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Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
I need two of them, smaller is better than large, and they have to be electric. At least 4,000 rpm, 6,000 would be better. Anyone know where to find them? Would a disk drive from a computer have one that's fast enough?
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
You need to be more specific about your requirements -- size,torque/power, etc. Internet searches can do wonders. The following can all run at 4,000 rpm. This line comes up to 9,000,000 watt output power.
[edit] This might actually serve your purpose. A 4-mm-diameter pager motor for US $4.25, similar to the tail rotor motors in micro RC helicopters.
Wandering off topic, which is where to get motors, this one has a volume of less than 1 cubic mm. But its world-record claim is bogus. I've seen a motor in 1/16 of a cubic mm, of conventional iron & magnet wire, made in 1960. (don't know if it can do 4000 rpm, but bet it can).
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Fraggle wrote ...
Hard drive motor are lightweight and 7200rpm (!) aren`t they. You have to make a circuit to drive them or use the electronics from the drive.
I've found it easy to spin up a hard drive motor by figuring out where to apply 12V and an enable signal to the motor-control-board connector. Wish I had thought to measure the voltage on all connector pins with the HDD running normally, before taking it apart.
You can also use an electronic speed control for "brushless DC" motors, available at hobby stores.
[edit] For your spinning copper cylinders, consider AC or DC motors from discarded electric tools (including e.g. blenders and vacuum cleaners), either corded or cordless.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
If you can't get the speed you want, you could simply use larger diameter cylinders - its surface speed, not rpm, that matters. You can use aluminium too, but it needs to be thicker than copper for the same effect.
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sourcing 4000+ rpm motor's
