4 kW DC excited synchronous motor

[luc28]

Hi,

for a project at my university, I am currently searching for an electric motor with the following specifications:

• synchronous 3-phase motor
• power of around 4 kW
• DC-excited (important!!)

We actually want to use it as a generator.
During the whole last week, I already searched a lot of sites and a lot of manufacturers, but I was unable to find any motor meeting all the requirements. Either they are permanent-excited models or they have a larger power rating.

Could anybody point me in the right direction, to a manufacturer or supplier maybe?

Thanks,

Luc

 

[Minder]

You don;t say whether voltage is important?
If this is just for demonstration/exercise purposes you could look at a automotive alternator, bit low on the desired, current but another source is shipboard alternators.
M.

 

[luc28]

The voltage is the standard european one, so 380V phase-to-phase, or 220V phase to ground.

 

[WHONOES]

A car alternator would be single phase but I guess you could run 3 together but then there would be issues with phase relationship.

 

[Minder]

A car alternator would be single phase but I guess you could run 3 together but then there would be issues with phase relationship.

Never seen a 1ph auto alternator??
All the ones I have owned in the UK and N.A. are all 3 phase, this for some decades now..
The OP is looking for a high voltage version evidently..
M.

 

[WHONOES]

Fair enough. I do know though that it is possible to get substantial voltages from car alternators.

 

[Minder]

If you run the field unregulated you can easily achieve in excess of 50vDC, I have done a few bench exercises with them.
As is normal in many generators, I tried to use self excitation but did not work.
M.