mwkeefer wrote:I've only ever built 1 electric motor from scratch, I was 6 years old and it was nails, magnets and that Green xmas wire for windings - add 9v battery and a flick of the finger (can you say pedalec) and I was hooked for life.
mwkeefer wrote:Um... fellas maybe title should include the word Electric, ie: "ES DIY Electric Motor Challenge" - or can I submit the my wenkle design rotary gas powered ebike/lev hub motor? - (Kidding and no, I won't do the photoshop)
liveforphysics wrote:Who ever can make the most torquey design by weight could also be the most powerful by weight with enough voltage and adquate rotor material strength.
Thanks for that. I love itfechter wrote:Here's an interesting motor design: http://www.evilmadscientist.com/article.php/HomopolarMotor
I think the weight limit is fair, it's just that you are trying to build a train motor and the rest of us would like to build a BICYCLE motor. Maybe we can set a secondary test that will award the entrant with most power so that larger motors will win this shootout?
John in CR wrote:Miles,
Won't a larger diameter result in greater torque for a given weight more than higher efficiency would? If it's not as efficient then it just needs better cooling.
4Nm of continuous rated torque per kg of motor weight - passive cooling only - for a motor weighing under 3 kg?
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