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Motor speed controller question.

Discussion in 'Sensors and Actuators' started by BenFett, Sep 20, 2014.

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  1. BenFett

    BenFett

    3
    0
    Sep 20, 2014
    Hey guys, so for a project I'm working on I need a speed controller for a single motor. I bought a PWM that I thought would work, but it's too high of voltage and doesn't affect the circuit. My project will be running at ~6V DC off of two batteries. So I'm looking for a way to have some sort of dial to change how fast the motor is turning. Anyone have any clue what would work for this?
     
  2. KMoffett

    KMoffett

    723
    75
    Jan 21, 2009
    Do you have a link to the PWM controller you purchased?

    Ken
     
  3. BenFett

    BenFett

    3
    0
    Sep 20, 2014
    http://m.ebay.com/itm?itemId=400569517437

    This is the one I purchased. I was recommended this by someone when I was first discussing this idea, and stupid me I didn't read the description... Haha. It requires 12-24 Volts.
     
  4. BenFett

    BenFett

    3
    0
    Sep 20, 2014
    I just found some batteries with high enough voltage to get this PWM to work, and it works fine with those, but I need a lot less power for this, since it's only running a single motor, and I'll fry the poor little thing with the 12 volts.
     
  5. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,271
    Nov 28, 2011
    You can use a 555 to produce a control signal with adjustable duty cycle, and feed this into a transistor or MOSFET. There are many versions of this idea out there:

    http://www.pcbheaven.com/circuitpages/PWM_Fan_controller_using_a_555/
    http://www.talkingelectronics.com/projects/50 - 555 Circuits/50 - 555 Circuits.html#9
    http://www.backyardaquaponics.com/forum/viewtopic.php?f=50&t=10775&start=45
    http://www.circuitdiagram.org/dc-motor-control-pwm-555.html
    http://www.apdigitallight.com/2010/08/diy-laser-spirograph-part-2.html

    If your circuit is running from 6V and you use a MOSFET as the switching device you should make sure it's a "logic-level gate" or "Low VGS" MOSFET. An excellent choice is the NTD4906 from ON Semiconductor which is available from Digi-Key: http://www.digikey.com/product-detail/en/NTD4906N-35G/NTD4906N-35GOS-ND/2194521
     
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