19 results about "Electromagnetic load" patented technology

The application discloses a claw pole stepping motor with an integrated stator core, and belongs to the field of permanent magnet stepping motor design. The application is used for solving the problem that the equivalent air gap of the main magnetic circuit is increased and the torque density is decreased due to the split stator structure of the micro claw pole stepping motor. The application comprises a stator and a rotor. The stator adopts an integrated stator core which is integrally bent and formed from a single plate material, and sequentially forms an inner claw pole, a stator tooth bottom, a stator wall, a stator tooth top and an outer claw pole from inside to outside along the radial direction. The stator tooth bottom is provided with a positioning hole for inserting and fixing a coil framework. The coil framework is provided with a wire outlet structure, so that the coil can be led out from the gap of the core. The rotor comprises a rotating shaft and a permanent magnet. The integrated stator core design eliminates the assembly joint of the split structure, effectively reduces the equivalent air gap, reduces the magnetic flux leakage, and thus significantly improves the torque density and electromagnetic load of the motor.

This invention relates to the field of permanent magnet synchronous motor (PMSM) design technology, and discloses a method and device for integrated collaborative optimization design of the rotor magnetic circuit of a PMSM. The method includes: collecting time-series data of multi-source vibration and electromagnetic load under heavy-load conditions of forklift operation, and constructing a dynamic excitation phase space mesh for the rotor interface; performing multi-field coupled response simulation based on the mesh to drive a parameterized rotor model, generating a structural eddy current coupled simplex complex; constructing a combined constraint and sub-mode gain model for robust magnetic circuit optimization based on the complex, generating a geometrically reinforced candidate solution set; performing multi-objective collaborative convergence and three-dimensional model generation under the constraints of the candidate solution set, and outputting an anti-disturbance optimized rotor structure. This invention solves the problem that existing technologies cannot cope with dynamic multi-field positive feedback under complex forklift operating conditions, leading to decreased efficiency and low reliability of the motor during continuous operation, thus enabling the motor to adapt to forklift operation requirements.

This invention discloses a soil-rock drying-wet cycle test system and method under continuous loading. The soil-rock drying-wet cycle test system under continuous loading includes a rock sample test chamber, in which rock samples are placed; a simulated precipitation system is located on the inner top of the rock sample test chamber; an electromagnetic load loading system is located inside the rock sample test chamber and on top of the rock sample to apply a moving load to the rock sample; and a ventilation and drying system is located on the side of the rock sample test chamber to ventilate and dry the rock sample. The electromagnetic load loading system includes a motion track located on top of the rock sample test chamber; an electromagnetic loading cylinder located on top of the rock sample; a lower pressure pad laid on the bottom of the rock sample; and an electromagnet located above the electromagnetic loading cylinder and within the motion track, which can reciprocate along the motion track under the drive of a magnet driving device; the end of the electromagnet near the electromagnetic loading cylinder has the same polarity as the electromagnetic loading cylinder. The system can automatically realize the drying-wet cycle, crushing, and screening of the rock sample.

The utility model discloses a lightweight permanent magnet synchronous motor for an electric aircraft. An electromagnetic structure in the motor comprises a stator iron core, an armature winding, a permanent magnet, a rotor magnet yoke and a rotor bracket, the stator iron core is of an annular columnar structure, stator grooves penetrating through the axial direction are evenly formed in the end face of the stator iron core in the circumferential direction, and armature windings are arranged in the stator grooves. A rotor magnet yoke is arranged to be of an annular thin-wall structure, a plurality of pole permanent magnets which are sequentially connected are evenly pasted to the outer ring wall face of the rotor magnet yoke in the circumferential direction, and an excitation assembly of an annular columnar structure is formed by the pole permanent magnets. The rotor magnet yoke and the permanent magnets of each pole adhered to the outer side wall of the rotor magnet yoke are mounted on the inner side of the stator iron core through the rotor bracket, and the permanent magnets of each pole and the inner side wall of the stator iron core form an annular thin-wall gap, so that the rotor magnet yoke, the permanent magnets of each pole and the rotor bracket rotate relative to the stator iron core; the permanent magnet of each pole is of a segmented structure and is divided into four segments which are arranged in a central symmetry mode, and the four segments comprise the two samarium cobalt permanent magnets located in the middle and the two neodymium iron boron permanent magnets located on the two sides. According to the technical scheme of the utility model, the problem that as most of the existing aviation permanent magnet synchronous motors adopt high-speed and high-electromagnetic-load design, the temperature rise of the motors is too high, and the stable operation of the motors is greatly threatened is solved.

The invention discloses an electromagnetic heating equipment control method based on load sensing, and particularly relates to the technical field of electromagnetic heating equipment control, which comprises the following steps: acquiring current and voltage when a special deck thick coating reaches a preset stripping temperature, and dividing point by point in a sliding time window to obtain an impedance sequence; identifying abnormal energy fluctuation of frequency points in the impedance sequence based on a fast Fourier transform tool to form a frequency fluctuation curve; by fusing coating thickness change, electromagnetic load response characteristics and temperature rise rate indexes, a dynamic regulation and control and multi-parameter analysis mechanism is constructed, continuous tracking of the degeneration process of the interface layer and judgment of the stripping completion state are achieved, and therefore it is ensured that the stripping conclusion is consistent with the real state of the interface; the problem that an existing judgment link depends on a macroscopic form and lacks an interface verification mechanism is solved.

This invention belongs to the technical field of high-field magnet structure design, specifically involving an adaptive selection method for simulation type in pulse magnet structure design. The method includes: establishing a model of the pulse magnet; using a circuit model to calculate the actual current waveform of the magnet at the required power supply voltage; importing this waveform into an electromagnetic finite element model to calculate the peak electromagnetic load of the magnet; applying this load as a single step load to the structural finite element model; extracting the stress-time curve of each target component; and extracting the fundamental component of this curve using Fourier transform to determine the natural vibration frequency of the component. ω m Perform a Fourier transform on the actual current waveform to determine its fundamental component. ω i If all target components ω m All are greater than N × ω i If a steady-state simulation evaluation is selected, then this invention can solve the problem of the lack of a standardized operating system in the existing pulse magnet structure design that can reasonably use static analysis results to approximate transient analysis results.

There is described an electric power generating apparatus having: a free-piston linear expander having a moving shaft creating mechanical power; an electrical generator converting the mechanical power into electrical power; a variable frequency drive configured for applying an electromagnetic load force modifying the shaft's movement; and a controller communicatively coupled to the variable frequency drive, the controller configured to perform the steps of: receiving sensor data including a first shaft position value, a first shaft velocity value, and a first electromagnetic load force value; using a drive control module, determining, based on the sensor, a second electromagnetic load force value which when applied would cause a shaft velocity to gradually change to a second shaft velocity value, the second electromagnetic load force value and the second shaft velocity value causing an output power value to correspond to a desired output power value; and applying the second electromagnetic load force value.

The invention discloses an intelligent bicycle two-way real-time interaction method and system for synchronizing virtuality and reality. The method comprises the steps that S1, a data acquisition module acquires rotation data of a motor in real time; s2, the microcontroller uploads rotation data of the motor to a cloud server in real time; s3, the cloud server calculates the motion data of the bicycle according to the rotation data of the motor, and synchronously renders the motion state of the user or the carrier in the virtual world; step T1, the cloud server generates a resistance control instruction in real time, and issues the resistance control instruction to the microcontroller in real time through the communication module; and T2, the microcontroller switches the motor to a generator mode, adjusts the electromagnetic load of the motor to simulate the environmental resistance in the virtual world, and stores the electric energy generated by the motor in the battery unit. According to the method, data of the real world can be uploaded, roles in the virtual world can be rendered, and environment parameters in the virtual world are fed back to the real world in real time, so that bidirectional real-time interaction between the real world and the virtual world is realized.

The invention discloses a method for evaluating the impedance performance of a three-way electromagnetic load of a vehicle generator assembly, and the method comprises the steps: splitting a vehicle generator assembly housing into a plurality of plates, carrying out the triangular grid discretization of the surface of each plate, and calculating the total area of each discretized plate; establishing a cylindrical coordinate system of the vehicle engine assembly; under the condition that only radial electromagnetic load, only tangential electromagnetic load and only axial electromagnetic load are applied, excitation is applied to the vertexes of the triangular discrete units on the plates, the three-direction vibration acceleration of the vertexes is obtained, the radiation noise value of each plate is calculated, and a sound radiation noise curve of the vehicle engine assembly within a preset frequency range is obtained; aiming at the sound radiation noise curve in each direction, calculating to obtain radial, tangential and axial impedance coefficients under the electromagnetic load in the direction; and performing weighted fusion on the radial, tangential and axial impedance coefficients through a weighted combination strategy to obtain a comprehensive impedance coefficient, and performing evaluation according to a preset rating standard.

The invention relates to the field of relays, in particular to a large-current-impact-resistant relay which comprises a relay body, an electromagnetic assembly arranged in the relay body, a rotary armature driven by the electromagnetic assembly and an elastic piece, the elastic piece is provided with a fixed end and a movable end, and a movable contact is arranged at the movable end or at the position close to the movable end. The movable contact is arranged corresponding to a static contact arranged in the relay body, and the rotatable execution piece is provided with an execution piece main body which is rotatably arranged on the rotary shaft; the rotary armature is provided with a first transmission part, and the first transmission part is in transmission fit with the first acting part of the rotatable execution part. Through the design of the acute angle pressure direction, the closed state can be maintained, and the rotating torque for separating the contacts is greatly reduced, so that the capacity of the relay for resisting the impact of large-current electric repulsive force is remarkably improved on the premise that the electromagnetic load is not increased.

This application discloses an electromagnetic load switch simulation test device, including an electric closing module, a fault current holding module, a mechanical closing module, a switch position acquisition module, and an I / O control module for sending closing position remote signaling to the closing device. The input terminal of the electric closing module is connected to the AC power supply, and the output terminal is connected to the input terminal of the switch position acquisition module. The input terminal of the fault current holding module is connected to the three-phase current, and the output terminal is connected to the input terminal of the switch position acquisition module. The mechanical closing module, the electric closing module, and the fault current holding module enable the switch position acquisition module with an OR logic relationship. The output terminal of the switch position acquisition module is connected to the I / O control module. This application has functions such as "closing upon power restoration and opening upon power failure," "maintaining the closed position during a fault," and "mechanical forced closing," and simulates different closing position remote signaling situations that occur during the operation of an electromagnetic load switch.

The invention discloses a motor design method based on a normalized cross coupling magnetic circuit. The method comprises the following steps: constructing a permanent magnet characteristic position magnetic circuit model containing symmetrical magnetic circuit nodes according to uniform division of a permanent magnet pole space; equivalently mapping the d-axis asymmetrically distributed magnetomotive force into the permanent magnet characteristic position magnetic circuit model to realize normalization processing of the d-axis magnetomotive force and the permanent magnet magnetomotive force; superposing magnetomotive force of each tooth of a d axis to symmetrical magnetic circuit nodes of the permanent magnet characteristic magnetic circuit model based on weight distribution to generate equivalent d-axis magnetomotive force; jointly embedding the equivalent d-axis magnetomotive force and the permanent magnet magnetomotive force into the permanent magnet characteristic magnetic circuit model to form a cross coupling magnetic circuit model; and performing iterative calculation on the cross coupling magnetic circuit model, and solving a magnetic circuit equation until convergence to obtain motor design parameters. The method can adapt to the multi-harmonic and high-electromagnetic load characteristics of a high-capacity low-speed motor, and the magnetic field calculation accuracy is improved.

The invention discloses a claw-pole stepping motor with an integrated stator core, belongs to the field of permanent magnet stepping motor design, and aims to solve the problems that the equivalent air gap of a main magnetic circuit is increased and the torque density is reduced due to the fact that a miniature claw-pole stepping motor adopts a split-type stator structure. The motor comprises a stator and a rotor, the stator adopts an integrated stator iron core formed by integrally bending a single plate, and an inner claw pole, a stator tooth bottom, a stator wall, a stator tooth top and an outer claw pole are sequentially formed in the radial direction from inside to outside. Positioning holes are formed in the bottoms of the stator teeth and are used for inserting and fixing a coil framework; the coil framework is provided with a wire outlet structure, so that the coil can be conveniently led out from the iron core notch. The rotor comprises a rotating shaft and permanent magnets. According to the invention, through the design of the integrated stator core, the assembly seam of a split type structure is eliminated, the equivalent air gap is effectively reduced, and the magnetic leakage is reduced, so that the torque density and the electromagnetic load of the motor are remarkably improved.

The invention discloses a method and circuit structure for reducing electromagnetic emission of a power line of an automobile electric control system, and relates to the technical field of electromagnetic compatibility, and the method comprises the steps: finding out a plurality of actuators causing voltage fluctuation on the power line from the automobile electric control system, and taking the actuators as electromagnetic loads of the system; the selected electromagnetic loads are divided into two groups which are respectively controlled by a high-side driving circuit and a low-side driving circuit; and a power line voltage acquisition and control compensation circuit is designed and is used for acquiring a power line voltage signal in real time and outputting a corresponding driving control signal according to the change condition of the signal so as to control the on-off of the high-side driving circuit and the low-side driving circuit. The circuit can realize closed-loop control of a high-side driving circuit and a low-side driving circuit under the condition that the load function is not influenced, two groups of electromagnetic loads are switched to work, the influence of the two groups of electromagnetic loads on the voltage of a power line is neutralized, the voltage fluctuation of the power line can be reduced, and the electromagnetic emission interference of the power line is reduced by maintaining the stable voltage.

The application discloses a motor design method based on normalized cross-coupling magnetic circuit, comprising: constructing a permanent magnet characteristic position magnetic circuit model containing symmetric magnetic circuit nodes according to the uniform division of permanent magnet magnetic pole space; equivalent mapping of magnetic motive force asymmetrically distributed on the d-axis to the permanent magnet characteristic position magnetic circuit model to realize the normalization processing of the magnetic motive force on the d-axis and the permanent magnet magnetic motive force; based on weight distribution, superimposing the magnetic motive force of each tooth on the d-axis to the symmetric magnetic circuit nodes of the permanent magnet characteristic magnetic circuit model to generate equivalent d-axis magnetic motive force; embedding the equivalent d-axis magnetic motive force and the permanent magnet magnetic motive force into the permanent magnet characteristic magnetic circuit model to form a cross-coupling magnetic circuit model; iteratively calculating the cross-coupling magnetic circuit model to solve the magnetic circuit equation until convergence is obtained to obtain motor design parameters. It can adapt to the multi-harmonic and high electromagnetic load characteristics of large-capacity low-speed motors and improve the accuracy of magnetic field calculation.

A kind of simulation retaining wall active soil pressure test device, including main frame structure, loading device and precipitation device, main frame structure includes upper side main beam, lower base, immovable partition plate-and movable partition plate, water sprinkling device is arranged in upper side main beam, water sprinkling device is connected water sprinkling nozzle, drainage passage is arranged in immovable partition plate-and movable partition plate from top to bottom, for simulating soil extrusion drainage process, the upper side of drainage passage is provided with filter core, to prevent soil loss, the lower side is connected lower base drainage, resin glass is installed on lower base, loading device uses electromagnetic load, several loading device is evenly arranged on fixed partition plate and movable partition plate face to face, threaded steel pipe is arranged below movable partition plate, for restoring position after experiment, displacement measuring device is arranged below threaded steel pipe, the advancing distance of movable partition plate is measured.Using electromagnetic loading device load control is more accurate, and real-time adjustable, and through valve control drainage system can better simulate various situations in actual engineering.

A full-automatic stress path triaxial apparatus includes a main frame, a loading device and a confining pressure control device; the main frame includes an upper main beam, a surrounding rod and a lower base, the surrounding rod is connected to the upper main beam and is fixed on the lower base by screwing, a plurality of threaded holes are arranged on the lower base for fixing the surrounding rod into different shapes, a plurality of drainage channels are arranged on the lower base, a filter element is arranged on the upper side of the drainage channel to prevent soil loss, the lower side of the drainage channel is connected to the lower base for drainage, the loading device uses an electromagnetic load one and an electromagnetic load two, the electromagnetic load one is arranged below the upper main beam, a pad is arranged above the soil, the electromagnetic load two is arranged above the pad, and the electromagnetic load one and the electromagnetic load two are oppositely arranged; the confining pressure control device includes a rubber air bag and a fixing rod, the fixing mode of the fixing rod is consistent with the fixing mode of the surrounding rod, and the rubber air bag is placed inside the fixing rod, thereby improving the test precision, simulation capability and operation convenience.

The application aims to provide a pressure-stable methanol variable injection integrated injector, belonging to the field of engines. A two-stage balance valve control structure and a nested double needle valve injection structure are adopted. The control valve is directly driven by an electromagnetic unit to control the on-off of a control pressure control circuit; two needle valves are independently controlled by two electromagnetic valves to independently operate, so that the methanol injection realizes multiple injection modes of pre-injection, main injection and post-injection, and the flexible regulation of the injection amount can be realized through the time sequence superposition of the flow of the two. The application strictly isolates the control oil and the injection fuel through a double hydraulic sealing barrier to effectively solve the problems of high-pressure internal leakage and pressure maintenance according to the characteristics of low viscosity, high vapor pressure and poor lubricity of methanol; the electromagnetic load is small and the response is fast; the hydraulic drive of the main needle valve is stable and reliable. The application is particularly suitable for high-performance injection systems of difficult-to-seal fuels such as methanol.

The invention discloses a large-gap magnetic latching relay with double groups of coils, and belongs to the technical field of relays. The electromagnetic driving structure is mounted on one side in the supporting piece base; the electromagnetic pushing structure is connected with the electromagnetic driving structure and is arranged in the supporting piece base; the moving plate structure is arranged in the electromagnetic pushing structure and is mounted in the supporting piece base; the static piece structure abuts against the moving piece structure and extends to the outer side of the supporting piece base, a cover plate is installed on the top of the electromagnetic pushing structure, a shielding cover is installed on the top of the supporting piece base, and an arc chute located in the supporting piece base is installed on the outer side of the moving piece structure. According to the invention, through the two groups of electromagnetic enameled wires and the two groups of coil frameworks matched with the two groups of electromagnetic enameled wires, the electromagnetic load, the electrical clearance and the creepage distance are larger, and the requirements of different use working conditions can be met. And meanwhile, the ablation of the electric arc can be effectively blocked, so that the service life and the safety of the relay are improved.