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  1. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Iop995, I guess my question then regards what current to use for comparing peak voltage of motor to the peak current rating of the controller (which is listed as Arms) ? Seems like it would be Ibmax(Adc)/sqrt(2) to get peak current of motor in Arms.
  2. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Do you mean ask someone from Kollmorgen about the ones in the link you posted?
  3. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Hi Iop995... Thanks for posting that... We hadn't seen those, Though we did take a pretty close look at a this mechanical CVT:Link There were several concerns with it, namely input speed and torque, the fact that we needed a very compact and stout solution, and the notion that we would be...
  4. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    You know... I looked at those direct drive motors very early on. They are very cool. But most max out at about 500rpm (some 800rpm). We'd either need excessively large drive wheels, or have to gear them UP 3:1 or more which I think would defeat the purpose.
  5. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Echener, I do not want to hog the replies to your posts; I hope others pop in with comments also! Hog Away... i will unabashedly gleam information from anyone who offers it. And please, don't feel compelled to reply just for my sake. I appreciate all the help you've already offered. I suggest...
  6. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Good points... and I will definitely look at them, but first was trying to make sure my calculations were mostly correct. Its a bit frustrating however with those Mavilors, because since they don't have any sizing software or publish the torque curves, you have to send emails requesting...
  7. eckener

    Camera Dolly -What Type of Gearing?

    Hi All... We got such great input on our last question that we thought we'd pose another... We are building a high-speed motorized camera dolly. The motors we are choosing are very fast, and will drive a 200lb load at speeds up to 25mph (or even 60mph). We are looking for ideas on the best...
  8. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Thanks, Mike... I very much appreciate your reply. I'm a bit new to this level of engineering, so I welcome your double check. It does look like all these motors will all do the job. With that said, the criteria I am really trying to juggle and weigh the options on is the gearing. The...
  9. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    ...and the spreadsheethttp://files.engineering.com/getfile.aspx?folder=e8a48973-c1c7-41c8-b6d8-afc8b8038481&file=motor_comparison_spreadsheet.xls
  10. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Hi mikekilroy.... Sorry I was out of commission for a bit... So, regarding these Mavilor motors, I just don't see these motors being as underpowered as you make them out to be, even considering the current limited torque. To be sure, some are not as strong perhaps as the Kollmorgen (ie. the...
  11. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Hmm I dont know how you are calculating it. I do know that I have run it through the exact same calcs as the kollmorgens, that got similar results to your earlier post, and the numbers come in better on every level. I was extremely careful entering the motor data correctly. It does need to...
  12. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    You offered to compare to other motor, which I greatly appreciate and have told where the spec sheet is a couple times as well as uploaded a curve here. You naysay it, but have you even run it through your calculation to see if your criticism is founded?
  13. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Hi mike, I'll keep this real brief as I'm mid-road trip between LA and Seattle! The link to the mavilor product manual is right below where the link to the two page thing you were looking at is. All the data for the 48 volt windings are there on page 17, and other voltages above. The mavilor...
  14. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Guess it wont link to the .pdf page. Anyway, its just the product manual on that first link to Mavilor. All the drives I mentioned do all three modes. We wouldn't be stuck with one, and may use more than one for different uses.
  15. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    sure... I'll take you up on that.... here is a link to the Mavilor catalog pdf... Page 17... FP-0207.8 (48 volt winding, running on 320 volts DC) Attached is a curve... even the next size down.. FP0105.8 is a very strong...
  16. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Mikekilroy... The Elmo Trombone definitely says "Vector control sinusoidal commutation" The Copley Accelnet doesn't actually specify... I was just ass-suminng. I thought the AKD's were also? The sinusoidal makes a difference as to how we're calc-ing everything?
  17. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Also we are not deadset on Kollmorgen AKM42j motors yet. We were all set, but at last minute were shown these Mavilor XtraforsPrime Slotless Stator Motors. There are some drawbacks, but pound for pound, we get half the inertia ratio, 75% more RPM at very slow speeds (at the cost of running...
  18. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Hi Mike Oh man, I did not mean to offend! sorry! No, the kollmorgen guys have been really nice and the motioneering definitely works and really helped me size the motor correctly, and I am VERY glad to see that you worked on that, thank you. I did use it for motor selection, but now we are...
  19. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    Thanks Iop995, thats just got us a few more runs up and down the football field! Actually, this has whole excersise has had such positive impact, that maybe we will cut the capacity of our pack down... thus gaining, a lot of valuable space for electronics, whilst still providing for a sleek...
  20. eckener

    SPFX Camera Dolly - Motor Acceleration Amps

    If this is correct, its weird that Motioneering wouldn't give the watts required by your power supply.

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