Coil Assembly Pre-Magnetization for Fast Magnetic Saturation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid injection valves with electromagnetic actuators face challenges in achieving optimal magnetic properties and efficient energy use, particularly at high fluid pressures, due to energy losses during solenoid energization and slow magnetic field development.
Innovation Solution
A coil assembly for the electromagnetic actuator of a fluid injection valve that includes a solenoid with pre-magnetization by permanent magnets, allowing for fast magnetic saturation and reduced energy consumption, featuring a coil housing, pole piece, and armature made of magnetic materials, which enhances magnetic field distribution and force transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional solenoid coil is used without pre-magnetization, then the device complexity is lower, but the magnetic field development is slow and energy losses are high during energization
Solution Approach 1:
The patent applies pre-magnetization by positioning permanent magnets in the magnetic circuit before the solenoid is energized. This preliminary magnetic field preparation reduces the time and energy required for magnetic field development when the solenoid activates, directly resolving the contradiction between fast magnetic field development and device complexity.
2Stress or pressure
If the solenoid is energized at high fluid pressures, then the valve can handle high hydraulic loads, but energy losses increase and magnetic field saturation is delayed
Solution Approach 1:
The permanent magnets provide a pre-established magnetic field that reduces the energy required to achieve magnetic saturation during solenoid energization. This is particularly beneficial at high hydraulic pressures where higher magnetic forces are needed, thus resolving the contradiction between pressure handling capability and energy consumption.
Solution Approach 2:
The magnetic circuit uses composite construction with permanent magnets combined with soft-magnetic materials in the pole pieces and yoke. This composite approach enhances the overall magnetic field strength and efficiency, enabling high pressure handling with reduced energy losses.
3Power
If permanent magnets are added to the coil assembly for pre-magnetization, then magnetic field strength and speed are improved, but the manufacturing complexity increases
Solution Approach 1:
The permanent magnets are positioned within the existing coil assembly structure, nested between the solenoid windings and the magnetic circuit components. This nesting approach integrates the permanent magnets into the existing manufacturing流程 without requiring completely new assembly processes, thus resolving the contradiction between magnetic field strength and manufacturing ease.
4Reliability
If the magnetic path components are made of magnetic materials, then magnetic field penetration is improved, but the weight of the actuator increases
Solution Approach 1:
Magnetic materials are applied locally only where needed in the magnetic circuit path (pole pieces, yoke, armature) rather than throughout the entire actuator. This localized application maintains efficient magnetic field penetration while minimizing unnecessary weight, resolving the contradiction between magnetic field penetration efficiency and actuator weight.
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 fast valve opening transients, precise control, and the ability to handle high hydraulic loads, making the fluid injection valve suitable for pressures up to 500 bar with reduced energy consumption and improved magnetic force.
Implementation Method 1
The magnetic behavior of the fluid injection valve, and in particular the development of the magnetic field when the coil is energized
Implementation Method 2
allowing for fast magnetic saturation
Implementation Method 3
electromagnetic actuators have coils which may be designed to optimize current losses in the coil turns and maximize the magnetic field
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
A coil assembly (100) for an electromagnetic actuator (10) of a fluid injection valve (1) is disclosed. It comprises a solenoid (110) having a central axis(C), a first permanent magnet (120) and a second permanent magnet (130). Further, a fluid injection valve (1) is disclosed