View Single Post
Old 05-23-2019, 11:06 AM
BroMikey's Avatar
BroMikey BroMikey is offline
Platinum Member
Join Date: Jan 2013
Posts: 6,133
All true I should have been more clear on these other types of motors
and generators with open cages. There are many many motor types
and generators and so i was only generalizing about motors like
a washing machine motor.

Some are designed with a closed cage like the scooter motors and one
motor I have is water tight for boat trolling. You are right 100 watts is
a bad example.

I am thinking how generators are made for backup power and they are
made to continuously expel heat. A motor designed to run 30 amps with a
closed cage operating at under half capacity of course will never get hot.

I thought you were running all north poles? And it gets hot, right? So
running N S N S is the same as the all north in this case, depending.

Generally, motors that run an air compressor or an electric lawnmower
or even an egg beater have cooling fins. Treadmill motors that i have
are PMM but 2 poles have fans. Golf cart motors run on DC and they
have ports and fins.

To me motors are generators. I can generator electricity with any motor
you own or can think of. All you do is take any motor you want to
convert to a generator, take the 2 wires that you normally connect
to the wall sock (induction type for instance) put 12vdc across them
for 5 seconds doing that 10 to 20 times.

Now your motor has enough residual magnetism stored in the core
material to start the generating process. Now connect a 50uf oil filled
cap across the same terminals, turn the shaft at 1800 rpm's which is
50 rpm's faster than the 1750 rpm that it is rated for and you will
be generating. The output is 90%, I built one here years ago. I used
a 2 1/2hp Briggs to turn it at a slow crawl. I use it out back to power
a saw all and drills.

I should have pointed out that all of the motors I have all have cooling
ports, fins and fans built into them on the inside. This i know because
I take them apart all of the time to replace bearings or brushes.

What I like to do is to use a bigger motor to power things so the heat
never becomes an issue. The alternator on your car generates power
and has a fan on the from of it.

Now here is what I can't figure out so maybe you can help me out. On
your big machine (Like John B. used to say) you have 1.5 amps coming
out of a 23awg wire conductor rated for 4.7amps, right? Why is it getting
hot then? Could it be that the wire is to small?

Could it be that the ratings for magnet wire are listed for a low frequency?

If this is true Not saying it is 20awg would handle it.

Look at this chart on magnet wire and tell me how frequency changes
the amp ratings. Or if it is considered power transmission. I know
it does not fall into the chassis rating.

if a coil or solenoid is considered a power transmission device then a
23awg wire is only rated for .7amps at say 60hz.

Can you understand my question? Why the heat.

Also i have a Bedini 5 strand with 4 of the conductors @14awwg and
the rating says 30 amps but when I use it in a coil it warms up at
5 amps? See my point? Why is that?

What is the frequency of your big rig? that would tell me something.

Last edited by BroMikey; 05-23-2019 at 11:25 AM.
Reply With Quote