How does stator material affect performance?
Depends what you want to achieve. I used mild steel nails. Many experimenters preferred bolts, because they were easy to fix in place, and to adjust the air gap distance. If you want to optimize for rpms then pure iron was the material Mr Adams historically employed. If the back emf effect is most important, then black sand / magnetite is the best option. I would suggest black sand, as my thesis is that the Adams motor is primarily a pulse platform, rather than a drive motor. This was the opinion of Mr Adams as well.
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