Shaft-Integrated Angle Sensor for E-Bike
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Solution Overview
Problem
Magnetic field sensors in harsh environments, such as automotive systems, are susceptible to disturbances that lead to faulty measurements and sensor failures due to positioning tolerances, requiring effective mechanisms to mitigate these issues.
Innovation Solution
A sensor arrangement featuring a rotatable driving shaft with a magnet module and sensing element, where the shaft shields the magnet and sensor module from disturbances, allowing for accurate angle measurement without extensive encapsulation or additional space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic field sensors are used in harsh environments, then angle measurement capability is provided, but measurement accuracy deteriorates due to magnetic field disturbances
Solution Approach 1:
The patent integrates the shaft structure itself as a magnetic shield, converting the shaft from a mere mechanical component into a protective element that blocks external magnetic field disturbances from reaching the sensor, thereby maintaining measurement accuracy in harsh environments
Solution Approach 2:
The sensor arrangement is merged with the shaft by integrating the sensing element into the shaft's bore and coupling the magnet module to the shaft, creating a unified structure where the shaft simultaneously serves mechanical and shielding functions
2Object-affected harmful factors
If extensive encapsulation is used to protect the sensor, then protection from disturbances is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent merges the protective shielding function with the existing shaft structure, eliminating the need for separate encapsulation components. The shaft itself is configured to provide magnetic shielding, reducing device complexity while maintaining protection
Solution Approach 2:
The shaft is designed to serve multiple functions simultaneously: it provides mechanical support for rotation, houses the sensing element within its bore, and acts as a magnetic shield against external disturbances, thereby reducing the need for additional protective components
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 provides robust and accurate angle sensing by shielding the sensor and magnet module from disturbances, enhancing the reliability and precision of magnetic field measurements in harsh environments.
Implementation Method 1
a magnet module arranged within the bore and coupled to the rotatable driving shaft, the magnet module configured to generate a magnetic field within the bore
Implementation Method 2
at least one sensing element configured to sense a rotation of the magnetic field in response to rotation of the rotatable driving shaft
Data Source
AI summary
A sensor arrangement and an e-bike that includes the sensor arrangement are provided. The sensor arrangement includes a rotatable driving shaft for an e-bike extending along a rotation axis and includes a bore extending from a first end face of the rotatable driving shaft along the rotation axis, a magnet module arranged within the bore and coupled to the rotatable driving shaft, the magnet module configured to generate a magnetic field within the bore, and at least one sensing element configured to sense a rotation of the magnetic field in response to rotation of the rotatable driving shaft.