Motor Ground Wire Connection Structure with Press-Fit Pin
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Solution Overview
Problem
Conventional ground wire connection structures for motors with small radial dimensions face challenges in ensuring workability, reliability, and low ground resistance, as they often have the ground wire connection distant from the power wire connection, compromising ease of assembly and electrical conductivity.
Innovation Solution
A ground wire connection structure comprising a conductive frame, flange, and pin with a press-fit and solder cup configuration, where the conductive pin is press-fitted into a through hole of the flange and the ground wire is inserted into the solder cup, ensuring reliable electrical connection and low resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground wire connection is placed distant from the power wire connection to ensure workability and reliability, then the ease of assembly and electrical conductivity deteriorate
Solution Approach 1:
The patent combines the ground wire connection and power wire connection into a single integrated connector structure. The connector includes both a ground wire insertion hole and power wire insertion holes, allowing both connections to be made at the same location on the fan housing, thus improving ease of assembly while maintaining reliability through proper electrical isolation and grounding.
2Device complexity
If the ground wire connection structure is simplified for motors with small radial dimensions, then the manufacturing complexity reduces, but the ground resistance may increase
Solution Approach 1:
The patent introduces a conductive connector as an intermediary element that provides a reliable ground connection path. The connector includes a ground wire insertion hole that establishes electrical contact with the fan housing, serving as a mediator between the ground wire and the motor frame, ensuring low ground resistance even in compact motor designs.
3Ease of operation
If a press-fit structure is used for the conductive pin, then the assembly workability improves, but the connection reliability may deteriorate
Solution Approach 1:
The patent incorporates a press-fit structure in the conductive pin that is pre-formed during manufacturing. The press-fit portion is already configured to engage with the connector, allowing for easy assembly while maintaining reliable electrical connection. This preliminary preparation of the press-fit structure ensures both workability and connection reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances workability, reliability, and reduces ground resistance in motors with small radial dimensions by allowing for efficient assembly and maintaining high conductivity across the connection points.
Implementation Method 1
a press-fit portion press-fitted and fixed into the through hole
Implementation Method 2
a solder cup protruded from the diameter-increased head portion to allow an exposed tip end of a ground wire to be inserted and joined into the inside
Data Source
AI summary
A ground wire connection structure for a motor includes: a frame that has electrical conductivity; a flange that is integrated with the frame on one axial end surface of the frame and has electrical conductivity; a protrusion that is protruded outward from a flange surface of the flange and has a through hole; and a conductive pin that has a press-fit portion press-fitted and fixed into the through hole, a diameter-increased head portion, and a solder cup protruded from the head portion to allow an exposed tip end of a ground wire to be inserted and joined into the inside.