研究目的
Investigating the design, classification, and applications of piezoelectric ultrasonic motors (USMs), including their reliability and new developments after 2000.
研究成果
Piezoelectric USMs have been investigated for various applications due to their high torque, light weight, no electromagnetic induction interference, high efficiency, and low-speed operation without a gear mechanism. However, they still face challenges like heat generation, contact mechanics, and the need for high voltage drive. New developments after 2000 include camera module applications, medical uses, and new drive methods of piezomotors.
研究不足
The paper highlights fundamental problems with piezoelectric USMs, such as resonance drive causing temperature rise, rotor and stator contact determining performance and lifetime, friction and wear limiting force transformation, and the need for high frequency, high voltage drive requiring expensive and bulky power supplies.
1：Experimental Design and Method Selection:
The paper discusses various designs of piezoelectric USMs, including traveling wave type, standing-wave type, multi- (or mixed-) mode excitation type, and mode rotation (stepper) type motors. It also covers the piezoelectric elements used in stator vibrators and their reliability issues.
2：Sample Selection and Data Sources:
The study reviews existing piezoelectric USMs and their applications, focusing on designs that have been developed and tested in the field.
3：List of Experimental Equipment and Materials:
The paper mentions the use of piezoelectric ceramic materials, specifically lead zirconate titanate (PZT) based ceramics, and various frictional materials like PTFE, PPS, PBT, and PEEK.
4：Experimental Procedures and Operational Workflow:
The operational principles of different types of USMs are described, including how elliptical motion is generated on the stator surface to drive the rotor.
5：Data Analysis Methods:
The paper reviews the performance and reliability of USMs, including issues like heat generation, contact mechanics, and frictional materials.
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