Calculate magnet strength x windings = horse power

Nov 28, 2004 1 Replies
R

Where can I find the figures to calculate a magntic field strength x windings to get a figure for horse power. I want to build a 3 hp permanate magnet electric motor / generator. The idea is to use perhaps 8 or more large NdFeB magnets and at least 4 coils per magnet. In a setup similar to a stepper motor. I can get the magnets for about $30 or $40 each. My problem is I don't have a clue how many I will need if I can't calculate the power I can get from such a design. Can anybody help?



Thanks in advance!



Robert Miller


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C

permanate magnet

NdFeB magnets

I can get

how many

Very difficult. For starters I believe the strength of the magnets has no direct impact on the power of the motor - only on it's efficiency. Of course you have to achieve a minimum efficiency or your motor will melt. The length and diameter of the motor controls it's torque. The number of turns effects the motors speed (RPM/Volt). You need a good book and many hours study - and so would I.

If you want to experiment there is a small community of model aircraft folk who are rewinding CDROM motors for use in model aircraft.

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or this site has kit for bigger motors...

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For parts see the links beginning with "LRK" on the left hand side of the above page (eg "LRK kpl. Statoren" takes you to a page full of stators)

You could also try asking on the Airplanes-Electric discussion forum here..

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Colin

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