ELECTRIC MOTOR, KITCHEN MACHINE AND MANUFACTURING PROCESS

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 manufacturing an electric motor.

[0002] Electric motors, for example in the form of brushless DC motors (BLDC motors) or switched reluctance motors (SR motors), are known from the prior art and have a stator and a rotor rotating relative to the stator.

[0003] In brushless DC motors, the stator is equipped with stator coils and the rotor with permanent magnets. 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] In switched reluctance motors, the stator is also equipped with stator coils, but the rotor has no permanent magnets or coils; instead, it consists entirely of electrical steel or similar materials. The torque in the rotor is generated solely by the reluctance force.

[0005] EP 3 618 229 A1 discloses a stator for a BLDC motor, particularly for pumps in dishwashers or washing machines. The stator is manufactured by stacking laminations and has a plurality of teeth for coils. Each tooth has a separate, individual winding core, which is produced by individually overmolding the tooth. Two of the winding cores form holders for contact terminals located on the outside of the stator, namely a star point terminal holder and a phase terminal holder, which can be formed integrally with the respective winding core. To manufacture the stator, a linear chain of individually overmolded stator teeth is first formed and then assembled into a ring.

[0006] DE 10 2017 206 091 B3 relates to an electric drive motor for a dishwasher pump. The electric drive motor has a stator with a stator core composed of several stacked individual laminations and coil formers on which stator windings are wound. The coil formers are formed by an injection-molded plastic body created by overmolding the stator core. A connector housing is also formed on the injection-molded plastic body, in which plug contacts connected to the stator windings are housed.

[0007] CN 103023262 A relates to a BLDC motor with a stator core, stator windings, and a stator insulator layer produced by injection molding onto and encasing the stator core. A separately manufactured PCB mounting block is positively connected to the stator insulator layer and located on the outer circumference of the stator core. A one-piece formation of the stator insulator layer and the PCB mounting block is described as disadvantageous for the purposes of CN 103023262 A.

[0008] US Patent 2016 / 0197530 A1 discloses a BLDC motor with a stator core and an insulator that forms an insulating layer on the surface of the stator core, the insulator including a protruding part. The insulator has hooks that hold a connector with contacts for the power supply.

[0009] CN 212085915 U relates to a retaining part for a stator that holds a thermostat. The retaining part is a separate component and is clamped to the stator laterally from the outside.

[0010] EP 0 438 981 A1 relates to an AC motor comprising a one-piece molded plastic "pack" around which a coil is wound. The "pack" has a pocket into which a temperature switch is inserted.

[0011] The present invention is based on the objective of providing an electric motor, a kitchen machine with an electric motor and a manufacturing method for an electric motor, wherein the electric motor has a simple, compact, stable and / or cost-effective design or enables simple, fast, compact, stable and / or cost-effective assembly / manufacturing, and / or wherein the electric motor has efficient operation, low noise emission, good heat dissipation and / or high power density.

[0012] 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.

[0013] The proposed electric motor has a (stationary) stator and a rotor that can rotate around a rotational axis relative to the stator.

[0014] The stator has a stator body / stator core, which is formed in particular by stacked stator laminations or electrical steel sheets. The stator core is therefore preferably a laminated core or stator core.

[0015] The stator or stator core is preferably at least substantially ring-shaped or concentrically surrounds the rotor. The ring axis or axis of symmetry of the stator or stator core preferably corresponds to the axis of rotation.

[0016] The stator has several coils and a coil carrier for the coils. Preferably, the coil carrier has corresponding winding sections on which the coils are wound or which hold / support the coils.

[0017] According to one aspect of the present invention, the coil carrier is manufactured in one piece by injection molding onto or overmolding the stator core.

[0018] Overmolding allows for preferably thinner wall thicknesses of the coil carrier, particularly thinner wall thicknesses than in prior art solutions such as a two-part coil carrier that is plugged onto the stator core. This enables a more compact design of the electric motor or stator, especially providing more space for coil windings.

[0019] Furthermore, overmolding results in a stiffer and / or more stable stator and / or ensures that the coil former rests directly against the stator core, is positively connected to the stator core in all spatial directions, and / or is bonded to the stator core by a material bond and / or adhesive bond. This prevents or at least reduces vibration of the coil former during operation of the electric motor. This advantageously leads to more efficient operation, lower noise emissions, and / or higher power density.

[0020] Furthermore, improved heat dissipation can be achieved through overmolding. Firstly, the coil former, due to its thinner wall thickness, acts as a less insulating material, allowing the heat generated by the coils to be dissipated more effectively. Secondly, heat dissipation is also improved by the direct contact between the coil former and the stator core, as this eliminates insulating air gaps or similar features.

[0021] Furthermore, there is no need for subsequent mounting of the coil carrier to the stator core, which contributes to simple, fast and / or cost-effective manufacturing.

[0022] According to a further aspect of the present invention, the coil carrier has at least one holder arranged radially outside the stator core or on the outer circumference of the stator core, in particular extending over the stator core. The holder supports a sensor device or parts thereof. Preferably, the holder is formed integrally with the coil carrier. Optionally, the holder can additionally support a connection device or parts thereof.

[0023] The mounting bracket allows for a particularly simple and / or compact way to hold and / or position the sensor unit, and optionally the connection unit. In particular, no installation space is required inside the stator. Furthermore, the mounting bracket, connection unit, and / or sensor unit are easily accessible from the outside, which simplifies installation.

[0024] The connection device may have electrical connection contacts for supplying power to the electric motor, in particular the coils, and / or a star point for connecting the coils. In Advantageously, the connection contacts and / or the star point are held radially outside the stator core by the bracket, thus requiring no installation space inside the stator and / or being more easily accessible electrically. For example, a potential from the star point can be tapped for motor control in this way.

[0025] Preferably, the connection device includes a terminal that forms the star point, or in which the coil wires of the various coils are joined to form a star point. This facilitates particularly simple, quick, and / or cost-effective manufacturing / assembly. Alternatively, the coil wires can also be soldered or welded to form a star point.

[0026] The sensor device can comprise one or more sensors, in particular a temperature sensor and / or a Hall sensor. Preferably, the temperature sensor detects the temperature of the electric motor, especially of the stator or coils, and / or the Hall sensor detects the angle of rotation or the rotational speed of the electric motor or rotor. The Hall sensor is therefore preferably configured as an angle sensor. Alternatively or additionally, the Hall sensor can also be used for other measurements and / or the angle of rotation can be detected by another sensor, for example, a photoelectric sensor. The sensor(s) thus preferably enable monitoring and / or control of the temperature and / or rotational speed of the electric motor, ensuring efficient operation and / or high power density.

[0027] The sensor(s) can be attached directly to the mounting bracket. However, it is also possible that only the electrical connection contacts of the sensor assembly for the corresponding sensors are directly attached to the mounting bracket. Consequently, the sensor(s) can also be held indirectly by the mounting bracket via a corresponding connection. Advantageously, such a connection is held radially on the outside of the stator core by the mounting bracket, thus requiring no installation space within the stator and / or being more easily accessible electrically.

[0028] Multiple, spaced-apart mounting brackets can also be provided. Two mounting brackets are particularly preferred, one serving as a connection bracket and holding the connection device, and the other serving as a sensor bracket and holding the sensor device. This results in a simpler and / or more compact design, as the components are, or can be, better distributed around the stator core. In particular, the individual mounting brackets can then be made smaller or more compact, since not all components need to be arranged on a single bracket. It is also possible to provide more than two mounting brackets, for example, for multiple sensors.

[0029] Preferably, the coil carrier is manufactured in one piece by injection molding onto the stator core, and the proposed mounting bracket(s) are provided. The mounting bracket, or each mounting bracket, which is in particular a section or part of the one-piece coil carrier, is then injection molded (outer) onto the stator core. This results in corresponding and synergistic advantages, in particular a simple and cost-effective design and manufacturing process, more efficient operation, lower noise emissions, and / or higher power density.

[0030] In general, the proposed electric motor has low noise emissions, high power density and / or a large speed range.

[0031] A wide speed range means that the electric motor can be operated over a large speed range, particularly at both low and high speeds. Speeds from 10 rpm to 10,000 rpm are especially preferred with the proposed electric motor.

[0032] Furthermore, the full torque can preferably be accessed at standstill and / or the electric motor can be controlled in a defined manner, in particular rotated in defined small angular ranges.

[0033] Another aspect of the present invention relates to a method for manufacturing an electric motor or a stator for an electric motor, in which a coil carrier of the stator is manufactured by injection molding onto a stator core and in which a coil carrier is manufactured with at least one holder which is arranged radially outside on the stator core and is designed to hold a sensor device, optionally additionally a connection device.

[0034] In particular, in the proposed method, the coil carrier is manufactured in such a way that it surrounds the stator core and / or is materially bonded and / or adhesively connected to the stator core and / or forms a positive connection with the stator core in the axial, radial and circumferential directions.

[0035] The proposed method offers certain advantages. In particular, the previously described electric motor and its stator can be manufactured using the proposed method.

[0036] Another aspect of the present invention relates to a kitchen machine with a proposed electric motor and / or an electric motor manufactured using the proposed method.

[0037] 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.

[0038] Using the proposed electric motor in a food processor offers several advantages. In particular, it benefits from low noise emissions, efficient operation, and / or improved controllability.

[0039] Furthermore, the wide speed range in which the electric motor can operate is particularly advantageous for use in a food processor. Depending on the set speed, both stirring and chopping of food can be achieved. The proposed electric motor preferably also allows for slow stirring, which permits a greater variety of recipes. In addition, it preferably enables precise chopping of ingredients, which contributes to better preparation and / or improved appearance of the dishes.

[0040] Furthermore, due to its compact, flat and simple design, the proposed electric motor can be arranged in the kitchen machine in a particularly space-saving manner.

[0041] In principle, the electric motor can also be used in other devices, such as a vacuum cleaner or robotic vacuum cleaner.

[0042] 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.

[0043] When only the stator is described, the corresponding terms preferably refer to the (imaginary) axis of rotation when the rotor is installed. However, the terms can also refer to the annular axis / axis of symmetry of the stator or stator core, which preferably coincides with the axis of rotation.

[0044] Terms such as "top", "bottom", and the like preferably refer to the extent of the rotation axis of the rotor or the axis of symmetry of the stator or stator core. In particular, "top" refers to an axial end face of the component in question, especially of the electric motor, rotor, rotor core, stator and / or stator core, and "bottom" refers to the other or opposite axial end face of the component in question, especially of the electric motor, rotor, rotor core, stator and / or stator core.

[0045] The terms are used here according to the preferred orientation of the electric motor. However, it should be noted that the electric motor can also be installed in a different orientation in a food processor or other device.

[0046] 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 proposed stator and rotor; Fig. 2 an exploded view of the stator according to Fig. 1 ; Fig. 3 a to Fig. 1 Corresponding perspective view of a proposed stator according to a second embodiment; Fig. 4 an exploded view of the stator according to Fig. 3; Fig. 5 a section of the stator according to Fig. 3 Fig. 6 shows a further perspective view of the proposed stator according to the second embodiment; Fig. 7 shows a perspective view of the connection contacts of the proposed stator; Fig. 8 shows a top view of the proposed electric motor with the stator according to the second embodiment, a bearing bridge and a rotation angle sensor; and Fig. 9 shows a side view of a proposed kitchen machine.

[0047] 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.

[0048] For better clarity, not all identical parts and components within a figure are marked with a reference symbol.

[0049] The in the Figure 1 and 2 The first embodiment shown does not include a sensor holder and is therefore not according to the invention. The descriptions and explanations for the first embodiment also apply to the second embodiment according to the invention, unless explicitly stated otherwise or differences are pointed out.

[0050] Fig. 1 Figure 1 shows a proposed electric motor 1 in a schematic, perspective view.

[0051] In the illustrated embodiment, the electric motor 1 is designed as a brushless DC motor (BLDC motor). However, other solutions are also possible in principle. In particular, the proposed stator 2 could also be used and advantageously in a reluctance motor, especially a switched reluctance motor (SR motor).

[0052] The proposed electric motor 1 preferably has a large speed spread or can be operated over a wide speed range. Preferably, the minimum speed is less than 100, 50, or 20 rpm, in particular less than or equal to 10 rpm, and / or the maximum speed is greater than 2000, 5000, or 8000 rpm, in particular greater than or equal to 10,000 rpm.

[0053] The electric motor 1 has a (stationary) stator 2 and a (rotating) rotor 3, wherein the rotor 3 is rotatable about an axis of rotation A relative to the stator 2.

[0054] As mentioned at the beginning, terms such as "axial", "radial" and the like preferably refer to the axis of rotation A.

[0055] Optionally, the electric motor 1 can have a housing, or the stator 2 and / or rotor 3 can be arranged in a housing (not shown).

[0056] In the illustrated example, the electric motor 1 is designed as an internal rotor motor, or the rotor 3 is at least partially arranged inside the stator 2.

[0057] In the illustration example according to Fig. 1 The rotor 3 preferably has several, here ten, permanent magnets 4, a rotor core 5, a fan 6 and / or a shaft 7.

[0058] The permanent magnets 4 are preferably arranged or embedded in the rotor core 5.

[0059] The permanent magnets 4 are preferably arranged in a star shape in the rotor 3 or rotor core 5 and / or around the shaft 7 or axis of rotation A and / or extend or have a main / longitudinal extent - with respect to the shaft 7 or axis of rotation A - in a radial direction.

[0060] The permanent magnets 4 are preferably evenly distributed over a circumference. Adjacent permanent magnets 4 therefore preferably enclose an angle of 360° divided by the number of permanent magnets 4.

[0061] In principle, the permanent magnets 4 can also be shaped and / or arranged differently than in the illustration example, for example with a longitudinal extent in the circumferential direction or perpendicular / tangential to the radial direction.

[0062] The rotor core 5 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 5.

[0063] The rotor core 5 is attached to the shaft 7, in particular by force-fit, form-fit and / or material-fit connection to the shaft 7.

[0064] Preferably the rotor core 5 comprises or is formed from several stacked electrical steel sheets or rotor sheets.

[0065] The fan 6 is preferably attached to the shaft 7, in particular by force-fit, form-fit, and / or material-fit. Additionally or alternatively, the fan 6 can be attached to the rotor core 5, in particular by force-fit, form-fit, and / or material-fit. It is also possible that the fan 6 is injection-molded onto the rotor core 5 and / or the shaft 7.

[0066] Preferably the fan 6 is made of plastic and / or formed in one piece, in particular injection molded.

[0067] The fan 6 is 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 fan 6.

[0068] The fan 6 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.

[0069] As part of the rotor 3, the fan 6 rotates around the axis of rotation A when the electric motor 1 is operating and can thus pump air accordingly.

[0070] The rotor 3 shown and described is only an example. In particular, the electric motor 1 can also be designed as a (switched) reluctance motor, as mentioned at the beginning. The rotor 3 is then designed accordingly; for example, in a reluctance motor, it does not have permanent magnets.

[0071] Fig. 2 shows the stator / stand 2 of the electric motor 1 in a schematic exploded view.

[0072] The stator 2 has several, here twelve, windings / coils 10, a stator core 20, a coil carrier 30 and / or a connection device 40.

[0073] The stator core 20 preferably comprises several stacked electrical steel sheets or stator laminations 27, which form several, here twelve, stator teeth or coil sections 23, wherein each winding / coil 10 is wound around a coil section / stator tooth 23 and / or each coil section / stator tooth 23 extends through a coil 10.

[0074] In the proposed stator 2, the coil carrier 30 is provided, which supports the coils 10, as shown in Fig. 1 depicted.

[0075] The coil carrier 30 is formed in one piece by injection molding onto the stator core 20.

[0076] The coils 10 can preferably be supplied with power via the connection device 40. Preferably, the connection device 40 has one or more electrical connections 41.

[0077] The electrical connections 41 are supported by a connection bracket 41, which is integral with the coil carrier 30 or forms part of the coil carrier 30.

[0078] A second embodiment of the stator 2 according to the invention is described below with reference to Figures 3 to 8 The descriptions and explanations for the first embodiment also apply to the second embodiment and vice versa, unless explicitly stated otherwise or differences are pointed out.

[0079] Fig. 3 Figure 2 shows the stator 2 according to the second embodiment in a schematic, perspective view, which is used to depict the stator 2 according to the first embodiment. Fig. 1 corresponds. Fig. 4 shows the stator 2 according to the second embodiment in a Fig. 2 corresponding, schematic exploded view. Fig. 5shows a schematic section through the stator 2 according to the second embodiment along a plane in which the axis of rotation A lies and which passes through the terminal bracket 41.

[0080] The following description of the stator core 20 preferably applies to both the first and the second embodiment or other embodiments with a corresponding stator core 20.

[0081] The stator core 20 is preferably at least substantially ring-shaped or ring-like. In particular, the stator core 20 has an opening 21 for the rotor 3, which preferably has a cylindrical shape.

[0082] The stator 2, stator core 20, or the opening 21 preferably has an axis of symmetry, annular axis, or cylindrical axis. This preferably refers to the axis that runs (centrally) through the opening 21 or to which the stator core 20 is arranged concentrically.

[0083] The stator core 20 is particularly preferred to be symmetrical with respect to a rotation of 90° around said axis.

[0084] The axis of rotation A preferably corresponds to the axis of symmetry, the ring axis, or the cylinder axis of the stator 2, the stator core 20, or the opening 21, or coincides with it. This is particularly advantageous in Fig. 1 The first embodiment is shown, but preferably it also applies analogously to the second embodiment.

[0085] Consequently, the stator 2, stator core 20 and / or the opening 21 are preferably designed symmetrically to the axis of rotation A and / or the axis of rotation A runs centrally through the stator 2, stator core 20 or the opening 21.

[0086] In connection with the stator 2, stator core 20 and / or the opening 21, the terms "axial", "radial" and the like can therefore preferably also be understood as referring to their axis of symmetry, ring axis or cylinder axis.

[0087] In the following, the electric motor 1 and the stator 2 will therefore only be described in connection with the axis of rotation A. However, the term "axis of rotation A" can also be replaced in the description by the terms "axis of symmetry", "ring axis" or "cylindrical axis", especially when describing the stator 2 or its components.

[0088] The stator core 20 preferably has a stator yoke 22 that is at least substantially annular.

[0089] The stator teeth 23 protrude or extend from the stator yoke 22 or an inner surface 22B of the stator yoke 22 preferably (radially) inwards or in the direction of the axis of rotation A or of the rotor 3.

[0090] The stator core 20 preferably has one or more, in the illustrated example four, projections 24 which extend (radially) outwards, in particular from the stator yoke 22 or an outer surface 22A of the stator core 20 or stator yoke 22.

[0091] The terms "outside" and "inside" preferably refer to the axis of rotation A; the outside 22A is therefore preferably further away from the axis of rotation A than the inside 22B.

[0092] In the illustrations according to the first and second embodiments, the outer surface 22A of the stator yoke 22 is preferably octagonal and / or the inner surface 22B is dodecagonal. The corners / edges formed by the stator yoke 22 with the stator teeth 23 or the projections 24 are disregarded.

[0093] The outer surface 22A preferably forms the outer surface of the stator core 20 or stator yoke 22.

[0094] Preferably, the outer surface 22A has both flat and curved sides, which are particularly preferably arranged alternately. In the illustrated example of an octagonal outer surface 22A, which thus also has eight sides, preferably four sides are flat and four sides are curved.

[0095] The projections 24 preferably extend (centrally) from one of the curved side surfaces outwards.

[0096] However, other solutions are also possible. For example, all side surfaces could be flat. Alternatively, the outer surface 22A could be round or have a circular cross-section.

[0097] The side surfaces of the inner surface 22B are preferably all flat, but can also be curved if required. Preferably, one stator tooth 23 extends along each side surface.

[0098] Examples include the Figure 1 and 2 the first embodiment and the Figures 3 and 4 The second embodiment shows differently shaped projections 24. In the second embodiment, the projections 24 have a rectangular shape (in cross-section perpendicular to the axis of rotation A). In the first embodiment, the projections 24 have additional extensions at their radially outer end, or are approximately T-shaped.

[0099] The stator core 20, and in particular the projections 24, preferably have screw holes 24A. In particular, each projection 24 has one screw hole 24A. The screw holes 24A preferably extend axially through the stator core 20 or the projections 24.

[0100] Preferably, the screw holes 24A extend completely through the stator core 20 or the projections 24. However, it is also possible that the screw holes 24A extend only to a certain depth into the stator core 20 or the projections 24. In In this case, preferably corresponding screw holes 24A are formed on both axial end faces or on the upper and lower sides of the stator core 20 or the projections 24.

[0101] The screw holes 24A are primarily used to fasten bearing bridges 60 to the stator 2 or stator core 20. This will be discussed further later in connection with Fig. 8 explained in more detail. Generally, screw holes 24A can also be used for mounting housing parts or the like.

[0102] The stator teeth 23 preferably each have a tooth body 23A that is at least substantially cuboid in shape and / or a tooth head 23B.

[0103] The tooth head 23B is arranged at the free end or the end facing away from the stator yoke 22 or the end facing the opening 21, the axis of rotation A or the rotor 3, of the stator tooth 23 or tooth body 23A.

[0104] The stator teeth 23, in particular their tooth heads 23B, preferably each have a (concave) curved tooth head surface 23C facing the opening 21 or the axis of rotation A or the rotor 3.

[0105] The stator teeth 23, in particular the tooth heads 23B or their tooth head surfaces 23C, preferably limit or define the opening 21 (radially).

[0106] A winding space or coil space 25 is preferably formed between two adjacent stator teeth 23, in particular between the tooth bodies 23A. The winding spaces 25 serve in particular to accommodate the coils 10, as shown in Fig. 3 depicted.

[0107] The winding spaces 25 are preferably each bounded or defined by two adjacent stator teeth 23, in particular their tooth bodies 23A and / or tooth heads 23B, and the stator yoke 22, in particular its inner surface 22B. In particular, the winding spaces 25 are each bounded circumferentially by two adjacent tooth bodies 23A and / or radially by the stator yoke 22 or its inner surface 22B and by two adjacent tooth heads 23B.

[0108] The stator 2 or stator core 20 preferably has (exactly) twelve winding spaces 25.

[0109] Adjacent tooth heads 23B are preferably spaced apart from each other. In particular, a slot 26 is formed between two adjacent tooth heads 23B.

[0110] The slot 26 is preferably located between the opening 21 and the respective winding space 25 or forms a transition from the opening 21 to the respective winding space 25.

[0111] The stator teeth 23 or tooth heads 23B, in particular the tooth head surfaces 23C, preferably form an at least substantially cylindrical inner surface of the stator core 20. This inner surface is preferably not continuous, but interrupted by the slots 26.

[0112] Preferably, the stator core 20 has a substantially constant thickness, height, or axial extent. In particular, the components of the stator core 20, such as the stator yoke 22, the stator teeth 23, and the projections 24, have at least substantially the same axial extent.

[0113] The thickness, height, or axial extent of the stator core 20, in particular of the laminated core consisting of stacked stator laminations 27, is preferably more than 10 mm, particularly more than 15 mm or 18 mm, and / or less than 30 mm, particularly less than 25 mm or 22 mm. Most preferably, the thickness, height, or axial extent of the stator core 20 is approximately 20 mm.

[0114] The inner diameter of the stator core 20 or the diameter of the opening 21 is preferably larger than 50 mm or 60 mm, particularly larger than 70 mm, and / or smaller than 100 mm or 90 mm, particularly smaller than 85 mm or 80 mm. Particularly preferably, the inner diameter of the stator core 20 or the diameter of the opening 21 is approximately 77.6 mm.

[0115] The inner diameter of the stator core 20 is preferably the distance between two opposing stator teeth 23 or their tooth heads 23B or tooth head surfaces 23C.

[0116] The maximum (outer) diameter of the stator core 20, particularly taking into account the projections 24, in particular the distance from the outer surface of a projection 24 to the outer surface of the opposite projection 24, is preferably at least 130 mm, in particular at least 140 mm or 150 mm, and / or at most 180 mm, in particular at most 170 mm or 160 mm, particularly preferably about 155 mm.

[0117] The (minimal) outer diameter of the stator core 20 or stator yoke 22 or the distance between two opposing (flat / planar) side surfaces of the outer surface 22A is preferably at least 100 mm, in particular at least 110 mm or 120 mm, and / or at most 150 mm, in particular at most 140 mm, particularly preferably about 130 mm or 131 mm.

[0118] The (minimal) yoke thickness of the stator yoke 22, i.e. the (minimal) extent of the stator yoke 22 between its outer surface 22A and its inner surface 22B, is preferably at least 5 mm, in particular at least 6 mm or 7 mm, and / or at most 15 mm, in particular at most 12 mm, particularly preferably between 9 mm and 10 mm, most preferably about 9.45 mm.

[0119] The radial extent of a stator tooth 23, i.e., the extent from the stator yoke 22 to the tooth head surface 23C, is preferably at least 10 mm, particularly at least 15 mm, and / or at most 25 mm, particularly at most 22 mm. Particularly preferably, the radial extent is approximately 17 mm, most preferably 17.25 mm.

[0120] The radial extent of a tooth head 23B or of the slot 26 bounded by the tooth head 23B is preferably at least 1 mm and / or at most 3 mm, particularly preferably about 2 mm.

[0121] The radial extent of the tooth body 23A is therefore particularly preferably 15 mm, most preferably 15.25 mm.

[0122] The tooth body 23A preferably has a width or extent in the circumferential direction that is at least substantially constant. The width of a tooth body 23A preferably corresponds to the distance between two adjacent winding spaces 25.

[0123] The width of the tooth body 23A or the stator tooth 23 in the area between the stator yoke 22 and the tooth head 23B, or the distance between two adjacent winding spaces 25, is preferably at least 10 mm, particularly at least 12 mm, and / or at most 20 mm, particularly at most 18 mm. Particularly preferably, the width or distance is approximately 14 mm.

[0124] The width of the tooth head 23B, or the extent of the tooth head 23B, in particular its tooth head surface 23C, in the circumferential direction, is preferably greater than the width of the tooth body 23A, in particular by more than 1 mm and / or less than 3 mm. The width of a tooth head 23B preferably corresponds to the distance between two adjacent slots 26.

[0125] The distance between two adjacent tooth heads 23B or the width of the slot 26 or the extent of the slot 26 in the circumferential direction is preferably at least 2 mm and / or at most 6 mm, in particular between 4 mm and 5 mm, most preferably about 4.44 mm.

[0126] As mentioned at the outset, the stator core 20 preferably comprises or is formed from several stacked electrical steel sheets or stator laminations 27. The stator laminations 27 are shaped or stamped accordingly to form the previously described shape of the stator core 20, in particular the stator yoke 22 and the stator teeth 23.

[0127] The shape of a single stator lamination 27 preferably corresponds to the previously described shape of the stator core 20, with the difference that the stator lamination 27 has only a small axial extent or is flat, in particular approximately two-dimensional. The preceding and following descriptions of the shape of the stator core 20 or parts thereof, for example the stator teeth 23, therefore preferably also apply to the stator laminations 27.

[0128] Preferably, the thickness or axial extent of a stator lamination 27 is at most 1 mm, in particular at most 0.7 mm and / or at least 0.2 mm, in particular at least 0.4 mm. Particularly preferably, the thickness or axial extent of a stator lamination 27 is approximately 0.5 mm.

[0129] The stator laminations 27 are preferably formed in one piece, in particular as a single piece punched or cut out from a (electrical steel) blank.

[0130] The stator laminations 27 can have connection areas or punched areas 27A for connecting the individual stator laminations 27. These are preferably raised areas or recesses in the respective stator lamination 27, which ensure a defined cohesion of the stator laminations 27.

[0131] Preferably the punching areas 27A are provided (exclusively) on the stator yoke 22 and / or arranged to the left and right or adjacent to a screw hole 24A and / or arranged centrally to a stator tooth 23.

[0132] In the illustrated example, each stator lamination 27 preferably has eight punched areas 27A. In particular, in the illustrated example, there are four stator teeth 23 without an associated punched area 27A.

[0133] The punching areas 27A are preferably designed as points and / or lines.

[0134] The stator laminations 27 are or were preferably compressed or compacted with a force of more than 30 kN, 40 kN or 50 kN, and / or less than 80 kN or 70 kN, particularly preferably with a force of about 60 kN, to form the stator core 20.

[0135] The stator core 20 consists of or preferably comprises at least 30, in particular at least 35, and / or preferably at most 50, in particular at most 45 stator laminations 27. Particularly preferably the stator core 20 consists of or comprises about 40 stator laminations 27.

[0136] The number of stator laminations 27 can be variable. In particular, this allows the thickness of the stator core 20 to be varied depending on the number of stator laminations 27 and / or, given a fixed thickness of the stator core 20, to compensate for thickness tolerances in the individual stator laminations 27.

[0137] The number of stator laminations 27 can preferably vary by more than one lamination and / or by fewer than fifteen laminations, particularly by a maximum of ten laminations. The number of stator laminations 27 is particularly preferably 40 ± 5 laminations.

[0138] As previously explained, the stator core 20, and thus also each stator lamination 27, is preferably symmetrical with respect to a rotation of 90° about the axis of rotation A. This rotational symmetry results in particular from the four projections 24.

[0139] When manufacturing the stator core 20, the stator laminations 27 are preferably laid on top of each other rotated by 90° each. This preferably compensates for height inaccuracies of the stator laminations 27.

[0140] The stator laminations 27 are usually rolled, cut, or stamped from rolled electrical steel. Rolled electrical steel typically exhibits small grooves in the rolling direction. In a stator 2 whose laminations 27 are rotated by 90° during stacking, the direction of the grooves consequently also changes by 90°. This manufacturing process is therefore also recognizable in the finished product.

[0141] The coil carrier 30 preferably has several coil holders / winding sections 31 for the coils 10 and at least one holder 32, 33 for a sensor device 50, optionally for a connection device 40.

[0142] In the non-inventive representation example according to the first embodiment, as shown in Fig. 1 and Fig. 2 As shown, the coil carrier 30 has only one connection bracket 32 ​​for a connection device 40, whereas in the illustration example according to the second embodiment, as shown in Figs. 3 to 6 and 8As shown, both a connection bracket 32 ​​for a connection device 40 and a sensor bracket 33 for a sensor device 50 are provided. In principle, however, other solutions are also possible according to the invention, for example a single bracket for the connection device 40 and the sensor device 50, or more than two brackets 32, 33, for example to hold several sensors by means of several (sensor) brackets.

[0143] Mounting brackets 32, 33 and the devices 40, 50 held by them will be described later with reference to Figs. 6 to 8 discussed in more detail.

[0144] The following description of the coil carrier 30 with reference to the Figures 1 to 5 preferably applies to both the first and second embodiments or other corresponding embodiments with more or fewer supports.

[0145] The coil carrier 30 is formed in one piece, namely by injection molding or overmolding the stator core 20.

[0146] Preferably the coil carrier 30 is made of plastic and / or consists of plastic, in particular polyamide, especially preferably polyamide of type PA6.

[0147] Preferably, the coil carrier 30 surrounds, encloses, or encases the stator core 20, at least partially. Particularly preferably, the coil carrier 30, or its winding sections 31, completely surrounds or encases the tooth bodies 23A of the stator teeth 23.

[0148] The coil carrier 30 is preferably positively locked to the stator core 20, particularly in all spatial directions, i.e., axially, radially, and circumferentially. The positive locking is preferably implemented such that the coil carrier 30 is held immovably on the stator core 20 (in all spatial directions).

[0149] The coil carrier 30 preferably rests directly against the stator core 20, in particular without air gaps or the like, as shown by way of example in the section according to Fig. 5depicted.

[0150] The coil carrier 30 is particularly preferably bonded to the stator core 20 by a material bond and / or adhesive bond. This is achieved in particular by injection molding / overmolding, in which the plastic preferably adheres to the stator core 20. An adhesive agent can additionally be added to the plastic, which enhances or enables the adhesion to the stator core 20.

[0151] The wall thickness of the coil support 30 is preferably greater than 1 mm and / or less than 3 mm, in particular less than 2 mm. In particular, the wall thickness of the coil support 30 is less than in prior art solutions such as a two-part coil support that is plugged onto the stator core.

[0152] The coil carrier 30 preferably has one winding section 31 per stator tooth 23, in the illustrated example twelve winding sections 31. The winding sections 31 preferably extend (radially) from an at least substantially circular collar 34 inwards or in the direction of the axis of rotation A or of the rotor 3 or along the stator teeth 23, in particular the tooth body 23A.

[0153] In the illustrated example, the coil carrier 30 preferably has two collars 34, namely a first collar 34A and a second collar 34B.

[0154] The collars 34A, 34B preferably lie (directly) on the stator core 20, in particular the stator yoke 22, or are injection-molded onto it. The first collar 34A preferably lies (directly) on a first axial end face or top surface of the stator core 20, in particular the stator yoke 22, and the second collar 34B lies (directly) on the opposite axial end face or bottom surface of the stator core 20, in particular the stator yoke 22.

[0155] Preferably, the stator core 20 is axially fixed between the first collar 34A and the second collar 34B, or an axial positive fit is formed.

[0156] Preferably, the coil carrier 30 is fixed to the stator core 20 in the axial direction by the collars 34A, 34B, or positively connected to it. In particular, the collars 34A, 34B each bear against the axial end faces of the stator core 20 and thus prevent any movement of the coil carrier 30 relative to the stator core 20 in the axial direction.

[0157] The first collar 34A and / or the second collar 34B are particularly preferably connected to the stator core 20 or stator yoke 22 by means of a material bond and / or adhesive bond.

[0158] The collars 34A and / or 34B preferably only partially or not completely cover the stator yoke 22.

[0159] A connecting wall 35 preferably extends between the first and second collars 34A, 34B and / or between two adjacent winding sections 31. In particular, the respective connecting wall 35 extends axially between the two collars 34A, 34B and / or circumferentially between the two adjacent winding sections 31.

[0160] The connecting walls 35 preferably lie (directly) against the stator core 20, in particular against the inner surface 22B of the stator yoke 22, or are injection-molded onto it. Particularly preferably, the connecting walls 35 are bonded to the stator core 20, in particular to the inner surface 22B of the stator yoke 22, by a material bond and / or adhesive bond.

[0161] Preferably, the coil carrier 30 is fixed to the stator core 20 in a radial direction by the connecting walls 35, or positively connected to it. In particular, the connecting walls 35 bear against the inner surface 22B or the circumference of the stator yoke 22, thus preventing any movement of the coil carrier 30 relative to the stator core 20 in a radial direction.

[0162] The connecting walls 35 can extend in the axial direction beyond the respective collars 34A, 34B, for example to form guide projections for guiding coil wire 11 or the like.

[0163] The winding sections 31 are preferably each formed at least substantially in the shape of a (hollow) cuboid. In particular, the winding sections 31 each have a window or a through-opening 36 or define a window or a through-opening 36 through which a stator tooth 23 extends.

[0164] The respective winding section 31 preferably completely encloses, surrounds, or covers the tooth body 23A. In particular, the respective winding section 31 covers the tooth body 23A axially (from both sides) and on the respective side surfaces of the tooth body 23A facing the winding spaces 25.

[0165] The winding sections 31 preferably lie (directly) on the stator core 20, in particular on the respective stator teeth 23 or tooth bodies 23A, or are injection-molded onto them. Particularly preferably, the winding sections 31 are bonded to the stator core 20, in particular to the respective stator teeth 31 or tooth bodies 23A, by a material bond and / or adhesive bond.

[0166] Preferably, the coil carrier 30 is fixed to the stator core 20 in the axial and / or circumferential direction by the winding sections 31, or is positively connected to it. In particular, the winding sections 31 bear against the stator teeth 23 or tooth body 23A along the stator teeth, thus preventing any movement of the coil carrier 30 relative to the stator core 20 in the axial and / or circumferential direction.

[0167] The tooth heads 23B or their tooth head surfaces 23C preferably project radially from the respective winding sections 31 or the through-openings 36. In particular, the tooth heads 23B and / or tooth head surfaces 23C are free or uncovered.

[0168] The coil carrier 30 and / or the winding sections 31 preferably have several winding projections 31A, 31B, which extend particularly in the axial direction. The winding projections 31A, 31B preferably serve as radial limits for the coils 10.

[0169] In the illustrated example, each winding section 31 has a first winding projection 31A and a second winding projection 31B. The first winding projection 31A preferably extends at the free end of the winding section 31 and / or the second winding projection 31B at the opposite end or between the winding section 31 and the respective collar 34A, 34B. Preferably, each winding section 31 has a first and a second winding projection 31A, 31B on each axial side, thus preferably a total of four winding projections 31A, 31B.

[0170] The coils 10 are preferably each held between two winding projections 31A, 31B (radially).

[0171] The coils 10 are preferably each formed by coil wire 11 which is wound around the respective winding sections 31.

[0172] The stator teeth 23 preferably extend through the coils 10 or are (indirectly) wound around the coils 10, with the coil carrier 30 or its winding sections 31 being located between the stator teeth 23 and the coils 10.

[0173] Each coil 10 preferably has at least 140, in particular at least 150 turns and / or at most 200, in particular at most 190 turns, and most preferably about 170 turns. Accordingly, each stator tooth 23 or tooth body 23A is preferably wound at least 140 times, in particular at least 150 times and / or at most 200 times, in particular at most 190 times, and most preferably about 170 times.

[0174] The coil wire 11, from which the coils 10 are formed or wound, is preferably made of copper.

[0175] The coil wire 11 preferably has a bare wire diameter of at least 0.2 mm and / or at most 0.6 mm, particularly preferably of about 0.4 mm.

[0176] The coil wire 11 preferably has a total weight of more than 100 g, in particular more than 150 g, and / or less than 300 g, in particular less than 250 g, particularly preferably of about 200 g.

[0177] In the illustrations according to the first and second embodiments, preferably four coils 10 are wound from the same coil wire 11, in particular two adjacent coils 10 and their respective opposite coils 10. The twelve coils 10 of the illustration can thus preferably be divided into three groups, which can in particular be controlled separately. It is preferably a three-phase electric motor 1. However, other solutions are generally possible.

[0178] The following section describes the brackets 32 and 33, in particular with regard to Figs. 6 to 8, described in more detail. The statements and explanations regarding the connection bracket 32 ​​apply preferably to the first and the second embodiment.

[0179] Fig. 6 Figure 2 shows the stator 2 according to the second embodiment in a schematic, perspective view. Compared to the perspective view according to Figure 2, the following applies: Fig. 3 is stator 2 in Fig. 6 rotated 45° about the axis of rotation A and shown from the other axial end face. In particular, it shows Fig. 3 a perspective view of one axial end face of the stator core 40, against which the second collar 34B rests, and the Fig. 6 the other axial end face of the stator core 40, to which the first collar 34A rests.

[0180] As already mentioned at the outset, the coil carrier 30 preferably has one or more mountings, in the second embodiment preferably a connection mounting 32 and a sensor mounting 33. In general, however, other and / or more than two mountings are also conceivable.

[0181] Generally, the mounting bracket(s), in particular the connection bracket 32 ​​and / or sensor mounting bracket 33, is / are arranged radially on the outside of the stator core 40 or on the outer surface 22A of the stator core 20 or stator yoke 22, or on a side of the stator core 20 facing away from the rotor 3, the opening 21, or the coils 10. It is particularly preferred that the mounting bracket(s), in particular the connection bracket 32 ​​and / or sensor mounting bracket 33, is / are arranged on one of the flat / planar side surfaces of the outer surface 22A. Several mounting brackets can also be arranged on the same side surface.

[0182] The holder(s), in particular the connection holder 32 and / or sensor holder 33, is / are preferably formed integrally with the coil carrier 30 or form (each) a part or section of the integral coil carrier 30. In principle, however, the holder(s) constitute an independent aspect of the invention and can therefore also be manufactured separately and connected to the coil carrier 30.

[0183] Preferably the mounting bracket(s), in particular the connection bracket 32 ​​and / or the sensor bracket 33, is / are injection-molded onto the stator core 40.

[0184] The mounting bracket(s), in particular the connection bracket 32 ​​and / or the sensor mounting bracket 33, preferably rests (directly) on the stator core 20, in particular the stator yoke 22 and / or the outer surface 22A, or is / are injection-molded onto it. Particularly preferably, the mounting bracket(s), in particular the connection bracket 32 ​​and / or the sensor mounting bracket 33, is / are bonded to the stator core 20, in particular the stator yoke 22 and / or the outer surface 22A, by a material bond and / or adhesive bond.

[0185] Preferably the holder(s), in particular the connection holder 32 and / or the sensor holder 33, is / are integrally formed on the collar 34A and / or 34B or extends / extends radially outwards from the collar 34A and / or 34B.

[0186] The support(s) have at least one radial section 32A, 33A and one axial section 32B, 33B.

[0187] The radial section 32A, 33A extends radially outwards along one of the axial end faces of the stator core 20 or stator yoke 22, respectively, in the direction of the outer surface 22A, in particular from the collar 34A and / or 34B.

[0188] The respective holder can have only one radial section 32A, 33A on one of the end faces, or one radial section on each end face. In the illustrated example, the connection holder 32 preferably has two radial sections 32A, one radial section 32A extending from the first collar 34A and another radial section 32A extending from the second collar 34B. In the illustrated example, the sensor holder 33 preferably has only one radial section 33A extending from the first collar 34A. However, other solutions are also possible.

[0189] The respective radial section 32A, 33A preferably lies (directly) against the stator core 20, in particular the stator yoke 22, or is injection-molded onto it. Particularly preferably, the respective radial section 32A, 33A is bonded to the stator core 20, in particular the stator yoke 22, by a material bond and / or adhesive bond.

[0190] The axial section 32B, 33B extends along the outer surface 22A of the stator core 20 or stator yoke 22.

[0191] The axial section 32B, 33B is preferably located (directly) on the stator core 20 or 33B.

[0192] Stator yoke 22, in particular the outer surface 22A, is injection-molded onto or attached to the stator core 20 or stator yoke 22, in particular the outer surface 22A. The axial section 32B, 33B is particularly preferably bonded to the stator core 20 or stator yoke 22, in particular the outer surface 22A, by a material bond and / or adhesive bond.

[0193] The axial section 32B, 33B and the radial section(s) 32A, 33A preferably extend at least substantially perpendicular to each other.

[0194] The sensor holder 33 surrounds the stator core 20 or the stator yoke 22, with its axial section 32B, 33B and radial section(s) 32A, 33A.

[0195] The mounting(s), in particular the connection mounting 32 and / or sensor mounting 33, preferably extends over the entire height or axial extent of the stator core 20 or stator yoke 22 or outer surface 22A, in particular with the axial section 32B, 33B.

[0196] Depending on the mounting, the width of the mounting, i.e., its extent in the circumferential or tangential direction, or (directly / adhering to) the outer surface 22A in the direction perpendicular to the axial direction, can vary. In the illustrated example, the connection mounting 32, in particular its axial section 32B, extends less far (directly or adhering to) the outer surface 22A than the sensor mounting 33, in particular its axial section 33B, preferably by about 5 mm less. The same preferably applies to the extent of the mountings 32, 33 along the axial end face of the sensor core 20 (in the tangential direction), in particular the radial sections 32A, 33A.

[0197] Preferably, the corresponding width / extent of the connection bracket 32, in particular of the radial and / or axial section 32A, 32B, is more than 20 mm and / or less than 30 mm, and / or the corresponding width / extent of the sensor bracket 33, in particular of the radial and / or axial section 33A, 33B, is more than 25 mm and / or less than 35 mm. However, the connection bracket 32 ​​may have a wider, projecting section 32C that is not in direct contact with the sensor core 20, as described in more detail below.

[0198] The contact area of ​​the connection bracket 32, in particular of the axial section 32A, against the outer surface 22A is preferably more than 400 mm² and / or less than 600 mm². The contact area of ​​the sensor bracket 33, in particular of the axial section 33A, against the outer surface 22A is preferably more than 500 mm² and / or less than 700 mm². It is particularly preferred that the contact area of ​​the sensor bracket 33 is at least 100 mm² larger than the contact area of ​​the connection bracket 32.

[0199] The connection device 40 and the sensor device 50 are preferably arranged offset by 90° on the sensor core 20 and the outer surface 22A, respectively. However, other solutions are also conceivable; for example, the connection device 40 and the sensor device 50 could be positioned opposite each other.

[0200] The following describes the connection bracket 32 ​​and the connection device 40 it holds, in particular with reference to the Figure 6 and 7, explained in more detail. The explanations preferably apply to both the first and the second embodiment.

[0201] The connection bracket 32 ​​holds / carries the connection device 40 or is designed to do so.

[0202] Preferably, the connection bracket 32, in particular in addition to the radial section 32A and axial section 32B, has a protruding section 32C which holds or is designed to hold the connection device 40.

[0203] Section 32C preferably extends radially outwards from radial section 32A and / or axial section 32B. In particular, section 32C is spaced away from or not directly connected to the stator core 20.

[0204] Section 32C is preferably designed in a balcony-like manner.

[0205] The width or extent in the tangential direction of section 32C is preferably larger than the corresponding width / extent of the radial section 32A and / or axial section 32B, in particular by more than 10 mm or 15 mm and / or less than 25 mm.

[0206] In general, solutions without section 32C are also possible, in which the connecting device 40 is preferably held directly by the radial and / or axial section 32A, 32B.

[0207] Fig. 7 The diagram schematically shows the connection device 40 in perspective. The representation corresponds to an enlargement of the Fig. 6 , whereby the connector bracket 32 ​​is not shown.

[0208] The connection device 40 preferably has an electrical connection or electrical connection contacts 41.

[0209] The coils 10 can preferably be supplied with current and / or control signals via the electrical connection contacts 41, in particular via the ends of the coil wires 11.

[0210] The electrical connection contacts 41 are preferably formed by or comprise one or more terminals 42, in particular insulation displacement connectors. The terminal(s) 42 preferably each have a clamping slot 42A for conductive connection to a coil wire 11 or its end.

[0211] The terminals 42 are preferably spaced apart from each other or held at a corresponding distance from the connection bracket 32, so that they are electrically isolated from each other.

[0212] A different voltage can preferably be applied to each contact 41 or each terminal 42, in particular so that the different coil wires 11 and associated coils 10 can be controlled differently.

[0213] The number of contacts 41 or terminals 42 can vary depending on the number of different coil wires 11 and / or depending on the wiring of the coil wires 11 or the coils 10. In the illustrated example, the connection device 40 preferably has three electrical connection contacts 41 or terminals 42.

[0214] Preferably, the connection device 40 has a star point 43 for the connection of the coil wires 11 or the coils 10. In particular, the coils 10 are connected to each other in a star connection. This preferably means that the different coil wires 11 of the different (groups of) coils 10 are connected to each other, especially at the ends of the coil wires 11.

[0215] Preferably, each coil wire 11 forms an electrical connection contact 41 with one end or is electrically connected to a corresponding terminal 42 and is connected to the star point 43 with its other end.

[0216] In the illustration example, preferably three (ends of the) coil wires 11 are connected together to form a star point.

[0217] The connection device 40 preferably has, in particular in addition to the terminal(s) 42 for the connection contacts 41, a terminal 44, in particular an insulation displacement connector, for forming the star point 43.

[0218] The terminal 44 is preferably designed to electrically connect the (ends of the) coil wires 11 to each other or to form the star point 43.

[0219] Preferably, the terminal 44 has one or more clamping slots 44A for conductive connection with one or more coil wires 11. For example, the terminal 44 could have one clamping slot 44A that electrically connects all, and in particular three, coil wires 11 to each other. Alternatively, the terminal 44 can have several clamping slots 44A. In In this case, terminal 44 preferably has a contact bridge 44B which electrically connects the terminal slots 44A and thus the (ends of the) coil wires 11 clamped there.

[0220] In the illustrated example, terminal 44 has two clamping slots 44A, which are connected to each other by a contact bridge 44B. Since the electric motor 1 or stator 2 has three different coil wires 11 or three ends of the coil wires 11, which are to be connected to a star point 43, two coil wires 11 are clamped in the same clamping slot 44A. The illustrated terminal 44 is preferred because it is a standard terminal. However, it is also possible to use a terminal 44 with three clamping slots 44A or with only one clamping slot 44A.

[0221] As an alternative to terminal 44, the star point 43 can also be formed by soldering or welding the corresponding ends of the coil wires 11 together or by otherwise electrically connecting them together.

[0222] Preferably, the connection holder 32, in particular the preceding section 32C, has a contact section 32D that holds / carries the electrical connection contacts 41 or terminals 42, and / or a star point section 32E that holds / carries the star point 43 or terminal 43.

[0223] The connection contacts 41 and / or the star point 43 are held or arranged radially outside on the stator 2 or stator core 20, in particular on the side of the stator 2 or stator core 20 facing away from the coils 10, by means of the connection bracket 32.

[0224] The connection device 40, or the connection contacts 41 and / or the star point 43, or the terminal(s) 42 and / or 44, are preferably automatically mountable or already mounted on the connection bracket 32. Particularly preferably, the connection contacts 41 / terminals 42 and the star point 43 / terminal 44 can be automatically mounted on the connection bracket 32 ​​using the same device.

[0225] Generally, it is also possible to provide two mounting brackets, one holding the connection contacts 41 and the other holding the star point 43. Furthermore, it is also possible to provide only the connection contacts 41 on the mounting bracket 32, for example, if no star connection is planned.

[0226] The connection bracket 32 ​​can have one or more guide projections 32F around which the coil wire 11 can be wound or by means of which the coil wire 11 can be guided, in particular to the connection device 40. The guide projections 32F can, for example, extend axially from the radial section 32A.

[0227] The connection bracket 32 ​​can have one or more ribs 32G, preferably to reinforce the connection bracket 32, in particular the preceding section 32C. Preferably, the ribs 32G prevent the connection bracket 32, in particular the preceding section 32C, from bending elastically.

[0228] The sensor holder 33 holds / carries the sensor device 50 or is designed to do so.

[0229] The sensor device 50 comprises a sensor plate 51, a sensor 52, an electrical connection 53 and / or a sensor connection 54.

[0230] The electrical connection 53 is preferably a connection or contact via which the sensor device 50 can be supplied with power and / or via which electrical signals from the sensor device 50 or the sensor 52 can be tapped or forwarded to an evaluation unit (not shown).

[0231] The sensor connection 54 is preferably a connection or contact via which the sensor 52 or further sensor 55 can be connected to the sensor device 50, in particular the sensor plate 51, in particular by means of a sensor cable 56. This will be explained in more detail later in connection with Fig. 8 explained in more detail.

[0232] The sensor plate 51 is preferably a printed circuit board or circuit board and / or designed to process and / or transmit electrical signals. However, it is also possible that the sensor plate 51 is simply a (non-conductive) mounting plate that carries a sensor 52 and / or a connection 53, 54 for a sensor.

[0233] Preferably the sensor plate 51 carries or forms the sensor 52, electrical connection 53 and / or sensor connection 54.

[0234] The sensor device 50 or parts thereof, in particular the sensor plate 51, the sensor 52, the electrical connection 53 and / or the sensor connection 54, is / are preferably held by or attached to the sensor holder 33.

[0235] According to the invention, the sensor 52 and / or the sensor plate 51 is attached to the axial section 33B of the sensor holder 33.

[0236] The sensor holder 33 preferably has one or more fastening sections 33D, by means of which the sensor device 50, in particular the sensor 52 and / or the sensor plate 51, is attached or can be attached to the sensor holder 33, preferably in a form-fitting and / or material-fitting manner.

[0237] In the illustration example, the fastening section 33D is designed as a pin or stud which is hot-stitched to fasten the sensor device 50 to it, in particular to the sensor plate 51. Fig. 4shows the fastening section 33D as an example before hot riveting, while the fastening section 33D in Fig. 6 shown after hot riveting. Preferably, the sensor holder 33 has at least two such fastening sections 33D.

[0238] However, other solutions are also conceivable, for example screwing or gluing the sensor device 50 or sensor plate 51 to the sensor holder 33.

[0239] Preferably, the sensor holder 33 includes a cable holder 33C designed to hold, secure, and / or guide one or more cables 56 of the sensor device 50. The cable(s) 56 may, in particular, be a cable that is or can be connected to the electrical connection 53 and / or the sensor connection 54.

[0240] The cable holder 33C is preferably formed on the axial section 33B of the sensor holder 33 and / or projects radially outwards from the axial section 33B or the sensor core 20 or the outer surface 22.

[0241] Preferably, the cable holder 33C is designed in a hook shape or as a hook.

[0242] The cable holder 33C can be partially elastic, in particular so that the cable(s) 56 can be clipped into the cable holder 33C.

[0243] The sensor device 50 or the sensor 52 is preferably designed to measure parameters of the coils 10 and / or the rotor 3. Accordingly, the sensor 52 is preferably arranged in the area of ​​the coils 10 and / or the rotor 3.

[0244] In the illustrated example, the sensor 52 is configured to detect measured values ​​of the coils 10. Accordingly, the sensor 52 extends over the coils 10 or is arranged axially above them. In particular, the sensor assembly 50, sensor plate 51, or sensor 52 has an arm or arm-like section that extends (from the sensor mount 33) in a radial direction towards the axis of rotation A and / or projects over one of the coils 10. In the case of measuring rotor properties, the sensor assembly 50 or the arm preferably extends over the coils 10 and over the rotor 3.

[0245] In the illustrated example, the sensor 52 is preferably designed to measure the temperature of the electric motor 1, particularly in the area of ​​the coils 10, or as a temperature sensor 52. The sensor 52 is particularly preferably an NTC temperature sensor. Preferably, the sensor 52 measures the air temperature in the area where it is located.

[0246] Alternatively, the sensor 52 can be configured to detect the rotation angle of the rotor 3 or as a rotation angle sensor. This can be implemented, for example, by a light barrier and / or by a Hall sensor or a Hall switch element, which preferably determines the rotor polarity, from which the rotational speed of the rotor 3 can be calculated.

[0247] The sensor 52 can also be designed as a Hall sensor for determining other, in particular magnetic, measured quantities of the electric motor 1.

[0248] In general, sensor 52 is not limited to a temperature sensor, Hall sensor and / or rotation angle sensor, but can also be any other type of sensor.

[0249] It is also possible that the sensor assembly 50 has several sensors 52 and / or that several sensors 52 are held by or attached to the sensor holder 33. Alternatively or additionally, the coil carrier 30 can also have several sensor holders 33, with each sensor holder 33 holding / carrying one or more sensors.

[0250] In general, it is also possible that only one bracket is provided which holds / supports both the connection device 40 and the sensor device 50.

[0251] As mentioned previously, the sensor of the sensor device 50 does not need to be directly attached to the sensor holder 33. It is also possible that the sensor holder 33 merely holds / supports the sensor connection 54, to which a sensor is connected or can be connected. This is shown schematically in Fig. 8 shown.

[0252] Fig. 8Figure 1 shows a schematic top view of the electric motor 1. The electric motor 1 is shown with a bearing bridge 60, which is designed in particular for supporting the shaft 7.

[0253] The bearing bridge 60 is preferably attached to the stator 2 and / or the stator 2 incorporates the bearing bridge 60. In particular, the bearing bridge 60 is attached to the stator core 20 by means of fastening elements 70, especially screws, and in particular by bolting. Preferably, the screw holes 24A of the stator core 20 or of the projections 24 are used for fastening the bearing bridge 60.

[0254] The bearing bridge 60 preferably has several ribs 61, in particular reinforcing or stiffening ribs. Furthermore, the bearing bridge 60 can also have recesses, in particular between the ribs 61 (not shown), especially to ensure ventilation of the electric motor 1.

[0255] The electric motor 1, in particular the stator 2, preferably has two bearing bridges 60, wherein the second bearing bridge 60 is located on the opposite side, in Fig. 8 is attached to the non-visible, axial side of the stator core 20.

[0256] In the illustration example according to Fig. 8 The sensor device 50 preferably has a sensor 55 arranged in the area of ​​the shaft 7 or centrally on the electric motor 1 or stator 2.

[0257] The sensor 55 is preferably configured as a Hall sensor and / or angle sensor, in particular for detecting the rotation of the rotor 3 or the shaft 7. The sensor 55, especially when configured as a Hall sensor, can also be used for measuring other quantities.

[0258] The sensor 55 is preferably attached to or held by the bearing bridge 60.

[0259] The sensor device 50 preferably has a sensor cable 56 for connecting the sensor 55, in particular for transmitting electrical signals from the sensor 55. Preferably, the sensor cable 56 connects the sensor 55 to the sensor terminal 54.

[0260] The sensor cable 56 is preferably held or guided by the cable holder 33C. In particular, the cable holder 33C guides the sensor cable 56 to the sensor connection 54.

[0261] In In this sense, a sensor holder 33 for a sensor device 50 can preferably also be understood as a holder that does not directly carry / hold a sensor, but only parts of it, such as a circuit board 51, a connection 53, 54 and / or a sensor cable 56.

[0262] The sensor device 50 preferably comprises both the sensor 52, in particular a temperature sensor, and the sensor 55, in particular a Hall sensor. The signals of the two sensors 52, 55 are preferably combined on the circuit board 51 and / or via the sensor connection 54.

[0263] Fig. 9 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.

[0264] The food processor 100 preferably has a base station 110 and / or a container 120 for receiving food.

[0265] 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.

[0266] Fig. 9 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.

[0267] 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.

[0268] 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.

[0269] Preferably, the stirring blades have cutting edges or are designed as cutting edges to chop food.

[0270] 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.

[0271] 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 7 - optionally via a shaft attachment - and / or - in the connection position - engages positively in the base of the container 120 from below.

[0272] 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. 9 hinted at.

[0273] Preferably the central axis is a longitudinal or symmetry axis of the preferably elongated, cylindrical and / or at least substantially rotationally symmetric vessel 120.

[0274] 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.

[0275] Depending on the rotational speed of the stirrer 121 or electric motor 1, the food processor 100 is preferably designed for both stirring (at low speeds) and chopping (at high speeds) of ingredients. Particularly preferred is slow stirring, for example at 10 rpm, and / or very fine or defined chopping, for example at 10,000 rpm.

[0276] Individual aspects, features and / or process steps of the present invention can be implemented independently, but also in any combination and / or sequence. Reference symbol list:

[0277] 1 electric motor 2stator 3Rotor 4Permanent magnet 5Rotor core 6Fan 7Shaft 10 coils 11 coil wire 20 Stator core 21 Opening 22 Stator yoke 22A Outer side 22B Inner side 23 Stator tooth 23A Tooth body 23B Tooth tip 23C Tooth tip surface 24 Projection 24A Screw hole 25 Winding space 26 Slot 27 Stator lamination 27A Stamping area 30 Coil carrier 31 Winding section 32 Connection bracket 32 ​​A Radial section 32 B Axial section 32 C Protruding section 32 D Contact section 32 E Star point section 32 F Guide projection 32 G Rib 33 Sensor bracket 33 A Radial section 33 B Axial section 33 C Cable holder 33 D Mounting section 34 A First collar 34 B Second collar 35 Connecting wall 36 Through opening 40 Connection device 41 Electrical connection contacts 42 Terminal (electrical connection) 42A Terminal slot 43 Star point 44 Terminal (star point) 44A Terminal slot 44B Contact bridge 50 Sensor assembly 51 Sensor plate 52 Sensor (temperature sensor) 53 Electrical connection 54 Sensor connection 55 Sensor (Hall sensor) 56 Sensor cable 60 Bearing bridge 61 Rib 70 Fastening element 100 Food processor 110 Base station 111 Storage 112 Power supply 120 Bowl 121 Stirrer Rotation axis

Claims

1. Electric motor (1), in particular for a food processor (100), having a rotor (3) and a stator (2), wherein the rotor (3) is rotatable about an axis of rotation (A) relative to the stator (2), wherein the stator (2) has a stator core (20), a plurality of coils (10) and a coil carrier (30) for the coils (10), and wherein the coil carrier (30) is produced in one piece by injection-moulding onto the stator core (20), characterized in that the coil carrier (30) has at least one holder (33) which is arranged radially on the outside of the stator core (20) and holds a sensor device (50), wherein the holder (33) has a radial portion (33A) and an axial portion (33B), and engages around the stator core (20) with its axial portion (33B) and radial portion (33A), wherein the radial portion (33B) extends radially outwards along one of the axial end sides of the stator core (20), and wherein the axial portion (33B) extends along an outer side (22A) of the stator core (20), wherein the sensor device (52) has a sensor (52) which is designed to detect measured variables of the coils (10), and wherein the sensor (52) is held by the holder (33) and is arranged axially above the coils (10).

2. Electric motor according to claim 1, wherein the sensor device (50) has a temperature sensor (52), in particular an NTC temperature sensor, and / or a Hall sensor (55), in particular for detecting the angle of rotation.

3. Electric motor according to either of the preceding claims, wherein the sensor device (50) or a sensor plate (51) of the sensor device (50) is heat-staked with the holder (33).

4. Electric motor according to any of the preceding claims, wherein the holder (33) forms a, in particular hook-shaped, cable holder (33C) for a cable of the sensor device (50).

5. Electric motor according to any of the preceding claims, wherein the coil carrier (30) is cohesively and / or adhesively connected to the stator core (20).

6. Electric motor according to any of the preceding claims, wherein the coil carrier (30) engages around the stator core (20) and / or forms a form fit with the stator core (20) in the axial direction, in the radial direction and in the circumferential direction.

7. Electric motor according to any of the preceding claims, wherein the coil carrier (30) has a plurality of, in particular precisely two, holders (32, 33) which are spaced apart from one another and are each arranged radially on the outside of the stator core (20).

8. Electric motor according to claim 7, wherein one of the holders (32, 33) is designed as a connection holder (32) and holds a connection device (40), and wherein another of the holders (32, 33) is designed as a sensor holder (33) and holds the sensor device (50).

9. Electric motor according to any of claims 1 to 6, wherein the holder (33) holds a connection device (40).

10. Electric motor according to claim 8 or 9, wherein the connection device (40) has electrical connection contacts (41) for the coils (10) and / or a star point (43) of an interconnection of the coils (10), in particular wherein the connection device (40) has a terminal (44) which forms the star point (43).

11. Electric motor according to any of the preceding claims, wherein the stator (2) has precisely twelve coils (10) and / or the stator core (20) has precisely twelve stator teeth (23) for the coils (10), and / or wherein the stator core (20) has an internal diameter of at least 70 mm and / or at most 85 mm, and / or wherein the stator core (20) has an external diameter of at least 120 mm and / or at most 165 mm, and / or wherein the stator core (20) has a height of at least 15 mm and / or at most 25 mm, and / or wherein the stator core (20) has a yoke thickness of at least 6 mm and / or at most 12 mm, and / or wherein the stator core (20) has a plurality of, in particular precisely twelve, stator teeth (23), wherein each stator tooth (23) has a radial extent of at least 10 mm and / or at most 22 mm and / or an extent in the circumferential direction of at least 10 mm and / or at most 20 mm, and / or wherein the stator core (20) has a plurality of, in particular precisely twelve, stator teeth (23), wherein a slot (26) which has a width of at least 3 mm and / or at most 6 mm is formed in each case between two stator teeth (23), and / or wherein the stator core (20) is formed by at least 35 and / or at most 45 stator laminations (27) which are laid one on top of the other, and / or wherein the coils (10) each have at least 150 turns and / or at most 190 turns and / or a bare wire diameter of at least 0.2 mm and / or at most 0.6 mm, and / or wherein the coil carrier (30) is produced from polyamide, in particular of the PA6 type.

12. Food processor (100) having an electric motor (1) according to any of the preceding claims.

13. Method for producing an electric motor (1) according to any of claims 1 to 11 having a stator (2) and a rotor (3) which is rotatable about an axis of rotation (A) relative to the stator (2), wherein a coil carrier (30) of the stator (2) is produced by injection-moulding onto a stator core (20), characterized in that the coil carrier (30) is produced with at least one holder (33) which is arranged radially on the outside of the stator core (20) and is designed to hold a sensor device (50), wherein the holder (33) has a radial portion (33A) and an axial portion (33B), and engages around the stator core (20) with its axial portion (33B) and radial portion (33A), wherein the radial portion (33B) extends radially outwards along one of the axial end sides of the stator core (20), and wherein the axial portion (33B) extends along an outer side (22A) of the stator core (20), wherein the sensor device (52) has a sensor (52) which is designed to detect measured variables of the coils (10), and wherein the sensor (52) is held by the holder (33) and is arranged axially above the coils (10).

14. Method according to claim 13, wherein the coil carrier (30) is produced such that it engages around the stator core (20) and / or is cohesively and / or adhesively connected to the stator core (20) and / or forms a form fit with the stator core (20) in the axial direction, in the radial direction and in the circumferential direction.

15. Method according to claim 13 or 14, wherein the sensor device (50) or a sensor plate (51) of the sensor device (50) is heat-staked with the holder (33).