Could someone fill me in on different pumps and how they work?
 

I remember magdrive pumps use AC current to pull an impellor thats "floating" on a magnetic field.

What about DC pumps? Do they have a DC motor hooked up to an impellor sort of like a fan motor + blades?

Why are they so much less dependable then even inexpensive AC pumps?

Are there other types of pumps?

Thanks. I'm trying to do a quick writeup on pumps and I don't want to generalize incorrectly about different pumps.

There's some good reading here:
http://www.tpub.com/fluid/ch1p.htm

I always found the following link to be an excellent place to start:

The Internet Glossary Of Pumps

Thanks for that link ,Cathar.... everything you ever wanted to know about pumps ,but were afraid to ask.