Re: can amps be mixed with motors?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "toolspindoctor"
<clarkfamily5@...> wrote:

>
> I have a used Yaskawa motor and amp. The motor turns out to be bad
> and needs to be replaced. It was a 500watt motor. Can I use a 750
> watt motor with an amp rated at 500 amps and just expect less than the
> rated power or will it blow the amp?
>
> thanks!
>

The draw of the motor is in voltage and amperage. You *have* to use
the right voltage, then the motor "demands" the amount of current
needed for the load. If you use the 750 Watt motor and place it in a
situation where it needs over the 500W the supply can furnish, the
best thing that can happen is that the amp has some form of protection
against overload and will just shutdown. If not you have a blown Amp.

If the 750 motor is rated at the same voltage as the old 500 and you
are confident the load will never exceed the 500 level (or the amp has
electronic overload protection) then it would work and actually not
run at less power than the old motor. Of course you can't get 750W
from a 500W (I assume you meant Watts instead of 500Amps!) supply. As
long as you don't ask it to then there should be no problem.

Watts is a measurement of power consisting of (roughly) the applied
voltage and the demanded power from the motor and it's load.

So the simple answer is that as long as you match the voltage of the
old motor and you don't let the load exceed what the old 500 Watt saw
it should work. This is a bit like putting a bigger fuse in when one
blows. It will work as long as things don't go into overload.

Tom Caudle
www.CandCNC.com