50 results about "Magnetic chain" patented technology

The invention relates to the technical field of servo control, in particular to a high-precision current closed-loop control system and method for a servo driver, and the method comprises the steps: collecting three-phase current, rotor position, winding temperature and bus voltage, and constructing a state data set; constructing a parameter identification model fusing physical prior and an attention mechanism, deducing inductance and flux linkage parameters influenced by temperature, saturation and cross coupling, and correcting a motor model in real time; the correction parameters are injected into an FOC decoupling and feedforward link, and a self-adaptive PI regulator is linked to set the gain of a current loop on line; calculating a d-q axis voltage command according to the update model to respectively control excitation and torque components; an extended state observer is introduced to estimate load abrupt change and parameter disturbance, feed-forward compensation is carried out, and three-phase PWM is generated through anti-Parker and SVPWM; and an inverter nonlinear compensation model of a dead zone and switch delay is constructed, PWM is pre-distorted and output to a power device, and robust and low-ripple current closed-loop control of the servo motor is realized.

The present invention belongs to the technical field of parameter identification for permanent-magnet synchronous motors. Disclosed are a parameter identification method and apparatus for a permanent-magnet synchronous motor, and a storage medium and a device. The method comprises: using a variable step-size feedback neural network algorithm to solve a voltage equation and a d-q axis current discrete state equation, which take cross-coupled inductance into consideration, of a permanent-magnet synchronous motor in a dq coordinate system, so as to obtain intermediate parameters generated in the process of constructing the d-q axis current discrete state equation; and performing calculation on the basis of the intermediate parameters, so as to obtain the stator resistance, the d-axis inductance, the q-axis inductance, the cross-coupled inductance and the permanent-magnet flux linkage of the permanent-magnet synchronous motor, and thereby completing parameter identification. The present invention takes cross-coupled inductance into consideration and uses the variable step-size feedback neural network algorithm, such that the computational load is extremely small, the degree of complexity is reduced, rapid and effective identification can be realized, and errors can be reduced; in different convergence time periods, the algorithm adjusts the step size on the basis of the magnitude of steady-state errors, such that identification results approach stable values more quickly, thereby improving the speed and stability of convergence.

The invention provides an oblique coil electromagnetic classificator for separating weak magnetic impurities from strong magnetic concentrate, which comprises a separation cylinder, an ore feeding device and a flushing device, an ore feeding pipe of the ore feeding device extends into the separation cylinder from the top end of the separation cylinder, the flushing device is arranged below the ore feeding pipe, and an oblique coil is arranged on the outer side of the separation cylinder, so that the weak magnetic impurities can be separated from the strong magnetic concentrate. Magnetic lines of force are obliquely distributed, magnetic linkages formed by magnetic particles are oblique, the whole magnetic linkages can be efficiently impacted in cooperation with vertical component force Fz of water flow of the flushing device, and scattering of magnetic aggregates is facilitated; the tail control flat coil and the concentrate gathering flat coil at the upper end and the lower end effectively control tailings and concentrates respectively, so that the separation efficiency of strong magnetic concentrates and weak magnetic impurities is improved, for example, in the iron-titanium separation operation of vanadium titano-magnetite ore dressing, ilmenite mixed into iron ore concentrates can be reduced, the grade of the iron ore concentrates can be improved, and titanium metal resources can be fully recycled.

The invention discloses a flux linkage interpolation model adaptive gradient scheme-based switched reluctance motor sensorless control method, which comprises the following steps of S1, designing a flux linkage interpolation model FLIM by representing flux linkage characteristics of rotor misalignment and alignment positions of a switched reluctance motor SRM; s2, designing an adaptive gradient optimization algorithm, and estimating the optimal position of the rotor by updating an interpolation function in real time; and S3, aiming at the phase fault problem, providing a fault-tolerant strategy, namely fault phase flux linkage reconstruction FPFR, and reconstructing the flux linkage at the fault phase. According to the method, FLIM magnetic flux link modeling, adaptive gradient optimization and FPFR fault-tolerant control are combined, and the FLIM model not only significantly reduces the modeling complexity, but also lays a foundation for high-precision observation. According to the adaptive gradient method, real-time dynamic optimization is realized through a magnetic flux link error, and the inherent problems of calculation complexity and response lag of a traditional observer are effectively solved. The FPFR strategy reconstructs the fault phase magnetic flux characteristics, and a feasible solution is provided for high-reliability application.

The invention discloses a permanent magnet synchronous motor inductance matrix automatic calibration method and system, and the method comprises the steps: carrying out the system initialization, permanent magnet flux linkage reference calibration, weak magnetic region progressive current scanning, inductance parameter differential calculation and parameter integration, employing a positive and negative q-axis current symmetric excitation and differential operation mechanism as the core, and automatically counteracting the influence of a resistance item. Meanwhile, the weak magnetic working range of the d-axis current from-100A to-1000A is completely covered, and a full-working-condition inductance parameter two-dimensional mapping table is generated. The system does not need extra precision equipment, is small in algorithm calculation amount, is high in calibration efficiency, can adapt to batch application of a production line, can directly integrate a mapping table into a motor controller, achieves the real-time high-precision parameter calling through an interface function and two-dimensional linear interpolation, remarkably improves the torque precision and operation stability of field-weakening control of the permanent magnet synchronous motor, and is suitable for popularization and application. The method is suitable for motor parameter calibration in the fields of electric automobiles, industrial servo and the like.

The invention relates to the technical field of converters, in particular to a power dispatching system based on a multi-level direct current chopping technology, which comprises a flux linkage trend analysis module, a duty ratio constraint module, a standby unit evaluation module and a path synchronization coordination module. According to the method, the power integral curve is constructed in real time, the flux linkage increment trend is analyzed, the relevance between the flux linkage direction and the current change is dynamically judged, the duty ratio amplitude limiting range is adjusted in combination with the exponential smoothing prediction model, and phase compensation correction is executed, so that the dynamic response capability of the system is remarkably improved; a sliding standard deviation algorithm is adopted to screen a standby unit group and analyze a current fluctuation coefficient, linear regression is combined to process a temperature change trend, the anti-interference capability of the system is enhanced, a dynamic time warping algorithm is adopted to calculate a phase offset and construct a voltage difference vector, accurate synchronous control of a multi-level architecture is realized, and the stability of the system is improved. Harmonic content and energy loss are effectively reduced, electric energy conversion efficiency and equipment operation stability are improved, and the service life of a power device is prolonged.

The application discloses a kind of magnetic seed induced mineral separation methods of iron ore, comprising the following steps: (1) processing mixed iron ore obtains dry magnetic separation concentrate and dry magnetic separation tailings;(2) dry magnetic separation tailings magnetization roasting obtains artificial magnetite;(3) dry magnetic separation concentrate is mixed with artificial magnetite;(4) the raw ore into mill is sent into one-stage closed-circuit grinding classification system, then enters one-stage low-intensity magnetic separation operation;(5) one-stage low-intensity magnetic rough concentrate is sent into two-stage closed-circuit grinding classification system, then enters two-stage low-intensity magnetic roughing operation;(6) two-stage low-intensity magnetic roughing concentrate is demagnetized after entering two-stage low-intensity magnetic cleaning operation by demagnetizer;(7) two-stage low-intensity magnetic cleaning concentrate is concentrated after demagnetization by demagnetizer, and iron concentrate product is obtained by flotation.The application adds natural magnetite contained in ore into artificial magnetite, which is easy to form magnetic chain with natural magnetite as core to strengthen the magnetic separation recovery of artificial magnetite, and the separation process has high iron recovery rate and high concentrate grade.

This application discloses a magnetorheological extrusion mode suspension and its control method, an on-board terminal, and a vehicle. The magnetorheological extrusion mode suspension includes: a sleeve; a bracket located inside the sleeve; a hollow support member located between the sleeve and the bracket; a magnetorheological fluid located within the cavity of the hollow support member; and a coil disposed on the bracket at a position corresponding to the cavity. The normal direction of the coil extends radially along the sleeve and passes through the magnetorheological fluid. Different current intensities result in different magnetic field intensities and different yield strengths of the magnetorheological fluid; different current directions result in different magnetic field directions, different magnetic flux directions, and different damping forces of the magnetorheological fluid. Therefore, the intensity and direction of the current can be adjusted according to the excitation conditions to form magnetorheological fluids with different yield strengths and different damping forces to adapt to vibrations in a wide frequency range and achieve better vibration isolation effects across the entire frequency range.

The invention provides a motor angle and rotating speed determination method and system, electronic equipment and a storage medium. The method for determining the angle and the rotating speed of the motor comprises the following steps: detecting first voltage and first current of the motor; obtaining a first flux linkage according to the first voltage, the first current and a voltage model in a flux linkage observer; obtaining a second flux linkage according to the first current and a current model in the flux linkage observer; determining a third flux linkage according to the first flux linkage, the second flux linkage and a switching function in the flux linkage observer; and inputting the third flux linkage into a phase-locked loop module to determine the angle and the rotating speed of the motor. According to the method, the first flux linkage is determined by inputting the voltage and the current of the motor into the voltage model, the second flux linkage is determined by inputting the current into the current model, and then the final third flux linkage is obtained according to the first flux linkage, the second flux linkage and the switching function, so that the anti-interference capability of estimating the flux linkage position is improved; and the problems of direct current bias and integral saturation are avoided.

The invention discloses a surface-mounted permanent magnet synchronous motor all-parameter online identification and efficiency optimization control method considering iron loss influence, and relates to the technical field of motor control, the method comprises the following steps: based on a mathematical model of an SPMSM considering motor iron loss, obtaining an expression of a d-axis current reference value of loss minimum control; an SPMSM parameter identification model of the lumped parameters is established, and on-line identification of stator resistance, inductance, permanent magnet flux linkage and iron consumption resistance is achieved based on identification of the lumped parameters; based on online identification of stator resistance, inductance, permanent magnet flux linkage and iron consumption resistance, through an expression of a d-axis current reference value of loss minimum control, setting of a current reference value under SPMSM loss minimum control is realized. The invention provides an effective method for all-parameter online identification and efficiency optimization control of the surface-mounted permanent magnet synchronous motor considering the iron loss influence, and the motor efficiency and robustness of the SPMSM are effectively improved.

The utility model relates to the technical field of magnetic powder clutches, and discloses a low-noise magnetic powder clutch which comprises a machine shell, and a first driving shaft is arranged on the right side of the machine shell. According to the low-noise magnetic powder clutch, after the magnet exciting coil is powered on, the magnetic powder braking unit starts to distribute magnetic powder through the first magnetic powder distributing pipeline and the second magnetic powder distributing pipeline, a dotted line closed loop is formed, a magnetic medium in a flowing state starts to be solidified in a magnetic field, and when the magnetic field intensity is large, the magnetic powder almost becomes a solid; meanwhile, magnetic powder particles between the electromagnet and the second driven disc form magnetic linkages, the first driving disc and the electromagnet are connected together, if the current passing through an electromagnet coil is larger, the number of the magnetic linkages is larger, the magnetic linkages are stronger, and when the magnetic linkages are larger and stronger, the torque transmission capacity of the magnetic powder clutch is larger; the vibration absorber can counteract vibration generated in the flux linkage forming process, and the first throttling valve and the second throttling valve control the laying speed of the magnetic powder so as to control noise.

The invention belongs to the technical field of rare earth permanent magnet material preparation, and provides a neodymium-iron-boron magnet and a preparation method for improving the orientation degree of the sintered neodymium-iron-boron magnet, and the preparation method comprises the step of sintering a neodymium-iron-boron green body in a magnetic field. Preferably, the magnetic field is a direct-current magnetic field, and the magnetic induction intensity of the direct-current magnetic field is 10-13T. The high-intensity magnetic field can magnetize magnet powder particles in the sintering process, so that a magnetic chain is formed among the powder particles, the binding force among the particles is improved, and the powder particles cannot rotate due to the generation of a liquid phase. The neodymium-iron-boron powder particles are arranged according to the magnetic field direction in the sintering process, so that the high orientation degree of the magnet is ensured, and the high-performance neodymium-iron-boron magnet is obtained.

The present invention belongs to the field of river interception technology, and discloses a composite fluid interception and purification device for river ecological restoration, including a mounting frame arranged on both sides of the river, and also including: a collection component, the collection component is arranged on the mounting frame, and is used to collect river garbage and aquatic plants. The present invention is installed in the river through a support component and a connecting component, and the two connecting components form an angle for guiding the river garbage. A second transmission gear and a third transmission rod are driven to rotate by a driving motor, and the magnetic chain, the first screen and the paddle are driven to rotate by the first transmission gear. The garbage is intercepted by the first screen under the action of the water flow, and is transported to the collection component for storage through the rotation of the first screen and the paddle. At the same time, due to the mutual meshing of the two second transmission gears, the garbage in the river is transported to the collection components on both sides of the river through the reverse rotation of the two connecting components, thereby ensuring the scope of river cleaning and effectively improving the river garbage cleaning effect.

The present invention comprises an ellipsoid (100) having an elliptical orbit (110), a central rotating body (200) supported in the ellipsoid internal space (121), which is the internal space of the ellipsoid (121), so as to be able to rotate concentrically with the center of the elliptical orbit (110), and a rotating blade (300) that rotates and reciprocates, with the rear end supported in the elliptical orbit (110) and the front end supported in the central rotating body (200), and the magnetic body (400) composed of a permanent magnet or an electromagnet; wherein the magnetic body (400) composed of a permanent magnet or an electromagnet is arranged, and an electric supply means (501), an electric storage means (520), and an electric control means (530) are provided to supply, convert, and store alternating current or direct current power to the magnetic body (400), thereby selectively performing a motor mode and a generation (braking) mode. Rotational power is generated by the attractive and repulsive forces between magnetic bodies (400), or regenerative power is generated when necessary, and rotational power conversion is utilized by the attractive and repulsive forces between magnetic bodies (400), and fluid is circulated through the fluid flow path (230) formed between the internal space (121) of the ellipsoid (100) and the central rotating body (200), and through the impeller (280), piston (340), or body guide (350). The above-mentioned ellipsoidal magnetic body (410) is a multilayered ellipsoidal magnetic body (411) composed of a plurality of magnetic bodies (400) arranged in a tangential direction of the elliptical orbit (110) or the inner surface of the ellipsoid, and the above-mentioned ellipsoidal body (100) is formed as a composite ellipsoidal body (105) divided into a plurality of internal spaces (121) by a dividing wall (180), and is configured to simultaneously perform a plurality of pump and compression functions by operating different fluids or forming different pressure and flow rate conditions depending on the space, thereby forming a composite ellipsoidal driving device by a magnetic body chain structure, characterized by According to the present invention, by applying a magnetic body (300), which is a permanent magnet or an electromagnet magnetized by the supply of electricity or magnetism, to an ellipsoid (100) utilizing an elliptical orbit, a central rotating body (200), and a rotating wing (300), mechanical, electromagnetic, and fluid mechanical elements are combined simply and complexly to simplify the structure, reduce the number of parts, operate stably to increase power transmission efficiency, and reduce the required space. Furthermore, by actively controlling the magnetic body (400) (electric supply means (510) → electric control means (530) → magnetic body (400)), the present invention enables easy starting of rotation even without a starter motor, and allows the device to switch to a power generation mode when necessary during rotation to accumulate regenerative energy in an electric storage means (520). Additionally, it realizes a high-efficiency drive device that performs multi-functional functions such as pumping, compression, and propulsion within a composite ellipsoid while integrating thermal management (lubrication and cooling). In particular, the electric control means (530) combines a switch, inverter, converter, gate driver, and sensor control logic to automatically perform real-time mode switching (motor↔generation↔pump↔propulsion), and by precisely controlling the current, voltage, and phase in each mode, it has the effect of securing high energy efficiency and stability.

The invention relates to the field of medical equipment, and discloses a magnetic ring array treatment device, which comprises at least two closed magnetic rings or magnetic linkages, the magnetic rings or magnetic linkages are arranged in a fan shape, a circle shape or a spherical arc shape and then are fixed on a fixed support to form a magnetic ring array, and at least one metal coil is wound on each magnetic ring or magnetic linkage. A closed loop is formed between each of the two ends of each metal coil and one alternating signal generating circuit; in the magnetic ring array, preset alternating electric fields generated in the magnetic rings or the magnetic linkages are superposed and converged at a focal point. When in use, a carrier of tumor cells which are rapidly split is directly placed on a convergent focus of a preset alternating electric field generated in each magnetic ring or magnetic chain in the magnetic ring array, so that a superposed alternating electric field can be generated in the tumor cells which are rapidly split, similar to energy concentration, and a disease part can be treated more effectively; alternating electric fields in different directions can be generated, disease parts can be treated from different angles, and the device does not need to be tightly attached to the skin.

The invention relates to the field of motor control methods, in particular to a motor torque precision control method and device, a medium and equipment, and the method comprises the steps: obtaining a first stator flux linkage estimation value of a d axis and a second stator flux linkage estimation value of a q axis of a stator when a motor operates at a low speed, the first stator flux linkage estimated value is the sum of the flux linkage of the permanent magnet and the flux linkage generated by the d-axis current through the inductor, and the second stator flux linkage estimated value is the flux linkage generated by the q-axis current of the stator through the inductor; when the motor runs at a high speed, acquiring third stator flux linkage estimated values of the d axis and the q axis of the stator, calculating a difference value between the voltage signal and the current signal of the d axis and the q axis of the stator, and performing integration to obtain the third stator flux linkage estimated value and an actual flux linkage estimated value of the motor; and calculating the ratio of the actual flux linkage estimated value to the initial permanent magnet flux linkage to obtain a torque error compensation coefficient of the permanent magnet flux linkage influenced by the temperature, and correcting a q-axis current instruction output by the MTPA lookup table based on the torque error compensation coefficient to correct a torque error. According to the invention, temperature compensation is carried out on motor torque control, so that the motor can accurately and stably output at different temperatures, and the torque output precision of the motor is improved.

The application relates to the technical field of robot control, and discloses a control method and system for a robot finger joint, which comprises the following steps: performing multi-physical field signal acquisition, injecting a high-frequency excitation into a driving voltage, and extracting a current response; using a high-frequency response to analyze a resistance value, combining a heat conduction model to calculate a real-time temperature of a coil, and reconstructing an effective magnetic chain of a permanent magnet according to a temperature coefficient; according to the temperature, lubricating viscous characteristics are mapped, and an adaptive chatter signal with the amplitude and frequency dynamically mapped to a thermal state is generated in combination with a real-time rotating speed; based on the effective magnetic chain, a torque conversion coefficient is corrected, and the chatter signal is superimposed to a current loop to generate a target current instruction to drive a motor. Through the construction of a sensorless thermal magnetic observation mechanism and a thermal viscous coupling compensation strategy, the application effectively solves the problems of thermal parameter drift and friction nonlinearity of a miniature joint caused by space limitation, and guarantees high-precision torque output and low-noise smooth operation in a full-temperature-range working condition.

The invention discloses a control method and a control device for realizing a virtual permanent magnet synchronous generator, and relates to the technical field of power supplies. The power level topology of the virtual permanent magnet synchronous generator is a three-phase inverter, the d-axis component of a reference resultant vector of a grid-side three-phase bridge arm is zero, the q-axis component is npXdc psi f, np is the number of virtual pole pairs, Xdc is the physical quantity of a direct current side, and psi f is a virtual flux linkage. And the output quantity is adjusted by controlling the number np of the virtual pole pairs and the virtual flux linkage psi f. According to the method, the control strategy of the network-forming inverter is simplified, a phase-locked loop is not needed, control resources are saved, the application range is wide, and implementation is easy.

The present application belongs to the field of wireless power transmission, and particularly relates to a multi-rectangular transmitting coil of a wireless power transmission system and an assembling method thereof, aiming to solve the problem that the magnetic field of the existing multiple rectangular coils will cause the magnetic chain and the induced voltage of the receiving coil to fluctuate greatly when the receiving coil moves to the vicinity of the handover area of the adjacent transmitting coil. The present application comprises: in the N rectangular transmitting coils, the first rectangular transmitting coil comprises a left plane bending area, a straight area and a right plane bending area, and the i-th rectangular transmitting coil comprises a left upper and lower plane bending area, a straight area and a right plane bending area; the left upper and lower plane bending area of the i-th rectangular transmitting coil is arranged below the right side of the straight area of the (i-1)-th rectangular transmitting coil as an overlapping area; a magnetic core plate is arranged above the overlapping area, and i is an element of [2, N]. The magnetic field of the present application is relatively uniform in the entire transmitting coil coverage length range, without the need for additional hardware circuits or software algorithms, and the present application has the advantages of less material laying, simple installation and the like.

The utility model relates to electronic equipment and accessory equipment, and the electronic equipment comprises a shell which is provided with a containing groove, the containing groove is used for containing the accessory equipment, and the accessory equipment is matched with the electronic equipment for use; the first wireless charging assembly is arranged in the shell and is close to the containing groove, the accessory equipment is charged through a first magnetic core, the arrangement mode of the first magnetic core meets the requirement that the first magnetic core is matched with the accessory equipment in a charging mode to form a closed magnetic linkage, and at least part of the first magnetic core is arranged in the containing groove. According to the wireless charging device, the accommodating groove is formed in the shell, and the setting mode of the first magnetic core meets the requirement that the first magnetic core is matched with the accessory equipment for charging to form the closed magnetic chain, so that the charging efficiency of wireless charging is enhanced, and heat generated in the charging process is reduced.

The invention relates to a ship PMSM control method and system based on an adaptive overcompensation multi-vector cascade sliding window integral model, and the method comprises the steps: S1, building a PMSM mathematical model considering parameter mismatch and model uncertainty, and calculating a k + 1 moment axis current, PMSM torque and d-axis flux linkage equation without disturbance compensation; s2, the torque of the PMSM at the k + 1 moment without disturbance compensation and the d-axis flux linkage error are converted into a shaft current compensation signal to be fed back to the shaft current, and a k + 1 moment shaft current, PMSM torque and d-axis flux linkage equation with disturbance compensation is constructed; s3, predicting a k + 2 moment axis current, a PMSM torque and a d-axis flux linkage equation based on the k + 1 moment axis current with disturbance compensation, applying a sliding integral window and designing an adaptive integral weight, and designing and evaluating a cost function in a novel proportion-integral form so as to select an optimal inverter switching vector; and S4, flux-weakening control is designed on an outer ring, a d-axis current reference value is provided, and flux-weakening operation optimization is realized.

The application provides a motor rotor position determination method and device. The motor rotor position determination method provided by the application comprises the following steps: acquiring electromagnetic parameters of a motor, determining a magnetic chain of the motor according to the electromagnetic parameters, wherein the electromagnetic parameters comprise current, voltage, inductance and resistance; performing negative feedback correction on the magnetic chain to obtain a magnetic chain after correction of drift; and determining the position of the motor rotor according to the magnetic chain after correction of drift. The motor rotor position determination method provided by the application can accurately obtain the position of the motor rotor.

The application relates to a contactor contact wear online observation method, which adopts a BP neural network model to design a moving iron core displacement observer and an electromagnetic suction force observer according to the binary one-to-one mapping relationship of electromagnetic mechanism coil current i , magnetic circuit magnetic chain Ψ , moving iron core displacement x , electromagnetic suction force F x ; the electromagnetic suction force and the moving iron core displacement are directly observed according to the coil current and the coil voltage in the contactor closing process; the counterforce integral waveform is obtained after the electromagnetic suction force F x , moving iron core displacement x is calculated v f ; the counterforce step is indirectly identified by observing the counterforce integral waveform, the integral operation converts the step signal into a turning point signal, so that the contact wear is indirectly identified. The technical scheme directly observes the current contact wear condition through the designed contact wear observer in the contactor closing process, is used for guiding contact replacement and predictive maintenance of the contactor, and ensures reliable operation of the contactor during the working period.

The application discloses a sensorless model predictive speed control method of an induction motor, and first, a mathematical model of the induction motor is modeled based on a two-phase static coordinate system to obtain an induction motor mathematical model; a full-order observer is constructed to obtain an estimated value of a rotor speed and an estimated value of a magnetic chain of the induction motor through the full-order observer; parameter identification of a stator resistance is introduced into a motor speed estimation and a model prediction module; then, a prediction model is established to predict the stator magnetic chain and the rotor speed at k+1 time to obtain a stator magnetic chain prediction value and a rotor speed prediction value; finally, a reduced-order load torque observer is constructed to perform feedforward compensation on a speed outer ring of a control system to improve the dynamic response of the system. The application solves the problem that sensor faults in the prior art may cause system performance to decrease or even cause system collapse.

The invention discloses a flux linkage nonlinear modeling-based sensorless control method for a switched reluctance motor, and belongs to the technical field of motor control, and the method comprises the following steps: applying an ICOA to nonlinear sensorless modeling, i.e., combining a radial basis function neural network RBFNN with an improved subwolf optimization algorithm ICOA, so as to obtain a simple and compact RBFNN model. The ICOA is applied to non-linear sensorless modeling to obtain a simple and compact RBFNN model, the relationship among magnetic flux, current and rotor position is more accurate through online training, accurate commutation is realized by adopting a rotor position estimation strategy, and no matter which control mode is in, the control mode is more accurate. The current speed waveform obtained by the ICOA-RBFNN is not greatly different from the waveform obtained by the traditional FEA, the sensorless control using the ICOA-RBFNN is suitable for accurately estimating the rotating speed and the rotor position under various working conditions, the tracking error meets the requirement within a certain range, the adaptability is good, and the dynamic response capability is improved.

The invention relates to the technical field of electromagnetic control, and discloses a degaussing method, device, equipment and medium for a magnetic shielding device, the magnetic shielding device comprises a magnetic core and a degaussing coil wound on the magnetic core, the method comprises the following steps: firstly, applying voltage to the degaussing coil to drive the magnetic core to a magnetic saturation state; the saturation state is judged when the current flowing through the coil reaches a preset saturation current threshold value, and a saturation flux linkage value is determined on the basis. Then, based on the saturation flux linkage value and a preset flux linkage offset, a flux linkage threshold sequence is determined; and finally, by alternately reversing the polarity of the voltage applied to the degaussing coil, the peak value of the instantaneous flux linkage in the coil is guided to sequentially reach each flux linkage threshold value in the sequence. According to the method, firstly, the saturation flux linkage value of the device is determined, then the peak value of the instantaneous flux linkage is controlled on the basis, and accurate adjustment of the demagnetization process is achieved.

According to the electromagnetic composite tool, the electromagnetic composite magnetic field cluster magneto-rheological polishing device comprising the electromagnetic composite tool and the polishing method, a strong coupling magnetic field generated by the electromagnetic composite tool changes the clamping capacity of a magnetic chain string to a machining abrasive, the mechanical property of a magneto-rheological polishing pad is improved, the shear yield stress of the magneto-rheological polishing pad is enhanced, and the polishing effect is improved. And the magnetorheological polishing pad is in the dynamic change process, the machined abrasive can be clamped again along with rotation of the polishing disc, the self-sharpening updating capacity of the abrasive is enhanced, machining nonuniformity is reduced, and machining efficiency is improved. Different processing environments are adapted by increasing or reducing the types of the magnetic field generating devices and changing the intensity of the generated magnetic field, and compared with a frame for processing a plurality of magnetic field generating devices, the magnetic field generating devices are variable and share one outer frame structure, so that the manufacturing cost of the device is reduced, and the processing flow is simplified.

The invention relates to a control method and system of a bearingless permanent magnet synchronous motor suspension system. Firstly, three-phase voltage and current values of a suspension winding at the current moment are sampled, current prediction is carried out, and a high-frequency part of suspension prediction current at the k + 1 moment is extracted; sampling a current three-phase current value of the torque winding, and calculating an air gap flux linkage; predicting a displacement value at the k + 1 moment based on an actual displacement signal at the current moment and the like; and finally, taking the displacement predicted value and the high-frequency part of the suspension predicted current as a value function constraint variable to adjust a switch state, and outputting an optimal state to an inverter to realize direct control of the displacement of the suspension system. Compared with the prior art, the method has the advantages of simple parameter setting, fast dynamic response and the like.

This invention relates to the field of stress detection technology, specifically to a tension, compression, and torsion loading measurement device and operating method suitable for irregularly shaped components. The tension, compression, and torsion loading measurement device for irregularly shaped components includes a tension / compression eccentric loading assembly, a torsion assembly, and a reaction force assembly. The tension / compression eccentric loading assembly includes a jack, with the jack and reaction force assembly located at opposite ends of the irregularly shaped component. The torsion assembly has two components, located at opposite ends of the irregularly shaped component, each including a torsion toothed disc, a magnetic chain, and two telescopic toothed plates. The inner ring of the torsion toothed disc has a polygonal hole, and multiple electromagnetic blocks repelling the magnetic chain are arranged circumferentially on the inner ring of the torsion toothed disc. The magnetic chain is wound around the loading positions at both ends of the irregularly shaped component, and the electromagnetic blocks are used to make the magnetic chain adhere to the irregularly shaped component. This effectively prevents the irregularly shaped component from failing at the loading position before the unloading position during the loading process. Furthermore, the length of the magnetic chain can be adjusted according to the cross-sectional outer contour length of different irregularly shaped components, making it highly adaptable.