QUOTE(dudester @ Jul 15 2019, 10:15 AM)
From what i gathered here, Sliding DC motor seems to be more problem them AC.
why do i need DC motor for?
I am okay with my 8 year+ Italy motor, i doubt it has DC. Only problem is I can never find replacement parts, even the mother board has been changed to local board. Limiter spring switch has no replacement parts.
1) Appreciate DC vs AC differences.
2) Prefer a Motor using magnetic Limiter rather then spring.
Well everyone has a different view on AC and DC motor.
I'm been selling DC Motor driven since 2001. No issue just wear n tear as normal it can be. Lasting somewhere 8 to 15 years for my customer before going into a new unit.
1) AC runs on 220-250volts and it turns slower around 800rpm which you'll notice your gate operate at much slower speed. has higher torque output. doesn't have backup battery operate option as is impossible to drive a 240v motor from a DC12v battery. Dangerous if the motor cover is expose as there is 240 Volts live. Usually last longer than DC motor as it runs on magnetic coil field to generate the amateur to turn.
DC on the other hand operate some where 12v to 24v for carbon brushed motor while the newest technology DC Brushless motor can operate up to 36V. It turns around 3000rpm to 5000rpm which makes the gate opening/closing much quicker. It may have lower torque than AC motor but years goes by, DC Motor can as much torque output as AC does. DC motor can run on battery backup. DC operating at such low voltage, is safer than 240v does. Only cons of DC Motor is the wear n tear of the carbon brush and amateur due to friction which easily last 8-15 years depending operating environment. While the DC Brushless version can go as long as AC motor does cause there is no carbon brush for friction to operate, all done completely via magnetic field. DC Brushless motor can operate at much faster speed and speed reduction curve is so butter smooth that you don't notice a sudden jerk when it slows down.
2) mostly AC motor uses spring type limit switch due the AC magnetic field so strong that it effects the magnetic switch inside the motor compartment. Cause mostly AC motor locally or china ones have poor magnetic shielding.