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windings are the number of turns of wire wrapped up on the inside of the motor...
fewer windings are not better. they are better ifthey are what you need. someone else is more qualified to go in depth, but basically the less windings (hotter wind) the faster the motor will spin with a lower voltage. there is a motor constant kv that reflects the way it was wound... the hotter the wind (less windings, thicker wire) the higher the kv number. planes need to be as light as possible, so use a motor with fewer winds so it will run at a good speed on less batteries (less weight). there are tradeoffs, torque, necessary gearing, too many amps being drawn, etc... as with all electric planes, everything is a factor in a large equation, not an absolute. you don't always want a super-hot motor based on your gearing, necessary prop size, batteries that will fit in the plane... there are good points and bad. I find playing with kyosho motors in motocalc will give you a decent intuitive feel for the differences. |
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Windings
Inside a motor, wire is wrapped around or wound on a form. When current flows thru the wire a magnetic field is created in the form. The form could be the armateur (rotating) or a field winding (stationary in the case) (No Actro corrections please).
More winds or turns of wire increase the impedance of the motor. With a fixed input voltage like a cell, the more winds, the less current. Which is best depends on what you want. If you are using less than 6 cells (as a guide) you want few turns. If you are using 30 cells you want more turns and or a gear box. As Einstien said, "All of this is relative." A 12 turn car motor can not be compared to a 3 turn bushless motor. There are some more variables left out of this explanation for ease of discussion. The best number of turns is the number that gives you the current you need from the cells you have with the prop that will fly your airplane on your motor. Most motor manufactures like Max Cim, Mega , and Astro Flight have tutorial information on their web sites. Astro Flight has a book you can buy. Even better get Electricalc, or MotoCalc, or Use PCalc free on line to calculate what happens when windings are changed. Aveox also has an online calculator. Pick a motor setup with cells , prop etc. Then change only the windings and see what happens. Once you get used to that, change the windings and the cells and see what happens. Then change the windings and the prop and see what happens. This will give you a basic feel for what is happening. Hope it helps. |
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