716 results about "Power density" patented technology

The invention provides a permanent magnet motor and a scroll inverter compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator core comprises stator teeth and a stator yoke which are uniformly distributed along the circumference, fluid through grooves are formed in the outer side of the stator yoke at the tops of the stator teeth, stator grooves are formed in two adjacent stator teeth and the stator yoke between the two stator teeth, and a plurality of strands of conductive circular enameled wires are embedded in each stator groove; the outer side of the rotor core is composed of linear segments and arcs, air grooves which are evenly distributed are formed in the rotor core, non-uniform magnetic isolation bridges are formed between the air grooves and the linear segments on the outer side of the rotor core, a certain distance is formed between every two adjacent air grooves, parallel magnetic conductive ribs are formed, and permanent magnets with the magnetic field directions changing alternately are embedded in the air grooves. A rivet hole, a lightening hole and a shaft hole are arranged close to the inner side of the rotor core. Therefore, the defined proportionality coefficient Ks is kept in a reasonable range, the power density of the motor can be increased, the cost is reduced, and the efficiency is improved.

The invention provides a rotor iron core, a permanent magnet motor and an inverter compressor, and relates to the technical field of motor and compressor design and manufacture, the rotor iron core comprises uniformly distributed permanent magnet grooves, a groove is arranged between two adjacent permanent magnet grooves, each groove extends inwards along the radial direction of the rotor iron core, parallel magnetic bridges are arranged between the grooves and the permanent magnet grooves, and the permanent magnet grooves are connected with the parallel magnetic bridges. A first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are symmetrically distributed are formed in the two sides of the top of each permanent magnet groove respectively, a first arc and a second arc are arranged on the outer side of the rotor core above the magnetic barrier grooves, the second arc intersects with the side edge of the groove, and permanent magnets with alternating magnetism are embedded in the permanent magnet grooves. The radius Rr of the outer side of the rotor iron core, the distance ho from the middle point of the bottom of the permanent magnet groove to the center point of the rotor iron core and the thickness hm of the permanent magnet meet the condition that (Rr-ho) / hm is larger than 2 and smaller than or equal to 3.4. By reasonably arranging the position and the size of the magnetic barrier groove, magnetic circuit distribution can be changed, magnetic flux leakage can be reduced, the power density of the motor can be increased, and electromagnetic vibration noise of the motor and the compressor can be reduced.

The invention belongs to the technical field of robot and intelligent equipment driving, and discloses an integrated servo push rod and a control method.A push rod module is integrally designed, and a high-density motor, a ball push rod and a band-type brake are arranged in the push rod module. The invention has the characteristics of high power density, small volume, high precision, high response speed, low noise, long service life, high reliability and the like. The inside of the push rod is contacted with the deep groove ball bearing at the tail end of the screw rod through the ball retainer, and the outside is contacted with the oil-free bushing, so that the lateral strength of the push rod is improved, friction is reduced, and operation efficiency is improved. A linear encoder is arranged at the end of the screw rod, accurate control of the tail end can be achieved, a magnetic encoder is arranged at the tail end of the motor, input and output end double-closed-loop can be achieved, precision can be improved, and errors of band-type brake in power-off response time can be compensated; the lead screw is connected with the motor through the diaphragm coupling in the motor, so that the axial space is saved, and the service life of the motor is prolonged.

The invention provides a battery structure design method. The method comprises the following steps: acquiring a target theoretical capacity of a to-be-designed battery; generating a plurality of target structure parameter combinations corresponding to the target theoretical capacity through the constructed battery simulation platform, wherein each target structure parameter combination comprises the following structure parameters: electrode thickness, hole depth, hole diameter, pore volume fraction and active substance volume fraction; constructing an initial population by taking each target structure parameter combination as an individual, constructing a fitness function by taking the minimum error between the discharge capacity predicted by the trained agent model and the target theoretical capacity as a target, and performing iterative optimization in the initial population based on the fitness value corresponding to each individual in combination with an improved genetic algorithm, and outputting an optimal target structure parameter combination after iteration is completed. Therefore, the structural design parameters of the battery can be quickly and accurately optimized, the performance and efficiency of the battery are improved, and the balance between the energy density and the power density is realized.

The invention discloses a wire connecting structure of a flat wire stator, and belongs to the technical field of energy-saving motors, the wire connecting structure comprises a stator core and a stator slot, a winding is arranged in the stator slot, the stator core and the winding form a stator, the stator is a concentrated winding type stator, the longitudinal section of the winding is of an octagonal structure, and the winding is arranged in the stator slot. And the left and right sides of the windings can be broken to reduce the number of used molds and reduce the winding difficulty of the windings, and one end of each of two outgoing lines of each group of windings is on the outer diameter side of the stator while the other end is on the inner diameter side of the stator. According to the wire connecting structure of the flat wire stator, the cross section of the winding is of an octagonal structure, folding can be carried out on the two sides, the number of molds can be reduced, the winding difficulty of the winding can be reduced, compared with a traditional winding with a rectangular cross section, the slot fullness rate can be increased by 4%-8%, the end space is small, the number of opened molds is reduced, the winding difficulty of the winding is reduced, the cost is reduced, and the slot fullness rate, the power density and the efficiency are high.

According to the motor, the power system based on the motor and the adjusting method, convex ribs are arranged on an end plate of a rotor, the rotor is used for driving the convex ribs to rotate and driving cooling lubricating oil to form forced circulation in an air gap, the heat transfer efficiency of the rotor and a stator is remarkably enhanced, and the temperature rise of the rotor and the demagnetization risk of a permanent magnet are effectively controlled; meanwhile, the lubrication condition of moving parts is improved, and energy consumption and complexity caused by an extra oil pump are avoided; through the integrated design of the motor shell and a half box body of the gear box and the communicating oil duct of the sealing plate and the gear box, a shared lubricating system is constructed, cooling lubricating oil circulation sharing and heat dissipation cooperation are achieved, the overall structure is simplified, and the system reliability is improved; on the premise that the size and the weight are not increased basically, the comprehensive benefits of improving the heat dissipation performance, simplifying the system structure and reducing the manufacturing cost are synchronously achieved, and the power module is particularly suitable for application scenes with limited space and high power density requirements.

The invention discloses a modular alternating support current converter without a bridge arm inductor and a modulation method thereof, and relates to the technical field of power electronics. According to the modular alternate support converter, a new modular alternate support converter topology is provided by reconstructing an operation mode of a traditional MMC, and the modular alternate support converter comprises three phase units; each phase unit comprises an upper bridge arm and a lower bridge arm which are connected in series; each bridge arm comprises N submodules which are connected in series; two ends of each phase unit serve as positive and negative poles of a direct-current end; the midpoint of the phase unit is connected with an AC filter inductor as a connecting end of three-phase power; the anode of the DC end is provided with a DC filter inductor. According to the modularized alternating supporting converter, a filter inductor does not need to be additionally arranged on a bridge arm, the modularized alternating supporting converter has the large capacity reduction amplitude and power density, the size is small, the power density is high in the corresponding alternating operation mode, the engineering implementation difficulty is low due to the full-modularized design, and good economical efficiency is achieved.

The invention discloses a high-efficiency single-stage bidirectional power conversion topological structure capable of realizing full-range soft switching and a control method of the high-efficiency single-stage bidirectional power conversion topological structure. In a single-stage bidirectional power conversion topology formed by double half bridges and a switch matrix, a controlled current source connected in parallel with a primary side of a second transformer is designed; the current on a bridge arm connected with the primary side of the second transformer can be effectively changed, so that the soft switching range of a switching tube on the bridge arm in a wide power transmission range is widened, and full-range soft switching in a power frequency period can be realized in any load range; the controlled current source is designed to only work before and after the switching moment of the primary side switching tube of the second transformer, the current stress of the switching tube can be effectively reduced, and meanwhile, the loss of the additional controlled current source is very small. According to the invention, the working range of the soft switching is widened, the additional loss caused by the soft switching is greatly reduced, higher efficiency and higher power density can be realized, and the cost advantage is realized.

The invention belongs to the technical field of power system recovery control, and discloses a power coordination control method of a hybrid energy storage auxiliary black-start system and a related device.According to the method, the total active power requirement of the black-start system is obtained and decomposed into three time scale components of fundamental waves, intermediate frequencies and high frequencies; the power is dynamically distributed to the lithium battery and the super capacitor, the distributed power is corrected based on the temperature, the operation time and the rated parameters, and finally the frequency change rate and the direct-current voltage change rate are calculated according to the actual power instruction and the system parameters so that the controller can output the control quantity. By adopting the method, the contradiction between the energy and the power density of a single power supply is overcome, the response speed and the continuous power supply capability are synergistically improved, the voltage frequency instability risk caused by load input is effectively inhibited, and the reliability and the high efficiency of black start are remarkably improved by perfecting hybrid energy storage coordination control.

The invention provides an embedded power module assembly and a vehicle with the same. The embedded power module assembly includes: a plurality of copper foil layers; the number of the chips is multiple, the multiple chips are arranged among the multiple copper foil layers, part of the chips are arranged in the upper bridge areas of the copper foil layers, and the other part of the chips are arranged in the lower bridge areas of the copper foil layers; the plurality of chips are connected with one of the copper foil layers through the heat dissipation base; and the heat-conducting medium layer is arranged on the inner side of the copper foil layer close to one side of the tail end, and the heat-conducting medium layer is attached to the copper foil layer provided with the chip. The problem of high switching loss caused by large parasitic inductance of a power module in a high-power-density electric drive system in the prior art is solved.

The invention discloses a transverse magnetic flux linear motor adopting a Y-shaped iron core and a Halbach array, belongs to the field of permanent magnet linear motor design, and aims at solving the problems that a traditional transverse magnetic flux linear motor is low in permanent magnet utilization rate, large in magnetic leakage and insufficient in power density. The device comprises a primary part and a secondary part, the primary part comprises stator iron cores which are sequentially arranged in the axial direction, each stator iron core is provided with three armature modules which are evenly distributed in the circumferential direction, and each armature module comprises long armature teeth, short armature teeth and armature windings. The tail ends of the long and short teeth adopt an inclined air gap and magnetism gathering pole shoe design; the secondary part comprises a Y-shaped secondary pole iron core and a Halbach permanent magnet array on the surface of the Y-shaped secondary pole iron core, and the permanent magnet array is divided into three areas in the circumferential direction, and the three areas correspond to the three-phase armature modules of the primary part respectively; the permanent magnets in each area are formed by staggering N poles and S poles in the axial direction, and the adjacent areas are staggered in the axial direction.

The utility model relates to the technical field of motors, in particular to an integrated joint motor, which comprises a rotor comprising a rotor upper cover and magnetic steel arranged on the rotor upper cover; the harmonic reducer comprises a wave generator, a flexible gear and a gear, the wave generator is fixed on the rotor upper cover and drives the flexible gear, and the flexible gear is meshed with the gear; the connecting shaft is connected with the rotor and an output shaft of the harmonic reducer; the stator is fixedly arranged and forms an electromagnetic coupling gap with the magnetic steel; wherein the gear is fixedly connected with the output fixing seat, and the first stator is installed on the periphery of the output fixing seat and the gear. The robot joint is small in size, light in weight, high in torque output, high in output position control precision, high in power density and high in output position control precision, and is suitable for robot joints which have requirements for weight and space and are high in torque and control precision.

The invention relates to the technical field of series voltage sharing of power electronic power devices, in particular to a dynamic voltage sharing circuit of a high-voltage integrated gate commutated thyristor (IGCT) series valve group and a control method of the dynamic voltage sharing circuit of the high-voltage IGCT series valve group. The voltage is monitored in real time; the overvoltage energy release unit is used for releasing transient overvoltage energy; all the active clamping circuits are connected in series to form a clamping matrix, corresponding overvoltage energy discharge units are triggered when overvoltage is detected, and transient voltage sharing is optimized by the central controller in combination with an arbitration strategy. By improving the voltage balancing capability between the IGCT device valve group modules, transient overvoltage energy can be quickly sensed and released, the dynamic voltage balancing problem is effectively solved, the system operation stability is improved, meanwhile, the power consumption in the online operation process is remarkably reduced, the size of a heat dissipation system is reduced, and the power density of the converter valve is greatly improved.

The invention discloses an electric aircraft high-voltage power distribution control method and system, a medium and a product thereof, and relates to the technical field of high-voltage power distribution, and the method comprises the steps: receiving a DC power supply outputted by a power battery pack, and achieving the power-on soft start through a pre-charging loop; distributing electric energy to a motor controller, an auxiliary power supply module, an air conditioning system and an electric heating system through a power distribution level according to the load priority; the power distribution stage integrates multiple solid-state relays or contactors to form load branches. An independent protection unit is configured for each load branch at a load output stage, and the independent protection units monitor voltage, current and temperature parameters in real time and execute fault isolation operation when the monitored parameters exceed corresponding preset thresholds. According to the invention, high-voltage power distribution control with load priority scheduling and branch-level rapid fault isolation is realized under the condition of high power density.

The invention discloses a disc type motor, which belongs to the technical field of axial flux motors and comprises a stator and rotors arranged on two axial sides of the stator. Axial permanent magnets and circumferential permanent magnets are sequentially and alternately arranged in a rotor in the circumferential direction to form magnetization distribution of Halbach arrangement, so that an air-gap magnetic field is enhanced, inter-pole magnetic leakage is reduced, and the utilization rate of the permanent magnets is improved; after the rotor pole face is combined with the corresponding rotor pole face, the air gap flux density distribution on the two sides is approximately consistent, so that the axial magnetic pulling force difference is restrained, the high power density of the motor is guaranteed, meanwhile, double-air-gap flux density balance is achieved, the dynamic balance performance under high-speed operation is improved, noise and vibration are reduced, and the axial force balance and service life of system steady-state operation are effectively improved.

The invention discloses a multi-vehicle mobile energy storage load recovery method and system considering lane optimization control, and belongs to the technical field of power distribution network load recovery. The multi-vehicle-type mobile energy storage load recovery method considering lane optimization control comprises the steps that the power line disaster situation, available power resources and traffic road condition information of a post-disaster power distribution network and the initial position and specific vehicle information of a dispatched vehicle are acquired; comprehensively considering the power grid side load recovery quantity, the network loss and the traffic network side cost, constructing a power-traffic coupling system optimization model, and setting a penalty term to balance the benefits of the power grid side and the traffic network side; and solving the power-traffic coupling system optimization model to obtain a lane control decision and a vehicle scheduling path, and implementing lane direction control operation. According to the method, the electric vehicle and the hydrogen fuel cell vehicle are cooperated, lane optimization control is considered at the same time, advantage complementation of power density and energy density is achieved, and diversity and robustness of a mobile energy storage supply chain are ensured.

The invention relates to the technical field of power supplies, and discloses a synchronous rectification control circuit and a synchronous rectification power supply device, and the circuit comprises a power conversion module, an output current sampling module, and a PWM controller. The power conversion module comprises a follow current switch tube which is connected in parallel with two ends of a load. The output current sampling module is connected in series in a secondary winding loop and is used for collecting output current flowing through the secondary winding loop and generating an output current signal; the PWM controller is connected with the output current sampling module and is used for driving the follow current switch tube, the PWM controller is configured to compare the output current signal with a preset threshold value, and when the output current signal is greater than or equal to the preset threshold value, a first group of PWM control signals is generated to drive the follow current switch tube; and when the output current signal is smaller than the preset threshold value, stopping driving the follow current switch tube. According to the invention, no-load loss can be reduced, and the requirements of electronic products for high power density and low loss can be met.

The utility model provides a power module and electronic equipment. The power module comprises a driving assembly and a power device, the driving assembly and the power device are suitable for being arranged on the same circuit board, and the driving assembly is electrically connected with the power device. Therefore, equivalently, the driving assembly and the power device are integrated on the same circuit board, the electric connection between the driving assembly and the power device can be realized on the circuit board, the overall size of the power module can be greatly reduced, the power density of the power module is improved, and meanwhile, the driving assembly and the power device are electrically connected on the same circuit board, so that the power density of the power module is improved. Therefore, the driving path of the driving assembly for the power device can be greatly shortened, stray inductance generated by the driving path is effectively reduced, the advantages of high speed and high power of the power device are fully played, and the working performance of the power module is improved.

The invention discloses a bypass inductor echelon current limiting topology and method for solid-state power distribution equipment, relates to the technical field of power electronic distribution, and is suitable for solid-state power controllers in the fields of aerospace, new energy automobiles and industrial automation. In order to solve the problems that when a large capacitive load is started, a current peak is likely to be generated to damage a device, and an existing current limiting scheme is low in efficiency or large in size, the topology comprises an input circuit, a main power circuit, an auxiliary circuit, a current limiting circuit, an absorption circuit and a load side circuit. According to the method, the auxiliary circuit switch tube is turned on in an echelon mode, and the main switch tube is turned on to complete starting after load voltage approaches power supply voltage and reaches a non-voltage-difference condition. According to the planar inductor integrated PCB, the size is reduced, the problem of long-term heating of a resistor is solved, the TVS overvoltage protection and RC anti-interference design are matched, the current peak is effectively restrained, the system efficiency and reliability are improved, and the high-power-density and differential-pressure-free starting requirements are met.

The invention discloses a self-powered synchronous rectification active bridge, a control method thereof and a power supply system. An active bridge belongs to the technical field of power electronics and comprises a full-bridge rectifying circuit composed of four switching devices, a self-powered circuit taking electricity from an alternating current input end and a control circuit. And the control circuit detects an alternating current input phase, generates a driving signal with dead time, and controls the switching device to be alternately conducted in positive and negative half cycles to realize synchronous rectification. The self-powered circuit is preferably a charge pump, and an external auxiliary power supply is not needed. Through integration of synchronous rectification, self-power supply and intelligent control, the rectification efficiency and the power density are remarkably improved, a traditional rectifier bridge is conveniently and directly replaced through the modular design, and the high-power rectifier bridge can be widely applied to high-power scenes.

The invention discloses a liquid hydrogen high-temperature superconducting motor and magnetofluid dual-power propulsion system, and aims to solve the problems that an existing ship propulsion system is single in power mode and insufficient in power density. The system comprises a liquid hydrogen storage and supply unit, a cooling unit, an energy conversion unit, a superconducting motor propulsion unit and a magnetofluid propulsion unit, the liquid hydrogen storage and supply unit conveys liquid hydrogen to the superconducting part through the cooling loop, the liquid hydrogen is converted into hydrogen through the heat exchanger after being cooled, the energy conversion unit converts the hydrogen into electric energy and outputs the electric energy in a matched mode, and the superconducting motor propulsion unit and the magnetic fluid propulsion unit generate mechanical energy or electromagnetic force through the electric energy to drive a ship. And the superconducting component is cooled by the cooling loop. The liquid hydrogen in the system has the dual functions of a cooling medium and fuel, a coolant and fuel do not need to be additionally configured, the requirements for silence, high thrust and rapid maneuvering are met, the power density is high, the environmental protection property is good, and the system is suitable for high-performance propelling scenes such as ships, especially submarines.

This invention provides an axial-radial composite flux permanent magnet motor, relating to the field of motor technology. It includes a rotor assembly and a stator assembly. The rotor assembly includes multiple permanent magnets uniformly arranged circumferentially. Each permanent magnet includes an integrally formed axial pole segment, a first transition segment, and a radial pole segment. The stator assembly includes a stator core and stator windings. The stator core includes stator teeth uniformly arranged circumferentially. Each stator tooth includes an integrally formed axial tooth body segment, a second transition segment, and a radial tooth body segment, corresponding to the axial pole segment, the first transition segment, and the radial pole segment, respectively. The stator windings are wound on the corresponding axial tooth body segments. This invention not only reduces magnetic energy loss and improves magnetic field coupling efficiency but also increases the effective coupling area between the permanent magnets and the stator teeth, improving the motor's torque density and power density. Furthermore, it ensures stable operation and has a wide range of applications.

The application discloses a high-performance motor rotor core, comprising rotor laminations, wherein a plurality of magnetic steel slot groups are arranged on the rotor laminations in a circumferential direction; the application has simple structure and reasonable design; stress reduction structures with central symmetry characteristics are arranged to effectively guide and release main radial stress in the magnetic bridge area, optimize stress distribution, avoid fatigue cracks caused by local stress concentration, improve fatigue life and structural safety margin of the magnetic bridge, and improve NVH performance, reduce electromagnetic harmonics, and improve stability and quietness of motor operation; in addition, the overall magnetic steel slot layout is optimized to realize reasonable reduction of material use and lightweight design of the rotor core, and improve power density and dynamic response capability under the premise of guaranteeing electromagnetic performance.

The invention provides an energy regulation and control method and device of a battery and capacitor composite energy storage pump control system, and relates to the technical field of energy regulation and control of electric engineering machinery, the energy regulation and control device comprises a storage battery, a super capacitor, a direct current converter, a rectification inverter, a permanent magnet synchronous motor, an electric proportional pump motor, an overflow valve, a hydraulic control one-way valve, an energy accumulator and a hydraulic cylinder, a storage battery and a super capacitor form a composite power supply through a direct-current converter, the composite power supply drives a permanent magnet synchronous motor through a rectification inverter and drives an electric proportional pump motor to control a hydraulic cylinder, and by optimizing an energy regulation and control distribution strategy of the composite power supply and combining an energy accumulator, the energy of the hydraulic cylinder is regulated and controlled under the working conditions of starting, braking and high-power fluctuation of engineering machinery. Instantaneous high peak power is preferentially provided or absorbed by the super capacitor, and energy is supplied by the storage battery in a stable working condition. The advantages of high energy density of the battery and high power density of the super capacitor are combined, complex working conditions are effectively handled, stable operation of the system is guaranteed, the service life of the battery is remarkably prolonged, and economical efficiency is improved.

The utility model discloses a rotor punching sheet, a rotor, a motor, an electric assembly and a vehicle, the rotor punching sheet is provided with a plurality of magnetic steel groove groups, the plurality of magnetic steel groove groups are arranged at intervals in the circumferential direction of the rotor punching sheet, each magnetic steel groove group comprises a first magnetic steel groove, the first magnetic steel groove comprises a first sub-groove and a third sub-groove, and the first sub-groove and the third sub-groove are arranged at intervals. The pole arc angle of the first magnetic steel groove is alpha 1, the field angle between the first sub-groove and the third sub-groove is alpha 2, alpha 2 = k1 * alpha 1, and k1 is larger than or equal to 2.1 and smaller than or equal to 2.5; and / or a second magnetic steel groove, the second magnetic steel groove comprises a fourth sub-groove and a sixth sub-groove which are arranged at an interval, the pole arc angle of the second magnetic steel groove is alpha3, the field angle between the fourth sub-groove and the sixth sub-groove is alpha4, alpha4 = k2 * alpha3, and k2 is larger than or equal to 5.5 and smaller than or equal to 5.9. According to the rotor punching sheet of the utility model, the limit rotation speed and the power density of a rotor can be improved, and the NVH performance of a motor can be improved.

The application relates to the technical field of power supply, and discloses a synchronous rectification control circuit and a synchronous rectification power supply device, which comprise a power conversion module, an output current sampling module and a PWM controller; the power conversion module comprises a freewheeling switch tube and is connected in parallel at two ends of a load; the output current sampling module is connected in series in a secondary winding loop, is used for collecting an output current flowing through the secondary winding loop, and generates an output current signal; the PWM controller is connected with the output current sampling module and is used for driving the freewheeling switch tube; the PWM controller is configured to compare the output current signal with a preset threshold value, generate a first group of PWM control signals when the output current signal is greater than or equal to the preset threshold value, and drive the freewheeling switch tube; and stop driving the freewheeling switch tube when the output current signal is less than the preset threshold value. The application can reduce no-load loss and adapt to the demand of electronic products for high power density and low loss.

The application relates to the technical field of power electronics, in particular to a control method of a bridgeless PFC single-stage LLC resonant converter, which comprises simultaneously collecting an output voltage and a bus voltage, respectively calculating the difference from a respective preset reference voltage, inputting the difference into independent PI controllers respectively, obtaining corresponding output frequencies respectively, then performing weighted processing on the output frequencies to obtain an actual control frequency, and generating a switching tube control signal of the converter according to the actual control frequency. The application solves the problem that a traditional single-stage converter is difficult to simultaneously ensure the stability of an output voltage and the safety of a bus voltage due to the adoption of a single control loop, effectively improves the overall performance and operation reliability of the converter under complex working conditions such as grid fluctuation and load mutation. Moreover, by integrating multiple independent magnetic elements onto a composite magnetic core, the volume, weight and component quantity of the converter are significantly reduced, so that the power density is improved and the manufacturing cost is reduced.

The invention relates to the technical field of motor optimization, and discloses a multi-physics field collaborative optimization method and system for a pure electric vehicle motor based on a particle swarm, and the method comprises the steps: building a multi-physics field coupling model of the pure electric vehicle motor; initializing parameters and a particle swarm of the improved multi-target particle swarm optimization algorithm, wherein each particle represents a group of motor design variables; calling a multi-physics field coupling model to simulate each particle, and calculating an electromagnetic performance index, a thermal performance index and a structural performance index; performing non-dominated sorting on each particle according to the electromagnetic performance index, the thermal performance index and the structural performance index, and updating a Pareto solution set; updating particle positions and speeds based on a Pareto solution set, and generating a new generation of particle swarms; and judging whether the updated Pareto solution set meets a convergence condition or not, and if yes, outputting the Pareto solution set as an optimization design scheme. According to the scheme, the comprehensive reliability of the motor can be improved, and an optimal design scheme considering multi-target performance is provided for the high-power-density electric vehicle motor.

This invention belongs to the field of power electronics and electric vehicle charging technology, and discloses a bidirectional electric vehicle charger topology, control method, and system, including a grid-side module, an AC-DC module, and a DC-DC converter. The grid-side module includes a three-phase power supply from the grid, a first-phase resistor Rga, a second-phase resistor Rgb, and a third-phase resistor Rgc. The AC-DC module includes a power switching transistor group, a first capacitor C1, and a second capacitor C2. The three-phase output terminals of the grid power supply are respectively connected to the first-phase inductor Lga, the second-phase inductor Lgb, and the third-phase inductor Lgc. This invention eliminates the need for additional filtering hardware, reducing manufacturing costs, physical size, and system complexity, while improving power density and reliability. It can accurately locate and specifically compensate for critical harmonics of specific orders in the power grid, and can quickly and in real-time track and suppress dynamically changing harmonics and transient disturbances.

This invention relates to a medium-temperature solid oxide fuel cell cathode material and its preparation method. The invention employs a sol-gel method to synthesize perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The material contains PrBaCo2O with a double perovskite structure. 5+δ BaCo with single perovskite structure 0.8 Zr 0.1 Y 0.1 O 3‑δ Two phases. Multiphase Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ The sample achieved a conductivity of 100 S / cm within the operating temperature range of a mid-temperature solid oxide fuel cell. ‑1 At 700℃, the polarization impedance is 0.06 Ωcm. 2 This meets the requirements for cathode materials in solid oxide fuel cells. The electrolyte-supported single cell achieved a maximum power density of 710 mW / cm³ at 800℃. ‑2 The single cell underwent continuous and stable discharge at a constant current for 200 hours without performance degradation, demonstrating excellent output performance stability. In summary, perovskite oxide Pr 0.1 Ba 0.9 Co 0.8 Zr 0.1 Y 0.1 O 3‑δ It is a potential cathode material for intermediate-temperature solid oxide fuel cells.