Asai, "Nanometer stepping drives of surface acoustic wave motor
," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol.
Nanometer stepping drives of surface acoustic wave motor
, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 50 (4): 376-385.
The lenses also include Nikon's Silent Wave Motor
for fast and silent focusing and Super Integrated Coating on elements to give excellent color reproduction.
Instead, Field Orient Control F (FOC)--also called C Vector control--was applied using multiple shunt inputs in combination with DSPs, making component, development, and validation cost such that sine wave motor
control was only viable for high-end models.
For longer travel ranges, a variety of different piezo motors is available, from high-force, high resolution "piezo-walk" type designs, to high-speed ultrasonic, travelling wave motors
, and compact, low cost stick-slip (inertial) drives.