Understanding motor turns
 

I am totaly confused on what motor turns mean , at first i was told the lower number of turns means slower speed and higher torque. but i see 35 to 55 turn motors being used in crawlers so i must have been told wrong. Also what is the difference between hand wound motor and machine wound motors as far as quality and performaence is concerned.

The lower the number of turns the slower it is and the higher the torque. Because torque is so important in a crawler you see a lot of people use a 55T. BUT a 55T has low speed so some people will go up to a 45T or 35T for the wheel speed. Which can also be important in some situations. It can also change based on the battery you have. You'll have less punch and speed with a nicd 7.4v battery than you will with a 3S lipo.

Brushless Motors

SINTERED ROTOR MOTORS
21.5 - Slowest Motor (comparable to a 55 turn lathe or crawler motor)
18.5 - similar to a 45 or 35 turn lathe or crawler motor
17.5 - Very close to a 27 turn stock motor
13.5 - Slightly faster than a 27 turn stock motor
10.5 - Slightly faster than a 19 turn motor
8.5 - 13-15 turn motor
7.5 - 11-12 turn motor
6.5 - 10-11 turn motor
5.5 - 9-10 turn motor
4.5 - 8-9 turn motor
3.5 - 7-6 turn motor

BONDED ROTOR MOTORS
EX13.5 - Close to a 27 turn stock motor
SS4300 = EX10.5 - Close to a 19 turn motor
SS5800 = EX8.5 - 15-17 turn motor


Brushed Motors

55 Turn = slow

7 Turn = fast

Machine wound = done by a machine (cheaper motor)

Hand wound = done by a person (expensive)

the lower number of turns or wraps on the armiture the less resistance making it a faster motor.. 55-80 turn motors are slower.. lathe motors...

and iam not sure the differnce in machine vs hand wound...iam assuming hand wound should be better quality.. every motor is checked.. machine wound, maybe every other or even every 50th motor would be inspected.

ok so i had the turn therory backwards , as far as hand vs machine is there a performance difference.

quality would be the big difference.... and like lidebt2 said.. hand wound more expensive... payin a guy to wrap each armiture one at a time vs. payin the same guy to sit and run a machine that does all the work..

It's easy to come to a conclusion about the difference between hand vs. machine wound motors by the name alone. That's not the only difference though. Even hand wound motors do vary from different manufactures.

Some of the key traits in a good hand wound motor....

Bigger comms
Truer comms
Better hood design
Better quality magnets
Better brush styles
Balanced armature
Better can design

All of which can contribute to better bottom end power,quicker response and longer life.

Personally,I prefer Holmes Hobbies handwounds. He's got a few different handwounds to choose from. IMHO,they are some of the best motors out there.

thanks guys , didn't realize how much there was to picking a motor.

Re: Understanding motor turns
 

Besides the produce way(man or machine) and price, what's the difference between machine wound and hand wound?

Re: Understanding motor turns
 

What he said... There is a noticeable power difference in handwounds over machine wound.

Off topic: Holy zombie thread, hey at least some people do search "thumbsup"

Re: Understanding motor turns
 

Thats some good info. Thanks

Re: Understanding motor turns
 

Don't forget that batteries also affect motor speed. A 45t motor with a two cell lipo battery will be slower and have more torque than a 27t motor on the same battery. But, a 45t motor on a three cell lipo battery will be almost as fast as the 27t with the two cell. Remember, sometimes torque gets you over obstacles and some times wheel speed gets you over obstacles. A good mix of both is what we all need.

Re: Understanding motor turns
 

This helps a lot for me. It was what I thought after tons of reading but nice to see it confirmed.

Re: Understanding motor turns
 

How do these compare to the Tekin hand wounds? Are they in a completely different class and something I would notice crawling?

Re: Understanding motor turns
 

Thanks Guys nice easy explanations...

Re: Understanding motor turns
 

Higher turn dont always mean more torque. Better start up, slower top speed, and longer battery life mostly. A good hand wound will have the wire contact pattern optimized for better performance its an art form. Pick a wheel speed you like for the volts your gonna use and get the best motor you can afford thats how i pick them. Oh yeah Holmes or Brood best brushed going. "thumbsup"

Re: Understanding motor turns
 

axial scx10 brushed stock motor is 27T

CMIIW

Re: Understanding motor turns
 

In continuing the zombie thread (great find BTW). How does KV fit into this mix? Seems like for brushless people are saying to get 3300kv or 3500kv or whatever. How does that compare to the turns?

Thanks!

Re: Understanding motor turns
 

Besides price and construction, a handwound will produce a lot more torque and typically have better startup control. My machine wound motors have great startup too since they were designed as such, but do feel "mushy" under load compared to a handwound. The mushiness makes startup more difficult to control, when the motor is unloaded it will increase in RPMs more, which can cause the rig to surge off the intended line.


Brushed motors can vary quite a bit in unloaded speed between styles of motors, so sealed can 27t might be faster unloaded than a Pro handwound, but slower than the handwound when in a rig. Loaded RPMs VS unloaded rpms will be lower as compared to brushless of a similar KV. But these are general numbers useful for comparison of speed.

10t five slot 550 (crawlmaster style) 2300kv unloaded
12t five slot 550 1700kv unloaded

13t five slot 540 2300kv unloaded
16t five slot 540 1700kv unloaded

27t is about 540 2100kv unloaded
35t is about 540 1500kv unloaded
55t is about 540 1000kv unloaded

Re: Understanding motor turns
 

So if my understanding is correct... for brushed the HIGHER the number the more torque there is and the slower the top speed. For brushless, the LOWER the kv the more torque and slower top speed.

Thanks! Now I just need to figure out which brushless gives OK crawling and OK speed (25mph tops on 3s). More research!