Magnetic Sensor Noise Management via Segmented Capacitor Housing
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Solution Overview
Problem
Existing rotation detection sensors face challenges in adjusting the capacitance of noise prevention capacitors, making it difficult to effectively manage external noise levels, which can increase costs and reduce noise resistance.
Innovation Solution
A magnetic detection sensor and cable with sensor design that includes a separately housed noise prevention capacitor, allowing for easy adjustment of capacitance by using first and second joining portions to connect lead frames to signal wires and capacitor lead wires within a housing portion, enabling flexible noise management without altering the magnetic sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the noise prevention capacitor is incorporated in the detection section, then the sensor structure is compact, but the capacitance cannot be easily adjusted
Solution Approach 1:
The sensor is divided into two separate sections: the detection section (containing the magnetic detection element) and the housing portion (containing the capacitor). This segmentation allows the capacitor to be positioned separately from the detection section, enabling easy adjustment of capacitance by simply changing the capacitor in the housing portion without affecting the detection section or requiring recalibration.
Solution Approach 2:
Lead wires act as intermediaries connecting the capacitor in the housing portion to the detection section. These lead wires transmit the capacitive effect from the separately positioned capacitor to the detection section, enabling noise prevention functionality while maintaining physical separation that facilitates easy capacitance adjustment.
2Ease of manufacture
If the capacitance is not properly adjusted to match external noise levels, then the sensor can be manufactured with fixed components, but noise resistance decreases
Solution Approach 1:
The capacitance parameter of the noise prevention capacitor can be changed to match different external noise levels. By providing capacitors with different capacitance values and allowing selection based on the specific application's noise environment, the sensor achieves optimal noise resistance while maintaining ease of manufacture through standardized capacitor components.
3Reliability
If custom capacitors are selected for each noise level, then noise resistance improves, but costs increase
Solution Approach 1:
Instead of requiring custom-designed capacitors for each application, the invention uses standard capacitor components with different capacitance values. This allows selection of appropriate capacitance based on noise levels while maintaining compatibility with existing manufacturing processes and component supply chains, thus improving noise resistance without significantly increasing costs.
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 configuration allows for easy adjustment of capacitance to match external noise levels, reducing costs and improving noise resistance while maintaining the existing magnetic sensor's functionality.
Implementation Method 1
a magnetic detection element for detecting a magnetic field from the magnetic poles
Data Source
AI summary
A magnetic detection sensor for being installed at an end of a cable with a pair of signal wires to detect a magnetic field from magnetic poles. The sensor includes a magnetic sensor including a detection section and a pair of lead frames, the detection section including a magnetic detection element for detecting the magnetic field from the magnetic poles, and the lead frames extending from the detection section and configured to output a detection signal of the detection section, a housing portion that houses the magnetic sensor, and a capacitor that is provided separately from the magnetic sensor and is housed in the housing portion. First joining portions respectively joining the pair of lead frames to the pair of signal wires and second joining portions respectively joining the pair of lead frames to a pair of lead wires of the capacitor are located inside the housing portion.