Originally posted by ldissing
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Areas a and c are energy inputs from the magnetizing winding, whereas c and d are energy inputs that electrical engineers never consider, because that energy is supplied by the aether.
If you run the motor over the lower flux density range, which is normal, then you operate at an efficiency which can not exceed (a+b)/2a, which is 100%. On the other hand, if the motor operates over the higher range, the efficiency can reach up to (c+d)/2c, which is very much higher than 100%.
Consider some realistic figures by putting the knee in the curve at 15,000 gauss and assuming that the incremental B/H ratio is 1000 over the lower range but only 50 over the upper range. Operate the stator core of the motor up to a B value of 20,000H ranges from 15 to 115 over this upper range. Work out the area c as being (15_115)x5000/2 or 325,000 and the area d as being (15,000 + 20,000) x 100/2 or 1,750,000. You will then see the operation close to 319% efficiency is indicated.
Am I right to assume that to get the best gain we need to:
- Turn off power H when the magnet B almost saturated / linier.
- let the magnetic field B reach half it's saturated state, not too soon, not too late.
- turn the power again until almost saturated
- repeat
No idea how we know the saturation level of the magnet though...
We are all learning, some more than others. Matt has very good skills, both expermentally, and intuitively, so I do not intend to offend him, but I don't always succeed. He and you are the leaders in this technology, I'm still learning. I wish I knew a lot more about impedance, even though my "college" learnin' was in engineering, analog was the thing I hated most. Now I know it was important....but it was probably not totally correct anyway. I'll just keep plugin' along and maybe learn something one of these days.
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