EMC (Electro Magnetic Compatibility) structure for suppressing high-current injection signal of glass lifter motor

Abstract

The utility model discloses an EMC (Electro Magnetic Compatibility) structure for inhibiting a heavy current injection signal of a window glass lifter motor, which comprises a motor, a brush carrier assembly, a connector and a reduction gear box, the connector is electrically connected with the brush carrier assembly, the brush carrier assembly is electrically connected with the motor, and the motor drives the reduction gear box to work. The brush holder assembly comprises a brush holder and an EMC circuit which is arranged in the brush holder and used for suppressing emission type and immunity type test items, and a plurality of pin grooves and grounding grooves are formed in the brush holder; pins of electronic components in the EMC circuit for suppressing the large current injection signal are placed in the adjacent grounding grooves, and contact pins of the connector are electrically connected to the EMC circuit for suppressing emission and immunity test items in the brush carrier assembly through contact pin grooves. The motor is simple in design and assembly, effectively solves the problem of signal interference caused by large current injection of a conventional window glass lifter motor, and the EMC performance meets the requirements of new energy EMC standards.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to an EMC structure for suppressing large current injection signals of a glass lifter motor. Background Art

[0002] With the rapid development of the automotive industry and the continuous reform of the market, customers have higher and higher requirements for products, and the automotive industry standards have increasingly stringent requirements for the electromagnetic compatibility (EMC) performance of products. The automotive window lift motors currently used in the market generally have poor EMC performance, especially poor anti-interference performance, which is specifically manifested in the product's easy deviation when large current is injected. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an EMC structure for suppressing large current injection signals in order to meet the requirements of large current injection testing, in view of the common problem of low EMC performance, especially poor anti-interference performance, of existing automobile window lifter motors.

[0004] The technical problem to be solved by the utility model can be achieved through the following technical solutions:

[0005] An EMC structure for suppressing large current injection signals of a glass lifter motor comprises a motor, a brush holder assembly, a connector and a reduction gearbox, wherein the connector is electrically connected to the brush holder assembly, the brush holder assembly is electrically connected to the motor, the motor drives the reduction gearbox to work, the brush holder assembly comprises a brush holder and an EMC circuit for suppressing emission and immunity test items arranged in the brush holder, and a plurality of pin slots and grounding slots are provided on the brush holder; the pins of the electronic components in the EMC circuit for suppressing large current injection signals are placed in adjacent grounding slots, and the pins of the connector are electrically connected to the EMC circuit for suppressing emission and immunity test items in the brush holder assembly through the pin slots.

[0006] In a preferred embodiment of the present invention, the grounding groove surrounds one-third of the diameter of the pins of the electronic components in the EMC circuit for suppressing large current injection signals, so that two-thirds of the diameter of the pins of the electronic components in the EMC circuit for suppressing large current injection signals are exposed and in close contact with the casing of the motor.

[0007] In a preferred embodiment of the present invention, the grounding grooves are symmetrically arranged on the brush holder.

[0008] In a preferred embodiment of the present invention, the casing is an integrally formed casing, and the stator, the rotor and the brush holder of the motor are wrapped inside the integrally formed casing.

[0009] In a preferred embodiment of the present invention, a PCB board is further provided in the connector, an RC circuit is provided on the PCB board, and the RC circuit is electrically connected to the pin.

[0010] In a preferred embodiment of the utility model, the RC circuit includes a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a first chip, a second chip, both ends of the first capacitor, pin 1 and pin 3 of the first chip, and pin 1 and pin 3 of the second chip are connected to PWR and GND, pin 2 of the first chip is connected to one end of the first resistor, pin 2 of the second chip is connected to one end of the second resistor, the other end of the first resistor, the other end of the second resistor, one end of the second capacitor and one end of the third capacitor are connected to VCC+, and the other end of the second capacitor and the other end of the third capacitor are grounded; the model of the first chip and the second chip is A1212, and the brand is Allergo.

[0011] Due to the adoption of the above technical solution, the utility model solves the EMC emission interference problem by implementing an EMC circuit in the brush holder to suppress large current injection signals, and at the same time, performs induction and protection design in the PCB board of the connector to improve the EMC anti-interference capability. The brush holder assembly of the utility model is provided with pins to facilitate matching of connectors with different functions. It is universal and can meet the diverse product structure and functional requirements, while adapting to different customer requirements, saving design time and improving market competitiveness. The utility model is simple to design and assemble, especially the RC circuit which effectively solves the signal interference problem caused by large current injection of the existing window lift motor, and the RC circuit is also universal, simple to apply, cost-controlled, applicable to products and circuits, and the EMC performance meets the requirements of new energy EMC standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an exploded schematic diagram of the window lifter motor of the present utility model.

[0013] Figure 2 The utility model is a schematic diagram of the casing structure of the window lifter motor.

[0014] Figure 3 The utility model is a schematic diagram of the brush holder assembly structure in the window lifter motor.

[0015] Figure 4 The utility model is a schematic diagram of the connector structure in the window lifter motor.

[0016] Figure 5 The figure is a schematic diagram of the electrical principle of the RC circuit in the window lifter motor of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0018] See also Figure 1 The window lifter motor shown in the figure includes a motor 10, a brush holder assembly 20, a connector 40 and a reduction gear box 30. The connector 40 is electrically connected to the brush holder assembly 20, the brush holder assembly 20 is electrically connected to the motor 10, and the motor 10 drives the reduction gear box 30 to work.

[0019] See also Figure 3 The brush holder assembly 20 includes a brush holder 21 and an EMC circuit for suppressing emission and immunity test items arranged in the brush holder 21. The inductance in the EMC circuit for suppressing emission and immunity test items selects the maximum value in a limited space, the capacitor is arranged according to its own resonance characteristics and EMC frequency band requirements, the thermal protector is selected according to the product current and disconnection time, and the varistor is selected according to its own clamping characteristics and product transient performance.

[0020] The brush holder 21 is provided with a pin slot 21a and a grounding slot 21b. The pins of some electronic components in the EMC circuit of the emission suppression and immunity test items in the brush holder 21 are placed in the grounding slot 21b.

[0021] The grounding groove 21 b surrounds one third of the diameter of the electronic component pin 22 , so that two thirds of the diameter of the electronic component pin 22 is exposed and in close contact with the housing 11 of the motor 10 .

[0022] The grounding grooves 21 b of the brush holder 21 are symmetrically arranged on the brush holder 21 .

[0023] See also Figure 2 Combined with Figure 1 The housing 11 is an integrally formed housing, and the stator, rotor 12 and brush holder 20 of the motor 10 are wrapped inside the integrally formed housing.

[0024] See also Figure 4 Combined with Figure 1 , a PCB board 41 and a pin 42 are arranged in the connector 40, and an RC circuit is arranged on the PCB board 41, and the RC circuit is electrically connected to the pin 42. The pin 42 can match connectors with different functions. There are three types of connectors 40, which can be designed according to different customer needs, corresponding to three functional requirements, such as no anti-pinch requirement, Hall anti-pinch requirement, and electronic module anti-pinch requirement. The PCB board 41 is mainly designed according to the risks of EMC immunity test items, especially the situation where large current is injected into the product causing deviation of the product signal. The pin 42 is electrically connected to the EMC circuit in the brush holder 21 through the pin slot 21.

[0025] See also Figure 5The RC circuit absorbs and weakens the online energy interference injected by large current. At the same time, the RC circuit is simple in design and can be applied to different products and circuits. It includes capacitor C2 (the aforementioned first capacitor), second capacitor C3 (the aforementioned second capacitor), capacitor C4 (the aforementioned third capacitor), resistor R3 (the aforementioned first resistor), resistor R4 (the aforementioned second resistor), chip U1 (the aforementioned first chip), chip U2 (the aforementioned second chip), the model of chips U1 and U2 is A1212, and the brand is Allergo.

[0026] The two ends of capacitor C2, pin 1 and pin 3 of chip U1, and pin 1 and pin 3 of chip U2 are connected to PWR and GND, pin 2 of chip U1 is connected to one end of resistor R3, pin 2 of chip U2 is connected to one end of resistor R4, the other end of resistor R3, the other end of resistor R4, one end of capacitor C3 and one end of capacitor C4 are connected to VCC+, and the other end of capacitor C3 and the other end of capacitor C4 are grounded.

Claims

1. An EMC structure for suppressing large current injection signals of a window lifter motor, comprising a motor, a brush holder assembly, a connector and a reduction gearbox, wherein the connector is electrically connected to the brush holder assembly, the brush holder assembly is electrically connected to the motor, and the motor drives the reduction gearbox to work, characterized in that: The brush holder assembly includes a brush holder and an EMC circuit for suppressing emission and immunity test items arranged in the brush holder, and a plurality of pin slots and a grounding slot are provided on the brush holder; the pins of the electronic components in the EMC circuit for suppressing large current injection signals are placed in adjacent grounding slots, and the pins of the connector are electrically connected to the EMC circuit for suppressing emission and immunity test items in the brush holder assembly through the pin slots.

2. The EMC structure for suppressing large current injection signals of a window lifter motor according to claim 1, characterized in that: The grounding groove surrounds one third of the diameter of the pins of the electronic components in the EMC circuit for suppressing large current injection signals, so that two thirds of the diameter of the pins of the electronic components in the EMC circuit for suppressing large current injection signals are exposed and in close contact with the housing of the motor.

3. The EMC structure for suppressing large current injection signals of a window lifter motor according to claim 2, characterized in that: The grounding grooves are symmetrically arranged on the brush holder.

4. The EMC structure for suppressing large current injection signals of a window lifter motor according to claim 3, characterized in that: The housing is an integrally formed housing, and the stator, the rotor and the brush holder of the motor are wrapped inside the integrally formed housing.

5. The EMC structure for suppressing large current injection signals of a window lifter motor according to claim 3, characterized in that: A PCB board is also arranged in the connector, an RC circuit is arranged on the PCB board, and the RC circuit is electrically connected to the pin.

6. The EMC structure for suppressing large current injection signals of a window lifter motor according to claim 5, characterized in that: The RC circuit includes a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a first chip, and a second chip. The two ends of the first capacitor, pin 1 and pin 3 of the first chip, and pin 1 and pin 3 of the second chip are connected to PWR and GND, pin 2 of the first chip is connected to one end of the first resistor, and pin 2 of the second chip is connected to one end of the second resistor. The other end of the first resistor, the other end of the second resistor, one end of the second capacitor, and one end of the third capacitor are connected to VCC+, and the other end of the second capacitor and the other end of the third capacitor are grounded. The model of the first chip and the second chip is A1212, and the brand is Allergo.

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