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Topic: Ultrasonic motor

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	K-Technik - Patente
		Ultrasonic motors do not generate a disruptive magnetic field and therefore do not influence the magnetic field sensors of a compass.
		Firstly, the said ultrasonic motor is amagnetic therefore by definition avoids inducing deviation of the magnetic field sensors of the compass.
		Since the piezo motor, in contrast to the conventional "Lavet" motor which is usually one directional, operates in two directions (by changing the frequency of heading) it is especially suitable for the functioning of a compass and/or altimeter.
	www.k-technik.com /patentefulleng.htm (2053 words)

	Canon Technology -Ultrasonic Motors- (Site not responding. Last check: 2007-09-30)
		Originally, Canon developed an ultrasonic motor to serve as the driving motor for the EF lens in its EOS series AF SLR cameras.
		Now, our ultrasonic motors are used to drive photosensitive drum units in office-use color copying machines, providing the durability needed to perform high-precision rotations over long periods of time.
		The piezoelectric ceramic elements on the base of the stator become mutually polarized and an AC voltage of 30,000 Hz (The word "ultrasonic" in USM derives from the frequency of this AC charge) is applied to generate a stationary wave (amplitude approx.
	www.canon.com /technology/device/04.html (313 words)

	Engineers Pursuing the Ultimate in the Evolution of Wristwatch Technology -- Seiko Instrumrnts Inc.
		The ultrasonic motor is superior to the magnetic motor with magnetic circuits for the driving function: no influence from magnetic fields, small size, high torque, fast response, ability to execute extremely small movements, high static torque, and so on.
		It is well known that an ultrasonic motor is used for the driving source of auto-focus cameras, and the motor is also used as the driving source of rolled curtains and medical MRI (magnetic resonance imaging) which deals with strong magnetism, and other devices.
		Ultrasonic micromotors were originally developed for wristwatches, but their full potential lies in smaller and more highly efficient micromechanisms and wearable instruments.
	www.natureinterface.com /e/ni03/P045-049 (1897 words)

	Canon EF lens mount - Wikipedia, the free encyclopedia
		Canon EF lenses also demonstrate successful commercialisation of mechanical and optical technologies, such as the Ultrasonic Motor (USM) drive, Image Stabilizer (IS), Diffractive Optics (DO) and using fluorite and aspherical elements in the construction of their L-series (or "Luxury") lenses for superb image quality.
		Although Canon does not endorse (and in fact warns against) the use of third-party lenses and adapters, the EF lens mount is ideal for the use of adapters, due to its large diameter and the relatively short flange focal distance of 44.0 mm
		Ultrasonic motor (USM) lenses first appeared with the introduction of the EF 300 mm f/2.8L USM lens in 1987.
	en.wikipedia.org /wiki/Canon_EF_lens_mount#Diffractive_Optics (1577 words)

	SOLID-STATE ACTUATION AS A DRIVING MECHANISM
		Ultrasonic rotary motors are being developed as actuators for miniature spacecraft instruments and subsystems.
		Ultrasonic motors [5] can be classified by their mode of operation (static or resonant), type of motion (rotary or linear) and shape of implementation (beam, rod, disk, etc.).
		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.
	ndeaa.jpl.nasa.gov /nasa-nde/lommas/spie-usm97.htm (2028 words)

	Dynamic Properties of Piezoelectric Ultrasonic Motors for Space Robotics Applications (Site not responding. Last check: 2007-09-30)
		This research enhanced the UHCL piezoelectric ultrasonic motor apparatus by the addition of an inertial load and measured motor dynamic response using a commercial motor driver.
		The motor torque is proportional to the slope of the curves in Fig.
		This controller is intended to regulate motor speed and, therefore, varies drive signal frequency as a function of motor feedback signal amplitude.
	www.isso.uh.edu /publications/A2003/dabney.htm (820 words)

	Actuated Ball-and-Socket Joints
		ABS joints are expected to be particularly attractive for use as robot joints and as general low-power orienting actuators for diverse applications that could include robot hands, tools, and mechanisms for aiming scientific instruments.
		Figure 1 illustrates an ultrasonic motor similar to those that would be included in an ABS joint.
		Ultrasonically Vibrating Prods would be inserted in the ground,in a manner similar to that of a mnaual search for mines.
	www.nasatech.com /Briefs/Oct01/NPO20984.html (741 words)

	Technical Room - USM (Site not responding. Last check: 2007-09-30)
		The Ultrasonic Motor (USM) is an AF (auto focus) driving motor which Canon commercialized for the first time in the world.
		Ultrasonic motors, on the other hand, are based on a completely new principle in which rotational force is generated from ultrasonic vibrational energy.
		The basic motor construction is very simple, consisting of an elastic stator and a rotating rotor.
	www.canon.com /camera-museum/tech/room/b_usm.html (173 words)

	TAP: Gallery: Ultrasonic Motors (USM) (Site not responding. Last check: 2007-09-30)
		Efficient miniature motors that are compact and consume little power are needed to drive mechanisms in future NASA space missions.
		The number of components required to construct an ultrasonic motor is small, minimizing the number of potential failure points.
		For an Ultrasonic Motor to work a traveling wave is established over the stator - the motor's stationary surface - which behaves as an elastic ring, and produces elliptical motion at the interface with the rotor.
	www.jpl.nasa.gov /technology/images_videos/iv_pages/Yosi_Ultrasonic_Motor2.html (278 words)

	CUED home page - Thorsten Hack - Ultrasonic Motors (Site not responding. Last check: 2007-09-30)
		Ultrasonic motors and linear motors work above 20 kHz and are therefore inaudible to the human ear.
		The problem with the described motor is that sliding along the surface of the rotor causes great frictional heat loss and hence wear of the piezoelectric vibrator.
		The main drawback of this motor is the rapid wear caused by friction at the contact surface between the vibrator and the rotor.
	www-civ.eng.cam.ac.uk /dsl/th/ultrasonicdsl.html (415 words)

	ECS EPrints Service - A novel multi-degree-of-freedom thick-film ultrasonic motor
		Conventional ultrasonic motors using bulk lead zirconate titanate (PZT) or thin-film PZT layers are relatively expensive at the present time.
		To demonstrate the feasibility of this approach, an ultrasonic motor was fabricated from alumina using thick-film printed PZT actuators.
		Rotations in three orthogonal directions have been observed by controlling the phase of the driving signal to the PZT electrodes and a MDOF ultrasonic motor was successfully realised.
	eprints.ecs.soton.ac.uk /8866 (318 words)

	Kyocera \| Products \| Kyocera Industrial Ceramics Corporation \| News
		A low-frequency voltage is applied to the ultrasonic motor's piezoelectric elements, and low-speed drive is made possible due to the small amplitude of the vibration of these elements.
		Another ultrasonic motor with capabilities exceeding those of conventional units was developed through joint research by Kyocera and Professor Sadayuki Ueba of the Precision Engineering Laboratory of the Tokyo Institute of Technology.
		This new ultrasonic motor is capable of operating in a speed range exceeding 200 mm/sec., which places it at the forefront of the industry.
	americas.kyocera.com /kicc/news/news_detail.cfm?key=863 (1099 words)

	[No title]
		These conventional ultrasonic motor designs have a limitation of the size reduction because of a complexity of the structure.
		The subject invention is a bi-directional rotary type ultrasonic motor, which consists of only one type of element driven by a single-phase power supply.
		In this case the stator component of the rotary motor is used as a moving slider element.
	www.research.psu.edu /ipo/faculty_staff/disclosures/Uchino_96_1633.html (396 words)

	SQL-1.5 Piezoelectric Motor (Site not responding. Last check: 2007-09-30)
		At 1.5 mm x 1.5 mm, the new SQL-1.5 piezoelectric motor is half the size of competing micromotors and offers a 20-gram push force and sub-Âµm position resolution, performing 10 times better than its closest competitor on both counts, New Scale said.
		Their ultrasonic motor design has much lower power consumption than miniature electromagnetic motors and holds its position when the power is turned off, further conserving battery life.
		The motor itself is tiny, but its high precision is what enables the most dramatic reduction in overall device size, the company said.
	www.photonics.com /content/products/2006/May/26/82827.aspx (602 words)

	Project-Team-ALCOVE (Site not responding. Last check: 2007-09-30)
		A new modelling of travelling wave ultrasonic motors is established in [13] in order to provide the torque control law for this kind of actuators.
		In fact, in Travelling Wave Ultrasonic Motor, stator and rotor are pressed together: a "dead zone" effect exists, wich is almost equivalent to a large static friction torque.
		Experimental results have been carried out on a very small ultrasonic motor and force-feedback application have been tested without speed-reducer.
	www.inria.fr /rapportsactivite/RA2004/alcove2004/uid49.html (155 words)

	Mirco Actuators / DMD Devices
		Although some attempts were made to create minature motors, efforts were limited by the lack of tools needed to build on such a small scale, and a lack of understanding of the physical forces which occur at this scale.
		However advances in electromagnetic motors are being made as evidenced from the two motors shown below, courtesy of the University of Sheffield, United Kingdom.
		Thus, these motors will be found in intermittent use applications such as the motor which drives the focusing ring in autofocus cameras.
	www.herberts.org /wayne/proj435/proj435.htm (3612 words)

	Biophan
		The SQUIGGLE motor is a revolutionary linear actuator that sets a new benchmark for small size and high performance.
		The ultrasonic vibrations are created by piezoelectric ceramic actuators which change shape when electrically excited.
		When a motor is connected to the controller the “saved” parameters are downloaded to the electronics.
	www.biophan.com /ceramicpic.php (428 words)

	Surface Acoustic Wave Linear Motor
		The miniaturized SAW linear motor was driven for 8 msec.
		An outline of the SAW linear motor was described and the first trial and the first success of the miniaturized SAW linear motor driven at 50 MHz was demonstrated.
		The miniaturized SAW linear motor with much higher operating frequency will be fabricated for further miniaturization.
	www.intellect.pe.u-tokyo.ac.jp /research/sawmotor/sawmotor_e.html (1036 words)

	Canon EOS Lens Motors
		As of November 1996, some lenses with AFD motors include the 50 macros, the 24, 28, and 35 fixed wide angles, and 135 soft focus lens, and the 100-300L zoom.
		Beginning in 1987 with the 300/2.8, Canon has been slowly equipping its best lenses with the ring ultrasonic motor, in which the rotor and stator are big circles around the optics.
		The micro ultrasonic motor is a tiny little motor that they stick in the lens and then connect with gears to the focus mechanism.
	www.photo.net /equipment/canon/lens-motors (2671 words)

	Motors and Stages are suited for miniaturized products., New Scale Technologies
		The Squiggle motor uses a piezoelectric ceramic tube that supports two threaded nuts which hold a threaded shaft.
		Squiggle motors are ten times more efficient than competitive products, which means they produce high force and speed while using little power.
		Oct 22, 2003 - Linear Motor is designed for use in biomedical equipment.
	news.thomasnet.com /fullstory/452681/1424 (886 words)

	Steve Weixel \| Lens Tour
		Many common lenses have this very motor, from the 28-105 f/3.5-4.5 and 85 f/1.8, to the 300 f/4L and 70-200 f/2.8L.
		This is the only part of the motor that moves.
		A motor is useless without some kind of transmission, and this is it.
	www.photoscene.com /sw/tour/inside.htm (1207 words)

	Motor design
		The goal is the design of motors and electric drives taking into account constraints such as sizes, acceleration, masses, etc. The main motors are modelled for their pre-design and their external characteristics.
		Compared with electromagnetic actuators, there is no danger of interference due to electromagnetic induction because no magnetic field is used and ultrasonic motors are more quiet since speed-reduction gears are not required.
		There are two types of ultrasonic motors: the standing wave type and the travelling wave type.
	laiwww.epfl.ch /research/motor_D.html (305 words)

	Canon PowerShot S1 IS, plus hands-on: Digital Photography Review
		Interestingly the lens zoom is driven by a small USM (ultrasonic motor) similar to those found in Canon SLR lenses, the motor has multiple speeds and even a slow silent mode specifically designed for shooting movies.
		The zoom is driven by a tiny ultrasonic motor (USM).
		The motor uses ultrasonic frequency vibrations to drive a tiny rotor which is fast, powerful and highly responsive.
	www.dpreview.com /news/article_print.asp?date=0402&article=04020907canons1is (1031 words)

	Glossary
		Super UD glass was introduced in 1993 as a new material that achieves almost the same performance as fluorite while achieving a new balance of cost reduction and higher quality.
		Canon became the first camera maker to apply the use of an advanced USM (Ultrasonic Motor) in 1987 when the EF 300mm f/2.8L USM amazed the world with its silent, super-fast autofocus performance.
		The motor’s ring shape is optimally suited to lens barrel applications and its low rotation speed is ideal for lens drive purposes.
	www.usa.canon.com /html/eflenses/lens101/glossary/index_s.html (1655 words)

	Canon EF Lenses for the EOS 10D
		All communications between the lens and the camera pass through electrical circuits including the electrical power needed to operate the motors that focus the lens and and set the aperture.
		Since electronically coupled lenses need motors to move lens groups to focus the image, Canon had to develop some small, light, and powerful motors.
		Unlike traditional motors that use a magnetic field to rotate an armature, these motors use ultrasonic vibrational forces to rotate a ring.
	www.shortcourses.com /10D/lenses.htm (1578 words)

	kwc blog: Canon USM
		One bit of Canon terminology that is troubling is USM, a technology for autofocusing that stands for "Ultrasonic Motor." USM was a term they first started using in 1987 when they developed a new fast and quiet motor, which they dubbed a "ring ultrasonic motor" -- the motor uses tiny vibrations to generate rotation.
		Several years later, Canon developed a new autofocusing technology that is a motor that connects to the focusing mechanism via a set of gears.
		The downside of this new motor is that it is louder than the ring-style mechanism and in most lenses that it is used in you cannot do manual focusing when in auto focus mode -- you need to check if the lens has "FTM" (full time manual) as a feature.
	kwc.org /blog/archives/2005/2005-04-19.canon_usm.html (702 words)

	Oxford University Press
		The ultrasonic motor, invented in 1980, utilizes the piezoelectric effect in the ultrasonic frequency range to provide the motive force.
		This book is the result of a collaboration between the inventor and an expert in conventional electric motors: the result is an introduction to the general theory presented in a way that links it to conventional motor theory.
		It will be invaluable both to motor designers and to those who design with and use electric motors as an introduction to this important new invention.
	www.oup.com /ca/isbn/0-19-856395-7 (245 words)

	Firmware suits precision motion control applications., Galil Motion Control, Inc.
		Anti-friction bias alleviates problems when motor stops and power is removed, while deadband capture and 2 sets of PID filters aid in point-to-point control.
		Because of their high level of friction, these motors can hold a position at a standstill without any vibration when the motor is stopped and the power removed," explained Lisa Wade, Galil's VP-Marketing and Sales.
		Galil offers the Ultrasonic Motor Special Firmware for a one time $400.00 fee and is immediately available for shipment from stock.
	news.thomasnet.com /fullstory/7013/2585 (657 words)

	Piezoelectric Motor
		This motor module may be palm sized, but it packs a decent punch.
		OEMs may purchase the lightweight, low profile motor and PCB assembly as separate components for easy integration into higher levels of assemblies.
		Information is available for interested companies and OEM developers for the new Model PDA130 Piezoelectric Motor The package includes Application Notes, CAD Files, and Outline and Installation Drawings.
	www.edoceramic.com /Assemblies_Products/PEMot.htm (175 words)

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