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Project using a strong 12 volt motor

Discussion in 'Sensors and Actuators' started by onlyblue, Feb 25, 2013.

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  1. onlyblue

    onlyblue

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    Feb 2, 2013
    Hi
    I have a new project that I need to use a strong motor (12 volts) and I need to control the speed.

    I have been thinking for a car wiper motor because it has lots of torque. I will use as a power source a car battery.
    What is the best way to control the speed of such motor?
    Please give me your advice
     
  2. BobK

    BobK

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    Jan 5, 2010
    PWM controller.

    Bob
     
  3. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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  4. onlyblue

    onlyblue

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    Feb 2, 2013
    Thank you all for your replies, I had already search on ebay before I post, but I was not certain if the motor will work with most of the PWM I had found.
    My concern is that the car does not use a PWM to control the motors. This is the main reason I had asked. Also my dilemma is which is the right one since they have different specs.

    1 http://www.ebay.com/itm/12V-DC-5V-4...481?pt=LH_DefaultDomain_0&hash=item416d8743b9

    2 http://www.ebay.com/itm/12V-24V-48V...308&pid=100010&prg=1076&rk=5&sd=150901337994&

    3 http://www.ebay.com/itm/12V-36V-24v...308&pid=100010&prg=1076&rk=2&sd=150901337994&

    4 http://www.ebay.com/itm/DC-Motor-Sp...994?pt=LH_DefaultDomain_0&hash=item23226baf8a

    5 http://www.ebay.com/itm/DC-12V-24V-...043?pt=LH_DefaultDomain_0&hash=item3ccf47928b

    This is the one I had in mind (since I want the reverse function) I suppose I can do it with the right switch
    6 http://www.ebay.com/itm/5V-30V-5A-R...308&pid=100010&prg=1076&rk=1&sd=150901337994&
     
  5. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    I would think that your motor draws less than 5A. Do you know what it draws?

    Chris
     
  6. onlyblue

    onlyblue

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    Feb 2, 2013
    No Chris, It only states 12 volts.
     
  7. Laplace

    Laplace

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    Apr 4, 2010
    Wouldn't the current drawn by the motor vary with the load placed on the motor? The highest possible current would be the stall current. In the car what is the rating of the fuse on the circuit with the wiper motor?
     
  8. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    That implies that the manufacturer shouldn't bother listing it on the data plate because it varies with the load. :)

    The ebay (10A) PWM model that I posted the link to should be fine because I doubt your motor will pull >10A.

    Chris
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Measure the DC resistance of the motor. That will allow you to estimate the stall current.
     
  10. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    Good idea Steve but he'd be wise to not rely on merely probe/touch contact to measure it.

    Chris
     
  11. CocaCola

    CocaCola

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    Apr 7, 2012
    A wiper motor isn't that big and the cheap PWM controllers should work fine, but if you go into a larger motor you look at 'scooter' speed controller an all in one package...
     
  12. onlyblue

    onlyblue

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    Feb 2, 2013
    I went back to the car junk and I have checked the fuse. it is 20Amps
     
  13. onlyblue

    onlyblue

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    Feb 2, 2013
    I measured the current (without load) and it was 2Amps. Then I had a installed a 5Amps fuse and I put a bit of load on the motor. The fuse burned, my multimeter not :)

    Thank you all for your answers. I will look for a smaller motor.
     
  14. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    That's not the only load on that fuse. I would fully expect your wiper motor to pull about 5 to 7 Amps loaded or at start.

    Chris
     
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