Patent ID: 7429808

Claim:
Electromagnetic linear motor of the traveling field type, with a magnetic coil arrangement ( 4 ) and a permanent magnet ( 3 ) linearly movable relative to said magnetic coil arrangement ( 4 ), the magnetic coil arrangement ( 4 ) comprising at least three magnetic coils ( 4 a , 4 b , 4 c ) configured and disposed to generate a traveling wave magnetic field for moving the permanent magnet ( 3 ) with positional precision, the magnetic coils ( 4 a , 4 b , 4 c ) comprising closed windings of conductive wire around a longitudinally extended cavity and the permanent magnet ( 3 ) being axially polarized and guided longitudinally displaceably inside the cavity, characterized by a sliding sleeve ( 2 ) guided axially displaceably inside the outer sheath ( 1 ) and enclosing an interior space in which the permanent magnet ( 3 ) is disposed, wherein an outer surface of the sliding sleeve ( 2 ) and at least one portion of the inner wall surface of the outer sheath form sliding surfaces that co-operate as a sliding bearing.