Speed controller is a device that regulates the amount of power that goes to the electric motor.
The electronic speed controller also known as ESC interprets signals from the receiver and works to provide variation in motor speed and direction and may act as a braking mechanism. There are electronic speed controls for brushed and brushless motors.
If your RC is not equipped with an electronic speed controller and you want to add one, the general considerations are:
* Brushed or Brushless depending on your motor.
* Current rating that is higher than what your motor can pull (to avoid overheating).
* Voltage rating that is at least equal to or higher than the voltage of your battery.
* Low Voltage Cutoff is a feature on some electronic speed controllers that prevents damage to your battery pack by shutting down the ESC if the battery voltage drops too low.
here is a picture of a brushless ESC electric speed control
The red blue and black wires connect to your brushless motor, the red and black wires with the Deans connector on the tip connect to your battery, and the connector terminal wire plugs into your receiver.