Abstract: An exemplary ultrasonic motor includes an ultrasonic actuator, functioning as a waveguide resonator, formed as a rectangular piezo-electrical plate having two main surfaces and side surfaces that join the main surfaces together, an element to be driven and an electrical excitation device. At least one friction element is arranged on at least one side surface of the ultrasonic actuator and is in frictional contact with the element to be driven. The piezo-electrical plate is divided into three parts. The central part forms a generator for an acoustic longitudinal standing wave, and the peripheral parts bordering the central part form generators for an acoustic bending standing wave. Each generator is electrically connected to the electrical excitation device-can be electrically controlled, and can be divided into two equally-sized and electrically individually controllable sub-generators.
Abstract: A vibration actuator includes a roller, a vibrating element having a contact portion that is in contact with the roller, a vibrator for vibrating the vibrating element, a pressing device for pressing the roller against the vibrating element, and a lubricator disposed close to the contact portion and in contact with the roller.
Abstract: According to one embodiment, an ultrasonic motor unit includes a piezoelectric element, a holder member, a pressing member, a pressing auxiliary member, a driven member, an ultrasonic motor accommodation member, a power extraction member. The piezoelectric element has a rectangular cross-sectional shape. The holder member holds the piezoelectric element so as to cover an outer surface of a portion of the piezoelectric element. The pressing member applies a predetermined pressing force to the piezoelectric element. The pressing auxiliary member transfers a pressing force generated by the pressing member to the holder member. The driven member is in contact with one end face of the piezoelectric element. The power extraction member is coupled to the ultrasonic motor accommodation member to form a joint portion. The ultrasonic motor unit is formed by connecting a plurality of sections each formed by coupling the ultrasonic motor accommodation member to the power extraction member.
Abstract: A drive unit includes: a shaft; a movable body supported by the shaft so as to be displaceable along the shaft; a vibratory actuator configured to drive the movable body; and a support body configured to support the vibrator actuator. The vibratory actuator includes an actuator main body that contacts the movable body and is configured to vibrate to output a driving force to the movable body, an opposing member that contacts the movable body and is positioned so as to face the actuator main body with the movable body interposed therebetween, and a coupling member that is configured to couple the actuator main body with the opposing member and to bias the actuator main body and the opposing member so as to sandwich the movable body therebetween with the movable body kept displaceable along the shaft. The support body supports the vibratory actuator so that the vibratory actuator is displaceable along a biasing direction of the coupling member.
Abstract: A piezoelectric motor includes a piezoelectric element; a stator comprising a first surface and a second surface, wherein the piezoelectric element is disposed on the first surface and a plurality of projections are formed on the second surface; a rotor comprising an operating portion that contacts the plurality of projections and that rotates via waves of the stator generated by the piezoelectric element, wherein a part of each of the plurality of projections that contacts the operating portion comprises a curved contact portion.
Abstract: A linear drive ultrasonic motor includes at least an ultrasonic vibrator having a piezoelectric element, a driven member which is driven relatively by a frictional force between the ultrasonic vibrator and the driven member, a plurality of coupling members which are coupled with the driven member, a frame body which is coupled with the coupling member, a bias applying member which applies a bias to the driven member by the ultrasonic vibrator, a base member which movably supports the driven member, and a rolling member having a spherical shape which movably supports the driven member with respect to the base member. The plurality of coupling members include a positioning portion which determines a position of the respective frame body, and which have a shape which enables to fix by a point contact, sandwiching the frame body.
Abstract: An ultrasonic motor mechanism includes an ultrasonic vibrator that includes a piezoelectric element; a driven member that is driven relative to the ultrasonic vibrator because of a frictional force generated between the ultrasonic vibrator and the driven member; a coupling member that is coupled to the driven member; a first urging member that urges the ultrasonic vibrator with the driven member; a base member that movably supports the driven member; and a spherical rolling member that movably supports the driven member with respect to the base member. By interposing a second urging member between the driven member and the coupling member, the driven member is urged in a longitudinal direction. The driven member and the coupling member are coupled to each other by causing the driven member to abut the coupling member.
Abstract: A friction drive actuator, comprising: a vibration member which is configured to be driven to vibrate by expansion and contraction of a piezoelectric displacement portion which is included in the vibration member and driven by a driving signal; a sliding member which is in contact with the vibration member and is driven by the vibration member in a first direction with respect to the vibration member; a pressing member which causes the vibration member and the sliding member to come into a pressure contact therebetween; and a control member which is provided on each of the vibration member and the sliding member at a contact portion therebetween for controlling a relative movement of the sliding member with respect to the vibration member in a direction perpendicular to the first direction when the vibration member and the sliding member are pressedly contacted with each other by the pressing member.
Abstract: An ultrasonic motor drive apparatus comprises a piezoelectric element 107 having a plurality of piezoelectrically active regions, in which longitudinal vibration and flexural vibration are induced with application of alternate signals to the plurality of piezoelectrically active regions, a piezoelectric element holder 108 that is fixedly attached to the piezoelectric element, covering the neighborhood of a common node of the longitudinal vibration and the flexural vibration induced in the piezoelectric element all along the circumference of the central portion of the piezoelectric element with respect to the longitudinal direction, a vibrator holder 103 having a plurality of openings, a driven member 104 having a substantially spherical shape, an output shaft 106 attached to the driven member, through which power output of the driven member is transmitted, a pressing member 102 that brings the driven member 104 and the piezoelectric member into pressure contact with each other along the third direction, a cap
Abstract: A linear drive ultrasonic motor includes at least an ultrasonic vibrator having a piezoelectric element, a driven member which is driven by a frictional force between the driven member and the ultrasonic vibrator, a pressing member which presses the ultrasonic vibrator such that a frictional force is generated between the ultrasonic vibrator and the driven member, a guiding mechanism which movably supports the driven member, and a case member which accommodates the ultrasonic vibrator, the pressing member, and the guiding means. The case member includes a first opening portion for making the driven member pass through, and a second opening portion which opens in a direction different from a direction in which the first opening portion opens and a direction of pressing by the pressing member.
Abstract: The piezoelectric actuator includes a piezoelectric element structure (100) which has at least one piezoelectric element (120), and a working edge (130) for directing driving force on a driven body (MB), wherein the working edge (130) oscillates in response to deformation of the piezoelectric element (120). The piezoelectric actuator further includes a driver circuit (300) for applying voltage to the piezoelectric element (120); and a drive control circuit (200) for inducing oscillation of the working edge (130) by supplying a drive signal (DV, #DV) of rectangular waveform to the driver circuit (300). The drive control circuit (200) is capable of reversing the drive direction of the driven body (MB) by changing the duty ratio of the drive signal (DV, #DV).
Abstract: A vibrator (3) is sandwiched between a base block (1) and a stator (2), and a substantially lower half of a substantially spherical rotor (6) is received in a recess (5) of the stator (2). A support member (7) is placed on an upper portion of the stator (2). A preload portion (10) is supported at an end of an angle portion (9) of the support member (7). A spherical member (11) rotatable about multiple axes of the preload portion (10) abuts against a top portion of the rotor (6) to apply a preload to the rotor (6). Driving the vibrator (3) rotates the rotor (6), whereby an output shaft (12) is moved between the preload portion (10) and an annular portion (8) of the support member (7) as a movable range.
Abstract: An ultrasonic actuator (3) includes an actuator body (4) performing a plurality of vibrations including a bending vibration, and a driver element (5) which is attached to a long side surface (40b) of the actuator body (4), and outputs a driving force by making an orbit motion in response to the vibrations of the actuator body (4). The driver element (5) is provided with an attachment surface (51), and is attached to the long side surface (40b) with the attachment surface (51) in surface contact with the long side surface (40b). A width of the attachment surface (51) in the longitudinal direction of the long side surface (40b) is smaller than a maximum width of the driver element (5) in the longitudinal direction of the long side surface (40b).
Abstract: A one-way rotational transfer mechanism includes a rotary input member; a holding member including an axially orthogonal surface to the axis; a hollow-cylindrical rotary output shaft positioned coaxially around the rotary input member to be rotatable relative to the rotary input member, and including a cylindrical inner peripheral surface; a circumferential guide groove formed on the rotary input member; and a torque transfer ball installed between the axially orthogonal surface, the cylindrical inner peripheral surface and the circumferential guide groove, to roll on and be held between the axially orthogonal surface and the circumferential guide groove. The circumferential guide groove is shaped to make the torque transfer ball revolve around the rotary input member in a same direction as the rotary input member while trailing therebehind and to make the torque transfer ball press against the cylindrical inner peripheral surface when the rotary input member rotates.
Abstract: A piezoelectric ultrasonic motor includes a piezoelectric stator including a hollow metal tube having a quadrangular cross section and four piezoelectric elements each installed in each outer face of the metal tube; a rotary shaft including a rotation bar inserted into an inner space of the metal tube, an upper rotation member provided around the rotation bar in contact with an upper surface of the piezoelectric stator, the rotation member rotating in response to the strain of the piezoelectric stator, a lower rotation member adapted to restrain the rotation of the rotation bar and contacting a lower surface of the piezoelectric stator and a power transmission member provided at one portion of the rotation bar to transmit the rotation of the rotation member to an object to be transported; and a power supply to apply a supply voltage necessary for the actuation of the piezoelectric stator.
October 23, 2009
Date of Patent:
November 16, 2010
Samsung Electro-Mechanics Co., Ltd.
Byung Woo Kang, Burhanettin Koc, Jung Ho Ryu, Sang Min On, Dong Kyun Lee
Abstract: An actuator for moving a tool is disclosed, comprising a housing in which a tappet carrying a tool holder is guided axially movable, wherein the tappet is movable by means of a fast drive, e.g. by a piezo drive or by a nanotube drive, which is biased against a restoring force and which is dampened by a dampening element. Herein the fast drive may at least partially be received within a recess of the tappet which leads to a very compact design, in particular in combination with a coaxial dampening element. For guiding the tappet in axial direction alternatively a roller guide may be used (FIG. 3).
Abstract: A piezoelectric motor that allows movement of an arbitrary object in an arbitrary direction is described. The piezoelectric motor includes at least two piezoelectric drives positioned to direct energy at an angle to each other. A contact element translates the energy from the piezoelectric drives to an object, thereby moving the object in the desired direction.
Abstract: An ultrasonic motor of the present invention has a vibrating element 6. The vibrating element 6 includes a first piezoelectric element 62 that undergoes extension and contraction by application of an AC voltage, a reinforcing plate 63 having a contact portion 66 and an arm portion 68, and a second piezoelectric element 64 that undergoes extension and contraction by application of an AC voltage. The first piezoelectric element 62, the reinforcing plate 63, and the second piezoelectric element 64 are laminated in this order. The vibrating element 6 is fixedly mounted through the arm portion 68 so that the contact portion 66 abuts on a driven element (rotor 51). Further, the vibrating element 6 has a body portion and a length L of the body portion in a direction in which the vibrating element 6 extends and contracts by application of the AC voltage is 1 to 20 mm.
Abstract: A rotation/displacement converting actuator has an actuator unit constituted by a displacing body and an actuator in which the displacing body can be linearly displaced. The actuator has a pair of plate-shaped bases, a rotor, a vibrating element that rotates the rotor, and a cam mechanism for converting rotary motion of the rotor to linear motion of the displacing body. The rotor is fixed to a shaft to which the rotor (cam rotor) is fixed. An outer circumferential surface of the rotor constitutes a cam surface of the cam mechanism. A roller is provided at a tip portion of the displacing body. The roller abuts on the outer circumferential surface (cam surface) of the rotor.
Abstract: A linear actuator is an actuator for directly driving (moving) a slider. The linear actuator has an actuator unit constituted by the slider and an actuator body on which the slider is movably provided for linear movement. The actuator body has a base, a vibrating element for moving the slider, two rollers to movably support the slider, pushing means for pushing the vibrating element into contact with the slider, and a conducting circuit for conducting each of electrodes of the vibrating element by selecting a conducting pattern to each of the electrodes. Grooves are respectively formed in outer circumferential surfaces of the rollers, and the slider is arranged inside each of the grooves.
Abstract: The application seeks to eliminate errors introduced by bearings and supports. It does so by integrating the drive means, in the form of a piezoelectric actuator, into the bearing or support. Thus the bearing no longer acts against the drive means, eliminating errors. It also describes a drive mechanism for elongate prismatic objects (140). The mechanism uses piezoelectric drives (148) and achieves very high accuracy of positioning with minimal backlash etc, whilst occupying only a small volume. This makes it suitable for use in electro-discharge machining and electro-discharge texturing operations where one or more wire electrodes (140) need to be positioned accurately with respect to a workpiece and maintained in that relative position as the workpiece erodes and the electrode (140) is consumed.
February 12, 1999
Date of Patent:
July 17, 2001
Intelligent Manufacturing Systems Limited