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You are here: Home / Topics / Driving stepper motors

Driving stepper motors

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Electronics › Electronics › Driving stepper motors

  • This topic has 7 replies, 2 voices, and was last updated 10 years, 10 months ago by Ashutosh Bhatt.
Viewing 8 posts - 1 through 8 (of 8 total)
  • Author
    Posts
  • July 17, 2014 at 7:44 pm #3169
    Robert Coe
    Participant

    Working on a project that will use a stepper motor, that will need to run at a preset rpm on power up.

    Am concidering using a NE555 in astable mode to provide step pulses to an  Easy Driver stepper motor driver board.

    My concern is that I’ve heard that steeper motors may be driven into resonance rather than rotating if driven without “ramping the step pulses” to the desired speed. (9200 to 55200 steps/minute)

    I prefer to avoid problems rather than run into them.

    Does any one have first hand knowledge or experience with this scenario?

    Any and all info greatly appreciated.

    Bob

     

    “The only truely stupid question is the one that wasn’t asked.”

     

    July 19, 2014 at 4:13 pm #11914
    Ashutosh Bhatt
    Participant

    Stepper motor can hv 4 coils or 2 coils. To rotate them pulses must be given in sequence. U can get the idea from tutorials on stepper motor.

    July 19, 2014 at 4:21 pm #11915
    Robert Coe
    Participant

    That is why I’m using the easy driver stepper motor driver.

    Please read the question fully when replying.

    July 23, 2014 at 6:21 am #11922
    Ashutosh Bhatt
    Participant

    i dont know what is Easy Driver stepper motor driver board. how it works how it functions. u can build simple stepper motor driver using IC555 and johnson counter and ULN2003A current driver chip that gives pulses in sequences to stepper motor to rotate it. the speed of motor can be changed by changing frequency of applied pulses from IC555.  you can not apply more pulses then max RPM of your motor.

    like if max RPM of motor is 6000 then you can not give more than 6000/60 = 100 pulses per second

    July 23, 2014 at 2:39 pm #11929
    Robert Coe
    Participant

    Thanks for your input.  The easy driver uses a stepper driver chip that has all the logic and drivers built in.

    All it requires is input for step size, direction and a step pulse.

     

    I’ve solved the ramping of step pulses by adding an RC circuit and a transistor between the timming resistors R1 of the astable 555 and Vcc, as the capacitor charges the transistor slowly turns on effectively ramping the frequency of the step pulses.

    I bread boarded the circuit and it work perfectly. The stepper motor slowly ramped speed, to the preset speed, set by R1, of the astable circuit without locking into resonsnce.

     

    July 24, 2014 at 11:17 am #11930
    Ashutosh Bhatt
    Participant

    thanks for your answer and also for posting the solution.

    i am especially thanking you because everybody just post the problems nobody posts the solution.

    one more thing. pls post the photo-snap of easy stepper motor driver board so that other can get idea of it

    July 24, 2014 at 3:01 pm #11934
    Robert Coe
    Participant

    Here is a link to info about the Easy Driver (Stepper motor driver board). You will be able to find links to vendors there too.      schmalzhaus.com/EasyDriver/index.html

     

    July 27, 2014 at 6:49 am #11948
    Ashutosh Bhatt
    Participant

    thanks

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