PCB Coil Connection Structure for High-Temperature Coriolis Sensors
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Solution Overview
Problem
Coriolis flow meters face challenges in high-temperature applications where the connection between the coil apparatus and contact-making elements in vibration sensors and exciters tends to detach due to mechanical forces, leading to unreliable electrical contacts.
Innovation Solution
A printed circuit board coil apparatus with a positive-locking connection mechanism using a connection element with a hole and metal micro-particle paste for secure mechanical and electrical bonding, preventing detachment under tensile forces, and enhancing the sensitivity of the magnetic field interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a welding process is used to connect connection elements to contact-making elements, then electrical connection is achieved, but the connection elements detach under mechanical forces during mounting
Solution Approach 1:
The connection system is divided into distinct components: a contact-making element with a hole, a separate connection element, and metal micro-particle paste. This segmentation allows each component to fulfill its specific function - the hole provides mechanical anchoring, the connection element provides electrical conductivity, and the paste enhances bonding - thereby resolving the contradiction between electrical connection reliability and mechanical strength.
Solution Approach 2:
Metal micro-particle paste is introduced as an intermediary substance between the connection element and the contact-making element. This paste fills the hole and creates a strong mechanical and electrical bond, mediating the connection between the two components and preventing detachment under mechanical forces while maintaining electrical conductivity.
2Reliability
If conventional coil winding onto cylindrical bobbins is used, then coil structure is achieved, but insulation between conductor tracks and high winding density are difficult to maintain at medium temperatures
Solution Approach 1:
The conventional mechanical coil winding process onto cylindrical bobbins is replaced with a printed circuit board-based coil structure. The conductor tracks are directly patterned onto the PCB substrate, eliminating the need for separate bobbins and winding operations. This substitution provides inherent insulation through the PCB material and achieves high winding density through precise trace routing, thereby resolving the contradiction between insulation reliability and structural complexity at elevated temperatures.
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 ensures reliable and stable electrical connections in high-temperature environments by preventing the detachment of connection elements, maintaining contact integrity under mechanical stress and improving the sensitivity of the coil apparatus to magnetic field changes.
Implementation Method 1
the coil is configured to detect or generate a time-varying magnetic field
Implementation Method 2
the magnetic apparatus and the coil apparatus of an vibration exciter or vibration sensor are configured to interact with one another by means of magnetic fields
Data Source
AI summary
Disclosed is a measuring sensor of a measuring device for detecting a mass flow rate. The measuring sensor comprises a measuring tube, a vibration exciter, and at least two vibration sensors. The vibration exciter and the vibration sensors each have a coil apparatus having at least one coil and at least one magnetic apparatus. The coil apparatus comprises a printed circuit board having at least one printed circuit board layer, wherein the coil is formed by means of an electrically conductive conductor track, wherein the coil is arranged on the first side and/or second side of a printed circuit board layer, wherein the printed circuit board comprises at least two contact-making elements for connecting the coil to an electronic measuring and/or operating circuit of the measuring device by means of connection elements, and is characterized in that at least one contact-making element has a hole.