Current Sensor Shield Alignment via Support Part
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Solution Overview
Problem
Current current sensors face misalignment issues due to variations in shield adhesive formation and manufacturing errors, leading to degraded electromagnetic noise restriction and detection accuracy.
Innovation Solution
A current sensor design incorporating a wiring board with a magnetoelectric converter, a shield, and an insulating sensor housing, where the shield is mounted on a shield support part with a shield adhesive, aligning the shield and wiring board to prevent misalignment and enhance electromagnetic noise restriction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If shield adhesive is used to mount the shield, then the shield can be fixed to the sensor housing, but misalignment occurs due to variations in adhesive formation and manufacturing errors
Solution Approach 1:
A shield support part is introduced as an intermediary component between the shield and the sensor housing. This support part includes a contact surface for mounting the shield and an adhesion surface for bonding to the housing, separating the fixation function from the alignment function and reducing the impact of adhesive variations on alignment precision
Solution Approach 2:
The mounting structure is segmented into distinct functional zones: a contact surface area for shield attachment and an adhesion surface area for housing bonding. This segmentation allows each surface to be optimized independently, with the contact surface designed for precise shield positioning and the adhesion surface for strong housing attachment
2Object-affected harmful factors
If the shield is mounted close to the wiring board, then electromagnetic noise restriction is improved, but misalignment degrades the noise restriction function
Solution Approach 1:
The shield support part acts as a mediator that ensures precise positioning of the shield relative to the wiring board. By providing a dedicated contact surface with controlled geometry, it maintains the optimal spacing and alignment between the shield and wiring board, preventing misalignment that would degrade electromagnetic noise restriction
Solution Approach 2:
The shield support part is pre-formed with specific geometric features that establish the correct position and orientation of the shield before final assembly. This preliminary structuring of the mounting interface ensures that the shield is automatically positioned correctly relative to the wiring board, eliminating alignment errors
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 design effectively suppresses misalignment and degradation of the shield's noise restriction function, thereby maintaining detection accuracy of the measured current.
Implementation Method 1
The wiring board has a magnetoelectric converter thereon, and the magnetoelectric converter is configured to convert a measurement magnetic field caused by a flow of a measurement current into an electric signal
Implementation Method 2
The shield is disposed to restrict an electromagnetic noise into the magnetoelectric converter
Implementation Method 3
The shield adhesive bonds the sensor housing and the shield together
Data Source
AI summary
A current sensor includes a wiring board, a shield, an insulating sensor housing, and a shield adhesive. The wiring board and the shield are accommodated in the sensor housing. The sensor housing has a shield support part to support the shield, and a shield adhesion part. An application surface of the shield adhesion part is further from the shield than a contact surface of the shield support part. The shield is mounted on the contact surface of the shield support part, and the shield adhesive is disposed between the application surface of the shield adhesion part and the shield. The shield and the wiring board are aligned with and spaced from each other in the sensor housing.