Winding Basics
 

I know some people don't know the requisite information (as I don't) regarding the effects of windings & gauge etc etc... so lets get the info togeather

Higher Windings =
Lower Windings =
Max Suggested Windings =
Min Suggested Windings =
Higher Gauge Wire =
Lower Gauge Wire =


if there is anything I'm missing let me know. I plan on updating this based on the info I recieve to keep the info current.

oh and, we should probably include a tutorial as to how to actually wind your own motor.


sherif

Here is a good link on winding a motor, with lots of pics:

http://www.carmoworld.com/parts-motor2.htm

Anyway, a couple of answers to your questions:

Less turns: Higher top speed, higher current draw, lower torque, shorter battery life.

More turns: Lower top speed, lower current draw, more torque, longer battery life.

Max suggested windings: I'm going to go with 85 for these motors. That's what the stage 1 uses, and I don't see why you'd want to ever go more than that.

Miniumum suggested windings: Definitely more than 25... :lol: 25 turns is unusable even with Neodymium magnets. PN Racing sells a 35 turn armature, that's the lowest I've seen so far in a 130 style motor. (540 motors like the 1/10th scales use often go as low as 8 or 9 turns, but that is because they are a larger motor with much more torque)

Some of the other important variables in motor design are the magnets and brushes. Particularly, the spring tension of the brushes on the commutator can have a large impact on the performance of a motor.

how do they effect the performance?

Brushes: Lighter spring tension gives more speed. Too light causes arcing and poor performance.

Magnets: stronger gives more torque, less top speed. Weaker gives more top speed but less torque.

Quick Questions:

how do you pull the tabs back on the XM armatures?
anybody every try doing say like a 30T Double like the larger size motors?
what are the effects of gauge sizes? what are the changes in going up or down in gauge size?

sherif

35 double turn

how bout a 264 turn...talk about tourque..wow

i also have made a ~10turn triple..motor...it has awsome speed...and it wont fry ur esc, it'll fry ur batteries..lol :D

rmyc, maybe you can help me then, I'm trying to get a motor to have decently hi rpms (30K +), with a lot of torque in the mid to high rpm range without frying the stock esc. To explain my application, I've built a drift car and I want to run it with the 4.40 (yellow) gear set. With my Spinbrush Hybrid (using the stage 2 armature), I can get the car to break traction of all four wheels on garage cement, but I still want even more torque, b/c the car can bog (due to the gearing) mid turns etc...


additionally, can you tell me if there is any problem with this winding technique. The black line indicates the direction of the wire winding:
http://www.freebmw.net/sherif/arm.jpg


sherif

as far as i know the winds should overlap like this

cool.. well then what do you think would be the best way to achieve my goals... I have 22, 26 and 30 gauge wire.


sherif

the thicker the wire (smaller gauge) the more the torque, but less turns would fit on the amature ,which leads to less speed....it's all about balancing out the number of turn to that gauge of the wire

you mah also want to upgrad to neo magnets :
http://mini-zracer.com/shop/product.php?pid=327
it adds a ton of torque
tinyrc's sister site has great deals on them.

a full ball bearign can would help tons

That is the full story- More current, more tourqe. More tourqe, more speed.

Simply unwinding your stock wire will decrease tourque and increase speed. Replacing it with a smaller gauge (bigger diameter) will increase tourqe and speed, but your batteries and PCB can only flow so much current, which is why tourqe drops. Inductance also affects the tourqe-speed balance, and windings effect inductance. That's why some 1/10 motors have multiple winds (10T double, triple, etc.), to alter the inductance, decreasing tourqe for more speed. Better magnets are usually a plus, different winds can negate the speed loss. 1/10 motors just use insanly strong magnets, especially for "punchy" applications such as touring cars.

Of course, the size of the motor limits your winding options as nuero pointed out. If you could wind one with 10T of 8G wire, and had the current to do so, it would be faster and tourqier, as well as draw huge amounts of current.

Nathan, thanks for your input!

I wound a 43turn armature w/ 30 gauge. I love the speed of this setup, now I just need to pick up a BB can with Neo magnets... I think this should do: Yeah Racing


sherif

That case will definatly do. I didn't know dinball carried that stuff...