Hello everybody !
Pardon my poor english, i'm french, but i'll try to do my best !
I launched a project : make my own gopro gimbal. With the aim of decreasing actuals prices.

I would like to buy an adequate brushless motor, but there are so many models, i lose myself.
I know only recently (2 days) the differences between technologies, but i understood that for my use, i would need a little kv, and a big number of pole pairs.
For the KV, i don't know how to choose... Between 210 and 70 ?
Should the engine to make at least 1/4 turn in 0.5 seconds.
Thereafter, the objective is to control these moteurs with a dspic from microchip.
I saw that there are sensorless and sensored motors. I think i need a sensored.

I noticed these 4 engines : are they convenient ?
For the first, there is no information, does anyone knows it ? It seems to be ok, bus i have no informations about current voltage. And is it sensored or not ?
http://ladroneshop.com/fr/brushless-gimbal/713-moteur-special-brushless-gimbal.html

-The second, I don't understand of the words "smart gimbal"
http://www.dys.hk/ProductShow.asp?ID=15
what differences with this one ?
http://www.dys.hk/ProductShow.asp?ID=107

- The third intrigue me for his price : why so cheap ? Because it's the KV who is indicated, that means that the motor is not sensord ?
http://www.hobbyking.com/hobbyking/store/__43040__2804_210Kv_Brushless_Gimbal_Motor_Ideal_for_GoPro_to_Compact_Style_Cameras_.html

- And the last. Nothing to say, just to show you.
http://kopterworx.com/ipower-gbm2212-80t.html

Thank you very much for your informations. And if you see mistakes in my english don't hesitate and tell me !!!