Posted by harry on July 28, 2009, 7:12 pm
Induction motors can be used to generate but only in whilst connected
to another AC electricity supply.
Basically you have to run it it up as a motor when it will achieve a
speed a little below synchronous speed.
Then, you have to bring in your power source & make it run faster. As
it comes up to synchronous speed, the current drawn will fall to
zero. When you drive it faster than synchronous speed, it will start
to generate and put electrical power out. So, to use this power, your
electric fire (say) will be connected in parallel with the induction
motor/generater (proper name ASYNCHRONOUS GENEATOR) and the power
The speed has to be regulated so that it is not overloaded, it will
generate the same power as it consumes as a motor.
But it has to remain in parallel with the external AC power supply at
Bit here on the subject.
Posted by clare on July 29, 2009, 12:44 am
On Tue, 28 Jul 2009 12:12:29 -0700 (PDT), harry
An induction motor works well as a generator with the proper
caspacitors connected. 3 phase works best and they are always
available cheap used. They need to turn just over nameplate rpm and
need to be spun up with no load. They are impossible to overload -
they shut themselves down when overloaded
Posted by Ulysses on July 29, 2009, 2:26 pm
According to Mr. Unknown in Alternator Secrets you also need to flash it
with 12 volts (or thereabouts) to get it to start generating. At least on
some motors. So for a wind generator I assume you would need to find one
that doesn't need to be flashed, or at least will hold some residual
magnetism for a while. I have not tried this washing machine motor trick
yet but I guess I'll have to just so I'll know... Let's see: 1/3 HP%0
watts (roughly) so it looks like the hard part would be finding a small
enough engine if somone wanted to make a gasoline-powered generator.
Posted by clare on July 30, 2009, 3:15 am
On Wed, 29 Jul 2009 07:26:07 -0700, "Ulysses"
You may need to do that ONCE on a motor that's been sitting unused for
a long time. As soon as it has been used as a motor or generator a
residual feild is established in the motor which will remain as long
as it is used on a semi-regulat basis.
Posted by Ulysses on July 30, 2009, 2:59 pm
OK, so just like any other generator then. Thanks.