Can someone explain motor ratings? - RC Groups
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Jan 12, 2013, 04:21 PM
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ripmax's Avatar

Can someone explain motor ratings?

I understand kv, amps etc, but what does it mean when a motor is listed as 2826, 3025, 2836.........what do those numbers denote??

Thanks anyone!
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Jan 12, 2013, 04:24 PM
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Mortimer's Avatar
It's stator's diameter and length.
2826 = Diameter 28mm, length = 26mm
Last edited by Mortimer; Jan 12, 2013 at 04:29 PM.
Jan 12, 2013, 10:30 PM
Registered User
Also, Some older plans show "speed-300-motor" OR "Speed-400-motor"
how do I find the best brushless equivalent - Is there a conversion chart or something?

Jan 13, 2013, 04:45 AM
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ripmax's Avatar
Originally Posted by Mortimer
It's stator's diameter and length.
2826 = Diameter 28mm, length = 26mm
Thanks, its been bugging me for a while now!
Jan 13, 2013, 08:06 PM
Suspended Account
It is not always stator size although that is the most common. Some manufactures such as Leopard use the overall motor dimensions which can get confusing and hard to compare to other brands.
Jan 15, 2013, 09:28 AM
Registered User
Only the last two digits are sure, the length of stator or magnets.
The first two digits you can't bet without an explicit specification from the manufacturer, it can be external bell diameter as well as internal stator diameter.
2212 for example I am pretty sure means 22mm stator diameter, because I know these motors, but otherwise... what is more confusing is the fact that the same manufacturer can label the same motor as 2212 or 2830... the later being the external bell dimensions.
There are several classes, quite well standardized:
- 22mm stator = 28mm external diameter
- 28mm stator = 35mm external diameter
- 35mm stator = 42mm external diameter

As you can see, one class external diameter size is the internal stator size for the next class.

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