Double rotor stepping motor

A stepping motor comprising:

• a stator comprising N stator contacts, where N is an integer greater than or equal to three,
• a first rotor which is able to move with respect to the stator about an axis, the first rotor comprising a first set of teeth distributed at a first pitch p1, and a second set of teeth distributed at a second pitch p2, and
• a second rotor which is able to move with respect to the first rotor about the axis, the second rotor comprising N rotor contacts,
• the N stator contacts comprising a plurality a of teeth distributed at the pitch p1, where a is an integer, the N stator contacts being distributed on the stator at a third pitch equal to p1(a+1/N), the teeth of the first set being able to be aligned individually with one of the stator contacts, the passage from one alignment to a consecutive alignment causing the first rotor to move in a first direction with respect to the stator by the pitch p1/N,
• the N rotor contacts comprising a plurality b of teeth distributed at the pitch p2, where b is an integer, the N rotor contacts being distributed on the second rotor at a fourth pitch equal to p2(b+1/N) and being able to be aligned individually with one of the teeth of the second set, the passage from one alignment to a consecutive alignment causing the second rotor to move in a second direction, opposite to the first direction, with respect to the first rotor by the pitch p2/N.