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Permanent Magnet Motors
The following chart was produced by TLG Wind Power Products. Their website can be found here. I'm sure you'll find this information as useful as I have, referring to it often. Thanks TLG Wind Power!
UPDATE: TLG Wind Power now manufactures a replacement PM Motor replacement for the Ametek 99 - see it here
AMETEK PM MOTORS
Since everyone keeps asking questions about the Ametek PM Motors I thought it was time to see what I could find. I searched the web and I have found the following data on the different Ametek motors. I've learned some things along the way as well, like Ametek made several different versions of the 40 and 50 volt motor (maybe more). All I know about these motors to date is here.
One thing I have found to be true, the best PM motor for use as a generator is the one that has the highest rated voltage at the lowest rpm. Meaning that if you have a PM motor that took 120 volts DC in and only turned the shaft at 300 rpm, you would know that it would put out some serious voltage as a generator. Windings make a difference in the amount of amperage they can produce. If you had a motor with windings the size of hair your output will be very low in amperage because the fine wire cannot carry the amperage.
I was not able to find exact Ametek part numbers but it seem that you can tell which one it is by the size of the motor and the difference in the shafts. All the motor have the Nominal voltage printed on them. Measure your motor and compare your measurements to this chart to know which Ametek motor you have. I did not take the reading, I simply found the data to share.
Some pictures of the Ametek motors below.
Click on the images above to view larger pictures.
If you can't find a low RPM permanent magnet motor and don't want to make your own axial flux alternator, here's a video of one way to gear-up a motor:
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