Linear Generator with Reciprocating Magnet Piston
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Solution Overview
Problem
The existing linear power generation systems with free-piston engines and linear generators have complex structures, high costs, inefficient power generation, and excessive space requirements due to the series connection of components.
Innovation Solution
A linear generator design featuring a fluid pressure cylinder with alternately applied fluid pressures in left and right chambers, utilizing a permanent magnet band and electromotive coil band, where the piston with a permanent magnet reciprocates to induce power generation, and can be driven by fuel combustion or external high-pressure fluids, with the option of a cylindrical piston structure and pressure-receiving end plates for reduced weight and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the free-piston engine and linear generator are connected in series with separate components, then the system can achieve power generation through combustion, but the structure becomes complicated and the occupied space increases excessively
Solution Approach 1:
The patent merges the free-piston engine and linear generator into a single integrated unit. The piston serves dual functions: as the moving component of the engine and as the moving magnet of the generator. The combustion chamber and fluid pressure chambers are combined within a single cylinder structure, eliminating the need for separate engine and generator components and reducing overall system complexity.
Solution Approach 2:
The piston is designed with multi-functionality, serving both as the power-generating element of the combustion engine and as the moving component that induces electromagnetic generation. The permanent magnet band on the piston enables it to function as both the engine's moving part and the generator's rotor, allowing one component to perform multiple roles simultaneously.
2Power
If the piston is moved in one direction by burning and explosion and in the other direction by the motor, then power generation can be achieved, but the power generation efficiency becomes low
Solution Approach 1:
The system uses periodic alternating pressure application to both ends of the piston, creating continuous reciprocating motion. High-pressure fluid is alternately supplied to left and right fluid pressure chambers, ensuring the piston moves back and forth continuously, maximizing the frequency of power generation cycles and improving overall efficiency.
Solution Approach 2:
The design ensures continuous power generation by maintaining constant reciprocating motion of the piston through alternating fluid pressure application. The permanent magnet band continuously interacts with the electromotive coil band during each stroke, ensuring that useful electromagnetic induction occurs during both the forward and backward movements of the piston, eliminating idle periods.
3Weight of moving object
If a cylindrical piston structure with pressure-receiving end plates is used, then the weight is reduced and the permanent magnet is protected from impact and heat, but the manufacturing complexity increases
Solution Approach 1:
The piston structure employs nesting by placing the permanent magnet band inside the cylindrical piston body, with pressure-receiving end plates at both ends. This nested configuration protects the permanent magnet from external impacts and heat while maintaining a compact, lightweight structure. The end plates serve as protective shields without significantly increasing the overall piston 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 simplifies the generator structure, reduces size and weight, and achieves stable and efficient power generation while protecting the permanent magnet from impact and heat.
Implementation Method 1
The piston having the permanent magnet band reciprocates in the axis direction, whereby the power generation in the electromotive coil band is induced
Implementation Method 2
The piston is moved in the axis direction by the fluid pressure generated by burning and explosion of fuel in the combustion chamber
Implementation Method 3
a high-pressure fluid is supplied alternately into the left and right fluid-pressure chambers from outside, and the piston is moved in the axis direction by the fluid pressure of the high-pressure fluid
Data Source
Figure 1
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Figure 3
AI summary
Provided is a linear generator which ensures efficient power generation stably while achieving a simplified structure and a reduced size and weight of the generator. The linear generator has a fluid pressure cylinder structure for reciprocating a piston (6) in a cylinder (1) in the axial direction by applying alternately a fluid pressure in a left fluid pressure chamber (4) in contact with the left end wall (2) of the cylinder (1) and a fluid pressure in a right fluid pressure chamber (5) in contact with the right end wall of the cylinder (1) to the piston (6), wherein a permanent magnet band (9) is formed between the left pressure receiving surface (7) in contact with the leftfluidpressurechamber (4) of the piston (6) and the right pressure receiving surface (8) in contact with the right fluid pressure chamber (5) of the piston (6), and an electromotive coil band (11) provided over the left and right fluid pressure chambers (4, 5) is formed on the cylindrical wall between the left and right end walls (2, 3) of the cylinder (1) so that power generation in the electromotive coil band (11) is induced by the reciprocating movement in the axial direction of the piston (6) having the permanent magnet band(9). The piston (6) further includes end plates (14) that define the left and right pressure-receiving surfaces and a permanent magnet tube body (6') which constitutes the magnet band (9) is radially magnetized along an entire length thereof.