Please confirm my stepper voltage calculation?

[sco]

Could someone please verify that I have the calculations of voltage right for this motor that I bought?

It is a RS34-600oz stepper...2 phase

I am running it in Parallel from a Gecko 203V

The table below shows that the inductance of the motor in a parallel config is 1.2.
I have calculated (1.2 sqrt) X 32 = 35.05
So I bought a power pack that puts out 30 Volts and will supply 7 AMPS
The reason I ask, is that the company I bought the stepper from is telling me to run it at 50-60volts ( I think they are quoting the voltage for a series config.)

Am I correct with 30 - 35 volts in a parallel config, or am I wrong?


SERIES 3.7 V 3.5 A/phase inductance 4.8 +/- 20% mH/phase

PARALLEL 1.82 V 7.0 A/phase inductance 1.2 +/- 20% mH/phase

UNIPOLAR 2.6 V 5.0 A/phase inductance 1.2 +/- 20% mH/phase


Cheers
sco

[vintageracer]

You can run these steppers at 65-72volts no problem. I run my RS34-1200's at 65 and they run great.
It is important though not to run them at more than rated current. The 203V's are capped at 7.0 amps anyway, so you'll be fine.

Timothy

[sco]

Really!?!?
I do believe you, but how does that work with the 'gecko equasion'?
sqrt X inductance X 32.
Does that equasion calculate per phase and because there are 2 phases, you multiply the result by 2?

cheers
rosco

[vintageracer]

I asked the same questions when I first bought my stepper motors for my retro fit project. This is the reply I received;

"The 20X rule has been thoroughly debunked by now even though certain individuals still put it forward. It's based on an equation that doesn't take a number of important fact into account. I've been selling the 1200's for over four years and was advised back then by a good mentor to apply 65-70 volts with a G201 for the best upper speed torque. 54V is no problem and don't forget that stepper are made to be run hot, unlike servos."

So I bought a 65volt power supply and everything is working fine.

Timothy