ELECTROMAGNETIC DRIVE Russian patent published in 1995 - IPC

FIELD: high-speed electromagnetic drives of fuel injectors. SUBSTANCE: electromagnetic drive has armature 1 with poles 3 in the form of internal projections and stator 2 arranged concentrically inside armature and provided with mating poles 4 in the form of external projections with end surfaces, with axial clearance 5 with respect to mating end surfaces of armature poles on side unidirectional with armature effective travel. Windings 6 placed between poles 4 of stator 2 form, together with the latter, alternating-polarity elementary electromagnets for longitudinal displacement of armature 1 relative to stator 2. Projections of pole 4 of stator 2 on plane perpendicular to drive axis partially cover projections of poles 3 of armature 1 on same plane. Armature is split longitudinal and has at least two parts joined together. EFFECT: improved design. 11 cl, 23 dwg