Electromagnetic Balance Yoke Recess for Fast Temperature Sensor Mounting
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Solution Overview
Problem
Conventional methods for attaching a temperature sensor to an electromagnetic unit in an electronic balance are time-consuming and labor-intensive, requiring overnight curing of a heat-conductive resin.
Innovation Solution
An electronic balance design that includes a sensor accommodating recess on the yoke, allowing easy attachment of a temperature sensor via a flexible board with a sensor attaching portion, and optionally using a support member and shield film to connect to an A/D converter, with the sensor accommodated in the recess and secured by screws or adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor is attached to the electromagnetic unit using a heat-conductive resin in a circular hole, then the temperature sensor can detect the magnet temperature, but the attachment process requires overnight curing and is time-consuming
Solution Approach 1:
The sensor accommodating recess is pre-formed on the yoke surface, and the sensor attaching portion is pre-integrated onto the flexible board. This preliminary preparation eliminates the need for overnight curing during final assembly, as the sensor can be directly attached using the pre-configured recess and attaching portion structure.
Solution Approach 2:
The attachment structure is divided into separate functional components: the sensor accommodating recess in the yoke, the flexible board with sensor attaching portion, and the lead wire portion. This segmentation allows each component to be optimized independently and assembled quickly without requiring complex curing processes.
2Reliability
If the temperature sensor is attached directly to the magnet or via the yoke using conventional methods, then the temperature can be detected, but the attachment process is labor-intensive and complex
Solution Approach 1:
The temperature sensor, sensor attaching portion, and lead wire portion are merged into a single integrated flexible board assembly. This combination simplifies the manufacturing process by reducing the number of separate components that need to be handled and attached, making the overall process less labor-intensive while maintaining detection accuracy.
Solution Approach 2:
The flexible board acts as an intermediary component that connects the temperature sensor to the A/D converter while providing a dedicated sensor attaching portion for secure mounting on the yoke. This intermediary structure simplifies the attachment process by providing a pre-configured interface between the sensor and the electromagnetic unit.
3Ease of manufacture
If the temperature sensor is attached using conventional methods without a dedicated recess, then the attachment can be simpler, but the sensor may be exposed to electromagnetic interference
Solution Approach 1:
The temperature sensor is nested within the sensor accommodating recess formed on the yoke surface. This nesting structure provides physical protection and shielding for the sensor against electromagnetic interference from the magnet and coil, while the recess itself is simple to form and does not complicate the manufacturing process.
Solution Approach 2:
The sensor accommodating recess provides localized shielding and protection specifically at the sensor location, where electromagnetic interference is most problematic. This localized approach protects the sensitive sensor without requiring complex shielding throughout the entire electromagnetic unit, maintaining manufacturing simplicity.
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
Facilitates quick and efficient attachment of the temperature sensor, improving temperature detection accuracy and reducing electromagnetic interference, while meeting stringent EMC standards.
Implementation Method 1
a temperature sensor configured to detect a temperature of the electromagnetic unit
Implementation Method 2
an electromagnetic unit including a force coil, a magnet, and a yoke... a coil disposed in a magnetic field of the magnet, and configured to achieve a balance with a load of a to-be-weighed object by supplying a current to the coil
Implementation Method 3
an electromagnetic unit including a force coil, a magnet, and a yoke... a coil disposed in a magnetic field of the magnet
Data Source
AI summary
An electronic balance includes an electromagnetic unit including a yoke with a magnet disposed inside, and configured to achieve a balance with a load of a to-be-weighed object by supplying a current to a coil disposed in a magnetic field of the magnet, and a temperature sensor configured to detect a temperature of the electromagnetic unit, wherein the temperature sensor is attached to a flexible board including a sensor attaching portion to which the temperature sensor is attached and a lead wire portion configured to connect the temperature sensor to an A/D converter, a sensor accommodating recess capable of accommodating the temperature sensor is formed on a surface of the yoke, and the temperature sensor is attached to the electromagnetic unit so that the temperature sensor is accommodated in the sensor accommodating recess, and the sensor attaching portion closes the sensor accommodating recess.