Electric Current Sensor Wiring Bundle for Magnetic Flux Error Reduction
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Solution Overview
Problem
Existing electric equipment, including Hall elements and other detection elements, suffer from detection errors due to the influence of leakage magnetic flux from magnetic field generation sources, such as reactors, which is not adequately addressed in current technologies.
Innovation Solution
The electric equipment incorporates a cylindrical non-metallic member to bundle the reference voltage line, output signal line, and ground line together, ensuring they are routed inside a casing near the reactor, thereby experiencing equal influence from the magnetic field and reducing detection errors, and allows for common use of these lines to simplify the structure and reduce heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wiring lines are positioned around a magnetic field generation source (reactor), then the structure is simple and easy to route, but the wiring lines are influenced by leakage magnetic flux causing detection errors
Solution Approach 1:
The patent merges the reference voltage line, output signal line, and ground line into a single bundled structure. This combining of multiple lines into one integrated bundle allows them to be routed together near the reactor while maintaining consistent exposure to magnetic fields, thereby reducing detection errors caused by magnetic flux leakage.
Solution Approach 2:
The patent applies the equipotentiality principle by ensuring all signal lines (reference voltage line, output signal line, and ground line) are positioned at equivalent positions relative to the magnetic field source. By bundling them together, they experience equal magnetic field influence, which compensates for the interference and maintains measurement precision.
2Ease of manufacture
If multiple lines are routed separately, then each line can be optimized independently, but the structure becomes complex and heat generation increases
Solution Approach 1:
The patent combines multiple separate wiring lines (reference voltage line, output signal line, ground line) into a single bundled structure. This merging reduces the overall structural complexity and minimizes the number of separate routing paths, thereby reducing heat generation from multiple independent conduits while maintaining optimal positioning near the reactor.
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 effectively suppresses detection errors in electric current sensors by evenly applying the magnetic field influence across the bundled lines, simplifies the equipment structure, and reduces heat generation, even at high switching frequencies.
Implementation Method 1
the reference voltage line, the output signal line, and the ground line are bundled together by a cylindrical member which does not contain metal... even if the three lines are influenced by a variable magnetic field around the reactor, the influence is equally applied to each of the three lines
Data Source
AI summary
An electric current sensor of electric equipment includes a detection element, a reference voltage line to which a reference voltage signal is transmitted, an output signal line to which an output signal of the detection element is transmitted, and a ground line connected to a ground potential. The reference voltage line, the output signal line, and the ground line are bundled together by a cylindrical member which does not contain metal, and in this state, the reference voltage line, the output signal line, and the ground line are routed inside a casing containing a reactor, and connected to a control device.