EMC (Electro Magnetic Compatibility) structure of small leg support motor

Abstract

The utility model discloses a small leg support motor EMC structure, which is characterized in that the small leg support motor EMC structure comprises a motor, a brush holder assembly, a filtering PCB assembly and a shielding end cover, the motor comprises a casing, a stator part and a rotor part, the stator part and the rotor part are installed in the casing, the brush holder assembly is installed in the casing, and the filtering PCB assembly is installed in the casing. The filtering PCB assembly is installed on the brush holder assembly through the shielding end cover and located in the shielding end cover and the machine shell, the shielding end cover is fixed to the brush holder assembly through metal screws, and the metal screws, the shielding end cover and the machine shell form a shielding structure together. The EMC structure of the small leg support motor has universality, can effectively meet the test requirements of diversified product structures and most brand automobiles, saves time for later schemes, and improves the market competitiveness at the same time. The EMC performance of the small-sized leg support motor EMC structure provided by the utility model meets the standard requirements of COSPR25, GEELY, NIO and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of leg support motors, in particular to an EMC structure of a small leg support motor. Background Art

[0002] With the rapid development of the new energy vehicle industry, small and light products are becoming more and more popular among customers. Many suppliers in the industry are investing a lot of resources in developing small products.

[0003] The research and development and design are centered around the leg rest motor (with a diameter of only 29.7mm). As the leg rest motor is limited by the seat space structure, it faces considerable challenges to achieve high performance and high electromagnetic compatibility level. In addition, product development also has strict requirements on production process and material cost. The electromagnetic compatibility level of the current leg rest motor is still low and cannot meet customer requirements. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the electromagnetic compatibility level of the current leg rest motor is still low and cannot meet the customer requirements, and a small leg rest motor EMC structure is provided, the electromagnetic compatibility performance of the leg rest motor meets the requirements of CISPR 25, GEELY, NIO and other standards.

[0005] The technical problem to be solved by the utility model can be achieved through the following technical solutions:

[0006] A small leg support motor EMC structure includes a motor, a brush holder assembly, a filter PCB assembly and a shielding end cover, the motor includes a casing and a stator component and a rotor component installed in the casing, the brush holder assembly is installed in the casing, the filter PCB assembly is installed on the brush holder assembly through the shielding end cover and is located in the shielding end cover and the casing, the shielding end cover is fixed to the brush holder assembly by metal screws, and the metal screws, the shielding end cover and the casing together form a shielding structure.

[0007] In a preferred embodiment of the utility model, a circular ring-shaped grounding position is provided on the filter PCB assembly, and the metal screw passes through the ladder-type grounding member and is grounded to the circular ring-shaped grounding position.

[0008] In a preferred embodiment of the present invention, a brush holder fixing column is provided on the brush holder assembly, and the brush holder fixing column passes through the inner hole at the circular ring position and is connected to the metal screw.

[0009] In a preferred embodiment of the present invention, it further comprises a ladder-type grounding member, the grounding member is grounded to the annular grounding position, and the metal screw passes through the ladder-type grounding member and is grounded to the annular grounding position.

[0010] In a preferred embodiment of the present invention, the ladder-type grounding member and the shielding end cover are grounded via the metal screws.

[0011] In a preferred embodiment of the present invention, the ladder-type grounding component is a ladder-type structure, wherein the inner step ensures contact with the fixing column on the brush holder assembly, and the outer step ensures contact with the shielding end cover.

[0012] In a preferred embodiment of the present invention, the filtering PCB assembly is a double-layer PCB assembly.

[0013] In a preferred embodiment of the present utility model, the filter PCB assembly, grounding member, and metal screws form a first-order filter; the electronic components in the brush holder assembly form a second-order filter; and the shielding end cover and housing form a third-order filter.

[0014] Due to the adoption of the above technical solution, the utility model perfectly integrates the "shielding design" with the motor structure based on electromagnetic conduction emission considerations, designs a ladder-type grounding component, shortens the path of the electronic component-grounding capacitor, ensures its nearby grounding, and avoids the problem of increased parasitic parameters and weakening its filtering effect due to the excessively long wiring of the components. At the same time, a double-layer PCB is designed inside the motor, and the grounding area is increased by performing a circular ring treatment on the PCB grounding point, so that the grounding capacitor is effectively grounded through the ladder-type grounding component. The utility model motor adopts a multi-filter design, which not only takes into account the Hall conductor function, but also effectively controls the EMC problems caused by low, medium and high frequencies.

[0015] The EMC structure of the small leg rest motor of the utility model is universal and can effectively meet the test requirements of diversified product structures and most brands of cars, saving time for later plans and improving market competitiveness. The EMC performance of the small leg rest motor EMC structure of the utility model meets the requirements of COSPR25, GEELY, NIO and other standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the decomposition of the EMC structure of the small leg support motor of the present utility model.

[0017] Figure 2 It is a structural schematic diagram of the shielding end cover and metal screws in the EMC structure of the small leg support motor of the utility model.

[0018] Figure 3 It is a structural schematic diagram of the casing in the EMC structure of the small leg support motor of the utility model.

[0019] Figure 4It is a schematic diagram of the assembly between the filter PCB component and the grounding component in the EMC structure of the small leg support motor of the utility model.

[0020] Figure 5 It is a structural schematic diagram of the filter PCB assembly in the EMC structure of the small leg support motor of the utility model.

[0021] Figure 6 It is a schematic diagram of the assembly between the filter PCB component and the brush holder assembly in the EMC structure of the small leg support motor of the utility model. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0023] See also Figures 1 to 6 A small leg support motor EMC structure shown in the figure includes a motor 10, a brush holder assembly 20, a filter PCB assembly 30 and a shielding end cover 40. The motor 10 includes a casing 11 and a stator component and a rotor component installed in the casing 11. The brush holder assembly 20 is installed in the casing 11. The filter PCB assembly 30 is installed on the brush holder assembly 20 through two metal screws 50 and two ladder-type grounding members 60 and is located in the shielding end cover 40 and the casing 11. The shielding end cover 40 is also fixed to the brush holder assembly 20 through two metal screws 50. The metal screws 50, the shielding end cover 40 and the casing 11 together form a shielding structure, which can limit the leakage of electromagnetic energy radiated from the inside of the motor 10 on the one hand, and prevent external radiation interference from entering the inside of the motor 10 on the other hand.

[0024] Two circular grounding positions 31 are provided on the filter PCB assembly 30, namely the ground of the filter PCB assembly 30. The circular ring design maximizes the grounding area on the basis of making full use of the limited space, which is beneficial to the grounding of the grounded electronic components.

[0025] Two brush holder fixing posts 21 are arranged on the brush holder assembly 20, two ladder-type grounding members 60 are grounded and connected to two annular grounding positions 31 by means of interference fit through two metal screws 50, the two brush holder fixing posts 21 respectively pass through the inner holes of the two annular grounding positions 31 and the two ladder-type grounding members 60 and are connected to the metal screws 50, the metal screws 50 pass through the ladder-type grounding members 60 and are grounded therewith, and at the same time, the ladder-type grounding members 60 are grounded and connected to the shielding end cover 40 by means of the metal screws 50. The ladder-type grounding member 60 is a ladder-type structure, the inner steps of which ensure contact with the brush holder fixing posts 21 on the brush holder assembly 20, and the outer steps ensure contact with the shielding end cover 40.

[0026] The ladder-type grounding component 60 is not only connected to the filter PCB assembly 30, but can also be connected to the shielding end cover 40 through the metal screws 50, thereby achieving local grounding and giving full play to the role of the grounding electronic device.

[0027] The filter PCB assembly 30 is a double-layer PCB assembly, which is designed and selected for different EMC frequency bands, and integrates low, medium and high frequency filtering capabilities. The filter PCB assembly 30 is designed and selected for different levels of filtering electronic components in different EMC frequency bands, and the electronic components are selected for parameters, integrating low, medium and high frequency filtering capabilities and transient voltage absorption capabilities.

[0028] The filter PCB assembly 30, the grounding member 60, and the metal screws 50 form a first-order filter; the electronic components in the brush holder assembly 20 form a second-order filter; and the shielding end cover 40 and the housing 11 form a third-order filter.

Claims

1. A small leg support motor EMC structure, characterized in that: It includes a motor, a brush holder assembly, a filter PCB assembly and a shielding end cover. The motor includes a casing and a stator component and a rotor component installed in the casing. The brush holder assembly is installed in the casing. The filter PCB assembly is installed on the brush holder assembly through the shielding end cover and is located in the shielding end cover and the casing. The shielding end cover is fixed to the brush holder assembly by metal screws. The metal screws, the shielding end cover and the casing together form a shielding structure.

2. A small leg support motor EMC structure according to claim 1, characterized in that: A circular ring-shaped grounding position is arranged on the filtering PCB assembly, and the metal screw passes through the circular ring-shaped grounding position and is grounded to the circular ring-shaped grounding position.

3. A small leg support motor EMC structure according to claim 2, characterized in that: A brush holder fixing column is arranged on the brush holder assembly, and the brush holder fixing column passes through the inner hole of the circular ring-shaped grounding position and is connected with the metal screw.

4. A small leg support motor EMC structure according to claim 3, characterized in that: It also includes a ladder-type grounding member, which is grounded to the annular grounding position, and the metal screw passes through the grounding member and is grounded to the annular grounding position.

5. A small leg support motor EMC structure according to claim 4, characterized in that: The grounding component and the shielding end cover are grounded and connected via the metal screw.

6. A small leg support motor EMC structure according to claim 5, characterized in that: The ladder-type grounding component is a ladder-type structure, wherein the inner step ensures contact with the fixing column on the brush holder assembly, and the outer step ensures contact with the shielding end cover.

7. A small leg support motor EMC structure according to claim 6, characterized in that: The filtering PCB assembly is a double-layer PCB assembly.

8. A small leg support motor EMC structure according to claim 7, characterized in that: The filtering PCB assembly, the grounding member, and the metal screws form a first-order filter; the electronic components in the brush holder assembly form a second-order filter; and the shielding end cover and the housing form a third-order filter.

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