Hello all,
I am building a small permanent magnet alternator from a used AC servo motor.
The windings are being replaced at the moment.

When I come to drive the unit for the first time, How will it be possible for me to know when I reach this particular units optimum max. load without gaining any nasty smells ?

Many thanks for any help.

 

Draw a current less than the maximum current the motor is rated.

 

mik,
All motor winding has been removed & is being replaced with heavier 1.5mm wire. All coils will be in parallel & the three phases in Delta.

Should it not be considered a different animal to the original ?

The output will then be wired to a 150amp rectifier.

I should have stated this sooner.

 

A 1.5mm wire is able to handle about 3 Amps.

Coils in parallel are not a good idea because a small phase shift or difference in voltage will cause currents to circulate between them and heat them.

Also, a delta connection in a generator is not a good idea for the same reason as before. Better to connect them as Wye.

 

Thanks mik, You have given me serious food for thought.

 

I,m out of my depth here.

I will try & describe the dimensions of my project.

Permanent magnet rotor has magnets diameter of 50mm, magnet length of 120mm, 6 poles, the drive shaft diameter is 19mm.

Laminate dimensions are 52mm i.d. 88mm o.d. length 120mm.
18 segments.

If you gain sufficient from the proportions I have given here, is it possible for you to give me a rough suggestion of numbers of windings, etc. (1.5mm wire)

Alternator is to be engine driven.

I am hoping to gain high amps, low voltage to supply load to hydrogen cells.

 

I am sorry but I am not a motor designer. I could give approximations but I won't.

 

I understand. Thankyou for your input.