Motor Data - test bench data for several hundred brushless motors.

Dr Kiwi · Dec 10, 2008, 11:49 AM

For many years several of us have been generating and accumulating test stand data for a wide variety of electric RC motors, but the information could only be found, frustratingly scattered, amongst a myriad of threads in RC Groups.

Now Robert Goble has taken it upon himself to set up and maintain a webpage which provides a central, searchable source for all the available data: anyone with reliable test data is invited to contribute their information to the cause! [I've never counted them up, but Robert found 245 different motors in my EXCEL Spreadsheet].

http://www.flybrushless.com/

Welcome to FlyBrushless.com

Mission Statement:
To standardize brushless motor measurements in a comprehensible way, and to provide radio controlled aircraft pilots with a common resource for comparing and choosing the right motor for their applications.

At this time, we are obviously still adding to/proof reading the data sets, so bear with us. [Adding in Io data and measurements, I've only got to letter G so far]. Much of the data posted so far is from my own testing [any and all errors are mine alone], but obviously lots of other people will add their data as this site evolves.

As far as my own data are concerned let me add a caveat to the way in which parameters such as Io have been measured, and Kv and Rm have been calculated - I run no-load and prop tests on each motor... I measure Io/rpm at several voltages but typically have entered the figure I obtained @ ~10v into this database [manufacturers, if they give you an Io, usually do not state the voltage at which their Io figure was obtained]. I then use a program such as Motocalc or Drive Calc. to calculate Kv and Rm. I cannot see that there can be much argument over Kv (even though there are occasionally great disparities between my figures and those posted by manufacturers - where do they get some of their numbers? - no-load rpm divided by voltage applied is a reliable guide to at least a ballpark figure). For Rm, I find that often my figures differ substantially from those given by manufacturers and distributors - they may be using Rm for one phase (I know Mega does that), or Rm for the motor directly, when, in my case, an ESC has to be in the system. Any suggestions as to obtaining the most accurate figures are welcomed.

We hope that this resource proves to be useful.

Cheers, Phil

rgoble · Dec 10, 2008, 12:26 PM

If you have any questions or problems with the site please let me know here.

Also if you have any ideas for improvements I would be glad to hear them.
Thanks,
Robert

Mark Wood · Dec 10, 2008, 12:38 PM

Quote:

Originally Posted by Dr Kiwi

P.S. How does one make this post into a "Sticky". Is that a good idea?

Already did!

For future information, you request a sticky using the Report Post To Moderator button and choose Stick/Unstick thread option.

mw

CuStOm · Dec 10, 2008, 05:30 PM

Awesome! Thanks for sharing all your hard work!
Cheers
Keith

olmod · Dec 10, 2008, 05:43 PM

Great

only suggestion i can make is to give the vertical columns colours ,as i work my way down i lose whats amps ect.
but a worthwhile data base IMHO.

rgoble · Dec 10, 2008, 09:37 PM

Thanks for the suggestion. I added a new header row that shows what the columns are ever 30 rows. That's about one every screen (at least for my resolution) and can be adjusted if needed. I was going to use the column colors as you suggested but I think this might work better.

I never realized the full extent of testing Phil did on these motors until I started adding his data to the site.

Robert

lake flyer · Dec 10, 2008, 09:40 PM

I registered , but did not get my confirmation email ??

rgoble · Dec 10, 2008, 09:46 PM

I'm not sure what happened there. I sent you a pm to verify your email address and I activated your account.

Robert

Ron van Sommeren · Dec 10, 2008, 10:16 PM

Add these measurements too?
www.flyingmodels.org

Vriendelijke groeten

Ron

rgoble · Dec 10, 2008, 10:22 PM

Is that your site or does it belong to someone else? I don't want to add someone's data with out their permission.

Robert

Ron van Sommeren · Dec 10, 2008, 10:31 PM

It's not my site Robert, you have to contact Fredrik.

rgoble · Dec 10, 2008, 10:42 PM

I just emailed Fredrik, I will have to wait and see what he says. Thanks for letting me know about it.

Robert

Dr Kiwi · Dec 11, 2008, 08:28 AM

I'm through all the entered motors.

For some of the motors I tested early on, I did not obtain no-load data... for those I still have, I will, in due time, measure those parameters. For other motors we may have to enter, in the interim, "manufacturer's data" which is a problem since we have no way of knowing how their figures were obtained - hopefully users may be able to contribute measured numbers for some of these. If you don't see a "Dr Kiwi Io data" entry, then you'll know that the Io and Rm are from some other source.

For some motors I did not measure diameter and length [contributions please!] - we could use manufacturers' figures, but these require caution since some include the entire shaft in the "length" measurement (some only give stator length, and some are pure fiction!)... I have consistently used "body" length (end plate to end plate, or front face to rear of bell), since I think that gives the user a better idea of the physical size of the motor.

For shaft size I have simply entered the nominal sizes (2.0mm, 3.0mm, 3.17mm, 4.0mm, 5.0mm) although every shaft is different (usually smaller by a few hundredths of a mm).

Cheers, Phil

fly_boy99 · Dec 11, 2008, 06:06 PM

Great job Phil, this will be an invaluable resource for many folks who come to RCG for answers.

Now one question that comes to mind is watt rating. Are you guys just going to stick with the manufacturers recommendations or go with what people are flying at today?

Again, great job!

CuStOm · Dec 11, 2008, 06:18 PM

The weights on the motors seem to be wrong when compared to Phils spreadsheet.

Look at the Suppo's......

Dec 10, 2008, 11:49 AM	#1
Dr Kiwi Registered User Join Date: May 2003 Location: Chattanooga, Tennessee, United States Posts: 19,922	Motor Data - test bench data for several hundred brushless motors. For many years several of us have been generating and accumulating test stand data for a wide variety of electric RC motors, but the information could only be found, frustratingly scattered, amongst a myriad of threads in RC Groups. Now Robert Goble has taken it upon himself to set up and maintain a webpage which provides a central, searchable source for all the available data: anyone with reliable test data is invited to contribute their information to the cause! [I've never counted them up, but Robert found 245 different motors in my EXCEL Spreadsheet]. http://www.flybrushless.com/ Welcome to FlyBrushless.com Mission Statement: To standardize brushless motor measurements in a comprehensible way, and to provide radio controlled aircraft pilots with a common resource for comparing and choosing the right motor for their applications. At this time, we are obviously still adding to/proof reading the data sets, so bear with us. [Adding in Io data and measurements, I've only got to letter G so far]. Much of the data posted so far is from my own testing [any and all errors are mine alone], but obviously lots of other people will add their data as this site evolves. As far as my own data are concerned let me add a caveat to the way in which parameters such as Io have been measured, and Kv and Rm have been calculated - I run no-load and prop tests on each motor... I measure Io/rpm at several voltages but typically have entered the figure I obtained @ ~10v into this database [manufacturers, if they give you an Io, usually do not state the voltage at which their Io figure was obtained]. I then use a program such as Motocalc or Drive Calc. to calculate Kv and Rm. I cannot see that there can be much argument over Kv (even though there are occasionally great disparities between my figures and those posted by manufacturers - where do they get some of their numbers? - no-load rpm divided by voltage applied is a reliable guide to at least a ballpark figure). For Rm, I find that often my figures differ substantially from those given by manufacturers and distributors - they may be using Rm for one phase (I know Mega does that), or Rm for the motor directly, when, in my case, an ESC has to be in the system. Any suggestions as to obtaining the most accurate figures are welcomed. We hope that this resource proves to be useful. Cheers, Phil Attached Thumbnails 77.3 KB · Views: 2303 Last edited by Dr Kiwi; Dec 10, 2008 at 05:30 PM.

Dec 10, 2008, 12:26 PM	#2
rgoble Registered User Join Date: Sep 2004 Location: Dayton Montgomery, Ohio, United States Posts: 199	If you have any questions or problems with the site please let me know here. Also if you have any ideas for improvements I would be glad to hear them. Thanks, Robert Last edited by rgoble; Dec 10, 2008 at 01:00 PM.

Dec 11, 2008, 08:28 AM	#13
Dr Kiwi Registered User Join Date: May 2003 Location: Chattanooga, Tennessee, United States Posts: 19,922	I'm through all the entered motors. For some of the motors I tested early on, I did not obtain no-load data... for those I still have, I will, in due time, measure those parameters. For other motors we may have to enter, in the interim, "manufacturer's data" which is a problem since we have no way of knowing how their figures were obtained - hopefully users may be able to contribute measured numbers for some of these. If you don't see a "Dr Kiwi Io data" entry, then you'll know that the Io and Rm are from some other source. For some motors I did not measure diameter and length [contributions please!] - we could use manufacturers' figures, but these require caution since some include the entire shaft in the "length" measurement (some only give stator length, and some are pure fiction!)... I have consistently used "body" length (end plate to end plate, or front face to rear of bell), since I think that gives the user a better idea of the physical size of the motor. For shaft size I have simply entered the nominal sizes (2.0mm, 3.0mm, 3.17mm, 4.0mm, 5.0mm) although every shaft is different (usually smaller by a few hundredths of a mm). Cheers, Phil Last edited by Dr Kiwi; Dec 11, 2008 at 05:27 PM.

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Dec 10, 2008, 05:30 PM	#4
CuStOm I steer with my thumbs Join Date: Oct 2007 Location: Hillsboro, OR Posts: 360	Awesome! Thanks for sharing all your hard work! Cheers Keith

Dec 10, 2008, 05:43 PM	#5
olmod Good Better Best quest. Join Date: Apr 2004 Location: Cranbourne Melbourne vic Australia Posts: 7,546	Great only suggestion i can make is to give the vertical columns colours ,as i work my way down i lose whats amps ect. but a worthwhile data base IMHO.

Dec 10, 2008, 09:37 PM	#6
rgoble Registered User Join Date: Sep 2004 Location: Dayton Montgomery, Ohio, United States Posts: 199	Thanks for the suggestion. I added a new header row that shows what the columns are ever 30 rows. That's about one every screen (at least for my resolution) and can be adjusted if needed. I was going to use the column colors as you suggested but I think this might work better. I never realized the full extent of testing Phil did on these motors until I started adding his data to the site. Robert

Dec 10, 2008, 09:40 PM	#7
lake flyer Registered User Join Date: Nov 2005 Location: Stony Lake, Ontario, Canada Posts: 3,776	I registered , but did not get my confirmation email ??

Dec 10, 2008, 09:46 PM	#8
rgoble Registered User Join Date: Sep 2004 Location: Dayton Montgomery, Ohio, United States Posts: 199	I'm not sure what happened there. I sent you a pm to verify your email address and I activated your account. Robert

Dec 10, 2008, 10:16 PM	#9
Ron van Sommeren homo ludens modellisticus Join Date: Feb 2001 Location: near Nijmegen, Netherlands Posts: 8,674	Add these measurements too? www.flyingmodels.org Vriendelijke groeten Ron

Dec 10, 2008, 10:22 PM	#10
rgoble Registered User Join Date: Sep 2004 Location: Dayton Montgomery, Ohio, United States Posts: 199	Is that your site or does it belong to someone else? I don't want to add someone's data with out their permission. Robert

Dec 10, 2008, 10:31 PM	#11
Ron van Sommeren homo ludens modellisticus Join Date: Feb 2001 Location: near Nijmegen, Netherlands Posts: 8,674	It's not my site Robert, you have to contact Fredrik.

Dec 10, 2008, 10:42 PM	#12
rgoble Registered User Join Date: Sep 2004 Location: Dayton Montgomery, Ohio, United States Posts: 199	I just emailed Fredrik, I will have to wait and see what he says. Thanks for letting me know about it. Robert

Dec 11, 2008, 06:06 PM	#14
fly_boy99 Flying motor mount master Join Date: Oct 2004 Location: San Jose, California, United States Posts: 8,457	Great job Phil, this will be an invaluable resource for many folks who come to RCG for answers. Now one question that comes to mind is watt rating. Are you guys just going to stick with the manufacturers recommendations or go with what people are flying at today? Again, great job!

Dec 11, 2008, 06:18 PM	#15
CuStOm I steer with my thumbs Join Date: Oct 2007 Location: Hillsboro, OR Posts: 360	The weights on the motors seem to be wrong when compared to Phils spreadsheet. Look at the Suppo's......