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help me plz asked how can we get the high frequency required for ultrasonic motors?

The general principle of the operation of ultrasonic motors is to generate gross mechanical motion through the amplification and repetition of micro-deformations of active material. The active material induces an orbital motion of the stator at the rotor contact points and frictional interface between the rotor and stator rectifies the micro-motion to produce macro-motion of the stator. The active material, which is a piezoelectric material, excites a traveling flexural wave within the stator that leads to elliptical motion of the surface particles. Teeth are used to enhance the speed that is associated with the propelling effect of these particles. The rectification of the micro-motion an interface is provided by pressing the rotor on top of the stator and the frictional force between the two causes the rotor to spin. This motion transfer operates as a gear leads to a much lower rotation speed than the wave frequency. A stator substrate is assumed to have a thickness, tS, with a set of piezoelectric crystals that are bonded to the back surface of the stator in a given pattern of poling sequence and location. The thickness of the piezoelectric crystals is tp. The total height, h, is the sum of the thickness of the crystals and the stators (bonding layer is neglected). The overall height of the stator is also allowed to vary with radial position. The outer radius of the disk is b and the inner hole radius is a. To generate traveling wave, the piezoelectric crystals poling direction is structured such that quarter wavelength out-of-phase is formed. This poling pattern is also intended to eliminate extension in the stator and maximize bending. The teeth on the stator are arranged in a ring at the radial position.

And got the following answer:

ultrasonic motor An ultrasonic motor is a type of electric motor formed from the ultrasonic vibration of a component, the stator, placed against another, the rotor or slider depending on the scheme of operation (rotation or linear translation). Ultrasonic motors differ from piezoelectric actuators in several ways, though both typically use some form of piezoelectric material, most often lead zirconate titanate and occasionally lithium niobate or other single-crystal 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 sliding distances, while piezoelectric actuators are limited by the static strain that may be induced in the piezoelectric element. Mechanism Dry friction is often used in contact, and the ultrasonic vibration induced in the stator is used both to impart motion to the rotor and to modulate the frictional forces present at the interface. The friction modulation allows bulk motion of the rotor (i.e., for farther than one vibration cycle); without this modulation, ultrasonic motors would fail to operate. Two different ways are generally available to control the friction along the stator-rotor contact interface, traveling-wave vibration and standing-wave vibration. Some of the earliest versions of practical motors in the 1970's, by Sashida [Ueha and Tomikawa, Ultrasonic Motors---Theory and Applications. Oxford: Clarendon Press, 1993], for example, used standing-wave vibration in combination with fins placed at an angle to the contact surface to form a motor, albeit one that rotated in a single direction. Later designs by Sashida and researchers at Matsushita, ALPS, and Canon made use of traveling-wave vibration to obtain bi-directional motion, and found that this arrangement offered better efficiency and less contact interface wear. An exceptionally high-torque 'hybrid transducer' ultrasonic motor uses circumferentially-poled and axially-poled piezoelectric elements together to combine axial and torsional vibration along the contact interface, representing a driving technique that lies somewhere between the standing and traveling-wave driving methods. A key observation in the study of ultrasonic motors is that the peak vibration that may be induced in structures occurs at a relatively constant vibration velocity regardless of frequency. The vibration velocity is simply the time derivative of the vibration displacement in a structure, and is not (directly) related to the speed of the wave propagation within a structure. Many engineering materials suitable for vibration permit a peak vibration velocity of around 1 m/s. At low frequencies --- 50 Hz, say --- a vibration velocity of 1 m/s in a woofer would give displacements of about 10 mm, which is visible to the eye. As the frequency is increased, the displacement decreases, and the acceleration increases. As the vibration becomes inaudible at 20 kHz or so, the vibration displacements are in the tens of micrometers, and motors have been built [Shigematsu, et al., IEEE TUFFC 2003 50(4), pp 376-85] that operate using 50 MHz [[surface acoustic wave (SAW)]] that have vibrations of only a few nanometers in magnitude. Such devices require care in construction to meet the necessary precision to make use of these motions within the stator. More generally, there are two types of motors, contact and non-contact, the latter of which is rare and requires a working fluid to transmit the ultrasonic vibrations of the stator toward the rotor. Most versions use air, such as some of the earliest versions by Dr Hu Jintao [Hu, et al., IEEE TUFFC 48(3) 2001, pp. 699-708; Hu, et al, Ultrasonics 35(6) 1997, pp. 459-469]. Research in this area continues, particularly in near-field acoustic levitation for this sort of application [Koyama, et al, 2005 IEEE Ult Symp., v3, pp 1538-41]. (This is different from far-field acoustic levitation, which suspends the object at half to several wavelengths away from the vibrating object.) Canon was one of the pioneers of the ultrasonic motor, and made the "USM" famous in the 1980's by incorporating it into its autofocus lenses for the Canon EF lens mount. Numerous patents on ultrasonic motors have been filed by Canon, its chief lensmaking rival Nikon, and other industrial concerns since the early 1980's. The ultrasonic motor is now used in many consumer and office electronics requiring precision rotations over long periods of time.

The matsushita electric works work extremely nicely with distinct applications which are specific to energy distribution and protection. The relays come with wide adjustment ranges with a scale that is certainly easy to study either in three or four digits according to the model. These matsushita electric works aid in increasing the flexibility on the applications, cut down the overall energy and upkeep charges. You will find relays which are utilised for common purposes which come in dependable designs with fast replacement alternatives. And you will discover models which are applied for industrial applications and heavier duty applications that work on big loads. These solutions are made to meet the lifetime industrial manage requires with the applications.
Their most up-to-date merchandise will be the Time counter, Timer Delay, matsushita electric works, Rapid Connect Couplings, Electronic Motor Couplings, Aluminum Couplings, Morse Couplings and numerous others. The web site provides a detailed description of every model in many categories of matsushita electric works couplings and sensors. These solutions are particularly valuable for high-risk applications. The matsushita electric works are also out there with capabilities like many timing ranges and functions. The company is at present in search of agents and dealers who can promote and sell their factory made solutions. They’re constantly on a lookout for creating new and much more trusted products based on the wants and needs from the business.
The matsushita electric works work exceptionally properly with unique applications that happen to be distinct to energy distribution and protection. The relays come with wide adjustment ranges having a scale that may be easy to read either in three or four digits in accordance with the model. These matsushita electric works support in rising the flexibility from the applications, reduce the overall power and upkeep charges. There are relays that are employed for basic purposes which are available in reputable styles with quick replacement solutions. And there are actually models which are used for industrial applications and heavier duty applications that work on big loads. These solutions are made to meet the lifetime industrial handle requirements in the applications.
Their newest goods are the Time counter, Timer Delay, matsushita electric works, Speedy Connect Couplings, Electronic Motor Couplings, Aluminum Couplings, Morse Couplings and numerous other individuals. The site delivers a detailed description of every single model in many categories of matsushita electric works couplings and sensors. These merchandise are very useful for high-risk applications. The matsushita electric works are also obtainable with attributes like many timing ranges and functions. The company is presently in search of agents and dealers who can market and sell their factory made solutions. They’re usually on a lookout for building new and much more dependable items according to the desires and needs of the sector.

Dynapower TC-300R8A 300W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply

Dynapower TC-300R8A 300W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply

Dynapower TC-300R8A 300W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply - Manufacturer: Dynapower - Mfg Part Number: TC-300R8A - Condition: New - Packaging: Retail


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Dynapower TC-700RVN2 700W ROHS Dual AC Inlet EPS 12V Redundant Power Supply

Dynapower TC-700RVN2 700W ROHS Dual AC Inlet EPS 12V Redundant Power Supply - Manufacturer: Dynapower - Mfg Part Number: TC-700RVN2 - Condition: New - Packaging: Retail


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Dynapower TC-650RVN2 650W ROHS Dual AC Inlet EPS 12V Redundant Power Supply

Dynapower TC-650RVN2 650W ROHS Dual AC Inlet EPS 12V Redundant Power Supply - Manufacturer: Dynapower - Mfg Part Number: TC-650RVN2 - Condition: New - Packaging: Retail


Dynapower TC-1U40-TH 1U 400W ROHS w/ Thermal Control EPS 12V Short Depth Power Supply

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Rosewill CAPSTONE-650 650W ATX EPS 12V Active PFC 80PLUS 140mm Silent Fan Power Supply

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Dynapower TC-2U40-TH 2U 400W ROHS with Thermal Control EPS 12V Short Depth Power Supply

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Dynapower TC-2U35-TH 2U 350W ROHS with Thermal Control EPS 12V Short Depth Power Supply - Manufacturer: Dynapower - Mfg Part Number: TC-2U35-TH - Condition: New - Packaging: Retail


Dynapower TC-1U35-TH 1U 350W ROHS w/ Thermal Control EPS 12V Short Depth Power Supply

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Dynapower TC-500R8A 500W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply

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Dynapower TC-400R8A 400W ROHS Dual AC Inlet EPS 12V Mini Redundant Power Supply

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Dynapower SS-2U60EL 2U 600W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

Dynapower SS-2U60EL 2U 600W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

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XIGMATEK NRP-HC1001 1000w ATX 12v v2.2 / eps 12v v2.92 80 plus & sli ready modularized w/ active pfc power supply

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Dynapower SS-1U60EL 1U 600W Active PFC EPS 12V Short Depth 80Plus Bronze Certified Server Power Supply

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Dynapower SS-1U60EL 1U 600W Active PFC EPS 12V Short Depth 80Plus Bronze Certified Server Power Supply - Manufacturer: Dynapower - Mfg Part Number: SS-1U60EL - Condition: New - Packaging: Retail


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Dynapower SS-2U50ES 2U 500W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

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Dynapower SS-1U52ES 1U 500W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply

Dynapower SS-1U52ES 1U 500W Active PFC EPS 12V Short Depth 80 Plus Bronze Certified Server Power Supply - Manufacturer: Dynapower - Mfg Part Number: SS-1U52ES - Condition: New - Packaging: Retail


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