Re: [CAD_CAM_EDM_DRO] Needed, consistant speed from control/motors or both???

If half the motor phases are named Aa, Ba, where Aa and Ba share a
common connection to the power supply, then if Aa and Ba are ever on at
the same time, you need a separate resistor on each winding.

What is the resistance per phase? The auction says the maximum current
is 2 amps, which sounds high to me for 80 oz in motors.

The formula to calculate the resistor value is:

power_supply - motor_voltage
-------------------------------------------
motor_current

Using your example:

12 - 6
--------- = 3 ohms
2

Again, that sounds like to much current for this size motor.

It is possible to get better performance by using a higher power supply
voltage, and larger resistors, or a chopper current source.

Regards,
JJ

On Saturday, December 13, 2003, at 09:30 PM, Neil wrote:

>
> I have this controller(site link below.
> http://www.stepper3.com/31.htm
>
> With these three stepper motors.
> http://cgi.ebay.com/ws/eBayISAPI.dll?
> ViewItem&item=2580852193&category=42920&rd=1#ebayphotohosting
>
> I'm powered with a typical XT PSU.
> Motors are rated for 6v. and with two poles I'm hooked in at 12v for
> each motor -w- power resistors on the + legs.
>
> I'm using Kcam4.0
>
> I've been told I should reverse my connections and replace the two
> resistors on the 2 +legs and place resistors on the 4 -legs???
>
> Or should I be thinking about completely removing the + legs from the
> board and have them powered by each their own power supply?
>
> I'm reluctantly thinking about other controllers and motors if need
> be, But I was initially very impressed with the combination as
> assembled above. But I have been lead to believe It can do better.
>
> If I set the software to run the motors any faster than 7-IPM, they
> start to stutter. But for most applications 7-IPM is pretty slow.
>
> TIA
> for any suggestions
> Peace
> and Merry Christmas.
>
> Neil
>
>
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