Ignition Coil Magnetic Circuit Optimization for High RPM Output
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Solution Overview
Problem
Existing ignition coils for internal combustion engines face challenges in providing high output in high rpm regions without increasing size, as they require larger core cross-sectional areas and wire diameters, which lead to limited performance improvements and increased size.
Innovation Solution
The design incorporates a center core and side core forming a closed magnetic circuit with magnets inserted in gaps, where the sum of magnet cross-sectional areas is set to be three times or more and less than seven times the center core area, optimizing magnetic flux and reducing coil size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the core cross-sectional area is increased to increase energy output, then the energy output in high rpm region is improved, but the size of the ignition coil increases
Solution Approach 1:
The invention changes the magnetic circuit parameters by introducing magnets with specific cross-sectional area ratios (3-7 times the center core area) and optimizing gap dimensions, thereby achieving high energy output without increasing the overall coil size. This parameter optimization allows the magnetic flux to be efficiently controlled within the existing structural constraints.
Solution Approach 2:
The invention applies local quality by placing magnets specifically in the gaps of the magnetic circuit where they are most effective, rather than uniformly increasing the entire core cross-section. This localized approach to enhancing magnetic flux concentration achieves the desired energy output improvement in high rpm regions while maintaining compact overall dimensions.
2Power
If the wire diameter of the primary coil is increased to decrease resistance and increase energy, then the energy output is improved, but the size and weight of the ignition coil increase
Solution Approach 1:
The invention optimizes the electrical parameters by carefully selecting the wire diameter to achieve the desired resistance level without excessive weight gain. Combined with the magnetic circuit optimizations (magnets and gaps), this allows achieving high energy output while controlling the weight increase within acceptable limits.
3Productivity
If the core cross-sectional area is greatly increased to improve high rpm characteristic, then the high rpm performance is improved, but the increase in size becomes excessive
Solution Approach 1:
The invention achieves improved high rpm characteristics by optimizing the magnetic circuit parameters (magnet cross-sectional area ratio of 3-7 times center core, gap dimensions) rather than simply increasing the core size. This parameter optimization enables the magnetic flux to be efficiently utilized at high rpm conditions while maintaining compact coil dimensions.
Solution Approach 2:
The invention applies local quality enhancement by strategically placing magnets in the magnetic circuit gaps, creating localized regions of enhanced magnetic flux density that specifically improve high rpm performance without requiring a proportional increase in the entire core cross-sectional area.
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 enables high output in high rpm regions while preventing size increases, enhancing energy delivery and magnetic flux saturation without excessive heat generation or size expansion.
Implementation Method 1
a sum of cross-sectional areas of the respective magnets is set to be three times or more and less than seven times of a cross-sectional area of the center core
Implementation Method 2
ignition coil for an internal combustion engine that is installed on an internal combustion engine for, for example, a motor vehicle, and is configured to supply a high voltage to an ignition plug, thereby generating spark discharge
Implementation Method 3
supply a high voltage to an ignition plug, thereby generating spark discharge
Implementation Method 4
supply a high voltage to an ignition plug, thereby generating spark discharge
Data Source
AI summary
An ignition coil for an internal combustion engine includes: a center core arranged on an inner side of a primary coil and an inner side of a secondary coil; a side core arranged on an outer side of the primary coil and an outer side of the secondary coil, and combined with the center core to form a closed magnetic circuit; one or a plurality of gaps provided between the center core and the side core, or in the side core; and a magnet arranged in each of the one or a plurality of gaps, in which a sum of cross-sectional areas of the respective magnets is set to be three times or more and less than seven times of a cross-sectional area of the center core.