Motor Insulator Terminal Arrangement for Noise Reduction
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Solution Overview
Problem
Conventional wiper motors with closely spaced input terminals and a separate ground terminal can cause radiation noise due to the longer distance of twisted electrical wires to the point where they start to twist, leading to increased noise emission.
Innovation Solution
An insulator with multiple electrical conductors connected to the motor's terminals, where the main body is made of insulating material and the conductors' ends are arranged adjacent to each other, intersecting with the motor's output shaft direction, reducing the length of untwisted wire and thus minimizing radiation noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the ground terminal is disposed at a different location from the input terminals, then the terminal arrangement flexibility is improved, but the radiation noise increases due to longer untwisted wire sections
Solution Approach 1:
The patent merges the ground terminal and input terminals into a single integrated terminal unit structure. The terminal unit includes a terminal case with through-holes where both ground terminals and input terminals are disposed in close proximity, allowing electrical wires to be twisted together immediately at the terminal connection point. This merging eliminates the separate location arrangement that causes long untwisted wire sections, thereby reducing radiation noise while maintaining terminal arrangement flexibility.
2Object-generated harmful factors
If the electrical wires are twisted together immediately at the terminals, then the radiation noise is reduced, but the terminal structure complexity increases
Solution Approach 1:
The terminal unit structure serves multiple functions simultaneously: it provides mechanical support for both ground terminals and input terminals, enables immediate wire twisting to reduce radiation noise, and offers a standardized mounting interface for the motor. The terminal case with through-holes and recesses creates a universal structure that handles both terminal types in a single integrated component, avoiding the need for separate terminal structures and reducing overall complexity.
Solution Approach 2:
The patent employs a nested structure where the terminal case contains recesses that hold terminal holders, which in turn contain the actual terminals. The electrical wires are twisted within the terminal case structure, and the entire terminal unit is nested within the motor housing. This nested arrangement consolidates multiple components into a compact integrated unit, reducing structural complexity while enabling immediate wire twisting for noise reduction.
3Device complexity
If the two input terminals are disposed close to each other, then the wiring complexity is reduced, but the radiation noise increases when the ground terminal is at a different location
Solution Approach 1:
The patent merges the ground terminal and input terminals into a single integrated terminal unit structure. The terminal unit includes a terminal case with through-holes where both ground terminals and input terminals are disposed in close proximity, allowing electrical wires to be twisted together immediately at the terminal connection point. This merging eliminates the separate location arrangement that causes long untwisted wire sections, thereby reducing radiation noise while maintaining terminal arrangement flexibility.
Data Source
AI summary
An insulator includes a plurality of electrical conductors and a main body. One ends of the plurality of electrical conductors are electrically connected to a ground terminal or a plurality of input terminals of a motor. The main body includes an insulating material. Other ends of the plurality of electrical conductors are disposed adjacent to each other on the main body in a direction intersecting with a direction of an output shaft of the motor.