Efficiency of linear alternator

In summary, the efficiency of a system using a linear alternator or generator, in which an object with a permanent magnet attached moves along a linear track and interacts with the coils in the alternator, can reach up to 95%. Cheaper systems may have an efficiency of around 80%, while a more efficient free piston engine can reach up to 90%. This is not just an eddy current brake, but a system that can transform kinetic energy into electrical energy with minimal heat loss. The amount of initial kinetic energy that can be transformed to electrical energy depends on the specific system and its efficiency. For example, a 1 joule kinetic energy object colliding with a linear alternator with 95% efficiency could potentially transform 0
  • #1
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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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  • #2
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
 

What is a linear alternator?

A linear alternator is a type of electrical generator that converts linear motion into electrical energy. It typically consists of a stationary coil and a moving magnet or coil, and can be used to produce electricity in a variety of applications.

How does a linear alternator work?

A linear alternator works by using the principles of electromagnetic induction. As the magnet or coil moves back and forth, it creates a changing magnetic field that induces a current in the stationary coil. This current can then be harnessed as electrical energy.

What are the benefits of using a linear alternator?

One of the main benefits of using a linear alternator is its efficiency. Unlike traditional rotary alternators, which require complex mechanical systems to convert rotary motion into linear motion, a linear alternator can directly convert linear motion into electricity. This results in a more efficient and reliable energy conversion process.

What factors affect the efficiency of a linear alternator?

The efficiency of a linear alternator can be affected by several factors, including the speed and frequency of the linear motion, the strength and orientation of the magnetic field, and the design and quality of the materials used in the construction of the alternator.

What are some common applications of linear alternators?

Linear alternators have a wide range of applications, including powering hand-cranked flashlights, generating electricity from ocean waves or wind, and converting the motion of a piston in an engine into electrical energy. They are also commonly used in hybrid vehicles to capture energy from regenerative braking.

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