Motor Control

Discussion in 'The Projects Forum' started by urb-nurd, Aug 25, 2014.

  1. urb-nurd

    Thread Starter Member

    Jul 9, 2014
    269
    3
    Hey guys, so i need to try control a motor.
    I would like to be able to control its speed in continuous rotation.
    However i would also like finer control so that i can make the motor rotate a set value then reverse.
    I was thinking a stepper motor would suffice however that adds some extra bulk to my unit.

    Is it possible to get this sort of control with a h-bridge?
    Rather than a stepper with a little PIC for sequencing
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,565
    2,379
    For accurate speed or position, some kind of closed loop feedback is needed such as a PID loop unless something like a stepper is used, especially if the load is varying in nature.
    Max.
     
  3. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    And depending on the torque/power needed there a some pretty small stepper motors. Most all of the cars made today have stepper motor gauges in the instrument panel. And they are tiny.
     
  4. urb-nurd

    Thread Starter Member

    Jul 9, 2014
    269
    3
    Thanks for that, seems to me like a stepper would be less work for what i need.
    I guess i was just put of by the square nature of the beast haha.
    I like that cylinder
     
  5. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    Many older computer printers (inkjet) have small round stepper motors in them, and can be found either cheap or free. :)
     
  6. ligo.george

    New Member

    Feb 2, 2013
    19
    2
    You can use L293D to interface DC Motor with PIC Microcontroller.
    If you need to use high current DC Motors, you can make H-Bridge using POWER Transistors..
    You can use PWM (Pulse Width Modulation) to control the speed of DC Motor. By varying the PWM Duty Cycle, you can change the average power delivered to the motor.
    Try the following links :
    Interfacing DC Motor with PIC Microcontroller
    DC Motor Speed Control using PWM with PIC Microcontroller
    If you want to use stepper motor, try the following link.
    Interfacing Stepper Motor with PIC Microcontroller
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,565
    2,379
    Those links do not appear to show feedback to enable fine positioning, which the OP specified in his post.
    Max.
     
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