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Principle and operation of a new type motor consisting of piezoelectric device and strain wave gearing
Author(s) -
Ishida Muneaki,
Hori Takamasa,
Hamaguchi Junichi
Publication year - 1992
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391120314
Subject(s) - piezoelectric motor , universal motor , torque motor , piezoelectricity , switched reluctance motor , torque , ac motor , brushed dc electric motor , direct torque control , control theory (sociology) , ultrasonic motor , motor soft starter , engineering , electric motor , acoustics , mechanical engineering , induction motor , physics , electrical engineering , computer science , control (management) , voltage , artificial intelligence , thermodynamics
The authors have developed a new type of motor consisting of a piezoelectric device and strain wave gearing, and is called a piezoelectric motor. This is a first step in realizing a low‐speed, small‐size and lightweight motor. The principle of the motor is that the traveling wave is produced by piezoelectric devices and displacement conversion devices without mechanical resonance, and the torque to rotate the motor is generated by a mechanism of strain wave gearing (circular spline and flexspline) without using friction. The motor is operated at variable frequency and its rotational position (angle) is controlled in open‐loop because it is basically a synchronous motor. In this paper, the structure and principle of the proposed motor are explained and the driving method and the mechanical characteristics of an experimental motor also are described. The results are as follows: 1 The realizability of the proposed piezoelectric motor is verified experimentally. The experimental motor operates at 2920 steps per revolution, and its speed range is 0 to 960 pps [or 0 to 20 (rpms)]. 2 The torque characteristics are clarified qualitatively. 3 The generated torque of the experimental motor is small (less than 0.03 Nm) and therefore the improvement of the torque is an important subject hereafter. 4 It is possible to construct the motor with nonmetallic material. This fact is considered to facilitate obtaining a means to lighten the weight of the motor in the future.