@ARTICLE{Mracek2006a,
  author = {Maik Mracek and Tobias Hemsel},
  title = {Synergetic driving concepts for bundled miniature ultrasonic linear
	motors},
  journal = {Ultrasonics},
  year = {2006},
  volume = {44, Supplement},
  pages = {e597 - e602},
  note = {<ce:title>Proceedings of Ultrasonics International and World Congress
	on Ultrasonics (WCU)</ce:title>},
  __markedentry = {[K. Agbons jr:6]},
  abstract = {Rotary ultrasonic motors have found broad industrial application in
	camera lens drives and other systems. Linear ultrasonic motors in
	contrast have only found limited applications. The main reason for
	the limited range of application of these very attractive devices
	seems to be their small force and power range. Attempts to build
	linear ultrasonic motors for high forces and high power applications
	have not been truly successful yet. To achieve larger force and higher
	power, multiple miniaturized motors can be combined. This approach,
	however, is not as simple as it appears at first glance. The electromechanical
	behaviour of the individual motors differs slightly due to manufacturing
	and assembly tolerances. The individual motor characteristics are
	strongly dependent on the driving parameters (frequency, voltage,
	temperature, pre-stress, etc.) and the driven load and the collective
	behaviour of the swarm of motors is not just the linear superposition
	of the individual drive's forces. Thus, the bundle of motors has
	to be synchronized and controlled appropriately in order to obtain
	an optimized drive that is not oversized and costly. We have investigated
	driving and control strategies of a set of linear ultrasonic motors.
	Our contribution will be divided into three main parts. In part I
	ultrasonic linear motors will be introduced. In part II driving strategies
	for a single motor as well as for a bundle of motors will be presented.
	These concepts will be verified by simulation results and experimental
	data. In part III a simplified model for the motor's electromechanical
	behaviour will be given.},
  bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S0041624X06000965},
  bdsk-url-2 = {http://dx.doi.org/10.1016/j.ultras.2006.05.201},
  doi = {http://dx.doi.org/10.1016/j.ultras.2006.05.201},
  issn = {0041-624X},
  keywords = {Ultrasonic linear motor},
  owner = {K. Agbons jr},
  timestamp = {2013.11.23},
  url = {http://www.sciencedirect.com/science/article/pii/S0041624X06000965}
}