Sharing ideas on how to make a more efficent motor using Flyback (MODERATED)

[tinman]

I think Itsu has measured the C2 peak voltage with 2 scopes and verified C2 capacitance with a DMM.

Maybe the CSR is 0.01Ω and not 0.1Ω as expected and we don't know about it, but the input current waveform was also measured by a Hall probe in addition to the CSR and there was not much difference, so Itsu would have to make some systematic measuring mistake here to err.
...like his x10 switch on the probe making a bad contact, or bad probe attenuation setting in the scope ...or other silly thing like that. 
I think I should ask Itsu to do a sanity check and put that scope probe, that measures the voltage from the CSR, across his power supply (or across an AA battery) and see if he gets the same voltage reading as the power supply's voltage (or AA battery).

Anyway, as soon as Itsu makes his "C2 discharger", the C2 voltage waveform will become rectangular with high duty cycle and a regular averaging voltmeter will be able to measure its peak voltage (minus the duty cycle error), so we will have another instrument confirming or denying these measurements.

I was thinking about putting a light bulb in place of R2 because 49.005mJ being recovered 40 times per second, equals 1.96J per second and that is the same as 1.96W of average power.   So a small 2W incandescent light bulb could be lit. 

Who wants to calculate the ideal voltage rating of such small bulb ?

6 volts.
Current close to 1/2 that of the input
Resistance close to 3x the voltage.


Brad

P.S--warning,light bulbs create confusion lol.

[itsu]

Ok,  found the error, the C2 capacitor is 1uF,  not 10uF as i mentioned before, i mixed up with some 10uF caps i also had on order but not yet received     Sorry about that.

It measures 1002.4nF when i rechecked and screwed up on the decimal point.

Itsu

[tinman]

Ok,  found the error, the C2 capacitor is 1uF,  not 10uF as i mentioned before, i mixed up with some 10uF caps i also had on order but not yet received     Sorry about that.

It measures 1002.4nF when i rechecked and screwed up on the decimal point.

Itsu

Mmm
Are you sure on this Itsu,as you have now gone from 276% to 27.6% efficiency,and that sounds very low. But if that is the case,then it is good that you found the error.

But before you give this all away,can you give us the measurements with and without the rotor?

Cheers

Brad.

[itsu]

Hi Brad,

yes i am sure, but i think 27% is more in line with what to expect.

I will shoot a video when running and show the measurements and then stop the rotor with the same measurements taken.

Itsu

[partzman]

From these scopeshots of his, I gather that it is the Tektronix TDS 2024B

Verpies and Gotoluc,

OK.  The low resolution is probably due to the "Fast Trigger" acquisition mode being current selected. To change, under the front panel "Acquire", press the "Menu" button. This will bring up a bottom screen menu that has the current acquisition mode indicated in the 2nd from left position. The choices are in the right hand vertical screen menu so select the "Normal" (10k point) which will give you the highest horizontal resolution.

To get the Math functions working with vertical cursors, you can refer to the instructions I gave Itsu but in general, you must have "Cursor Gating" selected in the Measure menu and "VBar" selected in the Quickmenu to activate the vertical cursors. From there you should be able make any selective measurement on screen between the cursors.

partzman