Motorized Rotating Platform

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Old 02-13-14, 08:54 AM
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Exclamation Motorized Rotating Platform

Hey guys my name is oscar and I'm a research assistant for a PhD student. I've been here many times for different problems. So this is my first time actually posting one . I'm currently working on my final project and I need to build a motorized rotating platform. It's for a process called electrospinning. Anyways I have no idea how to start building this platform.
I need the platform to be made out of metal, hopefully one that is a good conductor because I need to hook the platform up to some high voltage.
Apparently the process requires me to ground the metal plate.
Also I need the platform to rotate, maybe with the aid of a dc motor. I also need to be able to control the speed of the motor to a speed of 150 rpm or more.
I had several ideas of how to do this, one of them was to drill a hole through the metal sheet and just stick it on the axle of the motor but if I do that the platform won't be stable.
I currently have an industrial dc motor but I think it's too big for this process. So I would like to know what kind of motor to get and how would I be able to regulate the speed??
Also I would like to know the best possible way to mount the metal disc onto the ale of the motor.
I seriously need help with this as the deadline for my project keeps approaching.
Thanks
 

Last edited by Engine guy; 02-13-14 at 10:28 AM.
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Old 02-13-14, 09:14 AM
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How big is the platform supposed to be? Is it supposed to be the size of a Lazy Susan or the size of a stage?
 
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Old 02-13-14, 09:24 AM
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I guess it should be about the size of a lazy susan
 
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Old 02-13-14, 10:01 AM
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BALDOR Cooling Tower Direct Drive Motor and Variable Speed Drive

Something like that might work. Search google images for "variable speed drive motors" for other ideas.
 
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Old 02-13-14, 10:16 AM
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Do you think this engine will work ???
 
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Old 02-13-14, 06:54 PM
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That is a 240/480V AC motor. If you look at the nameplate the RPMs are too high for what you need. Varying the speed of AC motors can be very costly and should only be done using the right equipment (See FVD) DC motors on the other hand are much easier to control the speed.
 
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Old 02-14-14, 07:53 AM
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I am thinking you need some type of gear motor, possibly something like this.

NIDEC MOTORS & ACTUATORS – Geared DC Motors - Worm Gear
 
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Old 02-14-14, 08:11 AM
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You will definitely need some type of gear driven system like Joe mentioned.
Do you have a budget or a spending limit as that will be a guiding factor too.
 
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Old 02-18-14, 06:16 AM
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Yh I do. It's the amount of money I have in my account
 
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Old 02-18-14, 08:01 AM
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Cheap Fix

Power the platform off of a used treadmill. Treadmills have speed adjustments and you should be able to find a used one cheap.
 
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Old 02-18-14, 08:07 AM
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Well that was helpful. Since I assume your account is limitless than I suggest buying a variable frequency controller for your motor. If your account is more modest just chuck a sanding disk holder in a drill and glue on a metal disk.
 
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