VERY O/T any one know a lot about transformers and inductors ?
Turbo Mini Forums

as per title !

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

a bit,

but i suspect Will H is your man with his train expertise.

wil !!! is this true ??

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

May be able to help too

Is that something like a flux capacitor?

Are you trying to get that lathe working then Robert?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I suspect that I don't know the answer, but you could always ask. I wouldn't profess to know a lot but I know people who do.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

There's no easy way of getting 3ph from a 1ph supply without some electronics gizmo. When you say 3ph transformer do you mean invertor? I have a lathe with a 3ph 415 motor, I bought a 1ph 240 to 3ph 240 invertor for about 200 quid and then rewired the motor from delta to star so it would run on 240.
I've seen 3ph motors running on 1ph by using a suitable sized capacitor between two of the phases but they run REALLY badly!

Edited by neilj1678 on 28th Sep, 2007.

Here you go:



or

Edited by Paul S on 28th Sep, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Got that the wrong way round... was originally star and I had to rewire it as delta. Invertor wiring is pretty simple, should look something like this:

IIRC the peak to peak voltages for 230v single phase & 415v 3 phase are exactly the same (the 230v & 415v purely relate to the rms values) you'll struggle to get three phase from a single phase supply, as it involves phase shifting which is a PITA, it's not impossible, but you're better off changing the motor to a single phase one.

As an aside most modern housing estates are wired with every third house on the same phase.

Ahh, I think I get you, you're converting 1ph 230 to 3ph 230 with your rotary converter and then using the Tx to go from 230 3ph to 415 3ph?
Is that a 3 ph inductor you've got then, i.e. 6 terminals?

Edited by neilj1678 on 28th Sep, 2007.

yes neil thats right its a 3 ph inductor , .31 mH which is mega henrys , i think ,and total pk current of 200 amps ,,,,er ,think thats big enough haha .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

thanks for that axel , but thats not the route i chose to go down .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Millihenrys if it's a small h, if it was mega I think it would be the size of a house! It won't affect the voltage or the 50hz waveform at all, but it will give you a 90 degree (in theory) phase shift between the voltage and the current (pretty irrelevent really) and it will tend to filter out some higher frequency noise.
They're normally used to stop any high frequency noise generated by the motor getting back into the 230v supply, so it's a filter in essence.

yep your right neil small h ! from what iv been reading it appears that it should act as a) a waveform smoother
B)a form of slight resistance using this formula Xl=2piefl
where Xl is ohms
f=frequency
L=induction in henries
so
Xl=2*3.14*50*.31
=97.31 ohms
hmmmmm!

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Nearly right, 1 Henrie = 1000 milliHenrie.
So Xl=2*3.14*50*0.00031=0.097 ohms.
If your motor pulled say 8 amps, you'd get a voltage drop across the inductor of 8*0.097 = 0.78v. In reality it would be a bit more than this because there would also be a bit of internal resistance in the inductor, probably a couple of volts drop at max.

Anythink to do with autobots and decepticons?

Back once again like a renegade master

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

It's a bit high but within 10% (just) which is generally considered acceptable. You might find your motor is stamped up as 415/440 anyway in which case it's only 15v high. Also, can you rig up your invertor to chuck out a little less than 220 so you will get less than 455 out of the Tx?

415v to 240v transformers only use two of the three phases. you cannot simply use the secondary as the primary and generate three phases, you will however get 415v.

I would have suggested three 240v phase shift transformers, whereby the same 240 volts supply frequency is shifted 1/3rd and 2/3rd respectively

How this is achieveble, i dont know, but i have heard of phase shift transformers

Edited by Sprocket on 29th Sep, 2007.

I was assuming it was a step up Tx as the post said 220 to 455 but you've got a good point Mr Sprocket.
Robert, what connections have you got on the Tx, have you actually got enough to confirm it is 3ph in and out?
If not, why not just do your invertor thingy to give you the 3ph 230 and then see if you can wire the motor up as delta? They are normally easy to change by moving links inside the terminal box, the motor data plate should give you some info.

Edited by neilj1678 on 29th Sep, 2007.

One thing to bear in mind is that your single phase supply may not be able to supply the required current if the 3 phase motor is a bit of a monster.