Originally posted by Turion
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Wow, that's a lot of info. I want to comment on one early item where I'm mentioned, namely the coil and core remark. Yes, I do like to differentiate or specify each separately. The coil(s) and core(s) are separate aspects to or subsystems of the generator (or motor). Each is responsible for different behavior, or effects. Early on, when we were discussing cogging, you kept referring to coils when it is only cores which cause cogging and coils have no influence. Similarly coils have no influence on core losses, or magnetic drag, only the core(s) and magnets do.
Lately you've been evaluating different core material. Although core permeability can affect coil performance, the core loss (eddy current and hysteresis) are the overwhelming contributor to heat generated in the core. As such, core loss characterization tests, and I have done these, are typically conducted without armature coils in place. This would be particularly relevant due to the nature of loss at no-load caused by the bifilar coil. I realize in your machine configuration testing with cores and without coils may be problematic.
I'm glad to see you in a civil discussion with a member. Unfortunately it occurs on a thread where I avoid posting. I hope you learn some things from this fellow.
Regards,
bi
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