Magnetic Angle Sensor Gradient Detection
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Solution Overview
Problem
Existing magnetic angle sensing systems face challenges in accurately determining the rotational position of a shaft due to higher harmonics caused by deviations of the magnetic field from a plane, leading to angle errors, and require a large number of sensing elements and significant circuitry, which increases space and power consumption.
Innovation Solution
A magnetic angle sensor device using a smaller number of sensors, specifically two Bx-angle sensors and two By-angle sensors spaced apart, detects magnetic field gradients to determine the rotation angle efficiently, reducing magnetic disturbance fields and simplifying the layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of sensing elements are used to accurately detect magnetic field components, then measurement precision is improved, but device complexity and space consumption increase
Solution Approach 1:
The sensor system is divided into two spatially separated sensor groups, each detecting magnetic field components at different locations. This segmentation allows accurate determination of magnetic field gradients through spatial differentiation, reducing the need for a large number of sensing elements while maintaining measurement precision.
Solution Approach 2:
The invention transitions from detecting magnetic field components at a single location to detecting components at multiple spatial locations along a straight line. This dimensional expansion in space enables gradient detection through spatial differentiation, achieving accurate angle measurement with fewer sensors.
2Measurement precision
If more sensing elements and circuitry are deployed to improve angle detection accuracy, then measurement precision is improved, but power consumption increases
Solution Approach 1:
By segmenting the sensing system into two groups at different positions and using gradient detection, the invention reduces the total number of sensing elements required. This reduction directly decreases the power consumption associated with operating multiple sensors and their associated circuitry, while maintaining measurement accuracy.
3Area of stationary object
If sensors are placed close together to reduce space, then device compactness is improved, but magnetic disturbance fields from adjacent sensors increase
Solution Approach 1:
The invention extracts and utilizes the magnetic field gradient information by placing sensors at separated positions along a straight line. This spatial separation removes the harmful magnetic disturbance fields that would be present if sensors were placed close together, while still enabling accurate angle detection through gradient measurement.
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 approach allows for accurate determination of the rotation angle with reduced sensor elements and power consumption, enhancing robustness against disturbances and minimizing angle errors, while maintaining efficiency and precision.
Implementation Method 1
the first type of angle sensor is sensitive to detect a first magnetic field component in a first direction and the second type of angle sensor is sensitive to detect a second magnetic field component in a second direction
Data Source
AI summary
An embodiment relates to a magnetic angle sensor device comprising a first group of magnetic angle sensors and a second group of magnetic angle sensors, wherein the first group of magnetic angle sensors and the second group of magnetic angle sensors are located on different positions along a straight line, wherein the first group of magnetic angle sensors comprises at least one first type of angle sensor and at least one second type of angle sensor, wherein the second group of magnetic angle sensors comprises the at least one first type of angle sensor and the at least one second type of angle sensor, wherein the at least one first type of angle sensor is sensitive to detect a first magnetic field component in a first direction and the at least one second type of angle sensor is sensitive to detect a second magnetic field component in a second direction, and wherein a combined rotation angle is determined based on the detected first magnetic field components and the detected second magnetic field components.