1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

Servo 24BYJ48-01A 8V DC 1/16 How to test it ?

Discussion in 'Robotics & Mechatronics' started by april, Nov 11, 2013.

  1. april

    april Member

    Joined:
    Mar 12, 2012
    Messages:
    250
    Likes:
    20
    Location:
    Cairns Great Barrier Reef -QLD-Australia
    The above stepper motor comes from a generator and controls the diesel pump which fuels the injector

    It appears not to be working and ,as replacement parts for these chinese machines are difficult and time consuming to source, I wonder if someone could guide me so I might at least check that it does not work first, before I attempt to renew it. If it works I can move on to look for other causes.

    I have Arduino boards available and C programming ability, but I want to approach this carefully knowing something about this part and feeding it 8 volts means a separate power source anyway. Is there a quick easy test to see if it is responsive ?

    The diesel motor itself starts and revs to full revs then cuts itself off. It seems to be checking that the servo turns the fuel pump down so the controller has control of the speed and shuts itself off when it finds it does not . I did not see the servo move at all in this time frame. When running properly I can see the servo moving.

    Oh and I should add its a four wire job . Red and black for power white and blue for pulse and position sense I assume.
     
    Last edited: Nov 14, 2013
  2. picbits

    picbits Well-Known Member

    Joined:
    Jan 29, 2007
    Messages:
    2,003
    Likes:
    95
    Location:
    Northants, United Kingdom
  3. alec_t

    alec_t Well-Known Member Most Helpful Member

    Joined:
    Jul 10, 2011
    Messages:
    9,259
    Likes:
    1,218
    Location:
    Cardiff, Wales
    Could be a bipolar stepper; two windings each having a respective pair of wires.
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. april

    april Member

    Joined:
    Mar 12, 2012
    Messages:
    250
    Likes:
    20
    Location:
    Cairns Great Barrier Reef -QLD-Australia

    Hmm yes only 4 and the colours are red black blue and white and the voltage differs from your data sheet as it is 8V , also it says 1/16 which is different again

    All help appreciated ,just want to test it
     
  6. alec_t

    alec_t Well-Known Member Most Helpful Member

    Joined:
    Jul 10, 2011
    Messages:
    9,259
    Likes:
    1,218
    Location:
    Cardiff, Wales
    Measure the resistances between the 4 wires. My guess is you'll identify 2 windings and they'll have matching resistances.
     
  7. april

    april Member

    Joined:
    Mar 12, 2012
    Messages:
    250
    Likes:
    20
    Location:
    Cairns Great Barrier Reef -QLD-Australia
    So if this is the case how do I test it then?
     
  8. alec_t

    alec_t Well-Known Member Most Helpful Member

    Joined:
    Jul 10, 2011
    Messages:
    9,259
    Likes:
    1,218
    Location:
    Cardiff, Wales
  9. april

    april Member

    Joined:
    Mar 12, 2012
    Messages:
    250
    Likes:
    20
    Location:
    Cairns Great Barrier Reef -QLD-Australia
    Hmm Thanks for your input but that just sends me back in the loop.
    I came and asked the question here because I googled the device and did not find what I need .
    I googled "testing bipolar steppers" when you posted that but still come back here to see if anybody knows how to test these rather than just read the coil resistance .

    I got to this at that stage to try to understand it but I actually want to test it so hoped someone here may already have done it

    http://circuits.blog.rs/blog/circuits/controllers/2012/10/17/bipolar-stepper-motor

    I don't want to destroy a part that may be fine.

    I am also looking here as a possible answer but that requires much work just to test a device but is great for an explanation

    http://arduino.cc/en/Tutorial/MotorKnob
     
    Last edited: Nov 16, 2013
  10. alec_t

    alec_t Well-Known Member Most Helpful Member

    Joined:
    Jul 10, 2011
    Messages:
    9,259
    Likes:
    1,218
    Location:
    Cardiff, Wales
    We can't say how to test it until we know for sure what the coil arrangement and coil resistances are :confused:
     
  11. april

    april Member

    Joined:
    Mar 12, 2012
    Messages:
    250
    Likes:
    20
    Location:
    Cairns Great Barrier Reef -QLD-Australia
    Alright-We are getting a bit "Regal" with the "we" arn't we?
    2 windings 50hms on each No other connections between the 4 wires

    I found I had an adafruit motor controller shield for my Arduino board so I downloaded their software as advised and put a stepper motor tester on my arduino chip (an atmega328P)
    Running the program I have at least confirmed that this motor is not at fault as it seems to step all the way round just fine .Had fun with another printer stepper motor with 6 wires I had saved too Cheers
     
  12. alec_t

    alec_t Well-Known Member Most Helpful Member

    Joined:
    Jul 10, 2011
    Messages:
    9,259
    Likes:
    1,218
    Location:
    Cardiff, Wales
    LOL. Several people have contributed to this thread, so 'we' is appropriate.
    Good to hear you've got the motor working.
     

Share This Page