1558 results about "Ultrasonic motor" patented technology

A technology, wherein unstable operation of the ultrasonic motor is prevented, when the ultrasonic motor is driven at the lower speed out of at least two types of speeds, and life extension is attempted, is disclosed, and according to this invention, when the ultrasonic motor 3 is driven at a comparatively low-speed during normal driving, unstable operation due to driving at a comparatively low-speed can be prevented and life extension can be attempted by driving the ultrasonic motor at a comparatively high-speed every predetermined period of time.

Liquid infusion apparatus includes non-magnetic materials in a pumping structure and ultrasonic drive motor therefor, and in a controller that supplies drive signals to the motor to facilitate convenient operation in intense magnetic fields without distorting the magnetic fields and without radiating objectionable radio-frequency interference. A non-MRI-compatible liquid infusion apparatus is temporarily replaced with MRI-compatible, non-magnetic liquid infusion apparatus without disconnecting a patient from an installed intravenous infusion set to continue infusing liquid within the MRI environment. The pumping apparatus operates on a segment of a liquid conduit that is mounted in tension between a linear peristaltic pump and platen, with associated safety interlocks to assure proper operation of infusing liquid into a patient compatibly with conditions in an MRI environment. Drive circuitry generates low-harmonic signals for operating the ultrasonic motor at variable speeds to compensate for flow rate discontinuities through the peristaltic pumping cycles.

An operating apparatus 1 of the present invention has a driven element 5, a frame 4 having a contacted element 51 and rotatably supporting the driven element 5, and an ultrasonic motor. The ultrasonic motor includes 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 on the driven element 5 in a state where the contact portion 66 abuts on the contacted element 51. Further, the vibrating element 6 receives reaction force from the contacted element 51 when the vibrating element 6 vibrates so that the driven element 5 is rotated together with the vibrating element 6 by means of the reaction force.

The invention discloses a K-shaped linear ultrasonic motor based on the theory of a continuous amplitude transformer, belonging to the field of ultrasonic motor. The motor comprises a stator and a rotor; wherein, the rotor is a linear guide way; the stator consists of two Langevin oscillators, center lines of which are crossed; each Langevin oscillator consists of a front end (41), a rear end (61), a piezoelectric ceramic chip (31) and corresponding electrode plates (51); the head parts of the two Langevin oscillators are connected into a whole to form a driving leg (42); the linear guide way and the two Langevin oscillators are arranged in the same plane and form a K-shaped structure. The invention is characterized in that the Langevin oscillators are in the rod structure; the section of the rod is a continuous section that is gradually reduced from the rear end (61) to the front end (41). The linear ultrasonic motor of the invention has the advantages of simple structure, high output power, fast operating speed and high output efficiency.

There is disclosed a piezoelectric element having, on a substrate, a piezoelectric body and a pair of electrodes which come in contact with the piezoelectric body, wherein the piezoelectric body consists of a perovskite type oxide represented by the following formula (1):

(Bi,Ba)(M,Ti)O₃  (1)

in which M is an atom of one element selected from the group consisting of Mn, Cr, Cu, Sc, In, Ga, Yb, Al, Mg, Zn, Co, Zr, Sn, Nb, Ta, and W, or a combination of the atoms of the plurality of elements.

An ultrasound system having a transducer probe unit including at least one transducer for transmitting and receiving ultrasonic signals, wherein the transducer is moved with respect to the probe unit in a repetitive motion by an ultrasonic motor.

The present invention relates to a single-stage zero-current switching driving circuit for ultrasonic motor, which comprises: a buck-boost converter and a zero-current switching resonant inverter. The driving circuit according to the present invention integrates the buck-boost converter and the resonant inverter into a single-stage structure, so that the buck-boost converter and the resonant inverter share an active switch and a trigger signal, and therefore, the circuit is simplified and the loss caused by stage switching is reduced. Moreover, the buck-boost converter operates in a discontinuous-conduction mode (DCM), which allows the circuit to have high power factor, and enables the active switch to be capable of zero-current switching (ZCS), so that the loss caused by switching is largely reduced. In the driving circuit according to the present invention, there's no interaction of power between the buck-boost converter and the resonant inverter, so that the two circuits can be analyzed individually. Therefore, the driving circuit according to the present invention having simplified circuit, low loss caused by switching, and low manufacturing cost, can be a competitive product after being commercialized.

The invention discloses a ternary alloy hyperacoustic motor frictional material of the fire resistance resin modified polyphenyl ester, which solves the low friction coefficient problem, the low impact strength problem, the low abradability problem and the bad processability problem of the prior hyperacoustic motor. The invention is made by 5-25% politef, 5-20% fire resistant resin and the rest polyphenyl, which can also add one or a plurality of 10-35% fortifying fiber, 1-15% metal powder and 1-15% ceramic powder. The invention keeps all the advantages of the present polyphenyl ester plastic alloy hyperacoustic motor frictional material, which is provided with the high friction coefficient, the good abradability, the low noise, the high hardness and the high impact strength.

A vibrator of a beam type linear ultrasonic motor using bending vibration modes belongs to the technical field of piezoelectric ultrasonic motors and is used for the piezoelectric ultrasonic motors. The vibrator solves the problem that the mechanical output capabilities of the ultrasonic motors are restricted because of low tensile strength and low electromechanical coupling efficiency of ceramic materials in the prior art. The vibrator comprises two driving pads, two end covers, two insulating sleeves, two pairs of piezoelectric ceramics with polarization directions being thickness directions, a flange, two thin-walled beams and mounting bases; wherein, studs extend out from the end faces of the flange along the axis of the flange; each stud is sleeved with a pair of piezoelectric ceramics; an end cover is screwed at the overhanging end of each stud; the tail end of each end cover is provided with a driving pad; each piezoelectric ceramic is composed of two symmetrical half piezoelectric ceramics which are combined after being split; the polarization directions of the two half piezoelectric ceramics are opposite; the splitting lines of the two pairs of piezoelectric ceramics at both sides of the flange are vertical to each other; the polarization directions of the piezoelectric ceramics in each pair are opposite.

A medical robot for use inside a magnetic resonance imager includes a horizontal motion assembly, a vertical motion assembly and a controller. The horizontal motion assembly includes a motion joint, an ultrasonic motor operably connected to the motion joint and an encoder operably connected to the ultrasonic motor. The motor and encoder are positioned proximate to the joint of the horizontal motion assembly. The vertical motion assembly is operably connected to the horizontal motion assembly and it includes a motion joint, an ultrasonic motor operably connected to the motion joint and an encoder operably connected to the ultrasonic motor. The motor and encoder are positioned proximate to the joint of the vertical motion assembly. The controller is operably connected thereto and is adapted to be powered off when the magnetic resonance imager is being used to collect images. A medical instrument assembly is connectable to the medical robot.

The ultrasound motor is composed of subassemblies of stator, mover and bracket. The stator consists of stepped cylinder, eight pieces of piezoelectric ceramics (PC), pressing block, support and two driving wheels. Electrodes distributed along circumferencial direction evenly are plated on surface of PC. Mover includes slide block and slide bar. The slide bar is contacted to two drive feet of the stator; and the slide bar is fixed on the bracket. The mover is held between bracket and stator. Through supporting effect, springs and nuts on the bracket provide needed pre-compression between stator and mover. Through different fan-shaped electrodes, the drive signal acts on pieces of PC. Under inverse piezo effect, PCs vibrate to excite a natural vibration of stator so as to realize reciprocating rectilinear motion of slide block of mover. Realizing rectilinear motion in two directions of mover, the motor provides features of large output force and speed, and higher efficiency.

The invention discloses a precise micro-dynamic parallel locating system and method for micro-nano operation environment. The precise micro-dynamic parallel locating system for the micro-nano operation environment comprises a mechanical body, a calibrating device and a control device which are connected in sequence; the mechanical body comprises a pedestal, more than three groups of the same ultrasonic motor drive branched chains and a movable platform; the calibrating device is used for calibrating the actual value of a kinematics parameter, feeding back the movement position of a joint and correcting the original point of the movable platform; the control device is used for processing each module signal, processing correspondingly and driving the mechanical body to move according to a scheduled track. The precise micro-dynamic parallel locating system and method avoid the disadvantages of a traditional electromagnetic motor and reduce the influences of such nonlinear factors as friction and elastic deformation of additional mechanisms and gaps between additional mechanisms, and the precise micro-dynamic parallel locating system is gapless, high in intensity, compact in structure, capable of eliminating assembly error and size error and suitable for the micro-nano operation environment; the precise micro-dynamic parallel locating system and method for the micro-nano operation environment can achieve sub-micron locating precision and millimeter travel and can also be used for macro-micro locating tables.

The invention discloses a screw-thread-driven rotary-linear ultrasonic motor using a columnar stator high-order bending vibration mode, which belongs to the technical field of ultrasonic motors and is used for solving the problem of small output torque during miniaturization of a screw-thread-driven rotary-linear ultrasonic motor using the columnar stator high-order bending vibration mode. The screw-thread-driven rotary-linear ultrasonic motor comprises a screw thread output shaft, a metal tube elastic sleeve and m groups of piezoelectric ceramic sheets, or comprises a screw thread output shaft, a piezoelectric ceramic tube, two metal caps and p groups of outer electrodes. Two mutually orthogonal high-order bending vibrations such as two-order or three-order bending vibration modes on a free stator space are excited, driving travelling waves are generated on the inner surface of a stator driving end consisting of the metal tube elastic sleeve and the m groups of piezoelectric ceramic sheets by laminating and coupling the vibrations, and a stator and the screw thread output shaft are driven through a screw thread pair, so that rotary-linear motion output of the output shaft is realized under the action of axial loading force. The screw-thread-driven rotary-linear ultrasonic motor is taken as a rotary-linear ultrasonic motor.

The invention discloses a novel rotating travelling-wave ultrasonic motor. The ultrasonic motor comprises the following main parts: two stators, a rotor, a pedestal, a friction pad, a check ring, a bearing and the like. The two stators which are in a same shape are symmetrically arranged and compact on two end faces of the rotor. Working faces of the two stators can be parallelly contacted with a surface of the rotor so that a contact surface of the stators and the rotor bears stress evenly. In a current rotating travelling-wave ultrasonic motor based on a single stator structure, radial contact between the stator and the rotor is nonuniform, a contact scope is small, and radial sliding friction losses and other defect are existed in the stator and the rotor. By using the ultrasonic motor of the invention, the above defects can be overcome. A maximum output torque and an efficiency of the rotating travelling-wave ultrasonic motor can be increased and a service life of the rotating travelling-wave ultrasonic motor can be prolonged.

An ultrasonic motor includes a vibrator vibrating in conformity with a frequency voltage. A relative motion member effects relative vibration in conformity with the vibration of the vibrator. The vibrator is adapted to vibrate in a first vibration mode and a second vibration mode vibrating in a direction differing from the first vibration mode. The resonance frequency of the first vibration mode is higher than the resonance frequency of the second vibration mode.

Contact pressures between a driven member and an ultrasonic vibrator are balanced, making the driving characteristics in the forward and reverse directions uniform, and the driven member is driven with high driving efficiency. The invention provides a pressing mechanism of an ultrasonic vibrator for pressing sliding members against a driven member, the sliding members being provided at two or more positions corresponding to antinodes of a standing wave vibration of the ultrasonic vibrator. The pressing mechanism includes a pressing member configured to make contact with the ultrasonic vibrator at two or more positions corresponding to nodes of the standing wave vibration of the ultrasonic vibrator; and pressing-force adjusting units configured to adjustably apply pressing forces, which press the sliding members against the driven member, to the pressing member at two or more separate positions in the direction of a gap between the two or more nodes of the standing wave.

An ultrasonic motor comprises a piezoelectric vibrating member having a detecting polarized portion for detecting a drive signal having a drive frequency of the detecting polarized portion and a driving polarized portion for receiving the drive signal to oscillate the piezoelectric vibrating member in self-excited oscillation to produce a drive force. The detecting polarized portion is disposed at a portion of the piezoelectric vibrating member for undergoing maximum deformation in at least one vibration mode of oscillation of the piezoelectric vibrating member. An amplifying circuit amplifies the drive signal detected by the detecting polarized portion and inputs the amplified signal to the driving polarized portion to oscillate the piezoelectric vibrating member.

The invention discloses a hollow annular traveling wave ultrasonic motor which comprises a base, an outer shell, a rotor, a stator and a piezoelectric ceramic piece, wherein the base, the outer shell, the rotor and the stator are all in a hollow annular structure, the stator is arranged on the outer side of the base, the piezoelectric ceramic piece is adhered to the bottom of the stator, the rotor is arranged on the stator, the bottom of the outer shell is connected with the bottom of the base, and the rotor rotates relative to the outer shell. According to the hollow annular traveling wave ultrasonic motor, a rotating shaft is not needed to output torque, the structure is simple and compact, and hollow parts can be fully utilized.

An ultrasonic motor includes a driven object, a piezoelectric element for driving the driven object, a vibration plate including a notch having an inner peripheral surface of an arc-shaped form having a central angle larger than 180 degrees and being vibrated by the piezoelectric element, and a contact portion made of a material different from that of the vibration plate, having a portion overlapping the piezoelectric element in a plan view and being smaller in thickness than the piezoelectric element, attached to the notch of the vibration plate by press fitting or forced fitting and being in contact with the driven object. Thereby, the ultrasonic motor can have a high shock resistance and a high wear resistance, and can be driven with high efficiency.

The invention discloses a magnetically suspended control moment gyro gimbal and a locking control system. The magnetically suspended control moment gyro gimbal mainly comprises a gimbal moment motor, a locking mechanism, an ultrasonic motor, a locking sensor circuit and a digital signal processor (DSP) and field programmable gate array (FPGA) numerical control device, wherein the DSP and FPGA numerical control device comprises a controller area network (CAN) communication circuit, a command parser, a gimbal controller, a locking/unlocking controller, a gimbal motor power drive circuit, an ultrasonic motor power drive circuit and a gimbal motor sensor circuit; the gimbal controller performs the control of three closed loops and two feed forward according to an angle position, an angle speed, a current command value output by the CAN communication circuit and the command parser and a feedback value output by the gimbal motor sensor circuit to realize high precision and rapid response control of the gimbal moment motor; and the locking/unlocking controller selects the resonance frequency of the ultrasonic motor according to the temperature and an axial displacement value output by the locking sensor circuit and positively and negatively rotates the ultrasonic motor respectively according to locking and unlocking commands so as to lock or unlock the locking mechanism.