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64results about How to "Realize two-way adjustment" patented technology
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Frequency modulation characteristic control policy for doubly-fed wind turbine generator-energy storage system by simulating synchronous machine
ActiveCN106374496ARealize two-way adjustmentReduce the cost of energy storage configurationSingle network parallel feeding arrangementsEnergy storageElectricityPower modulation
The invention discloses a frequency modulation characteristic control policy for a doubly-fed wind turbine generator-energy storage system by simulating a synchronous machine. The control policy is characterized by comprising the steps of establishing the doubly-fed wind turbine generator-energy storage system considering self wind power frequency modulation capacity; enabling the doubly-fed wind turbine generator-energy storage system to simulate capacity configuration of the frequency modulation characteristic of the synchronous machine, and enabling the doubly-fed wind turbine generator-energy storage system to perform frequency modulation control policy analysis and the like; establishing the doubly-fed wind turbine generator-energy storage system by analysis of the frequency modulation requirement of the system, combination of the self frequency modulation capacity of the doubly-fed wind turbine generator, and reasonable configuration of the energy storage capacity; reasonably allocating the power modulation capacity according to different frequency response time of the wind turbine generator and the energy storage system to endow the doubly-fed wind turbine generator-energy storage system with frequency response capability which is similar to that of a conventional synchronous generator so as to realize bidirectional frequency modulation; and by fully utilizing the complementary advantages of the wind turbine generator and the energy storage system under different air speeds in the aspects of frequency response speed, available frequency modulation energy and the like, lowering the energy storage configuration cost. The control policy has the advantages of scientific and reasonable property, high applicability, excellent effect and the like.
Owner:NORTHEAST DIANLI UNIVERSITY
Non-contact power transmission system based on Z-source inverter and phase-shifting control method thereof
InactiveCN101540554AImprove reliabilityRealize two-way adjustmentElectromagnetic wave systemCircuit arrangementsPhase shift controlVoltage source
The invention discloses a non-contact power transmission system based on a Z-source inverter and a phase-shifting control method thereof. A circuit is divided into a transmitting part and a receiving part by taking a coupler as a boundary. The transmitting part comprises an input direct current power supply, a Z-source network, an inverter circuit and an induction coupling primary winding, wherein a diode is connected serially behind a voltage source to prevent the reflow of current. The receiving part comprises an induction coupling secondary winding and a rectification filter circuit. In the system, the transmission power and the loading voltage of the system are reduced by driving the setting of a phase shifting angle in a pulse; and direct connection time is simultaneously added in the phase shifting angle to increase the transmission power and the loading voltage of the system, thereby realizing bidirectional adjustment of the transmission power and the loading voltage. The invention solves the problem that load can not work in a rated condition due to factors such as load change and the like in the non-contact power transmission system, and promotes the practicability progress of the non-contact power transmission technology.
Owner:DALIAN UNIV OF TECH
Halbach array parallel rotor composite excitation brushless synchronous motor
InactiveCN101572464AImprove reliabilityLarge adjustment rangeDynamo-electric machinesSynchronous motorElectric machine
The invention relates to a Halbach array parallel rotor composite excitation brushless synchronous motor, which comprises a rotor and a stator for accommodating the rotor, wherein the stator comprises a magnetic groove sleeve, an annular exciting winding and the like; the magnetic groove sleeve is fixed on a motor end cover through bolts and is not contacted with the rotor; and the annular exciting winding is fixed at the groove of the magnetic groove sleeve. The rotor consists of a rotating shaft and a Halbach rotor and an electric excitation rotor which are arranged on the rotating shaft in parallel, and the Halbach rotor comprises a non-magnetic rotor supported by the rotating shaft and a Halbach array permanent magnet arranged on the surface of the non-magnetic rotor; the electric excitation rotor comprises a claw pole structure connected with the rotating shaft; and the Halbach rotor is separated from the electric excitation rotor by a separating magnetic ring formed by air gaps. The brushless synchronous motor can reduce the eddy current loss of the rotor, enlarge the adjustable range of a magnetic field and improve the power density of the motor, and has the advantages of high reliability and good energy-saving effect.
Owner:SHANGHAI DIANJI UNIV
Portable bi-directional constant current source module
InactiveCN105528009AReduce volumeEasy to integrateElectric variable regulationSystem integrationCurrent limiting
A portable bi-directional constant current source module provided by the invention belongs to the technical field of electronic techniques. The portable bi-directional constant current source module structurally comprises a current setting circuit (1), an output control circuit (5), a final output circuit (6) and a first feedback circuit (7), and is characterized by also structurally comprising a subtracter circuit (2), a PID circuit (3), a current-limiting setting circuit (4), a second feedback circuit (8), a display drive circuit (9) and a front panel (10). The portable design is adopted, a 9-pin D-shaped interface is used as an input / output interface, the structure is compact, system integration is easy, the circuit part adopts a double negative feedback structure, so that the characteristics of stable and high output current, high safety, wide usage occasions and the like, and output current two-way regulation also can be realized.
Owner:JILIN UNIV
Ground normal-pressure equivalent thermal test method for space radiation heat exchange law
ActiveCN102564782ASimulate Space Cooling BehaviorReal space thermal environmentStructural/machines measurementHeat flowEngineering
The invention belongs to the technical field of a spacecraft thermal test, and relates to a ground normal-pressure equivalent thermal test method for the space radiation heat exchange law. Through the invention, the shortcoming that the simulation of the space radiation heat exchange law can not be realized in the ground normal-pressure environment can be overcome, and the simulation of the cooling law of a space radiator can be realized. In the invention, the basic working principle is that the cooling heat flows are equivalent, namely that the cooling heat flow of a ground cooling system is equal to that of a space cooling system; and under the condition that the ground cooling system and the space cooing system have the same inlet temperature, if the outlet temperatures of the branches of the two cooling systems are kept consistent, the cooling heat flows of the two systems can be deemed to be equivalent according to the principle of energy conservation.
Owner:BEIJING INST OF SPACECRAFT SYST ENG
Method and device for regulating screen brightness and mobile terminal
ActiveCN105204620AEasy to adjust brightnessImprove experienceInput/output for user-computer interactionGraph readingData interfaceDistance sensors
The invention discloses a method and a device for regulating screen brightness and a mobile terminal, wherein the device for regulating screen brightness comprises a data interface and a brightness regulator. The data interface is suitable for receiving distance data collected by a distance sensor, wherein the distance data indicate the distance between the distance sensor and an obstruction. The brightness regulator is suitable for judging whether the distance data collected within a predetermined duration is less than a distance threshold constantly. When determining that the distance data within the predetermined duration is less than the distance threshold constantly, the operations of regulating screen brightness is performed based on the current screen brightness. The operations of regulating screen brightness include reducing the screen brightness when the current screen brightness is highest, and raising the screen brightness when the current screen brightness is lowest. When the current screen brightness is higher than a brightness threshold and not highest, the screen brightness is raised. When the current screen brightness is lower than the brightness threshold and not lowest, the screen brightness is reduced.
Owner:SUZHOU PINQI ELECTRONICS TECH CO LTD
Hybrid excitation three-phase brushless synchronous generator based on full wave induction excitation
ActiveCN105896833ASimple structureStrong reliabilityAssociation with control/drive circuitsGenerator control by field variationPower flowFull wave
The invention discloses a hybrid excitation three-phase brushless synchronous generator based on full wave induction excitation. The direction, magnitude and cycle of a current applied to a stator excitation winding change, the direction of a built induction excitation magnetic field changes with the rotation of a rotor magnetic pole, so that an induction current is generated on a rotor winding and can be maintained in the same direction all the time, and the rotor induction winding generates magnetic potential which is the same as or opposite to that of a permanent magnet, the magnetic potential and the magnetic potential of the permanent magnet are in a parallel connection relation in an air gap, and the air gap magnetic field is bidirectionally adjusted by adjustment of the excitation magnetic potential to achieve parallel connection hybrid excitation. According to the hybrid excitation three-phase brushless synchronous generator, the induction magnetic potential is generated in the rotor winding according to a double-pole induction principle, the induction magnetic potential and the permanent magnet in the rotor jointly generate the air gap magnetic field, and the adjustment of the magnetic field of the motor is achieved. Through an induction excitation effect, a brush-slip ring system is omitted, and with the application of a stator excitation regulator, the rotor induction current becomes controllable full-wave current.
Owner:SHANDONG UNIV
Rotor axial regulator
InactiveCN1888451ARealize two-way adjustmentReliable lockingPump componentsPumpsBall bearingEngineering
The present invention relates to long-shaft pump, in particular, it relates to an axial regulation device of long-shaft submerged chemical pump. It is characterized by that on the described shaft a shaft sleeve is mounted, said shaft and shaft sleeve are clearance fit, the angular contact ball bearing is mounted on the shaft sleeve, the locking nut is mounted on the minor diameter end of said shaft sleeve and is used for axially positioning said angular contact ball bearing, on the major diameter end of said shaft sleeve a bearing positioning step is set, the angular contact ball bearing is positioned and mounted in the bearing positioning step, on the end pace of major diameter end of said shaft sleeve a regulation nut is mounted, on the regulation nut a locking nut also is mounted, said regulation nut and locking nut are mounted on the shaft. Said invention can utilize regulation of position of said regulation nut on the shaft to implement two-way regulation of axial gap.
Owner:SHANGHAI KAIQUAN PUMP IND GROUP
Demand side response control method based on supply and demand side time interval electricity ratio
The invention discloses a demand side response control method based on a supply and demand side time interval electricity ratio and belongs to the demand side response control technology field. The method comprises steps that firstly, an available electricity transaction plan interval is divided into multiple time intervals according to a demand side response control period, and available electricity of each time interval is calculated according to an available electricity transaction plan curve; secondly, a smallest variance of ratios of required electricity of each time interval of the available electricity transaction plan interval to available electricity is taken as a target function, for taking regard of constraints that total electricity demand in the available electricity transaction plan interval is basically unchanged and required electricity difference of adjacent time intervals is smaller than controllable electricity in the demand side response control period, an optimization calculation model of required electricity of each time interval is established, and a non-linear plan method is employed to calculate required electricity of each time interval; and lastly, a ratio of required electricity of each time interval of the available electricity transaction plan interval to the demand side response control period is taken as a demand side response active control target, and good interaction between demand side response control and an available electricity transaction plan can be realized.
Owner:SOUTHEAST UNIV
Bi-directional constant current source device based on dual negative feedback control
InactiveCN105425884AImprove stabilityImprove securityDc-dc conversionElectric variable regulationNegative feedbackComputer module
The invention relates to a bi-directional constant current source device based on dual negative feedback control, and belongs to the technical field of electronic technique. The bi-directional constant current source device structurally comprises a front panel (10), a current setting module (1), an output control module (5), a power output module (6) and a first feedback module (7), and is characterized by further structurally comprising a subtracter module (2), a PID module (3), a limited current setting module (4), a second feedback module (8) and a display driver module (9). The bi-directional constant current source device adopts the dual negative feedback structure, thereby having the characteristics of being high in output current stability, high in safety, wide in range of usage occasions and the like, the limited current setting function is achieved, and output current dual-directional regulation can be further realized.
Owner:JILIN UNIV
Grid frequency dynamic response device of electric car charging equipment
InactiveCN103762688ASimple structureLow manufacturing costBatteries circuit arrangementsElectric powerCharge and dischargePower grid
A grid frequency dynamic response device of an electric car charging equipment comprises a frequency detection module and a response control module, wherein the frequency detection module is electrically connected with an accessed grid, the response control module is electrically connected with an electric car an electric car, the frequency detection module is used for detecting the abnormal frequency of the accessed grid, and after receiving the data which are sent by the frequency detection module and are abnormal in frequency, the response control module carries out frequency response according to a response control strategy through data processing. The grid frequency dynamic response device of the electric car charging equipment is simple in structure, low in manufacturing cost, high in response speed, capable of achieving bi-directional regulation of energy and information, and high in comprehensive energy efficiency, the charging and discharging efficiency of the batteries can reach 80%, and the grid frequency dynamic response device of the electric car charging equipment can achieve alternation between up regulation and down regulation without limitation in the frequency response process, and is high in reliability of motions.
Owner:GUANGDONG POWER GRID CO LTD INFORMATION CENT
Milling cutter with adjustable finish machining face
ActiveCN102632288AImprove machining accuracyRealize two-way adjustmentMilling cuttersMilling cutterEngineering
The invention discloses a milling cutter with an adjustable finish machining face, comprising a cutter body, a cutting blade, an axial positioning block and a locking piece, wherein at least one of containing chambers capable of containing the axial positioning block are arranged on the cutter body, the axial positioning block is slidably arranged in the containing chambers, the cutting blade is arranged at one end of the axial positioning block and fixed by the locking piece, an axial driving hole is formed on the axial positioning block, the inner wall of the axial driving hole is provided with a pair of opposite axial positioning faces, the axial driving hole is internally and slidably provided with an adjusting block, the outer wall of the adjusting block is in close contact with a pair of the axial positioning faces, the adjusting block is connected with the cutter body by a dowel screw, the axial cross section of the cutter body which passes through the point of a knife of the cutting blade is a datum plane, and an inclined angle between the projection line of the central axis of the axial driving hole in the datum plane and the projection line of the central axis of the dowel screw in the datum plane is not equal to 0 degree. The milling cutter with the adjustable finish machining face has the advantages of being capable of being bilaterally adjusted, and being continuously, equivalently and gradually adjusted.
Owner:ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
Eco-aggregation type scapharca subcrenata spat breeding method
ActiveCN105766742AReduce usageEnsure safetyClimate change adaptationPisciculture and aquariaWater sourceFood safety
The invention relates to the technical field of aquaculture, in particular to an eco-aggregation type scapharca subcrenata spat breeding method. The method includes steps: taking a coastal aquaculture pond as a breeding water source, using microbial preparations for controlling water quality of the pond in a breeding process, and optimizing and reinforcing bait absorption and utilization; after larval metamorphosis, enabling larvae to directly attach to the bottom of the pond without adoption of a substratum, directly using water of the pond for breeding, feeding a small quantity of unit-cell alga baits such as platymonas for 3-5 days, stopping feeding, and enabling juveniles to be completely fed with unit-cell alga baits in water of the pond; when the juveniles grow to 3mm above, performing pond breeding or marine suspension aquaculture. By means of micro-ecology, antibiotic drugs are avoided in a whole spat breeding process, and accordingly food safety is guaranteed; nutrition optimization, natural conversion and comprehensive substitution of the artificially cultured unit-cell alga baits and the natural baits in the pond are realized; in addition, due to removal of the substratum, operation procedures are optimized.
Owner:MARINE BIOLOGY INST OF SHANDONG PROVINCE
Rehmannia root functional yoghourt, rehmannia root blueberry functional yoghourt and preparation method thereof
InactiveCN103598331AEliminate dry eyesEliminate eye fatigueMilk preparationBlueberry extractFiltration
The invention relates to rehmannia root functional yoghourt, rehmannia root blueberry functional yoghourt and a preparation method thereof. Raw materials for the yoghourt comprise milk and a rehmannia root extract or milk, the rehmannia root extract and a blueberry extract, wherein a ratio of used rehmannia root to used milk is 1.7 kg 100 L to 2.5 kg 100 L, and a ratio of the used blueberry extract to used milk is 1 kg 7 L to 1 kg 12 L. The preparation method comprises the following steps carrying out heat sterilization on a milk-containing material liquid which is composed of milk or includes milk and blueberry as main raw materials; subjecting the rehmannia root extract with stable components to filtration sterilization; mixing the sterilized milk-containing material liquid with the sterilized rehmannia root extract; and adding a starter for fermentation so as to prepare the functional yoghourt. The rehmannia root functional yoghourt has a plurality of health care effects like removal of heat to promote salivation, cooling of blood and stopping of bleeding and is rich in nutritional components; the rehmannia root blueberry functional yoghourt has a plurality of health care effects like eye protection, prevention of cranial nerve aging, strengthening of the heart, resistance to cancers, softening of blood vessels and enhancement of human immunity besides the health care effects of the rehmannia root functional yoghourt.
Owner:HENAN NORMAL UNIV
Non-contact electric energy transmission system based on Z-source inverter and phase-shifted control method of transmission system
InactiveCN102005926ARealize two-way adjustmentImprove reliabilityApparatus with intermediate ac conversionZ-source inverterPhase shift control
The invention discloses a non-contact electric energy transmission system based on a Z-source inverter and a phase-shifted control method of the transmission system. A circuit is divided into two parts of transmitting and receiving by taking a coupler as the boundary, wherein, the transmitting part comprises an input direct-current power supply, an impedance source network, an inverter circuit and an induction coupler primary winding; for preventing the current backflow, a diode is necessary to be connected behind the voltage source in series; the receiving part comprises an induction coupler vice-side winding and a rectification filter circuit. In the system, the transmission power and the load voltage of the system can be reduced by setting the phase-shifted angle in a drive pulse; and meanwhile, the transmission power and the load voltage of the system can be increased by increasing the straight-in time in the phase-shifted angle, thus realizing the bidirectional adjustment of the transmission power and the load voltage. According to the invention, the problem that the load can not operate at the rated condition because of factors such as load change and the like in the non-contact electric energy transmission system can be solved, and the practical progress of the non-contact electric energy transmission technique is promoted.
Owner:TIANJING UNIV OF TECH & EDUCATION
Halbach array parallel rotor composite excitation brushless synchronous motor
InactiveCN101572464BImprove reliabilityLarge adjustment rangeDynamo-electric machinesSynchronous motorElectric machine
Owner:SHANGHAI DIANJI UNIV
Multifunctional desk
InactiveCN103859806AAchieving positive regulationRealize reverse regulationSchool benchesSectional furnitureAgricultural engineeringSelf locking
The invention provides a multifunctional desk, belongs to the technical field of design of education furniture, and solves the problems of single function, rigid and regular appearance and inconvenience for movement of the conventional desk in a classroom. The multifunctional desk comprises a main desk board and auxiliary desk boards, which are all provided with self-locking type universal wheels, wherein a groove matched with a first turning plate is formed in the middle of the main desk board, a blocking rack is arranged at the middle bottom of the groove, and the first turning plate is hinged to two sides of the groove of the main desk board through a rotating shaft; a groove matched with a second turning plate is formed in the first turning plate, and the second turning plate is hinged to two sides of the groove of the first turning plate through the rotating shaft; the fixing end of a support clipping strip is connected to a fixing plate through the rotating shaft, and the fixing plate and the bottom of the second turning plate are fixed; chutes in a shape like 1 / 4 of arc are formed in two sides of the bottom surface of the main desk board, slider blocks, which are connected to buckles, are formed in the chutes, and the shapes of the surfaces of the auxiliary desk boards are of pole symmetric figures, and the auxiliary desk boards are fixed on two sides of the main desk board through buckles at the bottom surface. The multifunctional desk is mainly used for a school classroom.
Owner:SOUTHWEST JIAOTONG UNIV
Three-shaft six-direction adjustable tool for automobile power assembly
PendingCN110153973ARealize two-way adjustmentRealize distance adjustmentWork holdersWork benchesPowertrainElectrical and Electronics engineering
The invention discloses a three-shaft six-direction adjustable tool for an automobile power assembly. Two support frames are used as a base body of the tool, the two support frames are connected through length adjusting devices so as to realize distance adjustment between the two support frames and realize two-way adjustment in the X-axis direction, and first support adjusting devices, second support adjusting devices and third support adjusting devices are slidably mounted on first longitudinal beams and second longitudinal beams of the two support frames correspondingly for being directly connected with the power assembly in a supporting mode. The three kinds of support adjusting devices can slide along the respective longitudinal beam, two-way adjustment in the Y-axis direction is achieved, the first support adjusting device and the second support adjusting device can both achieve height adjustment, and therefore two-way adjustment in the Z-axis direction is achieved. Since the three kinds of support adjusting devices for supporting the power assembly are adjustable in position, and therefore the three-shaft six-direction adjustable tool can be adjusted according to the practical type of the power assembly so as to be applicable to power assemblies with different types, and has the advantages of being wide in application range and the like.
Owner:LIAONING JUNFENG MACHINERY MFG
Bidirectional dual-regulation fork lifter boom
ActiveCN101941660ARealize continuous adjustmentGuaranteed drop pointLifting devicesLong armEngineering
The invention relates to a bidirectional dual-regulation fork lifter boom. The fork lifter boom comprises a rear boom body and a front boom body, wherein the lower end of the rear boom body is arranged on a base bracket; the front boom body is bent; the front end of the long arm of the front boom body is connected with a hook; the upper end of the rear boom body is movably connected with the bentpoint of the front boom body; the base bracket is provided with a cylindrical regulating bracket in which a regulating rod is inserted; the upper end of the regulating rod is movably connected with the lower inside of the rear boom body; regulating holes are correspondingly arranged on the regulating bracket and regulating rod; regulating shafts are arranged in the regulating holes; the upper middle of the rear boom body is connected with the cylinder body of a telescopic oil cylinder; and the extending end of a piston rod of the telescopic oil cylinder is connected with the rear end of the short arm of the front boom body. The boom can realize the movement thereof. The continuous regulation of the lifting point can be realized by regulating the boom through the hydraulic pressure, so theaccuracy of the unloading point of the lifted cargos is ensured. The horizontal regulation of the load center is in the range of 2700 to 4000mm; and the height regulation of the lifting point above the ground is in the range of 250 to 4000mm. The boom has the advantages of rational structure design and convenient assembly and disassembly and maintenance.
Owner:ANHUI HELI CO LTD
Wind storage combined wind power converter and control method thereof
PendingCN112366748AImprove stabilityPower smoothingSingle network parallel feeding arrangementsEnergy storageCharge and dischargeWind power
The invention discloses a wind storage combined wind power converter and a control method thereof. The energy storage unit is arranged on the direct current side of the wind power converter, namely the energy storage unit is used for replacing a Chopper device in the prior art, so that the bidirectional regulation of the direct current side voltage of the wind power converter can be realized through the charging and discharging functions of the energy storage unit; therefore, the direct-current side voltage of the wind power converter is kept stable, and the stability of the wind power converter is improved. In addition, the energy storage unit can cooperate with the wind turbine generator to enable the wind storage combined wind power converter to have the function of achieving the powerauxiliary service control target, such as primary frequency modulation, energy transfer and power smoothing.
Owner:SUNGROW POWER SUPPLY CO LTD
Bidirectional dynamic voltage adjusting device
PendingCN106961111AStable load voltageOvercome inherent shortcomingsAc network voltage adjustmentCapacitanceEngineering
The invention relates to a bidirectional dynamic voltage adjusting device. The bidirectional dynamic voltage adjusting device comprises an adjusting main circuit and a DSP control circuit, and the adjusting main circuit is connected between a power grid and a load. The bidirectional dynamic voltage adjusting device comprises a first PWM converter, which is used for inflow outflow control of power grid energy; a second PWM converter, which is parallely connected with the first PWM converter by an energy storage capacitor, and is used to realize inflow outflow control of load energy under control of a DSP control circuit; a serial connection compensation transformer; a sinusoidal wave filter, which is serially connected between the serial connection compensation transformer and the load, and is used to realize filtering of high frequency pulses. The primary side of the serial connection compensation transformer is connected with the first PWM converter, and the secondary side of the serial connection compensation transformer is directly serially connected with the power grid, and voltage drop and isolation are realized, and therefore the forward compensation or the backward compensation of the load voltage is realized under the control of the DSP control circuit. Compared with the prior art, advantages of a conventional mechanical type on-load voltage regulation transformer and a contactless thyristor on-load voltage regulation device are provided, and the inherent disadvantages thereof are overcome, and good performance is provided.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
Centrifugal variable flux permanent magnet synchronous motor
ActiveCN109302033AGood magnetic effectDoes not affect energy conversion efficiencyMagnetic circuit rotating partsSynchronous machine detailsExternal energyElectric machine
The present invention relates to a centrifugal variable flux permanent magnet synchronous motor, belonging to the technical field of permanent magnet synchronous motors. A permanent magnet is locatedbetween two adjacent rotor cores and is slidingly connected with the rotor cores; one side, close to a rotor core set, of a rotary table is provided with a plurality of magnetic separation blocks which are extended towards the rotor core set along the axial direction of the rotary table and are configured to shield the permanent magnet, a plurality of racks and a plurality of racks are slidingly arranged on a hub to rotate the hub, the first racks can be moved to be engaged with the second racks along the radial direction of the hub and can drive the movement of the second racks, the first racks move to allow the rotary table to rotate relative to the hub to separate from the magnetic separation blocks from the permanent magnet, and the second racks move to allow the permanent magnet to move relative to the rotor cores. The centrifugal variable flux permanent magnet synchronous motor has a good flux regulation effect and can achieve dual-way regulation of a magnetic field with no needfor drive of external energy and additional loss and without influence of energy conversion efficiency of the motor.
Owner:JIANGXI UNIV OF SCI & TECH
Permanent magnet excitation active and reactive power control system
ActiveCN112910015ASimple structureImprove reliabilitySingle network parallel feeding arrangementsAc network load balancingSynchronous motorControl system
The invention provides a permanent magnet excitation active and reactive power control system, and belongs to the field of motors. The objective of the invention is to solve the problems of low reliability, incapability of adjusting active power and incapability of performing primary frequency modulation of the existing synchronous phase modifier. The invention relates to a permanent magnet excitation active and reactive power control system, which adopts a permanent magnet excitation synchronous motor, has no rotor excitation loss, and is simple in rotor structure, high in reliability and long in service life. The electromotive force of the grid-connected winding of the motor is detected through the sensor, meanwhile, the controller adjusts and controls the winding output current, the phase and the phase sequence of the electromotive force of the grid-connected winding are made to be the same as those of the corresponding phase voltage of the power grid, the change-over switch is closed, and the grid-connected winding is connected with the power grid. The system is used for realizing active and reactive control.
Owner:HARBIN INST OF TECH
Seat and back linkage adjusting type chair
PendingCN110301773ARealize sliding back and forthAchieve angle adjustmentStoolsReclining chairsPulp and paper industry
Owner:廖建甜
Wide-threshold damping adjustment wrist force device and using method thereof
PendingCN112426684AReduce direct connectionIncreased durabilityMuscle exercising devicesMechanical engineeringPhysics
The invention discloses a wide-threshold damping adjustment wrist force device and a using method thereof. The wide-threshold damping adjustment wrist force device comprises a holding mechanism and anadjusting mechanism arranged near the holding mechanism, the holding mechanism comprises a first holding part and a second holding part, the first holding part and the second holding part are both ofa hollow pipe structure, and the axes of the first holding part and the second holding part coincide; the diameter of the second holding part is smaller than that of the first holding part, a throughhole is formed in one end of the first holding part, the second holding part extends into the first holding part from the through hole, non-Newtonian liquid is injected into the first holding part, and a stirring mechanism is arranged on a pipe body, located in the first holding part, of the second holding part; the adjusting mechanism is arranged in the first holding part pipe body, one end of the adjusting pipe is fixedly connected with the end, without the through hole, of the first holding part, the other end of the adjusting pipe is movably connected with the end face of the telescopic end of the second holding part, and the adjusting pipe is filled with pure water. Exercise is carried out by utilizing the retarding characteristic of the non-Newtonian liquid, and the exercise effectof the equipment can be adjusted by changing the contact area and the concentration.
Owner:苏州昆卓精密制造有限公司
Bidirectional dual-regulation fork lifter boom
ActiveCN101941660BRealize continuous adjustmentGuaranteed drop pointLifting devicesLong armEngineering
Owner:ANHUI HELI CO LTD
Full-load range precise current-equalizing device
InactiveCN1112749CEasy to implementDoes not affect load regulationDc source parallel operationAudio power amplifierAverage current
The current equalizing device as one distributed DC source system includes a voltage error amplifier and a current equalizing controller. In the current equalizing controller, resistor R9 and capacitor C3 are connected parallelly between the inverse input and the output of the op-amp; R10, R11 and + 5V power source constitute a bias circuit connected to the non-inverse input of the op-amp; and R9, R10 and R11 meet the expression of R10+R11=2R9. The current equalizing device is simple, easy to design and debug; can realize the two-way regulation based on average current; has high precision in full load range; may be used in various switching circuit for outputting DC voltage.
Owner:ZTE CORP
Slow pay-off fishing tackle and using method thereof
PendingCN112335621AReal-time adjustment of pay-off speedImprove practicalityRodsReelsStructural engineeringMarine engineering
The invention discloses a slow pay-off fishing tackle and a using method thereof. The slow pay-off fishing tackle comprises a fishing rod and a pay-off mechanism close to one end of the fishing rod, the fishing rod is fixedly connected with the pay-off mechanism, and the pay-off mechanism is close to the holding end of the fishing rod; the pay-off mechanism comprises a first pay-off pipe and a second pay-off pipe, the first pay-off pipe and the second pay-off pipe are both of hollow pipe body structures, the axes of the first pay-off pipe and the second pay-off pipe coincide, the diameter of the second pay-off pipe is smaller than that of the first pay-off pipe, a through hole is formed at one end of the first pay-off pipe, the second pay-off pipe extends into the first pay-off pipe from the through hole, non-Newtonian liquid is injected into the first pay-off pipe, and a retarding mechanism is arranged on a pipe body, located in the first pay-off pipe, of the second pay-off pipe. An adjusting mechanism is further arranged in a pipe body of the first pay-off pipe, the adjusting mechanism comprises an adjusting pipe, one end of the adjusting pipe is fixedly connected with the end, without the through hole, of the first pay-off pipe, pure water is injected into the adjusting pipe, the pay-off speed can be flexibly controlled, and the physical strength of fishes can be consumed inthe pay-off process.
Owner:HUNAN RUIQI OUTDOOR PROD CO LTD
Calibration device and calibration method for gain error of SAR type ADC
ActiveCN111181564AImprove conversion accuracyRealize two-way adjustmentAnalogue/digital conversionElectric signal transmission systemsCapacitanceMechanical engineering
The invention discloses a calibration device and calibration method for gain errors of an SAR type ADC, and belongs to the field of ADC conversion gain error correction. According to the calibration device, a gain error calibration capacitor array is introduced to calibrate the gain error, such that the gain error can be effectively reduced, and the conversion precision of the ADC is improved. Thegain error calibration technology has bipolar gain error calibratability; the gain error calibration has calibration precision adjustability, and gain errors of different polarities and amplitudes can be adjusted. According to the calibration method provided by the invention, normal AD conversion is not influenced during calibration.
Owner:XIAN MICROELECTRONICS TECH INST
Deepwater ecological pond
ActiveCN111851395AReduce leakageSatisfy the function of water storageMarine site engineeringSodium BentoniteCofferdam
The invention relates to the technical field of ecological ponds and discloses a deepwater ecological pond which comprises a pond body; the pond body comprises a base layer, an impervious layer arranged on the base layer and a protective layer arranged on the impervious layer; the pond body comprises a deepwater area and a shallow water area; the vertical height from the bottom of the deepwater area to the upper end of the shallow water area is greater than 2.5 m; the impervious layer of the deepwater area comprises a sodium bentonite geosynthetic clay liner; the impervious layer of the shallow water area comprises an impervious clay layer; a permeation adjusting device is arranged at the bottom of the deepwater area and comprises a concrete cofferdam, a metal cylinder and a floating body;the impervious layer on the inner side of the concrete cofferdam is an impervious clay layer; the metal cylinder is fixed on the concrete cofferdam; and a hole is formed in the top of the metal cylinder. The deepwater ecological pond can be adapted to the high water level impervious demand, also can ensure a proper leakage rate in the low water level state, is adapted to the low water level impervious demand, does not affect bidirectional adjustment of surface water and underground water and enables the pond body to have the self cleaning capacity.
Owner:CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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