Motor and ESC, the Power Base of UAV drone - part 3

On the last part, we talked about different brushless ESC models and show you the differences between three brushless ESC models. I guess you have noticed the differences like the current and the voltage, and you also noticed there is a parameter called BEC. Do you know about the BEC? If you are curious about it, keep reading the part 3 which is the last part of this series.

3. BEC

In addition to the motor, the receiver, flight controller, steering gear and others of the brushless quadcopter all need power supply, and most of them need the 5-6V working voltage, while the model battery voltage is 7.4V (2S) above, directly connect such high voltage to the receiver will certainly burn it, so we need to drop the battery voltage to about 5V. Since the ESC is connected to the battery, it is better to integrate the buck regulator function into the ESC, which is called Battery Eliminate Circuit (BEC). The esc speed controller with BEC can directly supply power to the receiver and so on.

UAV drone now commonly use two categories ESC, one is with BEC ESC, one is OPTO without BEC photoelectric switch. As mentioned above, BEC has the ability to split power supply, the power battery voltage can be changed to 5V voltage, to supply power to the flight controller. If the flight controller does not use ESC with BEC, you need to install a separate power supply for it( or use a UBEC).

Note

You can also use a Servo Tester Server Electronic Speed Controller which is a test device and can easily detect the clearance, jitter, and median of all kinds of Servo (server). It can easily connect the ESC and test the working status of the ESC or Motor to make sure they are operating normally. It can connect three sets of servos or ESCs at the same time, using SCM to control with good stability and high accuracy. The ESC built-in BEC or UBEC will provide power to the servo tester. When you use the ESC with built-in BEC, no additional power supply will be needed, just connect the servo or ESC that you want to test to begin testing.