View Single Post BroMikey Platinum Member Join Date: Jan 2013 Posts: 5,884
Hello Experimenters

I have updated the diagram. In this installment I am running
basic math for reference in the future.

First the diagram look at the left side point A and B The points A and B represent the distance that the rotor
will travel in 1 mSec @ 1800RPM here is how to reach that
value.

First we need the circumference at the center of the magnets
measured in INCHES. Since the diameter at the center of the
magnets is 9.6" we use PIE (3.14) X 9.6" = 30" Approx.

So using 30" around the circle for 1 rotation, at 1800 rotations
or 1800 RPM'S is 30" X 1800 = 54,000 inches of travel in 1 minute.

1 Minute = 60 sec so we can divide 54,000" by 60 sec and this
gives us the number of inches the rotor travels per second

OR
54,000 / 60 = 900" per second. So what about milliseconds?
Well 1 second = 1000 milliseconds and if we want
to figure out how far the rotor can travel in 1 mSec we divide
again.

Remember it was 900" per second? So divide 900 by 1000mSec
and this equals .9" @ one speed of 1800 revolutions per minute.

AT 1800RPM"S the 11" rotor will travel .9" in 1 mSec from point
A to point B at the left. If our core area that faces the
round rotor magnets is about 3/4" square as it travels from
point A to B this is about the time that it takes for one magnet
to loose it's influence on the core while the next magnet is
coming into full force.

This is about 1 mSec between magnetic poles @ 1800 RPM'S is
this case.

We don't want adjacent magnets fighting over the core
material, we want them working together.

If we use a 1.5" core this being to large the magnets will
fight each other for control over the core material and cause
heat. If the core area selected is 1/4" there will be a dead
zone of non active force that would depend more on momentum
as one magnet looses it's influence, waiting for another force to
pick it up.

It maybe a good lesson for experimenters to use 2 round magnets
of North and South as planned for a motor/generator and pass
various thickness core material over the area to understand
this exercise. Use different spacing and core thickness to
achieve an optimized geometry for your design.

Backyard experimenting without calculation will result in
complete and total failure, leaving 10 such builders wondering
why each person had a different result. __________________

Last edited by BroMikey; 02-02-2016 at 11:25 AM.