A motor end cover assembly

Abstract

The utility model relates to motor parts technical field especially relates to a motor end cover subassembly, its characterized in that, including end cover, middle plate, two groups of brush hold components, two carbon crystals, two damping strips and two capacitors, the inner side wall of end cover is fixedly connected with middle plate, is equipped with two storage grooves, two special-shaped grooves and two first U -shaped slots on the middle plate, every group of brush hold components includes vertical section and horizontal section, and the vertical section is detachably inserted in the corresponding special-shaped groove on the middle plate, every carbon crystal is arranged in the opening slot of the horizontal section of corresponding brush hold component respectively, every damping strip is respectively affixed in the horizontal section side wall of corresponding brush hold component, every capacitor is contained in the corresponding storage groove, and the first pin of every capacitor is embedded in the corresponding first U -shaped slot, and the second pin of every capacitor is embedded in the second U -shaped slot set up on the vertical section of corresponding brush hold component, two groups of brush hold components, two carbon crystals, two damping strips and two capacitors are symmetrically arranged about the middle plate.

Description

Technical Field

[0001] This utility model relates to the field of motor component technology, and in particular to a motor end cover assembly. Background Technology

[0002] As an important component of the motor, the motor end cover is usually installed at both ends of the motor stator. It is generally made of metal materials such as aluminum alloy and cast iron or engineering plastics. It works together with the motor housing to form a closed cavity. This closed cavity can not only effectively protect the internal components of the motor from external dust, moisture, foreign objects and other disturbances, but also provide a relatively stable environment for the electromagnetic conversion and other working processes inside the motor.

[0003] However, the existing motor end cap brush holder assembly and carbon crystal components cannot meet the requirements of the EMC standard EN55014-1 for household appliances, nor do they meet the Class 3 specifications of the automotive EMC standard CISPR25. In order to enable the motor end cap to meet the EMC requirements of household appliances and automotive components and improve the performance and reliability of the motor in different application scenarios, it is necessary to improve the structure of the existing motor end cap to solve the electromagnetic compatibility problems of the brush holder assembly and carbon crystal components, so as to adapt to the increasingly high technical requirements of the household appliance and automotive industries for motors. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a motor end cover assembly.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A motor end cover assembly, characterized in that it comprises an end cover, a middle plate, two sets of brush holder assemblies, two carbon crystals, two damping strips, and two capacitors; the middle plate is fixedly connected to the inner sidewall of the end cover, and the middle plate is provided with two receiving slots, two irregular slots, and two first U-shaped slots; each set of brush holder assemblies includes an integrally formed vertical section and a horizontal section, the vertical section being detachably inserted into the corresponding irregular slot on the middle plate, and the end of the vertical section away from the horizontal section passing through the irregular slot and exposed on the outside of the end cover; each carbon crystal is respectively disposed in the opening slot of the horizontal section of the corresponding brush holder assembly; each damping strip is respectively attached to the sidewall of the horizontal section of the corresponding brush holder assembly; each capacitor is respectively housed in the corresponding receiving slot, the first pin of each capacitor is fitted into the corresponding first U-shaped slot, and the second pin of each capacitor is fitted into the second U-shaped slot provided on the vertical section of the corresponding brush holder assembly; the two sets of brush holder assemblies, the two carbon crystals, the two damping strips, and the two capacitors are symmetrically arranged about the middle plate.

[0007] Furthermore, the middle plate has a positioning protrusion on the side facing the end cover, and the end cover has a positioning groove that matches the positioning protrusion.

[0008] Furthermore, the central area of ​​the end cap is provided with a bearing cavity, a bearing is provided inside the bearing cavity, and a stop plate is provided between the bearing and the inner wall of the bearing cavity.

[0009] Furthermore, the capacitor is a surface-mount ceramic capacitor.

[0010] Furthermore, the symmetrical arrangement of the middle plate refers to the following: the two sets of brush holder assemblies, two carbon crystals, two damping strips, and two capacitors are arranged in a 180-degree rotational symmetry with the center point of the middle plate as the symmetry point.

[0011] Furthermore, the horizontal segment includes a first horizontal segment and a second horizontal segment, with an obtuse angle between the first horizontal segment and the second horizontal segment; the damping strip is fixed to the side wall of the first horizontal segment by a conductive adhesive, and the length extension direction of the damping strip is parallel to the extension direction of the first horizontal segment; the opening groove is provided in the second horizontal segment, and the sliding direction of the carbon crystal is perpendicular to the wall thickness direction of the second horizontal segment.

[0012] Furthermore, the installation position of the damping strip is configured such that when the carbon crystal slides in the open groove, the straight-line distance between the midpoint of the long side of the damping strip and the electrical contact point of the carbon crystal is less than 3mm.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] Compared with existing technologies, the symmetrical layout of this structure, combined with the near-field coupling design of capacitors and damping strips, forms a high-efficiency filtering network, reducing conducted interference by more than 10dB and radiated emissions meeting Class 3 limits. It effectively solves the electromagnetic compatibility problems of existing motor end covers and meets the Class 3 specifications of the household appliance EMC standard EN55014-1 and the automotive component EMC standard CISPR25, improving the performance and reliability of the motor in different application scenarios. The detachable design of the brush holder assembly facilitates the replacement of carbon crystals, and the modular layout simplifies the assembly process of components, making subsequent maintenance more convenient. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the motor end cover assembly proposed in this utility model;

[0016] Figure 2 This is an exploded view of the motor end cover assembly proposed in this utility model;

[0017] Figure 3 This is a cross-sectional view of the motor end cover assembly proposed in this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the plastic middle plate in the motor end cover assembly proposed in this utility model.

[0019] In the diagram: 1-End cap, 101-Bearing cavity, 102-Positioning groove, 2-Middle plate, 201-Positioning protrusion, 202-Storage groove, 203-Irregular groove, 204-First U-shaped groove, 3-Brush grip assembly, 301-Vertical section, 302-Horizontal section, 3021-First horizontal section, 3022-Second horizontal section, 303-Second U-shaped groove, 304-Opening groove, 4-Carbon crystal, 5-Damping strip, 6-Bearing, 7-Stop plate, 8-Capacitor, 801-First pin, 802-Second pin. Detailed Implementation

[0020] 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.

[0021] like Figures 1-4 As shown, this embodiment provides a motor end cover assembly, characterized in that it includes an end cover 1, a middle plate 2, two sets of brush holder assemblies 3, two carbon crystals 4, two damping strips 5, and two capacitors 8; the middle plate 2 is fixedly connected to the inner side wall of the end cover 1, and the middle plate 2 is provided with two storage slots 202, two irregular grooves 203, and two first U-shaped grooves 204; each set of brush holder assemblies 3 includes an integrally formed vertical section 301 and a horizontal section 302, the vertical section 301 is detachably inserted into the corresponding irregular groove 203 on the middle plate 2, and the end of the vertical section 301 away from the horizontal section 302 passes through the irregular groove 203 and... The carbon crystal 4 is exposed on the outside of the end cap 1; each carbon crystal 4 is respectively set in the opening groove 304 of the horizontal section 302 of the corresponding brush grip assembly 3; each damping strip 5 is respectively attached to the side wall of the horizontal section 302 of the corresponding brush grip assembly 3; each capacitor 8 is respectively housed in the corresponding storage groove 202, the first pin 801 of each capacitor 8 is fitted into the corresponding first U-shaped groove 204, and the second pin 802 of each capacitor 8 is fitted into the second U-shaped groove 303 set on the vertical section 301 of the corresponding brush grip assembly 3; the two sets of brush grip assemblies 3, two carbon crystals 4, two damping strips 5 and two capacitors 8 are symmetrically arranged about the middle plate 2.

[0022] During installation, the middle plate 2 is first fixed to the inner wall of the end cover 1. Then, the vertical section 301 of the brush holder assembly 3 is inserted into the irregular groove 203 of the middle plate 2, so that the vertical section 301 is exposed on the outside of the end cover 1 for easy connection with external circuits. Next, the carbon crystal 4 is installed in the opening groove 304 of the horizontal section 302, the damping strip 5 is attached to the side wall of the horizontal section 302, and the capacitor 8 is placed in the storage groove 202. The first pin 801 and the second pin 802 of the capacitor 8 are respectively embedded in the first U-shaped groove 204 and the second U-shaped groove 303 to realize the electrical connection between the capacitor 8 and the brush holder assembly 3. Since the components are symmetrically arranged about the middle plate 2, the electromagnetic radiation and anti-interference performance of the entire assembly are more balanced, meeting the EMC standards of home appliances and automotive components, and improving the compatibility of the end cover 1.

[0023] like Figures 1-2 As shown, in this embodiment, the middle plate 2 is provided with a positioning protrusion 201 on the side facing the end cover 1, and the end cover 1 is provided with a positioning groove 102 that matches the positioning protrusion 201.

[0024] By cooperating with the positioning protrusion 201 and the positioning groove 102, the position of the middle plate 2 can be accurately determined when installing the middle plate 2, thereby improving the stability of the installation of the middle plate 2 and avoiding the connection and electromagnetic compatibility between various components due to the deviation of the installation position of the middle plate 2; other structures and installation methods are the same as described above.

[0025] like Figures 2-3 As shown, in this embodiment, the central area of ​​the end cap 1 is provided with a bearing cavity 101, a bearing 6 is provided in the bearing cavity 101, and a stop plate 7 is provided between the bearing 6 and the inner wall of the bearing cavity 101.

[0026] Specifically, the central area of ​​the end cover 1 is provided with a bearing cavity 101, and a bearing 6 is provided inside the bearing cavity 101. A stop plate 7 is provided between the bearing 6 and the inner wall of the bearing cavity 101. The stop plate 7 can prevent the bearing 6 from moving axially in the bearing cavity 101, ensuring the stable rotation of the motor rotor and improving the overall performance of the motor.

[0027] like Figures 1-2 As shown, in this embodiment, the capacitor 8 is a surface-mount ceramic capacitor 8.

[0028] Capacitor 8 is a surface-mount ceramic capacitor, which is small in size and has excellent high-frequency filtering characteristics, and can effectively suppress high-frequency noise generated by carbon brush commutation.

[0029] like Figures 1-2 As shown, in this embodiment, the symmetrical arrangement of the middle plate 2 means that the two sets of brush gripping components 3, the two carbon crystals 4, the two damping strips 5 and the two capacitors 8 are arranged in a 180-degree rotational symmetry with the center point of the middle plate 2 as the symmetry point.

[0030] Specifically, the two sets of brush holder components 3, two carbon crystals 4, two damping strips 5, and two capacitors 8 are arranged in a 180-degree rotational symmetry with the center point of the middle plate 2 as the symmetry point. The symmetrical layout, combined with the near-field coupling design of capacitors 8 and damping strips 5, forms a high-efficiency filtering network, reducing conducted interference by more than 10dB and radiated emissions meeting the Class 3 limit. When the motor rotates, the carbon crystals 4 slide and rotate with the commutator in the open slot 304, and the high-frequency noise generated at the contact interface can be suppressed through two paths.

[0031] like Figures 1-2 As shown, in this embodiment, the horizontal segment 302 includes a first horizontal segment 3021 and a second horizontal segment 3022, with an obtuse angle between the first horizontal segment 3021 and the second horizontal segment 3022; the damping strip 5 is fixed to the side wall of the first horizontal segment 3021 by a conductive adhesive, and the length extension direction of the damping strip 5 is parallel to the extension direction of the first horizontal segment 3021; ​​the opening groove 304 is provided in the second horizontal segment 3022, and the sliding direction of the carbon crystal 4 is perpendicular to the wall thickness direction of the second horizontal segment 3022.

[0032] This structural design makes the carbon crystal 4 more stable when sliding within the opening groove 304, and the damping strip 5 can more effectively suppress the electromagnetic interference generated by the sliding of the carbon crystal 4. At the same time, the conductive adhesive ensures the conductivity of the damping strip 5, allowing the damping strip 5 to play a better role.

[0033] like Figures 1-2 As shown, in this embodiment, the installation position of the damping strip 5 is configured such that when the carbon crystal 4 slides in the opening groove 304, the straight-line distance between the midpoint of the long side of the damping strip 5 and the electrical contact point of the carbon crystal 4 is less than 3mm.

[0034] Specifically, the installation position of the damping strip 5 is configured such that when the carbon crystal 4 slides in the opening groove 304, the straight-line distance between the midpoint of the long side of the damping strip 5 and the electrical contact point of the carbon crystal 4 is less than 3mm. This close-range setting enables the damping strip 5 to suppress electromagnetic interference more quickly and effectively, further improving the electromagnetic compatibility of the component and meeting higher EMC standard requirements.

[0035] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0037] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A motor end cover assembly, characterized in that, The system includes an end cap (1), a middle plate (2), two sets of brush grip assemblies (3), two carbon crystals (4), two damping strips (5), and two capacitors (8). The middle plate (2) is fixedly connected to the inner wall of the end cap (1). The middle plate (2) is provided with two storage slots (202), two irregular slots (203), and two first U-shaped slots (204). Each set of brush grip assemblies (3) includes an integrally formed vertical section (301) and a horizontal section (302). The vertical section (301) is detachably inserted into the corresponding irregular slot (203) on the middle plate (2), and one end of the vertical section (301) away from the horizontal section (302) passes through the irregular slot (203) and is exposed outside the end cap (1). Each carbon crystal... (4) Each is set in the opening slot (304) of the horizontal section (302) of the corresponding brush grip assembly (3); each damping strip (5) is attached to the side wall of the horizontal section (302) of the corresponding brush grip assembly (3); each capacitor (8) is accommodated in the corresponding storage slot (202), the first pin (801) of each capacitor (8) is fitted into the corresponding first U-shaped slot (204), and the second pin (802) of each capacitor (8) is fitted into the second U-shaped slot (303) set on the vertical section (301) of the corresponding brush grip assembly (3); the two sets of brush grip assemblies (3), two carbon crystals (4), two damping strips (5) and two capacitors (8) are arranged symmetrically about the middle plate (2).

2. The motor end cover assembly according to claim 1, characterized in that, The middle plate (2) has a positioning protrusion (201) on the side facing the end cover (1), and the end cover (1) has a positioning groove (102) that matches the positioning protrusion (201).

3. The motor end cover assembly according to claim 1, characterized in that, The end cap (1) has a bearing cavity (101) in the center area, a bearing (6) is provided in the bearing cavity (101), and a stop plate (7) is provided between the bearing (6) and the inner wall of the bearing cavity (101).

4. The motor end cover assembly according to claim 1 or 2, characterized in that, The capacitor (8) is a surface-mount ceramic capacitor (8).

5. The motor end cover assembly according to claim 1, characterized in that, The symmetrical arrangement of the middle plate (2) refers to the arrangement of two sets of brush gripping components (3), two carbon crystals (4), two damping strips (5) and two capacitors (8) in a 180-degree rotational symmetry with the center point of the middle plate (2) as the symmetry point.

6. The motor end cover assembly according to claim 1, characterized in that, The horizontal segment (302) includes a first horizontal segment (3021) and a second horizontal segment (3022), with an obtuse angle between the first horizontal segment (3021) and the second horizontal segment (3022); the damping strip (5) is fixed to the side wall of the first horizontal segment (3021) by a conductive adhesive, and the length extension direction of the damping strip (5) is parallel to the extension direction of the first horizontal segment (3021); the opening groove (304) is provided in the second horizontal segment (3022), and the sliding direction of the carbon crystal (4) is perpendicular to the wall thickness direction of the second horizontal segment (3022).

7. The motor end cover assembly according to claim 1 or 6, characterized in that, The installation position of the damping strip (5) is configured such that when the carbon crystal (4) slides in the opening groove (304), the straight-line distance between the midpoint of the long side of the damping strip (5) and the electrical contact point of the carbon crystal (4) is less than 3mm.

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