Abstract:
A rotary ultrasonic piezoelectric motor (10) is provided and a method of exciting a flexure traveling wave to drive the motor. The motor includes a stator (12) having a piezoelectric ceramic disc (16) polarized in the radial direction and bounded by a top electrode (20) and a segmented bottom (22) electrode. The motor also includes a power source (26) for applying two pairs of alternating voltages to the bottom electrode segments to excite a shear-shear mode vibration in the stator, resulting in a shear-shear mode flexure traveling wave in the stator. The motor further includes a rotor (42) operatively connected to the stator, and the stator is driven to rotate through a frictional force between the rotor and the stator due to the traveling wave deformation of the stator. A linear ultrasonic piezoelectric motor and method of exciting a flexure traveling wave to linearly drive the motor is provided. The motor includes a stator having a rectangular piezoelectric ceramic plate that is polarized in the longitudinal direction. The motor also includes a power source for applying two pairs of alternating voltages to the bottom electrode segments to excite a shear-shear mode vibration in the stator, resulting in a shear-shear mode flexure traveling wave in the stator. The motor further includes a slider operatively connected to the stator, and the stator is driven to move linearly through a frictional force between the slider and the stator due to the traveling wave deformation of the stator.
Abstract:
본 발명은 진행파 원리를 이용한 이동체의 추진장치 및 그 방법에 관한 것으로서, 다수개의 구동력을 제공하며 상기 구동력이 시간에 따라 주기적으로 변하도록 제어하되 서로 위상차가 나도록 제어하는 구동부와, 다수개의 가변부재를 연속적으로 배열하고 각각의 가변부재가 구동부에서 제공한 독립된 구동력에 의하여 구동되도록 구성하여 구동부에서 제공하는 다수개의 구동력에 의하여 추진장치가 원하는 형태로 변형되며 구동부의 제어에 의하여 모양이 연속적으로 변형하게 되어 추진장치에 진행파(Progressive Wave)가 구현되고, 구현된 진행파가 진행함에 따라 진행파의 파면이 유체 또는 고정된 물체에 역방향의 힘을 작용하고, 그 반작용에 의하여 추진력이 발생되는 방법을 제공하며, 기존 추진장치의 왕복운동이나 회전운동에 따른 에너지 손실이 제거되어 에너지 효율이 높은 추진장치를 제공하는 효과가 있다.
Abstract:
A rotary ultrasonic piezoelectric motor is provided and a method of exciting a flexure traveling wave to drive the motor. The motor includes a stator having a piezoelectric ceramic disc polarized in the radial direction and bounded by a top electrode and a segmented bottom electrode. The motor also includes a power source for applying two pairs of alternating voltages to the bottom electrode segments to excite a shear-shear mode vibration in the stator, resulting in a shear-shear mode flexure traveling wave in the stator. The motor further includes a rotor operatively connected to the stator, and the stator is driven to rotate through a frictional force between the rotor and the stator due to the traveling wave deformation of the stator. A linear ultrasonic piezoelectric motor and method of exciting a flexure traveling wave to linearly drive the motor is provided. The motor includes a stator having a rectangular piezoelectric ceramic plate that is polarized in the longitudinal direction. The motor also includes a power source for applying two pairs of alternating voltages to the bottom electrode segments to excite a shear-shear mode vibration in the stator, resulting in a shear-shear mode flexure traveling wave in the stator. The motor further includes a slider operatively connected to the stator, and the stator is driven to move linearly through a frictional force between the slider and the stator due to the traveling wave deformation of the stator.
Abstract:
A method for displacing a movable element (3) by means of at least two actuators (4, 5) facing each other on a stator (2). Electrical wave signals are simultaneously applied to at least two actuators facing each other so that oppositely directed waves are generated in the surface of the stator. The two oppositely directed waves form a compound wave in the surface of the stator by means of which the movable element is displaced over a moving area located between the actuators.
Abstract:
La présente invention concerne un dispositif piézoélectrique (1) comportant une plaque flexible (2), au moins trois transducteurs piézoélectriques (3) fixés sur une même face de la plaque (2) et non alignés, et un générateur de tension sinusoïdale (4) générant une tension sinusoïdale et connecté à au moins un transducteur piézoélectrique (3) afin de générer une onde progressive dans la plaque flexible (2), le dispositif piézoélectrique (1) étant caractérisé en ce que la plaque flexible (2) portant les au moins trois transducteurs piézoélectriques (3) est mobile, l'onde progressive générée étant propre à entraîner la plaque flexible (2) en déplacement.
Abstract:
A method of displacing an object (4) located on a carrier (2). In the carrier (2) an acoustic wave (7) is generated by means of a transducer (3). By means of the acoustic wave (7) generated in the carrier (2) the friction between object (4) and carrier (2) is reduced, while the object is displaced by an external force (Fe). The invention further relates to a bearing (1) as well as an assembly of a plurality of interspaced carriers.