The contact mechanism of an ultrasonic motor

Rigid contact model of rotor/stator in ring type traveling wave ultrasonic motor without frictional material based on finite element method is proposed in this paper. First, the vibration of the stator is analyzed. Next, the rigid contact model is simulated by finite element method. Subsequently, the contact mechanism of the rotor/stator as well as performance of the ultrasonic motor is studied, and the performance of motors with two different kinds of rotor is compared. It is indicated that contact length of the rotor/stator along circumferential direction decreases from the outer to the inner edge and the stall torque increases and no-load speed decreases with preload force increasing. The result is identified as being useful in designing and analyzing the ultrasonic motor.

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809 A Fundamental Study of a Dynamic Contact Mechanism of an Ultrasonic Motor

The Proceedings of Conference of Hokuriku-Shinetsu Branch ◽

10.1299/jsmehs.2009.46.305 ◽

2009 ◽

Vol 2009.46 (0) ◽

pp. 305-306

Author(s):

Kiyotaka YAMASHITA ◽

Kohro TAKATSUKA ◽

Daichi NAKAJIMA ◽

Tomoyuki OZAWA ◽

Tsuneo AKUTO

Keyword(s):

Dynamic Contact ◽

Ultrasonic Motor ◽

Fundamental Study ◽

Contact Mechanism

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Modeling and validation of preload force effect on characteristics of a V-shaped linear ultrasonic motor

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x211038660 ◽

2021 ◽

pp. 1045389X2110386

Author(s):

Lifeng Zhou ◽

Zhiyuan Yao ◽

Shichao Dai ◽

Ying He ◽

Xiaoniu Li

Keyword(s):

Dynamic Model ◽

Dynamic Behavior ◽

Analytical Model ◽

Dynamic Characteristics ◽

Contact Surface ◽

Dynamic Models ◽

Ultrasonic Motor ◽

Precise Control ◽

Linear Ultrasonic Motor ◽

Contact Mechanism

The traditional dynamic models of linear ultrasonic motor (LUSM) do not consider the influences of the preload force and the roughness of the contact surface of stator/slider on the performance of the motor, which unable to effectively describe the dynamic behavior of the motor. In this paper, a dynamic model is established for a V-shaped LUSM considering the influence of the preload force and the roughness of the contact surface of stator/slider on the dynamic behavior of the motor. The contact mechanism of the stator/slider and the influence of preload force on the stator parameters are studied and analyzed. The effectiveness of the developed model is verified by comparing with the analytical model that ignored the effect of the preload force on the stator parameters. The experimental results shown that the developed model can accurately reflect the dynamic characteristics of the motor, and the model will be helpful for the function prediction and precise control of the motor.

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A Fundamental Study on Dynamic Contact Behavior of an Ultrasonic Motor (Coexistence of Stick and Slip Contact Zone)

Volume 1: 24th Conference on Mechanical Vibration and Noise, Parts A and B ◽

10.1115/detc2012-70358 ◽

2012 ◽

Author(s):

Takafumi Ohnishi ◽

Tomoaki Nakayama ◽

Kiyotaka Yamashita ◽

Kohro Takatsuka ◽

Tsuneo Akuto ◽

...

Keyword(s):

Contact Zone ◽

Numerical Technique ◽

Dynamic Contact ◽

Ultrasonic Motor ◽

The Finite Element Method ◽

Fundamental Study ◽

Contact Behavior ◽

Static Contact ◽

Driving Torque ◽

Contact Mechanism

We discuss the dynamic complex contact behavior between the stator and the liner that sticks to the rotor of an ultrasonic motor. An ultrasonic motor is powered by the vibration of the stator and operated by a frictional force between them. Therefore, it is important to examine the dynamic mechanism of the contact behavior to improve the energy efficiency and durability of the ultrasonic motor. We already proposed a numerical technique using the finite element method (FEM) on the basis of incremental theory to analyze the behavior of the complex contact zone which contains non-contact zone, slip contact zone and stick contact zone in a non-rotating rotor as a static contact problem. In this paper, we expand this numerical technique from a non-rotating rotor to a rotating rotor and propose a numerical technique to analyze the dynamic behavior of this complex contact zone. Moreover, we clear the dynamic contact mechanism and the driving characteristics of the ultrasonic motor such as the dependency of driving torque on the maximum frictional co-efficient.

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