Beginners Guide Part 2 - ESC and BEC
ESCESC means Electronic Speed Controller.
Every electric RC vehicle has its power system which consists of motor, ESC and LiPo battery.
First, the ESC gives impulses to the motor without which the motor could not operate. Second, it controls the motor speed, according to the throttle position. Thirdly, it powers the other RC devices in the model (receiver and servos) so that no special battery is needed. Fourth, monitors that the voltage in the LiPo battery does not fall below 3 volts per cell, which would cause problems with the power of other RC components and may even destroy the battery.
ESCs today are a small computers and allows programming of a large number of parameters, ranging from impulse length to minimum battery voltage.
They generally come in 2 versions, with built-in BEC (Battery Eliminating Circuit) for powering the receiver and without the BEC (OPTO ESC).
In addition, two values are important for each ESC.
Maximum continuous current in A and maximum burst current in A that you should not exceed if you do not want to "burn" the ESC. Thus, the ESCs come in values of 5A, 8A, 10A, 25A, 35A, etc., which indicate the maximum continuous current, the maximum burst current usually stands in a bracket eg. 25A (30A burst). Additionally, the maximum voltage at which the ESC can work is also important, usually marked by the number of cells (10-14 NiMH / 2-4S Lipo).
ESC usually has three groups of wires:
- Three wires for the motor
- Two thick wires for the battery
- Three twisted wires for the receiver, similar to cables on servos and other RC devices.