Read e-book online Ultrasonic motors : technologies and applications PDF

By Chunsheng Zhao

A entire educational on ultrasonic cars for practising engineers, researchers and graduate scholars. "Ultrasonic automobiles: applied sciences and purposes" describes the working mechanism, electromechanical coupling types, optimization layout of structural parameters, checking out tools, and drive/control recommendations of assorted ultrasonic cars and their applications.

Dr. Chunsheng Zhao is a professor at Nanjing college of Aeronautics and Astronautics (NUAA) the place he's Director of the Precision riding Laboratory at NUAA. he's a member of the chinese language Academy of technological know-how, and holds fifty four patents in China and released greater than four hundred papers within the box of piezoelectric ultrasonic motors.

 

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Based on longitudinal vibration The motor based on the longitudinal vibration mode belongs to the standing wave motor. This kind of motor uses the Langevin vibrator with high converting efficiency from electrical energy to mechanical energy. However, the abrasion of the friction material on the contact surface is serious. The first standing wave ultrasonic motor proposed by Sashida bclongs to this kind of motors. The longitudinal vibration of the stator in one direction can be transformed into the rotating motion of the rotor through the deformation of the flexible sheet.

1 13 Introduction Load Characteristics Figure 1. 20 shows the comparison of the load characteristics (measured) of DC motor with USM. It can be seen that when DC motor approaches the no-load speed. its efficiency is maximum and output torque is smaller. On the contrary. the ultrasonic motor's efficiency is maximum in conditions of the lower speed and higher torque. Therefore, USM is suitable for operating at low speed and high torque. and can directly drive loads. "!. "!. 20 Output lorque I(N 'm) (b) Ullrasonic motor Fig.

This kind of motor uses the Langevin vibrator with high converting efficiency from electrical energy to mechanical energy. However, the abrasion of the friction material on the contact surface is serious. The first standing wave ultrasonic motor proposed by Sashida bclongs to this kind of motors. The longitudinal vibration of the stator in one direction can be transformed into the rotating motion of the rotor through the deformation of the flexible sheet. In 1998, Kurosawa proposed a linear ultrasonic motor with higher drive efficiency using the composite mode of two longitudinal vibration1l6 -.

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