Introduced in 2012, the Servo motor is designed for steering
systems. It can’t rotate continuously—instead, it rotates
90 degrees clockwise or counterclockwise from its central
position. Its low speed allows it to be used with most steering
systems directly, with no gearing in between, while its
huge torque makes sure it won’t be easily stalled.
When used with a basic PF remote, the Servo motor
rotates 90 degrees in one direction or the other when
the remote’s lever is pushed, and it returns to the central
position when the lever is released. When used with the
speed control PF remote or directly with the rechargeable
PF battery, the motor follows the rotation of the speed dial,
meaning that it provides proportional steering with 7 steps
in either direction and 1 neutral position (which it returns to
after the remote’s stop button is pressed). In other words, it
uses the PF speed control feature to break its 180 degrees
of total rotation range into 15 steps, 12 degrees each, while
its speed remains constant at all times.
This motor measures 3×5×7 studs, and it has a bulge
on its bottom with a 1-stud-deep axle hole on the front
and another on the back. Thus, the motor can be inserted
between two axles; it will keep them 1 stud apart and rotate
them as one in the same direction. It also has an integral
wire and can be mounted from the front or from two of its
sides using pin holes.