35results about How to "Improve dynamic response speed" patented technology

The invention discloses a curved surface film covering flatness self-adaptive control method based on machine vision, and relates to the technical field of mechanical arm control. The system comprises a machine vision sensing module, a robot end effector, a composite controller and a distributed clamping jaw array. The method comprises the following steps: acquiring a fringe projection image sequence and dynamic trajectory data of an end effector; performing phase calculation and three-dimensional reconstruction on the image sequence, constructing a digital elevation model and calculating flatness error data; inputting the dynamic trajectory data into a feedforward controller to generate a compensation instruction, inputting the flatness error data into a feedback controller to generate a correction instruction, and superposing to obtain a comprehensive correction instruction; and acquiring a strain sensitivity matrix, distributing the comprehensive correction instruction into displacement execution parameters of each clamping jaw by utilizing pseudo inverse operation, and issuing and executing the displacement execution parameters. According to the method, real-time sensing and active intervention of dynamic deformation are realized, and the yield and batch consistency of curved surface film coating are remarkably improved.

The invention discloses a converter feedforward decoupling control method and system for improving low voltage ride through capability, and the method comprises the steps: firstly carrying out the dynamic lead compensation of a measurement voltage after d-q conversion, so as to actively offset the amplitude attenuation and phase delay introduced by hardware links, such as a low-pass filter, in a measurement link, and restore a real power grid voltage dynamic state; and based on the accurately compensated and corrected voltage signal, positive and negative sequence separation and feed-forward quantity calculation are carried out, and finally a reference voltage instruction is generated. In this way, it can be ensured that the input signal of feedforward control accurately reflects the instantaneous change of the power grid voltage, the dynamic response speed and precision of a control system are greatly improved, current overshoot and oscillation in the voltage drop period are effectively restrained, the low-voltage ride-through capacity of a converter is remarkably enhanced, and the stability of new energy grid connection is guaranteed.

The invention relates to the technical field of thermal management of electronic equipment, and discloses a precise temperature control method for components on a circuit board, and the method comprises the steps: executing multi-dimensional state synchronous sampling through a vertical conduction structure of a heat conduction through hole and a shielding shell, and obtaining the shell temperature, the environment temperature and the load current; processing current data by using amplitude domain judgment filtering and calculating instantaneous thermal power, substituting the instantaneous thermal power into a discretized thermal resistance-thermal capacity observer model to calculate the virtual junction temperature of a component to be subjected to temperature control in real time, and calculating the total thermal regulation power by adopting a strategy of combining virtual junction temperature feedback and power feedforward for control logic; and a target driving current is directly solved based on a thermodynamic reverse physical model, and a semiconductor chilling plate or a heating film is driven to work. According to the method, physical conduction lag is compensated through estimation of the observer, and the dynamic response speed and the steady-state control precision aiming at the load step are remarkably improved in cooperation with thermal resistance parameter self-adaptive calibration.

This invention discloses a phase-shifted full-bridge plasma power supply based on all SiC devices, belonging to the field of special power supply technology. It includes: a rectifier unit with a power factor correction circuit; an inverter unit containing a phase-shifted full-bridge topology composed of SiC power devices and an energy storage inductor, achieving zero-voltage switching through phase-shift control; a transformer unit; an output unit including an output filter capacitor; and a control unit that uses an incremental PID algorithm to generate phase-shift control signals. This invention analyzes the differences in zero-voltage switching between the leading and lagging bridge arms, utilizes the low output capacitance characteristics and dynamic dead-time adjustment of SiC devices, broadens the soft-switching range under light loads, effectively reduces output current ripple, and improves dynamic response speed and overall efficiency.

The utility model provides a printer with an automatic lifting cross beam, which comprises a rack, a printing headstock, a movable cross beam and a printing platform, lifting assemblies used for driving the movable cross beam to move up and down are arranged on two sides of the printing platform, each lifting assembly comprises a mounting plate, and a screw rod is vertically mounted on one side of each mounting plate through a bearing seat. A supporting plate is vertically and slidably connected to one side of the mounting plate, and the top end of the supporting plate is fixedly connected with the bottom end of the movable cross beam; the lead screw is connected with a ball nut, and the ball nut is arranged between the mounting plate and the supporting plate and fixedly connected with the supporting plate through a fastener. Compared with the mode that a ball nut is fixed, and a lead screw rotates and moves in the prior art, the ink-jet printer has the advantages of being smaller in inertia, higher in precision and longer in service life, meanwhile, the ink-jet printer has higher acceleration and dynamic response speed, and can be better suitable for large-breadth ink-jet printing scenes.

This application belongs to the field of DC bus voltage control, specifically disclosing a super-spiral sliding mode active disturbance rejection control method based on an RBF neural network, including the following steps: establishing a mathematical model of a bidirectional Buck / Boost circuit; designing an active disturbance rejection controller, which includes a tracking differentiator and an extended state observer; using an RBF neural network to dynamically optimize the gain parameters of the extended state observer in real time; constructing a super-spiral integral sliding mode controller to replace the nonlinear state error feedback loop in the active disturbance rejection controller; calculating a current reference signal based on the output signal of the tracking differentiator and the observation signal of the extended state observer through the super-spiral integral sliding mode controller; generating a drive signal based on the current reference signal to control the bidirectional Buck / Boost circuit to maintain the stability of the DC bus voltage. This application can effectively improve the stability and disturbance rejection capability of the DC microgrid bus voltage.

The application provides a kind of multi-phase LLC-based direct current converter model prediction device and control method, specifically relates to direct current converter energy conversion technical field.The device includes two-stage converter cascade, input port has S, output port has N.The front stage is composed of S Buck circuits in parallel, each Buck circuit contains an inductor and two MOS tubes;The back stage is composed of N-phase LLC resonant converter, connected with the output port of the front stage Buck circuit.The front bridge of N-phase LLC resonant converter adopts half-bridge circuit, including two MOS tubes, resonant inductor, resonant capacitor and excitation inductor.The device adopts model prediction control method, the output voltage of next cycle is predicted to adjust relevant variables to maintain the purpose of output voltage.The application can access multiple voltage levels, model prediction control can be performed on direct current converter, voltage of specified voltage level can be output, voltage output can be effectively adjusted, and the demand of multi-scene application can be met.

A multi-circle angular displacement measuring device based on a single gear structure comprises a shell, a rotating shaft, a driving wheel, a driven wheel, magnetic steel, a deep groove ball bearing, a circuit board and a Hall chip. Three deep groove ball bearings are respectively mounted in holes in the upper and lower end faces of the bottom of the shell; the small-section end of the rotating shaft penetrates through the first deep groove ball bearing and the second deep groove ball bearing, and the root of the rotating shaft is inserted into a mounting hole of the driving wheel. The driving wheel is fixed with the inner ring of the deep groove ball bearing II; the first magnetic steel is installed in a groove of the driving wheel. A driven wheel is fixed with an inner ring of the deep groove ball bearing III, and teeth of the driven wheel are meshed with teeth of the driving wheel; the second magnetic steel is installed in a groove of the driven wheel. The circuit board is arranged on a boss in the shell; the first Hall chip and the second Hall chip are installed on the circuit board and axially correspond to the first magnetic steel and the second magnetic steel respectively. The device is high in vibration resistance, small in accumulative error, high in positioning precision, absolute in mechanical measurement, capable of achieving real absolute multi-circle angle measurement and capable of being used for application needing to track multiple rotation periods.

This disclosure provides a disturbance suppression method for grid-connected energy storage converters. By introducing an improved timing disturbance observer, it achieves rapid and accurate estimation of lumped disturbances such as grid voltage fluctuations and load abrupt changes. Combined with an adaptive sliding mode control algorithm, it dynamically adjusts the switching gain based on the sliding mode surface error, forming an observation-compensation closed-loop suppression mechanism. Simultaneously, relying on a multi-loop collaborative architecture consisting of voltage outer-loop sliding mode control, current inner-loop PR control, and capacitor voltage balance PI control, it achieves hierarchical suppression and decoupled control of multi-dimensional disturbances. Furthermore, it introduces a parameter adaptive optimization mechanism based on disturbance characteristics and device temperature, thereby significantly improving the dynamic response speed and steady-state accuracy of the system under weak grid conditions and complex operating conditions, reducing the DC voltage fluctuation amplitude, and comprehensively improving the system's stability, power quality, and wide-temperature-range operational reliability.

The application discloses a digital integral mode constant conduction time control system and method of a switching power supply, and the system comprises: a pulse signal output by a DIMCOT control module in a load change transient state is used to control a PWM waveform of a PWM generation module to change from a first level state to a second level state, a counter of a constant conduction time generation module is triggered to start counting according to the second level state, and when a count value reaches a preset value, a reset signal is generated, so that the PWM waveform of the PWM generation module changes from the second level state to the first level state, thereby obtaining a square wave signal with a preset duty cycle, and then the opening or closing of the switching power supply is controlled, and the constant conduction time of the switching power supply is realized. Thus, the switching period is changed in the load change transient state to quickly increase the PWM duty cycle, there is no inertia link in linear control, the system delay is reduced, and faster transient response, higher light load efficiency and more flexible control strategy are achieved.

The application discloses a power prediction method and device of a photovoltaic and photo-thermal coupling system and electronic equipment. According to the application, the energy distribution of solar radiation between the photovoltaic and photo-thermal units is modeled based on multi-source sensing data, the equivalent input energy of the two types of units is accurately obtained to predict the output power respectively, and the system operation parameters are dynamically optimized through evaluation indexes, so that the dynamic changes of sudden working conditions are fully adapted, the power prediction accuracy and dynamic response speed of the photovoltaic and photo-thermal coupling system are improved, the system operation parameters are optimized, the safe and stable operation of the power grid is ensured, resource waste is reduced, scheduling efficiency is improved, operation cost is reduced, high-precision requirements under complex environments are met, and the technical effect of promoting technology popularization and application is achieved.

The utility model provides a kind of elastic cycloidal pin gear reducer, comprising: driving part, cycloidal transmission part and elastic buffer part;The driving part includes motor top shell, conveying sleeve, motor shell, motor stator and motor bottom shell, the conveying sleeve is installed in the top of the inner wall of motor shell, the motor stator is installed in the inside of motor shell, the motor bottom shell is installed in the bottom of motor shell.The utility model provides a kind of elastic cycloidal pin gear reducer, compared with traditional inner rotor motor axial dimension shorter by the use of motor top shell, conveying sleeve, motor shell, motor stator and motor bottom shell, the double closed-loop feedback of cooperation motor encoder and output encoder, power response speed is accelerated, adapts to the scene of high dynamic performance requirement such as industrial robot joint.

The present application relates to the field of industrial control technology, in particular to a shear parameter adaptive control method and system for multi-hardness materials, which comprises pre-pressing and applying a micro-disturbance signal to the material to be processed, extracting the complex impedance spectrum characteristics of the dynamic mechanical response to construct the frequency domain fingerprint of the internal heterogeneous structure; predicting the load mutation based on the fingerprint to generate a virtual control trajectory based on the shear knife holder displacement; using a predictive trajectory planner to calculate the feedforward torque compensation, superimposing it with the position feedback adjustment amount to generate the optimal blade gap and shear speed cooperative motion instruction adaptive to the current hardness; the present application realizes non-destructive detection of internal hardness mutation of the material through frequency domain fingerprint technology, and uses the feedforward compensation mechanism based on inverse dynamics to adjust the driving torque and mechanical gap synchronously before the shear mutation occurs, solving the problems of response lag and easy blade collapse in the processing of heterogeneous materials.

The invention relates to the technical field of semiconductor manufacturing equipment, in particular to a pressure control system of a wafer vertical process furnace. Comprising a process chamber; the gas inlet unit supplies process gas to the process chamber; the exhaust unit comprises a vacuum exhaust loop, a normal pressure / micro-positive pressure exhaust loop and an interlocking mechanism; the vacuum exhaust loop vacuumizes the process chamber to a vacuum or low-pressure state; the normal-pressure / micro-positive-pressure exhaust loop is used for exhausting when the process chamber is in a normal-pressure or micro-positive-pressure state; the interlocking mechanism is used for ensuring that only one loop is conducted with the process chamber; the sensing unit comprises a pressure sensor for monitoring the pressure in the process chamber; and the central control unit selectively conducts the vacuum exhaust loop or the normal pressure / micro-positive pressure exhaust loop through an interlocking mechanism. The pressure control system solves the problems of poor safety, low control precision and insufficient automation degree caused by single function or low integration level of the pressure control system of the wafer process furnace in the prior art.

The application discloses a kind of intelligent laser head with molten pool monitoring, belong to laser welding technical field.The application of a kind of intelligent laser head with molten pool monitoring, including device shell, fiber laser and molten pool detection head, the lower end of positioning support is provided with clamping plate, magnetorheological fluid damper is installed between clamping plate and positioning support, two micro piezoelectric ceramic drive structures are provided in molten pool detection head, lens assembly is provided in molten pool detection head.The application solves the problem that existing laser welding head cannot ensure the long-term stability of processing focal point and monitoring line in hot machine state, the angle and position of lens assembly and built-in lens can be changed in the application, the lens position is adjusted reversely according to real-time temperature, actively compensates the optical path deviation caused by thermal expansion, lens assembly changes from passive heat to active real-time correction, ensures the long-term stability of processing focal point and monitoring line of lens assembly in hot machine state, improves work effect.

The application discloses a kind of precision manufacturing annular permanent magnet synchronous motor anti-interference control methods, comprising:1, design annular permanent magnet synchronous motor;2, according to the annular permanent magnet synchronous motor of design constructs annular permanent magnet synchronous motor second-order motion equation;3, based on annular permanent magnet synchronous motor second-order motion equation, constructs adaptive nonlinear disturbance observer;4, based on fixed time control principle, design single-loop speed-current fixed time controller and fixed time d-axis current controller, obtain q-axis reference voltage and d-axis reference voltage.The application can improve the response speed of annular permanent magnet synchronous motor, steady precision, control bandwidth, and then improve the machining precision of precision manufacturing system.

The invention discloses a single-stage AC-DC converter control method, system, device and equipment and a storage medium, and belongs to the field of electric energy conversion, and the method comprises the steps: simplifying a duty ratio expression according to a whole power factor control strategy, and obtaining a simplified conduction duty ratio; determining a Taylor expansion point according to the simplified conduction duty ratio to obtain theoretical conduction time; timing is started from the switch conduction moment of the current switching period until demagnetization is detected to be finished, counting is carried out, a predicted value of the next switching period is obtained, and a conduction time predicted value of the next switching period is determined based on the theoretical conduction time; and determining the conduction time correction based on output voltage closed-loop control, and superposing the conduction time predicted value of the next switching period and the conduction time correction to obtain the final switching conduction time so as to realize control of the single-stage AC / DC converter. According to the invention, the equivalent switching frequency can be improved, the power density of switching power supply products is improved, the device stress is reduced, and the model selection cost is reduced.

The invention relates to the technical field of liquid supply pipelines, in particular to a mining remote liquid supply pipeline multi-pump cooperative pressure control method which comprises the following steps: firstly, acquiring multi-pump operation data through intelligent sensing equipment, performing characteristic analysis in combination with target process parameters, and extracting liquid supply pressure characteristics; and then, performing control interaction on multiple pumps by utilizing the target parameters and the pressure characteristics, and analyzing real-time pressure demand information. And performing cooperative calculation based on the demand traversal pressure characteristics, and formulating a multi-pump cooperative control strategy. A simulation execution mechanism is innovatively introduced, real-time monitoring is conducted on the strategy before the strategy is issued, a simulation result is generated, the control strategy is dynamically optimized and updated according to the result, and finally intelligent cooperative pressure control over the multiple pumps is achieved. According to the method, the problems of uneven multi-pump pressure, response lag, high energy consumption and the like in traditional control are effectively solved, and the stability, the safety and the energy efficiency level of the system under complex working conditions are improved through simulation, monitoring and closed loop correction.

The utility model discloses a replaceable air filter core air inlet pressure stabilization chamber, internal combustion engine and unmanned plane, include: the pressure stabilization chamber body, its inside constitution is used for stabilizing the main cavity of airflow, throttle flange, set up in the upstream end of pressure stabilization chamber body, be used for connecting throttle body, air inlet flange, set up in the downstream end of pressure stabilization chamber body, be used for connecting engine, air filter core box, it is connected with the installation mouth of being set up on the pressure stabilization chamber body wall surface in detachable mode to embed in main cavity, air filter core, its accommodation is in the inside of air filter core box, wherein, the airflow of flowing through throttle flange is after entering main cavity, passes through air filter core and filters, finally is transported to engine through air inlet flange.

The invention discloses an ultra-precise three-axis air floating platform, which adopts the collaborative design of a vacuum preloading air floating guide rail and a porous throttling air floating bearing, and combines the nanoscale feedback of a high-precision linear grating ruler and the adjustment of a closed-loop control system to realize the nanoscale position repetition precision of an XY plane and the lifting precision within + / -1nm of a Z axis; the full-air-floating non-contact structure eliminates mechanical friction, the elastic buffering and self-adaptive adjusting capacity of an air film compensate machining and assembling errors, and the multi-frequency-band vibration isolation of the air-floating vibration isolation device is matched, so that vibration transmission and motion resistance are effectively reduced, the operation stability of equipment is improved, the service life of the equipment is prolonged, and the maintenance cost is reduced; the combination of gravity balancing of a friction-free air cylinder and driving of a linear motor is adopted, and guiding of a U-shaped guide rail is matched, so that friction-free lifting and sub-nanoscale position control are achieved; x / Y-axis dual-motor linkage is cooperated with the air bearing, so that the track smoothness and the dynamic response speed are improved, and the dynamic requirements of complex linkage processing or measurement are met.

The application discloses a motor position and speed double closed-loop control method based on an improved carbon black four-angle bee algorithm, and belongs to the technical field of PID control, and the specific steps comprise the following steps: S1, a position and speed double closed-loop control model based on a PID controller is established; S2, the carbon black four-angle bee algorithm is improved, which comprises introducing a nonlinear temperature balance mechanism, a chaotic gravity inertia guidance strategy and an asymmetric power law sinusoidal disturbance, and updating population positions in combination with a multi-source fusion method; S3, the improved carbon black four-angle bee algorithm is used to optimize control parameters of the PID controller in the position and speed double closed-loop control model, and a group of optimal PID control parameters Kp, Ki and Kd are obtained through algorithm optimization; and S4, the PID controller of the position and speed double closed-loop control model is simulated; the improved algorithm not only improves optimization precision and robustness, but also improves dynamic response speed and steady-state precision of the double closed-loop control system.

This invention provides a cascaded controlled current source system based on supercapacitor energy storage, relating to the field of current source technology. The system includes: a three-phase NPC three-level rectifier module; a BUCK buck converter; a dual-tube parallel H-bridge inverter module; a current sampling unit located on the secondary side of the current-boosting transformer for real-time acquisition of the current flowing through the fuse under test; and an inverter-side proportional resonant controller. The input terminal of the inverter-side proportional resonant controller is connected to the output terminal of the current sampling unit to receive the error between the feedback current and the reference current command. The output terminal is connected to the drive terminal of the dual-tube parallel H-bridge inverter module. The proportional resonant controller has infinite gain at the fundamental frequency to ensure that the output current tracks the reference command without steady-state error. This invention can reduce grid capacity requirements while achieving a high-precision constant current control for a large current source.

The application discloses a magnetic suspension micro gas turbine power station and a control method thereof, and belongs to the technical field of micro gas turbine power generation. The magnetic suspension micro gas turbine power station comprises a micro gas turbine, a magnetic suspension motor and an electronic control system. The micro gas turbine is one of a type without a regenerator, a type with a built-in regenerator or a type with an external regenerator. The air inlet of the centrifugal compressor of the micro gas turbine is arranged in the magnetic suspension motor, and the motor stator is fixed in the air inlet. The centrifugal compressor and the radial turbine are back-to-back arranged on the rotating shaft, the radial turbine is fixed on the cantilever end of the rotating shaft and located outside the two radial magnetic bearings to form cantilever support, and the centrifugal compressor, the radial turbine, the motor rotor and the magnetic bearing rotor adopt a coaxial mounting structure. The application also adopts a double cooling gas path and a three-ring nested control strategy, and realizes high integration, oil-free, efficient cooling and precise dynamic control of the power station.

The invention relates to the technical field of automatic control and image recognition, and particularly discloses a hollow rotating platform positioning system based on intelligent image recognition. The system comprises a hollow rotating platform body, a high-precision encoder, a visual reference module with a specific reference pattern, a high-speed image acquisition module, a real-time error resolving module and a dynamic compensation controller. According to the method, a visual reference and image recognition technology is introduced, and an absolute space reference system independent of a platform mechanical shaft system is constructed. The system can directly measure and quantify real-time geometric errors generated by vibration and deformation of a platform during operation by resolving sub-pixel-level offset of an image acquisition module on a rotating part relative to a fixed visual reference in real time, and changes maintenance of positioning precision from dependence on periodic off-line calibration to online real-time sensing and compensation. The problem of accumulative errors caused by calibration parameter failure in a traditional method is solved.

The embodiment of the application provides a kind of hydraulic suspension system control method, vehicle and computer readable storage medium, the method comprises: obtaining the target actuation force of hydraulic suspension system, actual actuation force and working state parameter;Based on target actuation force, actual actuation force and working state parameter, determine the weight distribution coefficient of feedforward control quantity and feedback control quantity in hydraulic suspension system, and the amplitude limiting threshold of feedback control quantity;Amplitude limiting threshold is based on the amplitude limiting processing of feedback control quantity, obtains the feedback control quantity after limiting amplitude;Based on weight distribution coefficient, the weighted summation of feedforward control quantity and the feedback control quantity after limiting amplitude is obtained, obtains target control quantity, and based on target control quantity, control is carried out to hydraulic suspension system.The application solves the technical problem that the control accuracy of hydraulic suspension system in the related art is low.

The application discloses a control method and an inverter welding machine system of a dual-voltage inverter welding machine. In the initial stage of power-on, an AC power grid voltage is collected, and a three-phase line voltage signal is extracted; the three-phase line voltage signal is sent to a main control unit for algorithm determination, so that the current input system is identified as three-phase 220V or three-phase 380V, and a target control parameter set including at least a bus voltage stabilizing threshold, a PWM drive duty cycle reference and current closed-loop curve parameters is automatically matched and generated; the aforementioned parameters are used as control instructions to drive a silicon carbide power device to perform high-frequency inversion to output initial welding direct current; output end voltage and current are sampled in real time, and corresponding theoretical reference values are extracted from the closed-loop curve, and a dynamic deviation is calculated by comparison, so that the PWM drive duty cycle is closed-loop regulated. The application realizes full-automatic identification and debugging-free of dual voltage, deeply links voltage identification with silicon carbide high-frequency drive and digital closed-loop compensation, and can greatly improve welding constant current control precision and stability.

This invention discloses a high-order all-drive motor modeling and control method based on a strict feedback structure, belonging to the technical field of motor control. The method includes: establishing fundamental electrical-mechanical-force coupling equations to describe the coupling relationship between the electrical subsystem, mechanical motion subsystem, and electromagnetic thrust subsystem; performing Taylor expansion on the fundamental coupling equations and constructing coupled dynamic equations by combining instantaneous electric power; converting the coupled dynamic equations into a high-order strict feedback nonlinear system model; converting the high-order strict feedback nonlinear system model into a high-order all-drive model; constructing a trajectory tracking control law; solving for the feedback gain vector using a parameterized configuration method; and performing Lyapunov stability analysis on the all-drive closed-loop LSRM system to ensure system stability and tracking performance. This invention provides a unified modeling of the high-order nonlinear coupling relationship of linear switched reluctance motors, effectively preserving the physical characteristics of the system, improving model accuracy, and expanding the applicable operating conditions of the system.

This invention discloses a method for integrating frequency detection function into a software phase-locked loop (PLL) of a three-phase converter, relating to the field of data processing. The method includes the following steps: Step S1, obtaining the grid voltage in a three-phase stationary coordinate system and converting it into a coordinate system grid voltage. Compared with existing technologies, the advantages of this invention are: This invention overcomes the limitations of low-bandwidth PLLs on frequency response, significantly improving the dynamic response speed and steady-state accuracy of frequency detection, while also possessing good anti-interference capabilities, solving the problem of balancing response speed and detection accuracy in traditional solutions; without changing the PLL PI parameters to ensure converter impedance stability and weak grid adaptability, the calculated real-time angular frequency is used as a feedforward value to replace the fixed feedforward, effectively improving the PLL's tracking speed for grid frequency changes; and it saves software resource costs.

The application provides a kind of inverter DC welding machine feedforward high-precision feedback control system and method, it is related to inverter DC welding machine control technical field.The voltage sampling end of the system is set between full-bridge rectifier module and output reactor, and the current sampling end is set between output reactor and output terminal.The application effectively avoids inductance back electromotive force and cable voltage drop interference by placing voltage sampling point in front of output reactor, significantly improves feedback sampling accuracy by combining isolated sampling and anti-interference filter circuit;At the same time, a feedforward compensation module is introduced, which calculates the reactor and cable voltage drop in advance according to the real-time welding current and adds it to the control signal to form a "feedforward compensation + high-precision feedback" dual mechanism cooperative control.The application has fast dynamic response speed, strong anti-interference ability and high steady-state control precision, and can meet the demand of high-precision MIG / MAG welding process.

This invention discloses a driving method and apparatus for a permanent magnet synchronous motor (PMSM). The method involves acquiring the actual speed feedback signal of the PMSM, performing speed loop adjustment calculations at a first control frequency based on the speed deviation between the speed command and the actual speed feedback signal, and generating a current command. Based on the current deviation between the current command and the actual current sampling value of the PMSM, performing current loop adjustment calculations at a second control frequency, and generating a voltage vector control signal. Since the second control frequency is N times the first control frequency and M times the PWM carrier frequency, the pulse width of the PWM drive signal can be updated M times within one PWM carrier cycle according to the voltage vector control signal to drive the PMSM. This application significantly improves the control bandwidth and dynamic response speed of the current loop by increasing the execution frequency of the current loop relative to the speed loop and the PWM carrier frequency, thereby enhancing the anti-disturbance capability and tracking accuracy of the entire servo system.