Magnetic Circuit Dimensioning for Injector Actuator Saturation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic control devices for injectors in heat engines face challenges in optimizing the sizing of the magnetic actuator due to space, functional, and feasibility constraints, particularly in ensuring precise magnetic induction and avoiding saturation issues within the magnetic circuit.
Innovation Solution
The method involves selecting materials for the magnetic circuit components with different saturation values for magnetic polarization, ensuring that all parts reach their saturation point with the same current flow, using a combination of materials like Iron-Cobalt alloy for the core, Iron-Silicon alloy for the shutter, and mild steel for the tubular body to manage magnetic flux effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the magnetic circuit components are made with uniform materials, then the design and manufacturing are simplified, but magnetic saturation occurs in certain parts leading to poor control performance
Solution Approach 1:
The patent applies local quality by assigning different magnetic materials to different components of the magnetic circuit based on their specific functions and magnetic flux requirements. The core uses high saturation flux density material (Fe-Co alloy) to handle high flux density, the shutter uses intermediate material (Fe-Si alloy), and the housing uses low-cost material (mild steel). This localized material optimization prevents saturation in critical areas while maintaining manufacturing feasibility.
Solution Approach 2:
The patent employs composite materials by combining multiple different magnetic materials (Fe-Co alloy, Fe-Si alloy, mild steel) within the same magnetic circuit. Each material is selected for its specific magnetic properties and cost characteristics, creating a composite magnetic circuit that optimizes both performance and manufacturing considerations.
2Ease of manufacture
If the passage sections of magnetic flux are made uniform across all components, then the manufacturing process is simplified, but magnetic saturation occurs in components with smaller passage sections
Solution Approach 1:
The patent implements local quality in the geometric dimensions of magnetic circuit components. Different components have different passage section areas optimized for their specific magnetic flux requirements. The core has a larger passage section to handle high flux density, while the shutter and housing have appropriately sized sections matched to their functions, preventing saturation and ensuring precise magnetic control.
3Volume of moving object
If the electromagnetic actuator is made compact to meet space constraints, then the device fits better in the engine, but the magnetic induction becomes insufficient leading to poor shutter control
Solution Approach 1:
The patent uses composite magnetic materials with different saturation flux density values to achieve compact dimensions while maintaining sufficient magnetic induction. The high saturation material (Fe-Co alloy) in the core allows for a smaller magnetic circuit cross-section while still handling the required magnetic flux, enabling compact actuator design without sacrificing control reliability.
Solution Approach 2:
The patent applies parameter changes by selecting materials with different magnetic saturation characteristics. By using materials with higher saturation flux density (Fe-Co alloy with 2.2-2.4 T), the magnetic circuit can generate the same magnetic force in a smaller volume, enabling compact actuator design that meets space constraints while maintaining reliable shutter control.
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 approach optimizes the magnetic circuit's dimensioning, preventing saturation and enhancing the reliable control of the movable shutter while adhering to size, operational, and manufacturing constraints, thereby improving the overall performance of the electromagnetic actuator.
Implementation Method 1
The circulation of a current in the winding generates the appearance of a magnetic field which creates the magnetic polarization (or magnetization) giving rise to the magnetic induction
Implementation Method 2
The magnetic induction contributes to the appearance of forces in the air gap between the stator and the movable shutter which, thus controlled in axial displacement, ensures the opening or closing of the supply circuit of the injector
Implementation Method 3
choosing, for at least two constituent parts of the magnetic circuit, passage sections of the magnetic flux of different values and different materials having different values of saturation for the magnetic polarization so that the constituent elements of the magnetic circuit reach their magnetic bias saturation value
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention relates to an electromagnetic device for operating a movable closure member forming part of a fuel supply circuit of a heat engine injector. The device includes a tubular body defining a housing containing an electromagnetic actuator for actuating the movable closure member, said actuator comprising a magnetic circuit formed by different parts, in particular the movable closure member and a core surrounded by a winding through which an excitation current flows that allows a magnetic induction to be created in the magnetic circuit. According to the invention, at least two parts of the magnetic circuit have: magnetic flux passage sections of different values; and materials (M1, M2, M3) with different magnetic polarization (J) saturation values (JsatM1, JsatM2, JsatM3), such that the constituent components of the magnetic circuit (12) reach the magnetic polarization (J) saturation value thereof for substantially the same value of current flowing in the winding.