Patent ID: 7279813
Filing Date: 2007-10-09
Classification: H02K

Abstract:
1. A Z-θ table, comprising: a bed linearly displaceable along a Z-axis and angularly positionable; two rotary motors arranged substantially concentric and providing an internal motor and an external motor, the internal motor including a fixed central stator and a first rotor arranged on an exterior of the central stator, the external motor having a fixed peripheral stator and a second rotor arranged within the peripheral stator, a first one of (a) the first rotor and (b) the second rotor including a first threaded cylindrical portion, a second one of (a) the first rotor and (b) the second rotor including a linear guide device along the Z-axis; and an intermediary piece supporting the bed and including a second threaded cylindrical portion and a slide device associated with the guide device to provide linear displacement of the intermediary piece along the Z-axis, the first cylindrical portion and the second cylindrical portions together forming a ball-screw system.