Parts of a garage door opener system
Springs
Most garage doors have either torsion or extension spring systems. However, many tend to prefer torsion springs due to their superior quality and long-term performance. Torsion springs are large springs mounted at the top of the garage door, and they open and close the door in a controlled motion. Meanwhile, extension springs can be found on either side of a garage door.
Motor Unit
The motor unit is one of the most complex parts of the garage door system, and it does a lot of heavy lifting in its operation. The motor unit receives the signal to open or close the garage door, raises or lowers the door, and interacts with the sensors to confirm that it is safe to operate. The motor has settings that let you change the force and distance in which your garage door opens.
Safety Sensors
The safety sensors ensure that nothing is blocking your garage door from closing, and this can be important to prevent anything from being trapped under the door. The sensors are mounted on either side of the garage door, just above ground level, and they are made up of two parts. One sends out a signal, and the other receives it.