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Thread: current ratings of an arbit stepper motor

  1. #1

    Default current ratings of an arbit stepper motor

    i have a pair of SANYO DENKI NEMA 17 motors 41mmX41mm. (code:103-548-0250). i brought them from a scrap market in delhi for Rs. 100 each. the problem is there is no mention of ratings on it. all it says at the back is 3ohm/winding and 1.8degrees /step. i tried looking on net for a long time to find the rarings, but cud not get it. sanyo denki did not reply either. Since it is the 1st time i m working with steppers, cud somebody who has used these pairs before please help me with the voltage and current ratings for the same? i am using them for a maze solving robot.

    a photo of it is on tha site:


  2. #2


    Generally 3 ohm steppers are for 5 volts...

    As far as i know...

  3. #3



    which wud mean a current consumption of around 1.67 A per motor, i guess.... i planned using ULN2803 before but as they have a max cureent rating through one darlington pair to be around 500mA, what do u suggest i use??? also what voltage should i drive them at?? should 12 V DC be good enough? i need to make a mobile robot....

  4. #4

    Default Chopper circuit...

    I have not used 3ohm stepper motor but have friends who do so...
    So trust at your own risk...

    Nevertheless the way to drive a higher current rating motor is usually chopper drive...(Google for it...lots of resources)
    This circuit restricts the current through the stepper to a settable value using a higher voltage than rated...So it should work fine for your case...

    Btw what IC u suggestion is you use L297/298 Check its datasheet...

  5. #5


    i have unipolar stepper motors, instead of going for L298, i plan to go for UCN5804. its datasheet says it will be pefectly fine. although i am also looking at UDN2544 as an option. seems to be a pretty good IC, as its datasheet says. but then probably vikas has used 5804s earlier, so i think i can rely on them. (the brilliant micromouse tutorial mentions it.). i think current limiting resistance with 5804 might do a good job for me.

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