143 results about "Wave motor" patented technology

An impulse-type "wave motor" employs a seabed-mounted or supported structure mounting a wave energy absorbing panel on a hinged lever arm for reciprocation motion to obtain optimal absorption of wave energy from wave motion in the sea. For deepwater wavelengths of L, the panel is optimally positioned in a region within L/2 depth from the sea surface. The panel motion is coupled by a connecting rod to a fluid pump which generates a high-pressure fluid output that may be used to drive a reverse osmosis desalination unit or to produce other useful work. Seawater or brackish water may be desalinated through reverse osmosis membranes to produce water quality for consumption, agricultural, or other uses. The submerged operating environment of the device in a region of one-half the design wavelength provides the maximum available energy flux and forced oscillations. The pump may be of the positive-displacement piston type, plunger type, or multi-staging driver type, or a variable volume pump.

Motion-converter apparatus for converting bidirectional rotary movements to unidirectional rotary movements includes: an input shaft for inputting the bidirectional rotary movements; an output shaft for outputting the unidirectional rotary movements, the output shaft having a longitudinal axis perpendicular to the longitudinal axis of the input shaft; a drive bevel gear coaxial with, and driven bidirectionally by, the input shaft; a pair of driven bevel gears coaxial with the output shaft and meshing with the drive bevel gear on opposite sides of the axis of the drive bevel gear so as to be driven bidirectionally thereby but in opposite directions with respect to the output shaft; and a pair of one-way clutches coupling the driven bevel gears to the output shaft such that both one-way clutches are effective to drive the output shaft only in one direction. Various applications of such apparatus are also described, including wave and tide motors, wind turbines and bidirectional-movement measuring devices.

The invention relates to an ultrasonic wave motor transient characteristic testing device and a control system of the device. The device comprises a base and an ultrasonic wave motor arranged on the base, wherein an output shaft on one side of the ultrasonic wave motor is connected with an optical-electricity encoder, an output shaft on the other side of the ultrasonic wave motor is connected with a flywheel inertia load, an output shaft of the flywheel inertia load is connected with a torque sensor through a coupler, the signal output end of the optical-electricity encoder and the signal output end of the torque sensor are respectively connected to the control system, and the control system is composed of an RNNI and an RNNC. The RNNI completes the identification of the input characteristics and the output characteristics of the ultrasonic wave motor under the different control variables and different flywheel inertia loads, and the RNNC achieves the speed/position/torque control output of the ultrasonic wave motor according to the identified result so as to determine the control dynamic characteristic under the different loads and the different control variables. The device and the control system are high in testing accuracy, simple and compact in structure and good in using effect.

A vibration wave drive device (25) includes an annular piezoelectric element (20) including a piezoelectric material (1) and multiple electrodes provided sandwiching the piezoelectric material (1), the annular piezoelectric element being configured to vibrate by a traveling wave of a wavelength λ; and a power feeding member (8) including at least electric wire (8a) for supplying electric power to the element (20), the feeding member (8) being provided to a first surface of the element (20). The element (20) includes at least two driving regions (15, 16), and a non-driving region (17) arranged between two of the at least two driving regions and has an average annular length of nλ/4, n being an odd number. At least one electrode provided on the first surface is arranged across the region (15, 16) and the region (17), and is electrically connected to the feeding member (8) only in the region (17).

A driving device having a vibration element, a friction member, and a pressing member for applying pressure in a direction in which the vibration element and the friction member make contact with each other, causing the vibration element and the friction member to make a relative movement by vibration generated in the vibration element. The device includes a connection member configured to transmit a driving force caused by the relative movement to a holding member of another member, wherein the holding member makes a movement caused by the transmitted driving force, and a guide member configured to guide the holding member in a moving direction when the vibration element and the friction member make the relative movement. The connection member connects the holding member to the vibration element or the friction member so as not to apply a reaction force caused by the pressing member to the holding member.

Provided is a vibration wave motor including: a vibrator; a pressurizing member configured to pressurize the vibrator against a friction member; a holding member configured to hold the vibrator; and a buffering member provided between the vibrator and the holding member. The vibrator and the friction member are moved relatively to each other in a relative movement direction by vibration of the vibrator, and the holding member holds the vibrator in such a manner that an extending part extending in a pressurizing direction of the pressurizing member sandwiches the vibrator and the buffering member.

A vibration wave motor includes: a vibrating plate having a rectangular surface; a piezoelectric device bonded to the vibrating plate, and configured to vibrate at high frequency; and a projection provided to the vibrating plate or the piezoelectric device. In the vibration wave motor, a natural vibration mode, which has a resonant frequency equal to or adjacent to a resonant frequency of torsional vibration in a natural vibration mode under a state in which the vibrating plate, the piezoelectric device, and the projection are integrated, is a natural vibration mode of bending vibration in a direction parallel to or orthogonal to a torsion center axis of the torsional vibration in the natural vibration mode. The projection is provided at a position closer to an antinode than to a node, which are in the direction orthogonal to the torsion center axis of the torsional vibration in the natural vibration mode.

The present invention provides an obscurity correcting device which can shoot at any condition and uses a vibration wave motor, and a camera using the obscurity correcting device. The number that a deviation exceeds a preset threshold value is counted, wherein the deviation is a difference between a target drive position computed based on the obscure signals detected by an X axis gyroscope sensor (350x) and a Y axis gyroscope sensor (350y) and a position detection value detected in a position detecting sensor (353), if the count result reaches a preset count value, the obscurity correcting device is judged at unsteady state, and Tucom (402) executes control to stop the obscurity correction.

The disclosed ultrasonic wave motor driver without transformer comprises: a SCM pulse signal generation circuit with signal output end connected with the input end of a multi-path isolation drive circuit, multi-path bridge chop circuit with control signal input end connected with the output end of the isolation drive circuit, and a dc boost-up circuit with dc drive voltage output end paralleling the two power ends of chop circuit with the power ground. This invention overcomes defects in current product, and has wide application.

A vibration-wave motor includes a vibrator, a first holding member configured to hold the vibrator, a second holding member configured to hold the first holding member, a plurality of pressing members arranged around the vibrator and configured to press the vibrator against a contacting member that contacts the vibrator, a movable plate disposed opposite to the vibrator with respect to the contacting member, and a coupling part configured to couple the second holding member and the movable plate with each other. The vibrator and the contacting member move relatively to each other due to a vibration generated by the vibrator. One of the second holding member and the movable plate includes a transmitting part configured to transmit a driving force of the vibration-wave motor to a driven member.

A piezoelectric material including a perovskite-type metal oxide represented by the following general formula (1); Bi; and Mn, wherein the content of Bi is 0.1-0.5 mol % with respect to 1 mol of the metal oxide, the content of Mn is 0.3-1.5 mol % with respect to 1 mol of the metal oxide, and the piezoelectric material satisfies (L₄−L₅)/L₅≧0.05 and (L₈−L₉)/L₉≧0.05 when the lengths of twelve Bi—O bonds with Bi that is located at a 12-fold site with respect to O in a perovskite-type unit cell as a starting point are taken to be L₁ to L₁₂ in length order:

(Ba_1-xM1_x)(Ti_1-yM2_y)O₃  (1)

wherein 0≦x≦0.2, 0≦y≦0.1, and M1 and M2 are mutually different metal elements which have a total valence of +6 and are selected from other elements than Ba, Ti, Bi and Mn.

The invention discloses a water bucket type wave motor. The water bucket type wave motor comprises a rotor and water buckets, wherein the rotor is cylindrical or annular, the water buckets are evenly distributed at the external circle of the rotor in the peripheral direction, each water bucket is of a water tank structure, openings of the water buckets are sequentially arranged along the periphery, the axis of a rotor shaft is slightly higher than the water surface and is parallel with the water surface, and the axis of the rotor shaft is roughly parallel with the bank. A one-way valve is installed on the lateral wall of each water bucket and corresponds to the opening of the corresponding water bucket, water can only enter through each one-way valve, and a water outlet is near the outer side of the bottom surface of each water bucket. Each water bucket is simple in structure, low in manufacturing cost and high in reliability. Due to the fact that the water bucket type wave motor directly collects and utilizes the potential energy of waves and floating force of water to drive the water buckets on the rotor to move for power generation, the wavy energy does not need a middle conversion procedure, and the utilization rate is high. If the geometric size of each water bucket is designed to be small, small broken waves can also be utilized.

The invention discloses an indexing mechanism of an ultrasonic wave motor based high-precision miniaturized fiber optic gyroscope north finder. According to the invention, the indexing mechanism of the fiber optic gyroscope north finder is designed by adopting a precise driving technique, and an ultrasonic motor is introduced for the first time to design the brand new indexing mechanism to replace the traditional complex mechanical type indexing mechanism and a locking mechanism, so that the structure of the indexing mechanism can be simplified greatly; the fiber optic gyroscope north finder formed by adopting the indexing mechanism can greatly reduce the size and weight of the north finder under the condition of not reducing the north finding precision, and fill the miniaturization and light weight technical blanks of the current indexing mechanism of the high-precision north finder.

A vibrational wave motor which can realize a suitable drive performance and can be driven quietly.

A vibrational wave motor having: an electromechanical-conversion element excited by a driving signal; a vibrating element joined with the electromechanical-conversion element, and having a drive surface where a progressive vibrational wave is generated by the excitation; a relative motion member having a sliding surface pressure-contacting the drive surface of the vibrating element, and which is driven by the wave; and a driving device for providing the driving signal to the electromechanical-conversion element, wherein: the driving device provides the driving signal to the electromechanical-conversion element, the driving signal generating the wave satisfying a-value/λ≦0.00025 in the drive surface, where a vibration amplitude generated in the drive surface of the vibrating element is a-value, and a wavelength generated in the drive surface of the vibrating element is λ.

The present invention discloses HF inducing motor and its speed controller. Conducting winding is set in motor rotor and stator, and the rotor winding is connected to capacitor to form resonant loop.When HF alternate current is led into the stator winding, current will generate in the rotor by means of electric induction and electromagnetic resonance and interect with stator magnetic field to rotate motor to solve the friction problem of ultrasonic wave motor. The motor of the present invention can detect its rotation speed via stator winding. The low frequency component in winding voltage or current has frequency proportional directly with the rotation speed and is used in controlling and displaying rotation speed. The present invention also provides motor speed controller comprising simple analog and digital circuit.

A vibration wave motor includes a vibration plate having a flat plate portion and protruding portions, a piezoelectric element that performs high-frequency vibration, a friction member contacting the protruding portions, and a first natural vibration mode and a second natural vibration mode, which are excited in the vibration plate by the high-frequency vibration, the vibration plate and the friction member moving relatively to each other, maximum amplitude generated on tip ends of the protruding portions by the first natural vibration mode is larger than maximum amplitude generated on tip ends of the protruding portions by the second natural vibration mode, a resonance frequency of the first natural vibration mode is lower than a resonance frequency of the second natural vibration mode, and amplitudes of the first natural vibration mode and the second natural vibration mode in a frequency range at a time of drive substantially coincide with each other.