Kawasaki VN750 Forum banner

The "Why" of Stator Failure?

7K views 31 replies 12 participants last post by  aquawaterfilter 
#1 ·
Hypothesis:

If the current from the stator has nowhere to go, such as with R/R or JB failure, excess heat in the stator is produced in a very short time.

Some machines are wired with the R/R going through the CDI. If the R/R fails or is unplugged, the engine doesn't run. Obviously, the VN750 isn't one of those.

Eddy currents are nuts, try dropping a magnet through a copper pipe! It defies gravity! Just a 1/2" water pipe and weak magnet will do, but the stronger the magnet, thicker copper, the stronger the effect. Quite a few of the videos out there. I've tried it myself.

Eddy Current Heat



Gravity Defying!

 
#31 ·
Ripple is continuous variation to what ought to be constant DC voltage.
It tends to be repeatable, smooth and (compared to spikes) small in magnitude.
It may or may not be measureable by a handheld AC meter.
Ripple causes damage primarily through heat, as the rising/falling voltage causes continuous current fluctuations through things like batteries and capacitors. They also cause annoying brightness variation in lighting.

Spike, are very sharp peaks in the voltage that may be random or repeatable.
Their magnitude can be anywhere from 1-2 volts to hundreds of volts.
Typically the duration of any one spike is very short, and won't be measurable by handheld meters.
Spikes cause damage primarily through over-voltage of sensitive devices (ECUs, LEDs and other modern electronics).

The line between spikes and ripple can be a bit fuzzy.

Batteries and capacitors can and do smooth out ripple (try running a car without a battery!).
Batteries are too slow to smooth out all ripple, which is where the capacitor can help.
Spikes are way to fast for a battery to smooth out. In fact, large capacitors can be too slow for spikes!
Spikes are best filtered by smaller capacitors.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top