Re: Increased power to Gecko 201's

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Ron K <godsone@e...> wrote:

> Hi All
> I have a question for the electronic minded in the group , I have a
> Bridgeport clone about 20 years old it has 3.1 Volt 6.2 amp 1100

oz.

> steppers on it and I'm running it with 3 Gecko 201's at 38 Volts (

full

> load ), I just acquired a transformer that will give me 70 Volts

dc. ( a

> little higher than I hoped for )
> What kind of increase in speed and or torque would this give me.
>
> Thanks
> Ron

Most of the increase will be in top speed (RPM). By pushing the
upper end of the speed curve up there might be a little more torque
in the center part of the curve. The numbers will not double with a
doubling of voltage. If you are maxed out on RPM with the 38 volt
supply and need better rapids then the higher voltage should let you
spin the motors faster. Since the current is limited to the 6A number
the average total power to the motor is not increased that much since
the voltage waveform pulse will be shorter (albeit taller). Power is
defined as the area under the curve of the waveform. There is some
vector math involved because of the inductive load.

If this were servo's you could get more total power since the current
would not be fixed at a low level. On servo's doubling the voltage
will double the speed and as long as you stay under the rated
maximums also increase the motor current/torque.