Re: Stepper Motor Power supply.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "fortino" <fortino_tan@h...>
wrote:

> Ron,
>
> Nemic lambda is a switching power supply. It is a nice power

supply. It has

> thermal, current, & voltage protection. As long as you calculate

your

> voltage and current are within the capability of the power supply,

I think

> you won't see any problem. My dyna used Nemic lambda power supply

(EWS

> 300-48). I haven't had any problem with it so far.
>

There is nothing wrong with using a switching power supply for
steppers or servos. A lot of the "self contained" motor drivers will
run directly from 120VAC and have their own internal switcher supply
for the DC. You may find the dynamic charastics of a switcher may
require a large filer cap on the output to deal with the pulsating
current requirements of steppers but anything that puts out the
required amount of DC, regulated or unregulated will work fine. I
would recommend you go ahead and fuse each motor driver seperately
even thought the PS has current limiting. The addition of the large
filter cap will negate the current limit of the supply to a large
extent. While the need for an expensive, regulated, current limited
power supply for running DC motors does not exist, a lot of times you
can find surplus high end power supplies below what the components
cost otherwise. Always vote with your wallet! Usually the problem
comes in finding a regulated power supply with high enough output
voltage to approach the 10 to 20 times nameplate voltage spec that is
recommended for optinal performance. About the highest voltage
switcher I run across is 48VDC (phone company stuff) and that works
for some 2 and 3 volt steppers it would be less than ideal for
anything with a much higher nameplate voltage...unless your goal is
not max RPM and torque.