Cylindrical Magnet Axial Extension for Compact Rotation Angle Detection
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Solution Overview
Problem
Existing rotation angle detection devices with flange-shaped sensors face challenges in installation due to space constraints, require high-cost magnets for sufficient magnetic flux density, and incur increased manufacturing costs due to complex bearing structures.
Innovation Solution
A rotation angle detection device with a magnet molded into a cylindrical shape on a plate member fastened to a rotating shaft, where the magnet extends beyond the plate's thickness, reducing radial projection and allowing for increased magnetic flux density while maintaining a simple configuration and low material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the sensor portion is formed in a flange shape, then the magnetic flux density can be secured, but the installation space is widened due to radial projection
Solution Approach 1:
The patent changes the magnet shape from a flange shape (radial extension) to a cylindrical shape extending in the axial direction. This dimensional change allows the magnet to achieve sufficient volume and magnetic flux density without increasing the radial installation space, as the extension occurs along the shaft axis rather than radially outward.
Solution Approach 2:
The patent modifies the geometric parameters of the magnet by changing its shape from flange to cylindrical, and adjusts the height parameter to extend beyond the plate thickness. This parameter change enables the magnet to maintain adequate volume for sufficient magnetic flux density while conforming to space constraints in the radial direction.
2Area of stationary object
If the projection of the sensor portion to the outside in a radial direction is suppressed, then the installation space is reduced, but the magnet volume is decreased
Solution Approach 1:
The patent resolves this contradiction by redirecting the magnet's extension from the radial dimension to the axial dimension. The cylindrical magnet extends in the axial direction beyond the plate thickness, thereby maintaining sufficient magnet volume without requiring radial projection, thus satisfying both space constraints and magnetic flux density requirements.
3Reliability
If the bearing is designed with a complex shape to support the sensor portion, then the sensor portion can be supported, but material costs and processing costs increase
Solution Approach 1:
The patent extracts the sensor portion (magnet) from the bearing structure, allowing the bearing to return to a simple, standard shape. The magnet is mounted separately on the shaft end via a plate, eliminating the need for a complex bearing design, thereby reducing material and processing costs while maintaining reliable support for the sensor portion.
Solution Approach 2:
The patent segments the sensor portion from the bearing structure, creating independent components. The bearing remains a simple support element, while the magnet and plate form a separate mounting assembly. This segmentation simplifies manufacturing of each component individually while ensuring proper support functionality.
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 device achieves reduced size and secured magnetic flux density with a simple configuration, lowering material and processing costs while effectively detecting rotation angles.
Implementation Method 1
a magnet installed on a rotating shaft, which magnetically detects a rotation angle of the rotating shaft
Data Source
AI summary
Provided is a rotation angle detection device, having a magnet installed on a valve shaft, which magnetically detects a rotation angle of a valve shaft, the device being configured to include a plate member having a predetermined thickness which is fastened and fixed to one end of the valve shaft, wherein the magnet is molded to the plate member into a cylindrical shape having a height larger than the predetermined thickness.