Stator structure, outer rotor motor and fixing method of stator winding

Abstract

The application provides a stator, an external rotor motor comprising the stator and a method for fixing a stator winding of the stator, wherein the stator comprises a stator support and a plurality of stator coils distributed circumferentially along the stator support, the stator coil comprises a stator lamination and a coil wound on the stator lamination; each of the stator coils is a plurality of parallel stator coils, and each of the stator coils is a multi-phase winding coil; the stator further comprises a conductive part, the number of phases of the multi-phase winding coil is N, and the conductive part comprises a first conductive ring and N second conductive rings; the wire tail of each phase winding coil is electrically connected to the first conductive ring; and the wire head of each phase winding coil is electrically connected to the corresponding second conductive ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric motor, in particular to a stator structure, an outer rotor motor and a fixing method of stator winding. BACKGROUND

[0002] The outer rotor motor is a kind of motor in which the rotor magnetic steel is located outside the stator core. The outer rotor motor has the advantages of large torque, many pole numbers, thin size and compact structure. However, the outer rotor motor has the disadvantages of high requirement for rotor dynamic balance, large vibration and large moment of inertia, which is not suitable for high speed. The outer rotor motor is mainly used in mechanical arm, unmanned aerial vehicle, hub motor and the like. The stator winding of the outer rotor motor includes series winding and parallel winding. The series winding is suitable for high voltage and low current power supply, and the parallel winding is suitable for low voltage and high current power supply. When the parallel winding is used, each parallel coil is wound, and each phase of the parallel winding is welded and connected. The series winding is shaped and bound at the end of the winding. When the number of parallel branches is large, the size of the end of the outer rotor motor is increased, and the shaping and binding are difficult. SUMMARY

[0003] In order to solve at least one of the above technical problems, the present application provides a stator structure, an outer rotor motor and a fixing method of stator winding.

[0004] According to one aspect of the present application, a stator for an outer rotor motor includes a stator support and a plurality of stator coils distributed circumferentially along the stator support, each of the stator coils including a stator lamination and a coil wound on the stator lamination.

[0005] Each of the stator coils is a plurality of parallel stator coils, and each of the stator coils is a multi-phase winding coil.

[0006] The stator further includes a conductive portion, the number of phases of the multi-phase winding coil is N, and the conductive portion includes a first conductive ring and N second conductive rings.

[0007] The wire tail of each phase winding coil is electrically connected to the first conductive ring.

[0008] The wire head of each phase winding coil is electrically connected to the corresponding second conductive ring.

[0009] According to at least one embodiment of the present application, the first conductive ring and each of the second conductive rings are a plurality of annular electrodes arranged at intervals.

[0010] According to at least one embodiment of the present application, the first conductive ring and each of the second conductive rings are concentric circular structures, and the first conductive ring is arranged at the outermost side of the concentric circular structure.

[0011] The second conductive ring located at the innermost side of the concentric structure has a second hole for the shaft of the stator to pass through.

[0012] According to at least one embodiment of the present application, the stator further comprises at least one holder arranged along the radial direction of the concentric structure, each of the conductive rings is detachably connected with the holder, and the holder is made of insulating material.

[0013] According to at least one embodiment of the present application, the stator further comprises a fixing device for fixing the holder on the stator support.

[0014] The fixing device comprises a plurality of screws, a plurality of third holes are distributed along the length direction of the holder, and one end of each of the screws is screwed through the third hole to the stator support.

[0015] According to at least one embodiment of the present application, each of the first conductive ring and each of the second conductive rings is a plate-shaped ring, and each of the plate-shaped rings has a first hole for the lead wire of the winding coil of the corresponding phase to pass through.

[0016] According to at least one embodiment of the present application, the lead wire of the winding coil of each phase is wound on the conductive ring through the corresponding first hole, and the lead wire is welded to the corresponding conductive ring.

[0017] According to at least one embodiment of the present application, the shaft of the stator has a hollow cavity, and the lead wire of the winding coil of each phase is fixedly connected to the corresponding conductive ring after passing out of the cavity.

[0018] The present application also aims to provide an outer rotor motor, and the stator of the outer rotor motor is the above-mentioned stator.

[0019] The present application aims to provide a stator winding fixing method, comprising the following steps:

[0020] Fixing the shaft and the coil-wound stator sheet to the stator support;

[0021] Passing the wire tail of each coil through the first hole of the first conductive ring, and welding the wire tail of the wire head to the first conductive ring;

[0022] Passing the wire head of each coil through the first hole of the corresponding second conductive ring, and welding the wire head of each coil to the corresponding second conductive ring;

[0023] According to the radial direction of the stator support, sequentially pushing the corresponding conductive ring to the assembly surface of the stator support from inside to outside, and fixing the first conductive ring and the second conductive ring to the stator support through the holder and the screw;

[0024] The wire tail and the wire head of each coil are welded first, and then the high-temperature insulating tape is wound on the surface of the first conductive ring and the plurality of second conductive rings.

[0025] The beneficial effects of the present application are as follows: the present application connects the wire tail of each phase winding coil to the first conductive ring and connects the wire head of each phase winding coil to the corresponding second conductive ring, so that the wire heads of the plurality of winding coils are dispersed in the circumferential direction of the corresponding conductive ring, avoiding the technical problem of increasing the size of the outer rotor motor caused by the accumulation of wire heads, which is beneficial to the miniaturization design of the motor structure; at the same time, a plurality of conductive rings are arranged, each conductive ring corresponds to a plurality of winding coils, the welding is more intuitive and simple, the operability is stronger, and it is also beneficial to check the correctness of the wiring and troubleshoot in the later period; and the plurality of conductive rings connect the winding coils to form a loop, so that the stator structure has stronger overcurrent capacity. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings illustrate exemplary embodiments of the present application and together with the general description of the application given above and the detailed description of the application given below, serve to explain the principles of the present application. These drawings are included herewith and constitute a part of this specification.

[0027] Figure 1 is a structure diagram of a stator according to an embodiment of the present application.

[0028] Figure 2 is an assembly diagram of a stator support, a stator winding and a shaft according to an embodiment of the present application.

[0029] Figure 3 is an assembly diagram of a stator coil, a first conductive ring, a second conductive ring, a retainer, a stator support and a screw according to an embodiment of the present application.

[0030] Figure 4 is a winding diagram of a stator coil according to an embodiment of the present application.

[0031] Reference signs: 1-stator support; 2-stator coil; 3-stator lamination; 4-first conductive ring; 5-second conductive ring; 6-retainer; 7-shaft; 8-screw; 9-first hole; 10-conductive wire. DETAILED DESCRIPTION

[0032] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related content, and are not a limitation on the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for ease of description.

[0033] It should be noted that the embodiments and features in the present application can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0034] Please refer to Figure 1 According to the first embodiment of the present application, a stator for an external rotor motor is provided, the stator comprising a stator support 1, and a plurality of stator coils 2 distributed circumferentially along the stator support 1, the stator coil 2 comprising a stator lamination 3 and a coil wound on the stator lamination 3; each stator coil 2 is a plurality of parallel stator coils 2, and each stator coil 2 is a multi-phase winding coil; the stator further comprises a conductive part, the number of phases of the multi-phase winding coil is N, and the conductive part comprises a first conductive ring 4 and N second conductive rings 5; the wire tail of each phase winding coil is electrically connected to the first conductive ring 4; and the wire head of each phase winding coil is electrically connected to the corresponding second conductive ring 5.

[0035] It can be understood that the plurality of parallel stator coils 2 of each stator coil 2 means that the same phase stator coils 2 are connected in parallel.

[0036] In fact, the number of phases of the multi-phase winding coil can be single-phase or multi-phase, that is, the value of N is in the range of N≥1. Please refer to Figure 1 and Figure 3 In some embodiments, N=3, so that three second conductive rings 5 are provided, and the following explanations and descriptions are all based on three second conductive rings 5.

[0037] Since the stator coils 2 are circumferentially arranged around the stator support 1, the wire tails and wire heads of the winding coils are also distributed circumferentially along the stator support 1. At the same time, since the first conductive ring 4 and each second conductive ring 5 are a plurality of annular electrodes arranged at intervals, the wire tails and wire heads of the winding coils only need to be welded to the corresponding fan-shaped areas. That is, the wire tails and wire heads of the winding coils are dispersed, thereby avoiding the problems of increased winding end size, increased shaping difficulty, difficulty in checking the correctness of wiring and subsequent troubleshooting, etc. caused by welding all the wire tails and wire heads of the winding coils together.

[0038] The wire tails of the coils can be fixed to the first conductive ring 4 and the wire heads of the winding coils can be fixed to the second conductive ring 5 by existing fixing methods, such as binding, and in some embodiments, by welding.

[0039] In order to achieve a more secure connection, please refer to Figure 3In some embodiments, the first conductive ring 4 and each of the second conductive rings 5 are plate-shaped rings, and each of the plate-shaped rings has a first hole 9 through which the lead wire 10 of the winding coil of the corresponding phase passes. That is, the wire head of the winding coil, i.e., the wire tail or the wire head of the winding coil, passes through the first hole 9 and is then welded, so that the welding is more firm and less likely to loosen. On this basis, the wire head of the winding coil, i.e., the wire tail or the wire head of the winding coil, passes through the corresponding first hole 9 and is wound on the conductive ring, and the wire head of the winding coil is then welded and connected to the corresponding conductive ring, so that the pre-fixing can be performed through the first hole 9, the welding operation is more convenient, and the connection is more reliable.

[0040] Please refer to Figure 1 and Figure 3 In some embodiments, the first conductive ring 4 and each of the second conductive rings 5 are concentric circular structures, and the first conductive ring 4 is arranged at the outermost side of the concentric circular structure. The second conductive ring 5 at the innermost side of the concentric circular structure has a second hole through which the shaft 7 of the stator passes. Since the first conductive ring 4 and each of the second conductive rings 5 are concentric circular structures, the distance from the wire head of each winding coil to the corresponding conductive ring can be ensured to be equal. At the same time, since the wire tails of all winding coils are connected to the first conductive ring 4, the wire heads fixed on the first conductive ring 4 are the most, and the first conductive ring 4 arranged at the outermost side is more convenient for fixing the wire tails of the winding coils of each phase.

[0041] In fact, the spacing of the conductive rings can be ensured by opening a ring groove on the stator support 1. Please refer to Figure 1 and Figure 3 In some embodiments, the stator can further include at least one retaining frame 6 arranged along the radial direction of the concentric circular structure, each conductive ring is detachably connected with the retaining frame 6, and the retaining frame 6 is made of insulating material. That is, the spacing of the conductive rings is ensured by the retaining frame 6, and the retaining frame 6 can be a cover plate having a plurality of concentric ring grooves. In this embodiment, the retaining frame 6 is a plurality of strip-shaped retaining frames 6, and a plurality of grooves for the conductive rings to pass through are opened on the surface of the retaining frame 6. The plurality of grooves are distributed along the length direction of the retaining frame 6. By arranging the strip-shaped retaining frame 6, the welding points on the conductive rings can be avoided, interference can be avoided, and the retaining frame 6 can firmly fix the conductive rings on the stator support 1.

[0042] For example, the retaining frame 6 can be fixed to the stator support 1 by ultrasonic welding. Obviously, the retaining frame 6 can also be fixed to the stator support 1 by other fixing methods, for example, please refer to Figure 1 and Figure 3The stator further comprises a fixing device for fixing the holder 6 on the stator support 1, the fixing device comprises a plurality of screws 8, a plurality of third holes are distributed along the length direction of the holder 6, one end of each screw 8 is screwed to the stator support 1 through the third hole, and it can be understood that the third hole is arranged in the recess. The holder 6 is fixed on the stator support 1 through the screws 8, the connection is more convenient and detachable, and maintenance is facilitated.

[0043] In some embodiments, referring to Figure 1 and Figure 2 The shaft 7 of the stator has a hollow cavity, and the conductive wire 10 of each phase winding coil is fixedly connected with the corresponding conductive ring after being drawn out of the cavity. Thus, the conductive wire 10 is drawn out of the cavity and connected with the external power supply, avoiding interference between the conductive wire 10 and the rotor, and being safer.

[0044] The present application also aims to provide an outer rotor motor, wherein the stator of the outer rotor motor is the above-mentioned stator, and the outer rotor motor has the same beneficial effects as the above-mentioned stator, which will not be repeated here. It can be understood that the other structures of the outer rotor motor except the stator can be realized by the prior art, which will not be repeated here.

[0045] The present application also aims to provide a stator winding fixing method, comprising the following steps:

[0046] Fixing the shaft 7 and the coil-wound stator laminations 3 to the stator support 1;

[0047] Passing the wire tail of each coil through the first hole 9 of the first conductive ring 4 and welding the wire tail of the wire head to the first conductive ring 4;

[0048] Passing the wire head of each coil through the first hole 9 of the corresponding second conductive ring 5, respectively, and welding the wire head of each coil to the corresponding second conductive ring 5, respectively;

[0049] In the radial direction of the stator support 1, the corresponding conductive ring is sequentially pushed to the assembly surface of the stator support 1 in the order from inside to outside, and the first conductive ring 4 and the second conductive ring 5 are fixed to the stator support 1 through the holder 6 and the screw 8;

[0050] Wherein, before welding the wire head or the wire tail of each coil, the wire tail and the wire head of the coil are first insulated and protected; or, after welding the wire head or the wire tail of each coil, high-temperature insulating tape is wound on the surface of the first conductive ring 4 and the plurality of second conductive rings 5.

[0051] Specifically, first, as shown in the stator winding diagram of Figure 4 Three-phase parallel winding coils are wound on the stator laminations 3, and the winding coils have wire heads with sufficient length reserved for subsequent wiring;

[0052] As shown in Figure 2As shown, after the stator coil 2 is wound, the wound stator coil 2 is bonded with the stator support 1 and the shaft 7; for the convenience of assembly, the stator support 1 and the shaft 7 can be bonded before the stator coil 2 is bonded;

[0053] In order to avoid short circuit, the wire ends of each winding coil are first insulated before welding, and then the wire ends of each winding coil are welded to the first conductive ring 4 and the second conductive ring 5 according to the stator winding diagram shown in the figure. Figure 4 As shown, the wire ends X, Y and Z of the winding coils of the A phase, B phase and C phase are welded to the first conductive ring 4, and the wire heads of the winding coils of the A phase, B phase and C phase are respectively welded to the second conductive rings 5, i.e. Figure 4 As shown, the wire ends X, Y and Z of the winding coils of the A phase, B phase and C phase are welded to the first conductive ring 4, and the wire heads of the winding coils of the A phase, B phase and C phase are respectively welded to the second conductive rings 5, i.e. Figure 4 As shown, the wire ends X, Y and Z of the winding coils of the A phase, B phase and C phase are welded to the first conductive ring 4, and the wire heads of the winding coils of the A phase, B phase and C phase are respectively welded to the second conductive rings 5, i.e.

[0054] In order to ensure reliable insulation and avoid the falling of the welding points, high-temperature insulation tape such as Teflon insulation tape can be wound on the surface of the first conductive ring 4 and the second conductive ring 5 after the welding is completed for insulation protection; then the second conductive rings 5 and the first conductive ring 4 are sequentially pushed to the assembly surface of the stator support 1 from the inside to the outside, and finally the first conductive ring 4 and the second conductive ring 5 are fixed to the stator support 1 through the retainer 6 and the screw 8.

[0055] In the description of the present specification, the description of the terms "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments / ways or examples. In addition, a person skilled in the art can combine and combine the different embodiments / ways or examples described in the present specification and the features of the different embodiments / ways or examples without contradiction.

[0056] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0057] Those skilled in the art should understand that the above-mentioned embodiments are only intended to clearly illustrate the present application, and are not intended to limit the scope of the present application. Other changes or modifications can be made on the basis of the above disclosure, and these changes or modifications are still within the scope of the present application.

Claims

1. A stator characterized by, The stator for an outer rotor motor comprises a stator support and a plurality of stator coils distributed circumferentially along the stator support, each of the stator coils comprising a stator lamination and a coil wound on the stator lamination; Each of the stator coils is a plurality of parallel stator coils, and each of the stator coils is a multi-phase winding coil; The stator further comprises a conductive part, the number of phases of the multi-phase winding coil is N, and the conductive part comprises a first conductive ring and N second conductive rings; The wire tail of each phase winding coil is electrically connected to the first conductive ring; The wire head of each phase winding coil is electrically connected to the corresponding second conductive ring respectively; The first conductive ring and each of the second conductive rings are a plurality of annular electrodes arranged at intervals; The first conductive ring and each of the second conductive rings are concentric circular structures, and the first conductive ring is arranged at the outermost side of the concentric circular structures; The second conductive ring at the innermost side of the concentric circular structures has a second hole for the shaft of the stator to pass through; The stator further comprises at least one retaining frame arranged along the radial direction of the concentric circular structures, each of the conductive rings is detachably connected to the retaining frame, and the retaining frame is made of insulating material; Each of the first conductive ring and the second conductive ring is a plate-shaped ring, and each plate-shaped ring has a first hole for the wire of the corresponding phase winding coil to pass through; The wire of each phase winding coil passes through the corresponding first hole and is wound on the conductive ring, and the wire is welded to the corresponding conductive ring.

2. The stator of claim 1, wherein The stator further comprises a fixing device for fixing the retaining frame to the stator support; The fixing device comprises a plurality of screws, a plurality of third holes are distributed along the length direction of the retaining frame, and one end of each of the screws is screwed to the stator support through the third hole.

3. The stator of claim 1, wherein The shaft of the stator has a hollow cavity, and the wire of each phase winding coil is fixedly connected to the corresponding conductive ring after passing out of the cavity.

4. An external rotor electric motor characterized by The stator of the outer rotor motor is the stator of any one of claims 1 to 3.

5. A method of fixing a stator winding of a stator, characterized by, The stator is the stator of any one of claims 1 to 3; The method comprises the following steps: Fixing the shaft and the stator lamination wound with the coil to the stator support; Passing the wire tail of each coil through the first hole of the first conductive ring, and welding the wire tail of the wire head to the first conductive ring; Passing the wire head of each coil through the first hole of the corresponding second conductive ring respectively, and welding the wire head of each coil to the corresponding second conductive ring respectively; In the radial direction of the stator support, sequentially push the corresponding conductive ring to the assembly surface of the stator support in the order from inside to outside, and fix the first conductive ring and the second conductive ring to the stator support through the retaining frame and the screw; Before welding the wire head or the wire tail of each coil, insulate and protect the wire tail and the wire head of the coil; or, after welding the wire head or the wire tail of each coil, wrap high-temperature insulating tape on the surface of the first conductive ring and the plurality of second conductive rings.

Images