Nanomotion, Ronkonkoma, NY, has
released the ST-HR-STD miniature piezoelectric motor for linear
and rotary drives that is suitable for small stepping and continuous
travel. It can make step increments in the tens of nanometers, and
can operate at speeds to 250mm/sec. It measures just 22.8 mm long
by 22.8 mm wide, and is 6.1 mm high. The motor uses the piezoelectric
effect in piezoceramics, which converts electrical field to mechanical
strain. Under special electrical excitation drive and ceramic geometry
of the motor, longitudinal extension and transverse bending oscillation
modes are excited at close frequency proximity, which creates a
small elliptical trajectory of the ceramic edge. By coupling the
ceramic edge to a stage, a driving force is exerted on the stage,
causing movement. When the driving voltage is not applied, the ceramic
plate is stationary and generates holding torque on the stage, which
does not cause any position shift.
Resources:
|
