R/C Electric Motors For EDF and Pusher-Prop Parkjets
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Axi: The first two digits of the number are the stator diameter in mm: the second two, its length. The full designation of the motor includes the number of turns of the winding, found after a slash. For example, the 2212/34 has a 22mm diameter stator that is 12mm long, and it has 34 turns of wire.
Mega motors: Similar designations - Mega 22/30/3 has a 22 mm-diameter case x 30-mm-long rotor, and a three-turn stator.
Aveox: An Aveox 27/13/3 seems to use the following: 27-mm diameter of the outside of the motor (not the rotor!) and 13 mm is the length of the rotor while three is the number of turns of the stator.
Hacker: A Hacker B20-26S is 20 mm in diameter, with the “S” indicating short length (L is for long) and is a 26-turn stator.
KV ratings: Kv gives the rpms produced by a motor per volt applied, i.e . if the motor has a Kv of 2000 and you run it on 6V it will turn at 12000 rpm.
Number of Turns: Turns are much like gearing! The higher the number of turns, the larger the propeller you can swing, however, the lower the maximum current it can withstand. Brushless motors that come in 1-, 2-, 3-, 4-, and 5-turn varieties are usually the internal-rotor type (but not always like the Hacker!). Brushless motors with high numbers of turns (say 10-30) are usually the external rotor (outrunner as we call it) type like AXI, Nippy, PJS, and the new little Hacker Baby.