Abstract
In this paper, we want to make a new type linear piezoelectric motor by mode shape coating or effective electrode surface coating. The mode shape is derived from the mechanical boundary conditions of the linear piezoelectric motor. We only have access to the first three modes of formas, the effective electrode surface coating basis, as well as with the linear piezoelectric motor of normal shape do comparison. Next, we will inspect their gain or axial velocity through theoretical analysis, simulation and experiment. According to the results of the theoretical analysis, we have found that the gain or axial velocity of the linear piezoelectric motors of mode shape is much larger than the linear piezoelectric motors of normal shape. However, according to the results of simulation and experiments, we have found that the gain or axial velocity of the linear piezoelectric motors of mode shape is much greater than the linear piezoelectric motors of normal shape, which is about 1.2 to 1.4 times. The linear piezoelectric motor of mode shape 3 has the fastest axial velocity, which is about -48 mm/s and 48 mm/s under conditions of 180 Vp-p driving voltage, 21.2 kHz driving frequency (the third vibration modal), 25 gw loading and the position of loading or mass at x = 5 mm & 45 mm respectively. And its axial velocity is about 1.4 times the linear piezoelectric motor of normal shape under the same conditions. Overall, the mode shape coating helps to enhance the gain or axial velocity of the linear piezoelectric motor.
Highlights
Over the past decade, the linear piezoelectric motors have a very significant development and excellent performance, as shown in Table 1 [1]-[19]
2) Shown in Figure 16, we have found that the gain in transverse displacement or velocity of the linear piezoelectric motors of mode shape is much larger than the linear piezoelectric motor of normal shape by theoretical analysis under conditions of the first three vibration modal or driving frequency, 180 Vp−p driving voltage, net weight, frequency spacing of 1 Hz and the first three eigenvalues
3) Shown in Figure 17, we have found that the gain in axial displacement or velocity of the linear piezoelectric motors of mode shape is much larger than the linear piezoelectric motor of normal shape by theoretical analysis under conditions of the first three vibration modal or driving frequency, 180 Vp−p driving voltage, different position of loading or mass, frequency spacing of 1 Hz and the first three eigenvalues
Summary
The linear piezoelectric motors have a very significant development and excellent performance, as shown in Table 1 [1]-[19]. Transducer [15], the ultrasonic linear motor using traveling surface acoustic wave [6] and a linear ultrasonic motor using push-pull type L-B hybrid Langevin transducer with single foot [3] Their linear movement speed of the fastest are 1527 mm/s, 1500 mm/s and 1280 mm/s respectively. If we only pay attention to thrust or loading ability, such as the square matrix type ultrasonic motor [7], a 2-DOF planar ultrasonic motor using longitudinalbending hybrid transducer [5] and aultrasonic linear motor using longitudinal and bending multimode boltclamped Langevin type transducer [1] have the best performance Their maximum thrust or loading are 142N, 103N and 100N respectively. We try to use the same mode shape coating method to produce a new linear piezoelectric motor, and hope the linear piezoelectric motor of mode shape have a more superior performance with respect to the linear piezoelectric motor using normal shape coating, which is our motivation and main purpose in this paper
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