scholarly journals Design and Experiment of a Large-Aperture Hollow Traveling Wave Ultrasonic Motor with Low Speed and High Torque

2019 ◽  
Vol 9 (19) ◽  
pp. 3979 ◽  
Author(s):  
Jun Liu ◽  
Zi-Jie Niu ◽  
Hua Zhu ◽  
Chun-Sheng Zhao
Keyword(s):  
Traveling Wave ◽  
High Performance ◽  
Power Transmission ◽  
Ultrasonic Motor ◽  
Vibration Velocity ◽  
Outer Diameter ◽  
Low Speed ◽  
Torque Density ◽  
Aperture Ratio ◽  
High Torque

To realize applications involving low speed and high torque in the high-performance actuator industry, especially in the aerospace field, we propose a novel 70H traveling wave rotary ultrasonic motor (TRUM) with an outer diameter of 70 mm and an aperture ratio of 53% (the ratio between the aperture and outer diameter). The power transmission mechanism between the stator and the rotor is analyzed, and a method for realizing low-speed–high-torque characteristics of TRUMs is proposed. ANSYS software is used to simulate the modal parameters of the stator, and the ratio β between the normal amplitude and the tangential vibration velocity of the stator is proposed. The larger the value of β, the lower the speed and the higher the torque. Furthermore, two prototype motors are fabricated, namely, 70HA and 70HB. Compared with 70HA, the maximum no-load speed of the improved 70HB (50 rpm) is decreased by 23.1% and the maximum stall torque (2.4 N∙m) is increased by 100%. Besides this, with a smaller mass of 210 g and a higher torque density of 11.43 N∙m/kg, 70HB has fundamentally different mechanical characteristics.

scholarly journals Research on Low-Speed Driving Model of Ultrasonic Motor Based on Beat Traveling Wave Theory

Actuators ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 304
Author(s):  
Weijun Zeng ◽  
Song Pan ◽  
Lei Chen ◽  
Weihao Ren ◽  
Xiaobin Hu
Keyword(s):  
Traveling Wave ◽  
Ultrasonic Motor ◽  
Transfer Model ◽  
Motor Speed ◽  
Average Speed ◽  
Periodic Fluctuation ◽  
Variation Trend ◽  
Low Speed ◽  
Driving Model ◽  
Measurement Experiment

This paper proposes a driving method, the superimposed pulse driving method, that can make an ultrasonic motor run at a low speed. Although this method solves the periodic oscillation of speed in a traditional low-speed driving motor, it still has a small periodic fluctuation, which affects the stability of the speed. To reduce the fluctuation rate of the motor speed, the structure model and driving model of the motor are established, based on the theory of a beat traveling wave, and the motion characteristics of the particle point are analyzed in this paper. The simulation curve of the motor speed is obtained according to the stator and rotor contact model and the transfer model. The research shows that the driving method introduced in this paper causes the stator surface to generate a traveling beat wave, and the driving end of the stator generates an intermittent reciprocating vibration and drives the rotor rotation, which is the mechanism of low-speed operation when the driving method is used to drive the motor, as well as the reason for the periodic fluctuation of the motor speed. To improve the speed stability, this paper controlled the output performance of the motor by changing the two control variables—prepressure and frequency difference—and concluded that the variation trend of the average speed and speed volatility were consistent with the variation trend of the motor’s average speed determinant and the speed volatility determinant, respectively, which is verified by the velocity measurement experiment and the vibration measurement experiment. These insights lay the theoretical foundation for the velocity adjustment and stability optimization and, finally, the application of the new driving method is prospected.

A traveling wave ultrasonic motor of high torque

Ultrasonics ◽  
2006 ◽  
Vol 44 ◽  
pp. e581-e584 ◽  
Author(s):  
Y. Chen ◽  
Q.L. Liu ◽  
T.Y. Zhou
Keyword(s):  
Traveling Wave ◽  
Ultrasonic Motor ◽  
High Torque

High torque density low speed permanent magnet machine

2011 ◽  
Author(s):  
Stephane Mouty ◽  
Abdollah Mirzaian ◽  
Frederic Gustin ◽  
Alain Berthon ◽  
Daniel Depernet ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Machine ◽  
Low Speed ◽  
Torque Density ◽  
High Torque

scholarly journals Proposal of C-core Type Transverse Flux Motor for Ship Propulsion – Increasing Torque Density by Dense Stator Configuration –

2014 ◽  
Vol 2 (3) ◽  
pp. 28 ◽  
Author(s):  
Y. Yamamoto ◽  
T. Koseki ◽  
Y. Aoyama
Keyword(s):  
Numerical Study ◽  
Design Method ◽  
Element Analysis ◽  
Low Speed ◽  
Torque Density ◽  
Ship Propulsion ◽  
High Torque ◽  
Transverse Flux ◽  
Effective Use ◽  
Simple Modeling

Electric ship propulsion system has been drawing attention as a solution for savings in energy and maintenance costs. The system is mainly composed of motor, converter and gearbox and required for high torque at low speed. In this situation, transverse flux motors (TFMs) have been proposed to fulfill the low-speed high-torque characteristic due to suitable for short pole pitch and large number of poles to increase torque output. In this trend, we have proposed C-core type motors taking advantage of TFMs’ structure. In this manuscript, a simple design method based on the magnetic-circuit theory and simple modeling of the motor is proposed to search a design parameter for maximizing torque as a pre-process of numerical study. The method takes into consideration the effects of magnetic leakage flux, magnetic saturation and pole-core combination in accordance with the systematic theory. The simple modeling is conducted based on a dense armature structure in previous axial flux motors (AFMs) applied to the new motor design. The validity of the method is verified by 3-D finite element analysis (FEA) and relative error is at most 20%. The minimalist design is shown to be advantageous for effective use in 3-D FEA. As a detailed design by the FEA, high torque density and low cogging to output ratio can be achieved simultaneously in the proposed machine.

Sign in / Sign up

Export Citation Format

Share Document