Electric machine having radial openings for impregnation and method for producing electric machine
By designing radially open grooves on the magnetic flux-carrying elements of the motor, the problem of resin residue during the impregnation process of the motor coil was solved, achieving uniform distribution and flow of resin and improving impregnation efficiency.
Patent Information
- Application Number
- CN202480048123.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-16
- Filing Date
- 2024-08-14
- Publication Date
- 2026-03-03
AI Technical Summary
In the prior art, resin tends to remain in undesirable areas during the impregnation process of motor coils, resulting in a long and uneven flow process.
The groove design with radial openings forms a flow channel on the magnetic flux-carrying element of the motor through insulation devices and/or groove closure devices, ensuring that the impregnating resin flows only in the required areas and avoiding unnecessary resin residue.
It achieves uniform distribution and flow of impregnating resin, reduces unnecessary resin residue, and improves impregnation efficiency and process time.
Smart Images
Figure CN121605565A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an electric motor having a flux-carrying element, such as a stator or rotor, and a current-carrying element, wherein the flux-carrying element has a body and a plurality of radially open grooves introduced into the body, in which coils forming electrical conductors are positioned, and the electrical conductors in the grooves are partially wound with insulating means and / or the respective grooves are closed with groove closing means. Background Technology
[0002] It is generally known to impregnate the windings of stator or rotor coils. In currently used spray impregnation systems, resin is sprayed onto the winding heads of the coils, and the resin is distributed under the influence of force, gravity, capillary force, and centrifugal force. However, a particular disadvantage in this regard is that impregnation of the winding heads can cause resin to reach areas where undesirable residues remain. These areas are, for example, the end faces of stator or rotor cores formed as laminated sections. Furthermore, the overall process time is increased due to the long effective time of the force-induced flow process. Summary of the Invention
[0003] The purpose of this invention is to provide an electric motor that can achieve impregnation more effectively.
[0004] This is achieved in general-purpose motors, where the insulation and / or groove closure each have radial openings for impregnating the coils. In this case, depending on the stator and rotor design, the radially open grooves can be radially open from the outside or inside, depending on whether the rotor is an inner or outer rotor. The flux-carrying element is preferably formed from a laminated core. Teeth are formed between two adjacent grooves in each case. The radial openings allow the impregnating resin for the coils to flow into certain areas.
[0005] Radial openings ensure that impregnation can be performed in the radial direction. Additionally, radial openings specify flow channels or flow directions to limit the diffusion of the impregnating resin and ensure that the impregnating resin can flow between coil windings formed by electrical conductors.
[0006] Advantageous embodiments are claimed in the dependent claims and are described in more detail below.
[0007] It is advantageous if the radial opening is formed along the longitudinal direction of the groove. In this respect, the maximum extension of the opening is in the longitudinal direction of the groove. This ensures a flexible design for the radial opening. Preferably, the radial opening can even extend from the first axial end face of the groove to the second axial end face of the groove. Thus, a gap is formed between the first and second axial end faces through the opening. Here, the sections of the groove sealing device and / or insulation device contact each other circumferentially on two opposite sides. In this respect, the position of the radial opening in the width direction is flexible, and preferably the radial opening is located at the center of the groove in the width direction. This ensures a uniform distribution of the impregnating resin in the groove. The groove sealing device and / or insulation device is preferably designed to be slotted in the longitudinal direction.
[0008] Alternatively, radial openings can be formed along the width of the groove. In this respect, the maximum extension of the opening is in the width direction of the groove. This ensures flexible design of the radial opening. Preferably, the radial opening can extend from the first circumference to the second circumference of the same groove, wherein (in each case), the two sides of the groove closing device and / or insulation device are opposite to each other in the longitudinal direction. In this respect, the position of the radial opening in the longitudinal direction is flexible, and preferably the radial opening is located at the center of the longitudinal groove. This ensures uniform distribution of the impregnating resin in the groove. The groove closing device and / or insulation device is preferably designed to be slotted along the width direction.
[0009] It is advantageous if the groove closure device has multiple closure elements located within the groove and radial openings positioned between the closure elements. Preferably, the groove closure device consists of two groove closure elements arranged a distance apart from each other in the longitudinal or width direction of the groove. Here, the radial openings are formed as gaps, which are formed between opposite sides of the groove closure elements according to their extension in the longitudinal or width direction, such that the groove closure device is formed in a separated manner. Alternatively, however, the groove closure device can also be formed by multiple groove closure elements within the groove.
[0010] Furthermore, the insulating device can have multiple segments, and radial openings can be positioned between the segments. Preferably, the insulating device is designed as multi-part, and more preferably as two-part, wherein the radial openings are positioned between the segments along the longitudinal or width direction. Here, the radial openings are formed as gaps that extend along the longitudinal or width direction between opposite sides of the segments, such that the insulating device is formed separately. Alternatively, however, the insulating device can also be formed from multiple segments in a groove.
[0011] Advantageously, the insulating material is insulating paper.
[0012] Additionally, the radial opening can be a through-hole with a circular, rectangular, or elliptical cross-section. This allows for particularly flexible opening design, which can be selected based on the motor design.
[0013] Furthermore, it is advantageous if multiple openings exist in the insulating device and / or the groove closure device, preferably arranged to be distributed and / or extended in the longitudinal or width direction. This can further improve the impregnation process.
[0014] The present invention also relates to a method for manufacturing an electric motor as described above, the electric motor having a flux-carrying element formed of a laminated core, wherein, in a first step, an electrical conductor wound as a coil is positioned in a groove of the flux-carrying element, wherein the electrical conductor is partially wound with an insulating device; in a second step, a groove closing device is positioned in each groove of the groove, wherein the insulating device and / or the groove closing device has a radial opening; and in a third step, the laminated core and the insulating device and / or the groove closing device are sprayed radially from the axial direction with an impregnating resin.
[0015] This method ensures that the impregnating resin reaches only the desired partial area. In this case, the impregnating resin flows radially between the coil winding and the groove. Furthermore, by impregnating only a partial area, direct impregnation is ensured, eliminating the need for a flow process to distribute the impregnating resin in geometrically irregular flow channels. Overall, direct resin impregnation is performed, thereby directly filling the radial openings. Since the resin is introduced only into the areas of the radial openings, areas spaced apart from these areas, such as the two axial end faces of the flux-carrying element at the winding head, remain unimpregnated. Attached Figure Description
[0016] Various advantageous embodiments of the invention will now be described in more detail with reference to the accompanying drawings.
[0017] In the attached diagram: Figure 1 A three-dimensional view shows a flux-carrying element in the form of a stator. Figure 2 The second embodiment is shown according to Figure 1 A cross-sectional view of a stator with a grooved sealing device, and Figure 3 The cross-sectional view shows the results according to Figure 1 The stator is in the glue injection position. Detailed Implementation
[0018] The accompanying drawings are merely illustrative in nature and are intended only to aid in understanding the invention. The same elements are given the same reference numerals. Features of the various embodiments are interchangeable and can be used as alternatives / cumulatively.
[0019] Figure 1 An electric motor according to the invention is shown, the motor having a flux-carrying element 1 and a current-carrying element (not shown here), wherein the flux-carrying element 1 has a body 2 and a plurality of radially open grooves 3 introduced into the body 2, wherein a coil 5 wound as an electrical conductor 4 is positioned in the grooves 3, and the electrical conductor 4 in the grooves 3 is partially wound with an insulating device 6 (see See...). Figure 2 The insulating device 6 and / or the groove sealing device 7 are used to seal the corresponding groove 3. It should be emphasized that the insulating device 6 and / or the groove sealing device 7 have radial openings 8 for impregnating the coil 5.
[0020] For better illustration, an axial direction 9, a radial direction 10, and a circumferential direction 11 are defined. The axial direction 9 describes the extension of the flux-carrying element 1 along the central axis 12, and the radial direction 10 is vertically aligned with the axial direction 9. The circumferential direction 11 describes the potential direction of rotation of the rotor (not shown here).
[0021] In this embodiment, the flux-carrying element 1 is designed as a stator 13.
[0022] The stator 13 is composed of a plurality of individual laminations stacked along the axial direction 9. The stator 13 has a plurality of grooves 3 distributed along the circumferential direction 11, which are evenly arranged relative to each other and extend along the axial direction 9. The coil 5 is positioned in the grooves 3. The coil 5 is positioned in the grooves 3 such that, in the axial direction 9, a first winding head 15 is arranged on a first axial end face 14 (of the groove 3), and a second winding head 17 is arranged on a second axial end face 16 (of the groove 3). These end faces 14, 16 directly form the axial end faces 30, 31 of the body 2.
[0023] Teeth 18 are formed between two corresponding grooves 3. In each case, the two teeth 18 of the groove 3, which are opposite each other in the circumferential direction, have protrusions in the form of pole pieces 19 extending in the circumferential direction 11, which are opposite each other. A gap is also formed between these pole pieces 19.
[0024] In this embodiment, the groove sealing device 7 is arranged in the groove 3, located between the two teeth 18 in each case. The groove sealing device 7 has two sealing elements 20, 21, namely a first sealing element 20 and a second sealing element 21. The sealing elements 20, 21 are arranged spaced apart from each other in the axial direction 9 along the longitudinal direction 22—which corresponds to the axial direction 9 of the groove 3—such that a radial opening 8 is formed between the two sealing elements 20, 21. In this case, the radial opening extends from the first circumferential side 34 of the groove 3 to the second circumferential side.
[0025] Therefore, the groove closing device 7 is designed as two parts. The two closing elements 20, 21 have a gap in the form of a radial opening 8 in the longitudinal direction. The two closing elements 20, 21 have the same shape.
[0026] Figure 2 The second embodiment is shown according to Figure 1 A cross-sectional view of the stator 13 with a grooved sealing device 7. The grooved sealing device 7 is designed to have a radial opening 8, which is centrally formed as a through hole in the width direction 23 and the circumferential direction 11 of the grooved sealing device 7. The grooved sealing device 7 is positioned in the radial direction 10 on the corresponding lower surface 24 of the pole piece 19 and spaced apart from the upper surface 25 of the winding 26 of the coil 5.
[0027] The insulating device 6 rests against the sides 27 and bottom 28 of the groove 3. The insulating device 6, designed as insulating paper, is designed to be open on the upper surface, which is aligned radially 10 opposite to the lower surface 29 of the groove closure device 7, by means of radial openings 8. With the aid of these two radial openings, the winding 26 of the coil 5 can be immersed in the groove 3.
[0028] Figure 3 The injection points for the impregnating resin used in the stator 13 are shown. The injection points are spaced apart in the axial direction 9 from the winding heads 15, 17 of the end faces 30, 31 and the corresponding axial end faces 14, 16. The impregnation direction is defined by the impregnation direction 32 in the radial direction 10 (radially inward toward the body 2). The impregnation area 33 is limited to a portion in the axial direction 9, thereby also forming a portion along the axial direction 9 that is not actively impregnated.
[0029] The foregoing explanation is based on a specific exemplary embodiment of the stator 13 described in the accompanying drawings. However, these explanations also apply to the rotor.
[0030] List of reference numerals 1. Flux-carrying element 2. Main Body 3 grooves 4. Electrical conductors 5 coils 6. Insulation devices 7. Groove sealing device 8 Radial openings 9. Axial direction 10 Radial direction 11. Circumferential direction 12. Central axis 13 Stator 14 First Axial End Face 15 First winding head 16 Second Axial End Face 17 Second winding head 18 teeth 19 Electrode 20 First groove closing element 21 Second groove closing element 22. Vertical direction 23 Width direction 24 Lower face 25 upper surface 26 windings 27 Side View 28 Bottom 29 lower face 30 First end face 31 Second end face 32. Impregnation direction 33 areas 34 First week to the side 35 Second week, lateral
Claims
1. An electric motor having a flux-carrying element (1) and a current-carrying element, wherein, The flux-carrying element (1) has a body (2) and a plurality of grooves (3) introduced into the body (2), in which a coil (5) forming an electrical conductor (4) is positioned, and the electrical conductor (4) in the groove (3) is partially wound with an insulating device (6), and / or the corresponding groove (3) is closed with a groove closing device (7), characterized in that the insulating device (6) and / or the groove closing device (7) have radial openings (8) for impregnating the coil (5).
2. The motor according to claim 1, characterized in that, The radial opening (8) is formed along the longitudinal direction (22) of the groove (3).
3. The motor according to claim 1 or 2, characterized in that, The radial opening (8) extends from the first axial end face (14) of the same groove (3) to the second axial end face (16).
4. The motor according to claim 1, characterized in that, The radial opening (8) is formed along the width direction (23) of the groove (3).
5. The motor according to claim 1 or 4, characterized in that, The radial opening (8) extends from the first circumferential side (34) of the same groove (3) to the second circumferential side (35).
6. The motor according to any one of the preceding claims, characterized in that, The groove sealing device (7) has a plurality of sealing elements (20, 21), and the radial opening (8) is positioned between the sealing elements (20, 21).
7. The motor according to any one of the preceding claims, characterized in that, The insulating device (6) has multiple segments, and the radial opening (8) is positioned between the segments.
8. The motor according to any one of the preceding claims, characterized in that, The insulating device (6) is insulating paper.
9. The motor according to any one of claims 1 to 8, characterized in that, The opening (8) is a through hole with a circular, rectangular or elliptical cross-section.
10. A method for manufacturing an electric motor according to any one of the preceding claims, the electric motor having a flux-carrying element (1) formed of a laminated core, wherein, In the first step, a coil (5) forming an electrical conductor (4) is positioned in a groove (3) of the flux-carrying element (1), wherein the electrical conductor (4) is partially wound with an insulating device (6). In the second step, a groove closing device (7) is positioned in each groove of the groove (3), wherein the insulating device (6) and / or the groove closing device (7) has a radial opening (8). In the third step, the body (2) is sprayed with impregnating resin at a specific axial position on the radially inner side of the body, such that the impregnating resin flows into the groove (3) including the insulating device (6) and / or the groove closing device (7), and the impregnating resin is distributed in both the radial and axial directions in the groove (3).