SUGGEST A MOTOR

I'm planning to build an automatic swing gate opener.

Suggest a motor which i can use for the swing gate. 3 to 4 kg max open weight.

What is a swing gate? A diagram of the proposed device would be a big help - include dimensions. See this Simple Image Guide

How do you envisage connecting the motor to the gate?

How quickly does the gate need to open or close? More speed requires more power.

How will the motor be powered?

...R

excuseimanewbie:
I'm planning to build an automatic swing gate opener.

Suggest a motor which i can use for the swing gate. 3 to 4 kg max open weight.

Why don't you suggest the power you will use for the motor?

Paul

Outdoors? Then weather protection is more important than the motor power. Get one that is specifically designed for this task. It won't be cheap.

How far is this gate from the power source? What is your power source?

If it's just a demo project and you aren't serious about weather protection, you can use a 12V 600mA 2 rpm worm gear high torque (10 kg-cm) DC motor like this

Was this the earlier query about using servos to open a gate ? Have you googled gate openers to get an idea about driving systems ?

What about a car windscreen motor and gearbox ?