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Selecting the right motor

Discussion in 'Other Builds' started by rod madsen, Jul 11, 2014.

  1. rod madsen

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    I need to build a linear actuator that can raise a 1 pound mass 24-inches in less than 1 second. This will probably require a pretty big motor and I'm wondering if such a motor can be attached to the usual hardware. Also appreciate some input as to what motor to use and how to drive it at that high speed.

    Thanks, Rod
     
  2. andrew

    andrew Journeyman
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    How about using a pneumatic actuator?
    I think that would be easier.
     
  3. rod madsen

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    Good idea, Andrew, but it has to operate out in the field where there is no compressed air and no ability to carry sufficient compressed air in a tank.
     
  4. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    What does the reverse trip/reset require? As in, does it have to happen in 1 second? If not, spring load the up motion and use the motor to reset the spring on the reset.
     
  5. andrew

    andrew Journeyman
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    Good idea Rick. I think we would need more information about the application to make any real recommendations.
     
  6. rod madsen

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    Return trip has to be nearly as fast, i.e., less than 2 seconds. Physics says that F=ma, so to accelerate 1 pound of mass (.031 slugs) to 3 ft/sec in 0.1 second would only require 15 ounces of force for 0.1 sec. This would translate to less than 6 in-oz of torque on a pulley with a pitch diameter of 0.76". The problem, I guess, would be maintaining 600 rpm for the next 0.9 sec. How fast can a stepper go? What does the torque v. speed curve look like? I don't expect anybody to do my research for me, but maybe you can cite some useful reference material for me.

    Thanks, Rod
     
  7. Tweakie

    Tweakie OpenBuilds Team
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  8. rod madsen

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    Thanks, Tweakie, I think that will be very helpful.

    Rod
     
  9. rod madsen

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    Okay, I think I have determined that a frame size NEMA 23 will do the job. Does the hardware for mounting these exist here?

    thanks, Rod
     

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