Re: Power supply transformer setup questions...

> >
> >look at the total watts of the motors.
> >
> >The chopper drivers cannot supply more, even if you have such an

over

> >sized power supply.
> >
> >one motor is 9 watts
> >the other 2 total 29.4 watts for a grand total of 38.4 watts.
>
> You've lost a factor of 2 here - both coils get energised in each

motor, so

> the right number is 76.8 Watts.
>
> Regards,
> Tony
>
>
> >if you run at 60 volts, then the required current is 2.04 amps for
> >ALL 3 motors.
>
> Not quite - not sure where that came from. Current is Watts divided

by

> Volts. So 76.8/60 or 1.28 Amps is nearer the mark.

Using my origional post was wrong in that I used one the 29.4 watts
from the two 3.5 amp motors. 60 volts / 29.4 = 2.04

flipping between the spreadsheet and yahoo and rushing out to a
jobsite made for less than optimum conditions.


I'm going to have to go back and read some posts to get the power to
each coil part correct. I thought I had been correct that only one
coil FLA was used for sizing the power supply as both coils will
never be charged 100%, but rather some varying percentages that don't
exceed the FLA.

Dave

>
>
> >If you want to run 6.7 amps, you will have pleanty reserve.
> >
>
> That's certainly true!
>
>
> Regards,
> Tony