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seanmanibog
10-31-2007, 05:48 PM
Quick question, with servo's, what does the motor type mean?

I was just looking at futaba's site and the different kinds were

3P, 5P, and CM.

What are the differences?

tylerbac
10-31-2007, 07:18 PM
3p = 3 pole
5p = 5 pole
CM = Coreless motor

These descibe the type of motor inside the servo.

My understanding (I have been wrong many time before) 3 pole is basic, 5 pole is better, Coreless is very good.

This has to do with speed, torque, holding position, and durability.:teacher:

st_dragn_wagen
10-31-2007, 08:07 PM
what is meant by "Coreless"? thats something iv never quite understood

bigboots1302
10-31-2007, 10:17 PM
they also have some brushless servos

seanmanibog
11-01-2007, 01:09 AM
Sweet I should be gettin here sometime soon a Futaba de9451 coreless servo from a trade soon. Awesome!

Giant655
11-04-2007, 06:41 AM
its kind of hard to explain how coreless is better but I will try anyway. imagine a gear with a couple teeth on it, when you turn your wheel 10-15%, it instantly clicks to 25%, thats how the 3P and 5P motors work, whereas the coreless motor will go to where you put it. There is more positional correctness about it lol. There!!! confused yet??!?!?! cause I sure as hell am lol

broncobill
11-04-2007, 08:51 AM
its kind of hard to explain how coreless is better but I will try anyway. imagine a gear with a couple teeth on it, when you turn your wheel 10-15%, it instantly clicks to 25%, thats how the 3P and 5P motors work, whereas the coreless motor will go to where you put it. There is more positional correctness about it lol. There!!! confused yet??!?!?! cause I sure as hell am lol

It sounds alot like the differences between a msc and esc, without the power drain.

tylerbac
11-04-2007, 10:19 AM
yes much like the difference between an msc and esc.

Duster_360
11-04-2007, 12:13 PM
From Futaba's site -

Coreless motor
In a conventional servo, the motor has a steel core armature wrapped in wire that spins inside the magnets. In a coreless design, the armature uses a thin wire mesh that forms a cup that spins around the outside of the magnet eliminating the heavy steel core. A coreless motor does not have magnets as standard servo motors do, so they have a smoother, more constant, and stronger action. Regular servo motors have either 3 or 5 magnets (poles) which when the armature is between these, the servo motor is at its weakest.