31results about How to "No magnetic field" patented technology

The invention discloses a rotary ultrasonic motor, which comprises a screw, a hold-down mechanism, a bearing, a rotor, a stator and a piezoelectric element. The screw is provided with the piezoelectric element, the stator, the rotor, the bearing and the hold-down mechanism in turn. The piezoelectric element, the stator, and the hold-down mechanism are fixed on the screw. One end of the stator adjacent to the rotor is a circular conical surface. One end of the rotor adjacent to the stator is a female conical surface matched with the circular conical surface. The invention also discloses the method to achieve the rotary ultrasonic motor. The motor has the advantages of direct drive, being well controlled, no noise, no magnetic field action and so on, and is in particular applicable for minitype rotary motion devices of small torsion and multi-rotor output.

The embodiment of the invention provides an inductance determination method and device for a permanent-magnet synchronous motor, which can measure the q-axis inductance and the d-axis inductance more accurately and improve the detection precision. The method comprises the following steps: obtaining the first rotating speed of the measured motor, which is controlled by a motor dynamometer to run; in the first rotating speed state, obtaining a first d-axis current, wherein the first d-axis current is the d-axis current obtained through the measurement when a motor controller controls the q-axis current of the measured motor to be zero, and the line voltage of the measured motor to be the first voltage; obtaining a second rotating speed; in the second rotating speed state, obtaining the second d-axis current, wherein the second d-axis current is the d-axis current obtained through measurement when the motor controller controls the q-axis current of the measured motor to be zero, and the line voltage of the measured motor to be the first voltage; according to the first rotating speed, the first d-axis current, the second rotating speed and the second d-axis current, calculating the first d-axis inductance of the measured motor; according to the first d-axis inductance, calculating the first q-axis inductance of the measured motor. The inductance determination method and device, provided the invention, can be applicable to the technical field of detection.

The invention relates to the technical field of film material preparation, and discloses an ion beam assisted deposition system. A plasma cathode electron gun based on pseudo spark discharge is adopted as the ion beam assisted deposition system; unlike a typical ion beam assisted deposition device, the plasma cathode electron gun has multiple electrode gaps, and therefore electron beams for the hollow cathode ionization process and the subsequent conduction ionization process can be effectively generated; the energy and the beam current density of the electron beams of a hollow cathode phase are controller through different breakdown methods, the iron mass resolution is high enough, and therefore ions of hydrogen atoms and ions of hydrogen molecules can be separated; the ion energy is low and ranges from several eV to several hundred eV; the ion beam current is high enough, and therefore it is guaranteed that the ion beam assisted deposition process can be conducted; the ion beam current is wide, the diameter of the beam current is 10 mm, the hydrogen ion current density is 1 microampere per square centimeter, and therefore a deposition experiment can be conducted on a large-area substrate; mass selection on the ions only depends on an electric field and does not depend on a magnetic field, the structure is compact, and therefore the atomic beam current or active gas molecule ion beam current can be effectively controlled.

The present invention is one intelligent torsional oscillation controlling rod based on tile-shaped piezoelectric sheet. On the two ends of the hollow circular rod, connecting blocks are mounted forconnection with other members, and in one end of the rod, there are piezoelectric torsional driver and piezoelectric sensor mounted successively. When one end produces torsional deformation or torsional oscillation relatively to the other end, the piezoelectric sensor detects the signal and the signal is fed to the piezoelectric torsional driver via a reverse amplifier, so that the piezoelectrictorsional driver produces one reverse torsional moment to inhibit the deformation or oscillation. The rod has integrated sensing and driving control functions, and has the advantages of compact structure, good control characteristic, low power consumption, high inhibition effect, etc. and may be used in space robot and other places.

The invention discloses a bistable permanent magnet three-phase circuit breaker, which comprises a base, a casing, a load-side three-phase wire connector and a power supply-side three-phase wire connector, a casing is arranged on the surface of the base, a coil is arranged inside the casing, and a coil is arranged on the surface of the casing. For the upper wiring tube and the lower wiring tube, one side of the shell is provided with a load-side three-phase wire joint, and the other side of the shell is provided with a power-side three-phase wire joint. The upper holding permanent magnet is installed inside the shell, and a power supply is installed next to the upper holding permanent magnet. Side static contact, next to the static contact on the power supply side, there is a lower holding permanent magnet, next to the lower holding permanent magnet, a sliding iron core, under the sliding iron core, a load side moving contact, and next to the load side moving contact, a power supply side contact. The beneficial effect is that: the present invention no longer needs to maintain the electromagnets to consume energy after the state transition, and there is no noise and magnetic field effects that may be emitted when the electromagnets work continuously, and is environmentally friendly and energy-saving, and the switching speed is fast.

The invention discloses a driving-force-controllable four-channel piezoelectric steering engine and belongs to the field of a piezoelectric actuator. Through bending deformation of axial pre-compression simply supported bimorphs, the driving force between a stator and a rotor of the piezoelectric steering gear is changed, thereby realizing independent operation of four rudders. A frame structure formed by four rods attached with ceramic sheets serves as the stator to provide the driving force, which drives the rotor and rudder surfaces to rotate; the piezoelectric bimorphs are arranged betweenthe rotor and a base; and pre-pressure and friction between the stator and rotor are changed by deformation of the bimorphs, so that the problem that when the four rudders are driven by the same stator, the four rudders must act simultaneously is solved, and the four rudders can be controlled separately. The axial pre-compression simply supported bimorphs are utilized as a pre-pressure fine-tuning mechanism to change the driving force between the stator and the rotor; the four-channel piezoelectric steering engine is simple in structure and easy to realize, improves electromechanical conversion efficiency, solves the problem that multi-channel independent actuation cannot be realized since the piezoelectric actuator adopts one stator, and realizes multi-channel independent actuation.

The invention discloses a multi-degree of freedom piezoelectric actuator with built-in stators. The piezoelectric actuator comprises a ball rotor, three stator mechanisms with same structures, an output shaft, a pre-tightening structure, rolling mechanisms, a shell and a base. The three stator mechanisms with same structures are arranged in the ball rotor and are symmetrically distributed around the ball rotor. The three stator mechanisms are arranged at intervals of 120 degrees. The pre-tightening structure provides pre-tightening force for the three stator mechanisms at the same time, so that the pre-tightening force between the three stator mechanisms and the rotor to be uniform. Moreover, when communication signals of certain frequency are provided for three piezoelectric ceramic pieces, traveling waves will be formed at the tooth end on the surface of the stator elastomer. Under the effect of the pre-tightening force, the stators contact closely, through friction effect between the stators and the rotor, the ball rotor is driven to rotate, and a rotation speed and a torque are output through the output shaft. The multi-degree of freedom piezoelectric actuator with the built-in stators provided by the invention has simple and compact structure and high space utilization rate, is not interfered by electromagnetism and can move in multiple degrees of freedom.

The invention discloses a non-magnetic femtosecond electron source device with an adjustable convergence angle. The non-magnetic femtosecond electron source device comprises a vacuum cavity, and a photoelectric cathode, a grid electrode, an anode, an electric convergent mirror and an electric objective lens which are arranged in the vacuum cavity, have overlapped central axes and are sequentiallyarranged at intervals, the photoelectric cathode is used for generating femtosecond pulse electron beams under the excitation of femtosecond laser pulses; a voltage is applied between the photocathodeand the anode for accelerating the electron beam; the voltage of the electric convergent mirror and the voltage of the electric objective lens are adjustable, and the electric convergent mirror and the electric objective lens are used for converging the accelerated electron beams twice to obtain parallel beams or convergent beam electronic pulses with actually required convergence angles. According to the invention, the electric convergent mirror and the electric objective lens are adopted to focus the pulsed electron beam twice, and the voltage of the electric convergent mirror and the electric objective lens is flexible and adjustable, so that pulsed electron beams with different convergence degrees and beam spot sizes can be obtained. Moreover, the size of the electron source device can be greatly reduced by adopting the electrostatic lens, the structure is simple, and the quality, flexibility and controllability of the required electron beam can be further improved.

The invention relates to a variable frequency vibration method capable of shortening response time and a vibration actuator. The vibration actuator comprises a hollow shaft, a vibration output interface and an annular stator elastomer, the hollow shaft is sleeved with the annular stator elastomer, the vibration output interface is fixedly arranged at the top of the hollow shaft through screws, thehollow shaft locks the annular stator elastomer in the axial direction, and meanwhile the annular stator elastomer generates pre-pressure to abut against the vibration output interface; a friction material is laid on the contact surface of the annular stator elastomer and the vibration output interface; and partitioned polarized piezoelectric ceramics are laid on the end face, away from the vibration output interface, of the annular stator elastomer. A plastic wear-resistant sleeve is arranged between the stator elastomer and the hollow shaft, and the plastic wear-resistant sleeve is also arranged on the hollow shaft in a sleeving manner. The problem that a traditional motor is slow in response time can be solved, and the response time of the vibration actuator designed based on the vibration method is greatly prolonged.

The invention discloses a step-down conversion circuit controller over-current detection circuit, which comprises a first control switch, a second control switch, a filter circuit and a comparator, wherein the first end of the first control switch is grounded, and the second end of the first control switch is connected with the input end of the filter circuit and the first end of the second control switch; the second end of the second control switch is connected with the first end of the comparator, the second end of the comparator is grounded, the third end of the comparator serves as a signal output end, the first control switch control end is used for receiving control signals, the second control switch control end is connected with the controllable power supply end VDD, and the filter circuit output end is grounded. The invention provides the step-down conversion circuit controller over-current detection circuit, which is high in precision.

The invention relates to a novel heating material as well as a preparation method and application thereof, and belongs to the field of novel materials. The preparation method comprises the steps of preparing raw materials into primary raw materials, then preparing the primary raw materials into secondary raw materials, soaking the secondary raw materials and a diluted catalyst in a solution, then carrying out first-time roasting, soaking a product obtained after first-time roasting and a low-purity catalyst in the solution, then carrying out second-time roasting, soaking the product obtained after the second roasting and a high-purity catalyst in the solution, and then roasting for the third time. Under the normal temperature condition, the heating temperature of the heating material reaches 520 DEG C, the heating temperature loss is about 4% in the cold environment of -30 DEG C, and 6-8 g of compression energy is in contact with the surface of the heating material to generate atom adsorption collision to generate a high-temperature infrared reactor which can continuously heat for ten hours or above.