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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. a4niko

      a4niko Member

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      Dear engineers

      would you please help me about belt driven motor?

      i would like to know what happen for fans in ventilation system ( i mean their efficiency) if we change single revolution pully to dual revolution therefor the motor can work with two speed : low speed and high speed .
      I f we do that what can we do for tightening the belt ?

      Mary
       
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    3. John OBrien

      John OBrien New Member

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      Mary you need a take up for you system I'm sure you can find one with this info. Good luck
       
    4. a4niko

      a4niko Member

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      Dear John OBrien

      I dont understand what you said . would you please tell me what do you suggest for me ?

      Thanks alot
      Azadeh
       
    5. Strambo

      Strambo Member

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      If you change speed by moving the belt to a smaller pulley, the belt will not be tight unless you have a "take-up" of some sort.

      What I think he means is an idler pulley on a spring-loaded lever; it will keep the belt tight. Such a device might be called a "tensioner". Look to the web sites that supply Power Transmission Components.
       
    6. Michael Ross

      Michael Ross Well-Known Member

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      You can put the same two different pulleys on the motor and on the fan. Then when you change they have the same length.

      This is common on simple drill presses where one belt may select different speeds.

      But this is a manual change. You did not say you wanted an automatic means.

      You did not describe the belt type. There are many. Efficiency is terrible with v shaped belts and sheaves, but toothed timing type belts are much better. A timing belt is unsuitable for transferring between different pulleys.
       
    7. Ross' Workshop

      Ross' Workshop New Member

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      How about some kind of transmission, like on a bicycle?
       
    8. a4niko

      a4niko Member

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      Hello engineers

      Thank you for all your answers .
      I should examin your susggestion .Transmission and inverters are expensive .
      There is one vbelt (simple belt without tooth) with 2different size pulley, and i will move the belt manually to change the speed(slow-fast) . the problem is the belt isnt tight and it seems i should use belt tightner(sth to take up on belt) or... i dont know....:(

      Best regards
      Mary
       
      Last edited: May 17, 2013
    9. a4niko

      a4niko Member

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      Dear John OBrien

      I dont understand what you said . would you please tell me what do you suggest for me ?

      Thanks alot
      Mary
       
    10. Michael Ross

      Michael Ross Well-Known Member

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      A "take u"p means some way to control the looseness of the belt - a tensioner.

      This can be as simple as a third pulley on an arm in the middle of one side of the belt - called an "idler." The the rotational axes are horizontal then you can simply hang a weight on the "idler" pulley. If a weight cannot be used then a spring is simple to use.

      Google on "belt drive idler" then look at the images.

      You may wish to consider a flat, grooved belt; they are more efficient. But, v belts are common everywhere and inexpensive.
       
    11. Dana

      Dana Well-Known Member

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      If you have two different size pulleys on one shaft, you will also need two pulleys on the other shaft, otherwise they will be misaligned. In this case you might as well have different sizes so the total belt length is unchanged. If the shafts are far enough apart you might get away with it, then you either need an adjustable idler pulley, or the motor needs to be on a moveable mount to take up the difference. You would need a way to adjust the tension even if there's only one pulley on each shaft.
       

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