Segmented Stator Electromagnetic Actuator for Fuel Injectors
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Solution Overview
Problem
Existing electromagnetic actuators for controlling fluid flow in fuel injectors face challenges in balancing stator-coil force capacity, fluid passageway strength, and production cost, often requiring complex geometries that increase costs without adequately addressing these objectives.
Innovation Solution
The electromagnetic actuator design includes a stator with an inner and outer pole member, a coil disposed around the inner pole, and an armature movable under a magnetic field, which controls fluid transmission through a fluid passageway within the outer pole member, optimizing force capacity and cost while using efficient material and space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If inner and outer pole dimensions are increased to increase actuation force, then force capacity is improved, but device complexity and production cost increase due to complex geometries required for stator and stator housing
Solution Approach 1:
The stator is divided into separate inner pole and outer pole components that can be manufactured independently using standard geometries, then assembled together. This segmentation allows each component to be produced with simpler, more manufacturable shapes while achieving the required pole area for adequate actuation force.
Solution Approach 2:
The inner pole is positioned within the outer pole structure, with the coil wound around the inner pole. This nested arrangement maximizes the magnetic circuit efficiency and pole area within the available space envelope, achieving high actuation force without requiring complex external geometries.
2Force
If inner and outer pole dimensions are increased to increase actuation force, then force capacity is improved, but production cost increases due to complex geometries
Solution Approach 1:
By segmenting the stator into separate inner and outer pole components with standard geometries, each part can be manufactured using conventional, cost-effective processes rather than requiring expensive complex machining or molding operations.
Solution Approach 2:
The design optimizes the dimensions and arrangement of the pole segments to achieve the required magnetic flux density and actuation force while maintaining manufacturable geometries, balancing performance requirements with production cost constraints.
3Volume of moving object
If complex geometries are used for stator and stator housing to maintain product envelope dimensions, then compactness is improved, but fluid passageway strength and reliability deteriorate due to reduced housing material
Solution Approach 1:
The stator components are designed as separate modular units with standardized geometries that can be assembled within the housing, allowing the housing to maintain adequate wall thickness and structural integrity while still achieving compact overall 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
This design enhances actuator force capacity while reducing production costs and maintaining desired packaging dimensions, effectively controlling fluid flow and improving injection precision in fuel injectors.
Implementation Method 1
a coil disposed around the inner pole member and arranged between the inner pole member and the outer pole member
Implementation Method 2
an armature moveable under the influence of a magnetic field generated by the stator and coil
Data Source
AI summary
An apparatus and method for controlling fluid flow is disclosed. An electromagnetic actuator may include a stator having an inner pole member and an outer pole member. The outer pole member may have a fluid passageway therein for transmitting fluid through the outer pole member. The actuator may further include a coil disposed around the inner pole member and arranged between the inner pole member and the outer pole member. The actuator may also include an armature moveable under the influence of a magnetic field generated by the stator and coil and operable to affect transmission of the fluid through the fluid passageway.