Free Piston Linear Alternator with Opposed Pistons and Spring Return
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Solution Overview
Problem
Conventional linear alternators with free pistons face inefficiencies due to high heat generation and lack of effective cooling for permanent magnets, leading to reduced electrical current generation and engine performance.
Innovation Solution
The design incorporates a free piston linear alternator with opposed pistons and return members, utilizing stored energy to return pistons to their initial position, and incorporates scavenging and supercharging configurations to cool the pistons and magnets, enhancing heat transfer and reducing heat generation through hollow pistons and fins, while allowing for efficient electric current generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional linear alternators with free pistons are used, then electric current generation is achieved, but heat generation is high and cooling of permanent magnets is insufficient
Solution Approach 1:
The patent converts the harmful heat generated during combustion into a beneficial cooling mechanism by directing combustion gases through hollow pistons and heat exchangers to cool the permanent magnets. The heat that would otherwise be waste is now utilized to maintain optimal operating temperatures of the magnets, thereby resolving the contradiction between heat generation and electrical current generation.
Solution Approach 2:
The patent implements nested cooling channels within the hollow pistons, where cooling passages are embedded inside the piston structure itself. This nested arrangement allows cooling fluid to flow through the pistons directly, efficiently removing heat from the permanent magnets while maintaining compact engine geometry and supporting continuous electrical current generation.
2Ease of operation
If opposed pistons with return members are used, then piston return to initial position is achieved, but device complexity increases
Solution Approach 1:
The return members are designed to automatically return the pistons to their initial positions using stored elastic energy from the combustion process itself. The system is self-regulating and requires no external control mechanisms, reducing operational complexity while maintaining effective piston reciprocation for continuous current generation.
Solution Approach 2:
The return members serve multiple functions: they provide the restoring force to return pistons to initial position, store elastic energy from combustion, and contribute to the overall structural framework of the engine. This multi-functionality reduces the need for separate dedicated components, thereby reducing device complexity while ensuring reliable piston operation.
3Temperature
If scavenging and supercharging configurations are incorporated, then cooling of pistons and magnets is enhanced, but device complexity increases
Solution Approach 1:
The patent merges the scavenging and supercharging functions into a single integrated system where the same mechanism serves both to cool the pistons and magnets and to enhance the engine's power output. By combining these functions, the patent reduces the number of separate cooling systems needed, thereby managing device complexity while achieving effective cooling for sustained electrical current generation.
Solution Approach 2:
The scavenging and supercharging system is designed to operate continuously throughout the engine cycle, providing uninterrupted cooling to the pistons and permanent magnets. This continuous operation ensures that heat removal is maintained without interruption, supporting consistent electrical current generation despite the added system complexity.
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 improves engine efficiency by reducing heat generation, maintaining magnet performance, and increasing electrical current output through effective cooling and scavenging, resulting in enhanced power generation and reduced moving parts.
Implementation Method 1
Each of a pair of return members is disposed within a respective one of the outer chambers, and each of the return members is configured to return respective ones of the pistons to a respective first position from a respective second position after combustion
Implementation Method 2
incorporates scavenging and supercharging configurations to cool the pistons and magnets, enhancing heat transfer and reducing heat generation through hollow pistons and fins
Implementation Method 3
By positioning a magnet or magnets upon one of a wall of the cylinder and the piston and the windings upon the other of the cylinder wall and the piston, linear translation of the pistons creates induction and a resulting flow of current from the windings
Data Source
AI summary
A free piston linear alternator includes a cylinder having a pair of outer chambers, a pair of opposed pistons and a combustion chamber disposed between the opposed pistons. Each outer chamber is disposed between respective ones of the pistons and a respective outer end of the cylinder. The pistons are axially opposed from each other and independently generate electric current when each of the pistons linearly translate. Each of a pair of return members is disposed within a respective one of the outer chambers, and each of the return members is configured to return respective ones of the pistons to a respective first position from a respective second position after combustion.