I found these motors on hobbyking. according to the description they have been designed for quadcopter use. link

 

I also know the motors for arducopter where also specifically designed for quads

 

So what makes a quad motor, a quad motor?

 

The one thing I can notice is the large diameter outrunner for increasing torque for directly driving propeller to create lift.

 

what else? what are all those poles for?

Tags: brushless, motor, quadcopter

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I don't really know the answer to your question (high pole count) but the thing I think is attractive about those motors is the built in prop saver and I also really like the low profile although i can't imagine it actually improves performance but it looks cool! :-)

ideal quad motor (imho)

 

short shaft (wont break or bent that fast)

no protruding shaft (possibility to mount two motors coaxially, ease of mounting)

low kv (better for heavy lift/big prop quads)

mount with possibility to attach the motor to 10mm/15mm square bars without drilling them twice (ease of setup, possibility to move the motor, strength)

and long cables (i really want a motor for less than 15usd with long cables at hobbyking) 

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