Physical difference between a stepper,servo and a DC motor

[ynneb]

I am looking to make up a collection of informative artical about the difference between a servo, a stepper, and a regular DC motor.

I wish to include many diagrams and pictures. I wish to make the articals in very laymans terms, but still have usefull information.

Once I have collected the information I will post the lot in the technical articals section.

If any one has good pictures, drawings or articals that relate to this topic it would be appreciated if you could upload them to this thread. I will sort them and repost them in the technical section.

I feel that such an artical will answer many regular questions in one easy to find section.

Thanks Ben

Here is an example of the type of pictures I need.

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[keithorr]

http://www.mae.ncsu.edu/courses/mae7.../00_motors.pdf