The power distribution system, distributes the electrical power to the components of our FPV racing quadcopter. In the case of our racer it is a very simple system consisting of a distribution board, four ESCs (electronic speed controllers), a battery connection and of course a battery at final assembly (below photo).
There are a few very important things to note when putting together the power system. An important concern is polarity (+,-). We want to make certain that all positive (red) connections and all negative (black) connections are correct. IMPORTANT: If there is a mistake in polarity, the battery itself may explode when connected causing personal injury as well as damaging the other electrical components. The other thing to take notice of is the relationship of the front of the quadcopter and the position of the ESCs, since the ESCs themselves will be secured out on the arms of the racer. In the above photo we can see that the front of the board is labelled. The front being the relative position when the board is installed in our racer, the board itself does not have a front and back. Then, the ESCs are soldered to the side terminals of the board keeping in mind their relative position when mounted in the racer. Thirdly, the power leads and battery connection are soldered to the rear terminals since we will be passing the battery connection through the modified cutouts in the frame plates which is to the rear of the aircraft. In addition to the battery connection, we have added an extra set of positive/negative wires in case we want to power some other components in the future. By adding these leads now we won't have to take the entire thing apart later on. Just be sure to add some heat shrink tubing to the ends of these extra wires in such a way that no bare wires are exposed!
When all the soldering is complete, we are going to mark both the ESCs and the ESC flight controller module connections to make assembly much, much easier in the next few steps (above photos). Be sure to do this to all four ESCs marking them 1 through to 4.