Vertically stacked Stators and Rotors Permanent Magnet Alternator

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SUMMARY

The forum discussion focuses on a fabricated Permanent Magnet Alternator (PMA) utilizing vertically stacked stators and rotors. The design effectively employs the flux lines from both ends of the magnet, allowing for increased output at lower RPMs due to parallel connections of the stators, which reduce internal resistance. Testing results indicate that as more stators and rotors are added, the performance improves, requiring fewer magnets compared to dual rotor designs. The discussion raises the question of whether a mathematical model exists to predict output at higher RPMs based on the gathered data.

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BurnIt0017
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Greetings, I fabricated a PMA using vertically stacked stators and rotors. I tested the unit on a lathe and was able to gather the following data at different RPMs. The design uses the flux lines from both ends of the magnet. This configuration allows the stators and rotors to be stacked vertically. The stators are connected in parallel so the internal resistance drops, output increases at lower RPMs as more stators and rotors are added. The configuration uses less magnets than dual rotor designs with fixed internal resistance. Is there a mathematical solution to predict output at a higher RPMs using the data that I have been able gather?1 Stator ,
Amps , RPM, Internal resistance
0.38 , 190, 4.3 ohms
2.06 , 310
3.8 , 440
2 Stators
0.51 , 189 , 2.4 ohms
2.06 , 310
3.8 , 340
3 Stators
1.56 , 186 , 1.9 ohms
2.95 , 270
6.5 , 340
 

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Last edited:
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There are several online calculators for PM motors. Generators and motors are mostly the same thing. Try here

https://ecalc.ch/
 

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