Torque Sensor Axial Chip Arrangement Shear Force Error
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Solution Overview
Problem
Existing torque sensors for torsion elements are prone to errors in torque detection due to shear forces caused by mechanical play, which result in relative radial misalignment between the transmitter and sensor chips, leading to incorrect measurement signals.
Innovation Solution
The sensor design positions the sensor chip axially relative to the transmitter element, reducing sensitivity to shear forces and improving torque detection accuracy by maintaining the transmitter and sensor chips at the same height but radially spaced apart, using a magnet as the transmitter element to generate a variable magnetic field, and employing a bar magnet with a rectilinear shape for cost-effectiveness and efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sensor chip is arranged radially to the transmitter element, then the sensor structure is compact and easy to manufacture, but shear forces cause radial misalignment leading to incorrect torque detection
Solution Approach 1:
The patent transitions from a radial arrangement (in the same axial plane) to an axial arrangement (different axial positions). The sensor chip is positioned at an axial distance from the transmitter element along the axis of rotation, changing the spatial dimension of arrangement. This dimensional change eliminates the radial misalignment problem caused by shear forces while maintaining measurement functionality through the elastic deformation of the torsion element.
2Device complexity
If the transmitter element and sensor chip are arranged at the same axial height, then the device structure is simplified, but shear forces cause radial misalignment and measurement errors
Solution Approach 1:
The patent introduces an axial distance between the transmitter element and sensor chip, moving them to different axial positions. This changes the spatial arrangement from a two-dimensional radial configuration to a three-dimensional axial configuration. The axial separation prevents radial misalignment issues while the torsion element's elastic deformation still enables torque measurement through changes in the transmitting field.
3Use of energy by moving object
If a magnet is used as the transmitter element, then energy consumption is reduced and the device is more compact, but the magnetic field must be precisely maintained against shear forces
Solution Approach 1:
By positioning the sensor chip axially at a distance from the magnet, the patent creates a measurement configuration that is less sensitive to radial displacements. The axial arrangement means that shear forces causing radial misalignment have minimal impact on the magnetic field interaction, thereby maintaining field stability and measurement reliability while using the energy-efficient magnet.
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 minimizes errors in torque detection by reducing the impact of shear forces and ensures accurate measurement signals, allowing for reliable and energy-efficient torque sensing in applications like vehicle steering systems.
Implementation Method 1
the transmitter element is a magnet which emits a magnetic field as the transmitting field
Implementation Method 2
the torsion element for detecting the torque is designed to be elastic. Due to the elasticity, the torsion element can be twisted with the torque about the rotational axis
Data Source
AI summary
The invention relates to a sensor (9) for detecting a torque (13) exerted on a torsion element (10) and acting about an axis of rotation (8), comprising:a transmitter element (16) which can be mounted in a stationary manner relative to a first axial end of the torsion element (10) and is designed to output a transmitting field (17) which can be varied in the peripheral direction (24) about the axis of rotation (8),a sensor chip (18) which can be mounted in a stationary manner relative to a second end opposite the first axial end of the torsion element (10) and is designed to output a measurement signal (20) which is dependent on the transmitting field (17) arriving at the sensor chip (18), andan evaluation device (21) which is designed to output a sensor signal (19) dependent on the torque (13) on the basis of the measurement signal (20),wherein the sensor chip (18) is arranged at an axial distance from the transmitter element (16), radially overlapping same.