Frameless Motor

Seems interesting for integrating into the pump housing. Looks to be stiffer, lower cost, and good on delivering the high torque.

http://blog.parker.com/what-you-should-know-about-frameless-motors

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Frameless Motor

Ortman Key

A low-profile method for joining two concentric cylinders. It has a low part count, and is fairly simple, but the undercuts are annoying from a DFM standpoint.

From aerocon systems.

Patent: https://www.google.com/patents/US3027631

Ortman Key