pauln28

My Feedback: (2)

I'm wondering if someone could give me some insight on these servos. For 3-D flying which of these servos are better?

BarracudaHockey

My Feedback: (11)

Digital servos are coreless. Your talking analog/digital, in most cases, digital have more torque, speed and hold and center better at the cost of more power consumption and greater purchase price. (among servos of a similar class)

Edge 540

Actually no. Most of the hitec low end digitals are 3pole motors, and all futaba digitals beginning with a 3 are cored motors as well. 3050...3151...3152..
hitec 6635...5475...5625... all have "cored" motors

___

No. The 3150 is coreless.

From Futaba's homepage:
What is a 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. This design results in smoother operation and faster response time.

You can read about digital servos here: http://www.futabarc.com/servos/digitalservos.pdf

Jesper

pauln28

My Feedback: (2)

Okay, thanks you guys. I wasn't sure if ALL digital servos were coreless. Looking at Futaba's long list of servos it looked like you could buy digital's that were not coreless. So would you say the coreless servos would be better for 3D or the digitals?

BarracudaHockey

My Feedback: (11)

What sort of 3D plane are you getting? On a foamie I doubt you'd notice the difference, on a Funtana 90 you surely would.

JoeAirPort

My Feedback: (41)

I'd say coreless are better for 3D. They are faster since there is less inertia in the rotating part of the servo motor so it will accelerate the surface faster.

Also to clear up a few things. Don't confuse analog/digital with 3-pole/coreless. There are coreless servos and 3-pole servos. Then there are digital and analog servos. These are two different features of a servo. So you can have digital that are 3-pole and digitals that are coreless. You can get analog servos that are 3-pole and analog servos that are coreless. The coreless will give the better speed the digital will give you the better centering and tighter holding position error. Put them both together and you have the best servo on the market.

pauln28

My Feedback: (2)

I'm putting them into a Gene Soucy Extra 1.60. Thanks JoeAirPort that really helps

mglavin

My Feedback: (31)

The 3150 is NOT a coreless servo. As Edge noted all Futaba servos that start with the letter "3" in the part number are cored 3-pole motored. You can confirm this on Futaba's webpage if need be.

Trogdor the Burninator

Here's a pretty good pic of a coreless type motor and description



http://www.rccaraction.com/articles/digital_servo2.asp


here's some info on cored motors also

http://www.hitecrcd.com/education/motors.htm

ok, I'm still looking for info myself, here's a nice exploded diagram

http://www.namiki.co.jp/mobile/vibshikumi-e.htm

Mouton

Just a question here, Futaba has Digital servos with coreless motors and they also have Digital servos with digital motors. What would characterize the digital motor in these servos?

MikeMayberry

My Feedback: (1)

Digital refers to the amplifier; not the motor. There is no such thing as a digital motor.

Mike.

dirtybird

My Feedback: (5)

There is in fact a digital motor. Do a google search and you will find lots of them. They are also known as a stepper motor. R/C servos don't use them though.

dirtybird

My Feedback: (5)

There is in fact a digital motor. Do a google search and you will find lots of them. They are also known as a stepper motor. R/C servos don't use them though.

MikeMayberry

My Feedback: (1)

Well then.. I stand corrected! But you really didn't have to rub it in by telling me twice!

JNorton

My Feedback: (2)

I've yet to see a servo use a stepper motor. Be kind of interesting trying to figure out the control circuitry. Also steppers are inherently slower than servos whether they use a digital or an analog amplifier.

So for the sake of comparing apples to apples lets just say in RC servos there is no such animal as a digital motor. Just different pole motors (3 and 5) and coreless motors and two types of amplifiers (digital and analog). Any type of motor can be combined with either amplifier.

John

OldRookie

My Feedback: (13)

What type of servo would be best for a twin engine set-up?
I would imagine they would need some precision.
How about Futaba S9650 or Hitec HS-5245?

Greg