Electric drive motors, wet rotor pumps and household appliances

Abstract

The invention relates to an electric drive motor (10) having a stator (1) with at least one electrically controllable stator winding (1a) and a rotor which is supported in a rotationally drivable manner in the field of the at least one controllable stator winding (1a) while retaining an annular gap (9), the rotor having a motor shaft (3c) and a magnet carrier (3a) which is arranged coaxially with the motor shaft (3c) and has at least one permanent magnet (12) which is arranged on the outer circumference of the magnet carrier (3a), wherein the motor shaft (3c) and the magnet carrier (3a) are integrally formed, wherein the motor shaft (3c) and the magnet carrier (3a) are produced together from a single raw sheet metal by forming to form an integral rotor molded body. The invention also relates to a wet rotor pump (6) and a household appliance having such an electric drive motor (10).

Description

Technical Field

[0001] The invention relates to an electric drive motor having a stator with at least one electrically controllable stator winding and a rotor which is supported in the field of the at least one controllable stator winding in a rotationally drivable manner while retaining an annular gap, the rotor having a motor shaft and a magnet carrier which is arranged coaxially with the motor shaft and has at least one permanent magnet which is arranged on the outer circumference of the magnet carrier. The invention also relates to an associated wet rotor pump and a household appliance having such an electric drive motor. Background Art

[0002] DE 10 2014 202 572 A1 describes an electric drive motor for a pump, which has an electrically controllable stator winding and a rotor supported in a rotatable manner in the field of the stator winding while retaining an annular gap, the rotor having a motor shaft, a magnet carrier mounted on the motor shaft, and a plurality of permanent magnets distributed around at least one side of the magnet carrier, the permanent magnets each having at least one outer surface and being fixed to the magnet carrier by means of a plastic body manufactured by extrusion encapsulation of the magnet carrier, wherein the permanent magnets are held by the plastic body on their outer surfaces facing the annular gap in a form-fitting and / or force-fitting manner such that at least a portion of these outer surfaces are exposed.

[0003] DE 10 2016 219 974 B3 describes an electric drive motor having a stator with pole shoes and at least one electrically controllable stator winding, and a permanent magnet rotor supported in the field of the stator winding in a rotatable manner while retaining an annular gap, the permanent magnet rotor having a motor shaft and a magnet carrier mounted on the motor shaft and manufactured as an injection molded part, on which a plurality of individual permanent magnets are arranged distributed in a peripheral area, wherein the permanent magnet rotor has a clamping device that is constructed to press the plurality of permanent magnets outward in a radial direction toward the inner wall of a cavity of an injection mold of the magnet carrier during injection molding of the magnet carrier. Summary of the invention

[0004] The object of the present invention is to provide an electric drive motor having a rotor with at least one permanent magnet, the structural complexity of which and its production costs are optimized so that it can be produced cost-effectively and simply.

[0005] According to the invention, this object is achieved by an electric drive motor having a stator with at least one electrically controllable stator winding and a rotor which is supported in the field of the at least one controllable stator winding in a manner that allows for rotational driving while retaining an annular gap, the rotor having a motor shaft and a magnet carrier which is arranged coaxially with the motor shaft and has at least one permanent magnet which is arranged on the outer circumference of the magnet carrier, wherein the motor shaft and the magnet carrier are designed as one piece, wherein the motor shaft and the magnet carrier are produced together from a single raw sheet metal by forming to form an integral rotor molded body.

[0006] The at least one permanent magnet can be configured as a permanent magnet. The permanent magnet can have a hard magnetic material, by which a permanent magnetic field can be provided. The at least one permanent magnet can be configured as a one-piece or multi-component structure and can in particular be made of hard magnetic ferrite. Usually, in the case of a plurality of permanent magnets, these permanent magnets are preferably all configured identically. The plurality of permanent magnets can each have a ring sector shape.

[0007] The field is a region formed as a magnetic field, which is generated by a magnetic material and / or by an electric current. The field can act magnetically on at least one permanent magnet of the rotatably mounted rotor when it is generated by the stator. By the magnetic effect of the field on the at least one permanent magnet of the rotatably mounted rotor, a controlled circular motion of the rotor or of a motor shaft of the rotatably mounted rotor can be generated.

[0008] The magnet carrier of the electric drive motor can have one or more permanent magnets arranged uniformly distributed in the peripheral range, and the permanent magnets are fixed to the magnet carrier. The permanent magnets can be arranged uniformly distributed in the peripheral range of the magnet carrier. In this regard, the permanent magnets arranged uniformly distributed in the peripheral range of the magnet carrier can complement each other to form a surrounding, multi-piece magnetic ring except for slight gaps.

[0009] The annular gap defines the region of the electric drive motor that forms the spacing of the stator relative to the rotatably mounted rotor. This region should preferably have a small spacing of the stator relative to the rotatably mounted rotor so that the field of the stator can directly influence the permanent magnets of the magnet carrier of the rotatably mounted rotor.

[0010] The stator represents a non-movable part of the electric drive motor, which has a predetermined number of pole shoes, i.e., stator poles. The stator can have at least two or more stator poles, which have a position on the stator that cannot be changed during use. The stator poles can have electrically controllable stator windings, so that the rotor, which is supported in a rotatable manner, can be set into a rotational and circular motion.

[0011] The rotatably mounted rotor represents a movable part of the electric drive motor, which has a magnet carrier with at least one permanent magnet. The rotatably mounted rotor can have a one-sided bearing arrangement that allows a rotational movement to be performed in the annular gap. The bearing arrangement of the rotatably mounted rotor can have, for example, a single radial plain bearing that can be designed to support the rotatably mounted rotor both in the radial direction and, in particular, also in the axial direction.

[0012] Forming refers to a processing method, which includes in particular the forming techniques of rolling, open forging, die forging, punching, extrusion, deep drawing and bending. In this case, the shape of the raw material is adjusted by the different processing methods, which is based on the degree of plasticity. In particular, the deep drawing processing method can be used for forming.

[0013] The starting material has the possibility of plastic deformation without losing the material connection and additionally has the ability to conduct magnetic energy. Thus, the one-piece rotor molded body can be molded, in particular deep-drawn, from a starting material, in particular a one-piece, flat starting material, and the molded one-piece rotor molded body can form the motor shaft and the magnet carrier.

[0014] The one-piece rotor molded body is rotatably supported by means of a bearing structure, so that a motor shaft section supports the motor shaft section on a middle section arranged axially between a first end section and a second end section of the motor shaft section. This feature of the one-piece rotor molded body means in particular that the bearing structure arranged in the middle section of the motor shaft section can be the only bearing structure that rotatably supports the motor shaft section. The motor shaft section can therefore be rotatably guided and rotatably supported, in particular relative to the motor housing, only by means of this single bearing structure that supports it on the middle section of the motor shaft section. The one-piece rotor molded body can in this respect be supported only on one side.

[0015] By means of the forming processing method, the integrated rotor shaped body can be manufactured from an original sheet material, and the rotor shaped body integrally forms the motor shaft and the magnet bearing part. By means of the integral construction of the motor shaft and the magnet bearing part, wherein the motor shaft and the magnet bearing part are manufactured together from a single original sheet material by forming into an integrated rotor shaped body, the complexity of the installation of the electric drive device can be reduced and / or the processing cost can be optimized.

[0016] The one-piece rotor molded body can have a motor shaft section formed by deep drawing and a magnet carrier section formed by deep drawing.

[0017] The deep-drawing processing method describes the modification of a preferably flat original sheet material, which within the scope of the present invention can be referred to as a substrate. The substrate can be formed on one side or on both sides by tension and / or pressure. The deep-drawing process can be achieved here by a tool, by an acting medium, such as water and / or by acting energy, such as magnetic energy, in particular by a tool. By means of the deep-drawing process, the substrate, which can also be understood as a semi-finished product, can have a defined shape, which can be predetermined in particular by the tool. After the actual deep-drawing process, for example, curling, tracheal gills, openings and / or perforations can be added to the semi-finished product formed by punching or cutting.

[0018] The motor shaft section forms a motor shaft which is integrally connected to a magnet carrier section forming a magnet carrier. The motor shaft section can be used for force transmission. The magnet carrier section can be used to receive permanent magnets.

[0019] The one-piece rotor molded body can have a connecting section by deep drawing, which connects the motor shaft section to the magnet carrier section in one piece.

[0020] The connecting section represents the region between the motor shaft section and the magnet carrier section, which forms a one-piece rotor molded body due to the processing method. By carrying out the production process of the one-piece rotor molded body according to the invention, a rotatably mounted rotor can be provided, which, due to its one-piece design consisting of the magnet carrier section, the motor shaft section and the connecting section, makes the installation of the rotatably mounted rotor consisting of separate components of the rotatably mounted rotor superfluous.

[0021] The motor shaft section can be connected to the magnet carrier section at an axial end of the one-piece rotor molded body and the magnet carrier section can extend starting from this axial end at least substantially coaxially to the axis of the motor shaft section.

[0022] The motor shaft section is configured with an open first end, to which a component to be driven, such as, for example, a pump wheel, can be fastened and / or a bearing can be arranged on the open first end. The motor shaft section is also configured with a second end opposite the open first end, which can be integrally transformed into a connecting section. The connecting section is integrally connected to a magnet carrier section, which extends coaxially with the motor shaft section in the direction of the first end of the motor shaft section. The motor shaft section, the connecting section and the magnet carrier section form an integral rotor shaped body.

[0023] The electric drive motor can have a separately manufactured magnetically conductive additional ring, which can be fixed to the surface of the magnet carrier section and on which at least one permanent magnet can be arranged. The use of a separately manufactured magnetically conductive additional ring can be particularly suitable if, for example, the permanent magnets are magnetized in such a way that a yoke is required as a return iron. As an alternative or in addition, the use of a separately manufactured magnetically conductive additional ring can be particularly suitable if the formed, in particular deep-drawn, rotor shaped body is made of a non-ferrous metal, such as, for example, aluminum or an alloy thereof.

[0024] The magnetically conductive additional ring can be designed in one piece or can be composed of a plurality of sub-parts, in particular bent from a flat material. The magnetically conductive additional ring can in particular have the shape of a straight hollow cylinder.

[0025] Within the scope of the present invention, it is possible to use different embodiments of the magnetic additional ring. In a first embodiment, the magnetically conductive additional ring can have side surfaces that are axially larger than the magnet-carrying section. In a second embodiment, the magnetically conductive additional ring can have side surfaces that are axially smaller than the magnet-carrying section. In a third embodiment, the magnetically conductive additional ring can have side surfaces that are axially as large as the magnet-carrying section. Independently of the embodiment used, the at least one permanent magnet can be arranged on the magnetically conductive additional ring and the magnetically conductive additional ring can be fixed to the magnet-carrying section.

[0026] The magnetically conductive additional ring can be fixed to the magnet carrier by means of plastic by gluing or extrusion coating. It is possible, regardless of the embodiment variant, to apply the magnetically conductive additional ring to the magnet carrier in such a way that it protrudes axially beyond the side of the magnet carrier.

[0027] The magnetically conductive additional ring can, for example, increase the mechanical strength of the rotor molded body and, in particular if dipole magnets are used, can be designed as a yoke or, depending on the embodiment, can accommodate permanent magnets of a larger surface area.

[0028] The at least one permanent magnet can be fixed to the magnet carrier section by adhesive bonding using an adhesive, in particular a magnetic adhesive, which can include, for example, a binder that cures from a liquid state and in which metal particles are embedded.

[0029] The magnetic adhesive can be an adhesive that can connect materials in a form-fitting manner by surface attachment and / or adhesion or cohesion, thereby producing a composite material. The adhesive can in particular be a physically coagulated adhesive, a chemically hardened adhesive, or an adhesive without a curing mechanism. As a supplement to the adhesive, the magnetic adhesive can also have particles, which, for example, have magnetic properties. The particles can improve the application effect and / or improve the bonding properties of the magnetic adhesive when connecting the magnetic material, that is, the permanent magnet, to the rotor.

[0030] The at least one permanent magnet can be applied to the magnet carrier section by a bonding process, for which purpose the at least one permanent magnet can be applied to the magnet carrier section in a materially bonded manner so that a firm connection connects the at least one permanent magnet to the magnet carrier section.

[0031] The magnet carrier section and / or the magnetically conductive additional ring can have at least one recess and / or a recess, which forms a flow channel for conveying plastic material into the gap between the outer side wall of the magnet carrier section and the back side of the at least one permanent magnet facing the magnet carrier section during the extrusion coating of the one-piece rotor molded body with plastic material. By virtue of the fact that the plastic material can flow or be pressed into the gap between the outer side wall of the magnet carrier section and the back side of the at least one permanent magnet facing the magnet carrier section during the extrusion coating of the one-piece rotor molded body by means of at least one recess and / or at least one recess, the plastic material, which can still flow, presses the at least one permanent magnet radially outwards, in particular towards the inner wall of the injection mold, during the extrusion coating process. As a result, for example, when using a plurality of permanent magnets, it is possible to prevent or at least largely avoid the outer side surfaces of the permanent magnets from being covered by plastic material. Since the permanent magnets are pressed radially outwards due to the pre-stress in the gap, the permanent magnets rest flush with their outer sides against the inner wall of the injection mold and no plastic material can get between the outer sides of the permanent magnets and the inner wall of the injection mold. After the plastic material has hardened, the at least one permanent magnet or the plurality of permanent magnets are held in a materially bonded manner on the outer side wall of the one-piece rotor mold or magnet carrier section.

[0032] The at least one permanent magnet can be fixed to the magnet carrier section by extrusion coating the one-piece rotor molded body with plastic material.

[0033] The extrusion coating can be used to fix the permanent magnets. In this case, the plastic material is injected partially around the permanent magnets and under the permanent magnets by means of at least one recess and / or cutout. This ensures that the permanent magnets are spaced uniformly relative to the stator or in the annular gap and that the permanent magnets are fixedly mounted on the magnet carrier section.

[0034] The one-piece rotor molded body may have at least one end-side through-hole, which forms an overflow opening, which is designed to allow plastic material to overflow from one side of the one-piece rotor molded body to the opposite side of the one-piece rotor molded body during extrusion coating of the one-piece rotor molded body with the plastic material.

[0035] The at least one perforation can be designed as a hole having an opening which can have any desired geometric shape. In particular, the hole has an elliptical geometry which can be straight or curved.

[0036] The at least one perforation has the function of an overflow or flow channel, since the perforation allows plastic material to flow through from one side of the one-piece rotor molded body to the other side of the one-piece rotor molded body.

[0037] The motor shaft section can have a free stub which is designed for supporting the impeller on the motor shaft section and has a rolled portion and / or at least one flattened portion on its side wall for supporting the impeller in a rotationally fixed manner on the motor shaft section.

[0038] The rolling is designed as a cross-line embossing of the surface of the motor shaft section and is applied to the motor shaft section, for example, by milling, pressing or embossing. The rolling should increase the friction coefficient of the motor shaft section, thereby preventing slippage of components to be driven, such as, for example, a pump wheel, which is particularly applied to the motor shaft section.

[0039] The flattening is designed as a modification of the surface contour of the motor shaft section and changes the circular shape of the motor shaft section in cross section into one circular section or two circular sections. The modification of the motor shaft section is intended to prevent slippage of components to be driven, such as, for example, a pump wheel, which is particularly attached to the motor shaft section.

[0040] The starting sheet metal forming the integral rotor molded body can have magnetically conductive properties.

[0041] The starting sheet can in particular comprise a soft magnetic material which can be slightly magnetized in a magnetic field or can intensify an external magnetic field. Within the scope of the invention, the magnetic field of the at least one permanent magnet arranged on the magnet carrier section of the integral rotor molded body can be intensified by the starting sheet consisting of a soft magnetic material which forms the integral rotor molded body.

[0042] The motor shaft section can be designed as a hollow shaft which, in order to form a coaxial flow channel, has an opening at the opposite axial ends of the motor shaft section.

[0043] The hollow shaft can be used as a flow channel through which a liquid can flow when the motor shaft is in operation and / or when the motor shaft is at rest. The flow of liquid can cool the electric drive motor and / or meet the spatial requirements of a pipeline for discharging conveyed material, in particular liquid.

[0044] Furthermore, the object is achieved by a wet rotor pump having a pump chamber wall which delimits a wet chamber of the wet rotor pump, a pump wheel which is rotatably mounted in the wet chamber, and an electric drive motor according to one or more of the described embodiments which drives the pump wheel.

[0045] In particular, within the scope of the present invention, a "wet rotor pump" can refer to a pump assembly that, in addition to a pump wheel and a pump housing, also includes an electric drive motor, in particular a brushless DC motor, whose rotor or rotor-shaped body supported in a rotatable manner rotates in a liquid delivery medium. The delivery medium is the liquid delivered by the pump wheel of the wet rotor pump. For example, in the case of a dishwasher as a household appliance, the delivery medium is so-called washing liquid. For example, in the case of a washing machine as a household appliance, the delivery medium is so-called laundry liquid. Therefore, for the wet rotor pump, the rotor or rotor-shaped body supported in a rotatable manner rotating in the delivery medium is separated from the stator of the electric drive motor in a liquid-tight manner by means of a pump chamber wall. The stator is in this regard in the dry area of ​​the wet rotor pump, that is, hydraulically separated from the wet chamber in which the rotor supported in a rotatable manner rotates.

[0046] The motor shaft or motor shaft section is fixed in an exact coaxial position relative to the pump chamber wall and the stator, for example, by means of radial sliding bearings. For this purpose, the bearing structure completely surrounds the middle section of the motor shaft or the motor shaft section. Due to the function of the pump wheel, when the pump wheel rotates and thus when the motor shaft or the motor shaft section rotates, axial forces are introduced into the motor shaft or the motor shaft section in the axial direction by the pump wheel, which is arranged in the conveying medium, especially inside the wet chamber. This axial force in the axial direction is absorbed by the axial bearing.

[0047] In the case of a wet rotor pump, the bearing arrangement can have an end bearing cover which is fixedly connected to a pump chamber wall of the wet rotor pump, the end bearing cover carrying a bearing seat on which a bushing is formed, which includes a hub in which a central section of the motor shaft or the motor shaft section is rotatably supported.

[0048] The bearing cap can be designed as a component separate from the pump chamber wall and / or the pump housing, wherein the bearing cap can be inserted, in particular pressed into, into the cylindrical inner seat. The bearing cap can be fixedly connected to the pump chamber wall as a separate component.

[0049] The pump housing or the housing part of a multi-component pump housing can have the pump chamber wall. This can mean that the pump chamber wall is fixed to the pump housing or the housing part as a separate component. As an alternative, this can mean that the pump chamber wall is constructed integrally with the pump housing or the housing part. In the area of ​​the stator and the rotor or the rotor shaped body supported in a rotatable manner, the wall thickness of the pump chamber wall can be implemented to be particularly small. The pump chamber wall extends here through an annular gap, which separates the stator and the rotor or the rotor shaped body supported in a rotatable manner and in which the field of the electric drive motor functions according to its function.

[0050] The bearing seat of the end cap can have a cylindrical inner wall and the bushing can have a cylindrical outer wall corresponding to the cylindrical inner wall of the end cap and designed in such a way that the bushing can be inserted into the bearing seat with an exact fit.

[0051] The bearing cover can form an intermediate wall which separates a first subchamber of the wet chamber from a second subchamber of the wet chamber, wherein the rotor or rotor shaped body which is supported in a rotatable manner is arranged in the first subchamber, and wherein the pump wheel is arranged in the second subchamber. In this regard, both the first subchamber and the second subchamber are penetrated by the conveying medium. For this purpose, the flow channel of the hollow motor shaft can convey the conveying medium from the first subchamber to the second subchamber.

[0052] The pump wheel can be fastened to the axial end of the motor shaft section of the one-piece rotor molding.

[0053] The pump wheel can be used to transport the liquid in a moving manner. For this purpose, the pump wheel has a type of blade that enables the transport of the liquid in a moving manner.

[0054] Furthermore, the object is achieved by a domestic appliance, which can be in particular a dishwasher, a washing machine, a dryer or a cooker hood, having an electric drive motor and / or a wet rotor pump as described in accordance with one or more of the described embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Specific embodiments of the present invention are explained in detail in the following description with reference to the drawings. The specific features of these exemplary embodiments can represent general features of the present invention regardless of the specific context in which they are mentioned, if necessary also when viewed individually or in other combinations.

[0056] in:

[0057] Figure 1 An exploded view showing the configuration of an exemplary electric drive device;

[0058] Figure 2 A sectional view of a wet rotor pump having an electric drive according to the invention is shown;

[0059] Figure 3 A longitudinal section through a rotor shaped body constructed in one piece according to the present invention is shown;

[0060] Figure 4 Shows that according to Figure 3 An axial top view of the rotor shaped body constructed in one piece according to the present invention;

[0061] Figure 5 An exploded view of a rotor shaped body constructed in one piece is shown together with three permanent magnets which together complementarily form a magnetic ring which is applied to the rotor shaped body;

[0062] Figure 6 A longitudinal section through a rotor shaped body constructed in one piece with permanent magnets forming a three-component magnetic ring is shown;

[0063] Figure 7 A cross-sectional view of a rotor shaped body constructed in one piece with permanent magnets forming a three-component magnetic ring is shown;

[0064] Figure 8 A longitudinal section through an alternative embodiment of a one-piece rotor shaped body having a permanent magnet designed in three parts as a magnetic ring and a separately produced magnetically conductive additional ring is shown;

[0065] Fig. 9A perspective view of a rotor shaped body constructed in one piece, which has a motor shaft section designed as a hollow shaft and which also has flattened sections on the side walls of the shaft end;

[0066] Fig.10 Shows that according to Fig. 9 A three-dimensional view of the integrally constructed rotor shaped body with the mounted additional ring;

[0067] Fig.11 shows a side view of an alternative embodiment of a one-piece rotor shaped body with a rolled portion on the side wall of the shaft end, together with an attached additional ring; and

[0068] Fig.12 Shows that according to Fig.11 A top view of the end side of the rotor forming body. DETAILED DESCRIPTION

[0069] Figure 1 The structure of an exemplary electric drive device 10 is shown. In the present exemplary embodiment, the electric drive device 10 has a stator 1 with a stator winding 1a. The stator 1 is arranged on the outer side of a rotor housing 2a, which is designed to receive a rotor 2 including an integral rotor molded body 3 according to the present invention inside the annular stator 1. The integral rotor molded body 3 is arranged in accordance with the present invention. Figure 1 In the embodiment of , for example, three permanent magnets 12 are shown. The shaft of the one-piece rotor forming body 3 is placed in the sliding sleeve 4. The one-piece rotor forming body 3 and the sliding sleeve 4 are held in position in the rotor housing 2a by the insulated bearing end cover 5.

[0070] Figure 2 The electric drive device 10 is used in a wet rotor pump 6. The wet rotor pump 6 has a stator 1, which is fixed to the outer wall of a rotor housing 2a. Inside the rotor housing 2a, the rotor 2 is rotatably supported with its integral rotor molded body 3 by means of a sliding sleeve 4. The integral rotor molded body 3 is Figure 2 In the embodiment shown, a motor shaft section 3c is provided in the form of a hollow shaft. The bearing cover 5 of the wet rotor pump 6 has a bearing cover opening 7, through which the liquid flows into the wet chamber 8 of the wet rotor pump 6. The sliding sleeve 4 supporting the integral rotor molding 3 is positioned on the bearing cover 5. The liquid flows through the bearing cover 5. Figure 2As shown by the arrow in , the liquid flows through the wet chamber 8 and reaches the opening 16.1 on the end side of the hollow shaft of the integral rotor molded body 3 via the annular gap 9 between the permanent magnet 12 and the rotor housing 2a, and after flowing through the hollow shaft of the integral rotor molded body 3, it comes out at the opening on the axial end side of the hollow shaft of the integral rotor molded body 3.

[0071] Figure 3 The one-piece rotor molded body 3 according to the invention is shown, which has a magnet carrier section 3a, a connecting section 3b and a motor shaft section 3c. The connecting section 3b connects the magnet carrier section 3a and the motor shaft section 3c in one piece.

[0072] Figure 4 The end side of the connecting section 3c of the integral rotor body 3 is shown. The connecting section 3c, in the present embodiment, has, for example, three arc-shaped groove-like or slot-like channels 11, which lead to three corresponding holes 20 through which liquid can overflow from the outside of the integral rotor body 3 into the inside of the hollow cylindrical magnet carrier section 3a. Figure 3 In FIG. 2 , this corresponds to an overflow of liquid via the opening 20 from the left side of the connecting section 3 b to the right side of the connecting section 3 b.

[0073] Figure 5 An exemplary design of the one-piece rotor molded body 3 and of at least one permanent magnet is shown in an exploded view, wherein the permanent magnets 12 are combined to form a magnetic ring.

[0074] Figure 6 The one-piece rotor molded body 3 , on which the permanent magnets 12 are arranged, is shown in a cross-sectional view. Figure 7 Shows that according to Figure 6 sectional view of a one-piece rotor molded body 3 on which permanent magnets 12 are arranged.

[0075] Figure 8 An alternative embodiment of an integral rotor molded body 3 is shown, which has a magnet bearing section 3a, a connecting section 3b and a motor shaft section 3c. The connecting section 3b is also an integral connection of the magnet bearing section 3a and the motor shaft section 3c. However, an additional magnetically conductive additional ring 13 is arranged on the magnet bearing section 3a. Permanent magnets 12 are arranged on the magnetically conductive additional ring 13. The magnetically conductive additional ring 13 has a side surface that is larger than the magnet bearing section 3a in the axial direction, so that the magnetically conductive additional ring protrudes beyond the magnet bearing section at the end side. The magnet bearing section 3a, the magnetically conductive additional ring 13 and the permanent magnets 12 are extruded and encapsulated by a plastic material 14.

[0076] Fig. 9 The one-piece rotor molded body 3 is shown, which has a visible perforation 15 on the connecting section 3b. Fig.12 As can be seen in FIG. 1 , for example, three through-holes 15 can be provided on the connecting section 3b, which can overflow from the outside of the one-piece rotor body 3 into the interior of the hollow cylindrical magnet carrier section 3a during the extrusion coating of the rotor body 3 with plastic material 14, so as to also be able to extrusion coat the inner wall of the rotor body 3. The one-piece rotor body 3 is also provided with a flattened portion 17 on the side wall of the axial end of the motor shaft section 3c, which forms a torsion-proof member for a component to be fixed to the motor shaft section 3c, such as, for example, a pump wheel. In addition, in the present exemplary embodiment, the axial end of the motor shaft section 3c has an opening 16.2 on the shaft side.

[0077] Fig.10 The one-piece rotor body 3 is shown together with an additional ring 13 pressed onto the magnet carrier section 3a. In the present embodiment, the additional ring 13 has a plurality of recesses 18a or cutouts 18b, through which the plastic material 14 can also be squeezed in a liquid state between the outer side wall of the magnet carrier 3a of the one-piece rotor body 3 and the permanent magnet 12 during the extrusion coating of the rotor body 3 with the plastic material 14, so as to press the permanent magnet 12 radially outward inside the injection mold during the extrusion coating of the rotor body 3, so that the outer side wall of the permanent magnet 12 remains free of the plastic material 14.

[0078] List of reference numerals:

[0079] 1 Stator

[0080] 1a Stator winding

[0081] 2 Rotors

[0082] 2a Rotor housing

[0083] 3 One-piece rotor forming body

[0084] 3a Magnet bearing section

[0085] 3b Connection section

[0086] 3c Motor shaft section

[0087] 4 Sliding bushing

[0088] 5 Bearing end cover

[0089] 6 Wet rotor pump

[0090] 7 Bearing cover opening

[0091] 8 wet room

[0092] 9 Annular gap

[0093] 10. Drive device

[0094] 11 channels

[0095] 12 Permanent magnets

[0096] 13 Additional magnetic ring

[0097] 14 Plastic Materials

[0098] 15. Piercing

[0099] 16.1 Openings on the end

[0100] 16.2 Opening on the shaft end

[0101] 17 Flattening

[0102] 18a Recess

[0103] 18b Blank space

[0104] 20 holes.

Claims

1. An electric drive motor having a stator (1) with at least one electrically controllable stator winding (1a) and a rotor (2) supported in the field of the at least one controllable stator winding (1a) in a rotationally drivable manner while retaining an annular gap (9), the rotor having a motor shaft and a magnet carrier, the magnet carrier being arranged coaxially with the motor shaft and having at least one permanent magnet (12) arranged on the outer circumference of the magnet carrier, characterized in that The motor shaft and the magnet carrier are integrally constructed, wherein the motor shaft and the magnet carrier are manufactured together from a single original sheet material by forming into an integral rotor molded body (3), The one-piece rotor molded body (3) comprises a motor shaft section (3c) formed by deep drawing and a magnet support section (3a) formed by deep drawing. The one-piece rotor molded body (3) has a connecting section (3b) formed by deep drawing, which connects the motor shaft section (3c) and the magnet carrier section (3a) in one piece. The one-piece rotor molded body (3) has at least one end-side through-hole (15), the through-hole forming an overflow opening, the overflow opening being designed to allow the plastic material (14) to overflow from one side of the one-piece rotor molded body (3) to the opposite side of the one-piece rotor molded body (3) during extrusion coating of the one-piece rotor molded body (3), The magnet carrier section (3a) has at least one recess (18a) and / or a recess (18b), each of which forms a flow channel in order to convey the plastic material (14) into a gap between an outer side wall of the magnet carrier section (3a) and a back side of at least one permanent magnet (12) facing the magnet carrier section (3a) during extrusion coating of the one-piece rotor molded body (3) with the plastic material (14), The connecting section has three arc-shaped groove-like or slot-like channels (11), which lead to three corresponding holes (20), through which liquid can overflow from the outside of the one-piece rotor molded body (3) into the inside of the hollow cylindrical magnet carrier section (3a).

2. The electric drive motor according to claim 1, characterized in that: The motor shaft section (3c) is connected to the magnet carrier section (3a) at an axial end of the integral rotor molded body, and the magnet carrier section (3a) extends at least coaxially with the axis of the motor shaft section (3c) starting from this axial end.

3. The electric drive motor according to claim 1 or 2 has a separately manufactured magnetically conductive additional ring (13), which is fixed on the surface of the magnet-carrying section (3a) and on which the at least one permanent magnet (12) is arranged.

4. The electric drive motor according to claim 1 or 2, characterized in that: The at least one permanent magnet (12) is fixed to the magnet carrier section (3a) by gluing with the aid of a magnetic adhesive.

5. The electric drive motor according to claim 1 or 2, characterized in that: The at least one permanent magnet (12) is fixed to the magnet carrier section (3a) by extrusion coating the one-piece rotor molded body (3) with plastic material.

6. The electric drive motor according to claim 3, characterized in that: The magnetically conductive additional ring (13) has at least one recess (18a) and / or a recess (18b), each of which forms a flow channel so as to convey the plastic material (14) into a gap between an outer side wall of the magnet carrier section (3a) and a back side of at least one permanent magnet (12) facing the magnet carrier section (3a) during extrusion encapsulation of the one-piece rotor molded body (3) with the plastic material (14).

7. The electric drive motor according to claim 1 or 2, characterized in that: The motor shaft section (3c) has a free shaft end which is designed to support an impeller on the motor shaft section (3c) and has a rolled portion and / or at least one flattened portion (17) on a side wall thereof for supporting the impeller on the motor shaft section (3c) in a rotationally fixed manner.

8. The electric drive motor according to claim 1 or 2, characterized in that: The motor shaft section (3c) is designed as a hollow shaft which has openings at opposite shaft ends of the motor shaft section (3c) in order to form coaxial flow channels.

9. A wet rotor pump comprising: a pump chamber wall which delimits a wet chamber of the wet rotor pump; a pump wheel which is rotatably supported in the wet chamber; and an electric drive motor according to any one of claims 1 to 8 which drives the pump wheel.

10. The wet rotor pump according to claim 9, characterized in that The pump wheel is fixed to the axial end of the motor shaft section (3c) of the one-piece rotor molded body (3).

11. Household appliance having an electric drive motor according to any one of claims 1 to 8 or a wet rotor pump according to claim 9 or 10.

12. The household appliance according to claim 11, characterized in that The household appliance is configured as a dishwasher, a washing machine, a dryer or a range hood.

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