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?
enoob wrote:Other than a CA to see whats happening when i ride and sending one to thud (still not kidding T) i consider the best "test" to be real world. bolt it to a bike ride and see what happens. bench testing only tells you what happens on the bench not to say i wont bench test BUT how fragile is it ? 98.9 percent efficient and 20Nm per pound is great and all but what if the first bump in the road or the kick stand melting through ashphalt tips the bike and the motor bends ? wheres your efficiency then huh ?
Miles wrote:How about:
Over 4Nm continuous torque per kg of motor weight.
Less than 3kg in weight.
No energy input other than that to the motor itself.
Capable of practical use on an electric bike.
So, how is it clearly outstanding? Because it looks cool?MitchJi wrote:If one motor is clearly more outstanding than all the others they could qualify for something like a "Best in Show".
Thud wrote:I am building a dyno.
I am thinking an infra-red thermometer might be a nice add on to keep from smoking a motor on the dyno.
Thud wrote:I am thinking an infra-red thermometer might be a nice add on to keep from smoking a motor on the dyno.
Miles wrote:So, how is it clearly outstanding? Because it looks cool?MitchJi wrote:If one motor is clearly more outstanding than all the others they could qualify for something like a "Best in Show".
Then we have to wait until "everybody" finishes? Or what, a relay?John in CR wrote:Since these are torque machines, then the highest torque density under continuous operation should win.
I was thinking: the builder adds a thermal sensor to the windings during construction, so you just have to plug it in. Just an idea.Thud wrote:I was thinking non contact for ease.
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