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

[verpies]

I use neo's as magnets and some cut up welding rods in a soft iron sleeve as a core.

Could you show us a hires photos of these welding rods in a soft iron sleeve ?

I will redo these tests, presently i am working on a coil shortener using a reed relay triggered by a hall sensor (+ transistor), hopefully the 15 or so mJ in the cap will not fuse together the reed relay's contacts.

I am afraid it will fuse the relay's contacts

But there is an easy remedy to this.  Connect a choke to the relay's contacts in parallel with a second flyback diode (the diode must be oriented so it does not conduct when the relay's contacts initially close). Put a 100Ω resistor in series with that diode.
This way when the relay's contacts close, the current will raise gradually through the choke and when they open later, the diode and resistor will prevent any arc over. The resistor's function is to prevent the current from lingering in the choke, for too long.

P.S.
Also, you could drive the relay from a 2nd channel of your FG.

[partzman]

I put up a simple test using my SG to provide a 5Vpp 40Hz sine wave signal to a 50 Ohm resistor with a 1 Ohm csr.
I setup the math function Ch1 x Ch2 to show the wattage across the 50 Ohm resistor.

The signals can be seen in the below screenshots, but as can be seen, both screenshots (with or without the cursors) show the same Math mean value.

So either Partzman has an extra feature (advanced analysis) in his scope or our models are behaving differently.
Video here:  https://www.youtube.com/watch?v=tvnUN8u2ILk&feature=youtu.be

Regards Itsu

Itsu,

OK, you must have the cursor gating function "off". From the front panel menu, press "Measure" and then see what the bottom screen menu shows for the gating function (third from the left). It should say "Gating Off". On the right vertical menu select the soft key "Between Vertical Bar Cursors" and this will allow measurements between the cursors. The gating cursor function on the bottom screen menu should now say "Gating Cursors".  This should do it for you- enjoy!

partzman

[itsu]

Could you show us a hires photos of these welding rods in a soft iron sleeve ?
I am afraid it will fuse the relay's contacts

But there is an easy remedy to this.  Connect a choke to the relay's contacts in parallel with a second flyback diode (the diode must be oriented so it does not conduct when the relay's contacts initially close). Put a 100Ω resistor in series with that diode.
This way when the relay's contacts close, the current will raise gradually through the choke and when they open later, the diode and resistor will prevent any arc over. The resistor's function is to prevent the current from lingering in the choke, for too long.

P.S.
Also, you could drive the relay from a 2nd channel of your FG.

Ok,  hires photo below, the use of the slug or sleeve was suggested in an article about the Adam's motor which i was following years ago, see this link which explains why (eddy currents):

https://sites.google.com/site/ageechen/free-energy/adams-motor/hoptoads-articles/page-4


Thanks for the additional info in the reed relais setup, i know i can use my SG for that too, but i want to avoid using the SG for now.

Itsu

[itsu]

Itsu,

OK, you must have the cursor gating function "off". From the front panel menu, press "Measure" and then see what the bottom screen menu shows for the gating function (third from the left). It should say "Gating Off". On the right vertical menu select the soft key "Between Vertical Bar Cursors" and this will allow measurements between the cursors. The gating cursor function on the bottom screen menu should now say "Gating Cursors".  This should do it for you- enjoy!

partzman

Wow,  yes, you are absolutly right, gating was off, so now it does calculate the power inbetween the cursors, many thanks, very usefull.

Itsu

[gotoluc]

Luc,

I use the Tektronix "OpenChoice Desktop" free application to capture / display my screenshots which can be found here:
http://www.tek.com/oscilloscope/tds210-software

Itsu

Thanks Itsu, I give it a try.

@Gotoluc

In case your scope cannot do a Mean of a Math channel that multiplies 2 other channels (a current and a voltage), here is how to eyeball the power contained in the pulse created by a switched constant voltage source, just by looking at its current waveform:

Thanks for the details verpies

I hooked up my scope to just 2 of the 3 wires going to the coils just to see if there is anything to grab when it comes to bemf.  Surprisingly there doesn't seem to be much.
Mags

Hi Mags, thanks for your post. You're right, the frequency drive controlled motors would not work for what I'm suggesting.
I think the motors I was thinking of is the BLDC which have hall sensors to trigger the 3 mosfets.

Thanks for all your help guys

Luc