Motor and ESC, the Power Base of UAV drone - part 2

UAV's main source of power components is motor, in addition to the motor, Electronic Speed Controller, abbreviation ESC, is also very important. Electronic Speed Controller, referred to as ESC, its role is that based on the flight control signal, it changes the battery DC input into a certain frequency AC output, used to control the motor speed.

2. ESC

Brush ESC: Brush ESC is used to control the brush motor speed. Brush ESC usually needs only 4 wires, 2 wires are the input power terminal, received positive and negative. The other two wires are manipulated motor speed output, connected to the motor electrodes. After changing the current / voltage and conduction direction can be completed on the speed and control.

Brushless ESC: Similarly, the brushless esc is the brushless motor speed controller. Brushless ESC input is also 2 wires connected to the positive and negative power supply. However, the output of brushless ESC requires 3 wires. As mentioned above(part 1), this is because brushless motors rely on three wires to constantly change the magnetic field to drive the rotor to roll.

Models of Brushless ESC: There are many types of brushless ESC on the markets now, like the 20a brushless motor, 30a brushless motor, 40a brushless motor, which are quite common. I will list some examples for you so that you will know the differences between these brushless motors in a better and clearer way.

1. FVT LittleBee 20A ESC BLHeli OPTO 2-4S Supports OneShot125 (no BEC)

This 20a esc has 20A Continue Current and 25A Burst Current up to 10S, and its Input Voltage is 2-4S Lipo, which is a small volume, lightweight, fast response, best Mini multi ESC for RC Drone FPV Racing Multi Rotor.

2. XXD HW30A 30A Brushless Motor ESC

This 30a esc brushless motor speed controller has the Power 5.6V - 16.8V input,2A BEC, and 30A Constant current (Max 40A Burst Current less than 10 seconds). It has Safe power function, Throttle Calibration function, Low Voltage Protection function.

3. FMS Predator 40A Brushless ESC With 3A Switch BEC T TX60 Plug

5.5V/3A BEC Switch System can reduce BEC damaged as overload current and the 32 bits high-performance controller can improve running speed. This 40a esc has 45A Continuous operating current, 50A 50Sec Full load operating current and 55A 10Sec Maximum operating current.