Stator assembly and external rotor motor using same

Abstract

The utility model discloses a stator assembly and an external rotor motor applying the same, and the stator assembly comprises a stator iron core, an end part insulator embedded on the stator iron core, three stator windings wound on the end part insulator, a circuit board assembly installed at one axial side of the stator iron core, and a bearing pedestal arranged in the stator iron core. One end of the bearing seat is connected with a driver shell, the driver shell covers the circuit board assembly, the bottom of the ground wire pin is fixed in a stator slot of the stator core through a slot wedge, and the top of the ground wire pin is inserted on the circuit board assembly and is conducted with a ground wire of the circuit board assembly. And two sides of the middle part of the ground wire contact pin are contacted and electrically connected with the stator groove wall surface of the stator iron core. The circuit board assembly is conducted with the stator core through the ground wire pin, so that the circuit board assembly is connected with the ground wire, the safety performance of the motor is improved, and potential safety hazards are reduced.

Description

Technical Field

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

[0002] The existing outer rotor motor includes a stator assembly and an outer rotor assembly. The stator assembly includes a stator core, an end insulation embedded in the stator core, a three-phase stator winding wound on the end insulation, a circuit board assembly installed on one side of the stator core axial direction, and a bearing seat arranged in the stator core. One end of the bearing seat is connected to a driver housing, and the driver housing is covered outside the circuit board assembly. Each of the three-phase stator windings is connected to a winding pin, and the winding pin is electrically connected to the circuit board assembly. The existing outer rotor motor is difficult to pass the EMI test because the circuit board assembly is not connected to the ground wire. The safety performance of the motor is low and there is a great safety hazard. 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 technical problems in the prior art that a circuit board assembly of the stator assembly is not connected to a ground wire, resulting in difficulty in passing an EMI test, low safety performance of the motor, and greater potential safety hazards.

[0004] The technical solution of the utility model is achieved in this way:

[0005] The first object of the utility model is to provide a stator assembly, comprising a stator core, an end insulation embedded in the stator core, a stator winding wound on the end insulation, a circuit board assembly installed on one axial side of the stator core, and a bearing seat arranged in the stator core, one end of the bearing seat is connected to a driver housing, the driver housing is covered outside the circuit board assembly, and it also includes a ground pin, the bottom of the ground pin is fixed in the stator slot of the stator core through a slot wedge, the top of the ground pin is inserted into the circuit board assembly and is electrically connected to the ground wire on the circuit board assembly, and the middle two sides of the ground pin are in contact with the stator slot wall of the stator core and are electrically connected.

[0006] The two sides of the middle part of the above-mentioned ground wire pin are in contact with the stator slot wall surface of the stator core and are electrically connected. Specifically, a cavity is provided inside the slot wedge, and avoidance grooves are provided on both sides of the outlet of the cavity. The bottom of the ground wire pin is inserted into the cavity, and blocks protrude outwardly from both sides of the middle part of the ground wire pin. The blocks are stuck in the avoidance grooves and the sides of the blocks protrude out of the avoidance grooves. The blocks are in contact with the stator slot wall surface of the stator core and are electrically connected.

[0007] The clamping block is interference-fitted with the stator slot wall surface of the stator core.

[0008] A spacer block protrudes axially from the top of the slot wedge, protruding out of the end insulation and separating the ground wire pin from the stator winding.

[0009] The width of the clamping block of the ground wire pin increases gradually from bottom to top.

[0010] The bearing seat and the stator core are injection molded together, and the bearing seat and the stator core are electrically connected and conductive.

[0011] The stator windings described above have three groups, each group is connected to a winding pin, the end of each winding pin is inserted into the circuit board assembly and is connected to the circuit of the circuit board assembly, and the winding pin and the ground wire pin are respectively located on both sides of the axial hole of the stator core.

[0012] The second object of the utility model is to provide an outer rotor motor, comprising a rotor assembly and a stator assembly, characterized in that: the stator assembly is the stator assembly described above.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The stator assembly includes a stator core, an end insulation embedded in the stator core, a stator winding wound on the end insulation, a circuit board assembly installed on one side of the stator core axially, and a bearing seat arranged in the stator core, one end of the bearing seat is connected to a driver housing, and the driver housing is covered outside the circuit board assembly, and it also includes a ground pin, the bottom of the ground pin is fixed in the stator slot of the stator core through a slot wedge, the top of the ground pin is inserted into the circuit board assembly and is electrically connected to the ground wire on the circuit board assembly, and the middle two sides of the ground pin are in contact with the stator slot wall of the stator core and are electrically connected. The circuit board assembly is connected to the stator core through the ground pin, so that the circuit board assembly is connected to the ground wire, which increases the safety performance of the motor, reduces safety hazards, and is easy to pass the EMI test.

[0015] 2. Other advantages of the present invention are described in detail in the embodiment section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a stator assembly provided in Embodiment 1 of the present utility model;

[0017] Figure 2 This is an exploded view of the stator assembly;

[0018] Figure 3 is a cross-sectional view of a stator assembly;

[0019] Figure 4 This is a schematic diagram of the structure of the stator assembly after omitting the bearing seat;

[0020] Figure 5 for Figure 4 A magnified image of point A;

[0021] Figure 6 It is a bottom view of the stator assembly after omitting the bearing seat;

[0022] Figure 7 for Figure 6 BB cross-section diagram;

[0023] Figure 8 is a schematic diagram of the structure of the slot wedge in the stator assembly;

[0024] Fig. 9 This is a schematic diagram of the structure of the ground pin in the stator assembly. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1:

[0027] like Figures 1 to 9 As shown, the present embodiment provides a stator assembly, comprising a stator core 1, an end insulation 2 embedded in the stator core 1, three groups of stator windings 3 wound on the end insulation 2, a circuit board assembly 4 installed on one axial side of the stator core 1, and a bearing seat 5 arranged in the stator core 1, one end of the bearing seat 5 is connected to a driver housing 51, and the driver housing 51 covers the outside of the circuit board assembly 4, characterized in that: it also includes a ground pin 6, the bottom of the ground pin 6 is fixed in the stator slot 11 of the stator core 1 through a slot wedge 7, the top of the ground pin 6 is inserted into the circuit board assembly 4 and is electrically connected to the ground wire on the circuit board assembly 4, and the middle of the ground pin 6 is in contact with the wall surface of the stator slot 11 of the stator core 1 and is electrically connected.

[0028] The stator assembly and the circuit board assembly are connected to the stator core through the ground wire pin, so that the circuit board assembly is connected to the ground wire. The stator assembly can pass the EMI test, and the safety performance of the motor is increased, and the potential safety hazards are reduced.

[0029] The middle two sides of the grounding pin 6 are in contact with the wall surface of the stator slot 11 of the stator core 1 and are electrically connected. Specifically, a cavity 71 is provided inside the slot wedge 7, and avoidance grooves 72 are provided on both sides of the outlet of the cavity 71. The bottom of the grounding pin 6 is inserted into the cavity 71, and a clamping block 61 protrudes outwards from both sides of the middle of the grounding pin 6. The clamping block 61 is clamped in the avoidance groove 72 and the side of the clamping block 61 protrudes outside the avoidance groove 72. The clamping block 61 is in contact with the wall surface of the stator slot 11 of the stator core 1 and is electrically connected. The grounding pin 6 has a simple structure and is easy to install. The clamping block 61 has good contact with the stator core 1 and is not easy to loosen.

[0030] The clamping block 61 is interference-fitted with the stator slot wall surface 11 of the stator core 1 , thereby further ensuring the contact between the clamping block 61 and the stator core 1 .

[0031] A spacer 73 protrudes axially from the top of the slot wedge 7, protruding from the end insulation 2 and separating the ground pin 6 from the stator winding 3. The spacer 73 can prevent the ground pin 6 from contacting and conducting with the stator winding 3, thereby enhancing the insulation effect and ensuring the reliability of the stator assembly.

[0032] The width L of the block 61 of the ground wire pin 6 increases gradually from bottom to top, so as to facilitate the ground wire pin to be inserted into the stator slot 11 .

[0033] The bearing seat 5 is injection molded together with the stator core 1, and the bearing seat 5 is electrically connected to the stator core 1. The connection between the circuit board assembly 4 and the ground wire is further ensured.

[0034] Each of the three groups of stator windings 3 is connected to a winding pin 31, and the end of each winding pin 31 is inserted into the circuit board assembly 4 and is connected to the circuit of the circuit board assembly 4. The winding pin 31 and the ground wire pin 6 are respectively located on both sides of the shaft hole 12 of the stator core 1. The fixation of the circuit board assembly 4 is enhanced, the process route is changed, and the abnormal state of the circuit board assembly 4 after installation, such as unevenness and shaking, can be reduced, thereby enhancing the reliability of the motor.

[0035] Embodiment 2:

[0036] This embodiment provides an outer rotor motor, including a rotor assembly and a stator assembly 100, characterized in that the stator assembly 100 is the stator assembly described in Embodiment 1. By improving the structure of the stator assembly 100, the circuit board assembly 4 is connected to the ground wire, thereby ensuring the safety performance of the motor.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model 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 utility model.

Claims

1. A stator assembly, comprising a stator core (1), an end insulation (2) embedded in the stator core (1), a stator winding (3) wound on the end insulation (2), a circuit board assembly (4) installed on one axial side of the stator core (1), and a bearing seat (5) arranged in the stator core (1), one end of the bearing seat (5) is connected to a driver housing (51), and the driver housing (51) is covered outside the circuit board assembly (4), characterized in that: It also includes a ground wire pin (6), the bottom of which is fixed in the stator slot (11) of the stator core (1) via a slot wedge (7), the top of which is inserted into the circuit board assembly (4) and is electrically connected to the ground wire on the circuit board assembly (4), and the middle of the ground wire pin (6) is in contact with the wall surface of the stator slot (11) of the stator core (1) and is electrically connected to the stator core (1).

2. A stator assembly according to claim 1, characterized in that: The middle two sides of the ground wire pin (6) are in contact with the wall surface of the stator slot (11) of the stator core (1) and are electrically connected. Specifically, a cavity (71) is provided inside the slot wedge (7), and avoidance grooves (72) are provided on both sides of the outlet of the cavity (71). The bottom of the ground wire pin (6) is inserted into the cavity (71), and the middle two sides of the ground wire pin (6) protrude outwardly with a clamping block (61), which is clamped in the avoidance groove (72) and the side surface of the clamping block (61) protrudes outside the avoidance groove (72). The clamping block (61) is in contact with the wall surface of the stator slot (11) of the stator core (1) and is electrically connected.

3. A stator assembly according to claim 2, characterized in that: The clamping block (61) is interference-fitted with the wall surface of the stator slot (11) of the stator core (1).

4. A stator assembly according to claim 3, characterized in that: A spacer (73) protrudes axially from the top of the slot wedge (7), the spacer (73) protrudes outside the end insulation (2) and the spacer (73) separates the ground wire pin (6) and the stator winding (3).

5. A stator assembly according to claim 3, characterized in that: The width of the clamping block (61) of the ground wire pin (6) gradually increases from bottom to top.

6. A stator assembly according to any one of claims 1 to 5, characterized in that: The bearing seat (5) and the stator core (1) are injection molded together, and the bearing seat (5) and the stator core (1) are electrically connected and conductive.

7. A stator assembly according to claim 6, characterized in that: The stator winding (3) has three groups, each group is connected to a winding pin (31), the end of each winding pin (31) is inserted into the circuit board assembly (4) and is connected to the circuit of the circuit board assembly (4), and the winding pin (31) and the ground wire pin (6) are respectively located on both sides of the shaft hole (12) of the stator core (1).

8. An outer rotor motor, comprising a rotor assembly and a stator assembly (100), characterized in that: The stator assembly (100) is the stator assembly according to any one of claims 1 to 7.

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