The 3212 is a standard servo that has been built by SpringRC specifically
for continuous rotation (up to 60 RPM at 4.8 V), and it produces a
lot of torque (13 kg-cm at 4.8 V). It features two ball bearings on
the output shaft for reduced friction, and it offers easy access to
the rest-point adjustment potentiometer. Essentially, it is a gear
motor that can be controlled by an RC servo controller. It is not
normally used as an actuator, as there is no way of commanding it
to move to a particular position, as a standard RC servo does.
The 3212 continuous rotation servo converts RC servo position pulses
into continuous rotation speed. The default rest point is 1.5 ms,
but this can be adjusted by using a small slotted screwdriver to turn
the middle-point positioner (see the Mechanical Drawing). Pulse widths
above the rest point result in counterclockwise rotation, with speed
increasing as the pulse width increases; pulse widths below the rest
point result in clockwise rotation, with speed increasing as the pulse
width decreases.
Normal servos can be adapted to continuous rotation use, but the problem
is that the range of positions that result in the motor being stopped
or operating at less than maximum speed is very narrow. Continuous
rotation servos, depending on the position commanded, can go forward
or reverse at different speeds. With an adapted continuous rotation
servo, the position range for the different speeds is very narrow,
making it difficult to produce a specific speed.
These dedicated continuous rotation servos are superior because they
have a very wide ˇ§deadbandˇ¨ so you can be sure the motor is stopped
when you command it, and the position range for forward or reverse
motion is very wide, giving lots of speed resolution.
Accessories Bag:
Mechanical Drawing:
A |
B |
C |
D |
E |
42.0mm |
20.5mm |
39.5mm |
49.0 |
10.0mm |
Warning
|
RC servos are hobbyist remote control servos typically
used in radio-controlled models, where they provide actuation
for various mechanical systems such as the steering of a car,
the flaps on a plane, or the rudder of a boat. These servos are
not industrial grade and are not recommended for continuous heavy
use. |
Controllers:
This Servo can be used with the following Phidget
motor controllers:
1066 - PhidgetAdvancedServo 1-Motor
1061 - PhidgetAdvancedServo 8-Motor
The 1061 will produce a little more torque than the 1066. When connecting
the servo motor to the motor controller, make sure that the cable wires
line up with the proper colors as marked on the conroller board.
|