On Mon, Aug 16, 2010 at 12:10 AM, RussellMc <apptechnz@gmail.com> wrote:
> What Sean said .
> But, if you wanted to run them on 24V you would need 60 Watts of
> "inverter" 'standing on top of the battery'. And, if you had been
> going to do power or speed regulation with PWM you could produce
> voltages from 12 to 24v by varying the inverter output voltage.
>
> You can get laptop supplies which provide eg 19V from 12V. These are
> relatively well priced for what they do.

Do not forget that a laptop power supply is usually rated at 3A or so.
But a DC motor may have a starting current 10x greater than the
nominal.


Vasile


You can roll-your-won for
> less in parts but unless you are making more than a few these units
> may offer an easy way to do it.
>
> The rated wattage of laptop supplies includes the battery 12V input
> when running so you'd want one of the larger ones - say 10Watt.
> You could use one of these and PWM the moor drive from there.
>
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Russell
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