"Bob Engelhardt" wrote in message
...
Is a servo motor simply a DC motor with an encoder or tach? Or is there
something about the motor itself that makes it a "servo motor"?

Thanks,
Bob

A DC servo is just a DC motor with a feedback device. You can make a DC
motor into a servo by adding an encoder. Richard Kinch has a web site
showing his effort.

Now a good DC servo is designed for high torque at low speed without burning
out. A DC motor you pull off the shelf won't be optimized for this.

Karl