Re: [CAD_CAM_EDM_DRO] Re: CAD_CAM_EDM_DRO@egroups.com re: choice of steppers

Hi Mariss
This link is to the add for the steppers,, note the close up of the stepper label. Perhaps I am misreading it but it sure looks
like 12 to 300 V to me. That's why I did a double take on it and decided to ask you fellows.

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=488861450&r=0&t=0&showTutorial=0&ed=974174058&indexURL=0&rd=1

Bill

Mariss Freimanis wrote:

> Hi,
>
> Bill, check the motor's name plate rating again. 12 to 300 volts
> makes no sense at all. The voltage rating will be between 2 to 3
> volts.
>
> Also when using a microstep drive, set the current to the unipolar
> rating (6.7A in this case). DO NOT use the bipolar value (1.41 times
> unipolar). The iron will saturate and the motion will be rough at low
> speeds.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@egroups.com, BillDarby <ddarby@s...> wrote:
> > I was considering a pair of these Sanyo Denki steppers to go with
> the Gecko G201 stepper drivers because of the price
> > ($99ea)and power but I just now noted that the voltage rating for
> these is 12 to 300 volts (as per the actual motor
> > label)
> >
> > Now it is my understanding that the G201s max out at 80 volts and
> also that it is recommended to run the stepper at
> > something like 20/25 times rated voltage.
> >
> > Am I right in concluding that these would be a poor choice for use
> with the G201??
> >
> > Bill Darby
> >
> >
> > Sanyo Denki Step-Syn Universal Stepper Motor
> >
> > These Hybrid Stepper Motors have four Independent Windings with
> eight Leads that can be used in both Unipolar and
> > Bipolar Configuration. By Paralleling or connecting the Windings in
> Series the User can create either a Unipolar or
> > Bipolar Motor.
> >
> > Rating for Unipolar Full Step mode
> > Holding Torque=486 oz/inch (35Kg/cm)
> > Rotor Inertia=21.5oz/inch^2 (1.55Kg/cm^2)
> > Winding Inductance=2mh
> >
> > Bipolar will give You more Torque
> > Bipolar-Parallel will give you good High Speed Torque
> > Bipolar-Series will give you better Low speed Torque
> > As a general Rule the allowable Current through each Winding is:
> > For Bipolar- Series 6.7A x 0.707=4.74A
> > For Bipolar- Parallel 6.7A x 1.414=9.47A
> > were 6.7A is the Unipolar Rating
>
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