Current Detection Device Vibration Fixing Wiring Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bus bar type shunt resistors are prone to vibration, which affects the accuracy and reliability of current detection due to the transmission of vibrations to the joint between the resistor body and wiring members, leading to potential detection errors.
Innovation Solution
A current detection device with a resistor body made of a metal material having a lower temperature coefficient of resistance, joined between two conductive metal wiring members, and a fixing member to absorb vibrations, reducing the impact on the joint and enhancing accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bus bar is configured as a long size shunt resistor, then the current detection function is achieved, but vibration is generated and transmitted to the joint, causing detection errors
Solution Approach 1:
The patent introduces a vibration absorbing member positioned between the wiring member and the resistor body to absorb vibrations before they reach the joint. This beforehand cushioning prevents vibration transmission that would otherwise cause detection errors, while maintaining the long bus bar configuration for current detection functionality.
2Reliability
If the resistor body is joined with wiring members, then current detection is enabled, but vibration is transmitted to the joint, influencing measurement accuracy
Solution Approach 1:
The vibration absorbing member serves as an intermediary element between the wiring member and the resistor body. It mediates the connection by absorbing vibrations while allowing the electrical connection to function, thus preventing vibration transmission to the joint and eliminating detection errors caused by vibration.
3Ease of manufacture
If screw fastening or soldering is used to fix the shunt resistor, then connection is achieved, but heat generation occurs due to contact resistance
Solution Approach 1:
The patent merges the connection portions of the wiring members with the resistor body to form an integrated structure. This merging eliminates separate connection interfaces that would generate heat through contact resistance, thereby reducing energy loss while maintaining manufacturing ease through the integrated design.
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
The solution effectively minimizes the influence of vibrations on the joint, allowing for accurate and reliable current measurement by combining the bus bar and shunt resistor functions in a single device with reduced parts, preventing error voltage generation.
Implementation Method 1
a resistor body consisting of a metal material having a lower temperature coefficient of resistance than those wiring members
Implementation Method 2
a fixing member formed between any one of connection portions formed in the first and second wiring members and the joint with the resistor body
Data Source
AI summary
Provided is a current detection device that enables to eliminate the influence of vibration that is applied to a bus bar, which is configured as a shunt resistor and measures current with high accuracy and high reliability. The current detection device is provided with a first wiring member and a second wiring member consisting of a conductive metal material, and a resistor body consisting of a metal material having a lower temperature coefficient of resistance than those wiring members and is joined between the first wiring member and the second wiring member, wherein a connection portion for making a connection to another wiring member or device is formed at an end of the first wiring member and second wiring member, the end being an opposite side from a joint with the resistor body, and a fixing member is provided between the connection portion and the joint with the resistor body.