Magnetic Field Tuning Characteristics of Bimodal Ultrasonic Motor Stator

doi:10.1007/s12204-017-1811-y

Abstract

Abstract:

The magnetic field tuning characteristics of an ultrasonic motor (USM) stator are discussed. The stator consists of two piezoelectric ceramic transducer (PZT) plates and one sandwiched-in Terfenol-D plate. The dimensions of the stator are carefully adjusted to specifically discuss the influence of the magnetic field on the frequency difference between the longitudinal and bending modes of the stator. The frequency difference discussed in this paper is usually small and mainly caused by uneven materials, machining errors and changes in external conditions (temperature, pre-stress or load). The longitudinal and bending modes of the stator are simultaneously excited by an external electric field to generate the elliptic motion trajectories of the driving points. A direct current (DC) magnetic field is applied to decrease the difference between the two mode frequencies of the fabricated stator. In experiments, the dependences of the two mode frequencies and their difference on DC magnetic fields are all investigated. The experimental results indicate that the difference between the longitudinal and bending mode frequencies of the PZT/Terfenol-D/PZT composite stator can be tuned by changing the intensity of the external DC magnetic field.

Key words:

magnetic field| ultrasonic motor| Terfenol-D| frequency difference

摘要：

关键词:

magnetic field| ultrasonic motor| Terfenol-D| frequency difference

CLC Number:

TM 356

LI Chong (李冲), LU Cunyue* (鹿存跃), MA Yixin (马艺馨). Magnetic Field Tuning Characteristics of Bimodal Ultrasonic Motor Stator[J]. Journal of shanghai Jiaotong University (Science), 2017, 22(2): 129-132.

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