Circuit for shielding electro-magnetic wave noise radiated and conducted from wiper motor

• US 5,309,052 A
• Filed: 05/21/1993
• Issued: 05/03/1994
• Est. Priority Date: 06/04/1992
• Status: Expired due to Fees

• Current Assignee: Asia Motors Co. Ltd. (Kia Corp.)
• Original Assignee: Asia Motors Co., Inc.
• Inventors: Kim, Kwi-Ju
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): NGUYEN, MATTHEW VAN
• Application Number:
  US08/065,340
• Time in Patent Office: 347 Days
• Field of Search: 310/51, 310/40 MM, 174/35 R, 174/35 MS, 361/424, 219/10.55 R, 219/10.55 D, 181/198, 181/200, 181/202
• US Class Current: 310/51
• CPC Class Codes: H02K 11/0141 Shields associated with casings, enclosures or brackets
• CPC Class Codes: H02K 11/02 for suppression of electromagnetic interference
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus
• CPC Class Codes: H05K 9/0066 Constructional details of transient suppressor

Abstract

A circuit for shielding an electro-magnetic wave noise radiated and conducted from a wiper motor is disclosed. The circuit absorbs, shields or suppresses such electro-magnetic wave noise when the wiper motor is activated to drive the wiper under a particular weather condition such as rain or snow. The different components of the electro-magnetic wave noise are absorbed or suppressed by different circuit components, so that the electro-magnetic noise could not reach safety devices of the automobile. Therefore accidents can be prevented, and riders can be protected.

Claims

1. A circuit for shielding an electro-magnetic wave noise radiated from or conducted by a wiper motor (M), comprising:

a wiper motor case (10) for shielding and absorbing electro-magnetic wave noise radiated and conducted from said wiper motor (M) therein, said motor case (10) being grounded, a first wire drawing hole in said motor case for drawing conductive wires from said wiper motor (M), a residue space of said first wire drawing hole after drawing said wires being sealed with a noise absorbing material such as a ferrite sealing bond or an elastomer sealing gasket;

a shielding case (20) for shielding and absorbing electro-magnetic wave noise radiated and conducted from said wiper motor case (10), a second wire drawing hole in said shielding case, a residue space of said second wire drawing hole being sealed with a noise absorbing material such as a ferrite sealing bond or an elastomer sealing gasket; and

a wire filter wire (W) including a set of copper core wires (30) for damping the conducting electro-magnetic wave noise and connected to the respective conductive wires drawn from said shielding case (2), and incombustible Teflon cladding materials (40 and 40'"'"') and an noise absorbing member (50) surrounding said core wires (30), wherein said wiper motor case (10) which shields and absorbs the electro-magnetic wave noise includes;

a plurality of ceramic capacitors (C1-C3) connected to respective brushes of said wiper motor for absorbing for the first time the conducted electro-magnetic noise of the microwave band to convert the noise to a thermal energy;

and ferrite beads (F1 and F2) for shielding a part of the conducted electro-magnetic wave noise to convert it to a thermal energy.

2. A circuit for shielding an electro-magnetic wave noise radiated from or conducted by a wiper motor (M), comprising:

a wiper motor case (10) for shielding and absorbing electro-magnetic wave noise radiated and conducted from said wiper motor (M) therein, said motor case (10) being grounded, a first wire drawing hole in said motor case for drawing conductive wires from said wiper motor (M), a residue space of said first wire drawing hole after drawing said wires being sealed with a noise absorbing material such as a ferrite sealing bond or an elastomer sealing gasket;

a shielding case (20) for shielding and absorbing electro-magnetic wave noise radiated and conducted from said wiper motor case (10), a second wire drawing hole in said shielding case, a residue space of said second wire drawing hole being sealed with a noise absorbing material such as a ferrite sealing bond or an elastomer sealing gasket; and

a wire filter line (W) including a set of copper core wires (30) for damping the conducting electro-magnetic wave noise and connected to the respective conductive wires drawn from said shielding case (2), and incombustible Teflon cladding materials (40 and 40'"'"') and a noise absorbing member (50) surrounding said core wires (30), wherein said shielding case (20) which shields and absorbs the electro-magnetic wave noise includes;

a plurality of ferrite cores (F3) drawn out from said motor case (10), with said conductive wires wound thereon many times for absorbing and suppressing the electro-magnetic wave noise of a wide band conducted through said conductive wires;

noise filters consisting of inductive components (L1-L4) and conductive components (C4 and C5) for absorbing and suppressing the electro-magnetic wave noise of the microwave band; and

a plurality of electrolytic capacitors (C6-C8) connected to one of said noise filters (F4) of a high speed line (H) in parallel, and also connected to a bias line B+, and for absorbing the electro-magnetic wave noise of a low band to convert it to a thermal energy, said high speed and bias lines (H and B+) being in said conductive wires.