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-   -   Difference between 2826-1000 and 2212-1000 motors (https://www.wattflyer.com/forums/showthread.php?t=80265)

trying2fly 08-13-2019 09:45 PM

Difference between 2826-1000 and 2212-1000 motors
 
I need the understanding of the difference between a 2212-1000 Kvp motor and a 2826-1000 Kvp. Are they interchangeable ? Do they have comparative power? I was told that there was not significant difference in the 2212-2200 Kvp and a 2826-2200 Kvp. I was wondering if the same was true with the 1000 Kvp motors? thx

Jools 08-14-2019 12:51 AM

I think there could be quite a difference in those motors, the motor diameter and lengths are very different. Check the motor specs, particularly the max amps figure. You'll probably find that the 2826 can 'pull' quite a bit higher Amps. Higher Amps will allow you to use a bigger prop to give much more power.
Get yourself a wattmeter (they're cheap nowadays), which will allow you to measure watts and amps to test and compare motors and find the optimum prop etc.

crxmanpat 08-14-2019 01:09 AM

Motor numbers have gotten confusing between the different brands. If I recall correctly from my pusher prop days, the 2212 (Suppo) and 2826 (HK) motors are the same. So a 1000kv of one will be the same as a 1000kv of the other. I used to fly the Suppo 2212-2200kv in my pusher jets, then got a couple 2826-2200's from Hobby King, and they were the same.

Jools 08-14-2019 01:25 AM

I stand corrected. I've used many motors over the years but haven't encountered such differences in quoted motor sizes for the same output.

trying2fly 08-14-2019 01:58 AM

I have just noticed on Ebay that a 2212 - 1000 can be purchased for under 6.00 while most 2826-1000 are about 10.00 to 15.00 dollars and even higher. I just wanted to be sure the cheaper motors were at least within 10-15% of the power that the more expensive motors produced.

crxmanpat 08-14-2019 05:02 AM

I see a wide range of prices just by doing a Google search for 2212 1000kv. For peace of mind, I'd suggest any listing that shows the brand name Suppo. I used those motors for years without issue.

solentlife 08-14-2019 12:43 PM

The reason for the different numbers is how the measurements are made.

The 2826 is based on the EXTERNAL case size ...

The 2212 is based on the internal stator size.

The two are same as long as weight and KV are quoted and seen as same.

trying2fly 08-14-2019 04:18 PM

Thank you very much for the information!!

ron_van_sommeren 08-15-2019 03:04 PM


Originally Posted by trying2fly (Post 1020206)
I need the understanding of the difference between a 2212 - Kv=1000rpm/volt motor and a 2826-Kv=1000rpm/volt. ...

Conservative rule of thumb for a motor's max.power: 3-4 watt per gram motormass. A safe starting point.


Originally Posted by trying2fly (Post 1020206)
... Do they have comparative power? ... ... I was wondering if the same was true with the Kv=1000rpm/volt motors? ..

Note that Kv says absolutely nothing about max.power or max. current a motor can handle, or about max. torque, or rpm. A 1:1 train motor and the motor in your toothbrush or in a bedroom appliance can have the same Kv of 1000rpm per volt.

It's all about what the motor wants to do versus what the motor can do.
Kv matches rpm and voltage, there's nothing more to it.
  1. Kv and voltage determine how fast motor wants/tries to run
    (rpm_noload = voltage Kv).
  2. Rpm and prop determine torque, which in turn determines current
    (current = torque Kv, in SI units!).
  3. Max.current and power determine whether that battery/motor/rpm/prop combo can run without going up in smoke.
An engine tries to keep a constant torque: as load goes up, rpm goes down.
An e-motor tries to keep a constant rpm: as load goes up, current goes up.

ron_van_sommeren 08-15-2019 03:20 PM


Originally Posted by Jools (Post 1020208)
... Get yourself a wattmeter (they're cheap nowadays), which will allow you to measure watts and amps to test and compare motors and find the optimum prop etc.

Ir will pay for itself, several times over.

Without a watt-meter you are in the dark.
Until something starts to glow https://static.rcgroups.net/forums/i...lies/frown.gif https://static.rcgroups.net/forums/i...ilies/wink.gif

trying2fly 08-15-2019 06:07 PM

Thanh You!!

ron_van_sommeren 08-16-2019 01:28 AM


Originally Posted by ron_van_sommeren (Post 1020255)
... Note that Kv says absolutely nothing about max.power or max. current a motor can handle ...

On the other hand, Kv has a huge effect on current a motor (tries to) draws, current is proportional to Kv cubed (and proportional to voltage squared).

E.g. doubling Kv would 2=8fold current, that is, if battery, controller and motor can handle it without going up in smoke. And ignoring the extra voltage losses.
A more real life example: going from Kv =1000rpm/volt to 1250rpm/volt (or any increase by factor 1.25) would give an increase in current drawn by factor (1.25)=2!



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