Efficiency of linear alternator

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SUMMARY

The discussion centers on the efficiency of linear alternators, specifically regarding the conversion of kinetic energy into electrical energy. A permanent magnet moving with a kinetic energy of 1 joule can theoretically convert up to 0.95 joules into electrical energy, reflecting an efficiency of 95%. However, cheaper systems may only achieve around 80% efficiency. The participant also mentions achieving 90% efficiency in their prototype, indicating that linear alternators can rival conventional rotating alternators in performance.

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Interesed in practical maximum efficiency of linear alternators. Suppose an object with a permanent magnetic attached moves along a linear track with a constant velocity, such that its kinetic energy is 1 joule. The object "collides" with a linear alternator or generator, such that the magnet interacts with the coils in the alternator. How much of the initial kinetic energy of the object could be transformed to electrical energy? Am I right in assuming about .25 joules maximum?
 
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You talk about the efficiency of such a system. In my opinion, there is no difference to a conventional rotating alternator, and such systems do have an efficiency that is better than 95%. So, you should get at least some .95 joules and only .05 joules of heat loss. Cheaper systems may be around 80% efficiency. But for an efficient free piston engine, you need more. I calculated some 90% for my prototype.

I mean, its not just an eddy current brake...


http://www.freikolben.ch
 

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