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  • 1
    Online Resource
    Online Resource
    Dielectric Loss in a Piezoelectric Ceramic Transducer under High-Power Operation; Increase of Dielectric Loss and Its Influence on Transducer Efficiency
    IOP Publishing ; 1993
    In:  Japanese Journal of Applied Physics Vol. 32, No. 5S ( 1993-05-01), p. 2418-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 32, No. 5S ( 1993-05-01), p. 2418-
    Abstract: Dielectric loss in a piezoelectric ceramic transducer is related to the vibration, and increases markedly under high-power operation. When PZT ceramics is used over the vibration velocity of about 0.25 (m/s), the dielectric loss becomes larger than the mechanical vibration loss. In this paper, the values of the resistances indicating the dielectric loss and mechanical vibration loss in the equivalent circuit are shown. If an equivalent electric circuit including these resistances is utilized, efficiency of the transducers operating at a high-power level may be calculated with more accuracy. By calculation of the efficiency, the maximum efficiency was obtained at the anti-resonance frequency, not at the resonance frequency. These facts cannot be explained by the ordinary equivalent circuit which does not involve dielectric loss related to the vibration.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.32.2418
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1993
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 2
    Online Resource
    Online Resource
    Ultrasonic Rotary Motor Using Longitudinal and Bending Multimode Vibrator with Mode Coupling Caused by External Additional Asymmetry
    IOP Publishing ; 1993
    In:  Japanese Journal of Applied Physics Vol. 32, No. 9S ( 1993-09-01), p. 4190-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 32, No. 9S ( 1993-09-01), p. 4190-
    Abstract: The present paper deals with the ultrasonic rotary motor using a longitudinal and bending multimode vibrator constructed so that the mode coupling is caused by external additional asymmetry. It is well known that on a rectangular piezoelectric plate vibrator with its two corners cut diagonally or a parallelogram-shaped piezoelectric plate vibrator, the first longitudinal and second bending vibration modes are coupled under a certain dimensional condition. The motor mentioned above is to use this phenomenon; that is, a one-channel drive, reversible rotary motor can be achieved. From results of measurement and calculation of such a trial vibrator, it was found that there were two new resonance vibration modes in the neighborhood of degenerate resonance frequencies of original longitudinal and bending vibrations; hence, the directions of rotor revolution were different at both new modes when the mode-coupled vibrator was used to construct an ultrasonic rotary motor. The trial motor has proven that a simple ultrasonic motor could be easily constructed and it was suitable for light-load use because of its small contact area to the rotor.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.32.4190
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1993
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Improvement in Performance of Longitudinal and Torsional Vibrator Combination-Type Ultrasonic Motor
    IOP Publishing ; 1999
    In:  Japanese Journal of Applied Physics Vol. 38, No. 5S ( 1999-05-01), p. 3342-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 38, No. 5S ( 1999-05-01), p. 3342-
    Abstract: Longitudinal and torsional vibrator combination-type ultrasonic motors in which the torsional vibrator rotates as a rotor have the ability to produce high torque. The purpose of this study is to further improve the performance of this type of motor. The motor was newly designed and improved in regards to the longitudinal vibration mode and the output method of its mechanical power. The longitudinal vibration mode, with one node on each of the longitudinal and torsional vibrators, is applied to control the friction force on the contact surface. This mode can cause repulsive collision of both vibrators. Consequently, the maximum torque and the maximum efficiency of the improved motor increased by 75% and 107%, respectively. Moreover, the input electric power for the longitudinal vibrator was remarkably reduced. Thus, improvement of this type of the ultrasonic motor was successful.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.38.3342
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Rod-Type Ultrasonic Motor Using Two Degenerate Second Flexural Vibration Modes and Characteristic Consideration Using Its Equivalent Circuit Expression
    IOP Publishing ; 1995
    In:  Japanese Journal of Applied Physics Vol. 34, No. 9S ( 1995-09-01), p. 5292-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 34, No. 9S ( 1995-09-01), p. 5292-
    Abstract: This paper deals with a simplified equivalent circuit of an ultrasonic motor and its application to the estimation of motor characteristics. Investigation of this equivalent circuit is conducted from the viewpoint of systematization of research on ultrasonic motors. The equivalent circuit must follow the principle of motor operation and must be expressed simply. We have considered the characteristics of an ultrasonic motor using its equivalent circuit expression. We propose simplified equivalent circuits of a rod-type ultrasonic motor using the two degenerate second flexural vibration modes; moreover, we show that the maximum torque, the suitable load, and power transmission can be easily estimated. As a result, we found that the estimated maximum torque was sufficiently close to the measured one and that the power transmission could be estimated by correction of the measured value of internal resistance.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.34.5292
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Simplified Equivalent Circuit of Ultrasonic Motor and Its Application to Estimation of Motor Characteristics
    IOP Publishing ; 1995
    In:  Japanese Journal of Applied Physics Vol. 34, No. 5S ( 1995-05-01), p. 2752-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 34, No. 5S ( 1995-05-01), p. 2752-
    Abstract: This present paper deals with a simplified equivalent circuit of an ultrasonic motor and its application to the estimation of motor characteristics. Investigation of this equivalent circuit is conducted from the viewpoint of systematization of research on ultrasonic motors. The equivalent circuit must show the principle of motor operation and must be expressed simply. In this paper, we propose simplified equivalent circuits of two types of ultrasonic motors which have different combinations of vibrations used. As a result, it has been proven that these equivalent circuits are similar to each other in spite of the difference in the vibrations used. In this paper, moreover, measurement points of an ultrasonic motor for estimation of its characteristics are clarified.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.34.2752
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Single-Resonance Longitudinal and Torsional Vibrator Combination-Type Motor: Improvement of Motor Characteristics
    IOP Publishing ; 1994
    In:  Japanese Journal of Applied Physics Vol. 33, No. 5S ( 1994-05-01), p. 3075-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 33, No. 5S ( 1994-05-01), p. 3075-
    Abstract: The present paper deals with the single-resonance longitudinal and torsional vibrator combination-type motor, which is one of the ultrasonic motors with a relatively large torque. To improve the characteristics of this motor, the authors studied the calculation method of the resonance frequencies and designed the motor so that the resonance frequencies of the longitudinal and torsional vibrations were very close to the measured ones, because it was thought that the motor characteristics were largely affected by the degree of approximation of the resonance frequencies. Experimental results have proven that the prototype motor produced large torque with a maximum of 14.0 kgf·cm under a total electrical input power of 30 W; this value was 1.5 times as large as that reported previously. That is, it has been clarified that with sufficient degree of approximation of the resonance frequencies, as mentioned above, the output torque of the motor could be greatly improved; however, its efficiency (maximum of 13.1%) was maintained at almost the same value as before.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.33.3075
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Piezoelectric Linear Motors for Driving Head Element of CD-ROM
    IOP Publishing ; 1994
    In:  Japanese Journal of Applied Physics Vol. 33, No. 9S ( 1994-09-01), p. 5365-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 33, No. 9S ( 1994-09-01), p. 5365-
    Abstract: This paper deals with piezoelectric linear motors for driving an optical pickup element of CD-ROM. These linear motors have such merits in that they can be made thin because of their simple construction, and they are suitable for precise positioning owing to their operation principle of using ultrasonic vibrations of essentially very small displacements. We can expect that the input power of these motors will be economized due to their self-position-retention function. Therefore, in order to achieve such linear motors, we have already reported some piezoelectric linear motors of the self-moving type. On the other hand, in this paper, the authors investigated some stationary piezoelectric linear motors which could easily be constructed in a flat shape. Compared with the self-moving piezoelectric linear motors reported previously, the stationary piezoelectric linear motors have the merit that they easily generate a uniform pressing force. In this paper, the structure, operation principles, and characteristics of such stationary linear motors are described, and moreover, a method to lower the driving voltage of these linear motors is reported.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.33.5365
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 8
    Online Resource
    Online Resource
    Ultrasonic Motor Using a Large-Diameter Torsional Vibrator with Slant Slits
    IOP Publishing ; 1995
    In:  Japanese Journal of Applied Physics Vol. 34, No. 5S ( 1995-05-01), p. 2707-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 34, No. 5S ( 1995-05-01), p. 2707-
    Abstract: This paper deals with a large-diameter rod-type ultrasonic motor, in which only the torsional vibration is excited piezoelectrically. This new motor is designed to improve the performance of a relatively high-torque motor by increasing the diameter of the stator vibrator. The characteristic feature of the motor construction is that many slits are cut aslant on the vibrator end-face in contact with a rotor in order to form small slanted cantilever beams; that is, these cantilever beams operate in the bending vibration due to coupling with the main torsional vibration of the stator and lift the rotor in the inclined direction to rotate it. Therefore, this motor operates fundamentally one-way, and thus its advantage is that it is easily driven with a single power source. The first part of this paper concerns the simulated results of an aslant slit torsional vibrator, especially on its slanted cantilever beam, and the second part describes the experimental investigation of the prototype motor.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.34.2707
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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    Online Resource
  • 9
    Online Resource
    Online Resource
    Self-Oscillated Ultrasonic Stepping Motor with Function of Angular Displacement Self-Correction: Nonaxisymmetric ((2,1))-Mode Thin Disk Motor
    IOP Publishing ; 1994
    In:  Japanese Journal of Applied Physics Vol. 33, No. 5S ( 1994-05-01), p. 3054-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 33, No. 5S ( 1994-05-01), p. 3054-
    Abstract: This paper deals with experimental investigation of a self-oscillated open-loop driving motor using a slitted rotor and a nonaxisymmetric ((2,1)) vibration mode thin annular disk which has four projection teeth on its inner circumference. This motor is suitable for application to watches because it can be constructed in a thin configuration and the slitted rotor enables the self-correction of angular displacement. In the experiment, two types of self-oscillation circuits were investigated for suitable driving. The results were that the self-oscillated driving motor could be achieved by using an operational amplifier and some inverter IC elements. That is, the self-correction function of the angular displacement of a stepping motor was confirmed in the case of the nonaxisymmetric-mode disk motor.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.33.3054
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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    Online Resource
  • 10
    Online Resource
    Online Resource
    Experimental Characteristics of a Bolt-Clamped Short-Cylindrical Torsional Vibrator Using Shear Mode Piezoceramics Inserted in the Axial Direction
    IOP Publishing ; 1997
    In:  Japanese Journal of Applied Physics Vol. 36, No. 5S ( 1997-05-01), p. 3126-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 36, No. 5S ( 1997-05-01), p. 3126-
    Abstract: A torsional vibrator using shear mode piezoceramics inserted in the axial direction, developed 20 years ago for use in a mechanical filter exhibits good vibration performance. The authors applied this torsional vibrator to a high-power transducer shaped as a short cylinder with a large diameter. In this case, the torsional vibrator can easily be fabricated by bolt-clamping in the radial direction, and the small number of parts is beneficial to the fabrication. The vibrational characteristics of the torsional vibrator were determined previously using finite element analysis. In this paper, we report the results of a trial fabrication of such a torsional vibrator. As a result, it is clarified that this torsional vibrator exhibits superior vibration performance such that it could be applied to an ultrasonic high-power transducer, and that the torsional and bending vibrations on the disk are easy to couple to each other according to the dimensions of the vibrator.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.36.3126
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
    Location Call Number Limitation Availability
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