64results about How to "Realize two-way adjustment" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a seat and back linkage adjusting type chair. The chair comprises a seat, a back, armrests and a supporting seat, and is characterized in that the armrests are fixedly mountedon the two sides of the supporting seat; a connecting seat is fixedly mounted at the top of the supporting seat; a sliding chute is formed in the connecting seat; a protrusion corresponding to the sliding chute is arranged at the bottom of the seat; the seat is hinged to the bottom of the back; and the armrests are hinged to the middle of the back. According to the chair, the front-back position of the seat can be adjusted to change the angle of the back, so that the use comfort of a user can be effectively improved.

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.

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.

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.

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.