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    • 4. 发明授权
    • Method for driving an ultrasonic motor
    • 驱动超声波马达的方法
    • US5644199A
    • 1997-07-01
    • US503512
    • 1995-07-18
    • Takashi NojimaMasanori SumiharaTetsuro OtsuchiTakahiro NishikuraOsamu KawasakiKatsu TakedaKatsumi Imada
    • Takashi NojimaMasanori SumiharaTetsuro OtsuchiTakahiro NishikuraOsamu KawasakiKatsu TakedaKatsumi Imada
    • H01L41/04H02N2/14H02K33/00
    • H02N2/166H02N2/142
    • The present invention relates to a method for driving an ultrasonic motor of the type which includes a vibrator for causing a flexural vibration wave in response to a pair of AC driving voltage signals, and a rotor in contact with the vibrator and moved by the flexural vibration wave. The rotational speed of the ultrasonic motor is controlled by using a feedback signal and a data table, the feedback signal indicating the current rotational speed of the ultrasonic motor, and the data table storing values of the feedback signal as a standard function of the rotational 21 speed. The method includes the step of sampling the feedback signal and detecting the rotational speed in a plurality of rotation states of the ultrasonic motor. The method obtains an approximate function representing the relationship between the sampled feedback signal and the detected rotational speed of the ultrasonic motor, and calculates correction coefficients for adjusting the approximate function to the standard function. The method then controls the rotational speed of the ultrasonic motor by using the feedback signal. In the controlling step, the method corrects the feedback signal obtained from the ultrasonic motor by using the correction coefficient, whereby a value of the approximate function is transformed into a corresponding value of the standard function.
    • 本发明涉及一种用于驱动超声波电动机的方法,该超声波电动机包括响应于一对交流驱动电压信号而产生弯曲振动波的振动器,以及与振动器接触并通过弯曲振动移动的转子 波。 通过使用反馈信号和数据表,指示超声波马达的当前转速的反馈信号和将反馈信号的值作为旋转21的标准函数的数据表来控制超声波马达的转速 速度。 该方法包括对超声波马达的多个旋转状态中的反馈信号进行采样和检测转速的步骤。 该方法获得表示采样反馈信号与检测到的超声波马达的转速之间的关系的近似函数,并计算用于调整与标准函数近似函数的校正系数。 然后,该方法通过使用反馈信号来控制超声波马达的转速。 在控制步骤中,该方法通过使用校正系数校正从超声波马达获得的反馈信号,由此将近似函数的值转换为标准函数的对应值。
    • 6. 发明授权
    • Displacement control actuator
    • 位移控制执行器
    • US5994821A
    • 1999-11-30
    • US978422
    • 1997-11-25
    • Katsumi ImadaTetsuro OtsuchiMasato SugimotoYoshihiro TomitaOsamu Kawasaki
    • Katsumi ImadaTetsuro OtsuchiMasato SugimotoYoshihiro TomitaOsamu Kawasaki
    • H01L41/09H01L41/04
    • H01L41/094
    • Rectangular piezoelectric substrates each of which has main surfaces opposed to each other, measures 50 .mu.m thick by 1 mm wide by 8 mm long, and is made of lithium niobate (LiNbO.sub.3), are directly bonded on the main surfaces so that their axes of polarization are set in directions reverse to each other, thereby composing a piezoelectric element. Electrodes which are 0.2 .mu.m thick and made of chromium-nickel are formed on the two main surfaces of the piezoelectric element opposed to each other, thereby resulting in a precision displacement control actuator of a bimorph type mechanical-electrical converter element. This configuration makes it possible to provide a compact precision displacement control actuator which has a large displacement and extremely small variations of characteristics such as displacement and resonance frequency.
    • 矩形压电基板各自具有彼此相对的主表面,其厚度为50μm厚×1mm×8mm长,由铌酸锂(LiNbO 3)构成,直接接合在主表面上,使得它们的轴线 极化被设置在彼此相反的方向上,从而构成压电元件。 在压电元件的两个主表面上形成厚度为0.2μm,由铬镍制成的电极,从而形成双压电晶片式机电转换元件的精密位移控制致动器。 这种构造使得可以提供一种紧凑的精确位移控制致动器,其具有大的位移和极小的位移和共振频率等特性的变化。