| Forgive my ignorance on "gearboxes".. is this an addition that some | motors have to run?
Gearboxes basically adjust the Kv rating of a motor (well,
motor+gearbox) -- a 2:1 gearbox that slows the motor down by a factor
of two also reduces the Kv rating by a similar amount. They generally
allow you to swing a bigger prop more slowly, which is more efficient.
You can either design the motor to have a lower Kv rating, or use a
gearbox to take a high Kv motor and reduce the value.
In general outrunners have lower Kv values than inrunners, but that's
just a rough rule of thumb and there are many exceptions. It's all in
how things are made ...
| I'm guessing brushless doesnt require this
Brushed and brushless motors obey the same rules, they're just
built differently. Both can use a gearbox or not.
| (actually.. i still dont know the mechanics of what makes a
| brushless , brushless, vs brushed etc).. I'm assuming it has
| something to do with the inner parts
Basically a brushed motor has brushess and a commutator, and a
brushless motor does not -- instead, the ESC does that work.
Brushless motors tend to be somewhat more efficient when you have a
motor that often runs at speeds less than full power. In the case of
models, they tend to be compared to cheap, poorly made can motors and
so they have a reputation of just being a whole lot better -- but if
you compare against good quality brushed motors, the difference
becomes much smaller.
- posted 15 years ago