Stator assembly and external rotor motor using same

Abstract

The utility model discloses a stator assembly and an external rotor motor applying the same, the stator assembly comprises a stator iron core and a circuit board, two ends of the stator iron core are provided with end insulators, coil windings are wound outside the end insulators, the circuit board is installed on one of the end insulators, the edge of the circuit board is provided with three guide grooves, and the coil windings are wound outside the guide grooves. The width of the guide groove is gradually reduced from the groove opening to the groove bottom, a bayonet is formed in the groove bottom of the guide groove and connected with a wire end fixing groove, a metal connecting part is arranged on the periphery or the inner wall of the wire end fixing groove and connected with a control circuit, and an enameled wire end of the coil winding is fixed in the wire end fixing groove and electrically connected with the metal connecting part. The width H1 of the bayonet satisfies 0.8 D1 < = H1 < D2, D1 is the outer diameter of the enameled wire conductor, and D2 is the outer diameter of the enameled wire. The wire end of the enameled wire directly extends into the wire end fixing groove and is electrically connected with the metal connecting part, two-time welding is not needed, the production time and manpower resources are reduced, and the quality of electric connection is high.

Description

Technical Field

[0001] The utility model relates to a stator assembly and an outer rotor motor using the same. Background Art

[0002] In existing external rotor motors, the stator assembly includes a stator core, end insulation, coil windings, and a circuit board. The end insulation is mounted at each end of the stator core, the coil windings are wound around the tooth insulation of the end insulation, and the circuit board is mounted on one of the end insulations. The coil windings are wound with enameled wire, and the ends of the enameled wire are electrically connected to the control circuit on the circuit board. The enameled wire ends are connected to the circuit board by soldering the enameled wire ends to the metal pins fixed to the end insulation. The other end of the pin is then passed through the pads on the circuit board and soldered to the pads. This connection method has the following disadvantages: 1. The metal pins must be installed on the end insulation, increasing material costs and installation steps; 2. The two welding steps (from the enameled wire end to the metal pins, and from the metal pins to the circuit board pads) increase the production process and require corresponding equipment, personnel, and soldering materials. The additional two welding steps also increase the probability of poor solder joints; 3. The two welding steps cause the stator ends to be too high. Utility Model Content

[0003] The utility model provides a stator assembly and an outer rotor motor using the same, which are used to solve the problem in the prior art that the connection between the enameled wire end and the circuit board requires two welding operations.

[0004] The technical solution of the present utility model is achieved as follows:

[0005] A first object of the present utility model is to provide a stator assembly, comprising a stator core and a circuit board, wherein end insulation is provided at both ends of the stator core, a coil winding is wound around the end insulation, and the circuit board is mounted on one of the end insulations, and is characterized in that: three guide grooves are provided at the edge of the circuit board, the width of the guide grooves gradually narrows from the groove opening to the groove bottom, a bayonet is provided at the groove bottom of the guide groove, the bayonet is connected to a wire end fixing groove, a metal connecting portion is provided on the outer periphery or inner wall of the wire end fixing groove, the metal connecting portion is connected to the control circuit, the enameled wire end of the coil winding is fixed in the wire end fixing groove and electrically connected to the metal connecting portion, and the width H1 of the bayonet satisfies 0.8D1≤H1<D2, wherein D1 is the outer diameter of the enameled wire conductor, and D2 is the outer diameter of the enameled wire.

[0006] The slot width H2 of the guide slot mentioned above satisfies H2>2D2.

[0007] The wire end fixing groove is circular, and the metal connecting portion is a welding pad arranged on the periphery of the wire end fixing groove, and the enameled wire end is welded to the welding pad.

[0008] The diameter D2 of the thread end fixing groove satisfies D2<D3.

[0009] The above-mentioned metal connecting part is arranged on the inner wall of the wire end fixing groove. The left and right inner walls of the wire end fixing groove are parallel to each other. Part of the insulating paint of the enameled wire end is stripped to expose part of the enameled wire conductor. The exposed part of the conductor is in full contact with the metal connecting part to form an electrical connection.

[0010] The width W1 of the exposed conductor portion of the enameled wire and the height T of the metal connection portion satisfy the following relationship: 2T·W1>3.14×(D1 / 2) 2 , and W1<D1.

[0011] The insulating tooth portion with the above-mentioned end insulation is axially protruded with a wiring transition column, the circuit board is located above the wiring transition column, and the enameled wire end of the coil winding is wound around the wiring transition column and fixed in the wire end fixing groove.

[0012] The insulating yoke with the insulated end portion is axially protruded and buckled, and the buckle is buckled on the inner circle edge of the circuit board to fix the circuit board.

[0013] The inner circle of the circuit board is provided with a slot corresponding to the buckle, and the buckle is buckled in the slot to fix the circuit board.

[0014] The second object of the present utility model is to provide an outer rotor motor, comprising a stator assembly, characterized in that the stator assembly is the stator assembly described above.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The stator assembly comprises a stator core and a circuit board. End insulation is provided at both ends of the stator core, and a coil winding is wound around the end insulation. The circuit board is mounted on one of the end insulations. The edge of the circuit board is provided with three guide slots, the width of which gradually narrows from the slot opening to the slot bottom. A clip is provided at the slot bottom, connected to a wire end fixing slot. A metal connector is provided on the outer or inner wall of the wire end fixing slot, which is connected to a control circuit. The enameled wire end of the coil winding is fixed within the wire end fixing slot and electrically connected to the metal connector. The clip width H1 satisfies 0.8D1≤H1<D2, where D1 is the outer diameter of the enameled wire conductor and D2 is the outer diameter of the enameled wire. The enameled wire end directly extends into the wire end fixing slot and is electrically connected to the metal connector, eliminating the need for two welding operations, reducing production time and manpower. The sidewalls of the clip automatically scrape off the enameled wire coating as the enameled wire end passes through the clip, preventing the enameled wire end from slipping out of the wire end fixing slot after insertion, thereby ensuring the quality of subsequent electrical connections.

[0017] 2. Other advantages of the present invention are described in detail in the embodiment section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a stator assembly provided in Example 1 of the present utility model;

[0019] Figure 2 An exploded view of the stator assembly provided in Example 1;

[0020] Figure 3 This is a schematic structural diagram of the circuit board in the stator assembly provided in Example 1;

[0021] Figure 4 for Figure 3 A magnified view of point A;

[0022] Figure 5 A schematic structural diagram of the second embodiment of the present invention;

[0023] Figure 6 A schematic structural diagram of a circuit board in a stator assembly provided in Example 2;

[0024] Figure 7 A top view of the circuit board in the stator assembly provided in Example 2;

[0025] Figure 8 A side view of an enameled wire end in the stator assembly provided in Example 2;

[0026] Figure 9 This is a top view of the enameled wire end in the stator assembly provided in Example 2. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1:

[0029] like Figures 1 to 4As shown, this embodiment provides a stator assembly, including a stator core 3 and a circuit board 1, with end insulation 2 provided at both ends of the stator core 3, and a coil winding wound around the end insulation 2, and the circuit board 1 is installed on one of the end insulations 2, characterized in that: three guide grooves 11 are provided on the edge of the circuit board 1, and the width of the guide groove 11 gradually narrows from the groove opening 111 to the groove bottom, and the groove bottom of the guide groove 11 is provided with a bayonet 112, which is connected to a wire end fixing groove 12, and a metal connecting portion 13 is provided on the outer periphery or inner wall of the wire end fixing groove 12, and the metal connecting portion 13 is connected to the control circuit, and the enameled wire end 4 of the coil winding is fixed in the wire end fixing groove 12 and electrically connected to the metal connecting portion 13, and the width H1 of the bayonet 112 satisfies 0.8D1≤H1<D2, where D1 is the outer diameter of the enameled wire conductor 42, and D2 is the outer diameter of the enameled wire including the paint coating.

[0030] In the stator assembly, the enameled wire end 4 is directly inserted into the wire end fixing groove 12 and electrically connected to the metal connecting part 13, without the need for two welding operations, thereby reducing production time and human resources. When the enameled wire end 4 passes through the bayonet 112, the side wall of the bayonet 112 automatically scrapes off the paint coating of the enameled wire, while also preventing the enameled wire end from slipping out after entering the wire end fixing groove 12, thereby ensuring the quality of subsequent electrical connections.

[0031] The width H2 of the slot 111 of the guide slot 11 satisfies H2>2D2, which facilitates guiding the enameled wire end into the wire end fixing slot 12.

[0032] The wire end fixing groove 12 is circular, and the metal connecting portion 13 is a welding pad arranged on the periphery of the wire end fixing groove 12. The enameled wire end 4 is welded to the welding pad, which makes the connection convenient and reliable.

[0033] The diameter D3 of the wire end fixing groove 12 satisfies D2<D3, so that there is enough clearance between the enameled wire end 4 and the soldering pad, which is conducive to solder penetration.

[0034] A terminal transition post 23 protrudes axially from the insulating teeth 21 of the end insulator 2. The circuit board 1 is positioned above the terminal transition post 23. The coil winding enameled wire ends 4 are wound around the terminal transition post 23 and secured within the wire end securing groove 12. The terminal transition post 23 facilitates securing the ends of thinner enameled wire before packaging on the circuit board.

[0035] If the diameter of the enameled wire is thicker, the enameled wire end 4 can be directly inserted into the guide groove 11 and the wire end fixing groove 12.

[0036] The insulating yoke 22 of the end insulation 2 has an axially protruding buckle 24, which is buckled on the inner edge of the circuit board 1 to fix the circuit board 1. The circuit board can be installed conveniently and securely.

[0037] The inner circle of the circuit board 1 is provided with a slot 14 corresponding to the buckle 24 , and the buckle 24 is buckled in the slot 14 to fix the circuit board 1 .

[0038] Example 2:

[0039] like Figures 5 to 9 As shown, this embodiment provides a stator assembly similar to the stator assembly described in the first embodiment, except that:

[0040] The metal connector 13 is located on the inner wall of the wire end retaining groove 12. The left and right inner walls of the wire end retaining groove 12 are parallel to each other. The enameled wire end 4 is partially stripped of its insulating varnish, exposing a portion of the enameled wire conductor 42. The exposed conductor portion 41 makes full contact with the metal connector 13 to form an electrical connection. This direct electrical connection eliminates the need for soldering, making production more convenient.

[0041] In order to ensure the quality of the electrical connection between the enameled wire and the circuit board, the width W1 of the conductor exposed portion 41 of the enameled wire end 4 and the height T of the metal connecting portion 13 meet the requirements.

[0042] 2T·W1>3.14×(D1 / 2) 2 , and W1<D1.

[0043] The width W1 of the exposed conductor portion 41 is affected by the width W2 of the wire end fixing groove 12 and the diameter D1 of the enameled wire conductor 42 , and should be designed to match the above two parameters according to the diameter D1 of the enameled wire conductor 42 .

[0044] Example 3:

[0045] This embodiment provides an outer rotor motor, including a stator assembly 100 , characterized in that the stator assembly 100 is the stator assembly described in the first or second embodiment.

[0046] By improving the connection method between the enameled wire ends 4 of the coil winding in the stator assembly and the circuit board 1, the production of the outer rotor motor is made more efficient and the operation is more stable.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A stator assembly comprising a stator core (3) and a circuit board (1), wherein both ends of the stator core (3) are provided with end insulations (2), the end insulations (2) are wound with coil windings, and the circuit board (1) is mounted on one of the end insulations (2), characterized in that: The edge of the circuit board (1) is provided with three guide grooves (11), the width of the guide groove (11) gradually narrows from the groove opening (111) to the groove bottom, the groove bottom of the guide groove (11) is provided with a bayonet (112), the bayonet (112) is connected to a wire head fixing groove (12), the outer periphery or inner wall of the wire head fixing groove (12) is provided with a metal connecting portion (13), the metal connecting portion (13) is connected to the control circuit, the enameled wire end (4) of the coil winding is fixed in the wire head fixing groove (12) and is electrically connected to the metal connecting portion (13), the width H1 of the bayonet (112) satisfies 0.8D1≤H1<D2, wherein D1 is the outer diameter of the enameled wire conductor (42), and D2 is the outer diameter of the enameled wire.

2. A stator assembly according to claim 1, characterized in that: The width H2 of the notch (111) of the guide groove (11) satisfies H2>2D2.

3. A stator assembly according to claim 2, characterized in that: The wire end fixing groove (12) is circular, and the metal connecting portion (13) is a welding pad arranged on the periphery of the wire end fixing groove (12), and the enameled wire end (4) is welded to the welding pad.

4. A stator assembly according to claim 3, characterized in that: The diameter D3 of the thread end fixing groove (12) satisfies D2<D3.

5. The stator assembly according to claim 2, characterized in that: The metal connecting portion (13) is arranged on the inner wall of the wire end fixing groove (12), and the left and right inner walls of the wire end fixing groove (12) are parallel to each other. The enameled wire end (4) is partially stripped of insulating paint to expose a portion of the enameled wire conductor (42), and the exposed conductor portion (41) is in full contact with the metal connecting portion (13) to form an electrical connection.

6. A stator assembly according to claim 5, characterized in that: The width W1 of the conductor exposed portion (41) of the enameled wire end (4) and the height T of the metal connecting portion (13) satisfy the relationship 2T·W1>3.14×(D1 / 2) 2 And W1<D1.

7. A stator assembly according to any one of claims 1 to 6, characterized in that: A wiring transition column (23) is axially protruded from the insulating tooth portion (21) of the end insulation (2); the circuit board (1) is located above the wiring transition column (23); and the enameled wire end (4) of the coil winding is wound around the wiring transition column (23) and then fixed in the wire end fixing groove (12).

8. A stator assembly according to claim 7, characterized in that: The insulating yoke (22) of the end insulation (2) has an axially protruding buckle (24), and the buckle (24) is buckled on the inner circle edge of the circuit board (1) to fix the circuit board (1).

9. The stator assembly according to claim 8, characterized in that: The inner ring of the circuit board (1) is provided with a clamping groove (14) corresponding to the clamping buckle (24), and the clamping buckle (24) is buckled in the clamping groove (14) to fix the circuit board (1).

10. An outer rotor motor, comprising a stator assembly (100), characterized in that: The stator assembly (100) is the stator assembly according to any one of claims 1 to 9.

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