A review of book available from Amazon.com, titled, 'How to Make
Home Electricity from Wind, Water, Sunshine', by John A. Kuecken,
"[the author] goes as far as to say almost any motor can be used
as a generator..."
Here's a post in a Yahoo Group on Home Energy Systems Discussion
in which the writer talks of having used a ceiling fan motor as
A regular room fan motor would function similarly, but require
higher rpms to produce electricity. A typical house fan is
powered by a four pole AC induction motor. Here's a page from
the Hyperphysics website at Georgia State University that shows
the workings of an AC induction motor:
A useful discussion on the Control.com forum clarifies many
things about the various types of motors which can be used
to generate a voltage:
"...I thought of AC induction motors. These can be controlled
with an inverter but I'm not sure whether they will operate
as a generator when at high speeds. I have seen induction
motors used as generators buty they need to be run at their
rated speed ie. 3000rpm for 50Hz because when you move away
from this speed the motor stops generating."
"I have found this company:
They make brushless DC motors of 6KW or 12KW ratings (and
might even be scalable beyond that). They look very attractive.
Await to hear back for a price. They have speeds of up to
6800rpm and voltages as high as 72v."
"you can use a DC motor as a generator. The simplest is a
standard brushed DC motor as it produces DC voltage that
can be used to charge batteries or power circuits with very
little electronics needed. Other motors such as brushless
DC motors or AC induction motors can also be used as
generators, but they will produce an AC output which will
need converting to DC before it can be used to charge batteries.
Your DC motor will have two terminals, lets call them A and B.
Say you connect +ve to A and -ve to B and the motor turns
clockwise, then when you use the motor as a generator; when
you turn the motor clockwise A will be the +ve output. Simple.
The voltage at the output terminals is proportional to the
speed of rotation."
More on the page:
And here's a useful post on the Scoraig Wind Electric site:
"The best I've found for use as low-RPM generators are the
permanent-magnet "servo" motors such as those sold by Surplus
Sales in Lincoln, NE. For about $30 they will sell you a
permanent-magnet motor that will put out about 5-10 amps at
battery-charging voltage, at an RPM consistent with direct
Much more on the page:
Additional information may be found from an exploration of
the links resulting from the Google searches outlined below.
Searches done, via Google:
"almost * motor * as a generator
"motor as a generator"