2A current for 1.25A stepper

[ACME]

can we use 2A current for 1.25A bipolar 4 wire stepper motor?

when my controller box cannot adjust it to lower current, any idea?

my controller(driver box) output current is 2A, my stepper motor is 130oz 1.25A.

or it doesn't matter! we can use 2A for my motor!

thanks

[Konstantin]

Use current limiting resistors.
Try Steppercal software.
or compute the values yourself, there is a thread somewhere about that. Or read http://webpages.charter.net/pminmo/OS3unipolardata.pdf.

Also, is your motor 1.25A per phase or total?


Konstantin.

[ESjaavik]

Too little input data.

If your drives are chopper drives, current limiting resistors won't work. The drive will just pour on more voltage to get the dialled in current. And if you choose big enough resistors it runs out of volt, you have lost torque and have a very expensive electric heater.

It may be worth a try to connect resistors in parallel with your windings. That would not limit the current, just convert some of it to heat outside the motor. In theory this should be a resistor with an inductor in series. Without the inductor your high steprate torque will probably suffer. I have never heard about such a connection, and have never tried it myself. So consider any attempt at this as an experiment.

More than this would be guessing, as you don't say what make/type of drive and motor you're talking about.

[ACME]

thanks all,
at the end, i found out my stepper is 2.2A 3.2v nema23 130oz(9.7 kg-cm) bipolar stepper motor not 1.25A,
and driver type is step/direct like A+ A-, B+ B-
sorry for wrong information...

so, that's mean no problem? (over 0.2A)

thanks again and sorry about that