Stator assembly and method for fixing a lamination stack

Abstract

A stator assembly is disclosed, having a plurality of laminations, which are stacked to a lamination stack as a stator core, wherein on the stator core a coil accommodation is configured for accommodating a stator winding, and the stator core is arranged on a motor support having at least one bearing seat, wherein the bearing seat of the motor support is positioned centrically with respect to the stator core, wherein the stator core has a protrusion which is oriented radially with respect to the bearing seat, which protrudes into an axially configured recess of the motor support, wherein at least one protrusion of the stator core can be pressed against at least one recess of the motor support by at least one pressure of at least one punching tool on two opposite lateral sections of the protrusion. Furthermore, a method for fixing a lamination stack, in particular a stator core, on a motor support is disclosed.

Description

Technical Field

[0001] This invention relates to a stator assembly having a plurality of laminations stacked to form a lamination group as a stator core, wherein a coil receiving portion for accommodating stator windings is constructed on the stator core, and the stator core is arranged on a motor bracket having at least one bearing housing. Furthermore, this invention relates to a method for fixing the lamination group. Additionally, this invention relates to a motor having a stator assembly, particularly a brushless motor. Background Technology

[0002] Different types of electric motors are known. For example, an electric motor can be constructed as an internal rotor or an external rotor. In the external rotor type, the rotor radially surrounds the stator. Typically, this type of motor is designed as a brushless motor. Here, the stator has multiple stator windings. Here, the rotor can have permanent magnets, which can be electrically manipulated to load a magnetic field onto the stator windings to make the rotor rotate.

[0003] The stator windings are arranged regularly around the stator core to concentrate and enhance the generated magnetic field. Here, to reduce losses, laminations are stacked into the stator core. The laminations are then arranged on and pressed against the motor bracket. The motor bracket houses the ball bearings and the rotor shaft. By pressing the stator laminations together, the bearing housings introduced into the motor bracket can be deformed. Due to this deformation of the motor bracket, the dimensions of the bearing housings are no longer within the desired tolerances. Therefore, removing the inserted ball bearings may become difficult, or the bearing housings may need to be re-machined to accommodate the ball bearings. Summary of the Invention

[0004] The objective of this invention is to provide a stator assembly, a motor, and a method for pressing a lamination assembly of a stator core, wherein the stator assembly, motor, and method prevent deformation of the bearing housing of the motor bracket.

[0005] This objective is achieved by means of a stator assembly according to the invention. Advantageous designs of the invention include: the protrusions of the stator core, in a position where the stator core is positioned on the motor bracket and not compressed, having a radial distance relative to the motor bracket and a lateral distance relative to the sidewalls of the recesses of the motor bracket, wherein the radial distance is configured to be greater than the lateral distance; the protrusions of the stator core and the corresponding recesses of the motor bracket are uniformly arranged circumferentially along the motor bracket; the recesses of the motor bracket have compensating notches constructed in the region of the lateral sections and radially oriented relative to the bearing housing; the laminations of the stator core are designed as thin sheets and are made of steel, wherein the motor bracket is made of metal or plastic; at least one protrusion of the stator core can be loaded with at least one pressure from at least one stamping tool. The stator core is pressed against at least one recess of the motor bracket on two opposing lateral sections of the protrusion, wherein, when the stator core is pressed in the region of the lateral section of the protrusion, a stamping tool is placed at two points along the surface of the respective protrusion and pressed into the material of the stator core, wherein local material thickening is created on the lateral section of the protrusion, the material thickening pressing the lateral section against the material of the motor bracket; the stamping tool is centered or eccentrically pressed into the protrusion in the region of the lateral section; the lamination assembly is configured as the stator core; the motor is a brushless motor; at least one protrusion of the stator core can be pressed against at least one recess of the motor bracket on two opposing lateral sections of the protrusion by at least one pressure from at least one stamping tool.

[0006] According to one aspect of the present invention, a stator assembly is provided having a plurality of laminations stacked together to form a stator core. A coil receiving portion for accommodating stator windings is formed on the stator core.

[0007] The stator core is arranged on a motor bracket having at least one bearing housing. Preferably, the bearing housing of the motor bracket is centered relative to the stator core.

[0008] The stator core has a protrusion oriented radially relative to the bearing housing, the protrusion extending into a recess in the axial configuration of the motor bracket. At least one protrusion of the stator core can be pressed against at least one recess of the motor bracket by at least one pressure applied to two opposing side sections by at least one stamping tool.

[0009] The axially extending recess forms a guide groove for receiving and guiding the protrusion during assembly. Thus, the stator core laminations or sheets are positioned individually or as a group of laminations on the motor bracket.

[0010] The protrusion can be substantially rectangular, rounded, trapezoidal, or square, and extends radially, at least partially, into the recess.

[0011] Preferably, a radial gap can be maintained between the motor bracket and the protrusion to avoid mechanical action during compression onto the motor bracket.

[0012] The protrusion is pressed in such a way by one or more stamping tools that the lateral section of the protrusion presses against the side wall of the recess of the motor bracket.

[0013] Here, when the lateral section of the protrusion is deformed tangentially or circumferentially by a stamping tool and thus tilts laterally in the recess, mechanical stress directed radially toward the motor bracket and the bearing housing of the motor bracket can be avoided by clamping.

[0014] The inclination of the lateral section of the protrusion can be achieved with particular precision by partial pressing of the stamping tool and / or by sufficient radial spacing between the protrusion of the stator core and the bearing housing-facing wall of the motor bracket.

[0015] By axially inserting at least one stamping or clamping tool into at least one protrusion of the stator core, tangential deformation of the protrusion and wedging or tilting of the stator core in the lateral section of the protrusion can be achieved. For this purpose, the protrusion in the lateral section can contact or plastically deform together with the material of the motor support.

[0016] This tangential clamping between the protrusion and the sidewall of the recess of the motor bracket can avoid or prevent deformation of the support of the motor bracket, because the mechanical load oriented radially toward the motor bracket is minimized or prevented.

[0017] In one embodiment, the stator core protrusions, when positioned on the motor bracket and not pressed, have a radial distance relative to the motor bracket and a lateral distance relative to the sidewalls of the recess. Preferably, the radial distance is configured to be greater than the lateral distance. If the stator core is arranged on the motor bracket, the protrusions extend at least partially into the recess of the motor bracket. Here, in the radial cross-section, the distance between the protrusions, i.e., the radial distance, is provided towards the bearing seat of the motor bracket. This radial distance prevents the material of the protrusions from being squeezed and radially pressed against the material of the motor bracket during the action of the stamping tool. Therefore, the radial distance serves as a safety distance and can be constant over the entire width of the recess or vary along the width.

[0018] The width of the recess can preferably correspond to the width of the protrusion. A minimum lateral spacing can be provided between the sidewall of the recess and the lateral section of the protrusion.

[0019] The centering function of the protrusion on the motor bracket can be achieved within the width of the recess.

[0020] If the stamping tool is pressed into the material of the protrusion, the material in the lateral section of the protrusion first contacts the material of the motor bracket on the sidewall of the recess during extrusion. Here, the protrusion can be fixed tangentially or laterally in the recess.

[0021] The surface of the bearing housing facing the rotor shaft in the recess is preferably not in contact with the material of the stator core during clamping.

[0022] According to another embodiment, the protrusions of the stator core and the corresponding recesses of the motor bracket are evenly arranged along the circumference of the motor bracket. Preferably, the protrusions and the corresponding recesses of the motor bracket can be designed symmetrically, particularly rotationally symmetrically along the axis of rotation.

[0023] For example, the number of protrusions and recesses can be even, such that two protrusions and two recesses are arranged opposite each other.

[0024] The even distribution of protrusions in the stator core and recesses in the motor bracket ensures uniform weight distribution and optimal mechanical stability of the stator assembly.

[0025] According to another embodiment, the recess of the motor bracket has a compensation notch constructed in the region of the lateral section and pointing radially relative to the bearing housing. Here, at least one, preferably two, compensation notches may be provided in each recess.

[0026] When the stator core is pressed in the lateral section of the protrusion, a stamping tool is placed at two points along the surface of the corresponding protrusion and pressed into the material of the stator core. Here, a localized thickening of material is created on the lateral section of the protrusion, which presses the lateral section against the material of the motor bracket.

[0027] The compensation notch is used to minimize the pressure component toward the bearing housing. Here, the material of the stator core can expand into the compensation notch during clamping, thereby minimizing the radially inward load on the motor bracket relative to the rotor shaft.

[0028] According to another embodiment, a spacer element for orienting the stator core is constructed in at least one recess of the motor bracket. The spacer element, for example, divides the surface or wall of the recess facing the bearing housing into two sections with compensating notches. The spacer element enables the motor bracket to provide additional centering functionality, allowing for precise arrangement of the stator core.

[0029] According to another embodiment, the stator core laminations are designed as thin sheets and are made of steel. Preferably, the motor bracket is made of metal or plastic. In particular, the motor bracket can be manufactured by casting or injection molding. For this purpose, the material of the motor bracket can also be aluminum or an aluminum alloy.

[0030] According to another aspect of the invention, a method is provided for fixing a laminated assembly, particularly a stator core, onto a motor support.

[0031] In one step, a lamination group consisting of multiple pre-stamped laminations is centered on the motor bracket relative to the bearing housing of the motor bracket, wherein a protrusion of the lamination group radially configured along the direction of the bearing housing extends into a corresponding axially extending recess of the motor bracket.

[0032] The laminations are preferably pre-stamped and can be mounted on the motor bracket individually or as a lamination assembly. When mounting the lamination assembly, which can be designed as a stator core, the laminations are centered relative to the bearing housing of the motor bracket.

[0033] In another step, at least one stamping tool is placed on at least one protrusion of the stacked assembly. The stamping tool is then pressed into the material of the protrusion by pressure, such that the protrusion is pressed against the recess of the motor bracket in its lateral section. Preferably, the lateral section of the protrusion is connected to the sidewall of the recess by a pressure-friction locking and / or force locking.

[0034] This method allows for a permanent connection between the stator core and the motor bracket. Different materials can be used, but these materials should not be brazed or welded to each other. By pressing on the lateral section of at least one protrusion, the corresponding protrusion widens tangentially, thereby creating a connection between the protrusion and the recess. For example, pressing can be performed on two or more protrusions and corresponding recesses. Preferably, the connection with the sidewall of the recess is achieved in the circumferential direction.

[0035] This can prevent the application of radial forces toward the motor bracket, which would deform the motor bracket and prevent the rotor shaft and / or at least one bearing from being accommodated.

[0036] According to one embodiment, a stamping tool is pressed into a protrusion in a centered or eccentric manner in a lateral section. For example, the stamping tool may have a press-in mandrel that is pressed into the material of one or more protrusions of the stator core. Here, the press-in mandrel may be pressed in centered or eccentrically along the surface of the protrusion. For example, the press-in mandrel may be positioned in a region of a lateral section of the protrusion.

[0037] The stamping tool may have one or more press-in mandrels. Alternatively, multiple stamping tools, each with a press-in mandrel, or a single stamping tool with a press-in mandrel, may be placed multiple times to apply pressure to the surface of at least one protrusion of the stator core and achieve connection with the motor bracket. In particular, clamping can be achieved by introducing one or more press-in points into the surface of the protrusion. The press-in points may be pressed laterally into the surface of the protrusion, either laterally or in a region of a lateral segment of the protrusion, or centrally by at least one stamping tool.

[0038] Alternatively, a stamping tool with two or more press-in mandrels can be used to complete the pressing in one working process.

[0039] Furthermore, the present invention relates to an electric motor, particularly a brushless electric motor, preferably an electrically commutated electric motor. The motor includes a stator assembly according to the invention and a rotor rotatably configured relative to the stator assembly. The rotor is particularly configured as an external rotor.

[0040] The rotor has magnets, preferably permanent magnets. When the stator windings of the stator assembly are energized, a magnetic field is generated, which in turn causes the rotor to rotate.

[0041] The stator assembly of the motor has multiple laminations stacked together to form a stator core. A coil receiving portion for accommodating stator windings is constructed on the stator core. The stator core is arranged on a motor bracket having at least one bearing housing, wherein the stator core is centered relative to the bearing housing of the motor bracket. Advantageously, the stator core has a protrusion oriented radially relative to the bearing housing, the protrusion extending into an axially constructed recess in the motor bracket. Advantageously, at least one protrusion of the stator core can be pressed, preferably pressed, against at least one recess in the motor bracket by applying at least one pressure, particularly at least one pressure, from at least one stamping tool, onto particularly two opposing lateral sections of the protrusion.

[0042] According to an advantageous improvement, the stator assembly is part of the motor used to drive the pump or fan. Specifically, the motor is part of the pump or fan. Preferably, the stator assembly is part of the pump or fan, particularly the fan drive.

[0043] The improvement scheme for the stator assembly of the motor is derived from the implementation scheme for the stator assembly.

[0044] Preferred embodiments of the invention are described in more detail below with the aid of highly simplified schematic diagrams. Attached Figure Description

[0045] Figure 1 A schematic top view of a stator assembly according to one embodiment is shown, and Figure 2A schematic flowchart illustrating a method for fixing stacked wafers is shown. Detailed Implementation

[0046] Figure 1 A schematic top view of a stator assembly 1 according to one embodiment is shown. The stator assembly 1 is, for example, a component of an electric motor with an external rotor structure. For clarity, the rotor of the electric motor is not shown. The electric motor has a stator assembly 1.

[0047] The stator assembly 1 has a stator with a stator core 2. The stator core 2 is centrally arranged on the motor bracket 4. The stator core 2 is designed as a lamination group consisting of multiple laminations 6 stacked along the axial direction A.

[0048] Here, the stator core 2 surrounds the section of the motor bracket 4 on its periphery, and a bearing housing 8 for accommodating ball bearings is provided in this section. Here, the rotor shaft (not shown) is rotatably supported along the axial axis A or in the axial direction A.

[0049] Furthermore, a coil receiving portion 10 for accommodating the stator winding 12 is constructed above the stator core 2. The coil receiving portion 10 points radially away from the bearing housing 8 and is distributed circumferentially along the stator core 2. The coil receiving portion 10 is particularly formed with stator teeth. The coil receiving portion includes a stator tooth bar around which at least one stator winding is wound. A stator tooth head is constructed at the free end of the coil receiving portion 10, which in particular prevents the stator winding 12 from sliding in the radial direction. The stator winding 12 is wound around the coil receiving portion 10 here.

[0050] The stator core 2 has protrusions 14 pointing radially relative to the bearing housing 8. In the illustrated embodiment, six protrusions 14 are constructed, pointing in the direction of the axial axis A. The protrusions 14 have a substantially rectangular cross-section and extend at least partially into the recesses 16 of the motor bracket 4. The protrusions, in particular, have a constant circumferential spacing relative to each other. The number of protrusions 14 can be increased or particularly reduced to two, preferably three.

[0051] The recess 16 of the motor bracket 4 extends in the axial direction A and is used for the orientation of the stator core 2. Preferably, the recess 16 extends only in a portion of the stator core 2 in the axial direction. The extension of the recess 16 in the axial direction is in particular equal to or greater than, and in particular at least greater than, the extension of the protrusion 14 to which it belongs.

[0052] Preferably, one protrusion 14, and more preferably all protrusions, extend only on a portion of the extension of the stator core 2 in the axial direction.

[0053] A spacer element 18 for orienting the stator core 2 is constructed in the recess 16 of the motor bracket 4. The spacer element 18, for example, divides the surface or wall 20 of the recess 16 facing the bearing housing 8 into two sections with compensating recesses 22. The compensating recesses 22 are particularly semi-cylindrical in shape, having a semi-circular cross-section.

[0054] According to an improved design, the compensation notch 22 can have a triangular or rectangular cross-section.

[0055] The compensation notch 22 is constructed in the region of the lateral section 24 of the protrusion 14 and extends radially into the material of the motor bracket 4 relative to the bearing housing or bearing seat 8.

[0056] Preferably, the recess 16 and the spacer element 18 constructed therebetween form a UU-shaped cross-section.

[0057] If the stamping tool 26 presses into the material of the protrusion 14, the material on the lateral section 24 of the protrusion 14 first contacts the material of the motor bracket 4 on the side wall 28 of the recess 16. Here, the protrusion 14 can be fixed in the recess 16 either tangentially or laterally during pressing.

[0058] The material of the protrusion 14 first contacts the motor bracket 4 in the circumferential direction and in the opposite direction.

[0059] The stamping tool 26 may be positioned on at least one protrusion 14 at one or more press-in points 30. In the illustrated embodiment, a press-in point 30 is exemplarily shown, which is centrally arranged on the surface O of the protrusion 14 between two lateral sections 24 of the protrusion 14. By introducing the press-in point 30 through the stamping tool 26, the lateral sections 24 of the protrusion 14 can be connected to the sidewalls 28 of the recess 16. Through one or more such connections, the stator core 2 is connected to the motor bracket 4.

[0060] Preferably, the protrusion 14 of the stator core 2, in a state where the stator core 2 is positioned on the motor bracket 4 and not pressed, has a radial distance AR relative to the wall 20 of the motor bracket 4 or the recess 16 facing the bearing seat 8 and a lateral distance S relative to the side wall 28 of the recess 16. Preferably, the radial distance AR is configured to be greater than the lateral distance S.

[0061] The protrusion 14 preferably has a substantially rectangular cross-section. This cross-section is constructed perpendicular to the longitudinal axis A. A corresponding construction is exemplarily shown in... Figure 1 It is shown in four of the six protrusions 14.

[0062] In alternative or additional construction schemes, the protrusion has one or two semi-cylindrical shaped portions, which, in particular, engage with the compensation notches 22 in the assembled state. This achieves improved positioning in the circumferential direction. Preferably, in the construction scheme of the protrusion 14 with a semi-cylindrical structure, the spacing AR is greater than the lateral spacing S.

[0063] Compared to the lateral spacing S, the larger radial spacing causes the material of the protrusion to first come into contact with or establish a connection with the sidewall 28 during compression.

[0064] Figure 2 A schematic flowchart illustrating method 32 for fixing lamination group 2 is shown. Lamination group 2 is designed, for example, as a stator core and can be fixed to motor bracket 4. Here, motor bracket 4 is used as an example for method 32, which is not limited to the technical field of electric motors.

[0065] In step 34, the lamination group 2, consisting of multiple pre-stamped laminations 6, is centered on the motor bracket 4 relative to the bearing housing 8. Here, the protrusion 14 of the lamination group 2, which is radially constructed along the direction of the bearing housing 8, extends into the corresponding axially extending recess 16 of the motor bracket 4.

[0066] In another step 36, at least one stamping tool 26 is placed on at least one protrusion 14 of the stack 2.

[0067] Subsequently, in step 38, the stamping tool 26 is pressed into the material of the protrusion 14 by pressure, so that the protrusion 14 is pressed against and thus connected to the recess 16 of the motor bracket 4 in the lateral section 24. Here, by pressing the stamping tool 26 into the surface O of the protrusion 14, the material of the protrusion 14 or the stator core 2 is extruded from the pressing point or from the pressing portion to the lateral section 24 of the protrusion 14.

[0068] The material is compressed, especially causing the protrusion 14 to be along the edge. Figure 1 The direction of arrow P shown is widened. Preferably, the protrusion is widened both circumferentially and counter-circumferentially. This widening of the protrusion 14 creates an unremovable connection between the stator core 2 and the motor bracket 4 on the pressed protrusion 14. Preferably, the lateral section 24 of the protrusion is connected to the sidewall 28.

[0069] The compression and associated material compression cause the protrusion to expand toward the sidewall 28 of the recess 16. Advantageously, there is no or no significant expansion along the central axis or toward the spacer element 18. The absence of significant expansion is understood to mean that the expansion results in a connection sufficient to connect the stator support to the motor support against relative rotation. Advantageously, due to the compression, no force acts radially or against the radial direction from the stator core 2 onto the motor support 4. Only forces act tangentially, especially along / against the circumferential direction, between the stator core 2 and the motor support 4.

[0070] The stamping tool 26 can be pressed into the material of one or more protrusions 14 of the stator core 2. Here, the protrusions 14 can be plastically deformed at least locally at one or more locations by the pressure of the stamping tool 26.

[0071] The force applied by the stamping tool 26 is along the axial direction A. The resulting material deformation of the protrusion 14... Figure 1 This is illustrated by an arrow P oriented in the tangential direction T. The tangential deformation prevents the radial force oriented towards the motor bracket 4 from deforming and thus preventing the rotor shaft and / or at least one bearing from being accommodated.

[0072] The lateral section 24 of the protrusion 14 preferably points in the circumferential direction and against the circumferential direction. The surface of the lateral section points in the tangential direction T or against the tangential direction. The normal vector of the surface of the lateral section 24 extends in the circumferential direction or against the circumferential direction. Preferably, the lateral section 24 is a section of the protrusion that does not face the central axis, especially not the rotor shaft.

Claims

1. A stator assembly (1) having multiple laminations (6) stacked into a lamination group as a stator core (2), wherein, A coil receiving portion (10) for accommodating a stator winding (12) is constructed on the stator core (2), and the stator core (2) is arranged on a motor bracket (4) having at least one bearing seat (8), wherein the stator core (2) is centered relative to the bearing seat (8) of the motor bracket (4), characterized in that the stator core (2) has a protrusion (14) radially oriented relative to the bearing seat (8), the protrusion extending into an axially constructed recess (16) of the motor bracket (4), wherein at least one protrusion (14) of the stator core (2) is capable of being pressed against at least one recess (16) of the motor bracket (4) by at least one pressure applied to two opposing lateral sections (24) of the protrusion (14), wherein a spacer element (18) for orienting the stator core (2) is constructed in at least one recess (16) of the motor bracket (4).

2. The stator assembly (1) according to claim 1, wherein, The protrusion (14) of the stator core (2) has a radial distance relative to the motor bracket (4) and a lateral distance relative to the sidewall (28) of the recess (16) of the motor bracket (4) when the stator core (2) is positioned on the motor bracket (4) and not pressed, wherein the radial distance is configured to be greater than the lateral distance.

3. The stator assembly (1) according to claim 1 or 2, wherein, The protrusions (14) of the stator core (2) and the corresponding recesses (16) of the motor bracket (4) are evenly arranged along the circumference of the motor bracket (4).

4. The stator assembly (1) according to claim 1 or 2, wherein, The recess (16) of the motor bracket (4) has a compensating notch (22) constructed in the region of the lateral section (24) and pointing radially relative to the bearing seat (8).

5. The stator assembly (1) according to claim 1 or 2, wherein, The stator core (2) has laminations (6) designed as thin sheets and made of steel, wherein the motor bracket (4) is made of metal or plastic.

6. The stator assembly (1) according to claim 1 or 2, wherein, At least one protrusion (14) of the stator core (2) can be pressed against at least one recess (16) of the motor bracket (4) by at least one pressure applied by at least one stamping tool (26) on two opposing lateral sections (24) of the protrusion (14), wherein, when the stator core (2) is pressed in the region of the lateral section (24) of the protrusion (14), the stamping tool is placed at two points along the surface of the respective protrusion (14) and pressed into the material of the stator core (2), wherein a local material thickening is created on the lateral section (24) of the protrusion (14), the material thickening pressing the lateral section (24) against the material of the motor bracket (4).

7. A method (32) for fixing a stack of plates onto a motor bracket (4), wherein, - A stack of multiple pre-stamped laminations (6) is centered on the motor bracket (4) relative to the bearing seat (8), wherein a protrusion (14) of the stack of laminations radially (R) along the direction of the bearing seat (8) extends into a corresponding axially (A) extending recess (16) of the motor bracket (4). - Place at least one stamping tool (26) on at least one protrusion (14) of the stacked sheet assembly, - The stamping tool (26) is pressed into the material of the protrusion (14) by pressure, such that the protrusion (14) is pressed against the recess (16) of the motor bracket (4) in the lateral section (24), wherein at least one recess (16) of the motor bracket (4) is provided with a spacer element (18) for orienting the stator core (2).

8. The method according to claim 7, wherein, The stamping tool (26) is centered or eccentrically pressed into the protrusion (14) in the region of the lateral section (24).

9. The method according to claim 7, wherein, The laminations are configured as a stator core.

10. An electric motor having a rotor and a stator assembly (1), the stator assembly having a plurality of laminations (6), the laminations being stacked into a lamination group as a stator core (2), wherein, A coil receiving portion (10) for accommodating a stator winding (12) is constructed on the stator core (2), and the stator core (2) is arranged on a motor bracket (4) having at least one bearing seat (8), wherein the stator core (2) is centered relative to the bearing seat (8) of the motor bracket (4), characterized in that the stator core (2) has a protrusion (14) radially oriented relative to the bearing seat (8), the protrusion extending into an axially constructed recess (16) of the motor bracket (4), wherein at least one protrusion (14) of the stator core (2) is capable of being pressed against at least one recess (16) of the motor bracket (4) by at least one pressure applied to two opposing lateral sections (24) of the protrusion (14), wherein a spacer element (18) for orienting the stator core (2) is constructed in at least one recess (16) of the motor bracket (4).

11. The motor according to claim 10, wherein, This motor is a brushless motor.

12. The motor according to claim 10, wherein, The motor has a stator assembly (1) according to any one of claims 2 to 6.

13. The motor according to claim 10, wherein, At least one protrusion (14) of the stator core (2) can be pressed against at least one recess (16) of the motor bracket (4) by at least one pressure applied by at least one stamping tool (26) on two opposing lateral sections (24) of the protrusion (14).

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