KR950001957B1 - Apparatus for shielding electro-magnetic wave noise radiated and conducted from wiper motor - Google Patents

Abstract

The apparatus is designed to shield the external electronic product and devices from noise of the wiper motor so that EMI noise is converted into thermal energy. The apparatus comprises; a motor case (10) covering a wiper motor (M); ceramic capacitors (C1-C4) absorbing EMI noise and converting it into thermal energy connected with the motor brush; a ferrite core (F3) and noise filters (F4,F5) as low frequency, high frequency, and bandpass frequency ranges; a shield case (20) secondary filtering the EMI from the cover (20); a filter wire (W) coated with a noise absorber (50).

Description

Shielding against electromagnetic radiation and conducted noise from wiper motors

1 is a device configuration diagram of the present invention.

2 is a block diagram of a wire filter lead of the present invention.

* Explanation of symbols for main parts of the drawings

C ₁ -C ₅ : Ceramic Capacitor C ₆ -C ₈ : Electrolytic Capacitor

F ₁ , F ₂ : Ferrite Beads F ₃ : Ferrite Cores

F ₄ , F ₅ : Noise filter W: Wire filter lead

10: motor case 20: shielding case

40, 40 ': flame retardant coating agent 50: noise absorber

The present invention prevents the occurrence of functional failures of other components and devices mounted and operated in a vehicle by electromagnetic noise radiated and conducted from the wiper motor assembly, and the interference of electromagnetic noise when the vehicle security component is driven electronically. The present invention relates to a shielding device against electromagnetic radiation and conducted noise of a wiper motor for protecting passengers and vehicles from the risk of an accident caused by a malfunction of a security component.

In general, when the operation switch is turned on to operate the wiper mounted on the vehicle under snow or rain weather conditions, the wiper is driven by the wiper motor. At this time, the electromagnetic noise radiated from the wiper motor may affect the anti-lock brake system or the automatic automatic transmission device, which is mounted on the vehicle, and the parts or the device may malfunction and malfunction. The likelihood of a safety accident due to a malfunction was very high. In other words, when driving the wiper of the vehicle is a bad weather condition, electromagnetic noise generated from the wiper motor may cause a failure of the vehicle or cause a large accident, which may result in passenger injury and loss of the vehicle. It is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and absorbs and shields electromagnetic waves radiated and conducted from a wiper motor, converts them into thermal energy, and flows them to the vehicle body of the vehicle, thereby affecting other electronic devices and components installed in the vehicle. Its purpose is to allow for the elimination of possible adverse effects.

In order to achieve the above object, the present invention primarily absorbs, blocks, and thermally converts electromagnetic wave noise of a wiper motor, which causes the malfunction of electronic equipment, in a wiper motor assembly to conduct a metal vehicle body, and a wiper Electromagnetic noise radiated and conducted from the assembly is transmitted to the vehicle body by secondary absorption, blocking, and heat conversion, and the wire drawn from the shielding case is composed of a wire filter lead to the wire driving switch to absorb residual noise. Characterized by shielding.

Hereinafter, the configuration of the present invention based on the drawings.

That is, the present invention seals the wire lead-out hole and the case seam of the wiper motor case 10 surrounding the wiper motor M with a noise absorbing material such as a ferrite sealing bond or an elastomeric sealing gasket, and thus the wiper motor M. It absorbs and cuts electromagnetic wave noise radiated from inside, and installs a plurality of ceramic capacitors (C ₁ -C ₃ ) connected to the wiper motor brush in the wiper motor case 10 so that the wiper mower is installed. Ferrite core (F ₃ ) and noise filter (F ₄ ) (F ₅ ) and the conductive wire absorbs the electromagnetic noise radiated through the brush and emits it as thermal energy, and is also drawn through the wiper motor case 10. Electrolytic capacitors (C ₆ ) (C ₇ ) (C ₈ ) are connected to each other to absorb and dissipate electromagnetic noise in a wide frequency band, a high frequency band, and a low frequency band, while the wiper Ferrite sealing bond or elastomer shield covering the entire case of the motor case 10, ferrite core (F ₃ ), noise filter (F ₄ ) (F ₅ ), electrolytic capacitor (C ₆ -C ₈ ) A shielding case 20 sealed with a noise absorbing material such as a gasket is installed to secondarily absorb and block electromagnetic noise radiated from the wiper motor case 10 from the wiper motor M when the wiper is operated. It can completely shield the electromagnetic noise from radiation conduction. The wiper motor case 10 and the shielding case 20 are installed to have a maximum ground area on the vehicle body of the vehicle, and the lead wires drawn from the shielding case 20 maximize the electromagnetic noise conducted as shown in FIG. A wire filter lead W composed of attenuated copper core wire 30, flame retardant Teflon coating 40, 40 ', and noise absorber 50 is used.

Ferrite beads F ₁ and F ₂ are provided in the lead-out hole of the wiper motor case 10 to block and thermally convert some electromagnetic wave noise.

The shielding case 20 is provided with a shielding circuit for complexly removing the electromagnetic noise, the ferrite core (F ₃ ) wound around a plurality of times in order to absorb and extinguish the electromagnetic noise of the optical wave band , Noise filters (F ₄ ) (F ₅ ) of inductive components (L ₁ -L ₄ ) and conductive components (C ₄ ) (C ₅ ) that absorb and dissipate electromagnetic noise in the high frequency band, and electromagnetic waves in the low frequency band Electrolytic capacitors (C ₆ -C ₈ ) are installed to absorb noise and thermally convert it. The ferrite core F ₃ is installed over the high speed wire H and the low speed wire L, and one noise filter F ₄ is the other low noise wire F ₅ of the high speed wire H. It is installed in parallel with (L). In addition, the shielding case 20 is provided with an electrolytic capacitor (C ₆ -C ₈ ) for removing the electromagnetic noise of the low frequency band, one electrolytic capacitor (C ₆ ) is a noise filter (H) installed in the high-speed wire (H) ( F ₄ ) is installed at the rear end, and the other two electrolytic capacitors (C ₇ ) (C ₈ ) are installed at the bias lead (B ⁺ ).

Referring to the effects of the present invention having such a configuration in detail as follows.

If the wiper motor (M) is operated at high speed or low speed through the wiper drive switch (WS), the battery (B) power is supplied to drive the wiper motor (M), and the wiper motor (M) brushes and turn Spark discharge noise caused by transient current between electrons, noise caused by contact resistance between brush and rotor, noise caused by pressure difference between brush and spring, noise caused by contact surface wear between brush and rotor Or conducted through the wire.

The electromagnetic noise as described above is first attenuated in the motor case 10, and the plurality of ceramic capacitors (C ₁ -C ₃ ) connected to each brush of the wiper motor (M) of the high frequency band (10MHz or more) Electromagnetic noise is absorbed, thermally converted and simultaneously bypassed to ground. In addition, electromagnetic noise conducted through the high speed wire H or the low speed wire L is blocked or extinguished through each ferrite bead F ₁ (F ₂ ) provided in the lead wire extraction hole of the motor case 10. Heat conversion. In addition, electromagnetic noise emitted from the wiper motor M is blocked and absorbed by the motor case 10 as a shielding member and bypassed to the ground. On the other hand, the lead-out hole formed in the motor case 10 drills the aperture to a minimum, and the lead-out hole and the case seam are sealed with a noise absorbing material such as a ferrite shielding bond or an elastomer shielding gasket to completely radiate electromagnetic noise. It can be shielded.

The ferrite core (F ₃ ) is installed in the high speed wire (H) or the low speed wire (L) drawn out from the motor case 10 to eliminate the electromagnetic wave noise of the spectral wave band (15MHz-30NHz). At this time, the high-speed line (H) or the low-speed line (L) through the ferrite core (F ₃ ), the noise filter (F ₁ ) of the inductive components (L _1- L ₄ ) and the conductive components (C ₄ ) (C ₅ ), respectively ₄ ) (F ₅ ) is provided so that the electromagnetic noise of the high frequency band (10 MHz or more) is attenuated and eliminated by the noise filter F ₄ (F ₅ ). In addition, the low frequency band (1 kHz or less) is achieved by the electrolytic capacitor C ₆ installed at the rear end of the noise filter F ₄ of the high speed conductor H and the electrolytic capacitor C ₆ -C ₈ provided at the bias conductor B ⁺ . The impulsive square wave noise of is bypassed.

In the present invention, the lead-out hole of the high-speed wire (H), the low-speed wire (L), the stop wire (S) and the bias lead (B ⁺ ) drawn out through the shield casing 20 is minimized, The seam is sealed with a ferrite shielding bond or noise absorbing material such as an elastomeric shielding gasket to make the ground area as large as possible to completely shield radiation electromagnetic noise. Lead wires drawn out of the shielding case 20 and connected to the wiper drive switch WS and the battery B power source are wrapped with a flame-retardant coating 40 on the core wire 30, which is a conductor, as shown in FIG. 2. By inserting a ferrite noise absorber 50 into the outside and forming a flame-retardant coating material 40 and 40 'on the outer side, it absorbs, blocks, and induces low-frequency conduction noise (1 kHz or less) conducted to the final conductor. The effect of the noise filter which absorbs the electromagnetic noise of a component and a conductive component can be acquired.

As such, the present invention completely attenuates and excludes electromagnetic noise radiated and conducted from the wiper motor M through primary, secondary, and tertiary phases, thereby preventing personal injury and vehicle loss from accidents. It will provide an effect.

Claims (3)

In the vehicle wiper motor driving device, electromagnetic wave radiated and conducted in the wiper motor (M) by sealing the conductor lead-out hole and the case seam of the wiper motor case (10) surrounding the wiper motor (M) with a noise absorbing material. Blocks the primary absorption of the noise, and installs a plurality of ceramic capacitors (C ₁ -C ₃ ) connected to the wiper motor brush in the wiper motor case 10 to prevent electromagnetic noise conducted through the wiper motor brush. Absorbs and converts the thermal energy into thermal energy, and a ferrite core (F ₃ ), a noise filter (F ₄ ) (F ₅ ), and an electrolytic capacitor (C ₆ -C ₈ ) are connected to the lead wire drawn out through the wiper motor case 10. By connecting and absorbing and extinguishing electromagnetic noise of the optical wave band, the high frequency band and the low frequency band, the wiper motor case 10, the ferrite core (F ₃ ), the noise filter (F ₄ ) (F ₅ ), electrolytic condensation By installing the shielding case 20 which encloses the book C ₆ -C ₈ as a whole, the electromagnetic wave noise radiated from the wiper motor case 10 is blocked by secondary absorption, and drawn out from the shielding case 20. The conductive wire is composed of a wire filter lead (W) coated with a double flame retardant Teflon coating (40, 40 ') interposed with a noise absorber (50) to absorb electromagnetic noise of inductive and conductive components. A shield against electromagnetic radiation and conducted noise of a wiper motor. The method of claim 1, wherein the ferrite bead (F ₁ ) (F ₂ ) is provided in the lead-out hole of the wiper motor case 10 to which the wiper motor (M) lead is drawn out to remove some electromagnetic noise conducted through the lead. Shielding against electromagnetic radiation and conduction noise of a wiper motor, characterized by absorbing and causing thermal conversion. According to claim 1, Ferrite core (F ₃ ) for absorbing the electromagnetic wave noise of the optical wave band is installed on the conductive wire drawn from the shielding case 20, and at the same time high-speed wire (H) drawn from the ferrite core (F ₃ ) ) And the noise filter (F ₄ ) (F ₅ ) of the inductive component (L ₁ -L ₄ ) and the conductive component (C ₄ ) (C ₅ ) absorbing the electromagnetic noise of the high frequency band to the low-speed wire (L) Electromagnetic capacitors (C ₆ -C ₈ ) for absorbing and thermally converting low-frequency electromagnetic wave noise in high-speed wires (H) and bias wires (B ⁺ ) are installed. Shielding against noise.