174results about How to "Reduce additional loss" patented technology

The invention relates to a dynamo using slot wedge using compound soft magnetic powder magnetic conductance material. The powder is the compound soft magnetic powder compounded from MnZn ferrite powder and reduced iron powder or carbonyl iron dust. The radio is 10-90wt% high resistivity magnetic powder, and 10-90wt% high magnetic permeability magnetic powder. Adding certain quantity glass fiber into compounded magnetic powder layer, separating structure would be formed. The invention could decrease supplementary load loss of dynamo, as well as eddy current loss, and improve efficiency of dynamo.

This invention relates to a control rod drive circuit of a nuclear power plant reactor characterizing that said drive circuit applies a double topological structure of an adjustable circuit loop parameter, the electronic switches S1, S2 of the upper and lower arms of the circuit are serial to a connection resistor R< x > and a RC-absorption protection circuit RCD, S1 and S2 are connected to the middle point and R< x >, the RCD is connected with a quick successive current diode D after connecting to the middle point then to a DC power Ud and the D is parallel to the R and L of the coil, in which, the coil supply device of the rod-control system has very good drive and following ability for the rising and falling of current, very small stress of electronic switch and additive loss to control circuit.

The invention discloses a control method for high-power reactive and harmonic dynamic hybrid compensation method. The hybrid compensation system comprises an SVG (static var generator), a TSF (thyristor switched filter) group and a controller, and the SVG and TSFs are parallelly connected to a grid. The three-phase current of the grid between the SVG and the TSFs is taken as a detection object, voltage and current values collected by sensors are processed through the controller, switching signals of the TSFs are acquired according to hybrid logic judgment, most of the reactive power of loads is compensated in a graded manner, and specific subharmonic is filtered out; control parameters of the SVG are acquired according to an instantaneous-power theory, and the surplus reactive power and harmonic of the loads are continuously compensated. A cost-effective scheme for rapid continuous compensation of the high-power reactive and harmonic is provided, impact of switching of passive equipment on the grid can be completely avoided, and harmonic current is avoided flowing to the grid, so that the control method is energy saving, emission reducing, green, environment friendly, good in social and economical effectiveness, wide in application range and especially applicable to the field of oil drilling.

The invention discloses a power collection and transmission system for a wind power plant. The system comprises an alternating current generatrix, a wind generating set, a rectifier station and an inverter station, wherein the rectifier station comprises a rectifier and a converter transformer; the direct current side of the rectifier is connected with the direct current side of the inverter station, and the alternating current side of the rectifier is connected with one side of the converter transformer through a converter inductor; and the other side of the converter transformer is connected with the alternating current generatrix, and is grounded through a capacitor. The invention also discloses a voltage control method for the alternating current generatrix of the system. The voltage comprising the amplitude and frequency of the voltage of the alternating current generatrix of the system is integrally controlled by two control dimensions of the rectifier on a wind power plant side, so that the stability of the alternating current voltage of the power collection and transmission system of the wind power plant is ensured, and harmonic components of an alternating current system of the wind power plant are reduced.

The invention discloses a low-loss large-effective area single mode fiber and a manufacturing method of the low-loss large-effective area single mode fiber, and relates to the field of optical fibers. The low-loss large-effective area single mode fiber comprises a quartz glass cladding, an internal coating and an external coating, wherein the quartz glass cladding, the internal coating and the external coating are arranged in sequence from inside to outside; the inside of the quartz glass cladding comprises a first fiber core area, a second fiber core area, a third fiber core area, a fourth fiber core area and a refractive index concave cladding, wherein the first fiber core area, the second fiber core area, the third fiber core area, the fourth fiber core area and the refractive index concave cladding are arranged in sequence from inside to outside; the refractive index concave cladding is subjected to deposition through a PCVD process; the quartz glass cladding is manufactured through an OVD process or a sleeving process. According to the low-loss large-effective area single mode fiber and the manufacturing method of the low-loss large-effective area single mode fiber, the scattering loss of the low-loss large-effective area single mode fiber and the additional loss of the low-loss large-effective area single mode fiber in a bent state can be reduced; due to the fact that the spire distribution of fiber core basic mode electromagnetic field power is adjusted into flattop distribution, optical power density is reduced, the effective area of the low-loss large-effective area single mode fiber is enlarged, the nonlinearity of the low-loss large-effective area single mode fiber is reduced, the incident power of an optical fiber communication system is increased by 0.4-2.6 dB, and the low-loss large-effective area single mode fiber is suitable for mass production.

Disclosed is an optical fiber cabin-penetrating sealing connection socket device used for a sealing cabin. The device comprises sealing flanges, optical fiber sealing seats, optical fibers, inner-side dockingplug cores and outer-side docking plug cores, the sealing flanges and the sealing cabin are sealed by adopting welding sealing or sealing rings, each sealing flange is provided with at least one optical fiber sealing seat mounting hole, the optical fiber seats are fixed in the mounting holes through laser welding sealing, the middle of each optical fiber is fixed in a central micropore of the corresponding optical fiber sealing seat through low-temperature glass welding material sealing, each of the inner-side and outer-side docking plug cores is fixed in the mounting holes at two ends of corresponding optical fiber sealing seat through interference fit, two ends of each optical fiber are bonded and fixed with the inner-side and outer-side docking plug cores respectively through epoxy glue, PC type or APC type docking faces are formed through fine grinding processing, and two ends of each sealing flange are connected with corresponding plugs in a matched manner respectively by adopting connection modes like thread connection or bayonet connection for optical signal transmission. The optical fiber cabin-penetrating sealing connection socket device used for the sealing cabin is compact in structure, effective in sealing, simple in method and low in cost, and optical signal transmission between inside and outside of the sealing cabin is effectively realized.

The invention relates to a mechatronic alternating current (ac) motor stator core of a compressor and a wire embedding method thereof and especially relates to an ac motor stator core of a piston refrigeration compressor used in a refrigerator. The motor stator core comprises an iron core body. A rotor aperture is arranged in a middle part of the iron core body. Wire embedding slots, which penetrate along an axial direction, are arranged along a circumferential direction of a hole wall of the rotor aperture. Inner sides of the wire embedding slots are provided with notches. A circumferential width (chord length) Bs0 of the notch is 0.1-1.0 mm. By using the stator core and the method of the invention, iron core surface losses and tooth pulse vibration losses can be reduced; an air gap coefficient is decreased; a field current is reduced; a power factor is raised so that working efficiency of the motor can be raised. Through redesigning a slot type size of the wire embedding slot, the additional losses generated by a harmonic field can be reduced so that the working efficiency of the motor can be further raised. A computer simulation experiment shows that the working efficiency of the motor can be increased by 1.5% by using the stator core of the invention. The stator core and the method is especially suitable for the single-phase asynchronous ac motor used in the totally enclosed refrigeration compressor.

The invention discloses a three-phase two-pulse-wave high-power pulse current power supply for electrolytic cells and a power supplying method. The three-phase two-pulse-wave high-power pulse current power supply for the electrolytic cells comprises a three-phase voltage regulation transformer, a three-phase induction filtering and rectifying transformer, a three-phase induction filter, a same-phase inverse-parallel-connection alternating current bus bar, single-phase rectifying cabinets, same-phase inverse-parallel-connection direct current bus bars and a unified controller. The three-phase voltage regulation transformer, the three-phase induction filtering and rectifying transformer and the same-phase inverse-parallel-connection alternating current bus bar are serially connected in sequence, output ends of the same-phase inverse-parallel-connection alternating current bus bar are respectively connected with input ends of the single-phase rectifying cabinets, output ends of the single-phase rectifying cabinets are connected with positive and negative electrodes of the electrolytic cells through the same-phase inverse-parallel-connection direct current bus bars, and the unified controller is connected with control ends of the single-phase rectifying cabinets. Two-pulse-wave high-power pulse current power source adjustable in duty ratio can be supplied to the electrolytic cells, thereby the electrolytic cells can be guaranteed in the most efficient electrolysis state and energy consumption of electrolysis is greatly reduced.

The coupling device of the present invention includes two pieces of proper fiber, fiber fixing block and fiber reinforcing block; spacer combination; LN waveguide chip; and package shell. The fiber with fiber fixing block and fiber reinforcing block is supported inside the package shell and has one end connected to side of the LN waveguide chip supported by spacer combination inside the shell andthe other end extending beyond the shell and as the input or output interface, with the joint to the shell being adhered. By means of improved coupling technology and structure, the light waveguide in the modulator is coupled with fiber precisely and reliably with high stability, low additional loss, low lkight reflection, and insertion loss not affected by temperature change and mechanical vibration.

The invention discloses a multi-section skewed pole rotor type permanent magnet wind-driven generator which comprises a stator and a rotor, wherein tile-shaped platy permanent magnet S poles and tile-shaped platy permanent magnet N poles are respectively embedded on the outer wall of the rotor. The concrete embedding and arranging processes are as follows: the transverse permanent magnet S poles and the transverse permanent magnet N poles are alternately arranged at intervals around the outer wall of the left section of the rotor, the permanent magnets with the same polarity are sequentially arranged along the axial direction of the rotor to form 3-18 sections, and the permanent magnets with the same polarity at the back section and the front section are in contact and are misaligned for an arc length of 0.1-1.0 permanent magnet along the rotation direction. A plurality of sections of permanent magnets which are arranged in a misaligned way form a rotor skewed pole structure. When rotating, the rotor is continuously and sequentially tangential with a magnetic line of the stator along the axial direction, and the moment of resistance in the starting stage is small, thus the rotor can rotate at lower wind speed to achieve the purpose of power generation. The fluctuation of the torque output by the rotor is small, thereby remarkably reducing the rotational vibration and the noiseof the wind-driven generator and improving the power generation quality simultaneously. The multi-section skewed pole rotor type permanent magnet wind-driven generator is suitable for being used as generators of different powers.

A main-frequency resonance type electric induction boiler is composed of the induction heater consisting of vertically arranged multiple induction heating tubes, a capacitor, an upper boiler cylinder or upper water collecting tank above said induction heating tubes, and a lower water collecting tank under said induction heating tubers. Said induction heating tube comprises a water tube, an internal heating steel tube and an external electromagnetic induction coil. When said induction heating tube is electrically and parallelly connected with said capacitor, a parallel resonance takes place to save electric energy by 50%.

The invention discloses an all-optical fiber broadband flat intermediate-infrared super-continuum spectrum light source. The light source is characterized in that the light source comprises a thulium-doped mode-locked fiber laser module used for generating ultra-short pulses, a thulium-doped fiber amplification module used for generating high-power and high-order soliton pulses, a 2-3 micron high-power SC spectrum generation module used for generating 2-3 micron high-power SC spectrum laser, a silica fiber and chalcogenide fiber efficiently-coupled and encapsulated module and a 2-5 micron intermediate-infrared broadband flat SC spectrum generation module for generating a 10dB-bandwidth coverage 2-5 micron intermediate-infrared band broadband flat SC spectrum, wherein the thulium-doped mode-locked fiber laser module, the thulium-doped fiber amplification module, the 2-3 micron high-power SC spectrum generation module, the silica fiber and chalcogenide fiber efficiently-coupled and encapsulated module and the 2-5 micron intermediate-infrared broadband flat SC spectrum generation module are arranged sequentially. According to the light source, quartz optical fiber tapering and lens optical fibers are used in a matched manner, so that efficient coupling of quartz optical fibers and chalcogenide optical fibers can be realized, and pumping efficiency can be improved, the high-quality full-optical fiber broadband flat intermediate-infrared SC (super-continuum spectrum) light source can be realized; since the light source is of a full-optical fiber structure, the intermediate-infrared SC spectrum light source has the advantages of low cost, high conversion efficiency, high-quality output beams and simple and compact structure.

The invention relates to a kind of copper belt H class insulation dry-type hollow self-cooled flat wave electric reactor that comprises loop, insulation pressed board, stick, it characterized in that the loop is single-cake type, the inner brace is set in the inner layer of loop, the lead which enwinds the inner brace is bare copper belt, H class insulation duct bar is set between every circle of loop, H class insulation cushion block is set between nearby cakes, the loop is clamped by up and down insulation pressed board, and the H class insulation brace bar is set outside the loop, said inner and outer insulation brace bar, insulation duct bar, insulation cushion block adopts H class insulation material. The advantages are following: the structure is simple and reasonable, the electric property is good, the mechanical robustness is high, and radiation property is good, the temperature rise of loop is low, the volume is small, weight is light, the noise is low.

The invention discloses a high-resistance surface metamaterial waveguide slot antenna. The metamaterial waveguide slot antenna comprises a metamaterial waveguide tube and a radiation gap, wherein the metamaterial waveguide tube comprises a metal waveguide tube and a dielectric plate, the metal waveguide tube is a through tube with a rectangular cross section, the radiation gap is arranged in an upper surface of the metal waveguide tube, one end of the metal waveguide tube is opened and is used as a signal input port, the other end of the metal waveguide tube is closed and is in a short-circuit state, the dielectric plate is arranged on a wide edge of a lower part of an inner wall of the metal waveguide tube along a length direction, a periodic pattern is etched on a surface of the dielectric plate. By the antenna, low-loss radiation can be achieved in a working frequency band, and the antenna is high in efficiency; and by the antenna, dual-band suppression outside the working frequency band can be achieved, the characteristic of the antenna is equivalent to that of a high-pass filter when electromagnetic interference of a low frequency band is suppressed, and the characteristic of the antenna is equivalent to that of a band rejection filter when electromagnetic interference of a high frequency band is suppressed.

The present invention discloses an integrated gate commutated thyristor. The said gate commutated thyristor includes n-type substrate, p-type doped region, n-type doped region, anodic p+ doped region of the gate commutated thyristor, diode n+ buffer region, and cathode paling of gate commutated thyristor, and also includes cathode and gate of the gate commutated thyristor, anode of the diode, anode of the gate commutated thyristor and cathode of the diode. The present invention has characters: n+-type isolating ring is set between the p-type doped regions of the gate of the gate commutated thyristor and the anode of the diode. The integrated gate commutated thyristor and its processing method can achieve effectively isolation between GCT element and the diode.

The invention relates to a seven-core small-diameter single mode fiber. The seven-core small-diameter single mode fiber comprises seven single-mode fibers having the same core cladding structure, wherein the seven fibers combined together closely, one fiber located at the center of the fibers, and the other six fibers surround the periphery of the center fiber; the single-mode fiber comprises a core layer and a cladding layer, the cladding layer comprises an inner cladding layer, a sunken cladding layer and an external cladding layer from the inside to the outside, radius r4 of the external cladding layer is 20-25 microns, ratio r4/r1 of the radius of the external cladding layer to the radius of the core layer is 5.1-5.5, ratio r4/r2 of the radius of the external cladding layer to the radius of the inner cladding layer is 2.4-2.8, and ratio r4/r3 of the radius of the external cladding layer to the radius of the sunken cladding layer is 1.6-2.0. With the fiber provided by the invention,external diameter of the multi-core fiber is reduced greatly, and communication capacity density of unit cross section of the fiber is improved remarkably; consequently, space resource for paving pipelines is reduced; meanwhile, signal crosstalk influence among different fiber units is eliminated. The fiber provided by the invention has excellent comprehensive performance parameters, such as wavelength, mode field, attenuation and chromatic dispersion, in application wavebands, has microbending loss which is small enough. The fiber provided by the invention can be produced through a simple and convenient manufacturing method and needs low manufacturing cost.

The invention discloses a mine earthquake monitoring method based on fiber gratings. At least thirty coal sample test blocks are randomly selected from underground to-be-monitored area coal bodies, and change conditions of resonance wavelengths of the fiber gratings are obtained; multiple monitoring points are selected around the to-be-monitored area coal bodies to enable the monitoring points to surround a to-be-monitored area, multiple fiber grating sensors transmit real-time fiber grating resonance wavelength signals to an underground monitoring sub station through multi-core communication cables; the underground monitoring sub station transfers optical signals to a ground receiver; the change conditions of the resonance wavelengths of the fiber gratings of each monitoring point are obtained from the processed signals through a data processing computer; and a real-time comparison between change of the resonance wavelengths of the fiber gratings, monitored in real time and change rules of the resonance wavelengths of the fiber gratings, obtained through tests until comparison consistency occurs, and it is indicated that the coal bodies have the risk of mine earthquakes. The method provided by the invention is high in accuracy and good in real-time performance.

The invention relates to the field of motors and discloses a compressor and a permanent magnet motor thereof. The permanent magnet motor comprises a stator and a rotor, wherein the stator comprises a stator core and a stator winding; the stator core comprises multiple stator teeth, stator slots and a rotor containing part; the stator teeth are distributed in the peripheral direction of the stator at intervals; each stator slot is formed between two adjacent stator teeth; the rotor containing part is defined by inner end edges of the multiple stator teeth; the stator winding is arranged in the stator slots; the rotor can be rotationally arranged in the rotor containing part relative to the stator; the rotor comprises a rotor core; multiple magnet slots are formed in the rotor core in the peripheral direction at intervals; the rotor further comprises multiple magnetic parts which are respectively arranged in the multiple magnet slots; the distance between the rotation center of the rotor and an outer edge of the rotor containing part is Ris; the distance between the rotation center of the rotor and an outer edge of the rotor core is Ror; Ris-Ror is greater than or equal to 0.9 mm and less than or equal to 2.2 mm.

The invention discloses a method for splicing a photonic crystal fiber and a single-mode fiber. The method includes the steps that light curing adhesives permeate into the first end of the photonic crystal fiber, ultraviolet light is coupled into a fiber core of the photonic crystal fiber from the second end of the photonic crystal fiber, and the light curing adhesives at the portion, around the fiber core, in the first end of the photonic crystal fiber are cured to fill air holes of the photonic crystal fiber; the uncured light curing adhesives in the first end are removed, and the second end of the photonic crystal fiber is sealed; air pressure is applied to the first end of the photonic crystal fiber to allow the air pressure of air holes which are not filled to be higher than barometric pressure, the first end of the photonic crystal fiber is subjected to discharging heating to be at 1,400 DEG C to 1,900 DEG C, and the air holes which are not filled in the first end are collapsed and sealed; the first end of the photonic crystal fiber and the single-mode fiber are spliced. According to the method, the air holes in the photonic crystal fiber are subjected to selective area filling through the light curing materials in cooperation with the ultraviolet light, and therefore the technical problems that in the prior art, filling efficiency is low, and filling is uneven are solved.