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  • help about dual revolution belt driven motor

    Discussion in 'The main mechanical design forum' started by a4niko, May 13, 2013.

    1. nefthymiou

      nefthymiou Member

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      Variable diameter Pulleys

      Hallo Mary (a4niko)
      I do not know the REAL working contditions and the problem you have . I suppose you want to regulate the air suction.
      I would sugest you a "clever " solution .
      1.Let the Ventiator run run with one pair of Pulleys.
      2.Put an "T" piece in the Suctio side ,with a Damper at the free part of "T" (3rd not connected to the pipe network)
      3. Open or close the Damper to adjust the flow as you wish....
      Damper ajustment can be also be automated -later.

      If this isn not OK , then you could have a 2-speed Motor (if you want to avoid inverters ..and so on... )

      I hoppe i hav helped you

      Nikos
       
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    3. G-manIII

      G-manIII New Member

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      Belt tension

      This is a very easy way of keeping the tension on your belt as long as you have a mounting plate? 1-You want to use a small pulley, preferrably one with sealed bearings.
      2-You will need to use a "c" or "u" bracket that attaches to pulley
      3- spring with tension bolt. Or you could send me a picture of what you have and I could help you out?
       
    4. Ross' Workshop

      Ross' Workshop New Member

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      You could take the actual chain and transmission from a bike and attach it. Or you could just change the speed of the motor.
       
    5. nefthymiou

      nefthymiou Member

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      Variable diameter Pulleys - 2


      Variable diameter Pulleys - 2

      Hello Engineers
      I think we do not have understood the Project.
      Suppose you have 2 Double Diameter Pulleys

      First D1=50/D1a=100 mm , and
      Second D2=100 /D2a=50 mm

      Combination A
      Driving Pulley D1=50 mm
      Driven Pulley D2=100 mm
      Distance o Axes A = x
      Motor Speed = 1200 rpm (e.g.)
      Ventilator speed = 600 rpm

      Combination B
      Now we change
      Driving Pulley D1a=100 mm
      Driven Pulley D2a=50 mmm
      Distance o Axes A = x (We do not need Belt Tension ...!)

      Motor Speed 1200 rpm
      Ventilator speed = 2400 rpm



      A real problem is the Efficiency o Ventilator , Staic pressure , and Flow( CFM) at 600 or 2400 rpm .

      Here we need the Ventilator Characteristic Curves from Constructr's Manual....

      A calculation can be done for getting the Second - or First –Diameter combination alternatives so that the Distance of Axes remains constant = X



      Mary(a4niko) asked something not to specific..So She is getting not Specific answers...



      The Engineers are giving Answers and Solutions, and this is encouraging...


      Nikos
       
    6. jupe

      jupe New Member

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      To change from single to dual revolution using belt & pully you need just two pair pullys (one pair on the motor and one pair on fan). by choosing the appropriate diameter, you can change the speed by moving the belt from one pair to another pair of theese pullys without changging the speed of motor.
      to evaluate the efficiency of fan you can verify using the graph of fan performance

      Jupe
       
    7. a4niko

      a4niko Member

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      Dear Engineers

      Thanks alot, i am so happy to see your answers
      My profession is industrial engineering and beacause of this i cant explain well, and i need to consult with my friend about your suggestion, You give me Good suggestion but Let me explain much :

      I know with calculating numbers for the size of pulley we wont need belt tensioner. but the problem is after calculating we face with high weight pulley so it needs more powerfull motor and it isnt possible to use a powerfull motor then the only solution that we thaught is belt tensioner but belt tensioner will not work well we are working on it ....
      i will back with more detail

      Best regards
      Mary


       
    8. a4niko

      a4niko Member

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      Thank you Nikos for your detail explaination
       
    9. jupe

      jupe New Member

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      belt driven motor

      As I understand your problem is the weight of the pully.
      I'm not sure if the weight is the real problem. I think the problem is because you drive the fan (by chnagging the speed) over the limit of power of the motor.
      You need to check the characteristic of fan you have (relation between speed and power) so you can design or regulate the speed within these limit.

      Jupe
       
    10. a4niko

      a4niko Member

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      Hi Jupe

      No its not under the limit i mean if there is something to just regulate the belt(tension) the problem will be solved.
      Any way Thank a lot for your reply

      Mary
       
    11. jupe

      jupe New Member

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      No, i mean not to regulate the tension of the belt but to choose the rotation or speed of the fan.
      Because as you know the power needed to drive fan it is depend on the design of the blade and the rotation/speed.
      more speed more power needed.
      so it is need to check whether the power needed is over the power of the motor.

      Jupe
       

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