71 results about "Electromagnetic torque" patented technology

This invention discloses a modeling method for a proxy model of a permanent magnet synchronous motor under eccentric conditions. First, a mathematical model of the eccentric motor proxy model is established, including the permanent magnet flux linkage and no-load back EMF, flux linkage model, voltage model, electromagnetic torque, and torque balance equations. Then, no-load back EMF, permanent magnet flux linkage, and dq-axis inductance data are obtained through finite element simulation, and harmonic fitting is performed on the permanent magnet flux linkage. Next, a multi-dimensional parameterized lookup table covering eccentricity type and degree, speed, torque, and rotor position angle is constructed. The lookup table and interpolation algorithm are integrated into the simulation platform to form a high-fidelity proxy model module that can be called in real time. Finally, the model accuracy is verified by comparison with finite element simulation and experimental data. This invention achieves high-precision and rapid mapping of the electromagnetic characteristics of eccentric motors, balancing modeling accuracy, efficiency, and versatility.

This invention relates to a cascaded fuzzy feedforward direct-drive speed control method and system based on LC filtering. The method includes: obtaining a speed error and error rate of change from a reference speed and a real-time measured speed; inputting the speed error and error rate of change into a Mamdani fuzzy inference engine to output a power setpoint coefficient; inputting the power setpoint coefficient and a normalized measured speed signal into a two-dimensional torque-current reference lookup table, performing bilinear interpolation calculation, and outputting an electromagnetic torque command; converting the electromagnetic torque command into a quadrature-axis command current, generating a PWM signal through current closed-loop regulation and SVPWM modulation, and driving a two-level voltage-type inverter; the output of the two-level voltage-type inverter drives a low-voltage permanent magnet synchronous motor through an LC sine wave filter with an RC damping branch. Compared with the prior art, this invention has advantages such as low computational load, improved dynamic response, and enhanced disturbance rejection.

This invention discloses a high-precision intelligent forming control method, device, equipment, and storage medium for all-electric metallurgical equipment, relating to the field of intelligent control technology for metallurgical forming equipment. The method includes: performing stage self-identification of the metallurgical forming process based on the operating signal of the direct-drive motor to obtain stage identification results; switching the corresponding control strategy based on the stage identification results; controlling the direct-drive motor according to the switched control strategy, and introducing a virtual response mechanism to adjust the dynamic characteristics of the control system during stage switching to obtain adjusted control parameters; determining the forming load based on the mapping relationship between the electromagnetic torque of the direct-drive motor and the forming load, generating control commands based on the forming load, and controlling the output of the direct-drive motor based on the control commands and adjusted control parameters to achieve closed-loop control of the forming force. This achieves high-precision force control and multi-axis synchronous coordination throughout the entire metallurgical forming process without relying on external force sensors.

The application discloses a wind turbine maximum power point tracking control method considering tower shadow effect. Considering that the tower shadow periodic 3P effect will affect the maximum power point tracking effect when the wind wheel rotates, thereby causing the periodic fluctuation phenomenon of electromagnetic torque, and further affecting the wind energy capture efficiency and increasing the transmission chain load, the application corrects the optimal torque curve, and slows down the tower shadow effect by introducing a correction parameter. The correction parameter is obtained from the response surface constructed by the off-line traversal correction parameter, the wind wheel rotation azimuth and the wind condition, and then the response surface model is called online according to the current wind condition and the azimuth to periodically guide the setting of the electromagnetic torque correction parameter of the improved OT method, so as to reduce the negative influence caused by the tower shadow effect. The application slows down the influence of the tower shadow effect on the wind turbine maximum power point tracking, and compared with the traditional OT method, can significantly reduce the transmission chain load fluctuation and improve the wind energy capture efficiency.

This invention discloses a maximum power point tracking (MPPT) control system and method for a pump-driven turbine power generation system. It calculates output power by acquiring DC-side voltage and current, and also acquires rotational speed. Within each MPPT cycle, the operating state is identified by the power-speed slope feature G: when operating conditions change rapidly, the weight of the disturbance observation branch is increased; when approaching the maximum power point, the weight of the adaptive scale fuzzy logic control branch is enhanced. The two branches achieve branch current fusion according to the weights constructed using (|G|), outputting the q-axis stator current increment. A dq current closed loop is used to output a PWM drive signal to control the machine-side converter, adjusting the electromagnetic torque of the permanent magnet synchronous generator, thereby achieving efficient MPPT under time-varying head / flow conditions. This invention relies only on measurable power and speed signals, requiring no precise hydraulic model or data-intensive training, resulting in low computational load, ease of embedded implementation, improved energy recovery efficiency, and suppression of power fluctuations and torque pulsations.

The application discloses a kind of model construction method and device of wind power generation system, the method wind power generation system, at least including wind turbine and permanent magnet synchronous generator, the method includes: the mechanical characteristics of wind turbine is modeled according to momentum theory data to obtain wind turbine model;Maximum power output point of wind turbine is tracked by analyzing wind turbine model and using hill climbing search method;Ideal conditions met by permanent magnet synchronous generator are obtained;Under ideal conditions, three-phase voltage equation under natural coordinate system, flux linkage equation under natural coordinate system, electromagnetic torque equation of motor, mechanical motion equation of permanent magnet synchronous generator are established to obtain permanent magnet synchronous motor model.The application can reduce the loss generated by mechanical rotation in power generation process, so that the power generation efficiency of system is higher.

The application discloses a permanent magnet synchronous motor MTPA control method based on double virtual direct current signal injection, and particularly relates to a motor control method, in particular to a control method of a permanent magnet synchronous motor under a high-speed low-carrier ratio working condition. β A pair of virtual direct current signals with the same amplitude and opposite polarity are injected into a current vector angle, an electromagnetic torque containing the pair of signals is Taylor expanded, subtraction operation is performed on the two to obtain an approximate value of a first-order partial derivative of the torque to the current vector angle, the approximate value is input into an integral regulator, and when the input is controlled to be 0, an optimal current vector angle can be obtained β mtpa , and MTPA control is realized. In order to simultaneously improve dynamic performance and steady-state performance of the control, the method selects virtual direct current signals with different amplitudes to be injected under different working conditions, so that the motor can quickly approach an optimal current vector angle working state, and fluctuation of the current vector angle under a stable state is reduced.

The application discloses a permanent magnet synchronous motor rotating speed control method, related devices and a permanent magnet synchronous motor, relates to the motor control field, and utilizes a dynamic estimation model of fusion of rotor position information, rotating speed information and total load disturbance of the permanent magnet synchronous motor to process the rotor position of the permanent magnet synchronous motor, namely, the rotating speed estimation value of the permanent magnet synchronous motor and the estimation value of the total load disturbance can be obtained. On the basis, the electromagnetic torque value of the permanent magnet synchronous motor is obtained by inputting the rotating speed request value at the current moment, the rotating speed estimation value and the estimation value of the total load disturbance obtained above into the rotating speed loop control model. The rotating speed estimation value and the total load disturbance estimation value of the permanent magnet synchronous motor are more accurate and reliable by only utilizing the rotor position of the permanent magnet synchronous motor, and then the rotating speed estimation value and the total load disturbance estimation value are processed, namely, the electromagnetic torque can be obtained. While reducing the artificial workload, precise control is realized.

This invention discloses a method and system for evaluating the heat dissipation performance of a motor based on temperature rise curve fitting, relating to the field of motor thermal health management technology. The method includes: monitoring the casing temperature and ambient temperature and calculating the temperature rise sequence; collecting current, speed, and cooling characteristic parameters to determine the evaluation period; generating a detection sequence within the evaluation period and injecting current under electromagnetic torque disturbance constraints to obtain a detection thermal input sequence; simultaneously demodulating the detection thermal input sequence and the temperature rise sequence to obtain thermal frequency response estimation and coherence, thereby selecting effective frequency bands and reconstructing a standardized temperature rise curve; fitting the standardized temperature rise curve to obtain thermal impedance parameters and calculating cooling sensitivity under two cooling levels, decomposing convection link parameters and heat conduction link parameters; calculating the heat dissipation deviation and making multi-level judgments, outputting a pre-diagnostic level. By using constrained injection, identifiable thermal excitation is achieved, improving the observability of the evaluation without significantly affecting the output.

This invention discloses a speed and torque control method and system for a permanent magnet synchronous motor. The system includes a voltage frequency domain information calculation module, a third harmonic generation module, a current generation module, a motor transfer function module, and a load torque adaptive control module. It calculates and outputs the fundamental voltage amplitude and frequency based on the motor's mathematical model; outputs the third harmonic amplitude through adjustable coefficients; outputs the dq-axis current, electromagnetic torque, and motor speed using the SHEPWM mathematical model; adjusts the load torque by regulating parameters, outputting an adaptive load torque based on speed feedback; and adjusts the motor speed output by the motor transfer function module according to the adaptive load torque. This invention significantly improves the maximum output torque of the permanent magnet synchronous motor; achieves stable speed control without complex parameter tuning, reducing the difficulty of implementing the control system; and effectively suppresses speed fluctuations introduced by the third harmonic, achieving synergistic optimization between torque enhancement and speed stability.

- Method and system for estimating the electromagnetic torque of a synchronous machine. - The method comprises a measurement step (E1) of the rotor voltage and the stator and rotor currents, a determination step (E2) of a flux-current model of the machine in which the dynamic magnetic uncertainties have a non-zero constant second derivative, a determination step (E3) of a polytopic linear variable-parameter system from the flux-current model, a determination step (E4) of a state observer for the linear variable-parameter system, an estimation step (E5) of the state variables by the state observer, and an estimation step (E6) of the electromagnetic torque from the estimated state variables. Figure for the abstract: Fig. 1

The application provides an electromagnetic rotary energy harvesting device and method based on a double-layer Halbach array, which comprises coaxially arranged rotor and stator assemblies, the rotor assembly is fixed to the shaft end of a rotating machine and rotates synchronously with the shaft end of the rotating machine, the coils of the annular coil assembly are symmetrically distributed according to a three-phase winding and are connected in Y shape, the magnet housing of the stator assembly is provided with magnets and counterweights, the magnets comprise inner and outer ring magnets, the double-layer concentric cylindrical Halbach array is formed by the inner and outer ring magnets, the inner and outer ring magnets are arranged in the coil assembly and are magnetized in a radially staggered manner, the counterweights balance the electromagnetic torque by gravity torque, and the relative rotation of the rotor and stator assemblies is ensured. The double-layer Halbach array is used to concentrate the magnetism of the magnets to the middle annular air gap area, the kinetic energy-electric energy conversion is realized by combining electromagnetic induction, the magnetic stabilization and voltage stabilization are realized by adjusting the arrangement angle of the magnets, and the relative movement of the magnets and the coils is realized without additional fixation of the magnets of the stator assembly by relying on the single pendulum structure of the counterweights.

The application provides a four-legged robot adaptive terrain recognition and navigation method for an explosion-proof environment, and relates to the field of high-definition positioning technology.The application quantifies endogenous disturbance and sensing uncertainty of an actuator by synchronously extracting electromagnetic torque pulsation entropy and point cloud shielding entropy rate;cross-modal feature space alignment is achieved by using bilinear interpolation, and matching is performed based on Mahalanobis distance and a high-precision semantic map;by using semantic space consistency score and a left multiplication disturbance model in a Lie group space, a pose correction vector is output to perform manifold projection correction, thereby eliminating nonlinear drift caused by skidding;high-definition navigation or a tactile stepping strategy is triggered according to positioning reliability, and driving gain is dynamically optimized in combination with energy evolution attenuation gradient.The application effectively solves the problems of sensing non-determinacy and positioning misalignment under explosion-proof working conditions, and improves the navigation robustness and sub-centimeter positioning resolution of the robot in an extreme environment.

The application discloses an optimal tracking rotor control method for reducing the load of a fan transmission chain. When the traditional OTR method is applied to improve the tracking performance of the fan, the fan transmission chain is affected by the high-frequency wind speed in the aerodynamic torque, which causes the frequent fluctuation of the electromagnetic torque and the significant increase of the load. The traditional OTR method is improved, a first-order filter is introduced into the aerodynamic torque loop in the OTR method to filter out the high-frequency wind speed in the turbulent wind speed, the filtering parameters are obtained from the response surface model constructed by the offline traversal filtering parameters and the turbulent wind condition, and then the response surface model is called online according to the current wind condition to periodically guide the improved OTR method filtering parameters, so that the load growth of the transmission chain is reduced in the maximum power point tracking process. The application overcomes the phenomenon that the high-frequency turbulent component in the turbulent wind speed causes the significant growth of the load of the fan transmission chain, and can significantly reduce the load fluctuation of the transmission chain compared with the traditional OTR method, and prolong the service time of the fan.

This invention provides a rotor lamination, a rotor core, a rotor, a motor, and a vehicle. The rotor lamination has multiple mounting slots for mounting permanent magnets. Each mounting slot, with the portion fitted with the permanent magnet, defines a pole arc region between itself and the outer periphery of the rotor lamination. Magnetic isolation bridges are provided on both sides of each pole arc region along the circumferential direction of the rotor lamination. Each pole arc region has multiple through holes distributed at two ends of the pole arc region near the magnetic isolation bridges. The rotor lamination provided by this invention, by providing through holes at the ends of the pole arc region near the magnetic isolation bridges on both sides, optimizes the rotor magnetic field distribution, effectively weakens the cross-axis armature reaction, significantly improves motor torque pulsation, and also enhances the electromagnetic torque of the motor to a certain extent, thus improving the motor's operating performance.

The application discloses a wind turbine dynamic model experiment platform rotational inertia compensation method based on energy flow equivalence. The application is based on the energy angle, and a rotational inertia compensation strategy based on energy flow equivalence is proposed by reproducing the energy flow direction of an actual wind turbine on a wind turbine dynamic model experiment platform. The rotational inertia of the wind turbine dynamic model experiment platform is obtained, the compensation torque is calculated directly by using the theoretical value of the aerodynamic torque and the electromagnetic torque, the aerodynamic torque instruction actually issued is calculated and corrected, the communication time delay of the driving side and the test side control loop of the wind turbine dynamic model experiment platform is obtained respectively, and finally the parameters of the time delay alignment module are determined according to the measurement results. Compared with the traditional rotational inertia compensation strategy based on the rotational speed difference, the rotational inertia compensation method provided by the application does not need to collect the transmission chain information, fundamentally eliminates the acceleration time delay, and has good stability and accuracy when simulating the wind turbine with a hundred times rotational inertia.

The present application belongs to the technical field of magnetic transmission and electromagnetic field numerical calculation, and relates to a dynamic magnetic circuit calculation method for transient electromagnetic torque of a radial magnetic gear. The steps are as follows: first, a two-dimensional grid model of the radial magnetic gear is established and physical material properties are assigned; second, grid element branch permeances are calculated and a global permeance sparse matrix is assembled; third, rotor positions are determined based on kinematic equations and equivalent magnetic flux source vectors are reconstructed; fourth, air gap magnetic flux density is solved and electromagnetic torque is calculated based on Maxwell stress tensor method. The dynamic magnetic circuit calculation method exhibits the characteristics of simplicity and convenience in practical engineering applications, and has excellent parameterization expandability and universality, and can flexibly adapt to performance evaluation of radial magnetic gears with different pole pair numbers and different topological sizes, providing a high-precision calculation tool with strong engineering universality for multi-objective optimization and parameter rapid iteration of magnetic gear transmission systems.

The embodiment of the invention provides a rotor device, an aircraft and a control method, and relates to the technical field of aviation electric propulsion and rotor control. The rotor device comprises blades, a variable pitch execution mechanism, a propulsion motor, a first inverter, a second inverter and a controller. The controller is used for starting a mode switching preset process and reserving a control margin for mode switching under the condition that a preset triggering condition is met; and executing switching from the current driving channel to the target driving channel under the condition that the switching triggering condition is met. The switching process comprises the steps that electromagnetic torques output by the two driving channels are made to change cooperatively through torque gradual change control, the total torque is kept continuous, and a variable-pitch executing mechanism is controlled to adjust the pitch angle according to the torque change so that the variable quantity of the rotating speed of the blades can be smaller than a preset change threshold value. Therefore, the torque peak can be avoided, the basic stability of the rotating speed is ensured, and the problem of rotating speed sinking or thrust sudden change is avoided.

The application discloses a kind of intelligent monitoring method and system of vacuum pump operating state, specifically relates to vacuum pump technical field, the method gathers motor current, rotor position and inlet and exhaust pressure signal, solves real-time electromagnetic torque and motion parameter;With rotor profile and pressure calculation theory aerodynamic load, and calculate inertial torque;Through dynamics decoupling, obtain mechanical friction characteristic residual;Residual is mapped to rotor phase sector, by comparing sector statistical characteristics and global reference value, filter abnormal sector and output the physical angular range of pump cavity mechanical damage.The application effectively eliminates the interference of aerodynamic load fluctuation and speed change to monitoring signal through dynamics model, accurately decouples out pure mechanical friction characteristic, significantly improves the sensitivity and accuracy of early micro-fault identification;Meanwhile, the spatial mapping relationship between residual and rotor angle is established, the transformation of fault feature from time domain to space domain is realized, and the fault troubleshooting efficiency is greatly improved.

This invention discloses a method for monitoring torsional resonance in a permanent magnet semi-direct drive sprocket transmission system of a scraper conveyor, belonging to the field of electromechanical coupling dynamics analysis and condition monitoring technology. A mathematical model of the permanent magnet synchronous motor, a torsional dynamics model of the planetary reducer, and an equivalent load model at the sprocket end are established. A unified electromechanical coupling state space model is constructed using electromagnetic torque, speed, and angular displacement as coupling variables, thereby determining the system's natural frequency. By analyzing the current signal, the mapping relationship between the current and the system's torsional vibration state is analyzed, achieving torsional resonance monitoring of the permanent magnet semi-direct drive sprocket transmission system of the scraper conveyor. This method fundamentally solves many problems, such as the difficulty in ensuring monitoring quality with external sensors under complex working conditions, achieving accurate monitoring and location of system torsional resonance with low maintenance costs. It provides an important theoretical method for realizing the dynamic characteristic analysis and reliable operation of the permanent magnet semi-direct drive sprocket transmission of scraper conveyors.

A dynamic torque standard device based on electromagnetic force principle and a measuring method thereof are used for generating and calibrating dynamic and static torque values based on electromagnetic force. The device generates adjustable electromagnetic torque by using electromagnetic interaction between a power coil and a magnetic field under the condition of fixed shafting structure through constructing a stable magnetic field environment, and establishes a quantitative relationship between torque and electrical quantity by synchronously measuring electrical and motion parameters such as voltage and rotational angular velocity, so as to generate and measure dynamic torque values by controlling programmable current.

This invention discloses a method, system, and storage medium for calculating the self-torque of a bitter coil, relating to the field of water-cooled magnet technology. The method includes obtaining the basic parameters of each coil in a water-cooled magnet; dividing the conductors in the upper or lower half of the coil into several annular grids; determining the coordinates of the grid center points based on the basic parameters; calculating the total radial magnetic field component at each grid center point; using the integral of the current density distribution of each grid over the single-turn cross-sectional area of ​​the coil, which equals the target current flowing through the coil, to solve for the current density distribution at each grid location; calculating the helix angle sine of the current helix path within the grid based on the helix path plane of the grid; calculating the axial current density component of each grid based on the current density distribution at each grid location and the corresponding helix angle sine; and calculating the electromagnetic torque of the coil when the target current flows through it based on the total radial magnetic field component and the axial current density component of each grid.

The application discloses a method for improving transient stability of a network-forming converter in an islanded alternating-current microgrid, and the method comprises the following steps: building a spatial model of the islanded alternating-current microgrid based on a model predictive control strategy, and adding an additional adjustment term in a Q-V loop of a virtual synchronous generator control mode; when a grid-connected converter generates a frequency deviation due to a fault of the microgrid, an electromagnetic torque target function minimization method is used to rollingly optimize the additional adjustment term in the Q-V loop according to angular frequency data at each moment, so that an equivalent input torque and an output torque of the network-forming converter are balanced, and thus the stability of the network-forming converter is restored. The application can effectively reduce the frequency deviation and system oscillation after the fault, significantly shorten the system recovery time, and improve the operation reliability and stability of the microgrid.

The present invention provides a power control method and apparatus for an underwater thruster motor, comprising: acquiring underwater environmental pressure values ​​and underwater thruster motor stator temperature values ​​to generate a comprehensive compensation coefficient; identifying the influence of hydrodynamic disturbances on motor flux linkage based on the rotational speed signal fed back by the underwater thruster motor rotor position sensor, and dynamically correcting flux linkage commands using a sliding mode variable structure control algorithm to suppress flux linkage distortion; adaptively allocating the current components of the motor stator direct axis and quadrature axis according to the thrust requirements of the vehicle, combined with the comprehensive compensation coefficient and the corrected flux linkage commands, and generating a basic drive signal; performing high-frequency shaping on the basic drive signal to output an adapted voltage pulse sequence, and controlling the motor electromagnetic torque to track the target value corresponding to the thrust requirements in real time. This invention improves the operational stability and control accuracy of the underwater thruster motor.

This application relates to a graded response control method for full-power variable-speed pumped storage. The method includes: first, acquiring the real-time DC voltage; if the real-time DC voltage does not deviate from the rated value, the capacitor provides priority support; otherwise, the DC voltage deviation is calculated. Then, if the DC voltage deviation falls within the soft-constraint transition stage range, the capacitor provides primary support, with the rotor gradually providing active power support. Finally, if the DC voltage deviation exceeds the upper limit of the soft-constraint transition stage range or the DC voltage change rate exceeds the limit, the rotor rapidly outputs power to restore the DC voltage. Through graded triggering and hysteresis design with clearly defined thresholds, the response is only activated when the DC voltage exceeds the limit. q The shaft current adjusts the electromagnetic torque, thereby mobilizing the rotor's kinetic energy. Minor daily disturbances do not trigger machine-side actions. This significantly reduces the frequency of electromagnetic torque fine-tuning under high-frequency minor disturbances, lowers the superposition effect of shaft torsional vibration and hydraulic pulsation, and helps reduce damage to mechanical structures such as the rotor and speed governor.

To address the problem that existing technologies, which do not consider torque mismatch under fault ride-through and low-frequency oscillation conditions, cannot avoid system oscillations and shutdowns caused by torque mismatch during fault conditions, this invention provides a load optimization control method for voltage source wind turbines. This method optimizes the power coordination characteristics between the wind turbine's main control system and the converter under voltage source control mode, avoiding system oscillations and shutdowns caused by torque mismatch. Simultaneously, it reduces the load impact on the drive train shaft system of voltage source wind turbines under different grid conditions such as voltage surges, voltage dips, and low-frequency oscillations, thereby improving the mechanical lifespan of the wind turbine throughout its entire lifecycle. By calculating and superimposing electromagnetic torque disturbances based on different control objectives before and after a fault in the voltage source wind turbine, it avoids shutdowns caused by torque mismatch during fault ride-through. Furthermore, by calculating and superimposing electromagnetic torque disturbance components based on the expressions for stator and rotor current disturbance components caused by voltage disturbance components, it avoids load oscillations caused by system oscillations.

The present application relates to a method for suppressing blade vibration, a controller and a wind turbine generator. The method comprises: obtaining a first blade vibration parameter under the working condition that a wind turbine generator has a yaw fault; on the basis of the first blade vibration parameter, determining whether blades are in a pneumatic vibration state or not; in response to the blades being in the pneumatic vibration state, controlling the wind turbine generator to enter an electric operation mode, wherein in the electric operation mode, a generator of the wind turbine generator outputs electromagnetic torque to drive an impeller to rotate, so that the blades exit the pneumatic vibration state. By using the embodiments of the present application, the objectives of effectively suppressing blade vibration and avoiding blade breakage are achieved by adjusting the operation mode of the wind turbine generator, and the advantages of easy operation and high applicability are achieved.

The application discloses a kind of brushless doubly-fed motor natural synchronization operating condition operation characteristic analysis method, comprising: based on the frequency conversion of brushless doubly-fed motor winding, obtain the winding loop voltage equation of brushless doubly-fed motor natural synchronization operating condition;Based on the winding loop voltage equation of brushless doubly-fed motor natural synchronization operating condition, equivalent circuit is deduced and solved;On the basis of equivalent circuit solving result, the power angle of brushless doubly-fed motor is calculated, and then the active output characteristic, electromagnetic torque and excitation characteristic of brushless doubly-fed motor are obtained.The present application can clearly analyze the maximum output power and static performance of brushless doubly-fed motor under the excitation of brushless doubly-fed motor constant voltage source, effectively solve the problem that traditional brushless doubly-fed motor equivalent circuit cannot accurately analyze natural synchronization operating condition operation, and provide a theoretical analysis basis for brushless doubly-fed motor control winding DC excitation control mode.