Importance

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Abstract

A can body maker wherein the redraw sleeve is provided with an plurality of air escape openings to provide for the passage of air as the ram moves through the redraw sleeve and wherein the redraw sleeve is attached to the armature of a linear motor which includes a generally cylindrical armature which moves within a surrounding, coaxial stator. The armature includes a plurality of axially spaced apart armature salient pole rings separated by permanent magnet rings. The stator includes a plurality of axially spaced apart stator salient poles which each form a ring radially spaced from and surrounding a portion of the armature. The axial spacing between adjacent stator salient pole rings is one-third greater than the axial spacing between the armature salient pole rings, and an electromagnetic coil extends circumferentially within the stator around the armature between each stator salient pole ring. At least six such electromagnetic coils are provided, and are connected in three primary pairs wherein each pair of electromagnetic coils has a 120 degree current phase difference with respect to the other two primary pairs of electromagnetic coils, when energized. The at least six electromagnetic coils are all energized continuously with sinusoidally varying currents to generate a translating magnetic field wave which utilizes reluctance forces between the armature salient pole rings and the stator salient pole rings to produce translatory motion of the armature relative to the stator.

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First Claim