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

[itsu]

Partzman,

my understanding is that your "red Math Mean -125.8mVV" value is the mean value from the total screen (so the 10 horizontal divisions).
So not the the Math mean value of the area between the 2 vertical cursors which is what the question was.

You presently have displayed the values of the area between the 2 cursors of the yellow trace as amplitude and timing (upper right corner).
If you now activate the red math trace, in that upper right corner you will see the data of that red math trace (wattage and timing) inbetween the 2 cursors, but
i doubt it will be the calculated power delta as it does not match my full screen calculations when trying, but i will double check.

This might be interesting for Luc also as he has a similar scope.

Itsu

[gotoluc]

I don't think that your big ass low resistance coil is the problem.
It is much more likely that your C2 or D1 are the problem as well as your wiring (no-starpoint).

I don't know about the C2 resistance and why I gave you 2 different samples in case one is better then the other.
As for the diode, did you not see the quality of diode I'm using?  Ultra fast RHRG5060 paired which gives a 0.34v forward voltage.
This is the second time you mention wiring starpoint!... I never heard of this? what is it and can you show me a picture of what it would look like.

A high R_DS-ON MOSFET transistor could be the culprit, although 6A is not a big deal for most MOSFETs today.
The gate timing seems to be fine, and Hall sensor will not improve it.

The mosfet's are IRFP4310Z  120A and RDS 8.4 milliohm resistance, so I don't think this is the problem.

My McGyver circuit would improve it, but without these CD4047 chips it is very hard to get the LM3915 Vu-Meter to work as a sequencer...but not impossible

I can order some CD4047
Can you provide the complete circuit so I can make sure I order everything needed at the same time.
Could a on the fly pulse width adjustment capability be added to this?... and if so, what components are need to be ordered for that option?

I have 2 of the below outrunner motors. Do you think a circuit could be built to power it and collect the flyback to power the second one which would be attached to the same shaft?

Thanks for your time and help

Luc

[gotoluc]

Partzman,

my understanding is that your "red Math Mean -125.8mVV" value is the mean value from the total screen (so the 10 horizontal divisions).
So not the the Math mean value of the area between the 2 vertical cursors which is what the question was.

You presently have displayed the values of the area between the 2 cursors of the yellow trace as amplitude and timing (upper right corner).
If you now activate the red math trace, in that upper right corner you will see the data of that red math trace (wattage and timing) inbetween the 2 cursors, but
i doubt it will be the calculated power delta as it does not match my full screen calculations when trying, but i will double check.

This might be interesting for Luc also as he has a similar scope.

Itsu

I don't know? the scope I have access to is a TDS 2024B which by the way has very low resolution screen shots captures compared to your and why I started taking pictures of the screen to show more details.

Luc

[conradelektro]

Hi itsu (and Hi to all people who do decent measurements like itsu):

To find out if the energy in the spikes can be "fed back" to save power, one should do the following measurement:

1) You do the input power measurement with the motor running like you do in your video https://www.youtube.com/watch?v=dANzzD6X75E&feature=youtu.be

2) But then you do not stop the motor, but you disconnect the path to the capacitor (by disconnecting the diode). This will prohibit that power is fed back from the spikes. And now you measure the input power. Is it less or more?

I tried that several times with different pulse motors and different drive circuits. I never could prove that input power to the motor was less if one tries to feed back power from the spikes (from the back EMF of the drive coil).

I think that the power in the spikes is forever lost.

Greetings, Conrad

[gotoluc]

Hi itsu (and Hi to all people who do decent measurements like itsu)

So are you being selective to who you want to say hi to or what?

I've never seen such a written thing LOL

Luc