Opposed-Piston Linear Alternator With Resonant Compression Control
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Solution Overview
Problem
Existing electromagnetic generators, such as rotary turbines, are inefficient and expensive to maintain, while crankshaft engine-driven generators offer better efficiency but lack simplicity and power density.
Innovation Solution
A resonant free piston engine generator system with opposed piston assemblies and linear electromagnetic machines, utilizing flexure springs for high frequency operation and variable compression ratios, combining the advantages of rotary turbine and crankshaft engine systems to achieve high efficiency and power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotary turbine electromagnetic generators are used, then reliability and simplicity are improved, but efficiency deteriorates and manufacturing/maintenance cost increases
Solution Approach 1:
The patent replaces the traditional rotary mechanical conversion system with a linear electromagnetic generation system. The linear alternator directly converts the linear reciprocating motion of the piston into electrical energy without requiring rotary mechanical components, thereby eliminating mechanical losses while maintaining system reliability.
Solution Approach 2:
The patent changes the operating parameters by operating the linear alternator at resonant frequencies (10 Hz to 120 Hz), which optimizes the electromagnetic coupling and energy conversion efficiency. This frequency-based parameter adjustment enables high efficiency while maintaining the simplicity of the linear design.
2Loss of energy
If crankshaft engine-driven electromagnetic generators are used, then generation efficiency is improved, but device complexity and power density deteriorate
Solution Approach 1:
The patent extracts and eliminates the crankshaft mechanism from the system. By directly coupling the linear piston motion to the linear alternator, the complex rotary conversion mechanism is removed, reducing device complexity while maintaining high power density through direct energy conversion.
Solution Approach 2:
Instead of converting linear motion to rotary motion and then to electrical energy (traditional approach), the patent inverts the process by directly converting linear motion to electrical energy through the linear alternator, thereby simplifying the system architecture.
3Loss of energy
If crankshaft engine-driven electromagnetic generators are used, then generation efficiency is improved, but power density deteriorates
Solution Approach 1:
The patent replaces the rotary mechanical system with a linear electromagnetic system that directly converts linear piston motion into electrical energy. This substitution eliminates mechanical transmission losses and enables higher power density through more direct energy conversion pathways.
Solution Approach 2:
The patent employs dynamic operation at variable frequencies (10 Hz to 120 Hz) and variable compression ratios to optimize power output. The resonant operation mode allows the system to dynamically adjust to load conditions, maintaining high power density across varying operating conditions.
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 system achieves over 55% efficiency with operating frequencies from 10 Hz to 120 Hz, suitable for distributed electric generation and hybrid electric vehicles, offering reliable and cost-effective high energy density electrical power generation.
Implementation Method 1
a linear electromagnetic machine attached to the same axis as the piston assembly... capable of converting the mechanical energy from the linear motion of the pistons to electrical energy
Implementation Method 2
a resonant driver mechanism that can provide compression during the compression stroke
Implementation Method 3
utilizing flexure springs for high frequency operation
Data Source
AI summary
Various examples are provided related to opposing piston synchronized linear machines. In one example, among others, an opposed piston synchronized linear machine includes a linear engine having opposed piston assemblies including two pistons that move linearly in opposite directions along a longitudinal axis of a central cylinder; first and second linear electromagnetic machines coupled at a proximal end to the piston assemblies; and a resonant driver assembly that provides compression during a compression stroke of the linear engine. The first and second linear electromagnetic machines can convert linear motion provided by the two pistons to electrical energy in a generating mode. The opposed piston assemblies can be synchronously controlled to generate a compression ratio sufficient to combust fuel in a combustion chamber of the central cylinder.