Design, Analysis, and Implementation of Wireless Traveling-Wave Ultrasonic Motors

Zhiwei Xue, Kwok Tong Chau, Wei Liu, Tze Wood Ching

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Wireless motors have been extensively investigated for their flexibility and convenience, but they inevitably suffer from vulnerability to magnetic field interference, insufficient robustness, and the need for numerous power switches. Therefore, a wireless traveling-wave ultrasonic motor (USM) with high robustness is proposed in this article, which artily integrates capacitive power transfer into a USM to derive the brand-new nonmagnetic wireless direct-drive motor. Prominently, differing from the existing wireless motors, the proposed wireless USM avoids the use of fragile microcontrollers and active or passive switches at the motor side, the control process of which can be completely conducted at the primary side, thus facilitating high-degree integration and maintenance-free operation. In addition, the bidirectional motion capability and flexible speed regulation can be readily achieved by changing the sequence and amplitude of two-phase outputs at the primary side, enabling the real sense of wireless direct drive. Finally, theoretical analysis and hardware experimentation are given to verify the feasibility of the proposed wireless USM for nonmagnetic biomedical and aerospace applications.

Original languageEnglish
Pages (from-to)4601-4611
Number of pages11
JournalIEEE Transactions on Power Electronics
Issue number4
Publication statusPublished - 1 Apr 2024


  • Capacitive power transfer
  • high-robustness
  • nonmagnetic wireless motor
  • ultrasonic motor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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