Segmented Shield Plates for Current Detection Devices
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Solution Overview
Problem
Current detection devices face accuracy issues due to deformation of the casing and cover caused by temperature rises, leading to varying distances between detection elements and bus bars, which results in magnetic saturation and decreased detection accuracy.
Innovation Solution
A current detection device design featuring a casing and cover with integral first shield plates and separate second shield plates that maintain consistent distances between magnetic sensors and bus bars, preventing deformation and magnetic saturation, even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the bus bar size is increased to handle larger currents, then the current carrying capacity is improved, but the temperature rise and subsequent deformation of the casing and cover increase
Solution Approach 1:
The shield plate is divided into multiple segments separated by slits, which prevents magnetic saturation while allowing thermal expansion. The segmentation allows each segment to independently respond to temperature changes without causing overall deformation of the casing and cover.
Solution Approach 2:
The shield plate has different structural characteristics in different regions - the main body provides magnetic shielding while the slit portions provide thermal relief. This local differentiation allows the shield plate to simultaneously achieve magnetic shielding function and thermal expansion accommodation.
2Object-affected harmful factors
If the shield plate size is increased to improve magnetic shielding, then the shielding performance is improved, but the risk of magnetic saturation increases
Solution Approach 1:
The shield plate is segmented into multiple portions by slits, which divides the magnetic flux path and prevents saturation in any single region while maintaining overall shielding effectiveness. The segmentation allows the shield plate to handle higher currents without magnetic saturation.
Solution Approach 2:
The shield plate has differentiated regions where the main body provides strong magnetic shielding while the slit portions create magnetic relief zones. This local quality differentiation allows the shield plate to maintain shielding performance while preventing magnetic saturation in high-current regions.
3Measurement precision
If the detection element is positioned closer to the bus bar to improve detection sensitivity, then the detection accuracy is improved, but the susceptibility to deformation-induced distance changes increases
Solution Approach 1:
The shield plate segmentation creates multiple independent regions that maintain stable distances from the detection element. The slits prevent deformation propagation, ensuring that the detection element maintains consistent positioning even when thermal expansion occurs in other regions.
Solution Approach 2:
The shield plate acts as an intermediary structure that maintains stable geometric relationships between the detection element and bus bar. The slit portions of the shield plate serve as thermal expansion joints that prevent deformation from affecting the critical detection element positioning.
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 ensures high accuracy in current detection by maintaining consistent distances and preventing magnetic saturation, thus maintaining detection precision even under high current conditions.
Implementation Method 1
a plurality of magnetic sensors each configured to detect a magnetic field generated when the current to be measured flows through the bus bar
Data Source
AI summary
In a current detection device, a first shield plate is disposed adjacent to a magnetic sensor and a second shield plate is disposed adjacent to the bus bar so that the first and second shield plates sandwich the bus bar and the magnetic sensor in the thickness direction of the bus bar. A plurality of the first shield plates adjacent to the magnetic sensors are an integral part of a cover. At least part of the cover is separated between adjacent two of the first shield plates, and a plurality of the second shield plates disposed adjacent to the bus bars are an integral part of a casing.