Help Me Figure the Specs of My Motor.

[cbcnc]

I have a stepper motor that seems to have promise as a good motor but, I know very few of the specs.
Can you guys help me?

Here is what I know and how I know it:
Nema 23, 8 wire motor - visual
2.4 ohms/coil - I measured it
4.3 volts - Label
1.8 amps/phase - Label
120 oz/in unipolar - I measured it,
- Piker controller @24 V w/10 ohm resistor - each phase.

I would like to know how much holding torque it has in a bipolar series and parrallel. I don't have a bipolar board and so I wanted to power it up direct to measure the holding torque. How big should my current limiting resistors be for both series and parrallel?
Thanks for your comments.

Chris

[ger21]

120 * 1.4= 168 oz-in bipolar.

Bipolar series should be about 1.25a, 6V. Bipolar parallel about 2.5a, 3V

[cbcnc]

Gerry,

How did you figure the 1.25a, 6v in series and 2.5a, 3v in parallel? Is there a formula?

Chris

[ger21]

Bipolar series amps is unipolar amps x 0.7, volts is unipolar volts x 1.4


Bipolar parallel amps is bipolar series x 2, OR unipolar amps x 1.4, volts is bipolar series volts /2, OR unipolar volts x 0.7

Bipolar series ohms is unipolar x 2, parallel is unipolar/2, series is 4 x parallel.

This may only apply to 8 wire motors, not sure.