摘要:
The invention relates to a method for activating a linear or rotary multi-actuator drive device having a stationary and a moving part, wherein the relative movement between the stationary and the moving part is generated via actuators having limited strokes, which are in permanent frictional contact to the moving part, either directly or via a force-transferring mechanism, wherein temporally offset actuation signals are used therefor that force an alternation between glide and adhesion phase for each actuator. According to the invention, speed fluctuations and vibrations of the device are reduced or prevented by utilizing the elasticity within the components of the drive in that suitable mechanical tensions are built up between the friction points by actuation cams for the various actuators adapted to the respective situation, which give priority to preventing an undesired variation in the force of the actuators on the movable part at a transition of an actuator from the adhesion phase into the glide phase or at the direction reversal of a single or multiple actuators.
摘要:
A conversion element 20 includes first to fifth portions 21 to 25. The first portion 21 is located above a first side surface 10c. The first portion 21 includes a convex portion 21a spaced from the first side surface 10c. The second portion 22 is connected to the first portion 21. The second portion 22 comes into contact with a first end surface 10a. The third portion 23 is connected to the first portion 21. The third portion 23 comes into contact with a second end surface 10b. The fourth portion 24 is connected to the second portion 22. The fourth portion 24 is fixed to a second side surface 10d. The fifth portion 25 is connected to the third portion 23. The fifth portion 25 is fixed to the second end surface 10b.
摘要:
The invention relates to an actuator, preferably having piezoelectric material, in the form of a single-layer or multi-layer flat plate, wherein at least one layer has two electrodes spaced from each other by means of a separating area and arranged opposite each other both on the upper face of the at least one layer and on the lower face of the at least one layer, and the electrodes of the upper face are arranged at an offset from the electrodes of the lower face. The invention further relates to a motor, comprising the actuator according to the invention and a movable element to be driven by means of the actuator.
摘要:
The invention relates to a fine positioning system using an inertial motor based on a mechanical amplifier, that comprises a first amplified inertial sub-assembly (20) including a mechanical amplifier (1), a piezo-active member (2) and a counter-mass (3). A second relative drive sub-assembly (21) includes a clamp (15) and a clamped member (24) attached to the first amplified inertial sub-assembly (20). Asymmetric excitation cycles of the first inertial sub-assembly generate impact forces and movements amplified in a driving direction (z), thus resulting in sliding and adhesion successions of the clamped member in the clamp in order to generate a relative translation movement of the points A and B relative to the point D. The mechanical amplifier (1) increases the step size and reduces the supply inrush currents. Fine and dynamic positioning of the point B relative to the point D can be achieved with augmented strokes using the amplifier (1).
摘要:
A driving apparatus comprises an actuator, the actuator comprising an electromechanical conversion element and a driving shaft attached to the electromechanical conversion element, wherein the driving apparatus expands and contracts-the electromechanical conversion element by applying a driving signal to the electromechanical conversion element and reciprocally moves the driving shaft in accordance with expansion and contraction movement of the electromechanical conversion element so as to move a driven member frictionally engaged with the driving shaft, and wherein the driving signal is a pulse signal, and a time period corresponding to a half wavelength of a damping vibration displacement of a lowest resonance frequency in the actuator is set as a shorter output time among a high output time period and a low output time period of the driving signal.
摘要:
A driving device (20) includes an electro-mechanical transducer (441) having first and second end portions (441 a, 441b) opposite to each other in an expansion/contraction direction, a stationary member (442) coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion (443) coupled to the second end portion of the electro-mechanical transducer, and a moving portion (423) frictionally coupled to the vibration friction portion, whereby moving the moving portion (423) in the expansion/contraction direction of the electro-mechanical transducer (441). The moving portion (423) is driven by equalizing a constant expanding speed (Ve) of the electro-mechanical transducer (441) with a constant contracting speed (Vc) of the electro-mechanical transducer (423) and by setting a constant rest time interval (Ts) after one of contraction of the electro-mechanical transducer (441) and expansion of the electro-mechanical transducer (441).
摘要:
A driving device (20) includes an electro-mechanical transducer (441) having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member (442) coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion (443) mounted to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion (423) frictionally coupled to the vibration friction portion, whereby moving the moving portion (423) in the expansion/contraction direction of the electro-mechanical transducer (441). The vibration friction portion (443) is made of a material having a vibration transfer rate of 4900 meters/second or more. The moving portion (423) is made of a material which has a vibration transfer rate of 4900 meters/second or more and which is different from that of the vibration friction portion (443).
摘要:
Linear and rotational inertia drive devices having a friction body which is temporarily deformed due to the strong accelerations which are typical of inertia drives, in such a way that the deformation acts on the friction faces so that the contact pressing force which substantially determines the running properties of the inertia drive changes during the movement.