GENERATOR- YOU DO THE IN/OUT POWER MATH

[DeepCut]

Hi.

When the coils are connected in series i am getting nearly 50 VDC.

I decided to put the two coils through seperate bridges, both bridges are the same product.

My original coil is outputting ~40 VDC.

The new coil is outputting ~20 VDC.

Why, when they are in series, am i not getting ~60 VDC ?


Gary.

[DeepCut]

I'm wondering ... if the pipe section that the magnet is housed in were to be wound as a toroidal coil, surely that would boost output considerably since all the induction angles are covered, so to speak ?

I have contacted a transformer manufacturer to find someone that can wind around plastic cores, wish me luck ;+}


Gary.

[gyulasun]

Hi Gary,

The multimeters are ok, model UT 50C has frequency measurement feature too (the other two do not have) if you do not have an oscilloscope then it may be useful if you wish to check rotors RPMs, otherwise the UT 50A is appropiate too, there are only small differences (in finer measurement ranges)  between the two models.
(You have to know that such multimeters are calibrated to sinusoidal waveforms, up to max 400Hz AC and cannot measure square waves or pulses correctly.)

My original coil is outputting ~40 VDC.

The new coil is outputting ~20 VDC.

Why, when they are in series, am i not getting ~60 VDC ?

Please read this link on the full wave AC rectification 'secrets' and study the positive half waves that are created after the rectification. 
http://www.electronics-tutorials.ws/diode/diode_6.html
As I mentioned, all the meters (analog or digital) are calibrated to sinusoidal waveforms, and even though you use the DC voltage range, these half wave peaks may trick your meter and render it inaccurate, this is what I can think of your question, maybe there exists other explanation for it. Did you use analog meter for those DC voltage measurements?

From the obove link you can see what is the effect of the puffer capacitor to smooth out the half peaks to pure DC voltage.  But you have to use electrolytic caps with at least 63V DC working voltage. Much better comparisons could be made with purer DC voltages.

I have contacted a transformer manufacturer to find someone that can wind around plastic cores, wish me luck ;+}

Do you think further costs are justified to spend before you fully explore with the present setup its possible efficiency?  For instance use load resistors in the some kiloOhm range where the rotor magnet already cannot stop due to the load and see the input/output power relationship etc.

rgds,  Gyula

[DeepCut]

Thanks very much Gyula, that is all really helpful.

I used my analogue for those measurements.

The transformer chap said he will look into it now i have given him dimensions and such, i am only getting a quote for the moment.


Gary.

[mscoffman]

@deepcut

The reason the two AC coils won't add is that they are driven with
different phases. The coils are called poles of a magnetic device and
magnets create the sinusoidal waveform of the AC in the coils.
The waveform is at the highest instantaneous voltage when a
magnetic poles point along the exact center line of the coil. The coils
alternately see the N/S pole coming towards it. Your two coils are
pointing in different directions therefore the AC voltage waveforms
don't match up to add up. An o'scope would show this, that the two
voltages are out-of-phase. Once you convert these independently to
DC and filter cap. though there should be no problem adding the DC
voltages up.

:S:MarkSCoffman