Patent ID: 7719155

Claim:
A two-phase synchronous electric motor, comprising: a permanent-magnet rotor, rotating around a respective rotation axis; a core lamination-pack stator; and first and second pairs of pole pieces defining a housing/rotation seat for said rotors, wherein each pole piece comprises a core, having an end associated to said core lamination pack, a free end portion facing said rotor housing/rotation seat, and a coil on a respective support wedged on said core, wherein at least said free end portion of the core of each pole piece comprises a core lamination pack extending in respective planes being parallel or passing through said rotation axis of the permanent-magnet rotor, said core laminations having a variable length to form a surface of said free end portion of the core of each pole piece being concave in the axial direction and partially wrapping said rotor, wherein the core of each pole piece is removably associated by pin-fitting to the core lamination pack of the stator, an end of the core being inserted in an indent cut in the core lamination pack of the stator and held therein by an elastic pin, said elastic pin being wedgedly inserted between the end of the core and an indent cut in the core lamination pack stator, and wherein the motor comprises a coupling between the rotor and a load by means of at least one motion transmission joint comprising a driving element and a driven element being associated in a kinematic series.