ELECTRIC MOTOR, KITCHEN MACHINE AND ASSEMBLY PROCEDURES

Description

[0001] The present invention relates to an electric motor, in particular for a food processor, a food processor with an electric motor and a method for assembling an electric motor.

[0002] Electric motors, for example in the form of brushless DC motors, are known from the prior art and have a stator and a rotor that rotates relative to the stator. In brushless DC motors, the stator is equipped with stator coils and the rotor with permanent magnets.

[0003] The permanent magnets can be located on the outside of the rotor core (SPM - Surface Permanent Magnet) or embedded within the rotor core (IPM - Interior Permanent Magnet).

[0004] The permanent magnets are usually glued to the rotor core to secure them. However, this presents the problem that the permanent magnets must be held in position or pre-fixed until the adhesive has cured.

[0005] A solution known from the prior art is the provision of tabs on the rotor core. The rotor core is constructed from stacked electrical steel sheets, with sheet metal tabs formed on one or more of the electrical steel sheets to hold the respective permanent magnet in position.

[0006] However, this makes the sheet metal cutting of the rotor core more complex, as the tab geometry is not normally intended to be present in every sheet, thus requiring at least one additional sheet layer with the tabs. Since the sheet layers are stamped using a stamping die, and the number of different sheet geometries that such a die can produce is limited, the additional sheet layer may not even be able to be created in the die at all.

[0007] Another solution known from the prior art involves additional components that serve only to fix the permanent magnets. Solutions are possible in which the respective component completely fixes the permanent magnet – i.e., without the use of adhesive – or only allows for the preliminary fixing of the permanent magnet and is removed again after the adhesive has cured. However, the use of additional components makes the design and manufacture of the electric motor more complex and costly.

[0008] The use of several additional components is known, for example, from DE 10 2014 117 380 A1. This relates to a permanent magnet rotor for a brushless motor of the internal permanent magnet (IPM) type. A plurality of springs are provided to secure the permanent magnets in the rotor core. In their compressed state, these springs are arranged between the inner radial ends of the respective permanent magnet and an inner annular region of the rotor. Using these springs eliminates the need for adhesive to secure the permanent magnets.

[0009] EP 1 557 928 A1 relates to an electric machine with a rotor and a method for cooling this electric machine. The rotor has rotor segments with receiving slots formed between them for holding permanent magnets. Furthermore, the rotor has a rotor cover with clamping elements in triangular cross-section, which are inserted into the respective receiving slots and elastically deformed to securely fix the permanent magnets. The rotor also has a ventilation channel, and the rotor cover has an associated air guide element for generating an airflow through the ventilation channel when the rotor is rotating.

[0010] US Patent 2013 / 0221787 A1 relates to a rotor with a spring element for mechanically fixing magnets within the rotor. The spring element comprises a retaining ring with axially projecting fixing elements. The spring element is positioned within the rotor such that the fixing elements press and clamp a permanent magnet radially outward against rotor webs.

[0011] DE 10 2010 039 334 A1 relates to the fastening of magnets to a rotor. For this purpose, two axial fixing means are provided, each arranged at the axial ends of the rotor and designed as retaining discs to axially fix the permanent magnets. The axial fixing means also include fixing means to radially fix the permanent magnets.

[0012] DE 10 2012 206 475 A1 relates to a molded part for pre-fixing a permanent magnet in a rotor or stator, for fixing the permanent magnet using a curable medium, and for thermally protecting the permanent magnet during fixing. The rotor has a base body with a plurality of spoke-like recesses for the permanent magnets. The molded part is designed for pre-positioning the permanent magnets in the recesses and has an end plate and retaining strands projecting from it. In the area of ​​the end plate, the retaining strands are designed to seal the recess for a curing medium, thus forming a sealing area.

[0013] US Patent 2014 / 0103768 A1 concerns a rotor with radially embedded permanent magnets. The rotor includes projections that extend into recesses for the permanent magnets to secure the permanent magnet within the recess.

[0014] DE 10 2020 120 233 A1 relates to a motor component for an electric motor, wherein the motor component comprises a stack of sheet metal with recesses for further components, for example, magnets. The sheet metals have projections that extend into the recesses and are bent over or spring-deformed when the further components are inserted in order to hold the components securely in the recesses. The components are further bonded in the recesses.

[0015] WO 2017 / 076461 A1 concerns a magnet holder for use in an electric motor with a rotor having a plurality of slots for receiving permanent magnets. The magnet holder has an annular base and several outer legs, each of which can be inserted into the slots and engage in recesses of the respective permanent magnets to form a positive connection.

[0016] US 2020 / 0251942 A1 relates to a rotor with a shaft and a rotor body, wherein the rotor body comprises a plurality of permanent magnets, a rotor core, an injection-molded part for carrying the permanent magnets, and a cover that can be snapped onto the injection-molded part.

[0017] The present invention is based on the objective of providing an electric motor, a kitchen machine with an electric motor and an assembly method for an electric motor, wherein the electric motor has a simple, compact and / or cost-effective design or enables simple, quick and / or cost-effective assembly / manufacturing and / or wherein a safe and reliable positioning or (pre-)fixing of the permanent magnets on the rotor or rotor core is ensured.

[0018] The problem underlying the invention is solved by an electric motor according to claim 1, a kitchen appliance according to claim 12, or a method according to claim 13. Advantageous embodiments are the subject of the dependent claims.

[0019] The proposed electric motor has a (stationary) stator and a rotor that can rotate around a rotational axis relative to the stator.

[0020] The rotor has a rotor body / rotor core, which is formed in particular by stacked rotor laminations or electrical steel sheets. The rotor core is therefore preferably a laminated core or rotor core.

[0021] The rotor features a multitude of permanent magnets, which are provided or embedded in the rotor core. For this purpose, the rotor core has corresponding magnet receptacles, or corresponding magnet receptacles are formed within the rotor core, with each magnet receptacle being radially limited to the outside by a (radial) stop.

[0022] The spatial arrangements, configurations and / or orientations, in particular the terms "radial", "axial" and / or "circumferential" used within the scope of the present invention, refer - unless otherwise specified - in particular to the axis of rotation of the rotor or a rotor shaft of the rotor.

[0023] As proposed, the rotor has a mounting device for mounting the permanent magnets.

[0024] The mounting device has a base body and (at least partially) compliant / flexible / elastic fixing elements that serve to (pre-)fix the permanent magnets. The fixing elements project axially from the base body into the magnet receptacles or engage axially in the magnet receptacles and press or clamp the permanent magnets radially against the respective (radially outward) stops.

[0025] Preferably, each magnet holder or permanent magnet is assigned (exactly) one fixing element.

[0026] Advantageously, the permanent magnets are pushed or pressed into the desired position or final position by the fixing elements and / or held or fixed in position there. The fixing elements thus ensure secure and reliable positioning or (pre-)fixing of the permanent magnets, as well as simple and quick assembly or manufacturing.

[0027] The fixing elements are preferably formed integrally with the base body. This means that only one component is needed to position and fix all the permanent magnets. This contributes to a simple, compact, and cost-effective design of the electric motor or rotor and also simplifies assembly and manufacturing.

[0028] The permanent magnets are (additionally) bonded to the rotor core and / or the mounting device. The fixing elements serve primarily to position or pre-fix the permanent magnets while the adhesive cures. This results in a particularly stable and secure fixation of the permanent magnets. Furthermore, it eliminates the need for additional devices, required in the prior art, to hold the permanent magnets in position during the adhesive curing process.

[0029] The fixing elements are preferably elongated, arm-like, or rib-like.

[0030] Preferably, the fixing elements each have a first axial end or connecting arm, wherein the first axial end or connecting arm of the fixing element (flexible) is connected to the base body of the mounting device. Preferably, the fixing elements each have a second axial or free end or head, wherein the free end or head presses against or rests against the permanent magnet. This creates a particularly simple and flexible fixing element.

[0031] Preferably, the respective fixing element projects into the magnet receptacle at least substantially to half its axial extent and / or presses the respective fixing element – ​​particularly with its head – at least substantially centrally onto one side of the permanent magnet, especially the radially inward-facing (end) side. This results in a particularly uniform force being applied to the permanent magnet.

[0032] The radial stops are preferably formed by the rotor core, in particular by one or more rotor laminations of the rotor core. This promotes a simple and compact design.

[0033] The stops can be designed as webs, especially if they are formed by only individual rotor laminations.

[0034] Preferably, the stops or webs are bent / curved radially inwards or into the respective magnet receptacle. This ensures that the rotor diameter does not change even if the stop / web bends. Such bending can occur due to the force exerted by the permanent magnet when it is pressed against the stop. Therefore, the stops are preferably designed to counteract or compensate for radial forces.

[0035] The stops preferably each have lugs that project radially into the magnet receptacles or point in the direction of the axis of rotation. The lugs form a contact surface, preferably essentially point-like, for the respective permanent magnet.

[0036] The mounting device axially limits the magnet receptacles and has one or more reservoirs or receiving chambers that serve to receive (overdosed or excess) adhesive.

[0037] Advantageously, any excess adhesive applied due to tolerances is collected in the receiving chamber(s), eliminating the need for removal and preventing contamination of the production equipment. This facilitates simple and cost-effective assembly and manufacturing. Furthermore, a stable and secure fixation of the permanent magnets is ensured, as the adhesive can be (slightly) overdosed without difficulty, guaranteeing a strong bond. Finally, this design results in a particularly simple and compact construction.

[0038] A common receiving chamber can be provided for several or all magnetic mounts or permanent magnets. Alternatively, and preferably, each magnetic mount or permanent magnet is assigned one (own) or several (own) receiving chambers.

[0039] The mounting device axially limits the magnet receptacles, particularly on the bottom side or from below, and forms an axial stop or counter bearing for the permanent magnets. For this purpose, the mounting device preferably has one or more, preferably rib-like, contact or stop elements.

[0040] In particular, the permanent magnets can be inserted or pushed in from above or from the axial side of the magnet holder opposite the mounting device until they strike or come to rest against the mounting device, especially the stop element(s). This facilitates simple and safe assembly as well as a simple design of the electric motor or rotor.

[0041] Unless otherwise specified, the terms "top," "bottom," and the like refer specifically to the preferred orientation of the electric motor or rotor during the mounting of the permanent magnets, where the mounting device is arranged axially below the rotor core. However, the mounting and / or installation of the electric motor in a food processor or other device can also be carried out in a different orientation.

[0042] Preferably, the receiving chamber(s) are laterally delimited by the stop element(s). This allows the receiving chamber(s) to be easily implemented or formed in the area of ​​the magnet receptacle and / or directly below the permanent magnet. This ensures that the excess adhesive remains in the receiving chamber.

[0043] The assembly device is preferably injection-molded and / or manufactured in one piece, particularly with regard to the fixing elements and / or receiving chambers. This facilitates particularly simple and cost-effective manufacturing with few components.

[0044] Preferably, the rotor core and / or the mounting device are connected to a rotor shaft by means of a force-fit, form-fit, and / or material-fit connection, for example, by means of notches or an interference fit. The mounting device is preferably also (directly) connected to the rotor core and / or the permanent magnets by means of bonding.

[0045] Additionally or alternatively, the mounting device may have fastening elements that attach the mounting device (directly) to the rotor core - in particular before or in addition to the bonding.

[0046] The fastening elements are preferably pin-shaped and / or project axially into or through the rotor core. Particularly preferably, the fastening elements are hot-stitched to the rotor core and / or form a snap-fit ​​connection with the rotor core.

[0047] The fastening elements enable a particularly stable and compact design of the rotor.

[0048] The fastening elements on the mounting device or the connection of the mounting device and the rotor core by means of the fastening elements can also be realized independently of the fixing of the permanent magnets and / or the formation of adhesive receiving chambers.

[0049] Preferably, the rotor has a blower or fan for cooling the electric motor, wherein the blower or fan forms or comprises the mounting device.

[0050] The fan therefore enables, in addition to ventilation, additional functions such as the suggested positioning or fixing of the permanent magnets and / or the provision of receiving chambers for adhesive.

[0051] Advantageously, the means for mounting the permanent magnets, particularly for positioning and fixing them, especially the fixing elements and / or receiving chambers, are thus formed on or integrated into a component already used for other purposes. This eliminates the need for additional mounting components entirely. This contributes to a simple, compact, and cost-effective design of the electric motor or rotor and also simplifies assembly and manufacturing.

[0052] Another aspect of the present invention, which can also be implemented independently, relates to a kitchen machine with a proposed electric motor.

[0053] The proposed food processor is driven by an electric motor, particularly for chopping and / or stirring or mixing food. Preferably, the food processor includes a stirrer, a cutter, or the like, which can be set in rotation by the electric motor.

[0054] Using the proposed electric motor in a food processor offers several advantages. In particular, its compact, flat, and simple design allows for a particularly space-saving installation within the food processor. However, the electric motor can also be used in other devices, such as vacuum cleaners or robotic vacuums.

[0055] Another aspect of the present invention, which can also be implemented independently, relates to a method for assembling an electric motor or a rotor for an electric motor, in which a permanent magnet is inserted or pushed into a magnet receptacle provided in the rotor core and thus bonded in place. According to the proposal, a mounting device for the rotor is used during the bonding process.

[0056] In the proposed method, the mounting device has a flexible fixing element that projects axially into the magnet holder. When the permanent magnet is inserted into the magnet holder, the fixing element presses or clamps the permanent magnet radially against a stop that radially limits the magnet holder. This positions the permanent magnet and / or fixes it in place during the curing of the adhesive.

[0057] In addition to the fixing element, the assembly device in the proposed method has a receiving chamber, wherein (overdosed) adhesive is received in the receiving chamber during the assembly of the permanent magnet or is introduced into the receiving chamber by the permanent magnet.

[0058] The proposed method offers certain advantages. In particular, the previously described electric motor and / or its rotor can be assembled or manufactured using the proposed method.

[0059] Further aspects, advantages, features, properties, and advantageous embodiments of the present invention will become apparent from the claims and the following description of preferred embodiments with reference to the figures. These figures are shown schematically and not to scale. Fig. 1 a perspective view of a proposed electric motor with a stator and a proposed rotor; Fig. 2 an exploded view of the stator according to Fig. 1 ; Fig. 3 a perspective view of the rotor according to Fig. 1 ; Fig. 4 an exploded view of the rotor according to Fig. 3 ; Fig. 5 a top view of the rotor according to Fig. 3 with an enlarged section in the area of ​​a stop; Fig. 6 a section of the rotor according to Fig. 3 along its axis of rotation in the area of ​​a permanent magnet of the rotor; Fig. 7 Fig. 6 corresponding section of the rotor when a permanent magnet is inserted during assembly; Fig. 8 Fig. 6 corresponding section of the proposed rotor according to a second embodiment; Fig. 9 a section of the proposed rotor according to a third embodiment along its axis of rotation in the area of ​​a section of the rotor core; and Fig. 10 a side view of a proposed kitchen machine.

[0060] In the figures, which are partly not to scale and only schematic, the same reference symbols are used for identical, similar or comparable parts and components, whereby corresponding or comparable properties or advantages are achieved, even if repetition is omitted.

[0061] For better clarity, not all identical parts and components within a figure are marked with a reference symbol.

[0062] Fig. 1 Figure 1 shows a proposed electric motor 1 in a schematic, perspective view.

[0063] In the illustrated embodiment, the electric motor 1 is designed as a brushless DC motor. However, other solutions are also possible in principle.

[0064] The electric motor 1 has a (stationary) stator 10 and a (rotating) rotor 20, wherein the rotor 20 is rotatable about a rotation axis A relative to the stator 10.

[0065] Optionally, the electric motor 1 can have a housing, or the stator 10 and / or rotor 20 can be arranged in a housing (not shown).

[0066] In the illustrated example, the electric motor 1 is designed as an internal rotor motor, or the rotor 20 is at least partially arranged inside the stator 10.

[0067] Fig. 2 shows the stator / stand 10 of the electric motor 1 in a schematic exploded view.

[0068] The stator 10 has several, here twelve, windings / coils 11, a stator core 12, a coil carrier 13 and / or a connection device 14.

[0069] The stator core 12 preferably comprises several stacked electrical steel sheets or stator laminations 12A, which form several, here twelve, coil sections 12B, wherein each winding / coil 11 is wound around a coil section 12B and / or each coil section 12B extends through a coil 11.

[0070] Optionally, the coil carrier 13, which supports the coils 11, can be provided, as in Fig. 1 shown. However, it is also possible to wind the coils 11 directly around the coil sections 12B.

[0071] The coil carrier 13 can be formed in one piece, for example by injection molding onto the stator core 12. Alternatively, the coil carrier 13 can be formed in multiple parts. For example, the coil carrier 13 can consist of two nesting parts into which the stator core 12 is / will be enclosed.

[0072] The coils 11 can be supplied with current via the connection device 14. Preferably, the connection device 14 has one or more electrical connections 14A and / or a connection carrier 14B, which is preferably formed integrally with the coil carrier 13 or a part thereof.

[0073] Fig. 3 shows the proposed rotor / runner 20 in a schematic, perspective view, which leads to Fig. 1 corresponds. Fig. 4 shows the rotor 20 in a schematic exploded view. Fig. 5 shows the rotor 20 in a schematic top view.

[0074] The rotor 20 has several, here ten, permanent magnets 30, a rotor core 40, a mounting device 50 and / or a shaft 60.

[0075] The permanent magnets 30 are preferably at least substantially cuboid in shape. Their edges may be rounded and / or they may have chamfers 31, which will be discussed further later in connection with Fig. 7 will be discussed in more detail.

[0076] Preferably the permanent magnets 30 are flat or each has two opposite flat sides 32.

[0077] Preferably the permanent magnets 30 are polarized in the direction of their thickness or in the direction orthogonal to the flat sides 32 and / or the two flat sides 32 of a permanent magnet 30 form different poles.

[0078] The permanent magnets 30 are arranged or embedded in the rotor core 40. The rotor core 40 has corresponding magnet receptacles 41 for this purpose.

[0079] The permanent magnets 30 are preferably arranged in the rotor 20 or rotor core 40 such that they are polarized in the circumferential direction - with respect to the shaft 60 or axis of rotation A - and / or that the surface normals of their flat sides 32 point in the circumferential direction.

[0080] The permanent magnets 30 or magnet mounts 41 are preferably arranged in a star shape in the rotor 20 or rotor core 40 and / or around the shaft 60 or axis of rotation A and / or extend or have a main / longitudinal extent - with respect to the shaft 60 or axis of rotation A - in a radial direction.

[0081] The permanent magnets 30 are preferably arranged such that the opposing poles or flat sides 32 of two adjacent permanent magnets 30 have the same polarity, so that the part or sector section 42 of the rotor core 40 arranged between the poles or flat sides 32 is polarized accordingly or forms a corresponding pole of the rotor core 40. In other words, two adjacent permanent magnets 30 are preferably polarized in opposite directions.

[0082] In principle, the permanent magnets 30 can also be shaped, polarized, and / or arranged differently, for example, with a longitudinal extent in the circumferential direction or perpendicular / tangential to the radial direction. The magnet receptacles 41 are then shaped / arranged accordingly.

[0083] The rotor core 40 is preferably at least substantially ring-shaped, (hollow) cylindrical and / or disk-shaped. The axis of rotation A preferably forms an axis of symmetry of the rotor core 40.

[0084] The rotor core 40 is attached to the shaft 60, in particular by force-fit, form-fit and / or material-fit connection to the shaft 60.

[0085] To secure the rotor core 40, the shaft 60 can have grooves or protrusions 61. When the rotor core 40 is mounted onto the shaft 60, the protrusions 61 dig into the rotor core 40 and thus secure it to the shaft 60. However, other solutions are also possible.

[0086] The rotor core 40 preferably comprises several, here ten, sector segments or sector sections 42, wherein a magnet receptacle 41 is formed between each pair of adjacent sector sections 42, or a permanent magnet 30 is accommodated. In particular, the magnet receptacles 41 are each laterally or circumferentially bounded by two sector sections 42.

[0087] Preferably, the rotor core 40 has an inner section 43 for receiving the shaft 60, which is annular or hollow cylindrical in shape. The sector sections 42 preferably extend radially from the inner section 43.

[0088] The sector sections 42 are preferably each wedge-shaped or pie-shaped and / or preferably each have a cross-section (orthogonal to the axis of rotation A) in the form of a circular sector.

[0089] The permanent magnets 30 magnetize or polarize the sector sections 42, in particular the sector sections 42 forming alternating north and south poles.

[0090] Preferably the magnet holders 41 are adapted to the shape of the permanent magnets 30 and / or have corresponding dimensions.

[0091] In the illustrated example, the magnet receptacles 41 are preferably slot-shaped or shaft-shaped, or form receiving slots or receiving shafts and / or extend in a radial direction.

[0092] The width of the magnetic recordings 41 or the distance between two adjacent sector sections 42 is preferably at least substantially constant.

[0093] The permanent magnets 30, magnet receptacles 41 and / or sector sections 42 are preferably evenly distributed over a circumference. Adjacent permanent magnets 30 therefore preferably enclose an angle of 360° divided by the number of permanent magnets 30. The same applies to the magnet receptacles 41 and sector sections 42.

[0094] Preferably, the rotor core 40 comprises or is formed from several stacked electrical steel sheets or rotor laminations 44. The rotor laminations 44 are shaped or stamped accordingly to create the magnet receptacles 41 or sector sections 42 of the rotor core 40.

[0095] In a radial direction, in particular radially inside or on their side facing the shaft 60 or axis of rotation A, the magnet receptacles 41 are preferably each limited by the inner section 43.

[0096] The magnetic receptacles 41 each have a (radial) stop 45.

[0097] In a radial direction, in particular radially outside or on their side facing away from the shaft 60 or axis of rotation A, the magnet receptacles 41 are preferably each limited by the stop 45.

[0098] The stop 45 can have a continuous stop surface or several separate stop surfaces 45A. In the illustrated example, the respective stop 45 is formed by several, here three, in particular point-shaped, stop surfaces 45A, as in particular Fig. 3 and 4 illustrate.

[0099] Preferably the stops 45 or their stop surfaces 45A are formed by the rotor core 40, particularly preferably by one, several or all rotor laminations 44.

[0100] However, solutions are also possible in which the stops 45 or stop surfaces 45A are formed by other or separate components that are arranged in or radially outside the magnet receptacle 41 or between each pair of sector sections 42.

[0101] Preferably, the stops 45 or the components forming them are connected to the respective sector sections 42 by force-fit, form-fit and / or material-fit.

[0102] For example, in an alternative embodiment (not shown), the assembly device 50 could have one or more walls extending in the axial direction, forming corresponding stops 45 or stop surfaces 45A.

[0103] In the illustrated example, the stops 45 or stop surfaces 45A are preferably formed by individual rotor laminations 44. For this purpose, the rotor core 40 has differently shaped rotor laminations 44, wherein a first shape has or forms stop surfaces 45A, while a second shape does not have such stop surfaces.

[0104] Preferably, several stop surfaces 45A are formed by a rotor plate 44, in particular one stop surface 45A for each magnet holder 41 (exactly).

[0105] In the illustrated example, several, here three, rotor laminations 44 with stop surfaces 45A are provided, between which rotor laminations 44 without stop surfaces are arranged, so that in the axial direction several, here three, in particular essentially point-shaped, stop surfaces 45A are formed per magnet holder 41.

[0106] However, solutions are also possible in which several rotor laminations 44 with stop surfaces 45A are stacked directly on top of each other, so that these rotor laminations 44 form a continuous stop surface 45A extending in the axial direction. Rotor laminations 44 without a stop surface 45A can then be arranged between such rotor lamination stacks.

[0107] It is also possible to form all rotor laminations 44 with stop surfaces 45A, so that a continuous stop surface 45A extending over the entire axial extent of the magnet holder 41 is formed.

[0108] The different rotor laminations 44 are preferably made of the same material, in particular stamped or cut from electrical steel.

[0109] The rotor 20 or rotor core 40 preferably has webs 46 which form or have the stops 45 or stop surfaces 45A.

[0110] The footbridges 46 are each arranged between two sector sections 42 or each form a bridge between two sector sections 42.

[0111] Preferably the webs 46 extend in the circumferential direction and / or are arranged radially outside or on the outer circumference of the rotor core 40.

[0112] Particularly preferably, one or more rotor laminations 44 have or form the webs 46. Such a rotor lamination 44 has, in particular, a closed outer circumference. In contrast, rotor laminations 44 that do not have stop surfaces 45A or webs 46 are preferably open at their outer circumference at the points where the magnet receptacles 41 are formed.

[0113] Fig. 5 Figure 1 shows an enlarged section of one of the webs 46 in detail. The remaining webs 46 are preferably designed identically.

[0114] The bridge 46 preferably has a thickening or nose 47, particularly in the center, which forms the stop surface 45A.

[0115] The nose 47 preferably extends orthogonally to the main direction of extension of the bridge 46 and / or in a radial direction and / or into the magnet receptacle 41. The nose 47 particularly creates a stop surface 45A that is at least substantially point-shaped.

[0116] Preferably the stop 45 or bridge 46 is designed to be spring-loaded / flexible, in particular to allow for tolerance compensation when inserting the permanent magnet 30.

[0117] This is achieved in particular by the fact that the stop 45 or bridge 46 – at least before the permanent magnet 30 is inserted into the magnet holder 41 – is bent or curved radially inwards (in the direction of the axis of rotation A or the shaft 60), as shown in Fig. 5 indicated by dotted lines.

[0118] When the permanent magnet 30 is inserted, it can happen that it presses so hard against the stop surface 45A, the nose 47, or the bridge 46 that the bridge 46 bends or gives way. However, the inner curvature prevents the bridge 46 from being pushed too far outwards and also prevents the diameter of the rotor core 40 (in the area of ​​the bridge 46) from increasing or becoming excessively larger.

[0119] Fig. 5 The enlarged section shows an example of the case where the bridge 46 is pressed outwards when the permanent magnet 30 is inserted, with the original position or curvature of the bridge 46 (before the permanent magnet 30 was inserted) shown as a dashed line. Depending on the size of the permanent magnet 30 and / or the force acting on it, however, it is also possible that the bridge 46 is pressed outwards less or not at all.

[0120] Particularly preferably, the rotor core 40 has the same or a smaller diameter in the area of ​​the stops 45 or webs 46 than in the area of ​​the sector sections 42, especially when a permanent magnet 30 is used. In other words, the distance or radius between the axis of rotation A and the stop 45 or web 46 is less than or equal to the distance or radius between the axis of rotation A and the outer circumference of the sector section.

[0121] The mounting device 50 is preferably attached to the shaft 60, in particular by force-fit, form-fit and / or material-fit. Preferably, the attachment is carried out in the same way as with the rotor core 40, for example by means of the projections 61 or an interference fit.

[0122] Additionally or alternatively, the mounting device 50 can be attached to the rotor core 40, in particular by force-fit, form-fit, and / or material-fit connection. For example, the mounting device 50 can be bonded, hot-stitched, and / or snapped to the rotor core 40 and / or form a snap connection. This will be discussed in connection with Fig. 9 We will go into more detail later.

[0123] It is also possible that the mounting device 50 is injection-molded onto the rotor core 40 and / or the shaft 60.

[0124] The assembly device 50 has a base body 51, several, here ten, fixing elements 52 and / or a fan section 53.

[0125] Preferably the mounting device 50, the base body 51 and / or the fan section 53 is made of plastic and / or formed in one piece, in particular injection molded.

[0126] The mounting device 50 and / or the base body 51 are preferably disc-shaped or plate-shaped and / or at least substantially ring-shaped or wheel-shaped and / or rotationally symmetrical. The axis of rotation A preferably forms an axis of symmetry of the mounting device 50 and / or the base body 51.

[0127] The base body 51 preferably has an outer section 51A, an inner section 51B and / or a connecting section 51C.

[0128] The terms "outer" and "inner" refer here to the position relative to the axis of rotation A or shaft 60. The outer section 51A is therefore at a greater distance from the axis of rotation A or shaft 60 than the inner section 51B.

[0129] The outer and / or inner sections 51A, 51B are preferably at least substantially annular. In particular, the outer section 51A and the inner section 51B are arranged concentrically to each other and / or spaced apart from each other (in a radial direction).

[0130] The inner section 51B is preferably placed on or connected to the shaft 60.

[0131] The connecting section 51C connects the outer section 51A to the inner section 51C and / or extends radially between sections 51A and 51B and / or is web-like or spoke-like. Preferably, several connecting sections 51C are formed.

[0132] The fan section 53 is preferably ring-shaped and / or extends in a radial direction from the base body 51, in particular the outer section 51A.

[0133] The mounting device 50 is designed as a fan by means of the fan section 53, or can be operated as a fan. For this purpose, the fan section 53 preferably has corresponding louvers or blades 53A or the like.

[0134] The fan section 53 or the mounting device 50 designed as a fan is designed to transport warm air away from the electric motor 1 (into the environment) and / or to supply cool air (from the environment) to the electric motor 1.

[0135] As part of the rotor 20, the mounting device 50 or the fan section 53 rotates around the axis of rotation A when the electric motor 1 is operated and can thus convey air accordingly.

[0136] The mounting device 50 is preferably arranged axially below or on the bottom side of the rotor core 40 - at least during the installation or assembly of the permanent magnets 30.

[0137] As mentioned at the outset, the terms "below", "bottom-side", etc., preferably refer only to the orientation of the electric motor 1 or rotor 20 when the permanent magnets 30 are installed, or the orientation shown in the figures. If the electric motor 1 is installed in a machine, this can also be done in a different orientation, in which the mounting device 50 is located, for example, above the rotor core 40.

[0138] The base body 51 of the mounting device 50, or its outer section 51A, axially limits the magnet receptacles 41, particularly (at least during the mounting of the permanent magnets 30) from below. The base body 51 or the outer section 51A forms an axial stop, an axial counter bearing, or one or more axial contact surfaces for the permanent magnets 30.

[0139] On the side opposite the mounting device 50, particularly from above, the magnet receptacle 41 is preferably open. The permanent magnets 30 can therefore be inserted into the magnet receptacle 41 from the side opposite the mounting device 50 or from above.

[0140] The assembly device 50, in particular the base body 51 or its outer section 51A, preferably has one or more contact elements or stop elements 54 which form the axial stop or the axial counter bearing or axial contact surfaces for the permanent magnets 30.

[0141] Preferably, the stop elements 54 are formed by, in particular, linear elevations or ribs, as in particular in Fig. 4 The stop elements 54 are shown. Here, they preferably extend circumferentially or transversely, in particular perpendicularly, to the radial direction and / or in the radial direction. Examples are shown in Fig. 4 two transversely extending stop elements 54A and two radially extending stop elements 54B are designated.

[0142] In the illustration example according to Fig. 4 Each permanent magnet 30 or each magnet receptacle 41 is assigned several stop elements 54, here three stop elements 54A extending transversely to the radial direction and / or two stop elements 54B extending radially. However, it is also possible to assign exactly one stop element 54 to each permanent magnet 30 or each magnet receptacle 41, or to design one stop element 54 for several permanent magnets 30 or magnet receptacles 41. For example, the mounting device 50, the base body 51, or the outer section 51A could have one or more circular stop elements 54 extending over all magnet receptacles 41.

[0143] Alternatively, the axial stop or the axial counter bearing or the axial contact surface can also be formed by a planar area of ​​the base body 51 or its outer section 51A.

[0144] The base body 51 or its outer section 51A has or forms reservoirs / receiving chambers 55.

[0145] The receiving chambers 55 serve to receive excess adhesive, which will be explained in more detail later in connection with the assembly procedure for mounting the permanent magnets.

[0146] The reservoirs / receiving chambers 55 are preferably tub-shaped, basin-shaped or trough-shaped, or designed as tubs, basins or troughs.

[0147] The receiving chambers 55 are preferably formed by corresponding (axial) recesses in the base body 51 or the outer section 51A.

[0148] The receiving chambers 55 are preferably arranged (directly) below the permanent magnets 30 or magnet receptacles 41.

[0149] Preferably, the receiving chambers 55 are laterally limited, in particular in the radial direction and / or circumferential direction, by one or more stop elements 54.

[0150] In the illustration example according to Fig. 4 Each permanent magnet 30 or each magnet holder 41 is assigned several receiving chambers 55. However, it is also possible to assign exactly one receiving chamber 55 to each permanent magnet 30 or each magnet holder 41, or to design one receiving chamber 55 for several permanent magnets 30 or magnet holders 41. In the latter case, the mounting device 50, the base body 51, or the outer section 51A could, for example, have one or more circular recesses / receiving chambers 55 that extend over all magnet holders 41.

[0151] The receiving chamber(s) 55 associated with a permanent magnet 30 or a magnet receptacle 41 preferably has a (common) receiving volume of at least 0.25 ml or 0.5 ml, in particular at least 1 ml or 2 ml, and / or of at most 10 ml, in particular at most 5 ml.

[0152] The fixing elements 52 are preferably arranged between the outer section 51A and the inner section 51B, as shown in particular in Fig. 4 The fixing elements 52 are preferably arranged between two connecting sections 52C. In other words, the outer section 51A, the inner section 51B, and the connecting sections 51C each form or delineate sectors, particularly circular, in which a fixing element 52 is arranged.

[0153] The fixing elements 52 are preferably evenly distributed over a circular circumference.

[0154] Preferably the fixing elements 52 are arranged radially inside the mounting device 50 or in the respective magnet receptacle 41 and / or close to the axis of rotation A or shaft 60.

[0155] Preferably, each permanent magnet 30 or each magnet receptacle 41 is assigned (exactly) one fixing element 52 and / or each magnet receptacle 41 has (exactly) one fixing element 52 projecting into it. However, solutions are also possible in which several fixing elements 52 are provided per magnet receptacle 41.

[0156] The structure and function of the fixing elements 52 are described using the Figuren 6 and 7 explained in more detail. Fig. 6 shows a schematic section of the proposed rotor 20 through two opposing magnet mounts 41 or permanent magnets 30 or along the axis of rotation A. Fig. 7 shows a corresponding section, which is shown enlarged in the area of ​​a magnet holder 41, namely before or during the insertion of the permanent magnet 30.

[0157] The preferred design and function are explained in more detail below using a fixing element 52 as an example. The descriptions preferably apply accordingly to the other fixing elements 52, which are preferably designed identically.

[0158] The fixing element 52 is preferably elongated, in particular arm-like.

[0159] The fixing element 52 preferably has a free end or head 52A, a connecting arm 52B and / or a fixed end or connection section 52C. The connecting arm 52B connects the head 52A and the connection section 52C to each other or is directly connected to the head 52A and the connection section 52C.

[0160] The fixing element 52 is connected to the base body 51 or formed in one piece, in particular with the inner section 51B and / or via its connecting section 52C.

[0161] Preferably the fixing element 52 is made of an elastic material and / or the same material as the base body 51, in particular plastic, preferably injection molded.

[0162] The fixing element 52 is designed to be flexible or bendable. In particular, the fixing element 52 can be bent or pivoted in a radial direction and / or about its fixed end or the connecting section 52C and / or relative to the base body 51.

[0163] The fixing element 52, in particular the connecting arm 52B, preferably extends at least substantially in the axial direction and / or projects transversely, in particular at least substantially vertically, from the base body 51.

[0164] It should be taken into account that the fixing element 52 or the connecting arm 52B does not have to extend exactly parallel to the axis of rotation A or shaft 60 due to its flexibility / bending ability, but can also form a (small) angle with the axis of rotation A or shaft 60 - both before and after the mounting of the permanent magnet 30.

[0165] The phrase "at least substantially in the axial direction" therefore preferably means that the fixing element 52 or the connecting arm 52B extends more in the axial direction than in the radial direction and / or forms an angle of less than 45° or 30°, in particular less than 20° or 10°, with the axis of rotation A or shaft 60.

[0166] At least before assembly, the (main) extent or longitudinal extent of the fixing element 52 or connecting arm 52B – in addition to the axial component – ​​preferably has a radially outwardly directed component, as shown in Fig. 7 depicted.

[0167] Preferably, the angle between the axis of rotation A or shaft 60 and the fixing element 52 or connecting arm 52B before the mounting of the permanent magnet 30 is at least 3°, in particular at least 5° and / or at most 15°, in particular at most 10°.

[0168] Preferably, the angle between the main extension direction of the base body 51 and the fixing element 52 or connecting arm 52B before the mounting of the permanent magnet 30 and / or before the mounting of the mounting device 50 on the rotor 20 is at most 87°, in particular at most 85° and / or at least 75°, in particular at least 80°.

[0169] Particularly preferably, the fixing element 52 or the connecting arm 52B encloses a larger angle with the axis of rotation A or shaft 60 before the permanent magnet 30 is mounted than in the mounted state of the permanent magnet, as also shown in the figures in Fig. 6 (assembled state) and Fig. 7 (unassembled state) shown.

[0170] In the assembled state, the fixing element 52 preferably extends substantially parallel to the axis of rotation A, as shown in Fig. 6 shown. However, depending on the radial extent of the permanent magnet 30, a deviation from this may still be present even in the assembled state.

[0171] Preferably the fixing element 52 is designed at least substantially in an L-shape, wherein the connecting section 52C forms a first leg and the connecting arm 52B, in particular with the head 52A, forms a second leg.

[0172] Preferably the connecting section 52C extends in a radial direction and / or the connecting arm 52B extends at least substantially in an axial direction.

[0173] In comparison to the connecting arm 52B, the connecting section 52C is preferably short, in particular with a longitudinal extent of less than one third or one quarter of the longitudinal extent of the connecting arm 52B, so that the main direction of extension of the fixing element 52 is given by the connecting arm 52B.

[0174] The main extent or axial extent of the fixing element 52 is preferably less than the axial extent of the magnet receptacle 41. In other words, the fixing element 52 preferably projects axially into the magnet receptacle 41, but not through the magnet receptacle 41.

[0175] Particularly preferably, the main extent or axial extent of the fixing element 52 is at least substantially half the axial extent of the magnet receptacle 41. In particular, the head 52A is arranged at least substantially centrally (in the axial direction) in the magnet receptacle 41.

[0176] The fixing element 52, in particular the head 52A, preferably has or forms a contact surface 52D for contact with the permanent magnet 30, in particular on its radially outwardly facing side.

[0177] The head 52A is preferably rounded, especially on its radially outer side or in the area of ​​the contact surface 52D.

[0178] On its upper side, or the side facing away from the connecting arm 52B, the head 52A preferably has a slope 52E for mounting the permanent magnet 30. This will be discussed in more detail later.

[0179] In the assembled state or with permanent magnet 30 inserted, as in Fig. 6 As shown, the fixing element 52, in particular its head 52A, presses against the permanent magnet 30 with its contact surface 52D, in particular a radially inner end face of the permanent magnet 30, and / or rests against it. Most preferably, the contact surface 52D rests against the permanent magnet 30 at least substantially axially in the center.

[0180] The fixing element 52 is preferably clamped against the permanent magnet 30 and / or exerts a radially outward force on the permanent magnet 30.

[0181] The fixing element 52 preferably presses outwards in a radial direction onto the permanent magnet 30 or presses the permanent magnet 30 against the stop 45 or the stop surface(s) 45A.

[0182] In particular, the permanent magnet 30 is fixed or clamped between the stop 45 or the stop surface(s) 45A and the fixing element 52 or its head 52A or the stop surface 52D.

[0183] Solutions are also possible in which the fixing element 52 forms an (axial) positive locking or a (axial) latching or snap connection with the permanent magnet 30, or in which the head 52A is designed as a locking lug.

[0184] For this purpose, the fixing element 52, in particular with the head 52A, can engage in a corresponding recess of the permanent magnet 30 or the like.

[0185] Alternatively, the fixing element 52 with the head 52A can also engage or overlap the permanent magnet 30 (on the magnet's upper surface or the side facing away from the mounting device 50) to form a positive fit or a snap-fit ​​connection, or to axially secure the permanent magnet 30. In this case, the fixing element 52 projects through the magnet receptacle 41.

[0186] The mounting device 50 can preferably be held on the rotor core 40 by means of the clamping and / or locking of the fixing elements 52 - in addition to or as an alternative to other fastenings / fastening options.

[0187] A preferred method for mounting or inserting a permanent magnet 30 into the rotor 20 or rotor core 40 is described below based on Fig. 7 explained in more detail. The remaining permanent magnets 30 are preferably mounted in the same way, so that the explanations apply accordingly.

[0188] During or before the assembly of the permanent magnet 30, the rotor core 40 and the mounting device 50 are preferably already attached to each other and / or to the shaft 60.

[0189] The magnet receptacle 41 is preferably laterally or circumferentially bounded or defined by each pair of adjacent sector sections 42, radially outside by the stop 45, radially inside by the inner section 43, and / or axially, in particular on the bottom side or from below, by the mounting device 50, in particular by the stop element(s) 54. On the side opposite the mounting device 50, in particular from above, the magnet receptacle 41 is preferably open.

[0190] Optionally, a guide device 70, in particular a guide rail, can be used during assembly to guide the permanent magnet 30 when inserting it into the magnet receptacle 41, in particular to prevent the permanent magnet 30 from tilting. However, the guide device 70 can also be omitted as required, for example, if the stop 45 has a continuous, axially extending surface and / or forms a guide for the permanent magnet 30.

[0191] Preferably, the guide device 70 is moved radially from the outside towards the magnet receptacle 41 or is arranged radially outside the magnet receptacle 41. For this purpose, the guide device 70 has, in particular, recesses 71 for the webs 46. Because of the recesses 71, the guide device 70 can project (radially) into the magnet receptacle 41 between the webs 46.

[0192] However, solutions are also possible in which the guide device 70 is inserted axially into the magnet holder 41 from the open side or from above, or is designed to do so.

[0193] The guide device 70 preferably has an axially extending guide surface or guide edge 72 along which the permanent magnet 30 can be guided.

[0194] Particularly preferably, the guide edge 72 and the stop surface(s) 45A of the stop 45 are spaced apart from each other such that the guide edge 72 is located radially further inward than the stop surface(s) 45A. The recesses 71 can be dimensioned accordingly for this purpose. In the embodiment with a guide device 70 inserted from above, this device preferably has a corresponding thickness (in the radial direction).

[0195] Particularly preferably, before inserting the permanent magnet 30, adhesive is applied to the magnet receptacle 41 or the lateral boundaries of the magnet receptacle 41, in particular to the two corresponding sector sections 42, especially on the upper or open side.

[0196] The permanent magnet 30 is inserted axially into the magnet receptacle 41 from the open side or from above, as shown in Fig. 7 This is indicated by an arrow R.

[0197] During insertion, the permanent magnet 30 is preferably guided along the guide edge 72. Due to the distance between the stop 45 or stop surface(s) 45A and the guide edge 72, the permanent magnet 30 is also radially spaced from the stop 45 or the stop surface(s) 45A. However, particularly if no guide device 70 is used or if the stop 45 acts as the guide, the permanent magnet 30 can also be in contact with or guided by the stop surface 45A during insertion.

[0198] When the permanent magnet 30 is partially, in particular about halfway, inserted into the magnet receptacle 41, the permanent magnet 30 preferably comes into contact with the fixing element 52, in particular the head 52A, or contact occurs between the permanent magnet 30 and the fixing element 52 or head 52A, in particular between the insertion chamfer 31 of the permanent magnet 30 and the chamfer 52E of the fixing element 52. It is also possible to provide only one chamfer, either on the permanent magnet 30 or on the fixing element 52, and to omit a corresponding counter-chamfer.

[0199] As the permanent magnet 30 is inserted further, it preferably presses, clamps, deforms, or bends the fixing element 52 radially inwards, particularly until the permanent magnet 30 has slid off the inclined surface 52E and / or the contact surface 52D comes into contact with the permanent magnet 30. The fixing element 52 is then preferably clamped (radially) against the permanent magnet 30.

[0200] The clamping or bending / deformation of the fixing element 52 is particularly favored by the inclined plane(s) 31, 52E and / or by the fact that the extension of the fixing element 52 also has a radially outwardly directed component at least before clamping / bending / deformation, as described above.

[0201] The permanent magnet 30 is then pushed further in the axial direction or insertion direction R into the magnet receptacle 41 until it is completely inserted into the magnet receptacle 41 or axially aligned / positioned. In particular, the permanent magnet 30 is pushed in the axial direction or insertion direction R into the magnet receptacle 41 until it axially abuts the mounting device 50 or the base body 51, in particular the stop element(s) 54, or comes into contact with it.

[0202] As mentioned previously, solutions are also possible in which the fixing element 52 is (additionally) locked to the permanent magnet, in particular by the head 52A engaging in a recess of the permanent magnet 30 or by overlapping the permanent magnet 30 on its upper side or on the side facing away from the mounting device 50. In this case, the engagement or overlapping preferably occurs as soon as the permanent magnet 30 is fully inserted or axially engaged. The head 52A is, in particular, arranged in a corresponding axial position or height in or above the magnet receptacle 41.

[0203] The permanent magnet 30 preferably carries the adhesive with it or downwards when inserted into the magnet holder 41, so that gaps between the permanent magnet 30 and the magnet holder 41, in particular the rotor core 40 or sector sections 42, are filled with adhesive.

[0204] Excess adhesive collects in or is introduced into the receiving chamber(s) 55. Particularly preferably, the excess adhesive in the receiving chamber(s) 55 additionally bonds the permanent magnet 30 to the mounting device 50.

[0205] The fixing element 52, which is clamped against the permanent magnet 30, exerts a radially outward force on the permanent magnet 30.

[0206] If no guide device 70 is used, the permanent magnet 30 is already positioned / aligned radially after axial alignment / positioning and is held or (pre-)fixed in this position by the fixing element 52. In particular, the fixing element 52 presses the permanent magnet 30 against the stop 45, so that it is clamped between the fixing element 52 and the stop 45.

[0207] If the guide device 70 is used, it is removed after axial positioning / alignment - if adhesive is used, before it has cured.

[0208] Due to the preferred spacing between the guide edge 72 and the stop 45 or stop surface(s) 45A, the permanent magnet 30 initially rests only against the guide edge 72, but not against the stop 45 or the stop surface(s) 45A (radially). If the guide device 70 is now removed, a gap therefore (temporarily) forms between the permanent magnet 30 and the stop 45. However, this gap is closed immediately after the guide device 70 is removed due to the preload of the fixing element 52.

[0209] Immediately after removal of the guide device 70, the fixing element 52, which is clamped against the permanent magnet 30, pushes or slides the permanent magnet 30 radially outwards until it abuts the stop 45 or the stop surface(s) 45A. The permanent magnet 30 is thus positioned radially by the fixing element 52.

[0210] In this positioning, the fixing element 52 partially relaxes. Preferably, however, the remaining preload is large enough to hold, clamp, or fix the permanent magnet 30 in position, in particular – if adhesive is used – to pre-fix it until the adhesive has cured.

[0211] However, an additional device (not shown) can optionally be used, which is inserted or clamped between the fixing element 52 and the inner section 43 to exert an additional radially outward force on the permanent magnet 30. For this purpose, the fixing element 52 is preferably chamfered on its radially inner side or the side opposite the stop surface 52D, as also shown in Fig. 6 and 7 As indicated. Such a device is preferably removed after the adhesive has hardened.

[0212] After the permanent magnet 30 has been mounted and / or the adhesive has cured, the mounting device 50 preferably remains on the rotor 20 or forms part of the rotor 20 or electric motor 1 in operation.

[0213] The proposed method enables simple, fast, reliable, cost-effective and / or safe mounting of the permanent magnet(s) 30. In particular, it ensures simple, safe and reliable positioning or (pre-)fixing of the permanent magnet(s) to the rotor or rotor core.

[0214] Individual procedural steps of the process may also be carried out in a different order and / or omitted.

[0215] Further embodiments of the proposed rotor 20, which can also be used accordingly for the proposed electric motor 1, are described below based on the Figuren 8 and 9 This section explains, focusing primarily on key differences and new aspects. The previous statements and explanations apply accordingly or additionally, even without repetition.

[0216] As previously described and in the Figuren 1 bis 7 As shown, the mounting device 50 is preferably designed as a fan or has the fan section 53. However, it is also possible to design the mounting device 50 without a fan function or without fan section 53. Fig. 8 shows the rotor 20 in a second embodiment with such a mounting device 50 in a Fig. 6 corresponding cut.

[0217] The second embodiment preferably differs from the first embodiment only in that no fan section 53 is provided on the mounting device 50. Otherwise, the rotor 20 and / or the mounting device 50 are preferably designed as in the first embodiment and, in particular, have the fixing elements 52 and / or receiving chambers 55. The preceding explanations therefore apply accordingly.

[0218] Preferably, the mounting device 50 of the second embodiment also remains on the rotor 20 or is attached to the rotor 20 as described for the first embodiment. Alternatively, however, it is also possible that the mounting device 50 is only used for positioning and / or pre-fixing the permanent magnets 30 and is subsequently removed again – in particular after the adhesive has cured.

[0219] As already mentioned in connection with the first embodiment, the mounting device 50 can also be connected to the rotor core 40 by force-fit, form-fit and / or material-fit (directly) in addition to or as an alternative to fastening to the shaft 60. Fig. 9 shows, by way of example, the rotor 20 according to a third embodiment with such a fastening. Fig. 9 Figure 1 shows a section along the rotation axis A through a sector section 42 of the rotor core 40.

[0220] To fasten the mounting device 50 to the rotor core 40, the mounting device 50 according to the third embodiment preferably has one or more fastening elements 56.

[0221] The fastening elements 56 are preferably formed in one piece with the base body 51 and / or from the same material, in particular plastic, preferably injection molded.

[0222] Preferably the fastening elements 56 are designed in a pin-like manner and / or project or extend, in particular from the base body 51, in an axial direction.

[0223] Preferably, the fastening elements 56 project into or engage with the rotor core 40, in particular its sector sections 42. Most preferably, the fastening elements 56 extend (completely) through the rotor core 40 or the respective sector sections 42.

[0224] In this case, several fastening elements 56 or only one fastening element 56 can be provided for each sector section 42. It is also possible that fewer fastening elements 56 are provided than sector sections 42, so that, for example, a fastening element 56 is provided only for every second sector section 42 (in the example with ten sector sections 42, therefore, only five fastening elements 56).

[0225] The fastening elements 56 are preferably evenly distributed over a circular circumference, particularly to avoid imbalances.

[0226] The rotor core 40 and the sector sections 42 preferably have corresponding openings 48 into which a fastening element 56 engages or projects. The openings 48 preferably extend axially. In particular, each rotor lamination 44 has corresponding holes, so that the stacked rotor laminations 44 together with the holes form the respective opening 48.

[0227] By means of the engagement of the fastening elements 56 in the rotor core 40, in particular the sector sections 42 or openings 48, the mounting device 50 is preferably connected to the rotor core 40 by force, form and / or material connection.

[0228] The fastening elements 56 particularly preferably each have a head 56A at their free end or at the end facing away from the base body 51. The head 56A is preferably arranged on the upper side of the rotor core 40 or sector section 42 or the uppermost rotor lamination 44.

[0229] The head 56A preferably has a larger diameter than the opening 48 or than the remaining section of the fastening element 56.

[0230] The fastening element 56, or head 56A, is particularly preferably hot-stitched to the rotor core 40. In this case, it is not necessary to form head 56A before assembly. Instead, head 56A can be produced by hot-stitching after the fastening element 56 has been inserted through the opening 48.

[0231] Alternatively or additionally, it is also possible to design the head 56A to be flexible, so that it can be pushed through the opening 48 during assembly. In that case, hot riveting may be unnecessary.

[0232] The head 56A preferably forms a positive fit with the rotor core 40. In this way, a positive-locking connection between the mounting device 50 and the rotor core 40 is preferably achieved. In the case of hot riveting, a material-bonded connection can also be formed.

[0233] Alternatively or additionally, a press fit or other connection between fastening element 56 and opening 48 may also be provided.

[0234] As mentioned at the outset, the rotor core 40 and the mounting device 50 can also be connected to each other in other ways, for example by means of a snap connection. The fastening elements 56 are then designed accordingly, for example as snap hooks or the like.

[0235] Alternatively or additionally, the mounting device 50 can also be fastened by clamping the fixing elements 52 to the permanent magnets 30 - and thus indirectly to the rotor core 40 - as already explained.

[0236] In the illustration example according to Fig. 9 The mounting device 50 includes the fan section 53. However, it is also possible to design the mounting device 50 according to the third embodiment without the fan section 53.

[0237] Preferably, the descriptions of the first and second embodiments apply accordingly to the third embodiment. In particular, the mounting device 50 according to the third embodiment also has the fixing elements 52 and / or receiving chambers 55. However, the fastening of the rotor core 40 and the mounting device 50 according to the third embodiment can, in principle, also be implemented independently of the fixing elements 52 and / or receiving chambers 55 or other features of the first or second embodiment.

[0238] Fig. 10 Figure 1 schematically shows a proposed food processor 100 for preparing food or processing foodstuffs. The food processor 100 is preferably an electrically operated, multifunctional food processor designed for chopping, stirring, mixing, and / or heating or cooking food.

[0239] The food processor 100 preferably has a base station 110 and / or a container 120 for receiving food.

[0240] The base station 110 and the vessel 120 are preferably electrically and / or mechanically connected or connectable, in particular to enable heating and / or mixing / stirring of the food in the vessel 120.

[0241] Fig. 10 The figure shows the food processor 100 in its usual state of use or in the connection position in which the container 120 is electrically and / or mechanically connected to the base station 110.

[0242] The base station 110 preferably has a receptacle 111 for receiving the vessel 120, at least partially and / or from the bottom. Particularly preferably, the vessel 120 can be inserted or suspended, at least partially, into the base station 110 in order to connect the vessel 120 mechanically and / or electrically to the base station 110.

[0243] The vessel 120 is equipped with a stirrer 121, in particular for grinding and / or mixing foodstuffs in the vessel 120. The stirrer 121 is preferably arranged at the bottom of the vessel 120 or rotatably mounted. The stirrer 121 preferably has several, in particular replaceable, stirring blades.

[0244] Preferably, the stirring blades have cutting edges or are designed as cutting edges to chop food.

[0245] The vessel 120 is mechanically connected or connectable to the base station 110 in order to drive the stirrer 121 by means of the base station 110.

[0246] For the purpose of driving the stirrer 121, the kitchen machine 100, in particular the base station 110, has the electric motor 1, which is connected or can be connected to the stirrer 121 via the shaft 60 - optionally via a shaft attachment - and / or - in the connection position - engages positively in the base of the container 120 from below.

[0247] Preferably, the axis of rotation A of the electric motor 1 corresponds to the axis of rotation of the stirrer 121 and / or a central axis of the vessel 120, which runs centrally through the vessel 120, as shown in Fig. 10 hinted at.

[0248] Preferably the central axis is a longitudinal or symmetry axis of the preferably elongated, cylindrical and / or at least substantially rotationally symmetric vessel 120.

[0249] The kitchen machine 100, in particular the base station 110, preferably has a power supply 112 to supply the electric motor 1, in particular its coils 11, and / or other equipment of the kitchen machine 100 with electric current.

[0250] Individual aspects, features and / or process steps of the present invention can be implemented independently, but also in any combination and / or sequence. Bezugszeichenliste:

[0251] 1 Electric motor 10 Stator 11 Coil 12 Stator core 12 A Stator lamination 12 B Coil section 13 Coil carrier 14 Connection device 14 A Electrical connection 14 B Connection carrier 20 Rotor 30 Permanent magnet 31 Lead-in chamfer 32 Flat side 40 Rotor core 41 Magnet mount 42 Sector section 43 Inner section 44 Rotor lamination 45 Stop 45 A Stop surface 46 Web 47 Nose 48 Opening 50 Mounting device 51 Base body 51 A Outer section 51 B Inner section 51 C Connection section 52 Fixing element 52 A Head 52 B Arm 52 C Connection section 52 D Mounting surface 52 E Bevel 53 Fan section 53 A Blade 54 Stop element 54 A Transverse stop element 54 Radially extending stop element 55 Receiving chamber 56 Fastening element 56A Head 60 Shaft 61 Protrusion 70 Guide device 71 Recess 72 Guide edge 100 Food processor 110 Base station 111 Receptacle 112 Power supply 120 Container 121 Stirrer A Rotation axis R Feed direction

Claims

1. Electric motor (1), in particular for a kitchen machine (100), with a rotor (20) and a stator (10), wherein the rotor (20) is rotatable about a rotation axis (A) relative to the stator (10), the rotor (20) having a rotor core (40) with magnet receptacles (41) which are each delimited radially outwardly by a radial stop (45), and wherein the rotor (20) has a plurality of permanent magnets (30), each permanent magnet (30) being inserted into a magnet receptacle (41), wherein the rotor (20) has a mounting device (50) with a base body (51) for mounting the permanent magnets (30) and the permanent magnets (30) are adhesively bonded to the rotor core (40) and / or the mounting device (50), wherein the mounting device (50) has at least partially flexible fixing elements (52) for fixing the permanent magnets (30), the fixing elements (52) each projecting from the base body (51) in axial direction into the magnet receptacles (41) and pressing the permanent magnets (30) in radial direction against the stops (45) and wherein the base body (51) of the mounting device (50) axially delimits the magnet receptacles (41) and forms respectively an axial stop for the permanent magnets (30), characterized in that the base body (51) forms one or more receiving chambers (55) for receiving adhesive when adhesively bonding the permanent magnets (30) to the rotor core (40) and / or to the mounting device (50).

2. Electric motor according to claim 1, wherein the mounting device (50) is integrally formed and / or is injection-molded.

3. Electric motor according to claim 1 or 2, wherein the rotor (20) comprises a fan for cooling the electric motor (1), wherein the fan comprises or forms the mounting device (50).

4. Electric motor according to one of the preceding claims, wherein the one or more receiving chambers (55) is / are formed below the permanent magnets (30).

5. Electric motor according to one of the preceding claims, wherein the mounting device (50) comprises or forms a stop element (54) as axial stop for one or more permanent magnets (30), wherein the stop element (54) laterally delimits one or more receiving chambers (55).

6. Electric motor according to one of the preceding claims, wherein the mounting device (50) has a plurality of receiving chambers for receiving adhesive, wherein each magnet receptacle (41) and / or each permanent magnet (30) is assigned at least one receiving chamber (55).

7. Electric motor according to one of the preceding claims, wherein the rotor core (40) comprises stacked rotor sheets (44), wherein the radial stops (45) for the permanent magnets (30) are formed by one, multiple or all rotor sheets (44).

8. Electric motor according to one of the preceding claims, wherein the radial stops (45) are formed as webs (46) and / or are bent radially inwards and / or into the respective magnet receptacles (41), and / or wherein the radial stops (45) each have lugs (47) which project in the radial direction into the magnet receptacles (41) and form a contact surface (45A) for the respective permanent magnet (30).

9. Electric motor according to one of the preceding claims, wherein the fixing elements (52) each extend into the magnet receptacles (41) at least substantially up to half of the axial extent of the magnet receptacles (41) and / or press at least substantially centrally onto a radially inwardly facing end face of the respective permanent magnet (30).

10. Electric motor according to one of the preceding claims, wherein the fixing elements (52) each have a head (52A) which presses with a radially outer contact surface (52D) against the permanent magnet (30) and / or rests thereon, preferably wherein the fixing elements (52) each have a connecting arm (52B) which adjoins their head (52A) and is flexibly connected to the base body (51) of the mounting device (50).

11. Electric motor according to one of the preceding claims, wherein the mounting device (50) has pin-like fastening elements (56) which project axially through the rotor core (40) and fasten the mounting device (50) to the rotor core (40), in particular wherein the fastening elements (56) are heat-staked to the rotor core (40) and / or form a snap connection.

12. Kitchen machine (100) with an electric motor (1) according to one of the preceding claims.

13. Method of assembling an electric motor (1) having a stator (10) and a rotor (20) rotatable relative to the stator (10) about a rotation axis (A), in particular an electric motor (1) according to one of claims 1 to 11, wherein the rotor (20) has a rotor core (40) with magnet receptacles (41) each of which is delimited radially outwardly by a radial stop (45), wherein a permanent magnet (30) is inserted into one of the magnet receptacles (41) and adhesively bonded to the rotor core (40), wherein a mounting device (50) of the rotor (20) with a base body (51) is used when adhesively bonding the permanent magnet (30), wherein, during insertion of the permanent magnet (30), an at least partially flexible fixing element (52) of the mounting device (50), which projects axially into the magnet receptacle (41), presses the permanent magnet (30) in radial direction against the associated stop (45) to fix the permanent magnet (30) during curing of adhesive, the fixing elements (52) each projecting from the base body (51) in axial direction into the magnet receptacles (41), and wherein the base body (51) of the mounting device (50) axially delimits the magnet receptacle (41) and forms an axial stop for the permanent magnet (30), characterized in that overdosed adhesive is received in a receiving chamber (55) formed by the base body (51) of the mounting device (50).

14. Method according to claim 13, wherein the permanent magnet (30) is inserted into the magnet receptacle (41) until it axially stops against the base body (51) or a stop element (54) formed by the mounting device (50).

15. Method according to claim 13 or 14, wherein during insertion of the permanent magnet (30) a guide device (70) is temporarily used, which forms a guide for the permanent magnet (30), in particular wherein the guide formed by the guide device (70) is spaced radially inwards from the stop (45), so that the permanent magnet (30) is pressed against the stop (45) only when the guide device (70) is removed.