Old 08-15-2019, 02:04 PM
homo ludens modelisticus
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Join Date: Jul 2005
Location: near Nijmegen, Nederland
Posts: 1,202

Originally Posted by trying2fly View Post
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 View Post
... 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.

Last edited by ron_van_sommeren; 08-16-2019 at 11:10 PM.
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