How Does Self-Excitation Work in Alternator Generators? Mechanical vs Electrical Energy

I run a small R&D consultancy in the UK. I research and build mainly proof-of-concept devices for inventors and small businesses (but I'm not myself an electronics or electrical engineer).  Many of my clients have no technical background. I presently have an enquiry from a person who I'm in dispute with regarding the purpose and function of alternator generators.

My prospective client believes that 'self excitation' means that the alternator can create energy. I have been trying my best to convince him that the electricity is generated by converting mechanical rotation into electrical energy. But nothng I can say will convince him:

He writes: "....My assessment .....is that:

a) Mechanical energy is not responsible for producing electrical energy in a generator. The process by which this is done is called excitation and by taking advantage of a principle of amplification whereby a small amount of electric power controls a large amount of power.

b) The principle of amplification works because the output voltage is proportional to the magnetic field which is proportional to the excitation current in a small=big relationship.

c) Your claim that my system will not work is stupid......" (etc)

His innovation seems to hinge on the belief that it is possible to create energy in an alternaor generator.

I have now given up on trying to explain the law of conservation of energy. I thought he might listen to one or two more qualified voices.

Any comments gratefuly received.

Thanks.

 

The excitation level determines the torque transmitted through the generator/alternator shaft and the work done. The excitation level itself does not create the energy, it just varies the strength of the magnetic field the coils are moving through. The higher the field density, the higher the induced amperage (for a constant rotation speed) and the more work the system providing the rotational energy does.