Motor User Manual
Motor Operation
Nanomotion Ltd.
13
3 Motor Operation
Operation Principle of EDGE & EDGE-4X
3.1
Motors
The Piezoelectric effect in piezo materials converts an electrical field into
mechanical strain. Under special electrical excitation drive and specific geometry
of Nanomotion motors, longitudinal extension and transverse bending oscillation
modes are excited simultaneously at a single frequency. The simultaneous
excitation of the longitudinal extension mode and the transverse bending mode
creates a small elliptical trajectory of the ceramic tip, thus achieving the dual
mode standing wave motor patented by Nanomotion. By coupling the ceramic tip
to a precision stage, a resultant driving force is exerted on the stage, causing
stage movement. The periodic nature of the driving force at frequencies much
higher than the mechanical resonance of the stage allows continuous smooth
motion for unlimited travel, while maintaining high resolution and positioning
accuracy typical of piezoelectric devices. Motion can be linear or rotary,
depending on the coupling mechanism.
Driving Modes
3.2
The EDGE & EDGE-4X motors can be driven by a custom NM ASIC driver, or
alternatively by an XCD and XCD2 EDGE & EDGE-4X Driver-Controller (refer to
section 1.2 for Reference Documentation). The drivers can drive the motor in two
driving modes:
•
Standard Driving Mode
– standard motor operation mode. In this mode the
motor is motionless up to approximately ±1.5V command (Dead Band).
Nanomotion motion algorithm enables smooth motion as well as micron-level
displacement. This drive mode is the default mode for open / close-loop.
