ekim1940

I understand kva for brush less motors but what does turns mean for brush motors

sheograth

It means how many turns the armature has.

DaveG55

Also known as windings. The armature windings will determine many things about an electric motors performance. Things like the wire guage and how many wraps (turns, windings) there are will determine motor torque and affect rpm.

Link119

My Feedback: (1)

More turns = less kv and less turns = more kv.

FahrtAutoRC

Not particularly. KV and turns are two different things.

ekim1940

I posted a question about turns . It seems that know one knows either . I understand the more turns means more windings . I ques i should have explained the question better . How do turns relate to rpm , speed . I have a 20 turn motor in a car . I want more speed, so how many turn motor do i need and why ?

nitroexpress

Maybe these calculators will be of help. What battery voltage will you be running? Are you racing or bashing?

http://www.scriptasylum.com/rc_speed/data_motor.html

ekim1940

Thank you

Eman77

In general, more turns (27T vs a 9T) means lower top speed, greater acceleration for brushed motors. Higher turns means higher top speed, but often less acceleration to get there.

Some brushed motors will list the # of winds - ie 19Tx 4 (where 19 is Turns, 4 winds)

Winds is the number of wires used for each winding.

Here's further info I found about it:
"What makes a difference in a motor with winds is the effect that the change in inductance caused by the multiple strands of wire wrapped around each other has on how the current flows into the motor. The higher inductance reduces the initial current spike that gives a motor its start-up torque. The addition of the winds makes the onset of power much smoother and the motor more controllable at the cost of initial acceleration. As the motor spins up the inductance plays a smaller part in the total impedance of the motor and the max RPM ends up being quite similar between motors with the same number of turns but different winds since the total cross sectional area of the wire in the motor windings is very close to the same. The higher winds gets slightly better run time under race conditions because the initial current spike on throttle application is reduced. "

sheograth

Fewer turns means lower overall impedance and more current, and that makes the motor run faster. More turns increases impedance and less current flows, which makes the motor run slower but with greater torque.

Eman77

Right.