An easy-to-assemble brushless DC motor

Abstract

This utility model discloses an easy-to-assemble brushless DC motor, relating to the field of brushless DC motor technology. It includes a stator, a wire frame assembly, and a circuit board. The circuit board is assembled with the stator via the wire frame assembly. The wire frame assembly includes a wire frame body, positioning posts, L-shaped slots, W-shaped springs, L-shaped docking cylinders, and press-fit pole pieces. This utility model, by setting up a wire frame assembly with L-shaped docking cylinders, allows the vertical portion of the L-shaped docking cylinders to pass through the wiring holes. A riveting tool is used to press the press-fit pole pieces, causing multiple press-fit pole pieces to bend outwards and tightly adhere to the electrical pins on the upper surface of a ring-shaped substrate. This not only achieves electrical connection between the winding terminals and the ring-shaped substrate, but also provides pressure on the ring-shaped substrate from the bent press-fit pole pieces. When disassembly of the circuit board is required, simply pry up the press-fit pole pieces with a tool to release the pressure on the ring-shaped substrate, allowing the circuit board to be easily removed. The operation is simple and convenient.

Description

Technical Field

[0001] This utility model relates to the field of brushless DC motor technology, specifically a brushless DC motor that is easy to assemble. Background Technology

[0002] A brushless DC motor mainly consists of the following parts: Stator: This is the armature of the motor. It has slots on it. The number of slots is an integer multiple of the number of rotor poles and phases. Symmetrical multi-phase windings are wound in the stator core. The number of winding phases is generally three or four, but can also be two or five. They can be connected in star or delta configuration. Each phase winding is connected to the respective switching transistors in the inverter.

[0003] Rotor: The main part is a permanent magnet with a certain number of magnetic pole pairs, made of permanent magnet material. Its function is to establish a magnetic field in the air gap of the motor. There are two types of rotor structures: salient pole type and embedded type.

[0004] The motor control section includes phase detection, commutation elements, and a brushless motor controller. The rotor position sensor is used to detect the position of the rotor magnetic poles relative to the stator armature winding axis, providing commutation information for the inverter circuit.

[0005] When assembling existing brushless DC motors, plastic wire frames are pre-attached to both ends of the stator. The plastic wire frames have positioning posts for positioning the circuit board and clips for engaging the circuit board. The circuit board has positioning holes and slots that match the positioning posts and clips. At the same time, the winding ends of the stator pass through the wiring holes on the circuit board and are electrically connected to the circuit board by welding. This installation method is simple and convenient to operate.

[0006] However, when the circuit board needs to be replaced, it is not easy to separate it from the winding ends and clips of the stator, which makes maintenance inconvenient. Based on this, a brushless DC motor that is easy to assemble is provided. Utility Model Content

[0007] The purpose of this invention is to provide a brushless DC motor that is easy to assemble, in order to solve the problems mentioned above.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a brushless DC motor that is easy to assemble, comprising a stator, a wire frame assembly, and a circuit board, wherein the circuit board comprises an annular substrate, positioning holes, and wiring holes, wherein the positioning holes and wiring holes completely penetrate the upper and lower ends of the annular substrate;

[0009] The circuit board is assembled with the stator through a wire frame assembly, which includes a wire frame body, a positioning post, an L-shaped slot, a W-shaped spring, an L-shaped docking cylinder post, and a press-fit electrode plate.

[0010] The main body of the wire frame is symmetrically sleeved on the upper and lower ends of the stator, the positioning post is fixed to the top of the main body of the wire frame, and the annular base plate is snapped into the positioning post through the positioning hole to achieve positioning and docking with the main body of the wire frame.

[0011] The L-shaped slot is located on the outside of the wire frame body near the top. The L-shaped docking cylinder is fixed to the top of the W-shaped spring piece, and the W-shaped spring piece is engaged with the inside of the L-shaped slot to realize the assembly of the L-shaped docking cylinder and the wire frame body.

[0012] The press-fit electrode is formed on the top of the L-shaped docking cylinder. The L-shaped docking cylinder passes through the wiring hole and the press-fit electrode is riveted by external tools to make the press-fit electrode bend and fit tightly against the upper surface of the annular substrate, so as to realize the fixed composition of the annular substrate and the stator.

[0013] As a further embodiment of this utility model: the number of positioning posts and positioning holes is multiple and the same, and the multiple positioning posts and positioning holes are evenly distributed along the circumferential direction.

[0014] As a further embodiment of this utility model: the L-shaped docking cylinder has a hollow internal structure and the upper and lower ends of the vertical part are open structures. The winding end of the stator is inserted into the horizontal part of the L-shaped docking cylinder and fixed by welding. The L-shaped docking cylinder is used to realize the electrical connection between the stator winding and the annular substrate.

[0015] As a further improvement of this utility model: the number of L-shaped slots is the same as the number of windings on the stator, the W-shaped spring, L-shaped docking cylinder, and press-fit pole piece are set according to the number of winding terminals, and the number and position of the wiring holes correspond one-to-one with the number and position of the winding terminals.

[0016] As a further improvement of this utility model: the main body of the wire frame, the positioning column, and the L-shaped slot are all manufactured by injection molding, and the W-shaped spring, the L-shaped docking cylinder, and the press-fit electrode are made of metal.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] By setting up a wire frame assembly with L-shaped docking cylinders, the vertical part of the L-shaped docking cylinders passes through the wiring holes, and the press-fitted electrodes are pressed in place using a riveting tool. This causes multiple press-fitted electrodes to bend outwards and fit tightly against the electrical pins on the upper surface of the annular substrate. This not only achieves electrical connection between the winding terminals and the annular substrate, but also creates a pressing effect on the annular substrate by the bent press-fitted electrodes. When it is necessary to disassemble the circuit board, it is only necessary to use a tool to pry up the press-fitted electrodes, thereby releasing the pressing effect on the annular substrate, and the circuit board can be easily removed. The operation is simple and convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram showing the disassembled parts of this utility model;

[0021] Figure 3 This is a structural cross-sectional view of the wireframe assembly of this utility model;

[0022] Figure 4 This is a cross-sectional exploded view of the wire frame assembly of this utility model.

[0023] In the diagram: 1. Stator; 2. Wire frame assembly; 201. Wire frame body; 202. Positioning post; 203. L-shaped slot; 204. W-shaped spring; 205. L-shaped docking cylinder post; 206. Press-fit electrode plate; 3. Circuit board; 301. Annular substrate; 302. Positioning hole; 303. Wiring hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-4 In this embodiment of the utility model, a brushless DC motor that is easy to assemble includes a stator 1, a wire frame assembly 2, and a circuit board 3. The circuit board 3 includes an annular substrate 301, a positioning hole 302, and a wiring hole 303. The positioning hole 302 and the wiring hole 303 completely penetrate the upper and lower ends of the annular substrate 301.

[0026] The circuit board 3 is assembled with the stator 1 through the wire frame assembly 2. The wire frame assembly 2 includes a wire frame body 201, a positioning post 202, an L-shaped slot 203, a W-shaped spring 204, an L-shaped docking cylinder post 205, and a press-fit electrode 206.

[0027] The main body 201 of the wire frame is symmetrically sleeved on the upper and lower ends of the stator 1. The positioning post 202 is fixed on the top end of the main body 201 of the wire frame. The annular base plate 301 is snapped into the positioning post 202 through the positioning hole 302 to achieve positioning docking with the main body 201 of the wire frame.

[0028] L-shaped slot 203 is provided on the outside of the wire frame body 201 near the top. L-shaped docking cylinder 205 is fixed to the top of W-shaped spring piece 204. W-shaped spring piece 204 is engaged with the inside of L-shaped slot 203 to realize the assembly of L-shaped docking cylinder 205 and wire frame body 201.

[0029] The press-fit electrode 206 is formed on the top of the L-shaped docking cylinder 205. The L-shaped docking cylinder 205 passes through the wiring hole 303 and the press-fit electrode 206 is riveted by external tools so that the press-fit electrode 206 is bent and tightly attached to the upper surface of the annular substrate 301, so as to realize the fixed composition of the annular substrate 301 and the stator 1.

[0030] The number of positioning pins 202 and positioning holes 302 is set to be multiple and the same, and the multiple positioning pins 202 and positioning holes 302 are evenly distributed along the circumferential direction;

[0031] The L-shaped docking cylinder 205 has a hollow internal structure and the upper and lower ends of the vertical part are open. The winding end of the stator 1 is inserted into the horizontal part of the L-shaped docking cylinder 205 and fixed by welding. The L-shaped docking cylinder 205 is used to realize the electrical connection between the winding of the stator 1 and the annular substrate 301.

[0032] The number of L-shaped slots 203 is the same as the number of windings on stator 1. The W-shaped spring 204, L-shaped docking cylinder 205, and press-fit pole piece 206 are set according to the number of winding terminals. The number and position of the wiring holes 303 correspond one-to-one with the number and position of the winding terminals.

[0033] In this embodiment, it should be noted that the shape and structure of the main body 201 of the wire frame are the same as those of the common stator wire frame structures on the market. Their docking structure and functions are the same. Therefore, its structural shape will not be described in detail here.

[0034] When the stator 1 is being wound, the two wire frame bodies 201 are first sleeved onto the upper and lower ends of the stator 1 respectively. It should be noted that the L-shaped docking cylinder 205 is not installed at this time.

[0035] After the winding is completed, L-shaped docking cylinder 205 is installed at the corresponding L-shaped slot 203 position according to the position of the winding terminal. The W-shaped spring 204 is first squeezed and contracted, so that the contracted W-shaped spring 204 is inserted into the opening of the L-shaped slot 203. Then the squeezing of the W-shaped spring 204 is released, and the W-shaped spring 204 resets and locks into the inside of the L-shaped slot 203 under its own elastic force. In this way, the assembly of L-shaped docking cylinder 205 and wire frame body 201 is completed.

[0036] Next, the winding terminals are inserted into the inner side of the horizontal part of the L-shaped docking cylinder 205 and fixed by soldering. After the winding terminals are connected to the L-shaped docking cylinder 205, the circuit board 3 and the stator 1 can be assembled. The positioning hole 302 on the annular substrate 301 is aligned with the positioning post 202 and sleeved. This not only realizes the positioning of the annular substrate 301, but also realizes the automatic alignment of the wiring hole 303 with the vertical part of the L-shaped docking cylinder 205. When the positioning hole 302 and the positioning post 202 are sleeved, the vertical part of the L-shaped docking cylinder 205 passes through the wiring hole 303, and its press-fitted electrode 206 is located above the annular substrate 301.

[0037] Next, the center of multiple press-fitted electrode pieces 206 is pressed by a riveting tool, causing the multiple press-fitted electrode pieces 206 to bend outward and fit against the upper surface of the annular substrate 301 (it should be noted that the upper surface of the annular substrate 301 is provided with power-connecting pins around the wiring holes 303). The press-fitted electrode pieces 206 are tightly fitted with the power-connecting pins to realize the electrical connection between the winding terminals and the annular substrate 301. At the same time, the bent press-fitted electrode pieces 206 press against the annular substrate 301 (it should be noted that the bottom of the annular substrate 301 is supported by the wire frame body 201). In this way, the assembly and fixation of the circuit board 3 is completed.

[0038] The above structure not only enables convenient fixation of the circuit board 3, but also allows the circuit board 3 to be easily removed when it needs to be disassembled. Simply use a tool to pry up the press-fit electrode 206 to release the press-fit electrode 206 from the annular substrate 301. The operation is simple and convenient.

[0039] Please refer to this carefully. Figures 1-4 The main body of the wire frame 201, the positioning post 202, and the L-shaped slot 203 are all produced by injection molding. The W-shaped spring 204, the L-shaped docking cylinder 205, and the press-fit electrode 206 are made of metal.

[0040] In this embodiment, the overall manufacturing process of the wire frame body 201, positioning post 202, and L-shaped slot 203 is the same as that of the existing electronic wire frame, which can facilitate the improvement of production based on existing production equipment. The W-shaped spring 204, L-shaped docking cylinder post 205, and press-fit electrode 206 are made of metal, which not only have good conductivity to ensure the stable electrical connection between the winding terminal and the annular substrate 301, but also the W-shaped spring 204 has good elasticity and support force to ensure the positional stability of the L-shaped docking cylinder post 205.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A brushless DC motor that is easy to assemble, comprising a stator (1), a wire frame assembly (2), and a circuit board (3), characterized in that, The circuit board (3) includes an annular substrate (301), positioning holes (302), and wiring holes (303), wherein the positioning holes (302) and wiring holes (303) completely penetrate the upper and lower ends of the annular substrate (301); The circuit board (3) is assembled with the stator (1) through the wire frame assembly (2). The wire frame assembly (2) includes a wire frame body (201), a positioning post (202), an L-shaped slot (203), a W-shaped spring (204), an L-shaped docking cylinder post (205), and a press-fit electrode (206). The main body of the wire frame (201) is symmetrically sleeved on the upper and lower ends of the stator (1), the positioning post (202) is fixed on the top end of the main body of the wire frame (201), and the annular base plate (301) is snapped into the positioning post (202) through the positioning hole (302) to achieve positioning docking with the main body of the wire frame (201). The L-shaped slot (203) is located on the outside of the wire frame body (201) near the top. The L-shaped docking cylinder (205) is fixed to the top of the W-shaped spring piece (204). The W-shaped spring piece (204) is engaged with the inside of the L-shaped slot (203) to realize the assembly of the L-shaped docking cylinder (205) and the wire frame body (201). The press-fit electrode (206) is formed on the top of the L-shaped docking cylinder (205). The L-shaped docking cylinder (205) passes through the wiring hole (303) and the press-fit electrode (206) is riveted by external tools so that the press-fit electrode (206) is bent and tightly attached to the upper surface of the annular substrate (301) to realize the fixed composition of the annular substrate (301) and the stator (1).

2. The brushless DC motor for easy assembly according to claim 1, characterized in that, The number of positioning posts (202) and positioning holes (302) is multiple and the same, and the multiple positioning posts (202) and positioning holes (302) are evenly distributed along the circumferential direction.

3. The brushless DC motor for easy assembly according to claim 1, characterized in that, The L-shaped docking cylinder (205) has a hollow structure inside and the upper and lower ends of the vertical part are open. The winding end of the stator (1) is inserted into the horizontal part of the L-shaped docking cylinder (205) and fixed by welding. The L-shaped docking cylinder (205) is used to realize the electrical connection between the winding of the stator (1) and the annular substrate (301).

4. The brushless DC motor for easy assembly according to claim 1, characterized in that, The number of L-shaped slots (203) is the same as the number of windings on the stator (1). The W-shaped spring (204), L-shaped docking cylinder (205), and press-fit pole piece (206) are set according to the number of winding terminals. The number and position of the wiring holes (303) correspond one-to-one with the number and position of the winding terminals.

5. The brushless DC motor for easy assembly according to claim 1, characterized in that, The main body of the wire frame (201), the positioning post (202), and the L-shaped slot (203) are all manufactured by injection molding. The W-shaped spring (204), the L-shaped docking cylinder (205), and the press-fit electrode (206) are made of metal.

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