Rotation Angle Detection Device Using Single Yoke and Hall Element
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Solution Overview
Problem
Conventional rotation angle detection devices require multiple components, leading to variations in detection angles and larger sizes due to complex positional relationships among components.
Innovation Solution
A rotation angle detection device with a magnetic field generation section fixed to either the rotating body or a supporting member, using a single yoke with a tube shape surrounding the magnetic field generation section and a magnetism detection section in a gap, ensuring consistent magnetic field lines and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple components (two yoke pieces and two Hall elements) are used, then the detection function is achieved, but the number of components increases and positional relationships vary
Solution Approach 1:
The patent combines two separate yoke pieces into a single yoke structure and uses one Hall element instead of two, merging multiple components into fewer integrated components. This reduces the number of parts while maintaining the detection function, thereby improving positional relationship stability and reducing detection angle variation.
2Measurement precision
If all components are required regardless of detection range, then the detection function is maintained, but the device size cannot be reduced
Solution Approach 1:
The patent extracts and removes unnecessary components from the detection system. By using only one Hall element and a single yoke structure instead of two of each, it eliminates redundant parts while maintaining adequate detection functionality, thereby reducing the overall device size.
3Measurement precision
If multiple components are assembled, then the detection capability is achieved, but positional relationships among components vary
Solution Approach 1:
The patent merges multiple components into fewer integrated components, reducing the number of assembly interfaces. By using one yoke and one Hall element instead of two of each, it minimizes the cumulative assembly errors and improves positional relationship consistency among 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
This configuration reduces component variability and device size by using fewer components, stabilizing the output and allowing for precise detection angle measurements across a range of rotation angles.
Implementation Method 1
a magnetic field generation section that rotates integrally with a rotating body
Implementation Method 2
two Hall elements as magnetic detection sections are disposed in gaps between end portions of two yoke pieces
Data Source
AI summary
A rotation angle detection device includes a magnetic field generation section, a yoke, and a magnetism detection section. The magnetic field generation section has a first end portion and a second end portion. The yoke has such a tube shape that the magnetic field generation section and a rotation axis of a rotating body are located therein. The yoke has a gap at a part in a circumferential direction in a cross section perpendicular to the rotation axis. The magnetism detection section is disposed in the gap and outputs an electrical signal in accordance with a magnetic field strength in the gap. The magnetic field generation section is disposed in such a manner that a magnetic force line passing through the magnetic field generation section passes through the rotation axis regardless of the rotation angle of the rotating body and the rotation axis passes through the first end portion.