Abstract
An electric drive motor has a stator with at least one electrically energizable stator winding, and a rotor which is mounted in a rotationally driveable manner in the field of the at least one stator winding so as to leave free an annular gap. The motor also has a motor shaft and a magnet carrier which is arranged coaxially in relation to the motor shaft and has at least one permanent magnet which is arranged on an outer periphery of the magnet carrier. The motor shaft and the magnet carrier are of integral design by way of the motor shaft and the magnet carrier being jointly produced from an individual starting metal sheet by shaping to form an integrally shaped rotor body. There is also described a wet-rotor pump and a domestic appliance having an electric drive motor of this kind.
Claims
1-14. (canceled)
15. An electric drive motor, comprising: a stator with at least one electrically-actuatable stator winding; rotor rotatably mounted in a field of said stator winding and leaving free an annular gap; a motor shaft and a magnet carrier, said magnet carrier being arranged coaxially in relation to said motor shaft and having at least one permanent magnet arranged on an outer periphery of said magnet carrier; said motor shaft and said magnet carrier being integrally formed in one piece, with said motor shaft and said magnet carrier being jointly produced from a single initial metal sheet formed into an integrally shaped rotor body.
16. The electric drive motor according to claim 15, wherein said integrally shaped rotor body has a motor shaft section formed by deep drawing and a magnet carrier section formed by deep drawing.
17. The electric drive motor according to claim 16, wherein said integrally shaped rotor body has a connecting section formed by deep drawing, and said connecting section connects said motor shaft section to said magnet carrier section as an integral design.
18. The electric drive motor according to claim 17, wherein said motor shaft section is joined to said magnet carrier section at an axial end face of said integrally shaped rotor body and said magnet carrier section, starting from the axial end face, extends substantially coaxially to an axis of said motor shaft section.
19. The electric drive motor according to claim 16, further comprising a separately produced magnetically conducting supplementary ring fastened to a surface of said magnet carrier section of said integrally shaped rotor body, and wherein said at least one permanent magnet is arranged on said supplementary ring.
20. The electric drive motor according to claim 16, wherein said at least one permanent magnet is glued to said magnet carrier section by way of a magnetic adhesive.
21. The electric drive motor according to claim 16, wherein said at least one permanent magnet is fastened to said magnet carrier section by insert molding of said integrally shaped rotor body with a plastic material.
22. The electric drive motor according to claim 21, wherein said integrally shaped rotor body has at least one end-face side breakthrough, forming an overflow opening for an overflow of plastic material from one side of said integrally shaped rotor body to an opposite side of said integrally shaped rotor body during an insert molding of said integrally shaped rotor body with the plastic material.
23. The electric drive motor according to claim 19, wherein said magnet carrier section and/or said magnetically conducting supplementary ring is formed with at least one pocket and/or a recess, each forming a flow channel for conveying plastic material in a gap between an outer surface wall of said magnet carrier section and a rear side of said at least one permanent magnet facing towards said magnet carrier section during an insert molding of said integrally shaped rotor body with the plastic material.
24. The electric drive motor according to claim 16, wherein said motor shaft section has a free shaft end configured for bearing a running wheel on said motor shaft section, and an outer surface of said free shaft end is formed with knurling and/or a flat portion for torsion-proof bearing of the running wheel on said motor shaft section.
25. The electric drive motor according to claim 16, wherein said motor shaft section is a hollow shaft formed with an opening on opposite shaft ends for forming a coaxial flow channel through said motor shaft section.
26. A wet rotor pump, comprising: a pump chamber wall delimiting a wet space of the wet rotor pump; a pump wheel mounted rotatably in the wet space; and an electric drive motor according to claim 15 for rotatably driving said pump wheel.
27. The wet rotor pump according to claim 26, wherein said pump wheel is fastened to a shaft end of a motor shaft section of said integrally shaped rotor body.
28. A household appliance, comprising: wet rotor pump having a pump chamber wall delimiting a wet space of the wet rotor pump, and a pump wheel mounted rotatably in said wet space; and an electric drive motor according to claim 15 for rotatably driving said pump wheel in said wet space.
29. The household appliance according to claim 28 being a dishwasher, a washing machine, a dryer, or an extractor hood.
Description
[0056] In the figures:
[0057] FIG. 1 shows an exploded view of the design of an example of an electric drive;
[0058] FIG. 2 shows a sectional representation of a wet rotor pump with the inventive electric drive motor;
[0059] FIG. 3 shows a longitudinal sectional representation of an inventive shaped rotor body embodied as an integral design;
[0060] FIG. 4 shows an axial overhead view of the inventive shaped rotor body embodied as an integral design in accordance with FIG. 3;
[0061] FIG. 5 shows an exploded view of the shaped rotor body embodied as an integral design and three permanent magnets, which supplementing each other form a magnet ring, which is placed on the shaped rotor body;
[0062] FIG. 6 shows a longitudinal sectional representation of the shaped rotor body embodied as an integral design with the permanent magnets, which form a three-part magnet ring;
[0063] FIG. 7 shows a cross-sectional representation of the shaped rotor body embodied as an integral design with the permanent magnets, which form the three-part magnet ring;
[0064] FIG. 8 shows a longitudinal sectional representation of an alternate form of embodiment of a shaped rotor body embodied as an integral design with the permanent magnets, which are embodied as a three-part magnet ring, and a separately produced magnetically conducting supplementary ring;
[0065] FIG. 9 shows a perspective diagram of the shaped rotor body embodied as an integral design with a motor shaft section embodied as a hollow shaft, which moreover has a flat portion on the outside surface wall of the shaft end;
[0066] FIG. 10 shows a perspective diagram of the shaped rotor body embodied as an integral design in accordance with FIG. 9 with a supplementary ring placed thereon;
[0067] FIG. 11 shows a side view of an alternate form of embodiment of a shaped rotor body embodied as an integral design, which has knurling on the outer wall of the shaft end, with a supplementary ring placed thereon, and
[0068] FIG. 12 shows a front overhead view of the shaped rotor body in accordance with FIG. 11.
[0069] FIG. 1 shows the structure of an example of an electric drive 10. In the case of this exemplary embodiment the electric drive 10 has a stator 1 with a stator winding 1a. The stator 1 is arranged on an outer side of a rotor housing 2a, which is embodied to accommodate a rotor 2 comprising an inventive integral shaped rotor body 3 inside the annular stator 1. The integral shaped rotor body 3 is shown in the form of embodiment in accordance with FIG. 1 with three permanent magnets 12 for example. The shaft of the integral shaped rotor body 3 sits in a sliding bearing bush 4. The integral shaped rotor body 3 and the sliding bearing bush 4 are held in position in the rotor housing 2a by a terminating bearing end shield 5.
[0070] FIG. 2 shows a use of the electric drive 10 in a wet rotor pump 6. The wet rotor pump 6 has the stator 1, which is fastened to an outer wall of the rotor housing 2a. Within the rotor housing 2a the rotor 2 with its integral shaped rotor body 3 is mounted rotatably by means of the sliding bearing bush 4. The integral shaped rotor body 3, in the form of embodiment shown in FIG. 2, is embodied with a motor shaft section 3c in the form of a hollow shaft. A bearing end shield 5 of the wet rotor pump 6 has bearing end shield openings 7 through which a fluid flows into the wet chamber 8 of the wet rotor pump 6. Positioned on the bearing end shield 5 is the sliding bearing bush 4 supporting the integral shaped rotor body 3. The fluid flows through the wet chamber 8, as indicated by the arrows in FIG. 2, and gets to an end-face side opening 16. 1 of the hollow shaft of the integral shaped rotor body 3 via an annular gap 9 between the permanent magnets 12 and the rotor housing 2a and, after flowing through the hollow shaft of the integral shaped rotor body 3, comes out again at the shaft-end side opening of the hollow shaft of the integral shaped rotor body 3.
[0071] FIG. 3 shows the inventive integral shaped rotor body 3, which has a magnet carrier section 3a, a connecting section 3b and the motor shaft section 3c. The connecting section 3b connects the magnet carrier section 3a to the motor shaft section 3c as an integral design.
[0072] FIG. 4 shows the end face side on the connecting section 3c of the integral shaped rotor body 3. In the case of the present exemplary embodiment the connecting section 3c has, for instance, three curved, grooved or fluted channels 11 which open out into three corresponding holes 20, via which fluid can overflow from outside the integral shaped rotor body 3 into the inside of the hollow cylindrical magnet carrier section 3a. In FIG. 3 this corresponds to an overflowing of fluid via the hole 20 from the left side of the connecting section 3b to the right side of the connecting section 3b.
[0073] FIG. 5 shows an example of the structure of the integral shaped rotor body 3 and of the at least one permanent magnet in an exploded diagram, wherein the permanent magnets 12 combined form a magnet ring.
[0074] FIG. 6 shows the integral shaped rotor body 3, upon which the permanent magnets 12 are arranged, in a sectional diagram.
[0075] FIG. 7 shows a sectional diagram of the integral shaped rotor body 3 in accordance with FIG. 6 on which the permanent magnets 12 are arranged.
[0076] FIG. 8 shows an alternate form of embodiment of an integral shaped rotor body 3, which has the magnet carrier section 3a, the connecting section 3b and the motor shaft section 3c. Here the connecting section 3b is also the integral connection of the magnet carrier section 3a to the motor shaft section 3c. However an additional magnetically conducting supplementary ring 13 is arranged on the magnet carrier section 3a. The permanent magnets 12 are arranged on the magnetically conducting supplementary ring 13. The magnetically conducting supplementary ring 13 has an axially larger outer surface than the magnet carrier section 3a, whereby the end side of the magnetically conducting supplementary ring projects beyond the magnet carrier section. The magnet carrier section 3a, the magnetically conducting supplementary ring 13 and the permanent magnets 12 have a plastic material 14 insert molded around them.
[0077] FIG. 9 shows the integral shaped rotor body 3, which has a visible breakthrough on the connecting section 3b. As can be seen in FIG. 12 in particular, three breakthroughs 15 can be provided on the connecting section 3b, via which during an insert molding of the shaped rotor body 3 with plastic material 14, said material can overflow from the outside of the integral shaped rotor body 3 into the inside of the hollow cylindrical magnet carrier section 3a, in order to also be able to insert mold around the inner wall of the integral shaped rotor body 3. The integral shaped rotor body 3 is moreover provided with a flat portion 17 on the outer surface wall of the shaft end of the motor shaft section 3c, which forms a torsion proofing for a component, such as a pump wheel for example, to be fastened to the motor shaft section 3c. In the case of the present exemplary embodiment, the shaft end of the motor shaft section 3c also has a shaft-side opening 16.2.
[0078] FIG. 10 shows the integral shaped rotor body 3 with a supplementary ring 13 pressed onto the magnet carrier section 3a. In the case of the present exemplary embodiment the supplementary ring 13 has a number of pockets 18a or recesses 18b, via which, during an insert molding of plastic material 14 around the shaped rotor body 3, this plastic material, still in its fluid state, can penetrate between an outer surface wall of the magnet carrier section 3a of the integral shaped rotor body 3 and the permanent magnets 12, in order to push the permanent magnets 12 radially outwards within the injection mold during an insert molding of the shaped rotor body 3, so that the outer surface walls of the permanent magnets 12 remain free from plastic material 14.
LIST OF REFERENCE CHARACTERS
[0079] 1 Stator [0080] 2 Stator winding [0081] 2 Rotor [0082] 2a Rotor housing [0083] 3 Integral shaped rotor housing [0084] 3a Magnet carrier section [0085] 3b Connecting section [0086] 3c Motor shaft section [0087] 4 Sliding bearing bush [0088] 5 Bearing end shield [0089] 6 Wet rotor pump [0090] 7 Bearing end shield openings [0091] 8 Wet chamber [0092] 9 Annular gap [0093] 10 Drive [0094] 11 Channels [0095] 12 Permanent magnets [0096] 13 Magnetically conducting supplementary ring [0097] 14 Plastic material [0098] 15 Breakthrough [0099] 16.1 End face opening [0100] 16.2 Shaft end-face side opening [0101] 17 Flat portion [0102] 18a Pockets [0103] 18b Recesses [0104] 20 Holes
