A MEMS actuator device of a piezoelectric type formed on a substrate, with a base unit including a base beam element having a main extension in a extension plane and a thickness in a thickness direction perpendicular to the extension plane, smaller than the main extension. A piezoelectric region extends over the beam element. An anchor region is rigid to the base beam element and to the substrate. A base constraint structure is connected to one end of the base beam element and is configured to allow a deformation of the base beam element in the extension plane and substantially reduce a deformation of the base beam element in the thickness direction.

A simple rugged motor has a stator and a rotor formed by stacked silicon steel sheets operates by having a plurality of major and minor coil windings of the stator individually electrified under signals of a control unit, so as to steadily drive a rotor thereof. The simple rugged motor further has an orbit coupling balance assembly engaging an orbiting scroll for a corresponding fixed scroll disposed in a compression chamber to orbit for air compression, so as to form a scroll compressor. Or the simple rugged motor has a coupling assembly engaging a female screw compressor rotor to compress the air by a rotatable male screw compressor rotor disposed in a compression chamber, so as to form a screw compressor.

A transducer device using an electroactive polymer is provided. The transducer device has a predetermined driving direction and includes: a laminate of elastomer actuators that is disposed so as to be inclined at a predetermined angle with respect to the driving direction and has a stretchable elastomer and a following electrode; and a fixed frame unit and a drive frame unit that support the laminate. The fixed frame unit supports one end of the laminate, and the drive frame unit supports the other end of the laminate, faces the fixed frame unit, and is movable in the driving direction with respect to the fixed frame unit.

An actuator is provided which includes a parallel eccentric gear train, a prime mover having an assembly of piezoelectric elements which drives the gear train and which forms a mechanical amplifier, and a crankshaft which is driven by the parallel eccentric gear train.

A dielectric elastomer driving mechanism includes a driver, a follower, and a power transmitter. The driver includes a dielectric elastomer driving element made up of a dielectric elastomer layer and two electrode layers sandwiching the dielectric elastomer layer. The driver also includes a tension maintaining element maintaining, in a no-voltage state, the dielectric elastomer driving element in a state in which tension occurs, and includes an output portion capable of moving along with the expanding or contracting of the dielectric elastomer driving element. The follower includes a following element actuating in accordance with a driving force inputted. The power transmitter is connected to the output portion of the driver for transmitting a driving force of the driver to the follower.

A positioning device includes a chassis, a plate to be positioned, wherein it further comprises a motor comprising a stator which is connected to the chassis and a rotor,a shaft which is connected to the rotor driven by the motor, which is mobile in rotation relative to the chassis in a first direction and in a second direction opposing the first direction, a first element for the transmission of rotational movement which is configured to be driven in rotation by the shaft in the first direction and to be free in the second direction, a second element for the transmission of rotational movement which is configured to be driven in rotation by the shaft in the second direction and to be free in the first direction, a first connecting rod which is connected to the plate by a first pivot connection and which is connected to the first element for the transmission of rotational movement by a second pivot connection which is offset to the axis of rotation of the first element for the transmission of rotational movement, a second connecting rod which is connected to the plate by a third pivot connection and which is connected to the second element for the transmission of rotational movement by a fourth pivot connection which is offset to the axis of rotation of the second element for the transmission of rotational movement, a connecting element having at least two degrees of rotational freedom between the plate and the chassis.

An actuator including a beam configured to support an object to be driven, and a drive source to which a drive signal is input, wherein the drive signal includes a drive waveform in a shape of sawtooth waveform, a rising of the drive waveform in the shape of sawtooth waveform includes a first staircase waveform and a second staircase waveform continuing from the first staircase waveform, the first staircase waveform generates oscillation of a ringing suppressing waveform for suppressing a ringing waveform to be generated in the second staircase waveform, and the object to be driven is driven to swing in a direction of rotating around the predetermined axis by driving the drive source.

An actuator includes a beam that supports an object to be driven, and a driving source that receives a driving signal and causes the object to rotate around a predetermined axis. The driving signal includes a sawtooth driving waveform, and a differential waveform of a falling section of the sawtooth driving waveform is formed of half sign waves having a wavelength that is a non-integral multiple of a ringing wavelength.

A device for rotating a toothed wheel, including a linear piezoelectric motor including: a passive element having an elongated shape, a piezoelectric actuator capable of axially moving the passive element in a bidirectional manner, a transmission member fastened to the passive element, meshing with a toothing of the wheel in such a way as to rotate the wheel by one tooth in a first direction of rotation when the passive element is moved axially in a first direction of movement, a jumper mobile between two end positions, including a lowered position in which it blocks a rotation of the wheel in a second direction of rotation opposite to the first direction of rotation.

A dielectric elastomer motor includes an artificial muscle and a conversion mechanism cooperating with the artificial muscle. The artificial muscle includes a dielectric elastomer film or layer having a first surface and a second surface opposite to the first surface. First and second electrodes are attached to the first surface and the second surface of the dielectric elastomer film, respectively. First and second bases are attached to the dielectric elastomer so as to be spaced apart from each other. The first base and the second base are capable of reciprocation relative to each other upon change in size of the dielectric elastomer. The conversion mechanism converts the reciprocation of the bases to pivotal or rotational movement. The dielectric elastomer receives voltage application with a predetermined timing via the first and the second electrodes.