Thane Heins Perepiteia Replications

[CRANKYpants]

Animations:
So in this one, voltage is climbing on approach
http://www.koehler.me.uk/animation/e_and_m_magnets.htm

But:
In this one voltage is highest when magnets are out of alignment
http://www.koehler.me.uk/animation/e_and_m_ac_gen_1.htm

hmmm

THESE ARE GREAT!

NOW INSTEAD OF USING A VOLTMETER ON NO LOAD - SHORT OUT THE COIL (INFINITE LOAD) OR PUT IT ACROSS A 1 OHM LOAD (A PURELY RESISTIVE LOAD WHERE THE PF = 1).

WHAT HAPPENS TO THE VOLTAGE?
(BTW MAKE SURE THE COIL IMPEDANCE IS HIGH ENOUGH TO NOT ALLOW CURRENT TO FLOW)

HINT:
1)
THE VOLTAGE AND CURRENT ARE IN PHASE (PF = 1)
CURRENT CAN'T FLOW (IMPEDANCE TOO HIGH) SO THE VOLTAGE BUILDS.

2)
AS LONG AS THE MAGNET IS APPROACHING THE COIL OR RECEDING AWAY (MOVING AT THE REQUIRED FREQUENCY IN OTHER WORDS) CURRENT WILL NEVER FLOW BECAUSE THE FREQUENCY DEPENDANT COIL IMPEDANCE WON'T ALLOW IT. IF THE CURRENT CAN'T FLOW THE POTENTIAL DIFFERENCE (VOLTAGE) ACROSS THE COIL WILL ONLY GROW AND GROW AND GROW.

3)
ONLY WHEN:

THE MAGNET IS NEITHER APPROACHING NOR RECEDING FROM THE COIL - TDC - CAN CURRENT FLOW - AND AT THIS POINT VOLTAGE IS MAXIMUM.

FORTUNATELY YOU WON'T FIND THIS IN ANY TEXT BOOK OR EDUCATIONAL WEBSITE - SO YOU WILL HAVE TO USE YOUR OWN NOODLE.

T

[hoptoad]

FORTUNATELY YOU WON'T FIND THIS IN ANY TEXT BOOK OR EDUCATIONAL WEBSITE - SO YOU WILL HAVE TO USE YOUR OWN NOODLE.
T

Fortunately !!
Cheers

[Nali2001]

Animations:
So in this one, voltage is climbing on approach
http://www.koehler.me.uk/animation/e_and_m_magnets.htm

But:
In this one voltage is highest when magnets are out of alignment
http://www.koehler.me.uk/animation/e_and_m_ac_gen_1.htm

hmmm

One other things is, that is seems to be 'a shame' that the maximum rate of flux change does not go hand in hand with maximum field strength. The stronger the field gets, the less the rate of flux change becomes. So that high field strength moment is not really used.

If one could make a generator where the 'maximum field strength' also meant the 'moment of maximum flux field change' then that generator would be considerably more powerful. Not o.u, but still more watts out of the same package.

[i_ron]

Apart form theorizing let's talk about experimenting.

I mounted the previous days two coils IN PHASE (specs see previous posts) wound with 29AWG @ 30 ohms.

I spinned the machine some 1100 rpm. Each one achived some 55 volts and had an 0,270 Amps oscillating current. Neither manifested accelaration at this speed.

Then i series connected them. Nor then i achieved any accelaration.
Even though my experiment is totally inconclusive, i think connecting 2x35 ohms same phase HV coils cannot give the accalaration effect of a single 70ohm one.

Additional findings: Voltage effectively doubled (some 110vAC) whereas current remained the very same (normally).

An interesting note is that the cogging torque of two coils simultaneous in phase is very high . Even shorted does not vanished as the odd-even (magnet-coil) configuration does.


Regards,
Baroutologos

Good work, T was using coils anywhere up to 150 ohms? My small coil is 63 ohms, big coil is 120 ohms.

In series did you get 110 volts?

You clearly presentated the lathe picture and the sine wave that a single polarity magnet made. That's my experience also, BUT. Can you confirm on the scope that zero voltage coincides with magnet TDC?

Not too likely is it?  anyone who has built an Adam's pulse motor will know that the initial setting of the opto to where it "looks right" is in for a big surprise at how far you have to move it to get it to run right. All I was insisting on was that the coil/magnet is generating a positive and a negative sine and any theory should acknowledge this fact.

Ron

[i_ron]

If one could make a generator where the 'maximum field strength' also meant the 'moment of maximum flux field change' then that generator would be considerably more powerful. Not o.u, but still more watts out of the same package.

Yep Steven, that would be nice.

Anyway, in all the time I have investigating the Mr T stuff I had never thought to scope the coils! So thanks for the little nudge with the "M" wave question.

First, for a base line, here is what a properly designed rotor looks like on the scope. This is based on the work of Phil Woods, the well know Aussie inventor. Notice the very nice si ne wave, a bit of a peak but that would go away with a load.

Ron