How turn my 20hp motor into alternator?

[alterjasy]

Thank you very much Danf!

Hello everyone i am new among you!

Yes Hannu!... It was me.

Well, i want to turn my 15kw motor into alternator.

It is an asynchronous-induction motor: 15kw-20hp; 50hz; 1440rpm; 52amp/220v and 30amp/380v; 36 stator slots in which there are 60 wires of about .039 inch diam.

Wires come from slots 1-2-3 and enter into slots 10-11-12 and so on.

Diam. inside stator: 6.9 inch

Lenght stator: 5.3 inch

The stator seems to be unremoveable.

One slot is burnt on one inch lenght.

I wish to have 230 volt 3 phase output power by a gasoil engine for my sawmill.

So, here there is what i want to know:

• Magnets size and number? [on a lathed rotor or a new one]
  
• Diam. of the wire and the number by slots?
  
• Does the currently way of winding the wire on my motor is good?
  
  

Please, help me thanks.  

[bob g]

how big of a motor would you like to run off the converted generator?

if you are thinking of around 3 hp or so, perhaps converting the motor to an induction generator would be an alternative for you.

also not knowing where you are from, but does your motor currently have 9 wires coming out of it? or is it a world motor with 12 wires?

if it is a world motor you can configure it to 220 vac 50 hz at about 52 amp output by grouping the wires into double star and then paralleling them. if it only has 9 wires you can still do the same but will have to open the motor and find the star interconnection and bring out the lead for proper connection.

should you decide to go this route let me know and i can give you the connection information to achieve this outcome.

using capacitors to excite the induction motor it will generate in your case at about

1560rpm or so.

i am not sure that doing a neo mag conversion to the rotor would be a good match for you as there is no way to regulate the output to run other induction motors, at least not easily or cheaply.

perhaps a bit more info and someone might be able to help you

good luck

bob g

[Caballo]

Think, you need completely rebuild all the motor - recoil stator to build more poles (with more poles you will have bigger dH/dt with lower speed) and because its native coil is brocken (you said - One slot is burnt on one inch lenght), and, of course, COMPLETELY rebuild rotor, then balance it, afraid that would be much more faster and cheaper to buy brocken alternator and repair it.

Even to buy the new alternator would be cheaper.