A claw-pole type stepping motor comprises: a rotor assembly shaped substantially cylindrical, and having a center shaft; and a stator assembly composed of two cup-shaped stator units which are coupled to each other coaxially so as to axially sandwich the rotor assembly, and which each include a bobbin...http://www.google.com.au/patents/US7071593?utm_source=gb-gplus-sharePatent US7071593 - Claw-pole type stepping motor
