Re: servo driver on a chip ?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Anders Wallin
<anders.wallin@...> wrote:

>
>
> > This is called an RC-servo. They are generally plastic boxes with an
> > actuator arm that is driven by a geared DC motor. They are open
> > loop and do not include position feedback within the control loop.
> > The units were initially used in RC-remote controlled aircraft, cars
> > and other models, and are now finding many uses in robotics.
> >
> huh ? normal RC-servos are most definitely closed loop - there's a
> potentiometer that measures where the arm is and the difference between
> the measurement and the command is used to drive the motor.
> Newer RC-servos use digital feedback loops and are very accurate and

strong.

>

The R/C servo is a totally different beast than the motion control
servo that takes step and directon commands.

Dave