I have a few Microwave turntable motors, its rated 120 volts @ 4 watts. there are others rated at 21 volts ac. Interesting observation was that I was turning motor as a generator and quickly lit up 90 volt neon with some natural resistance from all the internal gearing but to my surprise once I shorted output leads together it got easier to turn! I did same experiment through bridge rectifier and then shorted the DC outputs and got the same results; Easier to turn handle of generator if leads are put through maximum current draw, (SHORTED). p.s they are excallant for charging 200-400 volt electrolytic capacitors. Please let me know your thoughts.
No Lenz a.c. generator
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- Last Post 17 September 2017
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Chris
posted this
09 September 2017
Hi Penno555 - Welcome and thanks for sharing!
Youre right, the Time Rate of Change of the Magnetic Fields are the Key, this is Electromagnetic Induction!
If one wants Power, then this is how it is Pumped or Transformed. Motors/Generators are a good platform for learning!
Chris
Zanzal
posted this
12 September 2017
So, is it normal for a shorted AC motor to be easier to turn? I'm not really a motor expert but everything I've heard leads me to believe a shorted motor would normally be the hardest to turn. Why would this motor be easier to turn?
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perro555
posted this
12 September 2017
Yes in fact most motors that can act as generators (having magnets inside) can be incredibly hard to turn once shorted. If you have a small 24 or 12 volt dc p.m. magnet motor try for yourself; try turning once you short the 2 leads. The pick up coils turn into electromagnets the more you draw current from the generator therfore the higher the resistance to turning. Im trying to find out why its easier with these motors but one thing is the coil of wire runs parallel to rotating magnets and not the usual perpendicular way same way the coils run on those cheap chinese flashlights that are hand cranked, the coils run in a circle with the magnets.
perro555
posted this
12 September 2017
- Last edited 17 September 2017
I've attached a file with picture of a hand crank generator; notice coil runs in same direction as magnet movement??
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perro555
posted this
17 September 2017
After researching these coils further, this is what I've found out; magnets run along long axis of coils so they should not produce electricity but I did find small metal flaps that do run 90 degrees to coils and since magnets do not produce electricity the magnetic current that flow on these metal flaps do run at 90 degrees to coil and do produce electricity since the magnetism follows the metal flaps. Conclusion: magnets dont experience lenz force because they are not "fighting" the coils but the magnetic current that flows from magnet to metal flap does produce a current without negative consequence to rotating magnets
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perro555
posted this
17 September 2017
P.S. Bucking coils produce bucking magnetic forces that cancel to zero, so along these lines you can in fact make a generator that will not buckle down to high current, in other words you can in fact cause a net zero lenz force so whats the hint? Dont use a single core ( like in all 99.99 % of generators ) you must pair it so the more current you draw from source the more you cancel out magnetism (buck it)
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