35 results about "Rotation field" patented technology

A field-winding type of synchronous machine comprises a stator with an armature winding wound phase by phase, a rotor having a rotor core with a field winding wound, and a circuit enabling an armature current to pass the armature winding, the armature current corresponding to a synchronous current producing a rotation field rotating at an electrical-angle rotation speed agreeing to a rotation speed of the rotor. The synchronous machine further comprises a current suppressor and a current supplier. The current suppressor is connected to the field winging and suppresses, into a unidirectional current, an induced alternating current induced through the field winding in response to the armature current passing the armature winding. The current supplier supplies, phase by phase, to the armature winding a rotor exciting current whose waveform is different from the synchronous current only during a predetermined period of time shorter than one cycle of the synchronous current.

A field generation unit generates a rotating magnetic field including a first partial magnetic field in a first position and a second partial magnetic field in a second position. The first and second partial magnetic fields differ in direction by 180° and rotate in the same direction of rotation. A first detection unit located in the first position has first and second detection circuits whose output signals differ in phase by ¼ the period. A second detection unit located in the second position has third and fourth detection circuits whose output signals differ in phase by ¼ the period. A detected value of the angle that the direction of the rotating magnetic field in a reference position forms with respect to a reference direction is calculated based on a first signal generated from the output signals of the first and third detection circuits and a second signal generated from the output signals of the second and fourth detection circuits.

A field-winding type of synchronous machine comprises a stator with an armature winding wound phase by phase, a rotor having a rotor core with a field winding wound, and a circuit enabling an armature current to pass the armature winding, the armature current corresponding to a synchronous current producing a rotation field rotating at an electrical-angle rotation speed agreeing to a rotation speed of the rotor. The synchronous machine further comprises a current suppressor and a current supplier. The current suppressor is connected to the field winging and suppresses, into a unidirectional current, an induced alternating current induced through the field winding in response to the armature current passing the armature winding. The current supplier supplies, phase by phase, to the armature winding a rotor exciting current whose waveform is different from the synchronous current only during a predetermined period of time shorter than one cycle of the synchronous current.

The invention discloses a particle image velocimetry (PIV) processing method comprising the following steps: A. constructing a level set function phi in an N*M pixel range omega, wherein the level set function phi is a continuous function defined in the N*M pixel range omega; dividing the range omega into a first subregion omega1 and a second subregion omega2 so that a motion field, a divergence field and a rotation field are smoothly connected in the two subregions of omega1 and omega2, but are not continuous on the boundary, wherein a region where the phi is larger than or equal to 0 corresponds to the first subregion omega1, and a region where the phi is smaller than 0 corresponds to the second subregion omega2; B. constructing an energy function E=E1+lambda *E2 of the range omega:, wherein the E is a global energy functional, the E1 is data constraint energy, and the E2 is smooth constraint energy; and C. minimizing the global energy functional to realize the optimal approximation of the motion field, the divergence field and the rotation field. The invention provides the PIV processing method with high precision and good reliability.

A field generation unit generates a rotating magnetic field including a first partial magnetic field in a first position and a second partial magnetic field in a second position. The first and second partial magnetic fields differ in direction by 180° and rotate in the same direction of rotation. A first detection unit detects, in the first position, a first angle that the direction of a first applied field forms with respect to a first direction. The first applied field includes the first partial magnetic field as its main component. A second detection unit detects, in the second position, a second angle that the direction of a second applied field forms with respect to a second direction. The second applied field includes the second partial magnetic field as its main component. A detected value of the angle that the direction of the rotating magnetic field in a reference position forms with respect to a reference direction is calculated based on detected values of the first and second angles.

The invention discloses an efficient mesh fusion method based on a reusable Laplace matrix. The method includes: setting the correspondence between the boundary vertices of the source mesh model and the target mesh model, calculating the local transformation from the boundary vertices of the source mesh to the boundary vertices of the corresponding target mesh, using Laplace operator to calculatethe rotation field and the scale factor field, reusing Laplace matrix to reconstruct the geometric coordinates, and so on. In this method, the interpolation problems of geometric fusion, rotating field and scale factor field are transformed into Laplacian (Poisson) equations, and only one Cholesky decomposition and multiple iterations are needed to obtain eight scalar fields, which is two orders of magnitude faster than the traditional geodesic-based interpolation method. This method can not only obtain the results comparable to the traditional Poisson fusion method, but also significantly improve the efficiency and achieve the speed of real-time response.

The invention provides a method for generating a rotatable optical focal field on the basis of a radiation field of a rotating field antenna. The method is characterized by comprising the following steps: S1, placing a virtual rotating field antenna composed of two dipoles which are perpendicular to each other and have a phase difference of 90 degrees at the center of a focal plane of a 4Pi focusing system, so that an electromagnetic field radiated by the virtual rotating field antenna is completely converged by two opposite high numerical aperture lenses and collimated onto a pupil plane; andS2, focusing two incident fields different for 180 degrees onto the optical focal plane of the two opposite high numerical aperture lenses by virtue of the two opposite high numerical aperture lenses. Intensity distribution of an '8'-shaped optical focal field generated by the method provided by the invention rotates at a circular frequency omega around an optical axis on the focal plane along with time. The rotatable optical focal field has important application value in the aspects of particle rotation, particle acceleration and near-field scanning optical microscopes.

The invention belongs to the technical field of biological control of agricultural pests, and particularly relates to a method for assisting the migration of predatory natural enemies from wheat fields to maize fields. The method of assisting the migration of predatory natural enemies from wheat fields to maize fields is implemented by planting cnidium monnieri zones beside wheat-maize rotation fields, wherein the ratio of the number of rows of wheat zones to the number of rows of cnidium monnieri zones is 40-80:1 or the ratio of the number of rows of maize zones to the number of rows of cnidium monnieri zones is 15-45:1, the wheat zones, the maize zones and the cnidium monnieri zones are uniform, the row spacing of the wheat zones is 18-25cm, the row spacing of the maize zones is 50-70cm,and the row spacing of the cnidium monnieri zones is 33-40cm. The method for assisting the migration of predatory natural enemies from wheat fields to maize fields provided by the invention is efficient and simple, and can increase the income of farmers. Moreover, the seeds of cnidium monnieri will not diffuse into the farmland to interfere with the growth of crops in the farmland, and thus, themethod is of high safety.

A first detection unit has first and second detection circuits. A second detection unit has third and fourth detection circuits. Output signals of the second and fourth detection circuits differ from output signals of the first and third detection circuits in phase, respectively, by an odd number of times ¼ the signal period. The output signal of the third detection circuit differs from the output signal of the first detection circuit in phase by an integer multiple of ⅙ the signal period other than an integer multiple of ½ the signal period. A rotating field sensor generates a first signal based on the output signals of the first and third detection circuits, generates a second signal based on the output signals of the second and fourth detection circuits, and calculates a detected angle value based on the first and second signals.

The invention relates to an operation method of non-sensor of electronic inverting direct-current motor (11) and an electronic driver with the motor (11), an inverter (12) and a control device (16), comprising: confirming zero crossing point of the voltage induced by the rotation field of rotor in phases without supply current; detecting presence of the zero crossing point; calculating moment of the next zero crossing point of voltage induced by the rotation field of the rotor in advance; and at least evaluating the finally detected zero crossing point in the time interval (delta) after the moment calculated in advance.

The invention discloses a method for nutrient emission reduction and crop stable yield maintenance in a vegetable and rice crop rotation field and belongs to the technical field of agricultural non-point source pollution control and crop production. Particularly, in the production process of the vegetable and rice crop rotation field, the effects of vegetable and rice crop rotation field soil runoff nitrogen and phosphorus nutrient emission reduction, crop stable and high yields and commodity character improvement are realized by the aid of the vegetable season appropriate biochar combined application technology and the vegetable season residual phosphorus rice season utilization technology. With the adoption of the technology, the rice crop rotation field soil runoff water nitrogen and phosphorus concentrations are reduced by 20.81% and 50.92% respectively, and the rice whole growing season nitrogen and phosphorus loss amounts are remarkably reduced by 20.81% and 50.92% respectively. Further, with the adoption of the technology, the vegetable and rice crop rotation field nitrogen and phosphorus runoff annual loss amounts are remarkably reduced by 12.88% and 42.24% respectively, and the vegetable and rice crop rotation field nitrogen and phosphorus runoff loss rates are remarkably reduced by 12.28% and 20.88% respectively. At the same time, with the adoption of the technology, the crop high and stable yields can be maintained, the cabbage head sphericity index and the compactness are improved by 1.94% and 2.54% respectively, and the cabbage commodity character is remarkably improved.

The invention provides an analysis method for predicting pneumatic load and movement rules of a reentry process of a booster. According to the method, a three-dimensional unsteady flow field of the reentry process of the booster is carried out, on the basis of a multiple reference coordinate system principle and a sliding mesh technique, a dynamic boundary condition is combined, and analysis of the reentry motion of the booster is carried out. According to the Newton's laws of motion and a theorem of moment of momentum, and user programs used for calculating height, speed, pitch angle speed and other parameters of the reentry process of the booster are written. The user programs can control rotation of a rotation field to achieve pitching motions of the booster, and the physical environment in the reentry process of the booster is simulated through changes of inlet, outlet and far field boundary condition parameters of a static field. In the process that time advance is used for solving the unsteady flow field, a solver calls the user programs in real time, real-time updating of boundary conditions and the rotation speed of the rotation field is achieved, calculation is never stopped until the booster arrives at the ground, and accordingly the transient pneumatic load and the motion parameters of the booster are obtained.

The invention relates to a runoff collecting and nitrogen-phosphorus monitoring system for a rice-wheat rotation system. The runoff collecting and nitrogen-phosphorus monitoring system comprises runoff tanks, collecting barrels, runoff pipes and grid covers, wherein water outlets (7) are formed in the bottoms of the runoff tanks; scales are formed on the walls of the runoff tanks to measure runoff volume roughly; a collecting barrel support (6) is arranged at the bottom of each runoff tank, and used for fixing the corresponding collecting barrel collecting runoff water when the runoff volume is relatively low; one end of each runoff pipe (4) is fixed in the runoff tank, and bent downwards to for conveniently collecting the runoff water; the other side of each runoff pipe is arranged in a rice-wheat rotation field; three water inlets are formed in each runoff pipe; each first water inlet is 5-7 cm higher than the rice field, used for collecting the runoff water during a rice season non-drying period, and covered during other periods; each second water inlet is flush with the surface of the rice field, used for collecting the runoff water during a rice planting soil drying period, and covered during other periods; each third water inlet is formed in the bottom of the corresponding runoff pipe, flush with a corresponding ditch bottom formed by ditching in a wheat season, and covered during other periods; the grid covers are arranged at the exteriors of the water inlets of the runoff tanks; the upper ends of the grid covers are opened; pebbles are paved in the grids.

The invention provides a multidimensional multi-connection integration device. The integration device is mainly suitable for connection between an antenna module and an assembly module. The integration device is formed by a radio frequency cable assembly, a cavity module and a positioning mechanism, is characterized by high density, light weight, modularization, integration and miniaturization, is advantaged by high standardization degree, low production cost, proper connection mode and applicability to rapid motor-driven rotation fields, and is easy to popularize and promote.

The present invention relates to cultivation process during rice seedling transplanting stage in wheat-rice crop rotation field. The cultivation process includes the following steps: low stubble cutting wheat, crushing wheat stubble and spreading crushed wheat stubble in the field; irrigating shallow water layer and shallow rotary tillage; throwing rice seedling; and applying herbicide after the thrown rice seedling stands up.

The essence of the proposed invention is that the action of a rotating electromagnetic field of a stator on the short-circuited turns of a rotor winding extending through areas adjacent to the pole pitch limits of the stator is supplemented by the additional action of a rotating electromagnetic field of the stator on sections of the short-circuited turns of the rotor winding extending through areas adjacent to the limits of a half pole pitch of the stator. The present method and the machine variants based thereon make it possible to provide a machine in which the engine starting current ratio is lower by comparison with machines of the prior art because of the prevention of losses on the braking effect, which makes it possible to increase the starting frequency without load reduction and to use the machine in the most severe operating conditions with an increased load on the shaft, wherein the machine maintains the rotating field effect and can still be fully operational upon the disconnection of one phase, generating in the phase-disconnected winding a high-quality harmonic voltage for the missing phase.

The invention provides a prevention and control method for underground pests in wheat-maize rotation fields with returned straws. The prevention and control method provided by the invention has the advantage that by adoption of a suspended seed coating agent to treat maize or wheat seeds, underground pests can be effectively prevented.

Systems and methods for filtering a continuous beam of ions are provided. An acceleration electric field is applied to a continuous beam of ions using an accelerator to produce an accelerated beam of ions. A field is applied to the accelerated beam to separate ions in time and space using a deflector producing a separated beam of ions. The field applied by the deflector is a rotating field or a circulant rastering field. The rotating field can be a rotating magnetic or electric field. Only accept those ions from the separated beam whose m / z values lie within a range centered around a target m / z value using an aperture. The aperture can include a pinhole aperture in a rotating disk or an annular aperture in a first stationary disk, a second deflector, and a pinhole aperture in the center of a second stationary disk.

The invention discloses a particle image velocimetry (PIV) processing method comprising the following steps: A. constructing a level set function phi in an N*M pixel range omega, wherein the level set function phi is a continuous function defined in the N*M pixel range omega; dividing the range omega into a first subregion omega1 and a second subregion omega2 so that a motion field, a divergence field and a rotation field are smoothly connected in the two subregions of omega1 and omega2, but are not continuous on the boundary, wherein a region where the phi is larger than or equal to 0 corresponds to the first subregion omega1, and a region where the phi is smaller than 0 corresponds to the second subregion omega2; B. constructing an energy function E=E1+lambda *E2 of the range omega:, wherein the E is a global energy functional, the E1 is data constraint energy, and the E2 is smooth constraint energy; and C. minimizing the global energy functional to realize the optimal approximationof the motion field, the divergence field and the rotation field. The invention provides the PIV processing method with high precision and good reliability.

A gaming system provides a game to one or more players and includes a ball lottery machine. The ball lottery machine includes a frame, a lottery ball field, an image projection unit, and a control unit. The lottery ball field has a rotating field. The rotating field includes a plurality of ball pockets spaced on the rotating field. The ball pockets are configured to receive a lottery ball. The rotating field is rotatably coupled to the frame. The image projection unit is coupled to the frame and is configured to project a rotating image into an upper surface of the rotating field. The control unit is configured to establish a rate of rotation associated with the rotating field and to responsively control a rate of rotation of the rotating image using the image projection unit.

The present invention is a super conductor electromagnetic transmitter device. This superconductor takes x amount of electro-magnetic energy waves and concentrates them by expulsion into an extremely powerful non-dissipating enhanced Faraday rotated directional output. This expulsion field, since it surrounds a central point in space because of the inner surface of a tube, is concentrated energy in a small space. Thus, it is impulsive and also induces ultra-Faraday rotation effect. In example, instead of Faraday rotation speed of energy wave rotation, the rotation field is much, much faster because of the superconductive Meissner field.

The invention discloses a sesame no-tillage sowing method in a wheat and ganoderma lucidum rotation mode, which comprises the following steps: 1, normally planting wheat from the middle ten days of October to the middle ten days of May in the next year; 2, in the middle of May, 1-3 days before wheat harvesting, sesame seeds are sprayed with an airplane; thirdly, a harvester is normally used for harvesting wheat, and wheat straw is normally smashed through the harvester; 4, after sesame seedlings emerge, topdressing is carried out after raining, and other management is the same as conventional field planting management; the wheat and ganoderma lucidum rotation field adopts a no-tillage aerial seeding technology, so that the mechanical rotary tillage cost can be saved; (2) the sowing time of the sesame is advanced by about 5 days, and the sesame yield increase is promoted; (3) compacting by a crawler belt of the harvester and covering by the crushed wheat straws to form a good sesame seedling emergence environment, so that the sesame seedlings are orderly, neat and strong; (4) fine topdressing can be carried out according to the growth vigor of the sesame in the later period, and fertilizer and cost are saved.

An ion mobility separator includes an ion path with a central axis along which ions travel, the ion path containing a gas. A first force is applied to the ions in a first axial direction, and a second force that varies spatially along the ion path is applied to the ions in second axial direction opposite the first axial direction. A rotating confinement field has a radially-inhomogeneous electric potential with relative maxima and minima that rotate about the central axis as a function of time, the confinement field exerting a radial confinement force on the ions in a radial direction toward the central axis. The ion mobility separator may be operated at elevated pressures including ambient pressure and higher. The first and / or second axial forces may be a constant or gradient gas flow, a constant or gradient electric field or an axial component of the rotating confinement field.

The present invention relates to cultivation process during rice seedling transplanting stage in wheat-rice crop rotation field. The cultivation process includes the following steps: low stubble cutting wheat, crushing wheat stubble and spreading crushed wheat stubble in the field; irrigating shallow water layer and shallow rotary tillage; throwing rice seedling; and applying herbicide after the thrown rice seedling stands up.

The invention relates to a method, computer program and device for controlling a multiphase rotating field motor. A method (200) for controlling a multiphase rotating field electric machine when current flow to at least one phase of the rotating field electric machine is interrupted includes receiving (220) control parameters for controlling the rotating field electric machine and a direction of rotation of a rotor. The method (200) also includes calculating (230) position parameters corresponding to a plurality of possible rotor positionings of the rotor on the basis of the control parameters. Additionally, the method (200) includes deriving (240) the actual rotor positioning on the basis of the position parameters and the direction of rotation.

An ion mobility separator includes an ion path with a central axis along which ions travel, the ion path containing a gas. A first force is applied to the ions in a first axial direction, and a second force that varies spatially along the ion path is applied to the ions in second axial direction opposite the first axial direction. A rotating confinement field has a radially-inhomogeneous electric potential with relative maxima and minima that rotate about the central axis as a function of time, the confinement field exerting a radial confinement force on the ions in a radial direction toward the central axis. The ion mobility separator may be operated at elevated pressures including ambient pressure and higher. The first and / or second axial forces may be a constant or gradient gas flow, a constant or gradient electric field or an axial component of the rotating confinement field.

Method of field-oriented regulation of a frequency converter for a three-phase AC motor, in which the new position of the rotating field in the motor is adjusted by means of voltage pulses of the stator coil, the rotating field being predetermined by the duration of the voltage pulse and its time offset The amplitude and angle of the vector, the duration and the offset are the result of calculation of the adjustment parameters in the digital control object in the rotor-fixed coordinate system, which are converted into adjustment variables in the stator-fixed coordinate system by inverse transformation , the time point of the voltage pulse edge is obtained from the adjustment parameters in the fixed coordinate system of the stator. The calculation of the adjustment variable in the fixed coordinate system of the stator by the second edge of the voltage pulse is broken down into two sub-calculations with the angle of rotation of the first edge and with the angle of rotation from the first to the second edge, adjustment of the first edge A first partial calculation of the parameters is also used for the second edge, and a second partial calculation of the adjustment parameters is used for a predefined number of coordinate rotations.

In the corn flue-cured tobacco rotation system, the method of returning straw to the field on the spot is suitable for the flue-cured tobacco-corn rotation cropping field that ripens once a year. The corn is cultivated in ridges, and 2 rows of corn are planted in each ridge, and the height of each ridge is 30±2cm. The corn between the two ridges The wide row spacing is 70±5cm, the narrow row spacing between the two rows of corn on each ridge is 50±5cm, and the plant spacing is 25‑30cm; after the corn is harvested, the original ridge and furrow are used without plowing, and the cut straw is directly spread in the furrow Shi returned to the field. Secondly, the microbial fertilizer is spread on the straw, and the soil of the ridge body is poured into the furrow and covered with soil to bury the straw. In the second year, 10-15 days before the flue-cured tobacco is transplanted, spread the flue-cured tobacco base fertilizer in the furrow where the corn stalks are buried. Plowing and gathering ridges, sorting them into ridges to cultivate flue-cured tobacco. The corn stalks and the flue-cured tobacco stalks of the invention are directly applied to the tobacco fields on site, effectively realizing the sustainable development of the tobacco fields.

The invention discloses a composite vortex recognition model construction method based on Helmholtz decomposition and deep learning, and the method comprises the following steps: obtaining data of a flow velocity U in the east-west direction and a flow velocity V in the south-north direction of seawater, and constructing a velocity vector field image; performing Helmholtz decomposition on the velocity vector field image to obtain an image with a potential field Fd and an image with a rotation field Fc; according to a potential function and UV data in the rotation field Fc, labeling a single-vortex air vortex, a single-vortex anti-cyclone vortex, a compound-vortex air vortex and a compound-vortex anti-cyclone vortex, and taking rotation field images before and after labeling as a deep learning data set; and training the deep learning data set by using a neural network to obtain a composite vortex recognition model. The Helmholtz decomposition method is used for processing derivative data of the satellite altimeter, the recognition accuracy of the compound vortex is improved, the deep learning method is adopted, the recognition efficiency of the compound vortex is improved, and finally application of the model to the whole sea area is achieved.