DIY - designing 200V generator

Sounds like homework to me. Aren't you meant to do that yourself?

Sylvia.

You could do that with a car alternator, a 3 ph stepup transformer and 3 phase bridge at the other side.

Why reinvent the wheel ?...

Regards,

Chris

In this century, the only sensible approach is an AC generator followed by a rectifier.

With such low powers, you should check how automobile alternators are designed. Controlling the rotor current will also control the total output current.

The alternator was my first choice but i dont get this part:

Controlling the rotor current will also control the total output current

- as far as i know alternator has maximum voltage output of 17V and the current is in range from 50 - 90A depending on alternator.

You could do that with a car alternator, a 3 ph stepup transformer and 3 phase bridge at the other side.

- i agree with you but my goal is to have such generator that will give upper defined output without additional transformers etc.

E.g. if you spin it with constant RPM of let say 80 and if you keep this RPM all the time, the output of the generator should be 200V / 2A.

Sounds like homework to me. Aren't you meant to do that yourself?

- i will try to do it myself but if i fail then i need to pass the specification to someone who is constructing such things.

This is untrue, so as such meaningless. The voltage in the field (rotor) controls the stator's voltage. Current is a factor of voltage and load. Voltage is determined by exciton voltage. Frequency is determined by RPMs.

An automotive alternator has a maximum voltage of (perhaps 17 volts) though that can vary from model to model.

If you must restrict yourself to a self-contained package, then rewind the stator (not the rotor!) Hint: you know (on disassembly) the number of turns for 14 volts nominal, so simple math will give you a ball park figure for the new windings. Oh, and new rectifiers will be needed with highter voltage ratings. But, you can 'reduce' that high voltage output to a lower voltage (say 14 volts) and perhaps even re-use the original regulator!

Let's say 8000 RPM, a more realistic number... But no, it would only stabilize the output frequency, not voltage. The regulator controls the output voltage, not RPMs. The current is a factor of what the windings can produce without overheating. Since a 100 amp alternator in an automotive application can produce about 1400 watts (maximum, typically they produce about half that) you should be able to generate about twice the power you are asking for.

I've given you clues to figure out how to do this as a practical experiment. Being a university professor, I won't tell you how to do the calculations, that was covered in class (if you are a student).