Quote:
Originally Posted by MrMin
Three cheers for Patrick!
I'm impressed at the level of detail. You wont find any other esc and bl motor manufacturer giving this level of info and care to their obsessed customers. Simply amazing. Oh...I might be asking for more info... let me just swallow this first.
The material plays a role in the eddy current losses - It should be non conductive ferrous/magnetic type material and the higher the switching freq the higher the eddy currents... I need to look up the equations from years back...
At the moment gut feel looks like: BL Motor Efficiency losses accountable by
80% resistive (wire), 7% eddy current, 7% magnetic saturation, (rest on other losses such as variable load/good&bad gearing/)...??
Open to suggestions...
I'm pretty sure this will not be linear. I'm gonna see if we can work out the math so we can do an accurate simulation plot & material swap/switchout compensation test... Maybe I'll get bored before I finish this project..lets see.
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The thinner the lamination material, and the less electrically conductive, the lower the eddy current loss at a given frequency.
We are using .2mm thick laminations -- very thin electrical steel.
The electrical grade is the M19 rating -- that is watts loss per pound on a standard scaled system. M19 is the best commonly available thin electrical silicon steel.
Most brushless motors sold for the hobby use .35mm M30 electrical steel, which is very cheap (about 1/4 the price of .2mm M19) and commonly available in China, but is a poor choice for brushless motors IMHO.