Patent ID: 8872395
Filing Date: 2014-10-28
Classification: H02K

Abstract:
1. A rotary single-phase electromagnetic actuator comprising: two stators with at least one of those stators being an active stator for generating a magnetic field, the active stator having a stator structure with two stator poles having two opposed inner parallel flat surfaces extending to a base and said other stator having two stator poles extending to a base, said two stator poles configured for single-phase activation, the two stators being axially spaced apart a predetermined distance defining an airgap with a dimension (E); wherein said two stator poles of said active stator are spaced apart a radial distance (D) separating said two opposed inner parallel flat surfaces along a direction perpendicular to said parallel flat surfaces such that a ratio of D to E (D/E) is in a range of 4 to 5; an inertia assembly comprising: the rotor being in the airgap and spaced from each stator by a predetermined distance; wherein the two stators are configured and positioned relative to one another so as to establish, when said at least one active stator is energized, a closed-loop magnetic flux circuit that flows between the two stators through the stator poles, said base of the active stator, said base of the other stator and the rotor, and wherein the interaction between the rotor's magnetic field and the magnetic fields of said stators is capable of generating a torque delivered to the shaft so as to produce an angular stroke of equal to or less than 180 degrees.