Rotating Magnetic Field's and Inductors.

[poynt99]

.99,

'Tis the Holiday season, a good time for warm drinks, colorful lights, and thought provoking analogies...

Why did you use two different sized boats in the analogy?  Would not the difference in sail porosity have been sufficient to make the point?  (i.e., identical boats, same size sails with different porosity)

As always, good to hear from you,

PW

PW,  .

In Guyla's example, the two magnets not only have different magnetizations, but different masses as well. The heavier magnet (galleon)) is stronger (lower porosity sail), and the lighter magnet (Zodiac) is weaker (high porosity sail).

Now, where did I hide that Baileys? 

[picowatt]

PW,  .

In Guyla's example, the two magnets not only have different magnetizations, but different masses as well. The heavier magnet (galleon)) is stronger (lower porosity sail), and the lighter magnet (Zodiac) is weaker (high porosity sail).

Now, where did I hide that Baileys? 

.99,

Thanks, now I get it.

Enjoy the Bailey's...

PW

[picowatt]

In the case of motors, I'd say the stator coils do seem to stand up to the definition of work. A "force" is applied (by the stator) and the object (rotor) moves in the direction of the force. But in this case, the force is electromagnetic in nature, and there is "work" done on charges as well by an electric field.

.99,

I was considering that if the field of the stator was considered as being stationary (i.e., not dynamic) that it was the dynamic forces that were actually doing work, hence my analogies.

I do realize it is all relative, but this was specifically with regard to the question Tinman posed, "does the stator do useful work?". 

PW

[MileHigh]

Perhaps you should go and  argue this point with verpies in regards to Itsu's test results.

Brad

No, actually for now, I am going to ignore Verpies' and Itsu's results and stick by everything I said in my posting.  There's no special case for magnets.  They are devices that can change the overall electrical impedance and related efficiency of electrical devices, no one doubts that.  But what they can't do is "useful work" or output "magnetic energy" on their own.  For example, if PW is correct and the spinning rotor is absorbing electrical energy during the energizing cycle and speeding up, and then kicking back that energy at the end of the energizing cycle and/or after the energizing cycle is OFF and as a result slowing slowing down, then the spinning rotor is simply acting like an invisible spring storing and releasing energy.  The energy goes from electrical to rotational (i.e.; mechanical) back to electrical.

[verpies]

In this analogy, the sail porosity is inversely equivalent to the magnet's flux density, ...

Just a reminder that the force of magnetic attraction is proportional to the gradient of the flux density, not to the flux density itself.