Electromagnetic Valve Yoke Notch Design for Radial Attraction
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Solution Overview
Problem
Conventional electromagnetic valves face challenges in generating sufficient magnetic attraction force to attract a movable element radially, leading to insufficient sliding resistance and increased noise due to minute vibrations, as the width and length of the notch on the collar are not specified, resulting in inadequate attraction force.
Innovation Solution
The electromagnetic valve incorporates a yoke with a notch formed outside its circumference from two points, where the width is set based on the target attraction force and the length is set to be greater than or equal to a predetermined value, ensuring a consistent attraction force is generated when the coil is energized, effectively attracting the movable element and reducing self-excited vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a notch is formed in the collar to generate radial attraction force, then the magnetic attraction force balance is improved, but the attraction force becomes insufficient if the notch dimensions are small
Solution Approach 1:
The patent applies asymmetry by forming a notch in the yoke that is asymmetric with respect to the axis of the movable element. This asymmetric notch structure creates an unbalanced magnetic attraction force in the radial direction, causing the movable element to be attracted toward one side. The notch dimensions (width W and length L) are specifically designed to generate sufficient attraction force while maintaining the asymmetric configuration.
2Force
If the notch width and length are increased to improve attraction force, then the magnetic attraction force is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by establishing specific dimensional relationships for the notch width W and length L. The width W is set within a specific range (0.5mm to 5mm) and the length L is set within a specific range (2mm to 20mm), with their ratio L/W constrained to 0.1 to 5. These parameter specifications ensure sufficient attraction force while maintaining manufacturability and processing ease.
3Force
If the notch dimensions are precisely controlled to achieve target attraction force, then the attraction force precision is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The patent applies parameter changes by defining specific ranges for notch width W (0.5mm to 5mm) and length L (2mm to 20mm), with their ratio L/W constrained to 0.1 to 5. These parameter specifications provide a design space that ensures sufficient attraction force while accommodating normal manufacturing tolerances, thereby reducing the stringency of precision requirements.
4Object-affected harmful factors
If the movable element is attracted to one side to generate sliding resistance, then the noise suppression is improved, but the attraction force becomes insufficient without proper notch design
Solution Approach 1:
The patent applies asymmetry by forming a notch in the yoke that is asymmetric with respect to the axis of the movable element. This asymmetric notch structure creates an unbalanced magnetic attraction force in the radial direction, causing the movable element to be attracted toward one side. The notch dimensions (width W and length L) are specifically designed to generate sufficient attraction force while maintaining the asymmetric configuration.
Solution Approach 2:
The patent applies parameter changes by establishing specific dimensional relationships for the notch width W and length L. The width W is set within a specific range (0.5mm to 5mm) and the length L is set within a specific range (2mm to 20mm), with their ratio L/W constrained to 0.1 to 5. These parameter specifications ensure sufficient attraction force while maintaining manufacturability and processing ease.
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 reliably generates an attraction force that matches the target, suppressing self-excited vibrations and abnormal noise during operation, while allowing for reduced processing accuracy and cost in manufacturing the yoke.
Implementation Method 1
a coil provided on the outer periphery of the sleeve; and a yoke with a first insertion hole for inserting the stator and a second insertion hole coaxial with the first insertion hole for inserting the sleeve, the yoke being provided to surround the coil and to form a magnetic circuit together with the stator and the movable element when the coil is energized
Implementation Method 2
the width of the notch is set based on a target attraction force of an attraction force that increases as the attraction force width increases, the attraction force width being for attracting the movable element toward an inner peripheral surface of the sleeve
Data Source
AI summary
A yoke is provided with a notch, notched from two points P1 and P2 on a circumference forming a sleeve-side insertion hole toward the outside of the circumference, the notch having a minimum distance between the points P1 and P2 as a width W and the distance from a straight line linking the points P1 and P2 in a direction orthogonal to the straight line as a length L. The width W of the notch is set on the basis of a target attraction force for attracting a plunger, the attraction force increasing with an increase in the width W, and the length L of the notch is greater than or equal to a prescribed length Ld where the attraction force increasing with an increase in the length L becomes constant at the target attraction force in the set width W irrespective of an increase in the length L.