Current Sensor Magnetic Shielding for Leakage Field Reduction
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Solution Overview
Problem
Current current sensors face issues with leakage magnetic fields due to magnetic saturation, which can affect the accuracy of current detection, especially when large currents are involved and magnetic shields are not properly aligned or coupled.
Innovation Solution
The current sensor design incorporates at least two magnetic shields with recessed surfaces and coupling portions to reduce leakage magnetic fields, ensuring that magnetic flux is directed away from the detection element and preventing magnetic saturation from interfering with the electromagnetic conversion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetic shields are arranged adjacently in multiple phases, then the current sensor can detect current in multiple phases, but leakage magnetic field is generated from the end of the magnetic plate affecting detection accuracy
Solution Approach 1:
A magnetic field exchanger is introduced as an intermediary component between adjacent magnetic shields in different phases. This magnetic field exchanger mediates the magnetic field interaction, allowing the magnetic field to be exchanged between shields while preventing leakage magnetic fields from affecting adjacent phases, thus maintaining both multi-phase detection capability and measurement precision
Solution Approach 2:
The magnetic field exchanger is nested within the structure of adjacent magnetic shields, creating a hierarchical arrangement where the exchanger is positioned between the shields. This nested configuration enables the magnetic field exchanger to effectively manage magnetic field interactions while maintaining the compact multi-phase sensor structure
2Ease of manufacture
If magnetic shields are separated between phases, then manufacturing and assembly are simplified, but magnetic saturation causes leakage magnetic field that affects electromagnetic conversion element
Solution Approach 1:
The magnetic field exchanger serves as a mediator between separated magnetic shields, enabling controlled magnetic field exchange while preventing leakage magnetic fields caused by magnetic saturation from reaching the electromagnetic conversion element. This maintains the manufacturing simplicity of separated shields while eliminating the harmful leakage effect
Solution Approach 2:
The magnetic field exchanger converts the potentially harmful leakage magnetic field from magnetic saturation into a beneficial controlled magnetic field exchange between shields. By providing a designated path for magnetic field exchange, the harmful leakage is transformed into a useful function that maintains shield separation while protecting the detection element
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 design effectively reduces leakage magnetic fields, enhancing the accuracy of current detection by minimizing interference from magnetic saturation and improving the overall performance of the current sensor.
Implementation Method 1
a magnetic detection element that senses a magnetic flux generated from a current path to perform electromagnetic conversion
Implementation Method 2
at least two magnetic shields that are arranged around the magnetic detection element and shield an external magnetic flux affecting the magnetic detection element
Data Source
AI summary
A current sensor includes a magnetic detection element that senses a magnetic flux generated from a current path to perform electromagnetic conversion, and at least two magnetic shields that are arranged around the magnetic detection element and shield an external magnetic flux affecting the magnetic detection element. The at least two magnetic shields include a first magnetic shield and a second magnetic shield facing each other across the magnetic detection element and the current path. At least one of the first magnetic shield and the second magnetic shield includes at least two base portions and a coupling portion coupling the at least two base portions. The at least one of the first magnetic shield and the second magnetic field has a recess recessed from a periphery in a surface facing the other of the first magnetic shield and the second magnetic shield.