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09-05-2017, 10:19 AM

Please put the report on ultrasonic motor

jaseela123d · 11-05-2017, 11:00 AM

An ultrasonic motor is a type of electric motor driven by the ultrasonic vibration of a component, the stator, placed against another component, the rotor or the cursor depending on the scheme of operation (rotation or linear translation). Ultrasonic motors differ from piezoelectric actuators in several ways, although both typically use some type of piezoelectric material, often carrying zirconate titanate and occasionally lithium niobate or other monocrystalline materials. The most obvious difference is the use of resonance to amplify the vibration of the stator in contact with the rotor in ultrasonic motors. Ultrasonic motors also offer arbitrarily large rotation or slip distances, whereas piezoelectric actuators are limited by the static deformation that can be induced in the piezoelectric element.

A common application of ultrasonic motors is found in camera lenses where they are used to move lens elements as part of the autofocus system. Ultrasonic motors replace the louder and often slower micromotor in this application.

Applications

Canon was one of the pioneers of the ultrasound engine, and made the "USM" famous in the late 1980s by incorporating it into its autofocus lenses for the Canon EF lens mount. Numerous patents on ultrasonic motors have been submitted by Canon, Nikon's leading lens manufacturer, and other industrial concerns since the early 1980s. Canon has not only included an ultrasonic motor (USM) in its DSLR lenses, but also in the Canon PowerShot SX1 IS bridge camera. The ultrasonic motor is now used in many consumer and office electronics that require precision rotations over long periods of time.

The technology has been applied to photographic lenses by a variety of companies under different names:

• Canon - USM, UltraSonic Motor

• Minolta, Konica Minolta, Sony - SSM, super sonic wave motor (ring motor)

• Nikon - SWM, silent wave motor

• Olympus - SWD, supersonic wave unit

• Panasonic - XSM, extra quiet engine

• Pentax - SDM, supersonic dynamic motor

• Sigma - HSM, Sonic Hiper Motor

• Sony - DDSSM, Direct Drive Super Sonic Wave Motor (Linear Motor)

• Tamron - USD, Ultrasonic Silent Drive; PZD, Piezo Drive

• Actuated Medical, Inc. - Direct Drive, MRI Compatible Ultrasonic Motor

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