Patent ID: 7176590

Claim:
A spiral linear motor, comprising: a rotator including a center shaft having an axis and a spiral-shaped portion protruding in the radial direction, provided on the outer circumference of the center shaft; and a stator comprising hollow magnetic poles forming a center space having a spiral-shaped groove with the same pitch as the rotator, wherein the center shaft of the rotator is within the hollow magnetic poles forming a center space of the stator; the side face of the spiral-shaped portion of the rotator in the axial direction and the side face of the spiral-shaped groove of the stator in the axial direction are opposed to each other in a direction parallel with the axis of the center shaft; the spiral-shaped portion is rotatable in a spiral shape within the spiral-shaped groove of the hollow magnetic poles forming a center space; and the rotator moves linearly in the axial direction while rotating in a spiral shape with respect to the stator.