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Choice of motor - application query

simonturner83
Hi

I am currently working on a design concept for a motion system - I would be very grateful for any advice that could be given on a suitable type of motor for the application (e.g. servo, stepper, DC motor etc.).
 The related requirements for the motion system are as follows:
  1. Rotate a cylindrical object placed on its side on friction rollers to allow inspection, where rotation occurs around the axial axis as per test tube rollers or pipe weld rollers.
    1. Details of the cylindrical object:
      1. It is unattached to the rollers, i.e. placed on for rotation / inspection then removed.

    2. Can weigh up to 20kg.



  • The cylindrical object is required to rotate at a very slow speed, typically 1rpm and lower, where the upper limit is likely to be in the region of 15rpm. The friction rollers on the motion system will be in the region of 1/10 to 1/20 of the circumference of the cylindrical object.

  • The rotation of the cylindrical object is required to be significantly consistent, i.e. smooth rotation with minimal stepping / juddering.

  • The motion  profile is likely to just be one full rotation of the cylindrical object at a fixed speed, but there may be a requirement to perform the rotation in increments with pauses in between (i.e. one full rotation split into 6x moves). The duty will be low, i.e. 5-10 such operations per day.

  • Allow some basic position/speed control, where closed-loop is preferable.

Many thanks.



Parents
  • 0
    well if we assumed a 6 inch diameter tube of thin wall thickness and half load, that puts an upper limit on the inertia, (essentially integrate ove a uniform semi-circular weight) but adds a dissipative aspect from energy lost as the liquid or granular material within is agitated - this works in your favour.

    The only remaining question is the one about overshoot - if we ask for a dead stop from full speed, how accurate do we need it to be, and is it OK if it rolls back a bit - which it will always of course, but if we can accept +/-1 degree it is easier spec than 0.1 degree, in turn easier than 0.01 degree or 0.0001 -  if we were reading a 300 DPI printed label for example you might accept 1/300 of an inch of movement  within that ~ 18inches of circumference , so one part in  ~6000 of 360 degrees, so 0.06 deg.   I suspect however something quite a bit looser will be fine.

    With a bound for that that we have all the info  we need.

    M.
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  • 0
    well if we assumed a 6 inch diameter tube of thin wall thickness and half load, that puts an upper limit on the inertia, (essentially integrate ove a uniform semi-circular weight) but adds a dissipative aspect from energy lost as the liquid or granular material within is agitated - this works in your favour.

    The only remaining question is the one about overshoot - if we ask for a dead stop from full speed, how accurate do we need it to be, and is it OK if it rolls back a bit - which it will always of course, but if we can accept +/-1 degree it is easier spec than 0.1 degree, in turn easier than 0.01 degree or 0.0001 -  if we were reading a 300 DPI printed label for example you might accept 1/300 of an inch of movement  within that ~ 18inches of circumference , so one part in  ~6000 of 360 degrees, so 0.06 deg.   I suspect however something quite a bit looser will be fine.

    With a bound for that that we have all the info  we need.

    M.
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