Variable speed motors do not necessary have the hall effect probes. The electronics in the ESC pulses the motor to tell it is initial direction and some other feed back system humans using RC or an autopilot reading accelerometers or gyros adjusts the speed.
RC servos are used to provide actuation for various mechanical systems such as the steering of a car, the control surfaces on a plane, or the rudder of a boat. Due to their affordability, reliability, and simplicity of control by microprocessors, they are often used in small-scale robotics applications. A standard RC receiver (or a microcontroller) sends pulse-width modulation (PWM) signals to the servo. The electronics inside the servo translate the width of the pulse into a position. When the servo is commanded to rotate, the motor is powered until the potentiometer reaches the value corresponding to the commanded position.
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