Axial Hall Speed Sensor Layout for Vibration-Robust Shaft Measurement
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Solution Overview
Problem
Existing speed measuring arrangements in vehicles are sensitive to changes in sensor-distance and vibration, leading to inaccurate data and packing issues, especially when measuring rotational speed of vehicle members like shafts.
Innovation Solution
A vehicle assembly with a speed measuring arrangement featuring a Hall sensor and magnet configuration that allows for a robust and reliable measurement by positioning the sensor axially relative to the vehicle member, utilizing a telescopic magnetic field effect to minimize interference from vibrations and variations in distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is positioned close to the wheel member to improve measurement accuracy, then measurement precision is improved, but the sensor becomes vulnerable to damage from impacts between the sensor and wheel member
Solution Approach 1:
The patent transitions from a radial sensor placement (in the plane of rotation) to an axial placement (perpendicular to the rotation plane). This dimensional change allows the sensor to be positioned at a safe distance from the wheel member while maintaining measurement capability through the magnetic field's axial component, resolving the contradiction between proximity for accuracy and distance for safety.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the sensor and wheel member. Instead of direct mechanical proximity, the magnetic field transmits the rotational information, allowing the sensor to be positioned at a safe distance while still achieving accurate measurement through magnetic flux variations.
2Reliability
If the sensor is positioned far from the wheel member to protect the sensor from impacts, then sensor durability is improved, but measurement accuracy and reliability are reduced
Solution Approach 1:
By placing the sensor axially rather than radially, the patent enables the sensor to be positioned at a greater distance from the wheel member without sacrificing measurement accuracy. The magnetic field's axial component provides sufficient signal strength even at this increased distance, resolving the contradiction between safety distance and measurement precision.
Solution Approach 2:
The patent changes the spatial parameter of sensor placement from radial distance to axial position. This parameter change fundamentally alters the magnetic field interaction geometry, allowing accurate measurement at larger distances by utilizing the axial magnetic flux component instead of radial flux.
3Productivity
If traditional speed measuring arrangements are used, then measurement capability is provided, but the arrangements are sensitive to vibrations and oscillations causing erroneous data
Solution Approach 1:
The patent repositions the sensor from the radial plane to the axial direction, changing the orientation of magnetic field interaction. This dimensional change makes the measurement less susceptible to vibration-induced errors because axial magnetic flux variations are less affected by radial vibrations and oscillations of the wheel member.
Solution Approach 2:
The patent converts the potential harm of vibration into a benefit by using the axial magnetic field configuration. Vibrations that would cause erroneous radial measurements are instead minimized in their effect on axial magnetic flux, allowing the system to ignore vibration interference and maintain accurate measurement.
4Volume of moving object
If components are packed efficiently in vehicles, then space utilization is improved, but fitting and arranging components becomes difficult
Solution Approach 1:
The patent changes the spatial arrangement from a planar radial configuration to a three-dimensional axial configuration. This dimensional change allows more efficient use of available space in the vehicle by orienting components along the rotation axis rather than in the rotation plane, improving space utilization while maintaining ease of assembly.
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
Ensures accurate and reliable rotational speed measurement while alleviating packing issues, reducing sensitivity to vibrations and variations in sensor-distance, and maintaining measurement efficiency.
Implementation Method 1
a Hall sensor arranged at the end section of the speed sensor unit... the sensor may be arranged to sense variations in magnetic flux density due to positional changes of the number of ferromagnetic elements of the wheel member
Implementation Method 2
the speed sensor unit comprises a Hall sensor arranged at the end section of the speed sensor unit... a magnet, and wherein the Hall sensor is arranged between the magnet and the portion of the vehicle member
Data Source
AI summary
A vehicle assembly is disclosed comprising a vehicle member and a speed measuring arrangement for measuring a rotational speed of the vehicle member. The speed measuring arrangement comprises a set of elements arranged at a portion of the vehicle member and being configured to rotate in a first plane upon rotation of the vehicle member. The speed measuring arrangement further comprises a speed sensor unit comprising an end section facing the portion of the vehicle member from a first side of the first plane. The speed sensor unit comprises a Hall sensor arranged at the end section. The present disclosure further relates to a transmission unit comprising a vehicle assembly and a vehicle.