Axial yoke-free dual-rotor motor and stator bracket thereof

Abstract

The invention discloses an axial yoke-free double-rotor motor and a stator support thereof, the axial yoke-free double-rotor motor comprises a first support and a second support which are coaxially arranged, and the first support comprises a first stator ring and a plurality of first stator teeth protruding out of the outer wall of the first stator ring; the first support comprises a first stator ring and a plurality of first stator teeth protruding out of the outer wall of the first stator ring, the second support comprises a second stator ring and a plurality of second stator teeth protruding out of the outer wall of the second stator ring, the first stator ring and the second stator ring are coaxially arranged, the first stator teeth and the adjacent second stator teeth are arranged in a coplanar mode, and the first support and the second support are in sliding connection through a connecting mechanism. The stator support is of a split type structure, and installation of a winding is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular to an axial yokeless dual-rotor motor and a stator bracket thereof. Background Art

[0002] Traditional permanent magnet motors are usually radial motors or axial disc permanent magnet motors. The radial motor has a long axial length, but its power density is lower than that of the axial motor. The traditional axial flux motor has a number of stator teeth protruding from the surface between the stators, and a number of stator teeth are formed between the stator teeth for installing the iron core and winding. The integral structure between the stators is inconvenient for the installation and winding of the iron core, resulting in a complicated assembly process. On the other hand, in order to facilitate the installation of the iron core into the stator bracket and winding, the iron core and the stator bracket are mostly clearance-fitted, which easily causes axial shaking of the iron core, etc., that is, the distance between the double-sided magnet and the iron core changes, thereby causing the double-sided magnetic pull to fail, resulting in reduced motor efficiency. Summary of the Invention

[0003] The object of the present invention is to provide an axial yokeless dual-rotor motor and a stator bracket thereof, so as to overcome the deficiencies in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] An embodiment of the present application discloses a stator bracket, including a coaxially arranged first bracket and a second bracket, the first bracket including a first stator ring and a plurality of first stator teeth protruding from an outer wall of the first stator ring, the second bracket including a second stator ring and a plurality of second stator teeth protruding from an outer wall of the second stator ring, the first stator ring and the second stator ring being coaxially arranged, the first stator tooth and the adjacent second stator tooth being coplanarly arranged, and the first bracket and the second bracket being slidably connected via a connecting mechanism.

[0006] Furthermore, in the above-mentioned stator bracket, the connecting mechanism includes a plurality of guide holes provided on the first stator ring and guide pins provided on the second stator ring. The guide pins protrude from the end surface of the second stator ring close to the first bracket and are slidably inserted into the corresponding guide holes.

[0007] Furthermore, in the above-mentioned stator bracket, a plurality of first push screws abutting against the first stator ring are provided in the second stator ring, and the first push screws are connected to the second stator ring by means of threaded connection.

[0008] Furthermore, in the above-mentioned stator bracket, a plurality of first bolts connected to the first stator ring are provided in the second stator ring. The first bolts rotate through the second stator ring and are connected to the first stator ring by threaded connection.

[0009] Furthermore, in the above-mentioned stator bracket, the connecting mechanism includes an inserting tube protruding from an end surface of the second stator ring close to the first bracket, and the inserting tube is slidably inserted into the first stator ring.

[0010] Furthermore, in the above-mentioned stator bracket, the outer wall of the plug-in tube is provided with a plurality of limiting bosses, and limiting grooves are formed between adjacent limiting bosses. The end surface of the first stator ring close to the second stator ring is provided with a plug-in boss corresponding to the limiting groove.

[0011] Furthermore, in the above-mentioned stator bracket, a plurality of second jackscrews abutting against the first stator ring are provided in the second stator ring, and the second jackscrews are connected to the second stator ring by means of threaded connection.

[0012] Furthermore, in the above-mentioned stator bracket, the second stator ring is fixed to the first stator ring by second bolts or welding, and the second bolts rotate through the second stator ring and are connected to the first stator ring by threaded connection.

[0013] An embodiment of the present application also discloses an axial yokeless dual-rotor motor, comprising the above-mentioned stator bracket, windings arranged between adjacent first stator teeth and corresponding adjacent second stator teeth, and rotors rotatably arranged at both ends of the stator bracket, wherein the rotor comprises a rotor disk and a plurality of permanent magnets arranged on one end of the rotor disk close to the stator bracket, the rotor disk being rotatably connected to the corresponding first stator ring or second stator ring through a bearing, a rotor shell being connected between the two rotor disks, and a plurality of heat dissipation holes being arranged in the rotor shell.

[0014] Furthermore, in the above-mentioned axial yokeless dual-rotor motor, the winding includes an iron core and a coil wound around the iron core, pole shoes are respectively provided at both ends of the iron core close to the permanent magnet, and support bosses are respectively provided on both sides of the first stator tooth and the second stator tooth, and a support groove for supporting the pole shoe is formed between the support boss and the corresponding first stator tooth or second stator tooth.

[0015] Compared with the prior art, the advantages of the present invention are that the stator bracket is divided into a first bracket and a second bracket that are coaxially slidably arranged. When the winding is installed, the first bracket and the second bracket are close to each other, which facilitates the installation of the winding. After the winding is installed, the first bracket and the second bracket are spread apart from each other and fix the winding to prevent it from shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 FIG. 1 is a schematic structural diagram of a stator bracket in a specific embodiment of the present invention.

[0018] Figure 2 Shown is a schematic cross-sectional view of a stator bracket in a specific embodiment of the present invention.

[0019] Figure 3 FIG. 1 is a schematic structural diagram of a first bracket in a specific embodiment of the present invention.

[0020] Figure 4 FIG. 1 is a schematic structural diagram of a second bracket in a specific embodiment of the present invention.

[0021] Figure 5 Shown is an exploded schematic diagram of a stator bracket in another specific embodiment of the present invention.

[0022] Figure 6 FIG. 1 is a schematic structural diagram of a stator bracket in another specific embodiment of the present invention.

[0023] Figure 7 Shown is a structural schematic diagram of an axial yokeless dual-rotor motor in a specific embodiment of the present invention.

[0024] Figure 8 Shown is a cross-sectional schematic diagram of an axial yokeless dual-rotor motor in a specific embodiment of the present invention.

[0025] Figure 9 Shown is a schematic diagram of the assembly of a stator support and windings in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following is a detailed description of the technical solutions in the embodiments of the present invention, with reference to the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] Ginseng Figures 1 to 6 As shown, a stator bracket includes a coaxially arranged first bracket 1 and a second bracket 2. The first bracket 1 includes a first stator ring 11 and a plurality of first stator teeth 12 protruding from the outer wall of the first stator ring 11. The second bracket 2 includes a second stator ring 21 and a plurality of second stator teeth 22 protruding from the outer wall of the second stator ring 21. The first stator ring 11 and the second stator ring 21 are coaxially arranged. The first stator teeth 12 and the adjacent second stator teeth 22 are coplanar. The first bracket 1 and the second bracket 2 are slidably connected by a connecting mechanism.

[0030] In this technical solution, a split first bracket and a second bracket form a stator bracket. The first bracket and the second bracket are arranged to slide relative to each other along the axial direction. Before the winding is installed in the stator bracket, the second bracket moves closer to the first bracket to facilitate the installation and winding of the winding. After the winding is installed, the first bracket and the second bracket are spread apart (away from each other) to complete the assembly of the stator bracket and the winding.

[0031] For example, see Figures 1 to 4 As shown, the connection mechanism includes a plurality of guide holes 13 provided on the first stator ring 11 and guide pins 23 provided on the second stator ring 21 . The guide pins 23 protrude from the end surface of the second stator ring 21 close to the first bracket 1 and are slidably inserted into the corresponding guide holes 13 .

[0032] In this technical solution, the guide hole is a conventional through hole or a blind hole, and the guide pin is a conventional cylindrical pin, one end of which is embedded in the second stator ring or integrally formed with the second stator ring, and the other end is slidably inserted into the guide hole to ensure that the first bracket and the second bracket are always coaxially arranged during the process of approaching or spreading apart. The depth of the guide hole and the length of the guide pin can ensure that the corresponding end of the guide pin is always in the guide hole during the process of approaching or spreading apart the first bracket and the second bracket. In order to ensure the strength of the first bracket, the guide hole is preferably a blind hole.

[0033] For example, see Figures 1 to 4 As shown, a plurality of first jackscrews 3 abutting against the first stator ring 11 are provided in the second stator ring 21 , and the first jackscrews 3 are connected to the second stator ring 21 by means of threaded connection.

[0034] In this technical solution, after the winding is installed, the first screw is screwed in from one side of the second stator ring. After the first screw approaches the end face of the first stator ring, it continues to be screwed in to expand the distance between the first stator ring and the second stator ring until the stator bracket and the winding are relatively fixed.

[0035] For example, see Figures 1 to 4 As shown, a plurality of first bolts 4 connected to the first stator ring 11 are provided in the second stator ring 21 . The first bolts 4 rotate through the second stator ring 21 and are connected to the first stator ring 11 by threaded connection.

[0036] In this technical solution, after the top screw props apart the first stator ring and the second stator ring, the first bolt penetrates the second stator ring from one side of the second stator ring and is threadedly connected to the first stator ring, thereby fixing the first bracket and the second bracket axially to each other. The first top screw and the first bolt apply opposite forces to the first bracket, that is, the first bracket applies opposite reaction forces to the first top screw and the first bolt, thereby reducing the possibility of the first top screw and the first bolt loosening.

[0037] For example, see Figure 5 and Figure 6 As shown, the connection mechanism includes an inserting tube 24 protruding from the end surface of the second stator ring 21 close to the first bracket 1 , and the inserting tube 24 is slidably inserted into the first stator ring 11 .

[0038] In this technical solution, the plug-in tube protrudes outward along the inner wall of the second stator ring and is slidably inserted into the inner wall of the first stator ring, ensuring that the first bracket and the second bracket are always coaxially arranged during the process of approaching or expanding each other. The length of the plug-in tube can ensure that the corresponding end of the plug-in tube is always located in the inner ring of the first stator ring during the process of approaching or expanding the first bracket and the second bracket.

[0039] For example, see Figure 5 and Figure 6As shown, the outer wall of the plug-in tube 24 is provided with a plurality of limiting bosses, and limiting grooves are formed between adjacent limiting bosses. The end surface of the first stator ring 11 close to the second stator ring 21 is provided with a plug-in boss 14 corresponding to the limiting groove.

[0040] In this technical solution, the plug-in boss protrudes outward along the inner wall of the first stator ring and is slidably sleeved on the outer wall of the plug-in tube. The plug-in boss is slidably plugged into the limiting groove to ensure the relative fixation of the first bracket and the second bracket in the circumferential direction. The depth of the limiting groove and the length of the plug-in boss can ensure that the corresponding end of the plug-in boss is always in the limiting groove when the first bracket and the second bracket are approaching or spreading each other.

[0041] For example, see Figure 5 and Figure 6 As shown, a plurality of second jackscrews (not shown) abutting against the first stator ring 11 are provided in the second stator ring 21 , and the second jackscrews are connected to the second stator ring 21 by threaded connection.

[0042] For example, see Figure 5 and Figure 6 As shown, a plurality of second bolts (not shown) connected to the first stator ring 11 are provided in the second stator ring 21 . The second bolts rotate through the second stator ring 21 and are connected to the first stator ring 11 by threaded connection.

[0043] In the above two technical solutions, the functions of the second push screw and the second bolt are respectively the same as those of the first push screw and the first bolt, wherein the second bolt can be replaced by welding or other methods: that is, through size design, after the second push screw supports the first stator ring and the second stator ring, the outer end face of the second stator ring (the end face facing away from the first stator ring) is flush with the corresponding end face of the plug-in tube, and the second stator ring can also be fixed to the plug-in tube by welding or other methods.

[0044] For example, see Figures 7 to 9 As shown, an axial yokeless dual-rotor motor includes the above-mentioned stator bracket, windings arranged between adjacent first stator teeth 12 and corresponding adjacent second stator teeth 22, and rotors rotatably arranged at both ends of the stator bracket, the rotor including a rotor disk 5 and a plurality of permanent magnets 6 arranged on one end of the rotor disk 5 close to the stator bracket, the rotor disk 5 is rotatably connected to the corresponding first stator ring 11 or second stator ring 21 through a bearing 7, a rotor shell 8 is connected between the two rotor disks 5, and a plurality of heat dissipation holes are provided in the rotor shell.

[0045] In this technical solution, the first bracket and / or the second bracket are provided with a plurality of connecting holes along their radial direction for cooperating with a top screw or the like to be connected to an external connecting shaft, etc. The rotor disk is a conventional annular structure, and its inner ring is rotatably connected to the corresponding first stator ring or second stator ring through a conventional bearing, and the outer ends of the first stator ring and the second stator ring (the end close to the corresponding rotor disk) are respectively protruded with steps corresponding to the bearings, and the bearings are axially fixed by cooperating with a conventional retaining spring or the like, and an annular mounting boss is protruded from the inner wall of the outer ring of the rotor disk, and the rotor shell is mounted on the mounting boss by conventional screws or the like, and the side of the heat dissipation hole is an inclined surface. During the rotation of the rotor shell, external air enters the interior of the motor along the inclined surface of the heat dissipation hole to cool the motor, and the permanent magnet is a conventional fan-shaped permanent magnet, and is fixed to the inner wall of the rotor disk (close to the side wall of the stator bracket) by conventional means such as embedding and gluing; a space for accommodating the winding is formed between adjacent first stator teeth and between corresponding adjacent second stator teeth.

[0046] For example, see Figures 7 to 9 As shown, the winding includes an iron core 9 and a coil wound around the iron core. Pole shoes 91 are respectively provided at both ends of the iron core close to the permanent magnet. Support bosses are respectively provided on both sides of the first stator tooth 12 and the second stator tooth 22. Support grooves for supporting the pole shoes 91 are formed between the support bosses and the corresponding first stator teeth 12 or second stator teeth 22.

[0047] In this technical solution, after the winding is placed between adjacent first stator teeth and corresponding adjacent second stator teeth, the first bracket and the second bracket are opened, and the pole shoes of the iron core are fitted into the support grooves of the first stator teeth and the second stator teeth to fix the winding axially. The pole shoes are fixed radially by the friction between the pole shoes and the support grooves, which can ensure the fixing accuracy between the permanent magnet and the iron core, thereby ensuring the efficiency of the motor.

[0048] To sum up, the stator bracket is divided into a first bracket and a second bracket that are coaxially slidably arranged. When the winding is installed, the first bracket and the second bracket are close to each other to facilitate the installation of the winding. After the winding is installed, the first bracket and the second bracket are spread apart from each other and fix the winding to prevent it from shaking.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0050] The above is only a specific implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A stator bracket, characterized in that: It includes a coaxially arranged first bracket and a second bracket, the first bracket includes a first stator ring and a plurality of first stator teeth protruding from the outer wall of the first stator ring, the second bracket includes a second stator ring and a plurality of second stator teeth protruding from the outer wall of the second stator ring, the first stator ring and the second stator ring are coaxially arranged, the first stator tooth and the adjacent second stator tooth are coplanarly arranged, and the first bracket and the second bracket are slidably connected by a connecting mechanism.

2. The stator bracket according to claim 1, characterized in that: The connecting mechanism includes a plurality of guide holes provided on the first stator ring and guide pins provided on the second stator ring. The guide pins protrude from the end surface of the second stator ring close to the first bracket and are slidably inserted into the corresponding guide holes.

3. The stator bracket according to claim 2, characterized in that: A plurality of first jackscrews abutting against the first stator ring are arranged in the second stator ring, and the first jackscrews are connected to the second stator ring by means of threaded connection.

4. The stator support according to claim 2, characterized in that: A plurality of first bolts connected to the first stator ring are arranged in the second stator ring. The first bolts rotate and penetrate the second stator ring and are connected to the first stator ring by threaded connection.

5. The stator support according to claim 1, characterized in that: The connecting mechanism includes an inserting tube protruding from an end surface of the second stator ring close to the first bracket, and the inserting tube is slidably inserted into the first stator ring.

6. The stator support according to claim 5, characterized in that: The outer wall of the plug-in cylinder is provided with a plurality of limiting bosses, and limiting grooves are formed between adjacent limiting bosses. The end surface of the first stator ring close to the second stator ring is provided with a plug-in boss corresponding to the limiting groove.

7. The stator support according to claim 6, characterized in that: A plurality of second jackscrews abutting against the first stator ring are arranged in the second stator ring, and the second jackscrews are connected to the second stator ring by means of threaded connection.

8. The stator support according to claim 6, characterized in that: The second stator ring is fixed to the first stator ring by second bolts or welding. The second bolts rotate through the second stator ring and are connected to the first stator ring by threaded connection.

9. An axial yokeless dual-rotor motor, characterized in that: It comprises the stator bracket according to any one of claims 1 to 8, windings arranged between adjacent first stator teeth and between corresponding adjacent second stator teeth, and rotors rotatably arranged at both ends of the stator bracket, the rotor comprising a rotor disk and a plurality of permanent magnets arranged on one end of the rotor disk close to the stator bracket, the rotor disk being rotatably connected to the corresponding first stator ring or second stator ring through a bearing, a rotor shell being connected between the two rotor disks, and a plurality of heat dissipation holes being provided in the rotor shell.

10. The axial yokeless dual-rotor motor according to claim 9, characterized in that: The winding includes an iron core and a coil wound around the iron core. Pole shoes are respectively provided at both ends of the iron core close to the permanent magnet. Support bosses are respectively provided on both sides of the first stator tooth and the second stator tooth. Support grooves for supporting the pole shoes are formed between the support bosses and the corresponding first stator teeth or second stator teeth.

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