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Im in need of a motor

Discussion in 'Sensors and Actuators' started by simong93, Jul 16, 2013.

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  1. simong93

    simong93

    28
    0
    Dec 20, 2011
    Hi all im back again to ask the impossible.

    I am after a motor that will pull all these gears and with some speed i might add im hoping not to go higher then a 12v dc motor i have been looking at this one http://www.ebay.co.uk/itm/3000-6000...al_Components_Supplies_ET&hash=item2c6ec276ba

    with this controlling the speed http://www.ebay.co.uk/itm/New-10A-D...ial_Automation_Control_ET&hash=item5657c297ff

    now the maths motorgear/gearlittleteath= turns per minute* motor rpm= total so this would be 56/32=1.75*2000= 3500rpm.

    So that means this motor should turn at 3500rpm under load. My last question to you guys is im going to have the metal poles spinning so i need some bearings im thinking ball bearing would work what do you guys think.



    [​IMG]
     
  2. duke37

    duke37

    5,364
    771
    Jan 9, 2011
    If the motor is running at 3500 rpm then the two driven shafts will be running at 6125 rpm.

    Plain bearings can manage this speed but need to be made very accurately. Ball bearings would be good if there is no significant side load.

    If you are spinning metal poles at such speeds, I suggest body armour and a crash helmet would be advisable.
     
  3. simong93

    simong93

    28
    0
    Dec 20, 2011
    That has made my day :). I can see safety being a major issue here being the reason i added the speed controller. Maybe i should encase it in perspects eventually i would want to build a motor on each of the gears getting rid of the poles. Also would magnetic bearing be better in this case then and how could i make this safer.

    Also the motor will be spinning at 2000rpm the drive shafts will be spinning at 3500rpm not to sure where the 6125 come from :?
     
  4. eKretz

    eKretz

    251
    27
    Apr 8, 2013
    Well the original post wasn't the most coherent thing in the world, so I can understand Duke's confusion. In your first post you said "So that means this motor should turn at 3500rpm under load." But in your second, "Also the motor will be spinning at 2000rpm the drive shafts will be spinning at 3500rpm not to sure where the 6125 come from."
     
  5. duke37

    duke37

    5,364
    771
    Jan 9, 2011
    You said the motor would be turning at 3500 rpm.
    3500 * 1.75 = 6125.

    Use ball bearings, small ones can run at 100,000 rpm
    The shafts must be dynamically balanced for safety.
     
  6. simong93

    simong93

    28
    0
    Dec 20, 2011
    I can see the confusion here sorry about that basically the big gears of 100T should be spinning at 3500RPM.

    But anyways we are off topic :D Would that motor be ok for what im after.
     
  7. duke37

    duke37

    5,364
    771
    Jan 9, 2011
    The motor controller should drive the motor you show and should do a much bigger motor. You will need a power supply to provide an input.

    The motor is very diddy and may only be able to drive very small equipment. The aerodynamic drag will be significant at high speeds but I do not know how to calculate this.
     
  8. simong93

    simong93

    28
    0
    Dec 20, 2011
    Cool sounds like it will do what i need it to
     
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