54results about How to "Reduce nonlinear effects" patented technology

The invention relates to the technical field of optical fibers, in particular to a rare-earth-doped anti-resonance hollow-core optical fiber. The rare-earth-doped anti-resonance hollow-core optical fiber comprises a cladding and a plurality of anti-resonance tubes, and the cladding comprises a first refraction tube and a rare-earth-doped tube arranged on the first refraction tube in a sleeving mode; the anti-resonance tubes are sequentially arranged on the inner wall of the first refraction tube at intervals, a fiber core area is defined by the anti-resonance tubes jointly, and the fiber core area is used for transmitting laser; the rare earth doped tube is used for amplifying laser, and the first refraction tube is used for coupling the amplified laser into the fiber core area. According to the rare earth-doped anti-resonance hollow-core optical fiber provided by the invention, laser gain can be realized, and the possibility of mode instability in a laser transmission process is reduced.

The invention discloses a composite hollow-core optical fiber and application thereof in detection of hydrocarbon gas, and belongs to the technical field of optical fibers. The composite hollow-core optical fiber sequentially comprises an outer cladding layer, an inner cladding layer and a fiber core from outside to inside. The inner cladding is an anti-resonance area and comprises four anti-resonance units which are uniformly distributed in the circumferential direction, and each anti-resonance unit comprises three layers of circular micro capillary tubes which are coaxially nested in sequence from inside to outside; the outer cladding is a photonic band gap region, comprises a plurality of air holes which are tangent to one another, and is of a hexagonal structure as a whole; the fiber core is filled with air and is formed by encircling a plurality of anti-resonance units in the inner cladding. The composite hollow-core optical fiber has the characteristics of a hollow-core photonic band gap optical fiber and a hollow-core anti-resonance optical fiber, a three-layer circular micro capillary structure is adopted, light can be effectively limited in a fiber core, and transmission loss is reduced; and the composite hollow-core optical fiber can work under the ultra-wide wavelength condition of 5.5-9.5 [mu] m, so that the requirement for detecting toxic hydrocarbon gas is met.

The present invention relates to the technical field of optical fiber devices, and proposes a hollow-core fiber power combiner, including an optical fiber bundle and a hollow-core optical fiber, wherein the optical fiber bundle is formed by taper-forming n solid-core optical fibers; the input end of the optical fiber bundle is the large end of the optical fiber bundle, and the output end of the optical fiber bundle is the small end of the optical fiber bundle, wherein one of the n solid-core optical fibers in the optical fiber bundle is located at the center as the central optical fiber, and the remaining n-1 optical fibers are distributed around the center optical fiber; the hollow-core optical fiber is a nested anti-resonant hollow-core optical fiber, which includes an outer cladding, a nested ring and a hollow-core region from the inside to the outside, and n-1 nested rings are distributed around the periphery of the hollow-core region; the laser of the input optical fiber bundle is input into the hollow-core optical fiber through the small end of the optical fiber bundle, and the long-distance transmission of the laser is realized by using the hollow-core optical fiber. The present invention has a simple and compact structure, high coupling efficiency, can better maintain the purity of the beam mode, and has great application value and potential advantages for high-power long-distance transmission of optical fiber lasers.

The invention relates to the technical field of coherent optical communication, in particular to a Dither signal generation and feedback acquisition circuit and method and a coherent optical module, and the circuit comprises an MCU and a DAC chip. The MCU comprises a disturbance generator, an SPI (Serial Peripheral Interface), an on-chip ADC (Analog to Digital Converter), an automatic bias controller and two DMA channels; the first DMA channel, the SPI interface and the DAC chip are connected in sequence, the disturbance generator is connected with the SPI interface, and the DAC chip is connected to a laser and used for sending Dither signals to the laser; the on-chip ADC is connected with the second DMA channel and the laser and used for collecting feedback signals under driving of the second DMA channel, and the on-chip ADC is sequentially connected with the automatic bias controller and the disturbance generator and used for sending optimized and adjusted Dither signal parameters to the disturbance generator. The running efficiency of the MCU can be improved, and the internal resource utilization rate of the MCU is also improved.

The invention discloses a continuous optical fiber laser, and relates to the technical field of lasers, the continuous optical fiber laser comprises an output device, a first stripper, a first beam combiner, a composite resonant cavity, a second beam combiner and a second stripper which are sequentially connected through a central fiber, the composite resonant cavity is internally provided with a plurality of sub-cavities, and the sub-cavities are used for filtering and enhancing laser beams; the continuous fiber laser further comprises a plurality of first pumping sources and a plurality of second pumping sources, wherein the plurality of first pumping sources are respectively connected with the first beam combiner; and the plurality of second pumping sources are respectively connected with the second beam combiner. According to the technical scheme, the overall structure is simple, and low-cost and high-efficiency suppression of the nonlinear effect is achieved only through cooperation of the output device, the stripper and the beam combiner.

The invention relates to the technical field of optical fiber devices, and provides a hollow-core optical fiber power beam combiner, which comprises an optical fiber bundle and a hollow-core optical fiber, and is characterized in that the optical fiber bundle is formed by tapering and bunching n solid-core optical fibers; the input end of the optical fiber bundle is an optical fiber bundle large-head end, the output end of the optical fiber bundle is an optical fiber bundle small-head end, one of n solid optical fibers in the optical fiber bundle is located in the center and serves as a central optical fiber, and the rest n-1 optical fibers are distributed around the central optical fiber in a center surrounding mode; the hollow-core optical fiber is a nested anti-resonance hollow-core optical fiber and sequentially comprises an outer cladding layer, nested rings and a hollow-core area from inside to outside, and n-1 nested rings are distributed around the periphery of the hollow-core area; laser of the input optical fiber bundle is input into the hollow-core optical fiber through the small end of the optical fiber bundle, and long-distance transmission of the laser is achieved through the hollow-core optical fiber. The device is simple and compact in structure and high in coupling efficiency, can well maintain the mode purity of the light beam, and has great application value and potential advantages for high-power long-distance transmission of the fiber laser.

The invention relates to the technical field of precision reducer testing, and discloses an angle measurement error suppression system and method in a precision reducer dynamic test, and the system comprises a servo motor closed-loop regulation and control module, a measurement shafting motion state monitoring module, a piezoelectric ceramic driver regulation and control module, and a combined control module. The method comprises the steps that first-step regulation and control are conducted through the servo motor closed-loop regulation and control module, second-step regulation and control are conducted through the piezoelectric ceramic driver regulation and control module, and according to the running states, monitored in real time, of the high-speed-end motor and the low-speed-end motor and the motion state, monitored in real time, of the measuring shaft system, and in combination with a preset standard, the high-speed-end motor and the low-speed- The control proportion of the closed-loop regulation and control module of the servo motor and the piezoelectric ceramic driver regulation and control module is dynamically adjusted, so that the dynamic angle measurement error is kept within the preset range, and the angle measurement error caused by the dynamic change of the system structure in the speed reducer testing process can be effectively reduced.

A laser transmission optical cable based on a hollow-core anti-resonance optical fiber is suitable for flexible transmission of ultrafast laser, and comprises an input laser beam, and a first optical window, a first air chamber, a first water chamber, a hollow-core capillary optical fiber, a hollow-core anti-resonance optical fiber, a second water chamber, a second air chamber and a second optical window which are sequentially arranged along the beam transmission direction, the hollow-core capillary optical fiber and the hollow-core anti-resonance optical fiber are glued to form a nested structure, and the ratio of the diameter of a cladding capillary of the hollow-core anti-resonance optical fiber to the diameter of a fiber core of the hollow-core anti-resonance optical fiber is 0.63-0.68. The hollow-core anti-resonance optical fiber has high single-mode purity, the problem that a laser mode is coupled to a high-order mode due to mechanical disturbance such as optical fiber bending and twisting can be solved, the hollow-core anti-resonance optical fiber has higher adaptability in a complex processing environment, the laser processing efficiency and stability are improved, and the optical fiber is suitable for large-scale production. And meanwhile, the influence of a heat effect under high power and a nonlinear effect caused by air in an ultrafast laser transmission process are considered.

The invention discloses a composite hollow-core optical fiber applied to two-photon microscopic imaging, and relates to the technical field of optical fiber communication. The optical fiber sequentially comprises a fiber core area, an inner cladding layer and an outer cladding layer from outside to inside in the radial direction of the optical fiber, an air hole assembly is installed in the outer cladding layer, and a plurality of ginkgo leaf-shaped cladding pipes are installed in the inner cladding layer. The structure of the ginkgo leaf-shaped cladding tube is adopted, a large fiber core can be reserved to the maximum extent, light leakage is effectively prevented, low loss of a base film in the light transmission process is guaranteed under the condition that the wavelength of the near-infrared band ranges from 0.8 micrometer to 1.08 micrometers, the loss is smaller than 0.001 dB / km, dispersion is quite flat and close to 0, the nonlinear effect is lower than 0.12, and the optical fiber has the advantages of being high in optical fiber transmission efficiency, good in optical fiber transmission performance and the like. And the area of a mode field is basically greater than 1000 microns < 2 >, so that the requirements of high resolution, large view field and deep tissue penetration in the field of biomedical imaging can be met.

The present invention discloses a feedback analog-to-digital converter based on an LC voltage-controlled oscillator and an implementation method thereof, which are corresponding schemes. In the scheme: an LC voltage-controlled oscillator is used to sense a voltage signal (difference result) and convert it into a time domain signal (oscillation signal), thereby realizing quantitative measurement of the signal in the time domain; the scheme method uses a delay chain to realize high-speed sampling and high-precision quantization of the LC voltage-controlled oscillator signal, and through a feedback loop, the influence of the voltage-frequency conversion nonlinearity of the LC voltage-controlled oscillator on the accuracy of analog-to-digital conversion can be suppressed, thereby improving the linearity of the system; the structure of the entire scheme has the characteristics of low power consumption, simple structure, noise shaping, and self-contained phase quantization dynamic element matching, and can accurately measure the signal. Compared with the analog-to-digital converter realized by an oscillating ring voltage-controlled oscillator, the present invention has better phase noise.

The invention relates to a bending-resistant all-solid-state microstructure optical fiber. The bending-resistant all-solid-state microstructure optical fiber comprises a fiber core region and an inner cladding, the fiber core area comprises a first filling round hole, a first annular fiber core and a first groove ring; the first filling circular hole is located in the center of the fiber core area and has a first refractive index. The first annular fiber core wraps the first filling round hole and has a second refractive index; the first groove ring wraps the first annular fiber core and has a third refractive index; the inner cladding wraps the fiber core area and has a fourth refractive index; a plurality of second filling circular holes are distributed in the inner cladding, and the second filling circular holes have a fifth refractive index; the first refractive index is higher than the second refractive index; the second refractive index is higher than the fourth refractive index; the fourth refractive index is higher than the third refractive index; the third refractive index is higher than the fifth refractive index. According to the invention, the technical problem of poor bending resistance on the premise of large-mode-field transmission in the prior art can be solved.

The present application discloses a fiber laser pulse train generation module and a fiber laser, which firstly adjusts the repetition frequency of the optical pulse signal emitted by the fiber laser seed source to a preset repetition frequency through a pulse selector, and then, through a pulse train generator, multi-stage splits the optical pulse signal to generate a pulse train with multiple sub-pulses, thereby reducing the energy of a single pulse, thereby reducing the nonlinear effect of the optical fiber and improving the transmission performance of the fiber laser beam. In addition, especially when the seed source repetition frequency is low and the number of sub-pulses in the pulse train is small, the pulse train generation is more convenient and effective because the repetition frequency needs to be reduced first and the number of sub-pulses is multiplied.

The present disclosure belongs to the field of signal processing technology, and provides a weak current signal filtering method, system, electronic device and storage medium, the method comprising: dividing the noise into environmental noise, system noise and random noise according to the source of the noise; constructing a system noise model and an environmental noise model according to the environmental noise and the system noise; performing parameter compensation on the environmental noise and the system noise according to the system noise model and the environmental noise model to obtain a compensation value containing the random noise; filtering the random noise in the compensation value to obtain a filtering value of the current transmission signal. The step of selecting the filtering algorithm is removed, and different noise models are constructed according to different noise environments to adapt to different noise environments, thereby improving the filtering effect of the noise.

A few-mode fiber Bragg grating and a fiber oscillator capable of filtering out high-order modes, wherein the few-mode fiber Bragg grating comprises a high-reflection grating and a low-reflection grating, both of which are made by tapering a large-core double-clad energy transfer fiber; the high-reflection grating and the low-reflection grating both comprise an input double-clad fiber containing a coating layer, an input fiber after stripping the coating layer, an input taper region, a waist region, an output taper region, an output fiber after stripping the coating layer, and an output double-clad fiber containing a coating layer, wherein the waist region, the output taper region, and the output fiber after stripping the coating layer constitute a grating writing region; and the fiber oscillator comprises a high-reflection grating, a forward pump source, a forward pump / signal combiner, a gain fiber, a backward pump / signal combiner, a backward pump source, a low-reflection grating, a fiber end cap, and a laser output end of a laser.

The application discloses an oil film damper damping structure, which comprises a bearing, a support seat and an adjusting structure, wherein the bearing comprises a bearing outer ring and a bearing inner ring, the bearing inner ring is suitable for being connected with a rotor; the inner ring of the support seat is coaxially arranged with the bearing outer ring to enclose an oil film cavity suitable for containing lubricating oil; the adjusting structure is fixedly arranged in the oil film cavity, and the adjusting structure is fixed on the bearing outer ring or the inner ring of the support seat; the adjusting structure comprises a flow control part, the flow control part comprises a streamlined surface and a flow resistance plane which are connected with each other, and the streamlined surface and the flow resistance plane are used for controlling the flow speed of the lubricating oil; the friction coefficient of the flow resistance plane is greater than that of the streamlined surface. The structure plays a damping role under the action of the friction resistance and the pressure difference resistance of the lubricating oil on the adjusting structure, the control effect of the oil film extrusion flow is strengthened, and the use and application range of the extrusion oil film damper are increased.

The invention relates to an ultra-large mode field spoke core fiber laser suitable for laser micro propulsion, which adopts a main oscillation power amplification structure and comprises a seed source, a first amplification stage, a second amplification stage and a main amplification stage, the seed source is a directly modulated semiconductor laser, outputs pulse laser with tunable pulse width and repetition frequency, and the laser of the seed source enters the main amplification light path in a free space coupling mode after being subjected to primary and secondary pre-amplification. The main amplification stage amplifies the average power of laser to hectowatt magnitude by adopting an ultra-large mode field spoke core optical fiber with a bilateral pumping design, and dynamic adjustment of specific impulse and thrust of the micro-thruster is realized by changing the power, pulse width and frequency of the laser. The laser micro-thruster is clear in design principle, the achievable effect of the laser micro-thruster breaks through the limitation of the specific impulse and thrust dynamic range of a common laser micro-thruster, and the multi-task scene application capacity of the laser micro-thruster is remarkably improved.

The invention discloses a high-absorption large-mode-field ytterbium-doped multi-clad optical fiber, and relates to the technical field of optical fibers. The optical fiber comprises a doped core layer, a doped buffer layer, an inner cladding layer, a quartz cladding layer, an organic coating cladding layer and a protective layer which are sequentially arranged from inside to outside in a coating manner, ytterbium ions are doped in the doped core layer, and any one element of cerium and phosphorus is doped in the doped core layer. Ytterbium ions are doped in the doped buffer layer, and any one of cerium and phosphorus is doped in the doped buffer layer. According to the ytterbium ion doped fiber, a certain ytterbium ion doping concentration level can be guaranteed, cladding pumping absorption of the fiber core can be improved, the use length of the fiber can be effectively reduced, and the nonlinear effect of the fiber is reduced.

The invention belongs to the technical field of fiber lasers, and discloses a cladding fiber grating which comprises a cladding area and a fiber core area, and the cladding area is inscribed to form a cladding grating of a periodic structure. The cladding fiber bragg grating is adopted, residual pump light which is not absorbed in the fiber laser is reflected back to the gain fiber to be absorbed again, the length of the gain fiber in the fiber laser can be shortened to 30%-50% of the length of the gain fiber in a traditional scheme, and the cost of the fiber laser is reduced; meanwhile, the gain optical fiber with the short length can effectively reduce accumulation of the nonlinear effect, and laser output with higher power can be achieved.

The invention relates to the technical field of optical communication, in particular to a silicon optical chip, an external cavity laser and a method for restraining a micro-ring nonlinear effect. The P-doped region and the N-doped region at the two sides of the micro-ring resonant waveguide are respectively connected with the ground and an input voltage through an electrical connection module, so that a transverse electric field is formed in the micro-ring resonant waveguide, and free carriers generated after light passes through the micro-ring resonant waveguide are removed through the transverse electric field; and on the other hand, the P-doped region and the N-doped region are respectively connected with an external input voltage and the ground through the electrical connection module, so that bias voltage control on the two sides of the micro-ring resonant waveguide can be realized on the basis of not increasing redundant pins, free carriers generated in the micro-ring resonant cavity are eliminated, and the reliability of the micro-ring resonant cavity is improved. Therefore, the nonlinear effect of the micro-ring resonant cavity is effectively suppressed, and the micro-ring resonant cavity has the advantages of being simple in structure and meeting the miniaturization requirement.

The present application discloses a speaker localization method for a conference device, the device comprising a first microphone array, a second microphone array, a third microphone array and at least one speaker. In addition, a speech processing method is disclosed. Among them, when the local conference device plays the voice of the speaker at the remote venue, the speaker localization method performs speaker localization according to the signal collected by the microphone far from the speaker to avoid being affected by the sound emitted by the speaker; therefore, the accuracy of speaker localization can be effectively improved. When no one is speaking at the remote venue, the speaker localization is performed according to the signals collected by all microphones; therefore, the robustness and accuracy of speaker localization can be effectively improved.

The embodiment of the invention provides an elastic wave device and an electronic product. The elastic wave device comprises a piezoelectric layer; the IDT electrode layer is arranged on the piezoelectric layer, the IDT electrode layer comprises a first bus bar and a second bus bar which are oppositely arranged along a first direction, and a part between the first bus bar and the second bus bar is defined as an interdigital region; the electrode fingers are arranged in the interdigital area, the electrode fingers comprise a plurality of first electrode fingers and a plurality of second electrode fingers which are arranged at intervals in the second direction, first intervals are formed between the first electrode fingers and the second bus bars, and first intervals are formed between the second electrode fingers and the first bus bars; the interdigital area comprises a central area and additional film areas, the two edges of the central area in the first direction do not exceed the edges of the sides, away from the bus bar, of the first electrode fingers and the second electrode fingers, and the additional film areas are arranged on the two sides of the central area; and the additional film is arranged on the piezoelectric substrate, the additional film is arranged in the additional film area, and the material of the additional film is silicon dioxide, silicon oxide, silicon nitride, HfO2, silicon, resin, PI or titanium oxide.

The invention discloses a test vibration platform which is characterized in that a plurality of groups of vibration mechanisms are arranged between a base and a test objective table in a regular annular array, and the mounting position can be flexibly adjusted according to the size of a test piece by arranging a mounting mechanism, so that vibration test requirements of different structures are met; according to the test vibration platform, the air cylinder is adopted as a main driving part of the vibration mechanism, so that the thrust and the bearing capacity of the vibration platform can be flexibly adjusted according to the weight and the vibration amplitude of a test piece, and therefore the vibration test requirements of a heavy structure are met; the working frequency range of the vibration table can be flexibly adjusted according to the vibration characteristics of a test piece so as to adapt to the high-frequency or low-frequency vibration test requirements, and the waveform distortion and the nonlinear effect of the vibration table can be effectively inhibited through the matching of the locking bolt and the locking hole, so that the precision and the credibility of the vibration test are improved.

The present invention discloses a linearized PGC demodulation signal processing method based on hybrid phase modulation. On the basis of sinusoidal phase modulation, triangular phase modulation is introduced to perform hybrid modulation on the laser phase modulation interferometer to obtain interference signals, which are then mixed with the carrier signal and its second-order harmonic signal to obtain a pair of phase quadrature signals; synchronous differential cross-multiplication and inverse tangent processing are performed on the quadrature signals to obtain phase signals that change with triangular phase modulation, and the demodulation phase is linearly corrected in real time using the obtained demodulation π integer phase without nonlinear error and the corresponding demodulation phase, and the demodulation nonlinear error is directly corrected by combining the π integer phase and the corrected demodulation phase. The present invention eliminates the influence of periodic nonlinear errors caused by phase modulation depth drift and carrier phase delay through linearized phase demodulation, and realizes high-precision phase demodulation.

The invention provides a multiplexer and communication equipment, and relates to the technical field of filtering. The multiplexer at least comprises a sending channel, a receiving channel and a common end, and the receiving channel and the sending channel share the common end so as to send or receive a transmission signal through the common end; the sending channel comprises a plurality of series resonance units and parallel resonance units, the parallel resonance units are sequentially arranged on connection points of the series resonance units and the grounding end, and the series resonance units and / or the parallel resonance units comprise target resonance units closest to the common end; wherein the target resonance unit comprises a plurality of parallel branches, each parallel branch comprises at least one resonator, and the resonators on each parallel branch are arranged in a cascading manner, so that the phase difference current is generated through each parallel branch, the generated high-order signals have the phase difference, vector superposition is carried out during final output, and the high-order signals are obtained. Therefore, the intermodulation signal is weakened to a certain extent, the signal quality is improved, and the method has high applicability.

This invention discloses a graded-index non-zero dispersion-shifted optical fiber based on orbital angular momentum modes, comprising an optical fiber body including a ring core and an optical fiber cladding surrounding the ring core. The optical fiber cladding includes a circular region inside the ring core and an outer optical fiber cladding outside the ring core. This invention aims to provide a feasible optical fiber structure for suppressing four-wave mixing to meet the requirements of low-dispersion transmission of multiple orbital angular momentum modes.

This invention discloses a submarine cable acoustic monitoring system based on scattering-type fiber optic fingerprint technology, belonging to the field of fiber optic sensing technology. The system includes a light source module, a transmitting module, a submarine cable fiber optic sensing unit, a dual-balanced detector module, and a signal processing module. In the light source module, the continuous light output from the laser is split into a probe light and a local reference light by a dynamic beam splitter. The probe light is modulated and injected into the submarine cable fiber, and the resulting backscattered Rayleigh light carries acoustic information back. The dual-balanced detector module has a built-in light intensity monitoring unit that monitors the light intensity of the reference light and the scattered light in real time. By comparing the two intensities, it sends a feedback control signal to the dynamic beam splitter, dynamically adjusting the splitting ratio to maximize the interference term intensity coefficient, thereby improving the signal amplitude and sensing sensitivity. This invention solves the problems of limited sensing distance and high laser linewidth requirements in traditional systems, and is suitable for long-distance, high-reliability submarine cable acoustic event monitoring and location in deep-sea environments.

The utility model discloses a kind of annular light beam laser beam combiner based on spindling annular optical fiber, annular light beam laser beam combiner uses (N+1)*1 combiner, the input end of annular light beam laser beam combiner includes a center optical fiber and N root side fiber, and the output fiber of annular light beam laser beam combiner is 1 spindling annular optical fiber.

The present invention discloses a high-precision MOEMS relative gravimeter based on a self-traceable grating, which belongs to the field of detection instruments, and includes a MEMS resonator, a self-traceable grating interferometer and a data processing module, wherein the MEMS resonator includes a folding beam, a fixed frame and a mass block, wherein both ends of the folding beam are connected to the inner side wall of the fixed frame, and the mass block is suspended in the center of the fixed frame through the support of the folding beam, and the self-traceable grating interferometer includes a self-traceable grating and an interference measurement reading head, and the self-traceable grating is arranged on the mass block. The present invention adopts the above-mentioned high-precision MOEMS relative gravimeter based on a self-traceable grating, which has extremely high measurement accuracy, and the displacement measurement can be traced in real time. Compared with the traditional MOMES relative gravimeter, it can improve the accuracy of its displacement measurement and reduce the nonlinear effect of gravity acceleration measurement.

The utility model relates to an ultralow-loss single-mode optical fiber and an optical fiber product. The effective area lambda eff of the ultra-low-loss single-mode fiber is 130 microns < 2 >, and the ultra-low-loss single-mode fiber comprises a core layer, an inner cladding layer and an outer cladding layer. The inner wrapping layer wraps the periphery of the core layer and comprises a first wrapping layer and a second wrapping layer which are concentrically arranged in sequence from inside to outside in the radial direction; the outer cladding layer is coated outside the inner cladding layer and comprises a third cladding layer and a fourth cladding layer which are concentrically arranged in sequence from inside to outside along the radial direction; the single-mode optical fiber has a large mode field diameter and an effective area, and is good in transmission performance; the optical fiber is small in transmission loss and attenuation, is not sensitive to bending, can keep a low nonlinear effect while obtaining a high optical signal-to-noise ratio, is easy to produce, and is suitable for an optical fiber communication system with higher speed and higher capacity.

The present invention relates to the field of permanent magnet synchronous motor current control, and specifically to a permanent magnet synchronous motor current loop control method and device based on cascade sliding mode resonance. The method and device first construct a permanent magnet synchronous motor mathematical model, and the nonlinear influence of the inverter is taken into account during the construction of the permanent magnet synchronous motor mathematical model; then construct a cascade sliding mode resonance controller, and the cascade sliding mode resonance controller designs a super spiral sliding mode control law based on high-order sliding mode theory during the construction; finally, a fixed time adaptive estimation law is designed in the cascade sliding mode resonance controller to estimate unknown disturbances, and a cascade sliding mode resonance control structure combining a super spiral controller and a resonance controller is formed to achieve the purpose of suppressing current loop harmonics and ensuring good robustness of the control system, realize the rapidity and robustness of the current loop response, and reduce the distortion of the output current of the permanent magnet synchronous motor, and effectively improve the control accuracy under the condition of motor system parameter changes.