nuckollsr(at)cox.net
Guest
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 Posted: Tue Sep 05, 2006 4:30 am Post subject: Turning a Brushless Motor into an Alternator (OOPS) |
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At 07:06 AM 9/5/2006 -0500, you wrote:
| Quote: |
<nuckollsr(at)cox.net>
At 11:47 AM 9/4/2006 -0400, you wrote:
>
><livingjw(at)earthlink.net>
>
>Bob, All,
>
> I have a project coming up that needs a small, high speed (~10K RPM or
>higher), light (as practically possible) alternator which will produce about
>.5KW at 30-50 volts. I was thinking of converting one of the numerous
>permanent spinning magnet brushless motors that are available for RC
>aircraft. My thought was to introduce appropriate diodes and turn it into a
>brushless alternator. Would this be a reasonably straight forward project or
>is it just a crazy idea?
Works for me. The motor has some characteristics called
torque, voltage and velocity constants (Kt, Ke, Kv respectively).
Your motor of choice needs to have a Kv on the order of 40v/10,000
or 40 mV per RPM. 500 watts at 40 volts is about 12.5 amps, so the
motor you choose will need to be capable of running continuously
at loads producing 12.5 amps of current flow.
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Correction. 4 mV per RPM not 40.
| Quote: | If you have a motor in mind that falls in this range, then
it's a candidate for the task. Now, voltage regulation is
another issue.
Bob . . .
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