Oct 14, 2009, 03:25 PM Registered User East Texas Joined Nov 2008 695 Posts 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, 03:38 PM Registered User Commerce Township, MI Joined Aug 2001 5,233 Posts 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, 04:11 PM Suspended Account Brunswick, OH Joined Nov 2005 5,547 Posts 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, 04:46 PM Team Hitec, Customer Support United States, CA, Poway Joined Oct 2007 23,217 Posts ^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, 08:01 PM Registered User Joined Jan 2009 7,643 Posts 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, 08:14 PM
Slow Flyer
Richmond, TX
Joined Apr 2008
3,251 Posts
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, 09:23 PM Check my blog-updated Columbus,Ohio Joined Nov 2005 2,133 Posts 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, 09:29 PM Promoting Model Aviation... United States, CA, Tehachapi Joined Nov 2005 25,507 Posts 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, 09:30 PM Registered User East Texas Joined Nov 2008 695 Posts 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, 09:33 PM Check my blog-updated Columbus,Ohio Joined Nov 2005 2,133 Posts It means don't use a motor that weighs more than 20 grams or 0.70 ounces
Oct 15, 2009, 06:01 AM
Registered User
Commerce Township, MI
Joined Aug 2001
5,233 Posts
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 06:12 AM.
 Oct 15, 2009, 04:19 PM Team Hitec, Customer Support United States, CA, Poway Joined Oct 2007 23,217 Posts For seeing what the numbers mean, a good manufacturer will give you a guide, like ElectriFly, or Himax motors
 Oct 16, 2009, 11:47 AM Suspended Account Brunswick, OH Joined Nov 2005 5,547 Posts 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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