Stroke Sensor Coil Ferromagnetic Collar Gain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional stroke sensor systems experience a decrease in sensor gain at the end of the stroke, leading to inaccurate measurement of the stroke amount due to a high fitting ratio between the conductor and the coil, which limits the accuracy of the stroke sensor's function.
Innovation Solution
Incorporating a ferromagnetic collar positioned on the opposite side of the coil, maximally fitted to the conductor, increases the sensor gain by enhancing the magnetic field interaction, thereby improving the stroke sensor's performance at the end of the stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the fitting ratio between the coil and the conductor is increased, then the structural integration is improved, but the sensor gain deteriorates
Solution Approach 1:
A ferromagnetic body is introduced as an intermediary element between the coil and the conductor. This ferromagnetic body enhances the magnetic coupling and flux density in the air gap region, thereby improving sensor gain without requiring a reduction in the fitting ratio between the coil and conductor. The ferromagnetic body acts as a magnetic mediator that amplifies the magnetic interaction while maintaining the structural integration benefits of high fitting ratio.
2Volume of moving object
If the fitting ratio between the coil and the conductor is increased, then the device compactness is improved, but the stroke measurement accuracy deteriorates
Solution Approach 1:
The ferromagnetic body serves as a magnetic intermediary that compensates for the reduced magnetic coupling caused by high fitting ratio. By placing the ferromagnetic body in the air gap region, it concentrates and enhances the magnetic flux, ensuring sufficient magnetic interaction for accurate stroke measurement while maintaining the compact device structure enabled by high fitting ratio.
Solution Approach 2:
The invention changes the magnetic properties parameter by introducing a ferromagnetic material with high permeability into the magnetic circuit. This parameter change enhances the magnetic flux density and coupling efficiency, thereby improving measurement accuracy without altering the physical fitting ratio or device dimensions.
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 configuration significantly increases the sensor gain at the end of the stroke, allowing for more accurate measurement of the stroke amount, overcoming the limitations of conventional systems.
Implementation Method 1
a ferromagnetic body which is arranged on an end position side of the coil when a position of an end portion on one end side of the conductor in a state where a fitting ratio between the conductor and the coil is maximized is defined as the end position, where the ferromagnetic body is located on an opposite side to the conductor with the coil interposed therebetween
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A stroke sensor system which can detect a change amount of stroke even at an end of the stroke is realized. The stroke sensor system (101) includes a cylinder (10), a coil (81) which is fitted to an axle side of the cylinder, and a collar (95) which is arranged on an end position side of the coil when a position of an axle-side end portion of the cylinder in a state where a fitting ratio between the cylinder and the coil is maximized is defined as the end position, where the collar is located on an opposite side to the cylinder with the coil interposed therebetween.