CN215682073U - Windscreen wiper motor EMC multistage shielding system - Google Patents
Windscreen wiper motor EMC multistage shielding system Download PDFInfo
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- CN215682073U CN215682073U CN202121544201.XU CN202121544201U CN215682073U CN 215682073 U CN215682073 U CN 215682073U CN 202121544201 U CN202121544201 U CN 202121544201U CN 215682073 U CN215682073 U CN 215682073U
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Abstract
The application discloses multistage shielding system of windscreen wiper motor EMC includes: a first level shielding system, comprising: the first carbon brush is connected with the capacitor-inductor circuit in series, the second carbon brush is connected with the capacitor-inductor circuit in series, and the third carbon brush is connected with the inductor circuit in series; the first stage shielding system is grounded through the first shell; a second level shielding system, comprising: the first contact piece is connected with the capacitance-inductance circuit in series, the second contact piece is connected with the capacitance-inductance circuit in series, and the third contact piece is connected with the capacitance-inductance circuit in series; the second stage shield system is grounded through a second enclosure connected to the first enclosure. The two-stage electromagnetic shielding system is used for inhibiting the interference of induced potential pulses on the high-speed and low-speed carbon brushes and the reversing contact piece with the outside, and eliminating the induced potential of the wiper at the starting and stopping moment and the induced potential at the rotating and contacting moment of the contact piece; the first shell and the second shell isolate electromagnetic radiation generated by rotary contact of the contact piece in the starting and stopping moments of the motor and in the running process.
Description
Technical Field
The application belongs to the technical field of automobile windscreen wiper circuits and electromagnetic shielding, and particularly relates to an EMC multistage shielding system of a windscreen wiper motor, which is mainly suitable for improving the electromagnetic compatibility of the windscreen wiper motor.
Background
With the increasing of automobile electrical equipment, the electromagnetic compatibility among the automobile electrical systems also becomes a potential hazard which affects the safety and performance experience of automobiles. At present, the number of sensors on an automobile is increased, and when inductive loads such as an automobile wiper motor and the like work and are reversed or switched, transient voltage can be generated to generate interference on a circuit, and surge and harmonic waves generated by the wiper motor can interfere with the normal work of an electronic control module, so that logic errors of electronic devices or damage of sensing devices can be caused.
SUMMERY OF THE UTILITY MODEL
To overcome the defects or shortcomings of the prior art, the application provides an EMC multi-stage shielding system for a wiper motor.
In order to solve the technical problem, the application is realized by the following technical scheme:
the application provides a multistage shielding system of windscreen wiper motor EMC includes:
a first level shielding system, comprising: the first carbon brush is connected with the capacitor-inductor circuit in series, the second carbon brush is connected with the capacitor-inductor circuit in series, and the third carbon brush is connected with the inductor circuit in series; the first stage shielding system is grounded through the first shell;
a second level shielding system, comprising: the first contact piece is connected with the capacitance-inductance circuit in series, the second contact piece is connected with the capacitance-inductance circuit in series, and the third contact piece is connected with the capacitance-inductance circuit in series; the second stage shield system is grounded through a second enclosure connected to the first enclosure.
Further, above-mentioned wiper motor EMC multistage shield system, wherein, the first carbon brush concatenates electric capacity-inductance circuit and includes: first direct current flows to in proper order first inductance, behind the first electric capacity and through first shell ground connection.
Further, above-mentioned wiper motor EMC multistage shield system, wherein, the second carbon brush concatenates electric capacity-inductance circuit and includes: the second direct current flows to the second inductor and the second capacitor in sequence and then is grounded through the first shell.
Further, above-mentioned wiper motor EMC multistage shield system, wherein, the third carbon brush concatenates electric capacity-inductance circuit and includes: the circuit comprises a third inductor and a common terminal circuit, wherein the common terminal circuit passes through the third inductor and is connected with a second contact piece.
Further, in the above wiper motor EMC multi-stage shielding system, the first housing is enclosed by an aluminum turbine shell and a metal cover plate.
Further, the wiper motor EMC multi-stage shielding system is described above, wherein the first stage shielding system is placed in the first housing.
Further, foretell wiper motor EMC multistage shielding system, wherein, the first contact concatenates electric capacity-inductance circuit and includes: the direct current flows to the first contact piece after passing through the fourth capacitor and then passing through the other end of the fourth inductor and then being connected with the fifth capacitor and the sixth capacitor.
Further, foretell wiper motor EMC multistage shielding system, wherein, the second contact concatenates electric capacity-inductance circuit and includes: the second direct current flows to the second contact piece after passing through the seventh capacitor and then being connected with the eighth capacitor and the ninth capacitor through the other end of the fifth inductor.
Further, foretell wiper motor EMC multistage shielding system, wherein, the third contact concatenates electric capacity-inductance circuit and includes: the current of the third contact passes through the other end of the sixth inductor and then flows into the common-end circuit.
Further, the wiper motor EMC multi-stage shielding system is described above, wherein the second stage shielding system is placed in the second housing.
Compared with the prior art, the method has the following technical effects:
the two-stage electromagnetic shielding system is used for inhibiting the interference of induced potential pulses on the high-speed and low-speed carbon brushes and the reversing contact piece with the outside, and eliminating the induced potential of the wiper at the starting and stopping moment and the induced potential at the rotating and contacting moment of the contact piece; the first shell and the second shell isolate electromagnetic radiation generated by rotary contact of the contact piece in the starting and stopping moments of the motor and in the running process.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1: the circuit board in the EMC multi-stage shielding system of the wiper motor is shown as a first circuit board;
FIG. 2: a circuit schematic as shown in fig. 1;
FIG. 3: the circuit board diagram II of the EMC multi-stage shielding system of the wiper motor is shown;
FIG. 4: a schematic circuit diagram as shown in fig. 3;
FIG. 5: the application wiper motor EMC multistage shield system's outside structure chart.
Detailed Description
The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.
As shown in fig. 1 to 5, in one embodiment of the present application, an EMC multi-stage shielding system for a wiper motor includes:
a first level shielding system, comprising: the first carbon brush 21 is connected with the capacitance-inductance circuit in series, the second carbon brush 22 is connected with the capacitance-inductance circuit in series, and the third carbon brush 23 is connected with the inductance circuit in series; the first-stage shielding system is grounded through a first shell A;
a second level shielding system, comprising: the first contact piece 1 is connected with a capacitance-inductance circuit in series, the second contact piece 3 is connected with the capacitance-inductance circuit in series, and the third contact piece 2 is connected with the capacitance-inductance circuit in series; the second stage shielding system is grounded through a second housing B connected to the first housing a.
In this embodiment, the capacitance described below is preferably a 1uF capacitance, the inductance described below is preferably a 5uF inductance, and the voltage of direct current is preferably 27V.
This application suppresses the induced potential pulse and external interference on high low-speed carbon brush and the switching-over contact through two-stage electromagnetic shield system, eliminates the windscreen wiper and opens and stop induced potential and the contact rotation contact transient induced potential.
As shown in fig. 1 and fig. 2, the first carbon brush 21 (low-speed carbon brush) is connected in series with the capacitor-inductor circuit, and includes: first inductance 16 and first electric capacity 17, first direct current 4 flow to in proper order behind first inductance 16, first electric capacity 17 and through first shell A ground connection.
Further, in this embodiment, the second carbon brush 22 (high speed carbon brush) is connected in series with the capacitor-inductor circuit, which includes: a second inductor 18 and a second capacitor 19, and a second direct current 6 sequentially flows to the second inductor 18 and the second capacitor 19 and then is grounded through the first housing a.
The third carbon brush 23 (negative carbon brush) is connected in series with the capacitor-inductor circuit, and the capacitor-inductor circuit includes: a third inductor 20 and a common terminal circuit 5, wherein the common terminal circuit 5 is connected with the second contact 3 after passing through the third inductor 20.
In the first stage electromagnetic shielding system, the first carbon brush 21 (low speed carbon brush) is grounded through the first casing a after passing through the first capacitor 17, and the second carbon brush 22 (high speed carbon brush) is grounded through the first casing a after passing through the second capacitor 19. The above design absorbs the spark quenching of the first carbon bundle (low speed carbon brush) by the first capacitor 17 and absorbs the spark quenching of the second carbon brush 22 (high speed carbon brush) by the second capacitor 19.
Wherein M in fig. 1 is a motor.
As shown in fig. 3 and 4, the first contact 1 (low speed contact) is connected in series with the capacitor-inductor circuit, which includes: the direct current transformer comprises a first contact piece 1, a fourth capacitor 12, a fourth inductor 7, a fifth capacitor 11 and a sixth capacitor 10, wherein a first direct current 4 flows to the first contact piece 1 through the fourth capacitor 12 and then flows to the fifth capacitor 11 and the sixth capacitor 10 through the other end of the fourth inductor 7.
The second contact 3 (high-speed contact) is connected in series with a capacitance-inductance circuit, which comprises: a second contact piece 3, a fifth inductor 9, a seventh capacitor 15, an eighth capacitor 14 and a ninth capacitor 13, wherein the second direct current 6 flows to the second contact piece 3 through the seventh capacitor 15, passes through the other end of the fifth inductor 9, is connected with the eighth capacitor 14 and the ninth capacitor 13, and then flows to the second contact piece 3.
The third contact piece 2 (negative contact piece) is connected in series with a capacitance-inductance circuit, and the capacitance-inductance circuit comprises: a third contact 2, a sixth inductor 8 and a common-end circuit 5, wherein the current of the third contact 2 flows into the common-end circuit 5 through the other end of the sixth inductor 8.
In the second-stage electromagnetic shielding system, the first contact piece 1 is grounded through a fourth capacitor 12, a fifth capacitor 11 and a sixth capacitor 10 through a second shell B, and the second contact piece 3 is grounded through a seventh capacitor 15, a second capacitor 19 and a ninth capacitor 13 through the second shell B; spark quenching of the first contact 1 (low-speed contact) is absorbed by the fourth capacitor 12, the fifth capacitor 11 and the sixth capacitor 10, and spark quenching of the second contact 3 (high-speed contact) is absorbed by the seventh capacitor 15, the second capacitor 19 and the ninth capacitor 13, so that redundant energy in a circuit in the commutation process of the commutator is absorbed.
As shown in fig. 5, in the present embodiment, the first casing a is enclosed by an aluminum turbine casing and a metal cover plate, wherein the aluminum turbine casing and the metal cover plate can be connected by a detachable connection manner, such as a bolt-nut assembly.
Wherein the first level shielding system is placed in the first enclosure A.
The second level shielding system is placed in the second housing B.
The method comprises the steps that induced potential pulses on a high-speed carbon brush, a low-speed carbon brush and a reversing contact piece are restrained from interfering with the outside through a two-stage electromagnetic shielding system, and induced potentials at the starting and stopping moments of a wiper and at the rotating contact moment of the contact piece are eliminated; the first shell and the second shell can isolate electromagnetic radiation generated by rotary contact of the contact piece in the starting and stopping moments of the motor and in the running process. Therefore, the method has good market application prospect.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (10)
1. The utility model provides a multistage shielding system of wiper motor EMC which characterized in that includes:
a first level shielding system, comprising: the first carbon brush is connected with the capacitor-inductor circuit in series, the second carbon brush is connected with the capacitor-inductor circuit in series, and the third carbon brush is connected with the inductor circuit in series; the first stage shielding system is grounded through the first shell;
a second level shielding system, comprising: the first contact piece is connected with the capacitance-inductance circuit in series, the second contact piece is connected with the capacitance-inductance circuit in series, and the third contact piece is connected with the capacitance-inductance circuit in series; the second stage shield system is grounded through a second enclosure connected to the first enclosure.
2. The wiper motor EMC multi-stage shielding system of claim 1, wherein the first carbon brush in series capacitance-inductance circuit comprises: first direct current flows to in proper order first inductance, behind the first electric capacity and through first shell ground connection.
3. The wiper motor EMC multi-stage shielding system according to claim 1 or 2, wherein the second carbon brush in series capacitor-inductor circuit comprises: the second direct current flows to the second inductor and the second capacitor in sequence and then is grounded through the first shell.
4. The wiper motor EMC multi-stage shielding system according to claim 1 or 2, wherein the third carbon brush in series capacitor-inductor circuit comprises: the circuit comprises a third inductor and a common terminal circuit, wherein the common terminal circuit passes through the third inductor and is connected with a second contact piece.
5. The wiper motor EMC multi-stage shielding system according to claim 1 or 2, wherein the first housing is enclosed by an aluminum turbine housing and a metal cover plate.
6. The wiper motor EMC multi-stage shielding system according to claim 1 or 2, characterized in that the first stage shielding system is placed in the first housing.
7. The wiper motor EMC multi-stage shielding system of claim 1, wherein the first contact in series capacitance-inductance circuit comprises: the direct current flows to the first contact piece after passing through the fourth capacitor and then passing through the other end of the fourth inductor and then being connected with the fifth capacitor and the sixth capacitor.
8. The wiper motor EMC multi-stage shielding system according to claim 1, 2 or 7, wherein the second contact in series capacitance-inductance circuit comprises: the second direct current flows to the second contact piece after passing through the seventh capacitor and then being connected with the eighth capacitor and the ninth capacitor through the other end of the fifth inductor.
9. The wiper motor EMC multi-stage shielding system according to claim 1, 2 or 7, wherein the third contact in series capacitance-inductance circuit comprises: the current of the third contact passes through the other end of the sixth inductor and then flows into the common-end circuit.
10. The wiper motor EMC multi-stage shielding system according to claim 1, 2 or 7, characterized in that the second stage shielding system is placed in the second housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121544201.XU CN215682073U (en) | 2021-07-07 | 2021-07-07 | Windscreen wiper motor EMC multistage shielding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121544201.XU CN215682073U (en) | 2021-07-07 | 2021-07-07 | Windscreen wiper motor EMC multistage shielding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215682073U true CN215682073U (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121544201.XU Active CN215682073U (en) | 2021-07-07 | 2021-07-07 | Windscreen wiper motor EMC multistage shielding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215682073U (en) |
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2021
- 2021-07-07 CN CN202121544201.XU patent/CN215682073U/en active Active
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