go_away

Author Topic: I NEED HELP WITH STEPPER MOTOR~  (Read 467 times)

0 Members and 1 Guest are viewing this topic.

Offline George221Topic starter

  • Jr. Member
  • **
  • Posts: 10
  • Helpful? 0
I NEED HELP WITH STEPPER MOTOR~
« on: January 30, 2013, 05:25:53 PM »
i got few stepper motor from robotshop :   12V 0.68A 125oz-in Unipolar Stepper Motor

(http://www.robotshop.com/ca/rbsoy14-soyo-unipolar-stepper-motor.html)

Question: i wanna control it that it can move both direction, so i tried to use darlington array uln2004A
                but the collector-current rating is 500 mA. will this burn when driving 0.68A stepper.

                is there another darlington array with higher current rating ? or other way to drive this stepper in both directions.
               

Offline waltr

  • Supreme Robot
  • *****
  • Posts: 1,943
  • Helpful? 98
Re: I NEED HELP WITH STEPPER MOTOR~
« Reply #1 on: January 30, 2013, 09:41:54 PM »
You can use discrete MOSFET, Bipolar or Darlington transistor instead of an array. An arry is not needed for bi-directional control of a uni-polar stepper motor.

Try googling 'uni-polar stepper drive' for lots of circuit examples.

Offline jwatte

  • Supreme Robot
  • *****
  • Posts: 1,343
  • Helpful? 81
Re: I NEED HELP WITH STEPPER MOTOR~
« Reply #2 on: January 30, 2013, 09:44:41 PM »
Pretty much all motor drivers these days use MOSFET transistors.

Because your motor is unipolar, you need four transistors. Four N-channel MOSFETs will work just fine, and you can buy power MOSFETs with logic-level I/O for about $1 each from places like Digi-Key. Adafruit also sells them.

You could also get a dedicated unipolar motor driver circuit, but I don't think you'd get anything out of that that you wont' get out of just discrete MOSFETs.

 


Get Your Ad Here