368results about How to "Reduce fever" patented technology

The invention discloses a three-phase permanent magnet synchronous motor full-speed-domain driving control system and a control method thereof. The system is composed of a torque limiting module, a full-speed-domain control neural network module, a current control module, a coordinate transformation module-I, a coordinate transformation module-II, a coordinate inverse transformation module, an SVPWM module, a SiC MOSFET driving module, a full-speed-domain position rotating speed observation module, a weak magnetic feedback module and a three-phase permanent magnet synchronous motor. The control method is used for driving the control system. According to the method, accurate tracing of the optimal dq-axis reference current working point is realized based on deep learning, and accurate control of three operation modes of MTPA, field weakening control and MTPV is realized; an improved mobile vision field estimation algorithm is adopted, and the rotor position and the rotor rotating speed are accurately estimated within the full-speed domain range; the SiC MOSFET is used as an inverter switching tube, and a brand new drive circuit is designed to adapt to the operation condition of the electric vehicle.

The utility model relates to the field of circuit protection, in particular to a contactor integrated with an excitation function, and an excitation ignition assembly, a first piston, a first conductive part, an auxiliary contact system, a push rod, a melt, an air passage, a second piston and an elastic part are integrated in the contactor. The melt and the auxiliary contact system are connected in series and then are connected in series between the two static contacts. In a normal working state, the auxiliary contact system is insulated and disconnected, when an overload current, a short-circuit current or an abnormal condition occurs, the ignition assembly is excited to act to drive the first piston and the first conductive piece to move, the first conductive piece enables the auxiliary contact system to be conducted and closed, and the melt is connected into a main loop in a parallel connection mode; and then the second piston and the elastic piece are driven to displace through the air passage, so that the contact system is switched off, the elastic piece generates irreversible deformation, and the first piston and the first conductive piece push the push rod to disconnect the melt. According to the invention, the power loss is low, zero-current cut-off of a main loop can be realized, and the breaking capacity and the breaking reliability are improved.

The invention discloses a charging pile monitoring system based on artificial intelligence, which relates to the field of charging pile monitoring and comprises a data acquisition module, a user demand analysis module, a charging index analysis module, a temperature monitoring and adjusting module, a charging state monitoring and early warning module, a man-machine interaction platform and a database. A charging demand alternative set, a temperature state value and a charging state value of a charging pile corresponding to a charging pile user are obtained by judging and analyzing a charging pile user behavior characteristic demand parameter and a charging pile user charging association demand parameter and then counting and analyzing a charging pile temperature state parameter and a charging pile charging state parameter; the charging pile can be ensured to operate in a proper temperature range interval, the charging pile can immediately remind a worker in an abnormal working state, the working pressure and heating of internal elements of the charging pile are reduced in a low charging peak period, the stability of a power grid of the charging pile is ensured in a high charging peak period, and the service life of the charging pile is prolonged.

The battery top cover for the secondary battery comprises a positive / negative terminal, a top cover substrate and a lower plastic part, the positive / negative terminal comprises a plane part and a protruding part formed by stamping, and the back surface of the protruding part is provided with a concave part; the protruding part of the terminal penetrates through the top cover substrate and the lower plastic part, the lower end of the terminal can be connected with the switching piece when the battery is assembled, and the plane part of the terminal is matched with the switching piece to clamp the top cover substrate and the lower plastic part; a positive / negative insulating ring, a fixing ring and a sealing ring are sleeved on the protruding part of the terminal; a plurality of upper bulges matched with the terminals and lower bulges matched with the top cover substrate are respectively arranged on the upper surface and the lower surface of the positive / negative electrode insulating ring; the array radiuses of the upper bulges and the lower bulges are different; a plurality of lower grooves matched with the upper bulges are formed in the plane part of the terminal; a plurality of upper grooves matched with the lower bulges are formed in the top cover substrate; an annular bulge is arranged on the upper surface of the fixing ring; sawtooth structures are arranged on the inner circumferential wall and the outer circumferential wall of the annular protrusion. According to the utility model, the simplification and integration of the structure are realized, and the performance and the manufacturing efficiency of the battery cell top cover are improved.

The utility model relates to the technical field of machining, and particularly discloses a handheld servo electric screwdriver which comprises an electric screwdriver cap, a servo motor, an electric screwdriver handheld portion and an electric screwdriver chuck portion which are sequentially arranged from top to bottom, and the electric screwdriver cap is provided with an aviation plug, a start-stop photoelectric control panel, a start-stop switch and a forward and reverse rotation switch. The aviation plug, the servo motor, the start-stop switch and the forward and reverse rotation switch are all electrically connected with the start-stop photoelectric control panel, the servo motor is in transmission connection with an electric screwdriver chuck main shaft through a transmission shaft, and an electric screwdriver chuck push-pull sleeve is arranged at the bottom of the electric screwdriver chuck part. The bottom of the electric screwdriver chuck main shaft is located on the inner side of the electric screwdriver chuck push-pull sleeve. The start-stop switch and the forward and reverse rotation switch are arranged to control start-stop and forward and reverse rotation of the servo motor, the servo motor drives the electric screwdriver chuck main shaft to rotate to output torsion, the torque is large, the rotating speed is moderate, heating is small, mechanical abrasion is avoided, and therefore the service life is long, and the failure rate is low.

The invention discloses a new energy automobile charging management system, and aims to improve the charging efficiency, prolong the service life of a battery and improve the user experience. The system comprises a battery monitoring module, a charging mode management module, an intelligent scheduling module, a remote control module, a safety protection module, a big data analysis module and a billing management module. The battery monitoring module collects data such as battery voltage, current and temperature in real time; the charging mode management module dynamically selects a fast, standard or slow charging mode according to the battery state and the user demand; the intelligent scheduling module optimizes a multi-vehicle charging sequence to realize reasonable resource allocation; the safety protection module provides overvoltage, overcurrent and temperature protection to ensure charging safety; the remote control module enables a user to monitor and adjust the charging state in real time. According to the invention, through intelligent charging management, resource configuration optimization, charging efficiency improvement, safety risk reduction in the charging process and battery life prolonging, convenient charging experience is provided for users.

The utility model relates to the technical field of light feeding devices, in particular to an eye-closed three-dimensional light feeding LED device, which is characterized in that a pupil LED chip group comprises a red light chip and a near-infrared light chip with the wavelength range of 625nm to 960nm; a pupil LED chip set, an eyelash LED chip set and a meibomian gland LED chip set are fixedly installed on the pupil aluminum substrate, and forced eye closing distance control hair is arranged on the pupil aluminum substrate. A lens aluminum substrate and an eyebrow acupoint aluminum substrate are mounted on the lens seat; the system further comprises an integrated control circuit. By using the red light chip, the optical power density comparable to that of laser and the effective irradiation area larger than that of the laser can be obtained, and the alignment precision of a light source to acupuncture points is reduced; by utilizing the blood activating function of dark red and near-infrared light, myopia, eyebrow thickening and eyelash thickening can be prevented and controlled; health care can be carried out on meibomian glands and a suspension tough system, and light stimulation can be carried out on eye protection acupuncture points; all-directional three-dimensional light feeding can be realized anytime and anywhere; the safety values under various limit conditions refer to three kinds of sunlight.

The invention relates to the technical field of electrolytic capacitors, in particular to a high-frequency rapid charge and discharge aluminum electrolytic capacitor for a servo motor and a manufacturing method, the high-frequency rapid charge and discharge aluminum electrolytic capacitor comprises an anode foil, a cathode foil, a capacitor shell and electrolyte, porous electrolytic paper is arranged between the anode foil and the cathode foil, and oxide film layers are arranged on two sides of the anode foil. A stable and compact oxidation film is generated on the surface of the anode foil through the phosphoric acid formation liquid, so that the anode foil can withstand high-current impact, and the charging and discharging speed is greatly improved. According to the high-frequency rapid charging and discharging aluminum electrolytic capacitor for the servo motor and the manufacturing method, the high-frequency rapid charging and discharging aluminum electrolytic capacitor for the servo motor has excellent rapid charging and discharging performance, high voltage resistance, good temperature stability, long service life, high reliability and good heat dissipation performance.

The invention relates to a heat dissipation optimization method and system for a radio frequency front-end module and related equipment. The method comprises the following steps: acquiring a layout of a power amplifier in the radio frequency front-end module; continuously dividing the layout into a plurality of temperature regions according to the thermal performance of the power amplifier; obtaining an original spacing between transistors in the power amplifier; according to the original spacing, transistor optimized spacing between the transistors in the different temperature areas is obtained again; rearranging the transistors of the power amplifier according to the optimized intervals of the transistors to obtain an optimized layout; and obtaining the optimized heat dissipation optimization radio frequency front-end module according to the optimized layout. According to the invention, the layout of the transistors in the power amplifier is adjusted, so that the distance between the transistors with relatively high heat is enlarged, and the radio frequency performance of the radio frequency front-end module is improved.

The utility model discloses a trimming device with pressure detection, which comprises a trimmer driving unit arranged on a trimmer base; the dresser execution unit is connected with the dresser driving unit through an output shaft, can circumferentially rotate around the axis of the dresser execution unit under the driving of the dresser driving unit, and can generate axial downward pressure under the driving of the dresser base; a sensor; the dynamic force conduction unit is arranged between the sensor and the dresser execution unit, at least part of the dynamic force conduction unit is matched with the sensor and used for installing and positioning the sensor, and at least part of the dynamic force conduction unit makes contact with the dresser execution unit and the sensor so that the axial pressure of the dresser execution unit can be transmitted to the sensor; and the relative static state of the sensor is kept. Through the arrangement of the dynamic force conduction unit, the rotation action of the dresser execution unit and the downward pressing action of the dresser execution unit on the polishing pad are relatively independent, and it is ensured that the sensor can accurately feed back the downward pressing force.

The invention discloses an energy supply transformer and a monitoring system and method. The energy conversion unit comprises a shell, a sealing terminal, and an iron core, a primary winding, a secondary winding, an insulating supporting plate, an insulating limiting plate, an insulating partition plate, an insulating pad and a metal support which are arranged in the shell; the sealing terminal is arranged on the shell and is used for sealing and leading signals in the shell out of the shell; one end of the metal support is fixed with the iron core through the insulation pad, and the other end of the metal support is fixed on the inner wall of the shell; the primary winding and the secondary winding are coaxially arranged with the iron core and are sleeved outside the iron core; the insulating support plate is arranged between the winding and the iron core and fills a gap between the winding and the iron core; the insulating limiting plate and the iron core are coaxially arranged; the insulating supporting plate and the insulating limiting plate are made of high-dielectric-constant materials. And an insulating partition plate is arranged between the primary winding and the secondary winding. The invention aims to solve the problems that a cantilever beam structure is large in stress, poor in heat dissipation performance and large in boundary dimension, and a voltage-sharing capacitor needs to be arranged.

The invention discloses a buck-boost circuit, a frequency converter, electric equipment and a control method. The buck-boost circuit comprises a buck module, the input end of which is connected with a DC power supply and the output end of which is connected with a load; the input end of the boosting module is connected with the direct-current power supply, and the output end is connected with a load; and the change-over switch is arranged between the step-down module and the step-up module and is used for controlling one of the step-down module and the step-up module to be switched on according to the output voltage of the direct-current power supply and the target direct-current bus voltage. According to the invention, the voltage stress of the switching device can be reduced, thereby reducing the switching loss and the reverse recovery time of the diode, achieving the reduction of the heating of the switching tube, breaking through the frequency limitation of the switching tube, widening the switching frequency range of the switching tube, and widening the output voltage range.

The invention belongs to the technical field of charging piles, and discloses a method and system capable of adjusting the output power of a charging pile in real time. Comprising the steps of obtaining pre-stage power distribution capacity and a safety power value of a charging pile; in the charging process, the charging pile collects the power value of the electric meter in real time; the charging pile adjusts output power according to the electric meter power value and the pre-stage power distribution capacity and the safety power value of the charging pile, the actual available power supply power is calculated through the pre-stage power distribution capacity and the safety power value of the charging pile, and the actual available power supply power is compared with the electric meter power value; according to the comparison result, the output power of the charging pile is increased, the output power of the charging pile is reduced or the current power is maintained, under the condition of safe electricity utilization, the method is economical and practical, and the technical problem that in the prior art, when the actual electricity utilization power of the charging pile exceeds the preceding-stage power distribution capacity, current overload in a power supply line is caused is solved.

The utility model discloses a relay driving circuit and charging equipment, and the driving circuit is connected with a relay through a first node, and comprises a coupling module, a first driving module, a second driving module and a first current limiting module. The coupling module is used for transmitting a voltage signal of the signal input end to a sixth node or turning off a connection path between the signal input end and the sixth node; the first driving module is used for responding to a voltage signal of the sixth node to connect the first node and the third node or turn off a connection path of the two nodes; and the second driving module is used for responding to the voltage signal of the signal input end to connect the seventh node and the third node or turn off the connection path of the two nodes. The first driving module and the second driving module are driven by the same path of driving I-O signals, and compared with an existing mode that two paths of driving I-O signals are controlled respectively, control resources are saved. And the problems of low starting speed and low power reduction amplitude of the relay are solved while reliable pull-in is ensured.

The utility model relates to the field of inverter welding machines, in particular to a high-power-density welding machine power supply based on silicon carbide full-bridge inverter type double parallel inverters, which comprises a rear panel component, an upper connecting plate component, a first silicon carbide inverter component, a second silicon carbide inverter component, a front panel component and a bottom plate component. The rear panel part comprises an input switch and a cooling fan; the upper connecting plate component comprises an auxiliary power transformer, a main control board, a driving board and a rectifying and filtering device; the first silicon carbide inverter assembly comprises a first silicon carbide inverter plate, a radiator, a first high-frequency transformer, a secondary rectifying plate and a radiator; the second silicon carbide inverter assembly comprises a second silicon carbide inverter plate, a radiator, a second high-frequency transformer, a secondary rectifying plate and a radiator. Based on the innovation and change, the size and the weight of the power supply of the high-power output inverter welding machine can be greatly reduced, high power density is achieved, the production cost is reduced, and the use requirement of market portability is met.

The present invention discloses a hollow cathode high temperature heater, which is used to heat the emitter in the cathode tube, and comprises: an insulating liner, a heating element, a skeleton, and a multi-layer carbon felt heat shielding layer, which are coaxially nested and assembled from the inside to the outside; the insulating liner and the skeleton are both high temperature resistant insulating ceramics; the heating section, lead end and lead fixing of the heating element are integrally processed with isostatic high-density graphite, and the cross-section of the lead end of the heating element is significantly larger than that of the heating section; the insulating liner is a thin-walled cylinder, which is completely and tightly fitted with the inner wall of the heating element and the outer wall of the cathode tube, and the insulating liner and the ceramic skeleton realize structural clamping and reliable insulation of the heating element. The present invention uses isostatic high-density graphite as the heating element, which has low cost, high reliability, strong high temperature resistance, high heating efficiency, and long service life. The design of the lead end, insulating liner, skeleton, and heat shielding layer improves the efficiency of inward heat conduction, reduces unnecessary heating and heat dissipation, and has a simple process and is easy to manufacture, assemble and debug.

The invention relates to an intelligent motor overload and overvoltage absorption circuit with protection and a control method thereof, and the circuit comprises a control module, a preset protection voltage adjustment module, a voltage sampling module, a voltage comparison module, an overtime and overvoltage judgment module, and a power absorption module. A comparison signal output end of the voltage comparison module is connected with a comparison signal input end of the overtime overvoltage judgment module, a judgment signal output end of the overtime overvoltage judgment module is connected with a controlled end of the power absorption module, and a sampling signal output end of the overtime overvoltage judgment module is connected with a sampling signal input end of the control module. The overtime control signal output end of the control module is connected with the overtime control signal input end of the overtime overvoltage judgment module, and the overtime overvoltage judgment module not only can monitor the occurrence of an overload overvoltage signal, but also can judge the duration of the signal, thereby avoiding the long-time conduction of a resistor, and improving the reliability of the circuit. The problem of overheating or burnout caused by continuous conduction of a resistor in traditional hardware protection is solved.

The invention is applied to the technical field of product communication, and discloses an FPGA (Field Programmable Gate Array)-based LCD (Liquid Crystal Display) screen replacement OLED (Organic Light Emitting Diode) system, which comprises an MIPI (Mobile Industry Processor Interface) decoding unit, an RAM (Random Access Memory) image cache unit, a clock recovery unit, a scaling interpolation unit, an output time sequence unit, an MIPI coding unit, a screen command unit and an ADC (Analog to Digital Converter) sampling unit, and the FPGA selected by the system is only Lattice-XO3. According to the FPGA-based system for replacing the OLED with the LCD screen, the problem that the resolution ratios of the LCD screen and the OLED screen are inconsistent is solved by adopting the scaling interpolation unit based on the RAM cache in the FPGA, high flexibility and adaptability are achieved, the system guarantees the quality and integrity of images through accurate interpolation calculation and scaling processing, the visual experience is improved, and the system is suitable for popularization and application. And the user can fully utilize the advantage of high resolution of the OLED screen after replacing the screen, and meanwhile, the problems of image deformation, blurring or incomplete display and the like possibly caused by mismatching of the resolution are avoided.

The utility model relates to the technical field of automobile output shafts, and discloses an automobile output shaft with torque overload protection, which comprises an output shaft body, one end of the output shaft body is fixedly connected with a coupler, one end of the coupler far away from the output shaft body is fixedly connected with a connecting shaft, and one end of the connecting shaft far away from the coupler is fixedly connected with a transmission column. A spline shaft is fixedly connected to the end, away from the transmission column, of the fixed shaft, a spline sleeve is slidably connected to the outer side of the spline shaft, a spring is fixedly connected to one end of the spline sleeve, a disc spring is fixedly connected to the end, away from the spline sleeve, of the spring, and a tooth column is fixedly connected to the end, away from the spring, of the disc spring; high-frequency small-amplitude torque fluctuation is absorbed through the springs, the disc springs cope with low-frequency large-amplitude overload impact, the springs and the disc springs are connected in series to form a graded protection mechanism of flexible buffering and rigid torque limiting, and then the torque overload protection effect is achieved.

The utility model discloses a circuit board assembly with stable power interface connection. The circuit board assembly comprises a housing, a circuit board assembly, a power interface and a reinforcing assembly. The beneficial effects of the utility model are that through the arrangement of the reinforcing assembly, the power supply interface has a dust protection function, and after a power plug is inserted into the power supply interface, the power plug can be vertically reinforced by using the elastic clamping rod, thereby effectively preventing poor contact between the power plug and the circuit board assembly caused by loose connection of the power plug; and in the using process of the transparent protection plate, the effects of stable placement and efficient dust prevention are achieved through a gravity plate fixed to the bottom, the reinforcing assembly is simple in structure, efficient and high in practicability, the multiple sets of reinforcing assemblies can be conveniently connected end to end through the arrangement of mounting pieces, integrated storage of the multiple sets of reinforcing assemblies is achieved, the reinforcing assemblies are prevented from being lost, and the practicability is high. The embedded plate is embedded into the connecting groove in the other reinforcing assembly, embedded connection is achieved, and integrated placement of the multiple reinforcing assemblies is achieved.

The invention discloses a pharmaceutical composition for redness removal and repair and a preparation method thereof, belonging to the technical field of skin disease treatment, which is an ointment prepared from raw materials according to the following weight ratio: 8-10 parts of chamomile, 6-12 parts of oriental rhizome, 5-10 parts of sophora flavescens, 6-12 parts of cnidium monnieri, 6-15 parts of kochia scoparia, 1-5 parts of small molecule sodium hyaluronate, 9-15 parts of ectoine, 3-10 parts of safflower, 6-12 parts of ophiopogon japonicus, 9-12 parts of mountain peony, 9-12 parts of white peony; the ointment is composed of an ointment matrix, a nanostructured lipid carrier of a Chinese medicine extract and glycerol, and the ointment matrix is ​​honey. The pharmaceutical composition for redness removal and repair finally prepared can increase the thickness of the stratum corneum, has a good healing effect on patients with persistent facial flushing and already formed telangiectasia, and can remove redness from the face.

The utility model discloses a bearing penetrates cover and bearing assembly for dry -type continuous casting, this bearing penetrates cover includes: the whole is hollow's cover body of gyroid, the cover body has opposite first side and second side along the first direction, the first side forms the through -hole of variable aperture to the second side, the through -hole includes first hole section and second hole section who set up in order from the first side to the second side, the inner diameter of first hole section is less than the inner diameter of second hole section, the inner wall of first hole section is opposite and forms the sealing groove, the outer surface of cover body is provided with the lap joint, the bearing penetrates cover is used for embedding installation in the bearing seat, and the lap joint is used for abutting in bearing seat, penetrates the cover sealing piece, the cover sealing piece is metal sealing piece, and the cover sealing piece installs in sealing groove. The application can effectively improve the reliability of bearing penetrates cover when using, and then improve the service life greatly.

The present invention belongs to the technical field of superconducting magnets, and discloses a winding component for rapid excitation of a dry-cooled superconducting magnet, in which the outer wall cold-conducting fins and the inner wall cold-conducting fins of the coil are both strip-shaped arc structures. It is used to conduct cooling to the outer wall and inner wall of the superconducting coil, and is fixed on an insulating cold-conducting plate made of insulating material with high thermal conductivity in conjunction with upper and lower metal pressing blocks with high thermal conductivity, thereby achieving effective fixation of the outer wall cold-conducting fins and the inner wall cold-conducting fins of the coil, ensuring that the inner wall cold-conducting fins of the coil can be deformed in coordination with the superconducting coil during the excitation process without peeling off, and also achieving electrical insulation between the outer wall cold-conducting fins of the coil and the inner wall cold-conducting fins of the coil, solving the problem of cold-conducting failure of the inner wall of the coil during the excitation process and the problem of electrical connection of large-area metal cold-conducting materials, blocking the eddy current induced in the cooling structure of the superconducting magnet during the excitation process, achieving heat conduction between the outer wall cold-conducting fins and the inner wall cold-conducting fins of the coil, and optimizing the cold distribution thereof.

This invention discloses a stator assembly, a motor, a compressor, and a refrigeration device, relating to the field of induction motor technology. The stator assembly includes a stator core and stator windings. The stator core has Q stator slots, which are divided into large slots and small slots according to their cross-sectional area. The stator windings include concentrically wound main windings and auxiliary windings. The main windings have m coils, and the auxiliary windings have n coils. The main windings are numbered B1, B2, B3...B according to their winding span from largest to smallest. m The secondary windings are numbered A1, A2, A3, ... A, according to their winding span from largest to smallest. n ;B2 to B m In the stator slots where the coils are located, there is at least one single main winding slot, and each single main winding slot contains only the main winding. At least one of the single main winding slots is a minor slot; 16≦Q≦32, 3≦m≦14, 3≦n≦12. The technical solution provided by this invention is used to reduce the harmonic ratio of the motor, thereby reducing motor heat generation and improving motor efficiency.

The present invention relates to the technical field of piezoelectric pumps, and in particular to a piezoelectric fluid pump, comprising a fluid excitation unit and at least one opposing plate; the fluid excitation unit comprises a piezoelectric sheet, a substrate, a spacer and a diaphragm, and the piezoelectric sheet and the substrate constitute an actuator; a pump chamber is formed between the opposing plate and the diaphragm; at least two holes connected to the pump chamber are penetrated in the area of ​​the opposing plate opposite to the diaphragm, and the holes are inlets or outlets, wherein at least one hole is an inlet, and another at least one hole is an outlet, and at least one hole is provided with a one-way valve; the piezoelectric fluid pump of the present invention uses a diaphragm as an excitation source for exciting the fluid in the pump chamber to produce pressure changes, and the diaphragm is fixedly connected to the actuator through the spacer. Under this structure, the extremely small vibration displacement of the actuator can cause the diaphragm to produce several times or even dozens of times the vibration displacement of the actuator, thereby greatly improving the volume change of the pump chamber during operation, thereby greatly improving the output flow rate.

The utility model provides a kind of high-temperature-resistant long-life ball bearing retainer, it is related to bearing retainer technical field, and it includes: hold frame body;The retainer body is annular structure, and ball hole is arranged in annular array shape on the inner wall of retainer body;Annular array shape is arranged in the through hole of the outer wall of retainer body, and the through hole is circular hole structure, and the through hole arranged in annular array shape is jointly composed of the heat dissipation structure of retainer body.Utilize nickel-based alloy high melting point (1300 DEG C above) and strong oxidation resistance, so that retainer is not easy to heat softening or oxidation corrosion failure under high temperature working condition (such as industrial kiln, aeroengine), directly prolongs the service life under high temperature environment;Through type circular through hole forms three-dimensional heat dissipation channel, cooperates the forced convection of lubricating medium (oil / gas), and internal heat is quickly taken away.For example in high-speed motor, airflow passes through through hole can make retainer temperature reduce 20%~30%, avoid local overheating to cause material failure.

The present invention discloses a dual-variable power source hydraulic system and control method for an electric loader boom, belonging to the field of energy-saving technology for electric engineering machinery. The hydraulic system configuration is composed of a permanent magnet synchronous servo motor and an electro-hydraulic proportional variable device to form a dual-variable power source direct-drive arm hydraulic cylinder. The one-way valve realizes the oil cylinder, motor oil replenishment and flow reproduction functions according to the hydraulic cylinder working condition. The direct-acting overflow valve realizes the overflow protection of the hydraulic system. The two-position two-way electromagnetic reversing valve realizes the hydraulic cylinder pressure-maintaining function. The control method of the hydraulic system configuration is that the host computer outputs the target instruction to the dual-variable parameter optimization controller, and then the dual-variable parameter optimization controller outputs the optimal speed or displacement signal to the motor pump group, and the pressure closed loop is realized by feedback of the pressure signal by the pump outlet pressure sensor. The present invention can effectively realize the energy recovery function in configuration, and can greatly improve the energy efficiency characteristics of the power source in control method, and effectively improve the endurance time of the electric loader.

The invention discloses a high-dielectric low-loss dielectric material for a high-voltage ceramic capacitor, and relates to the technical field of dielectric materials, which comprises the following steps: S1, preparing bismuth stannate; step S2, preparation of bismuth titanate; step S3, preparation of barium zirconate; step S4, compression molding and sintering; and S5, printing an electrode. The high-dielectric low-loss dielectric material for the high-voltage ceramic capacitor is high in dielectric constant and low in dielectric loss, and meets N4700 temperature characteristics and environmental protection requirements.

This invention provides a solar-powered full-spectrum frequency-division thermo-electric combined-drive air conditioning system and its control method, belonging to the field of solar heat pumps. It addresses the problems of existing solar-powered jet-compression combined refrigeration systems, which cannot effectively utilize all wavelengths of solar energy, suffer from intermittent instability during power supply, and exhibit low cooling efficiency due to excessively high compression ratios under high temperature difference conditions. During conventional cooling, the system allows selection of single-jet cooling, single-compression cooling, jet-compression combined cooling, or dual-jet-compression combined cooling based on daytime or nighttime conditions and cooling requirements, achieving stable all-weather air conditioning while saving energy. In addition to the conventional cooling mode, a dual-jet-compression cooling mode can be operated to achieve high temperature difference cooling while maintaining a constant compression ratio. It fully utilizes solar thermo-electricity for self-generation and consumption, enabling switching between jet and compression air conditioning modes to ensure all-weather air conditioning needs while achieving energy conservation and emission reduction.

The application belongs to a valve structure, and aims at the technical problem that the existing electromagnetic valve for satellites is difficult to balance in response speed, power consumption, weight, environmental adaptability and long-term reliability, and provides a special medium axial flow self-locking electromagnetic valve for satellites, which adopts open coil, close coil and permanent magnet cooperation to drive the axial movement of armature, and keeps the valve open or closed after power off, so as to reduce the continuous power consumption and improve the reliability in satellite application. The axial flow fluid channel is formed through the internal channel of the framework, the peripheral channel of the armature and the internal channel of the valve seat assembly, so as to reduce the flow resistance and improve the medium flow capacity. The valve core and the valve seat assembly sealing surface are coaxially matched, the pre-tightening and buffering effect of the elastic member are beneficial to improve the sealing stability, reduce the impact wear and prolong the service life.