.

  In still another preferred configuration of the present invention, the stator has a non-circular outer shape and includes a rounded curved region and a planar region. In the circumferential direction of the outer shape of the stator, one plane is at an angular position of 90 degrees with the adjacent plane. The corner between the two planes is a chamfered curved surface. Furthermore, the stator has at least a radius such that the rotor shaft can penetrate the stator.

  In a further preferred configuration, the bracket of the housing part is arranged corresponding to a plane outside the stator, and no housing part is arranged at the rounded corner of the stator. That is, at least the portions that are fixed to each other and become the outer wall of the stator are not formed at the corners of the stator. If necessary, such a rounded corner may be provided with an extra such coating, and the brackets provided on the bearing bridge portion for the purpose of suitable press fixing and holding on the stator of the housing part. You may connect with a connection part. In addition, the selected corresponding brackets on the stator outer plane provide positioning support means in the connection between the housing part and the stator. In that case, the rounded corners are also positioned correspondingly, and the housing parts that cover the stator are twisted, in particular, detents, by the final positioning of the housing parts.

  In a further preferred configuration, the housing part is formed as a metal plate bending part. Furthermore, it is formed in a bowl shape. In that case, a bearing bridge portion is formed at the bottom of the ridge, which is surrounded by a covering portion which is a side wall around the ridge, and further, a bracket extends vertically to its free end. It is preferable that the pair of brackets of both housing parts are linked to one stator outer plane by the pushing portion provided on one bracket. In particular, an insertion gap for the opposing bracket in the other housing part is formed between the extruded portion of one bracket and the stator outer plane. The opposing bracket in the other housing part is inserted between the bracket of one housing part and the stator outer plane. One bracket and the other opposing bracket overlap each other in the horizontal direction, both before assembly and after fixation. For this reason, in one of the housing parts, an extruded portion that is extruded radially outward is formed in a part of the bracket, whereby the connection region of the one bracket is shifted vertically outward. The opposite bracket of the other housing part, which is located on the surface of the other, does not have such a radially outward extrusion in its bracket connection region, but in a plane perpendicular to the bearing bridge It is extended.

  In a preferred configuration, these brackets have a trapezoidal shape, the trapezoidal shape being located at the free trapezoidal side parallel to the long trapezoidal side and the long trapezoidal side located in the connection region with the bearing bridge portion. With a short trapezoidal side. Further, in a preferred configuration, the trapezoidal shape of the bracket of one housing part is the same as the trapezoidal shape of the opposing bracket of the other housing part.

  In a preferred configuration, the extruded portion of one bracket extends entirely to the free end of the bracket, and the radial distance from the bracket free end to the corresponding stator outer plane is a predetermined radial direction of the bracket. It is provided so as to correspond to the plate thickness. Between the one bracket and the stator outer plane, the end of the opposite bracket of the other housing part is inserted.

In the invention of the electric motor according to the present invention, first, a solution to the problem of reducing the stator contact surface with respect to the housing part in the cross section, that is, limiting the area to a small area is obtained. At least three mounting parts separated from each other are formed on the covering part of the housing part. At least one mounting portion among them is formed so as to avoid displacement. According to this configuration, the housing component in which the bearing bridge portion is formed is mounted on the stator contact surface corresponding to the mounting portion partially, that is, with a limited area. Preferably, the mounting portion provides a limited linear attachment, and the mounting length in the circumferential direction is reduced to 1/10 to 1/50 of the entire peripheral length of the sectional area of the housing part. It can be.
The planar mounting (stopper) of the housing part on the corresponding stator contact surface is performed by a bearing bridge part and a bearing receiving part formed in the housing part. These correspond to the tilt of the bearing that supports the rotor shaft with a predetermined error. However, tilted bearings are not preferred for noise reduction and lifetime, especially with respect to those of the bearings. This problem is solved at least by the configuration of the placement unit. The configuration is such that the placing portion is formed so as to be able to avoid displacement. By making the mounting portion avoidable and displaceable, it is possible to obtain an accurate orientation of the housing component with respect to the stator, in particular, an accurate orientation of the bearing bridge portion that supports the bearing. By means of the avoidance displacement of the at least one mounting part, it is possible to obtain the correct orientation of the bearing bridge part, i.e. the correct orientation of the bearing receiving part relative to the cross section across the rotor axis. By forming at least one avoidable and displaceable mounting portion, the deviation of the stacked stator plates from parallel to the plane is compensated, and the inclination of the bearing receiving portion can be offset.

  Still another aspect of the present invention is the configuration described in another independent claim and its dependent claims.

  In still another configuration of the present invention, all the mounting portions are formed so as to be able to avoid displacement, and in addition, by the avoidance displacement of one or a plurality of mounting portions, in particular, the position and / or inclination of the shaft of the bearing bridge portion. Adjustment, and further adjustment of the position and / or inclination of the bearing receiver relative to the cross section across the rotor axis can be realized. By providing a plurality of mounting parts, these perform completely different avoidance displacements so that they are arranged in an advantageous arrangement for the desired positioning of the housing parts. As a result, the housing component is in a state where it strikes against the corresponding stator contact surface with an assembly strength of 1200 to 1700 Nm (Newton meter), preferably 1500 Nm, in a state where the stator is accommodated. This force is maintained for a long time in the orientation of the housing parts relative to the stator, so that the housing parts are fixedly connected and fixed to each other. That is, they are connected and fixed by welding the corresponding housing parts.

  In another configuration, at least three placement portions in the axial direction are formed so as to be unable to avoid displacement. These are formed for axial abutment against the corresponding stator abutment surface in one of the two housing parts. In this case, at least one further avoidable displacement mounting portion is formed for error compensation. Thereby, the inclination with respect to the cross section which crosses a rotor axis | shaft of the bearing receiving part which supports a bearing can be offset.

  In one embodiment, one housing part includes at least three placement parts that cannot be avoided and at least one placement part that can be avoided and the other housing part can be avoided and displaced. Only the placement portion preferably includes four placement portions that can be displaced by avoidance.

  In assembling the housing parts having the three parts that cannot be avoided and displaced on the stator, first, the parts that cannot be avoided and displaced are fixed to the corresponding stator abutment surfaces. Both housing parts exert an assembly strength of 1500 Nm on the stator abutment surface. At this time, one avoidable and displaceable mounting portion of one housing component contributes to the adjustment of the orientation of the cross section of the housing component with respect to the rotor shaft, and the other housing component has a predetermined displacement by the avoidable and displaceable mounting portion. By doing this, the orientation is parallel to the first housing part. Thereby, the height error of the stator packet is compensated. The one or more avoidable and displaceable mounting portions may not be displaced with respect to an unloaded reference position in positioning the housing component.

In a preferred configuration, avoidance displacement in the axial direction is obtained by the spring elasticity of the mounting portion. The mounting portion is displaced so as to avoid against a predetermined elastic force by a corresponding load in the assembled state. Thereby, the axial adjustment of the mounting portion with respect to the related stator contact surface is performed. Spring elasticity is obtained in a preferred configuration by tongues, which are displaced so as to be avoided by a corresponding radial force load. Further, for this purpose, these tongues are at the reference position when there is no load, and when they are inclined, they are displaced inward in the radial direction. The tongue, which is preferably formed from a housing part made of one piece of uniform material, simultaneously forms a mounting part. In a further preferred configuration, one housing part is formed from one metal material, preferably a steel plate, and the mounting portion is formed integrally with the housing part. Thereby, those placement parts are suitable in terms of strength and avoidance displacement.
From this point of view, it is preferable that the mounting portion is formed as a portion shifted in the horizontal direction with respect to the notch portion by stamping and bending the housing component. Due to the formation of the notch, the portion separated from the housing part is displaced radially inward with respect to the adjacent housing part region. In particular, the shape of the mounting portion that is supported upright with respect to the related stator contact surface is obtained by embossing a portion separated from the notch portion. These notches preferably extend in the horizontal direction, particularly in the circumferential direction of the housing part, and more preferably extend along a circle surrounding the rotor shaft, that is, in contact with the circle.
When the mounting portion that can be displaced in the axial direction is formed by the notch portion, the corner portion is preferably provided in the notch portion, and the notch portion is cut out and protruded in the horizontal direction, thereby lowering the notch portion. A vertical mounting portion connected to the end portion is formed. A tongue-like portion having a free end is formed by the notched portion having the corner portion, and can be freely displaced radially inward with respect to the surrounding housing component region.

  In a preferred configuration, the maximum distance of the horizontal displacement of the part separated from the notch or mounting part relative to the surrounding housing part area is several times the wall thickness of the housing part, in particular the wall The thickness is 1.5 to 5 times.

  The invention according to each claim may be a single configuration or a combination thereof.

  In a more preferable configuration, the position of the mounting portion corresponds to the position of the bracket protruding in the vertical direction, and more preferably corresponds to the position of the connection portion of the bracket on the housing part. Therefore, the mounting portion is formed by being separated from the notch portion at the base portion of the bracket. The secondary mounting portion engages with a contact surface located at an end portion of the stator outer plane.

  Each numerical range described above is illustrative and not limiting, and all intermediate values between them, in particular a sufficient step between the lower and / or upper boundary value and the other boundary value. Intermediate values of are also included. “And” with respect to a numerical value is used in this sense and includes any of both boundary values or a sufficient number of steps between both boundary values.

It is a development perspective view of an electric motor which is a form of a reluctance motor which comprises a stator, a rotor, and a motor housing which consists of two separated parts. It is a perspective view of the electric motor of the assembled state. It is the figure which looked at one housing component from the mounting side, ie, from the inside. FIG. 4 is an enlarged perspective view of an IV region in FIG. 3. FIG. 5 is a diagram corresponding to FIG. 4 and an enlarged perspective view of a V region in FIG. 3. It is the figure which looked at the other housing component from the inside. It is an expanded sectional view of the VII-VII line of FIG. It is an expanded sectional view of the VIII area of FIG. It is an expanded sectional view of the IX area | region of FIG.

The present invention will be described below with reference to the drawings showing examples.
With reference to FIG.1 and FIG.2, the electric motor 1 which is a form of a 4/2 type reluctance motor is demonstrated. In the two-phase motor, the rotor 3 is mounted on the rotor shaft 2 so as to rotate together. The rotor 3 includes two rotor poles 4 that are diametrically opposite to each other. The rotor 3 rotates around the rotor shaft 2 along the geometric rotor axis x during operation of the electric motor 1.

  The stator 5 that surrounds the rotor 3 on the radially inner side includes the stator poles 6 every 90 degrees at four locations in the circumferential direction of the rotor 3. These stator poles 6 have coils 7 wound around respective winding frames.

  The stator 5 is composed of a packet made up of a large number of stator plates 8 having the same shape. These stator plates 8 are manufactured by punching, and the stator 5 in which these are laminated together forms an outer wall having four planes 9 every 90 degrees on its outer wall, and includes a stator pole 6 directed radially inward. The corners 10 between the planes 9 in the circumferential direction of the stator 5 are chamfered so as to have a predetermined diameter with respect to the rotor axis x.

  The stator 5 is accommodated in a motor housing 11 that surrounds the outer surface thereof. The motor housing 11 is composed of two bowl-shaped housing parts 12 and 13. Each of these housing parts 12 and 13 is produced as a bent part of a steel plate and is first molded into a bowl shape. A bearing bridge portion 14 is formed in a portion constituting the bowl-shaped bottom portion, and a coaxial disc-shaped bearing receiving portion 15 is formed in a central annular region adjacent to the bearing bridge portion 14. A bearing 16 for the shaft 2 is supported. The bearing 16 is placed on the spring washer 29 of the receiving portion base 30 (see FIG. 7).

  A taper covering portion 17 is formed coaxially with the rotor shaft x and has an annularly closed flange-shaped side wall standing upright from the bearing bridge portion 14 and is expanded in a taper shape from the edge of the flange-shaped sidewall toward the radially outer side. Is formed, and an annular covering portion 18 extending in the vertical direction partially from the radially outer edge of the taper covering portion 17 is formed. The annular covering 18 is at least partially coaxial with the rotor axis x. The annular covering portion 18 extends at a predetermined position of the housing parts 12 and 13 with respect to the stator 5 and covers a predetermined end region of the corner portion 10 of the stator 5.

  In a predetermined position of the housing parts 12 and 13 with respect to the stator 5, the taper covering portion 17 is partially connected to the annular covering portion 18 in the circumferential direction, and from other portions to the plane 9 of the stator 5. A bracket 19 having parallel surfaces extends. In one embodiment, these brackets 19 are formed in a trapezoidal outline, and are spaced apart from a long lower trapezoidal lower side extending to the height position of the free edge of the annular covering portion 18 in a direction perpendicular to the upper side. And a shorter trapezoidal upper side extending in parallel. That is, the bracket 19 extends from the position of the free end edge of the annular covering portion 18 in the vertical direction, that is, in the direction of the rotor axis x. The vertical distance between two sides of the trapezoid extending in parallel is longer than one half of the stator packet thickness in the rotor axis x direction. In a state where the bracket 19 covers the plane 9 of the corresponding stator, the distance from the free end of the bracket 19 to the opposite end of the stator 5 corresponds to the vertical length of the annular cover 18.

  Corresponding to the four planes 9 of the stator 5, the housing parts 12, 13 are each formed with four brackets 19.

  As shown in FIGS. 1 and 7, the bracket 19 on the housing component 12 includes an extruding portion 20 that is extruded radially outward. The extent to which the extruded portion 20 is extruded in the radial direction is substantially the same as the thickness of the material plate of the housing part 12 with respect to the region surrounded by the bracket 19. Here, it corresponds also to the thickness of the material plate of the bracket 19. The thickness of the material plate is about 1 mm in this embodiment.

  Each extruded portion 20 includes a free end of the bracket 19 and has a shape in which two trapezoids are combined in the illustrated embodiment.

  As shown in FIG. 7, at a predetermined position with respect to the stator 5 in the housing part 12, the pushing portion 20 that is a part of the bracket has an inner surface facing the plane 9 of the stator 5 with a diameter with respect to the plane 9 of the stator 5. It extends so as to have a predetermined interval in the direction. A slit-like insertion gap 21 is formed between the flat surface 9 of the stator and the inner surface of the extruded portion 20. In the insertion gap 21, the free end of the opposing bracket 19 that is similarly provided at a predetermined position with respect to the stator in the opposing housing component 13 is inserted. This is due to the configuration of the brackets 19 of the housing part 13, in particular they are trapezoidal and extend perpendicular to the brackets of the housing part 12. However, the extrusion part 20 is not provided in the bracket 19 of the housing part 13. Instead, the vertical surface of each bracket 19 of the housing part 13 extends as it is, and each vertical surface is parallel to the surface extending including the rotor axis x.

  In the configuration of the brackets 19 of both the housing parts 12 and 13 described above, particularly in the assembled state, the bracket free end of the housing part 13 and the extruded portion 20 of the housing part 12 cover in the horizontal direction. 5 planes 9 are also covered.

  As shown in FIGS. 8 and 9, the contact surface 22 of the stator 5 is located in the region of the taper covering portion 17 in the cross section of the housing parts 12 and 13 in the assembled state. Correspondingly, mounting portions 24 and 23 shown in FIGS. 4 and 5 are formed on the bracket 19 side of the taper covering portion 17, respectively. Each of these is formed by cutting out the notch 25 from the material plate of the taper covering portion 17. That is, it is integrally formed with the material plates of the housing parts 12 and 13.

  Corresponding to the number of brackets 19 included in each housing part 12, 13 being four, in the example shown in FIGS. 3 and 6, the housing part 12 has three placement portions 23 and one piece. However, the present invention is not limited to such an arrangement, although only four mounting portions 24 are formed on the housing part 13.

  The placement parts 23 and 24 are parts formed by being cut out from the notch part 25 and pushed out radially inward. Thereby, the part which shifted | deviated to the radial direction inner side about the rotor axis | shaft x is formed in the horizontal direction. The end portions of the mounting portions 23 and 24 formed by the portions shifted radially inwardly support the housing components 12 and 13 on the corresponding contact surfaces 22 of the stator 5.

  The mounting portion 23 formed so as to be incapable of being displaced is provided with a notch portion 25 having a side extending in parallel to the trapezoid lower side of the corresponding bracket 19 in the horizontal direction, and the inclined wall of the taper covering portion 17 has a diameter. It has a shape that is extruded directly inward.

  The placement portion 24 that can be displaced in the horizontal direction, which is a portion protruding inward, similarly has the inclined wall of the taper covering portion 17 as a base end, but unlike the placement portion 23 that cannot be avoided and displaced, It is freely separated from the corner of the notch 25, thereby forming one tongue 26.

  As shown in FIG. 5, a portion of the exposed surface (radially inner surface) of the mounting portion 23 that cannot be avoided is extended substantially parallel to the bracket 19 in the vertical direction. On the other hand, as shown in FIG. 4, the tongue-like portion 26 of the placement portion 24 that can be displaced is extended from the proximal end portion on the taper covering portion 17 and is inclined radially inward at an angle of about 10 degrees. (See also FIG. 7).

  In the embodiment, the width of the mounting portion 23 and the tongue-like portion 26 in the circumferential direction of each of the housing parts 12 and 13 is approximately one third of the width of the stator plane 9 in the same direction.

  In assembling the electric motor 1, after inserting the rotor 3 into the stator 5 wound with a coil, the housing parts 12 and 13 are mounted on both ends of the rotor 3, respectively. This is done by pushing the rotor shaft 12 into the bearing bridge opening 27. Thereby, the taper covering portion 17 and the annular covering portion 18 of the housing parts 12 and 13 overlap with and cover the end portion of the stator 5. The stator 5 is press-fitted and held by the housing parts 12 and 13. Both brackets 19 of the housing parts 12, 13 overlap each other, and the bracket 19 of the lower housing part 13 is inserted into the insertion gap 21. The mounting portions 23 and 24 of the housing parts 12 and 13 are in contact with the contact surface 22 of the stator 5, respectively.

  Due to the effect of the housing parts 12 and 13 in the extending direction of the rotor shaft x, the housing parts 12 and 13 are assembled so that the assembly strength P is about 1500 Nm (Newton meter) (see FIG. 7). A bearing bridge opening 27 is formed so as to be exactly coaxial with the rotor axis x, and a bearing receiving portion 15 for holding the bearing is formed. By configuring the housing parts 12 and 13 in this way, the axial length of the bearing receiving portion 15 can be made to correspond to a predetermined size of the bearing 16 to be inserted. This compensates for any error in the packet length of the stator 5.

  The adjustment of the housing parts 12 and 13 so as to correspond to the stator 5 is realized by the support by the mounting portion 24 that can be displaced and displaced. In the state in which the mounting part 23 of the upper housing part 12 incapable of avoiding displacement fixes the housing part 12 and the two housing parts 12 and 13 face each other, The tongue 26 can be moved and / or inclined so as to release an error in each housing component by the spring elasticity applied to the tongue 26. Thereby, the tongue-like portion 26 is displaced more or less so as to deviate radially inward.

  The housing part 12 is positioned so as to be aligned with the corresponding stator contact surface 22 by the three mounting portions 23 formed so as to be incapable of displacement. The four placement portions 24 formed so as to be capable of avoiding displacement are adjusted and positioned on a predetermined plane by deformations that are possible for them.

  In the assembled state of the housing parts 12 and 13 thus configured, the brackets 19 that cover each other are welded. In that case, up to the intended yield strength, the bracket 19 of the housing part 12 is welded by resistance welding in the region of the welded portion 28 of the extruded portion 20.

  The subsequent stator 5 is fixed both in the axial direction and in the radial direction.

  With the above configuration, in a preferred example, compensation for the height error of the stator packet is realized. Thereby, the request | requirement with respect to component errors can be reduced. Furthermore, this alleviates the tilt of the bearing 16 of the roller shaft 2, which also works well with respect to noise and life.

  All features disclosed are per se related to the present invention. Each of the aspects of the present invention described above, in particular their respective features, may be combined with one or more other aspects of the present invention and their characteristics. The disclosure content of the related and attached priority documents (copies of previous patent applications) is also included in the disclosure of this application in order to include the features of these documents in the claims of this application. .

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Rotor shaft 3 Rotor 4 Rotor pole 5 Stator 6 Stator pole 7 Coil 8 Stator plate 9 Plane 10 Curved surface 11 Motor housing 12 Housing part 13 Housing part 14 Bearing bridge part 15 Bearing receiving part 16 Bearing 17 Taper covering part 18 Annular Cover part 19 Bracket 20 Extrusion part 21 Insertion gap 22 Contact surface 23 Placement part 24 Placement part 25 Notch part 26 Tongue part 27 Bearing bridge opening 28 Welding part 29 Spring washer 30 Receiving part base P Assembly strength (assembly force) )
x Rotor shaft

Claims (17)

A rotor (3) and a stator (5) are provided, and the stator (5) is accommodated in a motor housing (11) composed of two housing parts, and the two housing parts (12, 13) are respectively bearing bridge portions ( 14) is formed and covers each other in the axial direction so as to face the stator (5), and the mutually related ends of the two housing parts (12, 13) are connected to each other so that they can be detached only by breaking In the electric motor (1)
Each of the ends that are related to each other of the two housing parts (12, 13) are formed a plurality of brackets (19) projecting to the vertical direction of a plurality of portions in the circumferential direction, each of the brackets ( The electric motor is characterized in that the two housing parts (12, 13) are fixed to each other in the region of the bracket (19) by 19) covering each other in the horizontal direction in the assembled state.   2. The electricity according to claim 1, wherein the stator (5) has a non-round portion in its outer shape, and the rounded curved surface (10) and the flat surface (9) are alternately arranged. motor.   The electric motor according to claim 2, wherein the bracket (19) is arranged so as to overlap with a plane (9) outside the stator (5).   The housing part (12, 13) is manufactured as a metal plate bending part, and the extruded part (20) provided on one of the brackets (19) disposed so as to overlap the outer plane (9) of the stator (5) The electric motor according to claim 3, characterized in that an insertion gap (21) for the other bracket (19) arranged so as to overlap the same plane (9) is formed.   5. The electric motor according to claim 4, wherein the bracket (19) is trapezoidal.   The electric motor according to claim 4 or 5, wherein the pushing portion (20) of one of the brackets (19) includes the entire free end of the bracket.   At least one of the housing parts (12, 13) abuts the abutment surface (22) of the stator (5) in a limited cross-sectional area, and three or more separate mounting parts for abutment The electric motor according to any one of claims 1 to 6, wherein (23, 24) is formed, and at least one of the mounting portions (24) is formed so as to be able to avoid displacement.   The electric motor according to claim 7, wherein all the placement parts (24) are formed so as to be able to avoid displacement.   The electric motor according to claim 7, wherein at least three mounting portions (23) are formed so as not to be displaced in the axial direction.   One housing part (12) includes at least three placement parts (23) that cannot be avoided and at least one placement part (24) that can be avoided, and the other housing part (13). The electric motor according to claim 7, comprising only a mounting portion (24) capable of avoiding displacement.   The electric motor according to any one of claims 7 to 10, wherein the avoidable displacement in the axial direction is realized by the spring elasticity of the mounting portion (24).   12. The spring elasticity is obtained by a tongue-like portion (26) formed in the mounting portion (24), and the tongue-like portion is displaced and displaced by a radial load on the tongue-like portion (26). The electric motor described.   The housing part (12, 13) is made of a metal material including a steel plate, and the mounting part (23, 24) is formed integrally with the housing part (12, 13). Item 13. The electric motor according to any one of Items 7 to 12.   The notch part (25), wherein the placing part (23, 24) is formed by stamping and bending the housing parts (12, 13) and is displaced from the placing part in the horizontal direction. The electric motor according to claim 7, wherein the mounting portion is formed by the step.   15. The electric motor according to claim 14, wherein the notch (25) extends in the horizontal direction.   16. The electric motor according to claim 14, wherein the cutout portion (25) extends at an angle with respect to the placement portion (24) capable of avoiding displacement in the axial direction.   The electric motor according to any one of claims 14 to 16, wherein the horizontal displacement between the notch (25) and the mounting portion is several times the wall thickness of the motor housing.

Images