摘要 |
An inertial positioning device comprising: a base plate ( 10 ); a top plate ( 20 ) for mounting an element to be rotated; a rotation member ( 16 ) having a column ( 18 ) on which the top plate is mounted in frictional engagement for slip-stick rotational motion; and a pair of piezoelectric actuators ( 12 ) each secured to the base plate at one end and to lateral extensions ( 17 ) of the rotation member at their other ends. Simultaneous actuation of the piezoelectric actuators rotates the column of the rotation member about its axis. When a suitable asymmetric drive signal is supplied to the piezoelectric actuators, the top plate is rotated by slip-stick motion. The device is compact, has a good load capacity for an inertial motor and is operable in extreme environments such as liquid helium temperatures, high vacuum and high magnetic fields. |