High RPM DC Motors

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duoboy Participant Join Date: Mar 2007 Posts: 1	High RPM DC Motors 03/12/2007 12:10 AM
	How would someone design a motor to operate at 48 volts DC and still rotate at 45 thousand RPM's. Wire gauge up to you . Other parameters not listed here also up to you.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: High RPM DC Motors 03/12/2007 6:37 AM
	Another option would be to take a conventional motor and step up its angular velocity using a gearbox. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Anonymous Poster	#2 Re: High RPM DC Motors 03/13/2007 5:45 AM
	Designing it to operate at 45k rpm's is the easy part. Getting it to actually work reliably is the trick. Also, how much power does it have to output? Is the power source mains or battery? Is it ac or dc? What is it turning? Special manufacturing techniques needed to prevent wire from being thrown out, special bearings and the like. Other option, get a 12Vdc motor that has a rated speed of around 12,000rpm and feed it 48Vdc. That should do it. But you may need to toughen it up a bit. Centrifugal force is exponential to rpm. Give some more info re: operational parameters.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#3 In reply to #2 Re: High RPM DC Motors 03/13/2007 5:51 AM
	The statement "Centrifugal force is exponential to rpm." is incorrect. "Centrifugal force is proportional to rpm²" is correct. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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hydman1 Associate Join Date: Dec 2006 Posts: 30	#4 Re: High RPM DC Motors 03/13/2007 8:42 AM
	Trying to balance the rotor is going to be a problem at that speed too. Not to mention the bearing requirements. At that rpm the motor is going to have torque issues too. What are you doing that you need to go twice the speed of a turbo charger?
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garth Guru Join Date: Sep 2006 Location: NSW Australia Posts: 1101 Good Answers: 23	#5 Re: High RPM DC Motors 03/13/2007 9:44 AM
	Use a permanent magnet rotor with electronically switched fields a much more practical solution. Mechanically designed to take the various forces of coarse. Try air bearings as against ballraces __________________ Dont get on to the roundabout if you dont know how to get off
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Anonymous Poster (1); garth (1); hydman1 (1); PWSlack (2)

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