A new flextensional piezoelectric ultrasonic motor - Design, fabrication and characterisation

J. T. Leinvuo, Stephen Wilson, R. W. Whatmore, M. G. Cain

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)


    This paper presents the techniques used for the characterisation of a new type of standing-wave piezoelectric ultrasonic motor. The motor uses a metallic flextensional amplifier, or "cymbal", to convert the radial mode vibrations of a piezoelectric ceramic disc into flexural oscillations, which are further converted to produce rotary actuation by means of an elastic fin friction drive. The motor operates on a single-phase electrical supply. A beryllium copper rotor design with three-fin configuration was adopted. The best stall torque, no load speed, transient time and efficiency for a 25 mm motor were 2 N mm, 680 rpm, 2 ms and 4.8%, respectively. The operational characteristics of the motor were evaluated by using two methods: one based on the pulley-brake principle and one on high-speed imaging. The results obtained from using these two techniques are contrasted and compared. (c) 2006 Elsevier B.V. All rights reserved.

    Original languageEnglish
    Pages (from-to)141-151
    Number of pages11
    JournalSensors and Actuators A - Physical
    Issue number1
    Publication statusPublished - 8 Jan 2007


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