Magnetic, or Attractive, Question

Correction; A permanent magnet will retain its magnetism unless it is affected by a strong (unidirectional and negating) outside magnetic or electrical force, A pulsating force does not have a net effect.

Still under water ?

Yep, Sitting on a log, waiting for me dog, here in the fog.....

water is a good thing, in the right quantities.

And Yes. Of Course. Alternating....!

thanks Fellas.

cheers mark N

So, why under the law of "efficiency" ie.diminishing returns, doesn't the "additive" lose out to the "Negative". At the RPM, in general speak it should diminish 'er Rapidly

And Thanks Guest. some poor Bastards are copping it up the bum, all around Queensland at the moment. Me. "I'm all right Jack" Just waiting for it all to subside, then chip and lend a hand. Rockhampton Check out this website...http://www.boston.com/bigpicture/2011/01/australian_flooding.html

there is a picture of a boat with a load of Roos.......bloody lovely!

Mark N.

"Impermanent Magnet Motor" would not be such a sexy marketing term, but in the loooooonnng run might be more accurate....

""Impermanent Magnet Motor" would not be such a sexy marketing term, but in the loooooonnng run might be more accurate.... "

According to entropy, ALL things considered permanent are not so.

Totally correct about demagnetizing a permanent magnet motor.

Had some problem in the past. Small Permanent magnet motor were used a truck.

They just turn on and off the motor by means of a switch, so no current limitation.

In the beginning everyting went well, but after a year, the permanent magnet field became weaker and when trying to deliver its torque, the armature took a lot more current and burnt.

Now they use 20 meters connection wire rolled up to a coil in the motor supply.

This is enough to limit the peak current at start.