@inproceedings{9559,
  author       = {{Zhou, W and Fu, Bo and Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of 2nd International Workshop on Piezoelectric Materials and Applications in Actuators}},
  pages        = {{213}},
  title        = {{{Piezoelectrics in dental tools}}},
  volume       = {{Band 180}},
  year         = {{2006}},
}

@inproceedings{9527,
  author       = {{Hemsel, Tobias}},
  booktitle    = {{Mechatronik 2005 Innovative Produktentwicklung}},
  number       = {{Band 2}},
  pages        = {{1013--1032}},
  title        = {{{Modellgestützte Analyse piezoelektrischer Transformatoren}}},
  volume       = {{1892}},
  year         = {{2005}},
}

@inproceedings{9528,
  author       = {{Hemsel, Tobias and Mracek, Maik and Twiefel, Jens and Vasiljev, Piotr and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of the First International Conference on Ultrasonic Motors and Actuators (IWOUMA)}},
  pages        = {{32--36}},
  title        = {{{Linear ultrasonic motors based on coupling of longitudinal vibrations}}},
  year         = {{2005}},
}

@inproceedings{9530,
  author       = {{Mracek, Maik and Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of the First International Conference on Ultrasonic Motors and Actuators (IWOUMA)}},
  pages        = {{23--24}},
  title        = {{{Parallel Operation of Ultrasonic Linear Motors}}},
  year         = {{2005}},
}

@inproceedings{9531,
  author       = {{Twiefel, Jens and Hemsel, Tobias and Kauczor, Christopher and Wallaschek, Jörg}},
  booktitle    = {{6th International Workshop on Research and Education in Mechatronics}},
  pages        = {{356--361}},
  title        = {{{Teaching Mechatronics to a Mixed Audience from Industry and University}}},
  year         = {{2005}},
}

@misc{52642,
  author       = {{Wallaschek, J. and Hemsel, Tobias and Mracek, M.}},
  isbn         = {{3-935433-89-1}},
  title        = {{{Proceedings of the 2nd International Workshop on Piezoelectric Materials and Applications in Acutators}}},
  volume       = {{Band 180}},
  year         = {{2005}},
}

@inproceedings{8951,
  author       = {{Fu, Bo and Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of the 18th International Congress on Acoustics, ICA}},
  pages        = {{4--9}},
  title        = {{{Model-based Diagnosis for Sandwiched Ultrasonic Transducers}}},
  year         = {{2004}},
}

@inproceedings{8953,
  author       = {{Hemsel, Tobias}},
  booktitle    = {{Proceedings of the First International Conference on Ultrasonic Motors and Actuators (IWOUMA)}},
  title        = {{{Linear piezoelectric motors and their application}}},
  year         = {{2004}},
}

@inproceedings{9519,
  abstract     = {{Several positioning tasks demand translatory drive instead of rotary motion. To achieve drives that are capable e.g. to drive the sunroof of a car or to lift a car's window, multiple miniaturized motors can be combined. But in this case many other questions arise: the electromechanical behavior of the individual motors differs slightly, the motor characteristics are strongly dependent on the driving parameters and the driven load, many applications need some extra power for special cases like overcoming higher forces periodically. Thus, the bundle of motors has to act well organized and controlled to get an optimized drive that is not oversized and costly.}},
  author       = {{Hemsel, Tobias and Mracek, Maik and Wallaschek, Jörg and Vasiljev, Piotr}},
  booktitle    = {{Ultrasonics Symposium, 2004 IEEE}},
  issn         = {{1051-0117}},
  keywords     = {{drives, electromechanical effects, linear motors, ultrasonic motors, car sunroof, car window, electromechanical behavior, high power ultrasonic linear motors, multiple miniaturized motors, positioning tasks, translatory drive, Costs, Electromagnetic forces, Frequency, Laboratories, Manufacturing, Mechatronics, Micromotors, Ultrasonic imaging, Vibrations, Voltage}},
  number       = {{Vol.2}},
  pages        = {{1161--1164}},
  title        = {{{A novel approach for high power ultrasonic linear motors}}},
  doi          = {{10.1109/ULTSYM.2004.1417988}},
  volume       = {{2}},
  year         = {{2004}},
}

@inproceedings{9521,
  author       = {{Littmann, Walter and Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of the 18th International Congress on Acoustics}},
  pages        = {{2889--2892}},
  title        = {{{Design criteria for piezoelectric transformers}}},
  volume       = {{4}},
  year         = {{2004}},
}

@inproceedings{9522,
  author       = {{Mracek, Maik and Wallaschek, Jörg and Hemsel, Tobias}},
  booktitle    = {{Proceedings of the 18th International Congress on Acoustics}},
  pages        = {{417--420}},
  title        = {{{Self configuration of miniature ultrasonic linear motors}}},
  year         = {{2004}},
}

@inproceedings{9524,
  author       = {{Fu, Bo and Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of the 18th International Congress on Acoustics, ICA}},
  pages        = {{4--9}},
  title        = {{{Model-based Diagnosis for Sandwiched Ultrasonic Transducers}}},
  year         = {{2004}},
}

@inproceedings{8935,
  author       = {{Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Proceedings of the 5th International Congress of Intelligent Materials (ICIM)}},
  title        = {{{Modelling and Analysis of Piezoelectric Transformers}}},
  year         = {{2003}},
}

@inproceedings{8936,
  author       = {{Littmann, Walter and Hemsel, Tobias and Kauczor, Christopher and Wallaschek, Jörg and Sinha, W}},
  booktitle    = {{Proceedings of World Congress Ultrasonics}},
  pages        = {{547--550}},
  title        = {{{Load-adaptive phase-controller for resonant driven piezoelectric devices}}},
  year         = {{2003}},
}

@inproceedings{8926,
  abstract     = {{Piezoelectric transformers are well known since the publication of some patent applications at the end of the 1950s. But until today their only business use lies in the field of backlighting systems for LCDs. Due to key features as light-weight, flatness, high step-up at low volume and high efficiency piezoelectric transformers should be usable in a much broader range of applications. This contribution returns to mind their operating principle, shows how to model and to develop such devices as well as give some aspects for development trends that will lead to further applications.}},
  author       = {{Hemsel, Tobias and Littmann, Walter and Wallaschek, Jörg}},
  booktitle    = {{Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE}},
  issn         = {{1051-0117}},
  keywords     = {{piezoelectric devices, reviews, transformers, backlighting systems, flatness, high efficiency piezoelectric transformers, high step-up, light-weight, low volume, operating principle, piezoelectric transformers, Circuits, Costs, Electromagnetic devices, Electromagnetic fields, Mechanical energy, Piezoelectric materials, Power electronics, Switching frequency, Transformers, Vibrations}},
  number       = {{vol.1}},
  pages        = {{645--648}},
  title        = {{{Piezoelectric transformers - state of the art and development trends}}},
  doi          = {{10.1109/ULTSYM.2002.1193485}},
  volume       = {{1}},
  year         = {{2002}},
}

@inproceedings{8927,
  author       = {{Hemsel, Tobias and Littmann, Walter and Wallaschek, Jörg}},
  booktitle    = {{47. Internationales Wissenschaftliches Kolloquium}},
  title        = {{{Piezoelektrische Transformatoren - Bauformen und Modellierung}}},
  year         = {{2002}},
}

@inproceedings{8925,
  author       = {{Wallaschek, Jörg and Hemsel, Tobias}},
  booktitle    = {{Special Antriebstechnik}},
  pages        = {{70--71}},
  title        = {{{Piezoelektrische lineare Schwingungsantriebe}}},
  year         = {{2001}},
}

@phdthesis{8469,
  author       = {{Hemsel, Tobias}},
  isbn         = {{ISBN 3-935433-10-7}},
  publisher    = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts}},
  title        = {{{Untersuchung und Weiterentwicklung linearer piezoelektrischer Schwingungsantriebe}}},
  volume       = {{101}},
  year         = {{2001}},
}

@article{8914,
  abstract     = {{Piezoelectric ultrasonic motors have been investigated for several years and have already found their first practical applications. Their key feature is that they are able to produce a high thrust force related to their volume. Beside rotary drives like the travelling wave motor, linear drives have also been developed, but only a few are presently commercially available. In the present paper, we first describe the state of the art of linear piezoelectric motors. The motors are characterized with respect to their no-load velocity, maximum thrust force, efficiency and other technical properties. In the second part, we present a new motor, which is judged to be capable of surpassing the characteristics of other piezoelectric motors because of its unique design which allows the piezoelectric drive elements to be pre-stressed in the direction of their polarization. The piezoelectric elements convert energy using the longitudinal d33 effect which allows an improved reliability, large vibration amplitudes and excellent piezoelectric coupling. Energy loss by vibration damping is minimized, and the efficiency can be improved significantly. Experimental results show that the motor characteristics can be optimized for a particular task by choosing the appropriate operating parameters such as exciting voltage, exciting frequency and normal force. }},
  author       = {{Hemsel, Tobias and Wallaschek, Jörg}},
  issn         = {{0041-624X}},
  journal      = {{Ultrasonics}},
  keywords     = {{Linear motor}},
  pages        = {{37 -- 40}},
  title        = {{{Survey of the present state of the art of piezoelectric linear motors}}},
  doi          = {{10.1016/S0041-624X(99)00143-2}},
  volume       = {{38}},
  year         = {{2000}},
}

@inproceedings{8915,
  abstract     = {{Ultrasonic linear motors have now been investigated for several years. Their key features are high thrust forces related to their volume and good position-accuracy. This contribution consists of two main parts. In the first part we describe the state-of-the-art of linear piezoelectric motors. Characteristics like no-load velocity, maximum thrust force and other technical properties of commercially available devices will be reported as well as those of prototypes. In the second part we report an ongoing research and development project aiming at a linear piezoelectric motor, which is capable of surpassing some of the shortcomings of other piezoelectric motors}},
  author       = {{Hemsel, Tobias and Wallaschek, Jörg}},
  booktitle    = {{Ultrasonics Symposium, 2000 IEEE}},
  issn         = {{1051-0117}},
  keywords     = {{linear motors, ultrasonic motors, linear piezoelectric motor, maximum thrust force, no-load velocity, ultrasonic linear motor, Electromagnetic devices, Electromagnetic fields, Frequency, Friction, Gears, Materials science and technology, Piezoelectric materials, Research and development, Vibrations, Wheels}},
  pages        = {{663--666 vol.1}},
  title        = {{{State of the art and development trends of ultrasonic linear motors}}},
  doi          = {{10.1109/ULTSYM.2000.922635}},
  volume       = {{1}},
  year         = {{2000}},
}