motor --> generator

[Karl W4KRL]

Alex,

The permanent magnet motor should work equally well as a generator. The no-load output voltage will be nearly directly proprtional to the shaft speed. If you feed it with 15 volts you will have a pretty good idea of the speed you will have to turn it to generate 12V.

Good find!

73 W4KRL Karl

- Sent from my Verizon Palm Pre
On Jul 21, 2011 8:12 PM, Alex Fraser <beatnic at comcast.net> wrote: 


I got a free cheapo electric scooter.  It
had a  300 watt (a guess)  motor on it.  I took it apart and it
is a permanent magnet commutator motor.  I'm not sure of the winding
set up.  I spun it with 12 volts and it ran, but I think the scooter
was 24 volt.  THE question is could I reasonable expect this motor to
act as a 24 volt generator if I spun it fast enough? When I spun it at
low speed with an electric drill it made 5 volts into no load.  When I
looked at the motor it seemed to beg to be hooked up to a weed eater
motor.

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