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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
    davezawadi (David Stone):

    How about the load inertia Simon?


    I'm afraid I am not in a position to quantify the load inertia at present, however the cylindrical object has an approximate diameter of 150mm and the 20kg load is always concentrated at the lowest place in the cylinder during motion (i.e. the majority of the load comes from loose material within). Hopefully this will give some indication, I imagine the load inertia could be regarded as 'not-inconsiderable' but this will definitely be fleshed out during the design. I would be grateful if you could advise whether this information would favor a stepper or DC servo?


    This is for an industrial application that will certainly require a bespoke automated solution, my apologies if there was any uncertainty about this.


    Our currently favored solution is for a geared DC servo with simple PWM control, with the option of incorporating encoder feedback / positional control if deemed to be necessary.   


    Many thanks for all your input on this matter, it is very much appreciated.



     


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  • 0
    davezawadi (David Stone):

    How about the load inertia Simon?


    I'm afraid I am not in a position to quantify the load inertia at present, however the cylindrical object has an approximate diameter of 150mm and the 20kg load is always concentrated at the lowest place in the cylinder during motion (i.e. the majority of the load comes from loose material within). Hopefully this will give some indication, I imagine the load inertia could be regarded as 'not-inconsiderable' but this will definitely be fleshed out during the design. I would be grateful if you could advise whether this information would favor a stepper or DC servo?


    This is for an industrial application that will certainly require a bespoke automated solution, my apologies if there was any uncertainty about this.


    Our currently favored solution is for a geared DC servo with simple PWM control, with the option of incorporating encoder feedback / positional control if deemed to be necessary.   


    Many thanks for all your input on this matter, it is very much appreciated.



     


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