Segmented Coil Drive for High-Mass Ejection
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Solution Overview
Problem
Existing drive devices for applying high-energy pulses to mechanical members, such as those in avionics, fall short in achieving sufficient acceleration distance and repellent force, particularly when dealing with high masses.
Innovation Solution
A drive device featuring a piston with a stack of alternately paramagnetic and insulating blocks within an electromagnetic coil, allowing for controlled energy release in the form of series pulses, mimicking a step motor to achieve high acceleration, and incorporating a return mechanism for piston retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a single cylindrical coil with a sliding piston is used, then the acceleration distance is maximized for that configuration, but the acceleration distance remains insufficient for high-mass applications in avionics
Solution Approach 1:
The single coil is divided into multiple coils arranged in series along the piston's path. Each coil generates a repellent force that acts on the piston sequentially, accumulating total force and extending the effective acceleration distance through multiple stages rather than relying on a single coil's limited force-distance product.
Solution Approach 2:
The drive device operates by sequentially energizing multiple coils in a periodic manner as the piston moves through each stage. This periodic activation of discrete coils creates a stepped force application that maintains high repellent force while extending the total acceleration distance beyond what a single continuous coil could achieve.
2Force
If the mass of the mechanical member is increased to handle high-mass applications, then the repellent force must be increased proportionally, but existing devices cannot generate sufficient force
Solution Approach 1:
The force generation is segmented across multiple coils that act in sequence on the piston. Each coil contributes to the total force, and the cumulative effect of multiple coils provides the high repellent force needed to accelerate high-mass objects, distributing the force-generation task across several electromagnetic actuators.
Solution Approach 2:
Multiple coils are combined in series to work together as a unified drive system. The individual force contributions of each coil merge to produce the total repellent force required for high-mass applications, creating a cumulative force effect that exceeds what any single coil could generate alone.
3Duration of action of moving object
If continuous energy supply is used, then the movement pulse can be maintained, but energy efficiency and controlled pulsing are reduced
Solution Approach 1:
Instead of continuous energy supply, the system uses periodic pulsing of multiple coils in sequence. Each coil is energized only when the piston is in its vicinity, creating a series of discrete energy pulses that collectively produce sustained movement. This periodic activation improves energy efficiency by avoiding continuous power consumption while maintaining the desired pulse duration through coordinated sequencing.
Solution Approach 2:
The control system preliminarily determines the sequencing and timing of coil activation based on the piston's position. By pre-coordinating which coils should be energized at each stage, the system ensures that energy is applied only when and where needed, optimizing the movement pulse duration while minimizing wasted energy from premature or continuous activation.
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
The device achieves enhanced acceleration distance and repellent force, enabling effective high-energy movement pulses with significant power and controlled movement, simplifying logistics by eliminating the need for consumable products in applications like aircraft load ejection.
Implementation Method 1
the cylindrical coils are connected electrically in a circuit which comprises a capacitor with a high energy capacity and a switch which, at the desired time, allows the capacitance to be discharged into the coils in order to bring about therein a current which allows Foucault currents to be induced in the piston
Implementation Method 2
a current which allows Foucault currents to be induced in the piston
Implementation Method 3
there is produced between each coil and the piston in question a repellent force
Data Source
AI summary
This device comprises an electromagnetic coil (3) in which there is able to slide a piston (6) which has at least a portion made of a material having paramagnetic susceptibility and which is placed in contact with the mechanical member when the drive device (1) is in the rest state.Electrical energy supply means are provided in order to store electrical energy and to abruptly release this energy into the coil and thus apply the high-energy magnetic movement pulse to the mechanical member.According to the invention, the piston (1) comprises a stack (9) of blocks (11, 12) which are made alternately from the material having paramagnetic susceptibility and an insulating material; and the electrical energy supply means are provided in order to allow the energy to be applied to the coil in the form of a series of electrical pulses which appear as the piston (6) moves.