16results about How to "Guaranteed inhibitory effect" patented technology

The invention discloses a control method for a composite direct-current power synchronization grid-following type converter, and belongs to the technical field of wind power grid-connected converter control. The problem that in the prior art, a traditional converter control method based on network tracking type control is low in stability due to subsynchronous oscillation easily generated under a weak power grid is solved. According to the method, the direct-current power of the grid-following type converter is collected and sequentially passes through a lead / lag link and an integral controller, then an obtained compensation item is introduced to a d-axis current reference instruction value output by a direct-current voltage loop, d-axis current and q-axis voltage are influenced, the influenced q-axis voltage serves as phase-locked loop input, and the phase-locked loop is connected with a phase-locked loop. An output grid-connected angle is directly controlled by a proportional-integral controller of a phase-locked loop link, and an angle small signal value additionally introduced by composite direct-current power synchronization is equivalent to that a network-forming type direct-current inertia synchronization link is introduced into a network-following type phase-locked loop. The method improves the adaptability of the following network type control system to the weak power grid, and can be applied to converter control.

The present application discloses a permanent magnet synchronous motor current harmonic disturbance suppression system, method and storage medium. The system includes an extended state observer and a repetitive self-disturbance rejection controller; the extended state observer is used to obtain the current cycle disturbance observation value z2(k+1) containing a DC disturbance component and a low-frequency disturbance component, the current observation value z1(k+1) of the current cycle, and the error e1(k) between the current sampling value of the current cycle and the current observation value of the previous cycle; the repetitive self-disturbance rejection controller includes a main controller and a repetitive controller, the repetitive controller is used to receive the error e1(k), and reproduce the signal of the selected frequency based on the internal model principle, the main controller is used to receive the output signal of the repetitive controller, the current cycle disturbance observation value z2(k+1) and the current observation value z1(k+1) of the current cycle, and output the motor control instruction. The present invention has a good suppression effect on harmonic disturbances.

The invention provides dried tofu blank pressing equipment for bean product processing, which comprises a processing platform, a placing box and a pressing assembly, the placing box is movably mounted in the processing platform, the pressing assembly is fixedly mounted on one side above the processing platform, and dried tofu blanks are placed and moved for use through the arrangement of the placing box. The pressing assembly comprises a first support, a main air cylinder, a lifting plate, a pressing plate, an inner moving plate, a telescopic spring, a threaded column and an adjusting bolt, and the first support is fixedly installed on one side of the upper portion of the machining platform; according to the equipment, a main air cylinder drives a lifting plate to descend, the lifting plate drives a pressing plate to descend, water in bean products can be rapidly and conveniently squeezed out, the operation intensity of operators is reduced, an adjusting bolt is rotated, a threaded column is driven to rotate to adjust the buffer pressure of a telescopic spring, and therefore the pressing pressure on the bean products is adjusted; and the magnitude of the output pressure is controlled.

The embodiment of the invention discloses a silicon-based negative electrode material and a preparation method thereof, a negative electrode plate and a battery, and belongs to the technical field of batteries, the silicon-based negative electrode material is obtained by sintering a precursor, and the precursor comprises a silicon source, a lithium source and a fluxing agent; wherein the fluxing agent comprises lithium fluoride, and the fluxing agent accounts for 1%-8% of the total mass of the silicon source and the fluxing agent. According to the silicon-based negative electrode material provided by the invention, the volume expansion effect can be reduced, meanwhile, the integrity of an SEI film can be ensured, the loss of active lithium is reduced, and the effective energy density of a negative electrode plate and the cycling stability of the silicon-based negative electrode material are improved.

The invention provides a high-linearity amplifier with a filtering function. The high-linearity amplifier comprises an input matching network, a bias network A, a bias network B, a feedback network, a filtering network, an amplifying circuit and an output matching network, a Cascode circuit structure is adopted to form an amplifying circuit, and gain flatness and good input and output matching are guaranteed through an RC feedback network. Transistor bias voltage which slightly fluctuates along with temperature change is provided for the amplifier through the bias network A and the bias network B, so that stability of static current of the whole amplifier along with temperature change is guaranteed. The low-pass filtering function is achieved by introducing the filtering network into the amplifier, high-frequency harmonic and clutter suppression of the amplifier is improved, meanwhile, the linearity of an amplification circuit is improved by optimizing the structures of the bias network A, the bias network B and the filtering network, and the design flexibility of the amplifier is improved.

The application provides a rotor slot wedge structure of a magnetically conductive and electrically conductive alloy material, and belongs to the technical field of double-shaft excited electric machines. The magnetically conductive and electrically conductive alloy is adopted, so that the rotor slot wedge structure has both electrical conductivity and magnetic conductivity, can guarantee the damping and oscillation suppression capability of the double-shaft excited electric machine, and can also run asynchronously at a large slip. The inertia support capability of the double-shaft excited electric machine is improved, and the frequency stability of the power system is guaranteed. Compared with a traditional slot wedge structure, a cross-shaped shallow groove is arranged on the surface of the slot wedge, so that the eddy current path can be blocked and the eddy current loss of the slot wedge can be reduced when the double-shaft excited electric machine runs asynchronously at a high slip. In addition, the shallow groove also increases the contact area between the surface of the slot wedge and the air in the air gap, and improves the heat dissipation capability. The double-ventilation groove setting of the air outlet of the slot wedge and the unequal outlet diameter setting are beneficial to balancing the air flow in each radial ventilation groove, reducing the axial thermal imbalance of the rotor winding, and reducing the insulation thermal stress.

This invention discloses a backflow suppression device and an anti-backflow fan and refrigerator including the same. The backflow suppression device is used to suppress the backflow of gas from the air inlet of the fan to the outside of the fan. It includes: a flow-suppressing part, which is arranged around the outer edge of the air inlet, with one side of the flow-suppressing part rotatably connected to the outer edge of the air inlet, and the other side of the flow-suppressing part extending towards the axis of the air inlet, and the flow-suppressing part being used to rotate around the outer edge of the air inlet; and a limiting part, which is arranged around the outer edge of the air inlet, and the limiting part being used to restrict the rotation of the flow-suppressing part towards the outside of the fan. When gas backflows from the air inlet, the flow-suppressing part rotates towards the limiting part; when air enters the air inlet, the flow-suppressing part rotates towards the impeller of the fan. The flow-suppressing part can block the backflow generated in the positive pressure zone, thereby reducing eddies and the noise generated by eddies. It reduces repetitive work, thereby improving the efficiency of the fan and reducing energy consumption.

The utility model discloses a kind of brake pad wear-resistant material smearing press integrated equipment, more specifically brake pad processing technical field including equipment box, the top of the equipment box is fixedly installed with several telescopic components, the top of the equipment box is fixedly connected with clamping mechanism by several telescopic components, one side of the equipment box is fixedly installed with linear guide rail component, one side of the linear guide rail component is fixedly installed with coating mechanism, the top of the clamping mechanism is fixedly installed with press mechanism. The brake pad wear-resistant material smearing press integrated equipment, the top of clamping plate is displaced by linear guide rail component and drives coating mechanism, raw material inside coating mechanism is coated on the top of brake base plate by processing groove, then starting press mechanism is pressed into shape to the raw material between processing groove and brake base plate, in this process, control box is used to control equipment, and raw material is provided for coating mechanism by the cooperation between feed tank and feed pipe.

The present invention discloses a UWB positioning method, storage medium, device and computer program product suitable for a mixed environment of LOS and NLOS, comprising: arranging UWB base stations in a positioning environment, using the UWB base stations to measure the distance of UWB tags in the LOS environment, finding three UWB base stations with the largest sum of distances, and determining the LOS environment threshold through the Cayley-Menger determinant; at the current moment, reusing the UWB base stations to measure the distance of UWB tags, finding three UWB base stations that minimize the value of the Cayley-Menger determinant, and forming a positioning system with the UWB tags; according to the LOS environment threshold, identifying that the positioning system is in the LOS or NLOS environment, and determining the distance correction values ​​of the three UWB base stations in the positioning system; inputting the distance correction values ​​into an established new three-sided positioning solution model, obtaining the coordinates of the UWB tags, and improving the positioning accuracy.

The application provides a composite slot wedge structure for inhibiting rotor eddy current of a two-axis excitation phase modifier and a two-axis excitation motor, and belongs to the technical field of two-axis excitation motors. Compared with a traditional slot wedge structure, the two-axis excitation motor adopts a double-layer composite slot wedge structure of a hard bakelite slot wedge and an aluminum bronze slot wedge, so that the two-axis excitation motor has the damping capacity and the ability of reducing eddy current at the same time, can guarantee the damping and oscillation inhibition capacity of the two-axis excitation motor, and can also run asynchronously with a large slip. The inertia support capacity of the two-axis excitation motor is improved, and the frequency stability of a power system is guaranteed. A multi-branch path ventilation groove is alternately connected by single branches and double branches, the winding heat dissipation area is significantly increased, and the turn conductor heat dissipation coefficient is improved. The stepped auxiliary slot ventilation groove and the unequal outlet diameters of the hard bakelite slot wedge are beneficial to improving the air flow distribution uniformity in each radial ventilation groove and reducing the rotor winding axial thermal imbalance.

The application belongs to the technical field of image interpolation, and specifically discloses an image interpolation method based on double-stage disturbance and DR split expansion. The method takes a linear interpolation operator as an initialization module of a network to perform initial interpolation, maps the linear interpolation operator to a graph adjacency matrix through an interpolation operator theorem, and ensures the stability of the training process and the reliability of the interpolation result. In addition, the application introduces a double-stage optimization model of a directed graph disturbance matrix and an undirected graph disturbance matrix, and expands the model into a learnable neural network structure by using a DR split iteration algorithm, so that high-precision and interpretable image interpolation is realized. The directed graph adaptively models and corrects the connection relationship between observed pixels and pixels to be interpolated, and the undirected graph locally refines the smoothness between the pixels to be interpolated, effectively enhances the high-frequency details and overall smoothness of the image while maintaining the original structure information, and ensures the accuracy of the image interpolation result.

The present disclosure relates to a filter and a communication device, the filter comprising: an input terminal, an output terminal, a filter network disposed between the input terminal and the output terminal and comprising a series branch and a parallel branch, a first matching unit disposed between the input terminal and the filter network, and a second matching unit disposed between the input terminal and the filter network, the second matching unit is arranged between the filter network and the output terminal; the series branches comprise resonance units, one end of each parallel branch is connected to a node between the series branches, and the other end of each parallel branch is grounded; at least two parallel branches are provided with at least one common inductor, and other parallel branches, the first matching unit and the second matching unit are provided with inductors connected to the ground; at least one common inductor in the at least two parallel branches is decoupled from one of the inductors, connected to the ground, in the other parallel branches except the at least two parallel branches and the first matching unit or the second matching unit in an adjacent mode.

The utility model discloses a novel flame-retardant regenerated polyester net production device, and relates to the field of polyester net processing devices, the novel flame-retardant regenerated polyester net production device comprises a roller press rack and a workbench used for placing a polyester net, the opposite sides of the roller press rack are provided with adjusting grooves, sliding blocks are arranged in the adjusting grooves in a sliding manner, the lower parts of the sliding blocks are provided with springs, and the springs are connected with the roller press rack. An adjusting mechanism is arranged at the upper parts of the sliding blocks, and an upper roller is arranged between the two sliding blocks; a lower roller matched with the upper roller is arranged at the lower part of the roller press rack; one side of the lower roller is connected with a motor, the motor is installed on the roller press rack, and the workbench is installed between the upper roller and the lower roller and makes contact with the lower roller; the roller press rack is provided with the adjusting groove and the sliding block, and is provided with the spring and the adjusting mechanism, so that the adjusting mechanism drives the sliding block to move up and down in the adjusting groove, the distance between the upper roller and the lower roller is accurately adjusted, and the pressing effect on a polyester net is ensured.

The phase-locked loop design method based on the notch filter and the compensator of the present invention, the phase-locked loop controller includes a control constant link, a notch filter link and a compensator link, the notch filter link is used to remove the double frequency harmonic component introduced into the q-axis of the rotating synchronous coordinate system due to the low-order harmonic components of the grid voltage and the imbalance of the three-phase grid voltage, and two poles are added at the double frequency of the fundamental wave to ensure the suppression ability of the phase-locked loop to high-frequency harmonics; the compensator link introduces a pole and a zero point to solve the phase drop problem caused by the introduction of the notch filter, so that the phase-locked loop meets the phase margin requirements at the cut-off frequency. The phase-locked loop design method based on the notch filter and the compensator of the present invention can solve the problems of phase-locked loop accuracy and stability of the three-phase converter under the working conditions of high content of low-order harmonic components of the grid voltage (such as the 5th), unbalanced three-phase grid voltage, sudden changes in grid voltage, sudden changes in frequency, etc.

Provided are a pneumatic tire capable of suppressing peeling of a sealant layer and improving tire balance, and a method for manufacturing the same. In a pneumatic tire provided with an annular tread portion (1) extending in the tire circumferential direction, a pair of sidewall portions (2) disposed on both sides of the tread portion (1), and a pair of bead portions (3) disposed on the inner side of the sidewall portions (2) in the tire radial direction, a sealant layer (20) is formed on the tire inner surface (10) of the tread portion (1). The sealant layer (20) has a structure in which a strip (21) of a sealant is arranged in a spiral shape along the tire circumferential direction, and at least one end of the strip (21) is thinner than the other portions.

The invention discloses an iron-based coordination modified boric acid excrement ammonia volatilization inhibitor as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a boric acid solution; adding ethylenediamine tetraacetic acid into the boric acid solution, and continuously stirring until a boric acid-organic ligand compound solution is generated; preparing a ferric sulfate solution; dropwise adding a ferric sulfate solution into the boric acid-organic ligand compound solution while stirring, heating and continuously stirring after dropwise adding, and cooling to room temperature to obtain a reaction mixture; and filtering or performing rotary evaporation on the reaction mixture to obtain a solid product, and washing and drying to obtain the ammonia volatilization blocking and controlling agent. The prepared ammonia volatilization inhibitor not only has the effects of inhibiting ammonia volatilization and further improving the retention rate of nitrogen in excrement, but also has the advantages that after boric acid is modified by iron-based coordination, the anti-interference capability of the material is improved, the influence of competitive adsorption or chemical reaction of other substances can be better resisted, and the effective inhibition on ammonia gas is ensured.