Small volume throttle motor

Abstract

The utility model relates to a kind of small volume throttle motor, including stator and rotor, stator with the rotor between being equipped with magnetic tile layer;Magnetic tile layer at least includes two arc magnetic tiles;Two end surfaces of magnetic tile along the circumferential direction are set into the plane parallel with the axis L of rotor, to define top holding gap between two magnetic tiles;Clamp spring is installed in top holding gap, and clamp spring is circumferentially pushed to the magnetic tile of two sides.This utility model has the beneficial effect that: using plane contact type elastic top holding structure, through the magnetic tile end surface design parallel with rotor axis, cooperate with the circumferential synchronous push of double spring leaf type clamp spring, build the magnetic tile fixing scheme without gluing;The arc-shaped bending edge of clamp spring uses flared structure design, and its outside supporting leg section and magnetic tile plane form normal top holding, cooperate with the triangular limit space formed by the inclined surface of magnetic tile outer surface and stator inner wall, so that abutting piece realizes three-dimensional positioning, improve anti-vibration stability, maintain stable top holding force output.

Description

Technical Field

[0001] This utility model relates to the field of brushed motor technology for automobiles, specifically to a small-volume throttle valve motor. Background Technology

[0002] The electronic throttle control (ETC) motor is used in automobile engines to control the opening of the intake valve body of the working cylinders. Due to the harshness of its working environment (high temperature, severe vibration), the reliability of the electronic throttle is closely related to the robustness of its components. Among the components of the electronic throttle is a tile-shaped magnet, known as a "magnetic tile," which serves to generate a constant magnetic potential source.

[0003] Currently, the magnets of electronic throttle valves are mainly fixed to the motor housing by adhesive bonding. This method is characterized by simple components but complex processes, and its reliability and consistency are greatly affected by changes in the operating environment. This is because the adhesive used for bonding must remain firmly in place within the automotive engine's operating environment of -40 to 150°C without significant changes. Furthermore, large temperature variations inevitably cause thermal expansion and contraction of the magnets and housing, leading to internal stresses that are ineffective and have negative consequences due to the limitations of adhesive bonding. In addition, the bonding process requires coating, pasting, and high-temperature curing, which is not only time-consuming (in minutes or more) but also introduces additional quality risks and environmental costs due to adhesive control and evaporation. The cost increases due to the use of specialized adhesives and the extended processing time.

[0004] Chinese utility model patent CN208522574U discloses an electronic throttle motor, which includes a stator, a rotor, and a magnetic tile layer disposed between the stator and the rotor. A stop block is formed on the inner wall of the stator. The magnetic tile layer includes two magnetic tiles that define a first gap and a second gap. By placing the stop block of the stator in the first gap of the magnetic tile layer and placing a butterfly-shaped flat spring element in the second gap of the magnetic tile layer, two adjacent straight edges of the two magnetic tiles are elastically pressed by the first and second force fulcrums of the spring element, respectively. This pushes the other two adjacent straight edges of the two magnetic tiles against and limits the stop block. The spring element can apply pressure to the magnetic tiles in the circumferential direction of the magnetic tiles, thereby achieving three-dimensional limitation of the magnetic tiles on the inner wall of the stator. This allows the two magnetic tiles to be forcefully attached and fixed to the inner wall of the stator, avoiding the technical problems caused by the use of glue or double spring clips to fix the magnetic tiles in the prior art.

[0005] However, in the aforementioned motor, the spring element's support of the magnet is configured to apply force at multiple points, and the direction of the force is uneven. Furthermore, the lack of limiting structures for the installation of the spring element itself makes it easy for the spring element to come out of the gap between the magnets, leading to spring element failure. Utility Model Content

[0006] In order to solve the above-mentioned problems in the prior art, this utility model provides a small-volume throttle motor.

[0007] The above-mentioned problems of this utility model are solved by the following technical solution: A small-volume throttle valve motor includes a stator and a rotor disposed inside the stator, wherein a magnetic tile layer is provided between the stator and the rotor; The magnetic tile layer includes at least two arc-shaped magnetic tiles; the two end faces of the magnetic tiles along the circumferential direction are set as planes parallel to the axis L of the rotor, thereby defining a top-holding gap between the two magnetic tiles; a retaining spring is installed in the top-holding gap, and the retaining spring pushes the magnetic tiles on both sides in the circumferential direction.

[0008] A further provision of the above technical solution is that the retaining ring consists of two spring sheets connected by a connecting surface in the middle; the spring sheet includes an arc-shaped bend, and the outer end of the arc-shaped bend is provided with an abutment piece, which is in surface contact with the inner wall of the stator.

[0009] A further provision of the above technical solution is that the concave surface of the arc-shaped bend faces away from the rotor; The outer support segment of the arc-shaped bend pushes against the plane of the magnetic tile.

[0010] A further feature of the above technical solution is that the arc-shaped bend is configured as a flared structure.

[0011] A further provision of the above technical solution is that: an inclined surface is provided on the outer surface of the magnetic tile, and the inclined surface is connected to the plane; at the same time, a limiting space is formed between the inclined surface and the inner wall of the stator, which can limit and accommodate the abutment piece.

[0012] A further feature of the above technical solution is that the stator is configured as a housing structure with one end open, an end cover is provided on the open side, and a V-shaped riveting angle is provided on the stator and a positioning groove on the end cover is inserted and riveted. A brush holder is provided on the inner side of the end cap, and a pin is formed on the brush holder, with the pin extending out of the end cap.

[0013] A further provision of the above technical solution is that: an inductor slot and a component slot are provided on the end face of the brush holder facing the rotor, the inductor slot and the component slot are arranged opposite to each other and are electrically connected by a conductive copper busbar; The conductive copper busbar is configured with a C-shaped structure.

[0014] A further provision of the above technical solution is that: a commutator is provided on the rotor shaft, and brushes are symmetrically arranged on two sides of the commutator. The brushes are held by an elastic element and have a tendency to move toward one side of the commutator.

[0015] A further provision of the above technical solution is that: a brush holder is radially arranged on the brush holder, and a brush groove is penetrating through the brush holder; The elastic element is a torsion spring disposed on the side of the brush holder, and the two torsion feet of the torsion spring abut against the brush holder and the brush, respectively.

[0016] A further provision of the above technical solution is that a reserved groove is provided on the end face of the brush holder facing the end cap.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. A planar contact elastic support structure is adopted to replace the traditional adhesive bonding process. Through the design of the magnetic tile end face parallel to the rotor axis, and the circumferential synchronous pushing of the double spring clip, a glue-free magnetic tile fixing solution is constructed. The arc-shaped bend of the clip adopts an flared structure design, and its outer support section forms a normal support with the magnetic tile plane. Combined with the triangular limiting space formed by the inclined surface of the outer surface of the magnetic tile and the inner wall of the stator, the abutment piece can achieve three-dimensional positioning, improve vibration resistance and stability, and maintain a stable support force output. 2. Breakthrough optimization has been achieved in spatial layout. The utilization rate of the internal space of the motor has been significantly improved through multi-dimensional structural collaborative design: The brush holder adopts a modular integrated design, with the inductor slot and component slot arranged symmetrically opposite each other. The bottom electrical connection is achieved through C-shaped conductive copper busbars. This "three-dimensional cross" layout makes the axial thickness of the brush holder controllable, saves installation space, and provides precise spatial constraints for internal components to reduce the overall volume of the motor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the exploded structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the planar structure of the magnetic tile layer.

[0020] Figure 3 This is a schematic diagram of the snap ring structure.

[0021] Figure 4 for Figure 2 Enlarged structural diagram of part A in the middle.

[0022] Figure 5 This is a schematic diagram of the brush holder structure.

[0023] Figure 6 This is a schematic diagram showing the layout of the components on the brush holder.

[0024] The attached diagram is labeled: 100, stator; 110, riveting angle; 101, slot. 200. Magnetic tile; 201. Inclined surface; 202. Straight surface; 300. Snap ring; 310. Connecting surface; 320. Spring leaf; 321. Curved edge; 322. Abutment piece; 321.1. Support leg section; 400 Brush holder; 410 Brush holder; 412 Abutment plate; 401 Reserved slot; 420 Clip protrusion; 402 Inductor slot; 403 Component slot; 411 Brush slot; 430 Torsion spring mounting post; 500, end cap; 501, positioning groove; 610. Pin; 620. Conductive copper busbar; 1. Rotor; 2. Inductor; 3. Brush; 4. Resistor; 5. Capacitor; 6. Gear; a. Limiting space; 7. Commutator; 8. Torsion spring. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0026] like Figure 1-6 As shown in the figure, this embodiment discloses a small-volume throttle motor.

[0027] It includes a stator 100 and a rotor 1 disposed inside the stator 100, wherein a magnetic tile layer is provided between the stator 100 and the rotor 1; The magnetic tile layer includes at least two arc-shaped magnetic tiles 200; the two end faces of the magnetic tiles 200 along the circumferential direction are set as planes parallel to the axis L of the rotor 1, thereby defining a top-holding gap between the two magnetic tiles 200; a retaining spring 300 is installed in the top-holding gap, and the retaining spring 300 pushes the magnetic tiles 200 on both sides in the circumferential direction.

[0028] The above is the basic scheme of this embodiment.

[0029] Specific reference Figure 1 and Figure 2As shown in the specific implementation of this embodiment, two identical, arc-shaped magnetic tiles 200 are designed and arranged symmetrically at 180 degrees within the stator 100. This symmetrical installation method creates a structurally stable support gap at each of the two end regions of each magnetic tile 200. To ensure assembly reliability, a resilient retaining spring 300 is specifically configured within each support gap.

[0030] Furthermore, in this embodiment, the two end faces of the magnetic tile 200 along the circumferential direction are machined into planar structures that are absolutely parallel to the rotation axis L of the rotor 1, and these planes are located precisely on the radial reference line of the rotor 1. When the retaining ring 300 applies a pushing force to the plane, the resulting holding force is always perpendicular to the plane. Through mechanical analysis, it can be seen that this design allows the holding force to be decomposed into a component force that clearly points outward from the rotor 1. This component force can effectively counteract interference forces in other directions, thereby ensuring that the magnetic tile 200 is always stably maintained in the predetermined position on the outer side of the rotor 1, without any displacement or loosening.

[0031] Specifically, the retaining ring 300 is composed of two spring pieces 320, which are connected by a connecting surface 310 in the middle; the spring piece 320 includes an arc-shaped bend 321, and the outer end of the arc-shaped bend 321 is provided with an abutment piece 322, which is in surface contact with the inner wall of the stator 100.

[0032] Reference Figure 2 and Figure 3 As shown, the retaining ring 300 adopts a symmetrical structural design, with two elastic spring pieces 320 symmetrically arranged at the two ends of the connecting surface 310. Each spring piece 320 has an abutment piece 322 extending outwards, which is designed as a narrow sheet. The abutment piece 322 forms a surface contact with the inner wall surface of the stator 100. This contact method effectively disperses the force and avoids localized stress concentration.

[0033] This structural design ensures good stability of the retaining ring 300 when installed inside the stator 100, preventing loosening or displacement during operation. Simultaneously, the symmetrically arranged spring plates 320 ensure uniform force distribution on the retaining ring 300, improving the overall structural reliability.

[0034] In this embodiment, the concave surface of the arc-shaped bend 321 faces away from the rotor 1; The outer support segment 321.1 of the arc-shaped bend 321 pushes against the plane of the magnetic tile 200.

[0035] In this embodiment, the connecting section is selected as a plane to support the arc-shaped bends 321 on both sides, so as to maintain the overall strength of the snap ring 300.

[0036] Specifically, in this embodiment, the curved edge 321 adopts a U-shaped structure design, with its concave side precisely facing the stator 100. This U-shaped structure consists of two symmetrical support segments 321.1, with the outer support segment 321.1 maintaining close contact with the plane of the magnetic tile 200 to form an effective counter-pushing force. The inner support segment 321.1 connects to the connecting surface 310, ensuring the stability and reliability of the structure. The U-shaped structure not only ensures structural strength but also optimizes the magnetic circuit distribution. This design allows the curved edge 321 to better transmit and disperse stress, improving the overall service life of the component.

[0037] Preferably, in this embodiment, the arc-shaped bend 321 is configured as a flared structure.

[0038] By setting the curved edge 321 to an arc structure, the structural strength of the spring 320 is further guaranteed, so as to have a more stable pushing force on the end face of the magnetic tile 200.

[0039] In this embodiment, to ensure the position of the abutment piece 322, an inclined surface 201 is provided on the outer surface of the magnetic tile 200, and the inclined surface 201 is connected to the plane; at the same time, a limiting space a is formed between the inclined surface 201 and the inner wall of the stator 100, which can limit and accommodate the abutment piece 322.

[0040] Specific reference Figure 4 As shown, in this embodiment, the inclined surface 201 is disposed on the outer surface area that connects with the plane, so that the overall width of the plane in the radial direction is significantly smaller than the actual thickness of the magnetic tile 200. In this structure, an approximately triangular limiting space a is naturally formed between the inclined surface 201 and the inner wall of the stator 100, and the abutment piece 322 is precisely placed inside this specific limiting space a.

[0041] Based on the above configuration, a certain distance is always maintained between the abutment piece 322 and the magnetic tile 200, preventing direct contact between them. Furthermore, when the abutment piece 322 is subjected to external impact or other unforeseen circumstances, the special geometry and positional relationship of the inclined surface 201 effectively restrains it, preventing it from accidentally detaching from the limiting space a. This dual protection mechanism not only ensures the stable positioning of the abutment piece 322 but, more importantly, reliably maintains the secure connection between the retaining ring 300 and the magnetic tile 200, thereby enhancing the overall structural stability and safety.

[0042] Based on the above configuration, the magnet 200 in this embodiment is shorter, thus reducing the overall length of the motor. At the same time, the thickness of the magnet 200 is reduced, freeing up space for the rotor 1, thereby reducing the overall size of the motor.

[0043] In this embodiment, the stator 100 is configured as a housing structure with one end open, and an end cover 500 is provided on the open side. The stator 100 is provided with a V-shaped riveting angle 110 and a positioning groove 501 on the end cover 500, which are then riveted together. A brush holder 400 is provided on the inner side of the end cover 500, and a pin 610 is formed on the brush holder 400, which extends to the outside of the end cover 500.

[0044] Specific reference Figure 1 As shown, the stator 100 of the motor adopts a shell-type structure design, with multiple V-shaped riveting angles 110 formed at the open end of the stator 100. These riveting angles 110 are circumferentially distributed, with their V-shaped openings facing outwards from the stator 100. During assembly, the operator needs to first precisely align the positioning groove 501 on the end cover 500 with the riveting angles 110 on the stator 100, and then pass the riveting angles 110 through the positioning groove 501 one by one. After all the riveting angles 110 are in place, a special riveting tool is used to press and deform the riveting angles 110, making them firmly snapped onto the end cover 500, thereby tightly fixing the end cover 500 to the open side of the stator 100, achieving a reliable seal of the internal cavity of the motor. At the same time, it can effectively reduce the need to add flange plates or other parts due to installation shape requirements, thus reducing the overall size.

[0045] The brush holder 400, as a key conductive component, is arranged inside the stator 100, positioned between the end cover 500 and the rotor 1. A pin 610 structure is injection-molded onto the brush holder 400. One end of the pin 610 connects to the brush holder 400, and the other end extends through a pre-drilled hole in the end cover 500, ultimately protruding outside the end cover 500. This integrated design not only ensures a reliable connection between the brush holder 400 and external circuit wires but also, through the tight fit between the pin 610 and the end cover 500, ensures the stable fixation of the brush holder 400 during motor operation, effectively preventing contact problems caused by vibration.

[0046] Furthermore, the outer circumferential edge of the brush holder 400 is evenly distributed with multiple protruding locking protrusions 420, and the inner side of the stator 100 at the corresponding position has a corresponding groove 101 that matches the shape of the locking protrusion 420. During assembly, the locking protrusions 420 of the brush holder 400 are precisely inserted into the groove 101 at the end of the stator 100. Through this convex-concave mechanical connection, the brush holder 400 is firmly installed at the open end of the stator 100. This design not only ensures the accurate positioning of the brush holder 400, but also makes the outer end face of the brush holder 400 completely flush with the end plane of the stator 100, thereby ensuring the integrity and aesthetics of the internal structure of the motor.

[0047] The brush holder 400 serves as a mounting base for internal components of the stator 100. The brush holder 400 has an inductor slot 402 and a component slot 403 on its end face facing the rotor 1. The inductor slot 402 and the component slot 403 are arranged opposite to each other and are electrically connected by a conductive copper busbar 620. The conductive copper busbar 620 is configured with a C-shaped structure.

[0048] Specific reference Figure 5 and Figure 6 As shown, in the structural design of this embodiment, the number of inductor slots 402 and component slots 403 are both arranged in an even number, which ensures the balance of the mechanical structure. These slots exhibit strict symmetry in their spatial distribution, precisely positioned on both sides of the brush holder 400 structure, forming a mirror-symmetrical arrangement. The bottom areas of the inductor slots 402 and the component slots 403 are reliably electrically connected via a specially designed conductive copper busbar 620.

[0049] Preferably, in this embodiment, four component slots 403 are provided for placing two capacitors 5 and two resistors 4.

[0050] To effectively avoid potential spatial interference with the rotating components in the center of rotor 1, the conductive copper busbar 620 is specially designed with a C-shaped bend structure with a specific curvature. This unique shape cleverly bypasses the core area of ​​the stator 100's internal space, ensuring safety during operation. In practice, the number of conductive copper busbars 620 also follows the principle of symmetry, consisting of two identical units. These two units are symmetrically distributed in space, further enhancing the stability and reliability of the entire system. This symmetrical double-copper-busbar design not only improves conductivity but also optimizes the distribution characteristics of the electromagnetic field.

[0051] Preferably, in this embodiment, the conductive copper busbar 620 and the pin 610 are integrally formed, eliminating the need for an electrical connection structure between the conductive copper busbar 620 and the pin 610. At the same time, the conductive copper busbar 620 is formed into the interior of the brush holder 400 during the forming process, and is only exposed to the bottom of the inductor groove 402 and the bottom of the component groove 403, for electrical connection with the inductor 2, capacitor 5 and resistor 4.

[0052] In this embodiment, two pins 610 are provided, namely a positive pin and a negative pin.

[0053] Based on the above configuration, the brush holder 400 adopts an insert injection molding one-piece molding. Compared with the structure of most riveted inserts, it can leave soldering points and assembly holes for configuring EMC electronic components in a limited space. Most brush holders 400 require separate space for component insertion, while this embodiment can effectively avoid customers having to consider the installation position of components due to increased EMC configuration requirements.

[0054] Furthermore, in this embodiment, a commutator 7 is provided on the shaft of the rotor 1, and brushes 3 are symmetrically arranged on the two sides of the commutator 7. The brushes 3 are held by the elastic element and have a tendency to move toward the commutator 7.

[0055] The rotor 1 structure includes a shaft that runs axially through the entire rotor 1. The shaft extends beyond the end cover 500, and a gear 6 is mounted on the extended portion. A bearing is installed at the connection point with the brush holder 400. A commutator 7 is fixedly mounted on the shaft near the brush holder 400. The commutator 7 adopts a ring structure design, and its inner hole is tightly connected to the shaft by an interference fit. Highly conductive brushes 3 are symmetrically arranged on the left and right sides of the commutator 7. This symmetrical arrangement ensures the balance of current conduction. From the overall structural layout, the brushes 3 are cleverly positioned in the transition area between the inductor slot 402 and the component slot 403. This arrangement ensures both the reliability of the electrical connection and the rational use of space. Each brush 3 is equipped with an elastic element at its outer end. This elastic element generates a continuous elastic force through a preloaded spring, which applies pressure to the brush 3 in the direction of the commutator 7 in a stable manner. This ensures that the working surface of the brush 3 and the conductive surface of the commutator 7 always maintain good contact, minimizes the contact resistance 4, and improves the current conduction efficiency.

[0056] Specifically, a brush holder 410 is radially arranged on the brush holder 400, and a brush groove 411 is passed through the brush holder 410; The elastic element is a torsion spring 8 disposed on the side of the brush holder 410, and the two torsion feet of the torsion spring 8 respectively abut against the brush holder 410 and the brush 3.

[0057] Reference Figure 5As shown, the brush holder 410 is integrally formed on the brush frame 400, and a slender brush groove 411 is precisely formed along the radial direction of the motor. The size of the brush groove 411 matches the brush 3, allowing the brush 3 to slide smoothly radially within the groove. A cylindrical torsion spring 8 mounting post 430 is specially designed on the side of the brush frame 400 so that the torsion spring 8 can be securely fitted onto it. Furthermore, an abutment plate 412 extends from the upper end of the brush frame 400, which is integrally formed with the brush holder 410. The two elastic torsional feet of the torsion spring 8 act on different parts: one torsional foot maintains stable contact with the contact surface of the abutment plate 412, while the other torsional foot continuously applies pressure to the outer end face of the brush 3. This design allows the torsion spring 8 to generate a continuous radial elastic force, thereby pushing the brush 3 to move steadily along the radial direction towards the commutator 7, ensuring optimal contact between the brush 3 and the commutator 7.

[0058] In this embodiment, a reserved groove 401 is provided on the end face of the brush holder 400 facing the end cover 500.

[0059] The pre-drilled slot 401 is a specially designed structure located on the surface of the brush holder 400 facing the end cap 500. Its main purpose is to provide a reliable connection position for subsequent welding processes. These slots can be used to fix various additional components or other functional parts, and are also suitable for welding wires or leads, ensuring the stability and reliability of electrical connections. This design not only simplifies the assembly process but also improves the compactness and aesthetics of the overall structure, while ensuring that the mechanical strength and electrical performance of the welded parts meet design requirements.

[0060] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A small-volume throttle valve motor, comprising a stator (100) and a rotor (1) disposed inside the stator (100), wherein a layer of magnetic tiles (200) is provided between the stator (100) and the rotor (1); characterized in that The magnetic tile layer includes at least two arc-shaped magnetic tiles (200); the two end faces of the magnetic tiles (200) along the circumferential direction are set as planes parallel to the axis L of the rotor (1), thereby defining a top holding gap between the two magnetic tiles (200); a retaining spring (300) is installed in the top holding gap, and the retaining spring (300) pushes the magnetic tiles (200) on both sides in the circumferential direction.

2. The small volume throttle motor of claim 1, wherein: The snap ring (300) consists of two spring pieces (320), which are connected by a connecting surface (310) in the middle. The spring piece (320) includes an arc-shaped bend (321), and the outer end of the arc-shaped bend (321) is provided with an abutment piece (322). The abutment piece (322) is in surface contact with the inner wall of the stator (100).

3. The small volume throttle motor of claim 2, wherein: The concave surface of the arc-shaped bend (321) faces away from the rotor (1); The outer support segment (321.1) of the arc-shaped bend (321) pushes against the plane of the magnetic tile (200).

4. The small volume throttle motor according to claim 2 or 3, characterized in that: The curved edge (321) is configured as a flared structure.

5. The small volume throttle motor of claim 2, wherein: An inclined surface (201) is provided on the outer surface of the magnetic tile (200), and the inclined surface (201) is connected to the plane; at the same time, a limiting space (a) is formed between the inclined surface (201) and the inner wall of the stator (100) to limit and accommodate the abutment piece (322).

6. The small volume throttle motor of claim 1, wherein: The stator (100) is configured as a shell structure with one end open, and an end cover (500) is provided on the open side. The stator (100) is provided with a V-shaped riveting angle (110) and a positioning groove (501) on the end cover (500) are inserted and riveted. A brush holder (400) is provided on the inner side of the end cap (500), and a pin (610) is formed on the brush holder (400), the pin (610) extending to the outside of the end cap (500).

7. The small volume throttle motor of claim 6, wherein: The brush holder (400) has an inductor slot (402) and a component slot (403) on the end face facing the rotor (1). The inductor slot (402) and the component slot (403) are arranged opposite to each other and are electrically connected by a conductive copper busbar (620). The conductive copper busbar (620) is configured as a C-type structure.

8. The small volume throttle motor of claim 6, wherein: A commutator (7) is provided on the shaft of the rotor (1). Brushes (3) are symmetrically arranged on the two sides of the commutator (7). The brushes (3) are supported by the elastic element and have a tendency to move toward the commutator (7).

9. The small volume throttle motor of claim 8, wherein: The brush holder (400) is radially arranged with a brush seat (410), and the brush seat (410) has a brush groove (411) passing through it; The elastic element is a torsion spring (8) disposed on the side of the brush holder (410), and the two torsion feet of the torsion spring (8) respectively abut against the brush holder (410) and the brush (3).

10. The small volume throttle motor of claim 6, wherein: A reserved groove (401) is provided on the end face of the brush holder (400) facing the end cap (500).

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