I am not questioning what your post, I am simply curious why your use of the terms Back EMF overlap with the definition of Inductive Kickback"...Its clear that when dealing with a motor we aren't just dealing with the effects associated with commutation (spikes).....we also must contend with the very real induced voltage(s) both in the armature and in the stator, the prior being of immediate interest owing to its effect on consumption.   Would you be so kind as to elaborate as to why your interest is on the spikes instead of induced potentials associated with current limiting, and why you choose to use the term back EMF where inductive kickback would be more applicable.

Just a quote I grabbed where Back EMF is discussed, note, there is no mentioning of a spike, this leads me in the most cautious manner to assume that the mechanism for generating the spike is not "immediately" associated with Back EMF, as Back EMF is defined above, and with that, it becomes necessary to differentiate.

Regards

What you say makes perfect sense.  If I rewrote it I would use the terms "inductive kickback pulse" or "flyback pulse" instead of BEMF in order to be clearer.  I will try to keep that in mind for the future.  I think the message still got through though because Tinman and Luc will discussing collecting pulses off of the motor from PWM excitation when the MOSFET turns off or possibly from the brushes themselves.  I assumed that was what Jimboot was referring to.

For what it's worth I normally use the term CEMF for what's going on in the armature.  That is also legitimately referred to as BEMF like you indicated.   And Farmhand also has a valid point in referring to the flyback pulse as forward EMF.

MileHigh

@Tinselkoala,

One of your fumbelings:

 "produce" or rather INDUCE currents in the stator coils,

Try generate!

Same event as Brad ?

Is that the pulse motor build-off by any chance? Got a link?

Is that the pulse motor build-off by any chance? Got a link?

No poynt-not the pulse motor build off.
The PMBO is normally in October-depends on when Russ is ready.

@Tinselkoala,

One of your fumbelings:

 "produce" or rather INDUCE currents in the stator coils,

Try generate!

Synchro1 I agree with TinMan that this is not the thread to do this in.

I'll leave it as an example for others to know what's not tolerated.

Luc

Gotoluc, this video intreagues me with how little it takes to free the
metal.
https://www.youtube.com/watch?v=i91F5VQD4JM

Would it be possible to then check and see how many joules are
collectable from the reapplied magnetic field after the pulse stops?

What you have is a circular version of the Kunnel patent from Germany that was
said to work but not as draw in the patent which was only straight.

Norman

Yes Norman, all this and more will be done in time. I'm just a little limited with time for the rest of this week.

Luc

Coughcnutcough

This may or may not be related I honestly dont know if this video is real but if it is it seems to be using roughly the same design as this generator research https://www.youtube.com/watch?v=mB1Wtve7aug