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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.



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  • 0
    That one is far too big! A printer paper feed one geared down might be suitable. Remember you need the torque at 1 RPM and the motor will happily do several hundred, so you have several hundred times the motor torque available. Toothed belts are ideal for this kind of application. 50nM is quite a lot, MCBs 2.5 nM, direct from the motor shaft without gearing!  You wouldn't want to hang on to that motor shaft! Whilst a hand driven idea sounds OK, I am sure this actually wants a motor system for some reason, perhaps the whole lot is inside a nuclear plant away from the operator. It could be a training exercise. Many reasons for the question.
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  • 0
    That one is far too big! A printer paper feed one geared down might be suitable. Remember you need the torque at 1 RPM and the motor will happily do several hundred, so you have several hundred times the motor torque available. Toothed belts are ideal for this kind of application. 50nM is quite a lot, MCBs 2.5 nM, direct from the motor shaft without gearing!  You wouldn't want to hang on to that motor shaft! Whilst a hand driven idea sounds OK, I am sure this actually wants a motor system for some reason, perhaps the whole lot is inside a nuclear plant away from the operator. It could be a training exercise. Many reasons for the question.
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