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Old Mar 22, 2015, 04:55 AM
Registered User
Joined Nov 2014
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Barrel motor apps

I want to know when i use barrel motor? and when i use disk motor?

I know barrel motor gives HIGH RPM and LOW TORQUE so we connect low diameter propeller to it.

and disk motor gives LOW RPM and HIGH TORQUE so we connect big diameter propeller to it.

But i wonder

what's the application i need HIGH RPM ?
what's the application i need HIGH TORQUE?

thank you!
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Old Mar 22, 2015, 06:45 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
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Have you read my answer in your similar other thread? No use starting a new thread, introduces only extra/double work. Better continue in that thread. Try to make your question/problem more specific, if possible, do you have a plane in mind? Span, weight, name, type, link?

This subforum is about Electric Motor Design and Construction, rather techno-geek-speek, about the inside of a motor, not about motor application. Your question is better of in the Power Systems subforum, that subforum deals with combination of plane and motor, more answers there.

To have your thread/discussion moved, click the report button above your post and select
move this thread
Power Systems

Vriendelijke groeten Ron



Vriendelijke groeten Ron
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Last edited by Ron van Sommeren; Mar 22, 2015 at 08:58 AM.
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Old Mar 22, 2015, 08:04 AM
Condescending Pedant
Joined Aug 2013
1,197 Posts
You might read this discussion, started by yourself about 5 days ago. I am wondering why you would post essentially the same question again, when you never participated in the other thread.

http://www.rcgroups.com/forums/showthread.php?t=2370571
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Old Mar 22, 2015, 07:29 PM
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because all answers was about construction, but i asked about applications not constructions.

I want to carry object 500 gm for 8 minutes, why it's recommended to me use disk motor not barrel?
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Old Mar 22, 2015, 07:46 PM
Ochroma Pyramidale Tekton
Fly Wheel's Avatar
Blackstock, South Carolina
Joined Sep 2007
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Welcome to the forums, where you have to sift through 5-10 irrelevant, off topic and misunderstood replies to find something close to an answer to your original question
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Old Mar 22, 2015, 08:59 PM
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Australia, VIC, Melbourne
Joined Feb 2010
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Quote:
Originally Posted by Sky limits View Post
because all answers was about construction, but i asked about applications not constructions.

I want to carry object 500 gm for 8 minutes, why it's recommended to me use disk motor not barrel?
This on a quad?

AFAIK the reason most quad motors are flattened disc shaped is because a larger diameter stator is better for high torque (which is good for large props) but the motors dont need to be that powerful, thus a short stator.

You can use whatever motors you like, but the flatter ones might be a bit lighter. I doubt there is that much engineering involved really.
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Old Mar 23, 2015, 06:34 AM
Condescending Pedant
Joined Aug 2013
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Quote:
Originally Posted by Sky limits View Post
because all answers was about construction, but i asked about applications not constructions.

I want to carry object 500 gm for 8 minutes, why it's recommended to me use disk motor not barrel?
My first response to your first question was mostly asking for clarification as to what you meant by barrel VS disc. Those are not common terms used to describe motor characteristics so I thought it would be best to get clear on just exactly what you are asking.

You should close one of these threads so that all discussion will be collected in one thread. That will make it easier for us all to review what has been discussed, and add to that discussion.
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Old Mar 24, 2015, 06:22 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
11,314 Posts
Quote:
Originally Posted by Fly Wheel View Post
Welcome to the forums, where you have to sift through 5-10 irrelevant, off topic and misunderstood replies to find something close to an answer to your original question
Quality of answers depends a lot on quality of question.
Quote:
Originally Posted by Sky limits View Post
because all answers was about construction ...
That's what you get when posting in the Electric Motor Design and Construction subforum. Nevertheless, I already gave you 43 answers explaining the differences between in- and outrunner applications. But all one needs to look at is Kv and max.current (max.power is less important), the motor is a black box.


Do yourself, and us, a big favour, some reading for rainy/windy days.
Will prevent you from burning several controllers and/or motors and/or battery.

E-flight 101 by RCG member Ken Myers, will at least save you a ruined LiPo (or worse!), a burnt motor and a fried ESC:
The Ampeer
→ Electric Power Basics

followed by
The Ampeer
→ Everything youw wanted to know about e-flight (Ed Anderson)
Table of Contents
  • What You Need To Know About Receivers
  • What function goes on which stick?
  • Battery Basics
  • Amps Versus Volts Versus C
  • Lithium Battery Chargers
  • ... ...
  • Understanding the Electronic Speed Control (ESC)
  • the Low Voltage Cutoff Feature (LVC) Of Your ESC
  • The Role of the Battery Eliminator Circuit in Your ESC (BEC)
  • Sizing Power Systems for Electric Airplanes
  • Prop Versus Amps
  • What Do the Kv Numbers On Motors Mean?
  • Who Needs a Wattmeter/Power Meter? (everyone!, RvS)

www.scriptasylum.com
→ RC calculations
→ electrical
system wiring
respectively ...
LiPo pack wiring
respectively
chargers (2 menu items)
The other menu items and demos are also veeeeery handy/instructive for e-folk, add site to your favourites?

www.ezonemag.com
→ FAQ

Vriendelijke groeten Ron
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Last edited by Ron van Sommeren; Mar 24, 2015 at 06:40 AM.
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Old Mar 24, 2015, 12:08 PM
characters welcome!
Mark Wood's Avatar
United States, CA, Bear Valley Springs
Joined Feb 2000
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Oh c'mon, Ron. People don't want to do all that research. They want to be spoonfed the answer pretty as you please, ya big meanie.

mw
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Old Mar 24, 2015, 12:28 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
11,314 Posts
Quote:
Originally Posted by Mark Wood View Post
... ya big meanie.
6'7"/2m01 and 225pound/102kg
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Old Mar 25, 2015, 09:47 AM
characters welcome!
Mark Wood's Avatar
United States, CA, Bear Valley Springs
Joined Feb 2000
26,907 Posts
Quote:
Originally Posted by Ron van Sommeren View Post
6'7"/2m01 and 225pound/102kg
I rest my case.

mw
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