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Oct 14, 2009, 04:25 PM
Registered User
Discussion

Motor numbers


How can I decipher all of the different numbers associated with electric motors?
Ex.: CF2805
2409-18T
2836-11
2836-22
4248-06
It seems like there is some reasoning behind the numbering system but I can't figure it out!
Joe
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Oct 14, 2009, 04:38 PM
Registered User
Ken Myers's Avatar
While the motor numbers usually have some significance for the manufacturer, different manufacturers use different numbers.

The two most significant numbers when comparing motors, and I assume that is what you might want to do, is motor weight and Kv, even if you don't know what Kv means.
Oct 14, 2009, 05:11 PM
Suspended Account
In those examples, the first number is the motor's diameter. The second number is the length. The last number is the Kv rating. IE 12 = 1,200 kv. That's the motor constant.

IE: 2836-11
Diameter: 28mm
Length: 36mm
Kv: 1,100

Typically, the numbers thatare missing (for me) are the Max Amp draw which is really what you need to know to keep from smoking your motor and the motor weight.

Not all manufacturers use this numbering format. But it does help a little when they do.
Oct 14, 2009, 05:46 PM
Team Hitec, Customer Support
Xpress..'s Avatar
^Well, the most important numbers would be Kv, Diameter, and MAX amps. From there, you can select a motor for a specific plane
Oct 14, 2009, 09:01 PM
Registered User
You need to know max amps and max volts as well. Alternatively you need to know max watts, but there is no standard for any of these measurements -- some manufacturers will give a conservative value, and others will inflate their numbers.

A "peak" power rating is of limited value. What really matters is the continuous power rating.

A general rule of thumb is 100 watts per ounce of motor weight. And if anyone knows of significant deviations from that rule, I'd be interested.
Oct 14, 2009, 09:14 PM
Slow Flyer
Bombay's Avatar
Quote:
Originally Posted by HappyKillmore
In those examples, the first number is the motor's diameter. The second number is the length. The last number is the Kv rating. IE 12 = 1,200 kv. That's the motor constant.

IE: 2836-11
Diameter: 28mm
Length: 36mm
Kv: 1,100

Typically, the numbers thatare missing (for me) are the Max Amp draw which is really what you need to know to keep from smoking your motor and the motor weight.

Not all manufacturers use this numbering format. But it does help a little when they do.
I don't believe those numbers represent the same thing for every motor type or manufacturer. For instance...

What does 2212-6 mean?
Size: 27.8 mm x 31 mm
Kv: 2200 RPM/V

What does 2212-13 mean?
Dimensions: 28mm x 30mm
Kv: 1000
Oct 14, 2009, 10:23 PM
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Mayday!Mayday!'s Avatar
Another example is Mega motors. Thet don't use the outside dia/length/turn.

They use the inside rotor #'s like this--
ACn16/15/3 is a 16mm diameter rotor X 15mm length rotor with three turns of wire per pole
Oct 14, 2009, 10:29 PM
Promoting Model Aviation...
Murocflyer's Avatar
This is another non-standard in the industry. Just like balancing taps on batteries.

Sure wish companies would have standardized this for us.

Frank
Oct 14, 2009, 10:30 PM
Registered User

Motor Grams


What does it mean when the motors are referred to in "grams" Like one post I saw said "don't use larger than a 20 gram motor".
Oct 14, 2009, 10:33 PM
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Mayday!Mayday!'s Avatar
It means don't use a motor that weighs more than 20 grams or 0.70 ounces
Oct 15, 2009, 07:01 AM
Registered User
Ken Myers's Avatar
Quote:
Originally Posted by HappyKillmore
In those examples, the first number is the motor's diameter. The second number is the length. The last number is the Kv rating. IE 12 = 1,200 kv. That's the motor constant.

IE: 2836-11
Diameter: 28mm
Length: 36mm
Kv: 1,100

Typically, the numbers thatare missing (for me) are the Max Amp draw which is really what you need to know to keep from smoking your motor and the motor weight.

Not all manufacturers use this numbering format. But it does help a little when they do.
Sorry Happy, your description is incorrect for most motors, and shows why the "numbers" by themselves mean very little.

When you see numbers after the - (dash) as in your example that are one or two digits it is the number of turns.
So someone's 2836-11 would indicate an 11-turn motor and a 2836-6 would be a six turn.
Some other manufacture might have a 2830-850 or 2830-1100. If it is a three or four digit number following the size designation (which varies by manufacturer) it is the Kv.
Last edited by Ken Myers; Oct 15, 2009 at 07:12 AM.
Oct 15, 2009, 05:19 PM
Team Hitec, Customer Support
Xpress..'s Avatar
For seeing what the numbers mean, a good manufacturer will give you a guide, like ElectriFly, or Himax motors
Oct 16, 2009, 12:47 PM
Suspended Account
As near as I can tell this 2212-6 is using it's own crazy numbering system (which is not really that suprising). Maybe it's 22 for 2,200 kv, 12 for 12V? and 6 for 6 turns?

http://cgi.ebay.com/ws/eBayISAPI.dll...m=110419964998

EDIT: Nope, this doesn't follow

http://cgi.ebay.com/RC-1500KV-Outrun...item1c0d326b59

There is no rhyme or reason to this mfg's numbering system.

EDIT2: Here's one that is diameter, length, # turns

http://cgi.ebay.com/RC-750KV-Outrunn...item1c0d38384a


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