Thanks everyone. I'm looking for a reference book that has enough content to learn how to design a motor for a given need. I doubt I ever will get to the point of designing a motor from scratch, but it sure would be helpful to know the limitations of motor designs as it relates to pump design.
Regarding so-called "pump motors"....one thing that doesn't take long to figure out is the motor business is a volume driven business. The motor guys want to produce what they currently make and that's about it. Trying to make a niche product with a standard motor is half-a$$ to be truthful. I would like to be able to help custom motor manufacturers grasp what we are trying to do and it is near impossible to do so with a very basic knowledge of "electricity in, torque out". OF course the basic argument for custom designed motor is volume, but it is pretty damn difficult to get an accurate volume without having a product (or at least a prototype to show and test).
OK, I'm off the soapbox.