1418 results about "Synchronous motor" patented technology

The invention provides a parameter self-tuning control method for a permanent magnet synchronous motor, and relates to the technical field of synchronous motor control, and the method comprises the steps: firstly, monitoring a dynamic operation data set, including stator current, rotor flux linkage, rotating speed fluctuation quantity and load change characteristic parameters, of the permanent magnet synchronous motor in real time; secondly, feature relevance mapping is carried out based on multiple parameter combinations in the dynamic operation data set, initial parameter adjustment sets are generated, and each initial parameter adjustment combination comprises the mapping relation between the motor operation state and the target response index; dividing a plurality of parameter adjustment subsets according to the parameter correlation degree, configuring a dynamic error range, extracting a positive adjustment parameter from the first subset corresponding to the first operation state, and extracting a negative adjustment parameter from the second subset with the low correlation degree; and finally, training a dynamic parameter adjustment model by utilizing the positive adjustment parameters and the negative adjustment parameters, generating an optimized real-time parameter setting instruction set, realizing intelligent self-setting of the parameters of the permanent magnet synchronous motor, and improving the running performance of the motor.

The invention provides a permanent magnet synchronous motor and an inverter compressor, and relates to the technical field of compressor design and manufacturing, the permanent magnet synchronous motor comprises a stator core and a rotor core arranged in the stator core; the stator core comprises stator teeth which are uniformly distributed in the circumferential direction, a stator yoke is arranged between every two adjacent stator teeth, every two adjacent stator teeth and the stator yoke between every two stator teeth form a stator groove, and a winding is embedded in each stator groove; a plurality of uniformly distributed eccentric arcs and linear segments are arranged on the periphery of the outer edge of the rotor core in the circumferential direction, uniformly distributed magnetic steel jacks are formed in the rotor core, and a groove is formed between every two adjacent magnetic steel jacks; and permanent magnets with alternating NS poles are arranged in the magnetic steel jacks. The inner diameter Rsi of the stator iron core, the maximum outer diameter Rro of the rotor iron core and the axial length Les of the stator iron core are limited to meet the condition that Les / (Rsi + Rro) is larger than or equal to 0.455 and smaller than or equal to 1.264, the torque density of the synchronous motor can be increased, and cost is reduced.

The invention relates to a deep integrated electric drive assembly design method and system, and the method comprises the steps: obtaining the parametric modeling data of an electric drive assembly, and carrying out the digital twin synchronous motor modeling, and obtaining a drive three-dimensional model; topological structure data of the electric drive assembly are obtained, and mixed algorithm optimization calculation is carried out on the topological structure data and the drive three-dimensional model to obtain a system optimization solution set; performing model prediction control construction based on the system optimization solution set, and performing gear contour line modification processing on the electric drive assembly to obtain a speed reduction transmission strategy; performing heat dissipation management extraction optimization on the system optimization solution set according to a preset variable cross-section micro-channel heat dissipation algorithm to obtain a dynamic heat dissipation strategy; preliminarily integrating the speed reduction transmission strategy and the dynamic heat dissipation strategy to obtain an initial design scheme; eMI filtering optimization is carried out on the initial design scheme, multi-stage electromagnetic shielding construction is carried out, and a system performance optimization scheme is obtained. The comprehensive performance of the system can be improved through integral design, regulation and control.

The invention relates to the technical field of motor control, and discloses a hybrid excitation synchronous motor control strategy optimization method and device. The method comprises the following steps: performing mathematical modeling on permanent magnet flux linkage, exciting current and rotor parameters of the hybrid excitation synchronous motor to obtain a state observer equation; collecting current parameters and position parameters, and performing filtering processing to obtain motor operation state parameters; inputting a five-layer deep neural network for current and rotating speed parameter prediction to obtain an optimal current parameter and an optimal rotating speed prediction parameter; constructing a multi-objective function, and solving to obtain a current reference value; inputting the current reference value into a cascade PI controller, and performing voltage regulation through feedforward decoupling control and a space vector pulse width modulation technology to obtain a control voltage signal; and performing performance calculation control parameter optimization on the control voltage signal to obtain a target control parameter, thereby improving the control precision of the hybrid excitation synchronous motor.

The invention relates to the technical field of natural gas treatment, and particularly discloses a turbine and motor double-drive magnetic levitation natural gas expansion recompression unit, system and method, and the turbine and motor double-drive magnetic levitation natural gas expansion recompression unit comprises a natural gas expansion machine, a high-speed synchronous motor and a natural gas compressor which are coaxially and rigidly connected; the magnetic suspension supporting system comprises an expansion side magnetic suspension bearing arranged at the output end of the natural gas expansion machine and a compression side magnetic suspension bearing arranged at the input end of the compressor, and is used for realizing non-contact suspension and torque transmission of the rotor; the electric control unit comprises an electric appliance cabinet and a pressure sensor, a converter and a main controller are arranged in the electric appliance cabinet, the converter is connected with a power grid and the high-speed synchronous motor, and the main controller dynamically adjusts the operation mode and power of the high-speed synchronous motor by taking the outlet pressure of the natural gas compressor as a control variable. The natural gas compressor is driven by the natural gas expansion machine and the highly synchronous motor, the unit with the reverse power generation function is adopted, the operation flexibility of the unit is improved, and the comprehensive utilization rate of energy is remarkably increased.

The invention discloses a bidirectional self-adaptive inertia control method and device for an interconnected converter, and the method comprises a voltage source converter structure, a bidirectional inertia control method and self-adaptive inertia coefficient set.The bidirectional self-adaptive inertia control method and device are suitable for an AC-DC hybrid micro-grid so as to balance AC micro-grid frequency and DC micro-grid voltage dynamic response. Virtual synchronous motor control is adopted as a control outer ring to realize power adjustment and emergency control mode switching, an additional virtual capacitor control ring is designed to suppress the influence of high-frequency interference on a differential element, and the method can enable an IC to adjust a working mode to operate in a rectification or inversion state under a self-adaptive operation condition, so that the reliability of the IC is improved. The strategy enables the interconnection converter to smoothly adapt to three operation modes of grid connection, island power adjustment and island emergency control, thereby balancing the dynamic response characteristics of the two modes after disturbance, and achieving the improvement of the overall performance of the AC / DC micro-grid.

The invention discloses a virtual synchronous generator stability improving method and device, and the method comprises the steps: carrying out the impedance modeling of a VSG, and obtaining a VSG impedance model; generating a regulation voltage based on the variable transient virtual damping control scheme; superposing the current loop output voltage and the adjusting voltage, and applying the superposed voltage to a VSG impedance model to adjust the three-phase voltage output by the VSG; in the variable transient virtual damping control scheme, a VSG impedance model is compared with a synchronous motor operation principle according to a power system similarity principle, a transient virtual resistance is calculated by using an angular frequency change output by the VSG and a d-axis current change, and a steady-state virtual resistance and a virtual inductance are calculated by using a direct-current bus voltage fluctuation and a direct-current bus output current change of the VSG; a regulated voltage is determined using the transient virtual resistance, the steady state virtual resistance, and the virtual inductance. The stability of the virtual synchronous generator can be improved.

The invention discloses a performance simulation method, system and equipment of a synchronous motor and a medium, and relates to the technical field of motor engineering and simulation technologies. According to the method, electromagnetic parameters are obtained based on a geometric structure, material attributes and current parameters of a motor; according to loss data in the electromagnetic parameters, calculating to obtain a temperature distribution data set of each component in the motor; according to the electromagnetic force and temperature distribution data set in the electromagnetic parameters, calculating stress distribution and deformation of each component in the motor; carrying out fusion processing on the electromagnetic parameters, the temperature distribution data set and the stress distribution to obtain a fusion data set; fusing the data set to obtain an initial multi-physics field coupling model; performing parameter correction on the initial multi-physics field coupling model to generate a synchronous motor multi-physics field coupling model; and performing simulation according to the synchronous motor multi-physics field coupling model to obtain performance simulation data. By implementing the technical scheme, a reliable basis can be provided for design optimization, performance analysis and fault diagnosis of the motor.

A method for controlling a permanent magnet (PM) synchronous motor in an ESP application is provided. A load angle of the PM motor is estimated. A voltage adjustment value is determined for the PM motor based at least on the estimated load angle of the PM motor. A voltage to be applied to the PM motor is determined based on the voltage adjustment value.

The efficient horizontal snow melting machine comprises an outer shell, an ice making assembly, an ice discharging assembly and a refrigerating system, the ice making assembly comprises an ice making shell, an ice making cup, an ice scraping knife and a synchronous motor, and the ice making shell is arranged at the top of the outer shell; according to the snow melting machine, the water storage cavity is arranged to convey water to the ice making shell, then the refrigerating system is arranged to cool the water in the ice making shell to form ice, then the ice is converted into smoothie through the ice making cup, the ice scraping knife and the synchronous motor of the ice making assembly, and finally the smoothie is output through the ice outlet assembly, so that efficient smoothie production is achieved, the overall structure is practical and reliable, and the snow melting machine is convenient to use. The operation is simple.

The invention relates to the technical field of motor control, and discloses an axial magnetic flux hybrid excitation synchronous motor field weakening control system based on multi-source feedback. According to the system, a motor digital twinborn model is constructed, and real-time operation data are collected by using a multi-source sensor and synchronized to the model; establishing a three-dimensional electromagnetic field state space based on the model, extracting features through a manifold neural operator, and generating a multi-dimensional excitation state feature set; determining an excitation anomaly feature index set according to the feature set distribution density; collecting data in real time, extracting current excitation characteristic parameters, mapping the current excitation characteristic parameters to a three-dimensional electromagnetic field state space, calculating spatial correlation with the abnormal index set, and outputting weak magnetic demand correlation factors; and finally, according to the correlation factor, the feature set and real-time data iteration updating operator parameters, a control instruction is generated to dynamically adjust the coupling proportion of the electrical excitation component and the permanent magnet excitation component. According to the system, comprehensive perception and accurate regulation and control of the motor operation state are realized, and the adaptability and reliability of field weakening control are improved.

The utility model discloses a sand paving guide plate of binder sand blasting 3D printing equipment, which comprises a sand paving assembly, and the sand paving assembly comprises a support frame, a support cylinder, a support column, a support cross beam, a T-shaped groove, a T-shaped slide block and a sand outlet groove. According to the utility model, through the design of the V-shaped groove on the sand guide plate, sand can be more uniformly distributed and flows out through the sand outlet groove, so that the sand can be continuously and uniformly paved in the printing process, and the printing quality is improved; an output shaft is driven to rotate through a bidirectional synchronous motor, so that a gear is driven to move along a toothed plate, then an insertion plate is driven to slide in an insertion groove, the opening and closing number of sand outlet grooves is conveniently and accurately controlled through sliding of the insertion plate in the insertion groove, then the outflow amount of sand materials is controlled, and by controlling the outflow amount of the sand materials, according to the 3D printing requirement, the 3D printing efficiency is improved. And the sand paving thickness is adjusted in real time, and it is ensured that sand of each layer meets the preset requirement.

The present invention provides a permanent magnet synchronous motor and a variable frequency compressor, which relate to the technical field of compressor design and manufacturing. The permanent magnet synchronous motor includes a stator core and a rotor core arranged inside the stator core; the stator core includes stator teeth uniformly distributed in the circumferential direction, a stator yoke is arranged between two adjacent stator teeth, two adjacent stator teeth and the stator yoke between the two stator teeth form a stator slot, and a winding is embedded in the stator slot; a plurality of uniformly distributed eccentric arcs and straight line segments are arranged in the circumferential direction of the outer edge of the rotor core, uniformly distributed magnetic steel plug holes are arranged inside the rotor core, and a groove is arranged between two adjacent magnetic steel plug holes; a permanent magnet with alternating NS poles is arranged in the magnetic steel plug hole. In the present invention, by limiting the inner diameter Rsi of the stator core, the maximum outer diameter Rro of the rotor core and the axial length Les of the stator core to satisfy: 0.455≤Les / (Rsi+Rro)≤1.264, the torque density of the synchronous motor can be increased and the cost can be reduced.

The invention is suitable for the technical field of motor control, and provides a motor control method and device, electronic equipment and a computer program product, and the method comprises the steps: calculating a motor parameter of a synchronous motor according to first data collected by a Hall sensor, and obtaining a first motor parameter, the motor parameter of the synchronous motor comprising a rotating speed and an electrical angle; calculating a motor parameter of the synchronous motor according to second data collected by the observer to obtain a second motor parameter; determining a target motor parameter according to the first motor parameter, a first weighting coefficient corresponding to the first motor parameter, the second motor parameter and a corresponding second weighting coefficient; and controlling the synchronous motor according to the target motor parameter. The precision of motor control can be improved.

The present invention belongs to the technical field of parameter identification for permanent-magnet synchronous motors. Disclosed are a parameter identification method and apparatus for a permanent-magnet synchronous motor, and a storage medium and a device. The method comprises: using a variable step-size feedback neural network algorithm to solve a voltage equation and a d-q axis current discrete state equation, which take cross-coupled inductance into consideration, of a permanent-magnet synchronous motor in a dq coordinate system, so as to obtain intermediate parameters generated in the process of constructing the d-q axis current discrete state equation; and performing calculation on the basis of the intermediate parameters, so as to obtain the stator resistance, the d-axis inductance, the q-axis inductance, the cross-coupled inductance and the permanent-magnet flux linkage of the permanent-magnet synchronous motor, and thereby completing parameter identification. The present invention takes cross-coupled inductance into consideration and uses the variable step-size feedback neural network algorithm, such that the computational load is extremely small, the degree of complexity is reduced, rapid and effective identification can be realized, and errors can be reduced; in different convergence time periods, the algorithm adjusts the step size on the basis of the magnitude of steady-state errors, such that identification results approach stable values more quickly, thereby improving the speed and stability of convergence.

The invention relates to the technical field of new energy grid connection, in particular to a new energy grid-connected inverter system based on a double-stator synchronous motor interface, which comprises a three-phase inverter and a double-stator synchronous motor, the double-stator synchronous motor comprises a first stator, a rotor and a second stator. Planar air gaps exist between the rotor and the first stator and between the rotor and the second stator. The rotor comprises a first rotor and a second rotor which are rigidly connected, the first rotor is axially adjacent to the first stator, the second rotor is axially adjacent to the second stator, and a magnetic isolation ring is arranged between the first rotor and the second rotor; each of the first stator and the second stator comprises a stator core and an armature winding, the first rotor comprises a first rotor core, an excitation winding and a starting winding, and the second rotor comprises a second rotor core and a permanent magnet. According to the invention, the double-stator configuration can realize voltage transformation and frequency conversion functions, and can solve the problems of reduced power grid inertia, insufficient short-circuit capacity, aggravated broadband oscillation risk and the like caused by grid connection of large-scale new energy through power electronic equipment.

The invention provides a bus current estimation method and device of a synchronous motor, equipment and a storage medium. The bus current estimation method comprises the steps of obtaining a corresponding three-phase current sampling value of the synchronous motor in a current control period; the target action duration corresponding to each phase of the synchronous motor in the current control period is obtained; wherein the target action duration corresponding to each phase is calculated in the previous control period of the synchronous motor; and according to the current control period, the three-phase current sampling value and the target action duration corresponding to each phase, calculating to obtain the bus current of the synchronous motor in the current control period. Through the mode, the actual action time of each phase corresponds to the corresponding current sampling value, and the bus current is obtained through calculation on the basis, so that the bus current value is accurate, and estimation precision reduction caused by period lag of the algorithm execution time and the action time is avoided.

The invention provides a grid-connected system and method based on parallel operation power equalization of synchronous motor units, and relates to the technical field of new energy and electric power engineering. The system comprises a new energy station power generation system and a parallel synchronous motor unit group, wherein the parallel synchronous motor unit group at least comprises two synchronous motor units which have the same electrical parameters and are connected in parallel; the first end of the parallel synchronous motor unit group is connected with the new energy station power generation system, and the second end is connected with the power grid. The method comprises the following steps: connecting one ends of all synchronous motor units to the same power supply bus, applying excitation current to the motor at the end, applying excitation current to the motor at the other end, then measuring the generator end voltage waveform, adjusting the relative mechanical angles of the synchronous motor units according to the measurement result, and ensuring that the relative mechanical angles of all the motor units are equal. And power equalization between parallel synchronous motor units is realized. The system structure can be simplified, the cost can be reduced, and the reliability and the flexibility of the new energy grid-connected system can be improved.

The invention relates to the technical field of driving control of symmetrical vacuum pressure control valves, in particular to a zero-point-free zero returning method of a double-position synchronous motor for a symmetrical vacuum pressure control valve, which is suitable for scenes needing high-precision pressure control, such as semiconductor manufacturing, vacuum coating, precision vacuum detection and the like. The problems that in the prior art, the vacuum sealing performance is damaged by depending on a special sensor, cost is high, abrasion of a sealing ring is aggravated due to zero point fixation, and double-shaft synchronization precision and load distribution are disjointed are solved. According to the method, the position where the sealing ring reaches the sealing pre-tightening force serves as a dynamic non-fixed zero point, an additional zero point sensor or a collision sensor or a horizontal sensor is not needed, the current-torque coupling characteristic of a motor is utilized, and full-process automatic control is achieved through a high-precision Hall current sensor and an incremental encoder. The method comprises the following specific steps: initializing motor parameters, establishing a T = K * I mapping relation, calibrating a current overload threshold value, calibrating a current detection module, synchronously starting and operating double motor shafts, identifying a collision state based on current detection, locking and verifying a zero returning position, and judging zero point uniqueness based on torque uniformity. The double-shaft zero returning repetition precision is high, zero point uniqueness judgment fits the actual working condition, uneven abrasion of the sealing ring can be reduced, the service life of the sealing ring and the maintenance period of the valve are prolonged, meanwhile, the equipment manufacturing cost and the maintenance difficulty are reduced, and the vacuum sealing stability and the pressure control precision of the symmetric vacuum pressure control valve are effectively improved.

The invention provides a rigid-flex circuit board thermocompression bonding device and method. The rigid-flex circuit board thermocompression bonding device comprises a positioning assembly, and the positioning assembly comprises a thermocompression seat, a U-shaped thermocompression table, a mounting groove and a controller. The bidirectional synchronous motor drives the adjusting screw rod to rotate, so that the positioning plate is accurately controlled to move, rapid positioning of circuit boards of different sizes is achieved, and it is ensured that the positions of the circuit boards are accurate during hot pressing; the distance between the clamping blocks is adjusted by rotating the knob, the circuit board is firmly clamped, displacement during hot pressing is prevented, the hot pressing precision is improved, meanwhile, the structure can adapt to circuit boards of various sizes, the universality of the device is enhanced, and different production requirements are met; through the pressure sensor, the buffer block and the spring, pressure can be monitored in real time, pressure fluctuation can be buffered, uniform pressure application is ensured, meanwhile, the temperature sensor is matched with the heating pressing plate, temperature is monitored in real time and accurately regulated and controlled, temperature uniformity in the hot pressing process is ensured, bubbles, layering and other defects of a circuit board are effectively reduced, and the product performance and the yield are improved.

The invention discloses a synchronous motor sensorless control method based on a Newton-Raphson predictive phase-locked loop, and relates to the technical field of motor control. The invention aims to solve the problems that an existing position-sensorless control method is limited by extra loss and noise caused by high-frequency signal injection in the aspect of position signal extraction and poor dynamic performance caused by a traditional phase-locked loop technology, and a prediction phase-locked loop technology needs a large amount of iterative operation for solving a cost function. According to the method, the flux linkage estimation value of the alpha-beta coordinate system is observed, the filtered flux linkage estimation value of the alpha-beta coordinate system is reconstructed, and then a cost function is constructed; when the number of iterations in the current motor control period does not reach the maximum, updating a rotor position angle by using a Newton method, and further updating a cost function; and when the number of iterations in the current motor control period reaches the maximum, calculating a convergence angle in the current motor control period by using an improved Newton method, and calculating an angular velocity estimated value, thereby realizing position-sensorless control of the synchronous motor.

The invention discloses an electromagnetic noise suppression control method for a multi-phase self-excitation synchronous motor. A driving system of the synchronous motor comprises a double-closed-loop control system and an inverter. The specific method comprises the steps that the double-closed-loop control system outputs voltage reference signals of all coordinate axes, and all the coordinate axes are arranged in an electromechanical energy conversion plane and a non-electromechanical energy conversion plane respectively; injecting the square wave signal into a selected coordinate axis, and cooperatively adjusting excitation and noise values by using the positive correlation between excitation current and the amplitude of the square wave and the negative correlation between the excitation current and the frequency of the square wave; and then outputting the adjusted voltage reference signal, processing the adjusted voltage reference signal and other voltage reference signals, and outputting the processed voltage reference signal and other voltage reference signals to an inverter to generate a driving voltage. Therefore, the square wave amplitude is synchronously increased and the excitation current is kept stable when the noise reduction of the square wave frequency is improved by utilizing the quantitative relation that the excitation current is positively correlated with the square wave amplitude and negatively correlated with the square wave frequency, so that the load capacity of the synchronous motor is prevented from being reduced.

The invention belongs to the field of synchronous motor rotor position signal acquisition and processing, and particularly relates to a resolver angle compensation method which can improve the motor rotor position signal detection precision. The method comprises the following steps: step 1, acquiring rotary power transformation angle values of n periods; 2, determining an error array of n periods according to the electrical angle value of each period; step 3, performing interpolation calculation on the error array of n periods to obtain a 2-degree error distribution array; and 4, compensating the real-time sampling rotary power transformation angle according to the 2-degree error distribution array.

A torque ripple reduction method for a synchronous electric motor of a vehicle includes obtaining, by a control system, look-up tables (LUTs) that each include harmonic currents that satisfy a constrained objective function for phase current magnitude for the synchronous electric motor, based on a requested motor torque, determining, by the control system and using the LUTs, a plurality of currents including fundamental direct and quadrature currents and 6th order and 12th order harmonic quadrature currents, determining, by the control system, direct and quadrature voltages for the synchronous electric motor based on the plurality of currents including injection of the 6th and 12th order harmonic quadrature currents, and controlling, by the control system, the synchronous electric motor based on the determined direct and quadrature voltages to at least one of reduce torque ripples and increase efficiency of the synchronous electric motor.

The invention discloses a permanent magnet synchronous motor sensorless control method, system and device, and belongs to the field of synchronous motor control, and the method mainly comprises the steps: 1, constructing a reference model and an adjustable model of a permanent magnet synchronous motor sensorless identification system; 2, constructing an adaptive law according to the output of the reference model and the adjustable model; step 3, adopting a given value as input in an identification system, introducing a fuzzy self-tuning PI control algorithm in an identification link, and constructing an improved control algorithm of a permanent magnet synchronous motor sensorless; and 4, performing simulation verification on the improved control algorithm. Compared with a traditional MRAS method, the method is simple in calculation, is not affected by stator resistance change caused by temperature rise, achieves model convergence and stable operation of the system, and has good dynamic performance and steady-state performance.

The invention discloses a motor adaptive harmonic suppression system and method fused with LSTM prediction, and belongs to the technical field of power electronic control. Comprising a harmonic feature extraction module, a trapezoidal angle prediction module, an integral adjustment module and a trapezoidal voltage compensation module. The harmonic feature extraction module converts the three-phase current into dq-axis current; the trapezoidal angle prediction module establishes a model for predicting an optimal initial trapezoidal angle based on a long short-term memory neural network according to the d-axis harmonic current, the motor rotating speed and the bus voltage; the integral adjusting module adjusts a trapezoidal angle on line by inputting a harmonic error; and the trapezoidal voltage compensation module is used for modulating trapezoidal compensation voltage and outputting compensation voltage required by an alpha axis and compensation voltage required by a beta axis. According to the invention, prediction of the long-short-term memory neural network and online adjustment of the trapezoidal angle and modulation of the trapezoidal compensation voltage of the integrator are fused, the harmonic current of the permanent synchronous motor control system can be effectively inhibited, the torque ripple of the motor is reduced, and the performance of the motor is improved.

The present invention discloses a method, device, equipment, and medium for suppressing motor back-electromotive force harmonics. The method includes: obtaining the three-way back-electromotive force of a synchronous motor; transforming the three-way back-electromotive force to obtain a direct-axis back-electromotive force and a quadrature-axis back-electromotive force; performing a Fourier transform on the quadrature-axis back-electromotive force and extracting the amplitude, frequency, and initial phase of each order harmonic of the quadrature-axis back-electromotive force; reconstructing each order harmonic of the quadrature-axis current based on the amplitude, frequency, and initial phase of each order harmonic of the quadrature-axis back-electromotive force; superimposing each order harmonic of the quadrature-axis current to obtain a reconstructed quadrature-axis current; and injecting the reconstructed quadrature-axis current into the quadrature-axis back-electromotive force to obtain the original torque representation value. This solution achieves suppression of motor back-electromotive force harmonics, with excellent harmonic suppression effect.

The invention provides a surface-mounted permanent magnet synchronous motor full-rank online parameter identification method and system, and relates to the technical field of synchronous motors. According to the method, firstly, low-frequency small current is injected into a d axis, deformation is carried out on a voltage equation of the d axis of the motor under the condition, decoupling of the resistance Rs of a stator and other parameters is achieved, on this basis, the resistance Rs serves as a known quantity, decoupling psi f of inductance Ls and flux linkage is achieved through other voltage equations, and finally an identification model of the three parameters is obtained; and finally, a forgetting factor least square recursion formula is combined with an identification model of the three parameters to realize online dynamic identification of the motor parameters. According to the method, the three parameters of the resistance Rs, the inductance Ls and the flux linkage psi f can be identified on line, parameter identification does not depend on the working state of the motor, and real-time identification of the dynamically changing motor parameters in the working process of the motor is achieved.

The invention relates to the technical field of network construction type flexible direct-current power transmission system control, in particular to an oscillation suppression control method for a network construction type flexible direct-current power transmission system. The method comprises the following steps of: firstly, establishing a PI controller of a rectifier-side converter through reference voltage of the rectifier-side converter; then, based on virtual synchronous motor control, constructing a mathematical model of a network-forming controller, extracting an angular frequency error and an angular frequency change rate, and designing a power deviation and an adaptive adjustment rule to realize dynamic optimization of control parameters; and on the basis, generating a reference voltage of the alternating-current side network-building type inverter through the final network-building type controller, and further establishing a PI controller of the alternating-current side network-building type inverter. And finally, in combination with a rectification side PI controller, a network-building type controller and an inversion side PI controller, the stable control and oscillation suppression of the network-building type flexible direct current power transmission system are comprehensively realized.

The utility model relates to an accurate quantitative grinding mechanism for coffee beans, and aims to solve the technical problems that a weighing module structure of an existing similar product is difficult to be integrally assembled and used with a bean grinding assembly, beans are easy to scatter when a bean box of the bean grinding assembly is taken out, the bean box is difficult to automatically lock when the bean box is taken out, and the beans are easy to block in the bean discharging process. The mechanism is characterized in that a bean discharging gear in a bean discharging assembly main body below a bean box at a bean box assembly of the mechanism is driven by a transmission shaft at a synchronous motor on one side of the outer diameter to rotate to discharge beans, and meanwhile, a bean discharging shifting piece is arranged on one side of the bean discharging gear in the bean discharging assembly main body, and one end of the bean discharging shifting piece abuts against one blade of the bean discharging gear; the other end of the bean feeding shifting piece is hinged and fixed in the bean feeding assembly body to swing, a torsion spring is arranged on the hinged position or a positioning column on one side of the hinged position, the shaft portion of a vertically-arranged bean feeding gear is aligned with a bottom hole opening of an upper bean box, and the bottom hole opening of the upper bean box is rectangular. And a bottom hole of the bean feeding assembly main body below the shaft part at the bean feeding gear is aligned with the bean feeding channel.