Sealed Magnetic Sensor Module for Compact Angle Detection
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Solution Overview
Problem
Existing magnetic field detection devices face challenges in achieving accurate detection while protecting the sensor components from environmental factors, such as water and lubricating oil, and in optimizing the distance between the magnetic field generation unit and the angle sensor to reduce size and cost.
Innovation Solution
A magnetic field detection device with a magnetic field generation unit and a magnetic field detection unit housed in separate, sealed compartments, where the detection unit is exposed and surrounded by a seal member, allowing for movement relative to a moving body, with a first housing mounted on a second housing via a seal member to maintain a sealed environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between the magnetic field generation unit and the angle sensor is reduced to minimize device size and cost, then a smaller and less expensive magnet can be used, but the sensor becomes more vulnerable to environmental factors such as water and lubricating oil
Solution Approach 1:
The device is divided into two separate housings: a first housing that accommodates the angle sensor and is sealed to protect it from environmental factors, and a second housing that accommodates the magnetic field generation unit. This segmentation allows the sensor to be protected while maintaining a compact overall structure.
Solution Approach 2:
A seal member is introduced as an intermediary element between the first housing (containing the sensor) and the second housing (containing the magnet). This seal member protects the sensor from environmental factors while allowing the magnetic field to pass through, thus resolving the contradiction between protection and magnetic field access.
2Object-affected harmful factors
If a sealed structure is used to protect the angle sensor and electric circuit board from water, lubricating oil, and dust, then sensor protection is improved, but the device complexity increases
Solution Approach 1:
The sealed structure is segmented into two separate housings with distinct functions. The first housing is sealed to protect the sensor, while the second housing accommodates the magnet. This segmentation simplifies the overall design compared to a single complex sealed housing, as each housing can be optimized independently for its specific function.
Solution Approach 2:
The seal member acts as a simple intermediary component that connects the two housings while providing the necessary protection. This approach avoids the need for complex sealing mechanisms within a single housing, thereby reducing overall device complexity while maintaining effective protection.
3Measurement precision
If the angle sensor is exposed in the accommodation unit to allow magnetic field access, then detection accuracy is improved, but the sensor becomes more susceptible to environmental contamination
Solution Approach 1:
The sensor is placed in a separate first housing that is sealed against environmental factors, while the magnetic field generation unit is in a second housing. This segmentation allows the sensor to be exposed to the magnetic field for accurate detection while simultaneously being protected from environmental contamination through the sealed first housing.
Solution Approach 2:
The seal member serves as an intermediary that allows the magnetic field to pass through while blocking environmental factors such as water and dust. This enables the sensor to remain exposed to the magnetic field for accurate detection while being protected from harmful environmental factors.
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
Enhances detection accuracy and reduces device size and cost by allowing a smaller, less expensive magnet to be used, while maintaining a stable magnetic field application to the detection unit.
Implementation Method 1
a magnetic field generation unit that generates a magnetic field, a magnetic field detection unit that detects the magnetic field
Data Source
AI summary
A magnetic field detection device includes a magnetic field generation unit that generates a magnetic field, a magnetic field detection unit that detects the magnetic field, a first housing that has an accommodation unit that accommodates the magnetic field detection unit so that the magnetic field detection unit is exposed, and a second housing that movably accommodates a moving body. The strength or angle of the magnetic field generated from the magnetic field generation unit and applied to the magnetic field detection unit changes in accordance with movement of the moving body. The second housing has a mounting unit on which the first housing is mounted. The first housing is mounted on the mounting unit via a seal member that surrounds the magnetic field detection unit, so that the mounting unit is between the magnetic field detection unit and the moving body, and the inside of the accommodation unit is sealed by the seal member and the mounting unit.