58 results about "Torque ripple" patented technology

This invention discloses a highly generalizable method for diagnosing open-circuit faults in multi-transistor converters of motor drive systems. This method addresses open-circuit faults in power devices caused by overcurrent surges, poor heat dissipation, and other factors, preventing damage to the motor and power grid equipment caused by output current distortion and increased torque ripple. The method analyzes the retention characteristics of the positive and negative regions of the three-phase stator current under steady-state operating conditions to construct a fault location function, and combines auxiliary variables to accurately distinguish between single-power and dual-power device open-circuit faults. This invention enables rapid location and accurate identification of complex open-circuit faults such as those in opposite phases on the same side or in opposite phases on opposite sides. It offers advantages such as high diagnostic accuracy, strong ability to distinguish mixed faults, and non-invasiveness, making it suitable for motor drive systems with high requirements for operational reliability and fault tolerance.

Provided in the present application are a rotor lamination and a forming method therefor, a rotor iron core, a servo motor and a robot. The rotor lamination comprises a lamination body (1), the lamination body (1) having a rotor outer circumference (2); under one pole, the rotor outer circumference (2) of the lamination body (1) is provided with a groove (3) recessed inwards relative to the rotor outer circumference (2) and / or a protrusion (4) protruding outwards relative to the rotor outer circumference (2). According to the rotor lamination of the present application, the stamping precision of the outer contour of the rotor lamination can be improved, allowing a reduction in the cogging torque and torque ripple of the electric motor, and thereby improving the positioning accuracy of the robot.

This invention relates to a low-current harmonic direct torque control method for a dual three-phase permanent magnet synchronous motor (PMSM), belonging to the field of PMSM control technology. The method is as follows: S1: Establish mathematical models of the fundamental and harmonic subspaces of the dual three-phase PMSM under vector space decoupling, and clarify the voltage vector distribution characteristics of the two subspaces; S2: In the fundamental subspace, design a duty cycle modulation strategy based on the principle of minimizing the error vector, and an improved deadbeat flux linkage torque controller; S3: In the harmonic subspace, design an online learning harmonic canceller, using the least mean square algorithm to update the weight coefficients in real time; S4: Select the D1 vector set as the effective vector of the harmonic subspace and perform sector division; S5: Add the effective voltage vector action time of the fundamental and harmonic subspaces to generate the final switching sequence, which is output to the dual three-phase inverter to effectively suppress torque ripple and harmonic current of the dual three-phase PMSM.

The application discloses a low-pulsation inverse-cosine plus third-harmonic auxiliary salient pole type radial permanent magnet motor and a method for optimizing air gap harmonics, and belongs to the technical field of motor manufacturing. A novel radial permanent magnet synchronous motor with inverse-cosine plus third-harmonic auxiliary salient poles is provided, and the method can suppress air gap flux density harmonics and reduce torque ripple and average torque loss. The specific process is as follows: the rotor air gap flux density is proportional to the rotor magnetomotive force, and the main air gap flux density harmonic order affecting the torque ripple is determined. The inverse-cosine plus third-harmonic method is used to modify the auxiliary salient poles, so as to reduce the air gap flux density harmonics, especially the 9th, 11th, 19th and 21st harmonics causing the first and second order torque ripples, thereby reducing the torque ripple; since the third harmonic is not the main air gap flux density harmonic causing the torque ripple, the injection of the third harmonic can reduce the average torque loss.

This application discloses a motor harmonic suppression method based on parallel PR controllers. The method includes: acquiring the real-time speed of the motor, the D-axis error current, and the Q-axis error current; determining the switching status of each PR controller based on the real-time speed and the corresponding lower and upper speed limits; inputting the D-axis error current and Q-axis error current into the activated PR controller to obtain the D-axis harmonic compensation voltage and Q-axis harmonic compensation voltage; inputting the D-axis error current and Q-axis error current into the corresponding D-axis current loop controller and Q-axis current loop controller to obtain the D-axis voltage and Q-axis voltage; adding the D-axis harmonic compensation voltage and the D-axis voltage to obtain the D-axis target voltage; adding the Q-axis harmonic compensation voltage and the Q-axis voltage to obtain the Q-axis target voltage; and generating a control signal for driving the motor based on the D-axis target voltage and the Q-axis target voltage. This effectively reduces torque ripple and noise caused by motor current harmonics.

This invention proposes an innovative model predictive control-based current control method and system for permanent magnet synchronous motors (PMSMs), aiming to address the problems of slow dynamic response and low control accuracy in traditional control methods when facing parameter variations and external disturbances. By constructing an accurate mathematical model, this invention not only improves the dynamic response speed and control accuracy of the motor but also significantly reduces torque ripple, thereby enhancing the stability and reliability of motor operation. Furthermore, the introduction of intelligent algorithms such as neural networks or fuzzy logic, as well as adaptive control algorithms, further enhances the system's adaptability and robustness. The application of space vector modulation technology optimizes the current waveform, further reducing torque ripple and improving the smoothness of motor operation. The control method of this invention is suitable for industrial applications with extremely high requirements for dynamic performance and control accuracy, demonstrating its broad application potential in the field of modern industrial motor control.

This invention relates to a method and system for suppressing torque ripple during inter-turn short-circuit faults in permanent magnet synchronous motors (PMSMs), belonging to the field of fault-tolerant control technology for inter-turn short-circuit faults in PMSMs. The invention aims to address the shortcomings of existing technologies in suppressing torque ripple caused by inter-turn short circuits and the lack of system strategies for two-phase composite faults. First, mathematical models of the motor under normal, single-phase, and two-phase inter-turn short-circuit fault conditions are established to analyze the generation mechanism of torque ripple. When a single-phase inter-turn short circuit occurs, a compensation current is injected into the three-phase stator current to completely cancel out the torque ripple term. When a two-phase inter-turn short circuit occurs, the compensation components caused by each phase fault are calculated based on the principle of linear superposition and then injected together to obtain the three-phase reconstructed reference current. This invention can be used for the smooth and fault-tolerant operation of PMSMs after inter-turn short-circuit faults, and is particularly suitable for applications requiring high torque stability, such as electric vehicles and servo drives.

This invention provides a self-starting synchronous reluctance motor rotor, a motor, and a compressor. The self-starting synchronous reluctance motor rotor includes a rotor core and end rings. The rotor core includes a first rotor lamination and a second rotor lamination. The first rotor lamination has a first filling groove, a second filling groove, and a slit groove. The first filling groove and the slit groove are arranged in the same layer. The second filling groove is located on the outermost layer in the q-axis direction of the rotor and is not in the same layer as the slit groove. The second rotor lamination can completely or partially cover the second filling groove on the first rotor lamination. According to this invention, harmonics generated by eddy currents in the second filling groove can be reduced, the harmonic content of the motor can be reduced, the torque ripple rate and vibration noise of the motor can be improved, and the reliability of motor operation can be enhanced. By effectively reducing magnetic field harmonics, torque ripple and vibration noise problems caused by harmonics can be avoided.

This invention relates to a rotor slot structure and design method for a large hollow, low-iron-loss permanent magnet synchronous motor, aiming to suppress motor losses and improve performance through slot optimization. The structure determines the optimal elliptical rotor slot structure by comparing the no-load and load performance of motors with different rotor slot shapes. Using single-factor experiments, quadratic regression analysis, and response surface methodology, the influence of the positions a1 and a2 of the first and second rotor slots, the short radii b1 and b2, and the long radii c1 and c2 on motor performance is systematically investigated, and the optimal combination of structural parameters is selected. After applying this optimal elliptical rotor slot structure, the core performance of the motor is significantly optimized: iron loss is reduced by 11.87%, cogging torque by 44.98%, and torque ripple by 1.3%, with almost no negative impact on motor operating efficiency and output torque. Furthermore, this slot structure is simple to manufacture, widely applicable, and can precisely adapt to the rotor structure design requirements of large hollow permanent magnet synchronous motors, balancing performance improvement and engineering applications.

This invention discloses a fault-tolerant control method for suppressing torque ripple in a dual three-phase permanent magnet motor, belonging to the field of multiphase motor control. The method includes: real-time calculation of the controller output, inverter output, and actual motor voltage; real-time calculation of voltage residuals, designing a cooperative voltage compensation form for the fundamental and harmonic planes, and generating a compensation voltage reference value; setting a voltage residual threshold, and dynamically limiting the residual within the threshold range by adjusting the compensation coefficient; and switching a fault-tolerant algorithm to complete fault-tolerant control. This invention maintains stable motor operation without waiting for fault diagnosis and location, providing a good environment for fault diagnosis. Switching to a normal decoupling fault-tolerant algorithm further suppresses torque ripple. This invention is applicable to open-circuit faults in any phase and two phases, without changing the original vector control structure, is easy to integrate, and significantly improves the overall operating performance and reliability of the system under fault transients and fault-tolerant steady states.

The application discloses an open-winding surface-mounted PMSM online data-driven harmonic injection ripple suppression method, belongs to the field of open-winding permanent magnet synchronous motor torque ripple suppression, and is applied to a common DC bus type open-winding surface-mounted permanent magnet synchronous motor driving system. In each sampling period, the method updates three recent sampling values of zero sequence current and zero sequence voltage, constructs a stator current prediction mathematical model containing the zero sequence current, calculates a zero sequence loop motor parameter related polynomial by using an online data-driven technology, obtains a harmonic current injection reference value capable of suppressing the zero sequence torque, and thus the suppression of torque ripple is realized. Meanwhile, the method effectively solves the problems of the decrease of zero sequence current prediction accuracy caused by parameter mismatch and the problem that the system state data-driven identification accuracy is proportional to the amount of online data used without increasing the hardware cost.

The application discloses a torque ripple suppression method of a permanent magnet propulsion motor, which comprises the following steps: inputting a mechanical rotating speed, a reference rotating speed and a rotating speed difference between the mechanical rotating speed, three-phase currents and electricity into an improved rotating speed and torque prediction control module, calculating three-phase counter electromotive forces, calculating a predicted torque, and finally calculating a q-axis reference current at k time; inputting a d-axis reference current, dq-axis currents and voltages, alpha-beta-axis currents and voltages and the q-axis reference current into an improved three-step finite set model prediction module, calculating a dq-axis current prediction value at k+1 time, and performing delay approximation processing on the dq-axis reference current to obtain a current at k+2 time; and finally calculating a dq-axis predicted voltage at k+1 time, determining a predicted current component at next time, and calculating a predicted torque from the current component and a counter electromotive force, so that accurate torque prediction is completed only by iteration twice, and the prediction accuracy and system stability are enhanced.

This application provides a stator and rotor optimization design method for a permanent magnet synchronous motor, including: Step S1, establishing a parametric electromagnetic model based on the main dimensions and performance targets of the permanent magnet synchronous motor, and selecting key design variables; Step S2: conducting orthogonal experimental design on the key design variables based on the Taguchi method, and using finite element simulation to obtain the motor efficiency, average torque, and torque ripple coefficient under different parameter combinations; Step S3: refining the rotor structure based on the motor basic design established by the optimal parameter combination; Step S4: performing mechanical strength verification at the highest operating speed and thermal performance verification under rated operating conditions; Step S5: generating an efficiency characteristic spectrum of the motor within the full operating range and outputting manufacturing drawings. This application, through this method, ensures that the motor achieves a comprehensive performance of high efficiency and low vibration and noise while meeting strict dimensional constraints.

This application provides a method for optimizing resonance and torque pulsation in an electric vehicle prime mover, comprising: S2, inputting real-time dynamic fluctuation generation indicators into a preset finite element analysis model to simulate the resonance frequency drift trend and calculate potential torque pulsation anomalies; S4, using acquired information on the uneven distribution of the electromagnetic field, combined with real-time sensing state data to generate a vicious cycle formation risk assessment score; S6, updating the torque control model by stabilizing the resonance frequency parameters to optimize the torque output curve to suppress pulsation anomalies; S7, after obtaining the optimized torque output curve, inputting a feedback loop mechanism to verify the material physical property response and determine whether the source of dynamic fluctuations has been eliminated; S8, if it is determined that the source of dynamic fluctuations has been eliminated, recording the adjustment log and updating the temperature load change database for subsequent simulation use. This invention achieves a significant improvement in the stability and efficiency of prime mover operation.

The present application relates to the technical field of permanent magnet synchronous motor control, and particularly relates to an adaptive method for actively feeding forward and compensating cogging torque of super-multipole permanent magnet synchronous motor, which is as follows: a cogging torque feedforward compensation model is established, and the amplitude-phase nonlinear parameters are converted into linear weight coefficient form through triangular orthogonal decomposition; secondly, the AC component of the q-axis voltage output by the current PI regulator is extracted as a compensation residual error signal, the weight coefficient is updated on-line and iteratively using the normalized least mean square algorithm, and adaptive tracking of the cogging torque change caused by temperature drift and mechanical wear is realized; finally, combined with a dual-redundant position feedback system, a double-channel independent weight coefficient maintenance, cross-checking and seamless fault switching mechanism is established. The present application can reduce torque ripple under low-speed working conditions, improve the low-speed stability and control accuracy of super-multipole permanent magnet synchronous motor, and meet the functional safety requirements of aviation-grade electric drive systems.

The present disclosure relates to a stator assembly of an axial motor, an axial flux motor and a vehicle, the stator assembly comprising a stator core, coil windings and pole shoe pieces, the stator core comprising stator blocks, the stator blocks being provided with the coil windings, at least a part of the pole shoe pieces being connected with side surfaces of the stator blocks in a circumferential direction of the stator assembly. The stator assembly can weaken the influence of the spacing between adjacent stator blocks by the provided pole shoe pieces, reduce cogging torque and torque ripple, and reduce alternating current loss.

The application provides a multi-layer irregular permanent magnet and electromagnetic composite excitation motor, and belongs to the technical field of motor and electric appliance of electric vehicles. Electric excitation windings are wound on T-shaped salient poles, permanent magnet steel is embedded in slots of the transverse part of the T-shaped salient poles of a rotor core, the electric excitation windings and the permanent magnet steel jointly provide an air gap magnetic field, the magnetic field strength is large, the power density is high, the magnetic field is adjustable, the combined permanent magnet poles on the rotor core are composed of embedded permanent magnet steel and a magnetic separation air gap for preventing magnetic leakage, adjacent combined poles are not symmetrical to each other, the magnetic field direction of the poles is constrained by the corresponding magnetic separation air gap, a plurality of segment magnetic fields form a total magnetic field of each pole, the air gap magnetic density is good in sinusoidal property, the cogging torque is small, the torque ripple is low, the driving motor runs stably, and the output performance is good.

The application provides a rotor core and a motor with the same. The rotor core is formed with a plurality of magnetic poles which are arranged at intervals along the circumference of the rotor core. The outer periphery of the cross section of each magnetic pole comprises a plurality of arc lines and a plurality of straight lines, and the plurality of arc lines and the plurality of straight lines are arranged alternately. The air gap magnetic field between the stator core and the rotor core is optimized, the torque ripple is reduced, the motor demagnetization resistance and the motor efficiency are improved. The stator tooth is opposite to the magnetic pole and comprises a tooth body and a tooth shoe. The tooth shoe comprises two tooth shoes which are arranged at the two radial sides of the tooth body respectively. The tooth body corresponds to the first arc line, and the tooth shoe corresponds to the straight line. The magnetic field in the region between the tooth body and the first arc line is the strongest, the magnetic field in the region between the stator slot and the second arc line is the weakest, and the magnetic field in the region between the tooth shoe and the straight line is in the middle. The position and size of the straight line can be adjusted to adjust the magnetic field in the region. The motor iron loss is greatly reduced, the magnetic steel utilization rate is improved, and the motor harmonic loss is reduced.

The application discloses a kind of aviation matrix motor position signal redundancy detection method and redundancy detection system, belong to motor drive system technical field, when position sensor does not occur failure, the signal containing position information is detected by position sensor, and the signal containing position information is solved, obtains rotor mechanical angular velocity, stator electric angle and rotor electric angle;When position sensor appears failure, the position signal is detected by the method of injecting high-frequency signal in one side winding, and extracting position information in the other side winding;The application realizes the redundancy detection of matrix motor position signal, can reduce the torque ripple of operation after failure, and can only use a set of position observer to simultaneously solve the position information of stator and rotor, reduce the complexity of algorithm.

The application discloses a two-phase eight-vector direct torque control method of a three-phase motor control circuit, which is based on two-phase eight-vectors of the three-phase motor control circuit, voltage vectors are used to divide a complex plane to form multiple sectors zone The electric angles of each sector are different, the flux linkage adjustment instruction and the torque adjustment instruction obtained through a hysteresis adjustment unit, and the sector where the current flux linkage is located are used to set a voltage vector selection table, and appropriate switching signals are selected to control an inverter. Compared with other four-switch three-phase asynchronous motor control methods, the application adopts eight-vector direct torques to control eight vectors, and two additional eight-vector direct torques can well suppress the torque ripple of the motor.

This servo motor control device comprises a torque command correction unit that uses a current to be applied to a three-phase AC motor, and a combination of the phase and the amplitude of a correction amount for cancelling a torque ripple generated when the current is applied to the three-phase AC motor and applies the correction amount to the current, to suppress the generation of a torque ripple.

This invention discloses a harmonic extraction method, system, and application for harmonic current suppression in permanent magnet synchronous motors (PMSMs). The method includes: performing coordinate transformation on the three-phase stator currents of the PMSM acquired in real time to obtain direct-axis and quadrature-axis current components in a synchronous rotating coordinate system; inputting the direct-axis and quadrature-axis current components into an improved SOGI bandpass filter to separate harmonic current components of specific orders; the improved SOGI bandpass filter includes multiple parallel SOGIs to adapt to harmonics of different frequencies; based on the harmonic current components, iteratively determining the optimal harmonic compensation voltage using a gradient descent method; and injecting the harmonic compensation voltage as a feedforward signal into the output of the current loop of the motor control system to suppress the harmonic current of the PMSM. This invention achieves precise suppression of harmonic current in PMSMs, improves motor efficiency, and reduces torque ripple and vibration noise.

This invention relates to a rotor lamination, a rotor assembly, a motor, and a vehicle. The rotor lamination includes a plurality of magnetic pole units arranged circumferentially along the rotor lamination. Each magnetic pole unit includes a first magnetic slot group and a second magnetic slot group. The second magnetic slot group is located radially inside the first magnetic slot group. The first magnetic slot group includes a first main slot suitable for inserting a first magnet, and the second magnetic slot group includes a second main slot suitable for inserting a second magnet. The width of the first main slot is greater than the width of the second main slot. The rotor lamination provided by this invention can simplify the rotor lamination process, reduce costs, while ensuring the average torque of the motor, suppressing torque ripple, and improving motor performance.

The present application belongs to the field of electric traction control, and particularly relates to a high-efficiency electric control method and system for traction motors of new energy electric locomotives, which comprises: operation state parameter acquisition; bus voltage feedforward dynamic compensation; online identification of key parameters of electric machines; multi-target coordinated optimization traction control; active damping injection resonance suppression; fault diagnosis and fault-tolerant control. The method aims to solve the problem of control accuracy decline caused by voltage fluctuation and parameter drift. At the same time, a system is constructed based on the above method, which comprises: an energy management interface unit; a signal conditioning and acquisition subsystem; a main control core processing unit; an isolation driving subsystem; a power conversion module; an energy feedback management unit; a residual life prediction module. By adopting the above technical scheme, the control stability and energy efficiency ratio under complex working conditions are significantly improved, the loss and torque ripple are reduced, and the smoothness and safety of locomotive operation are enhanced.

This invention provides a speed identification method for a three-phase asynchronous motor based on sensorless vector control, comprising: establishing a mathematical model of the three-phase asynchronous motor; determining the parameter matrix to be identified; defining the observation length, neuron factor, and initializing the model reference adaptive covariance matrix P(N); generating the observation matrix and its transpose matrix; calculating the current-time model reference adaptive covariance matrix P(N); using a fuzzy control algorithm to calculate the gain matrix K(N-1) of the previous time step; updating the estimated values ​​of the parameters to be identified; and updating the objective function value J. t (θ). This invention effectively reduces torque ripple, enabling a three-phase asynchronous motor to smoothly transition from low speed to high speed operation. Current ripple is significantly reduced, improving the system control performance of the three-phase asynchronous motor under varying load conditions. The technical solution of this invention addresses the technical problems of high parameter sensitivity and poor disturbance rejection capability in traditional model reference adaptive methods, as well as the difficulty in adjusting the parameters of traditional PID controllers for the speed loop.

This invention discloses a stator assembly, a motor, and a vehicle powertrain, relating to the field of motor technology. The assembly includes a stator core with multiple stator slots spaced apart on its radially inner surface and along its circumferential direction. Multiphase windings are mounted on the stator core, forming 2L+1 layers in each stator slot, where L is a positive integer. Each phase winding includes multiple coils, which are lap-wound coils. The coils are distributed on one side of the stator core (crown side) and the other side (welded side). At least one stator slot contains adjacent layers of coils belonging to different phase windings. The span of the coils on the crown side is less than Z / 2P, and the span of the coils on the welded side is greater than Z / 2P, where Z is the number of stator slots and P is the number of pole pairs. This invention solves the problem in the prior art where stator assemblies struggle to maintain low torque ripple while simultaneously achieving harmonic suppression.

A motor control table generation method for generating a correction table in which current conditions and correction indices are associated with each other in a motor control device including correction command value calculation circuitry configured to calculate a correction command value for suppressing a torque ripple of a motor by using the correction table includes: rotating the motor; performing torque determination to measure a pulsation amount, which is a torque ripple or a physical quantity correlated with the torque ripple the torque ripple including a frequency component equivalent to N times (N is an integer of 1 or more) a fundamental frequency corresponding to an electrical angle of the rotated motor; calculating, for each current condition, a modified correction index for suppressing the pulsation amount, based on a measurement result of the torque determination; and writing the modified correction index into the correction table.

The application discloses a low-inductance motor low-torque ripple control method based on a dual-core function DSP, relates to the technical field of low-inductance motor control, and relies on a main core of the dual-core function DSP and a CLA coprocessor function isolation division architecture, so that the main core only executes low-frequency overall tasks such as system initialization, bus communication and fault protection, the CLA coprocessor independently completes high-frequency operation of the whole motor control process, operation resources are completely isolated, the problem of operation congestion and interruption overflow is avoided from the root, 100kHz high-frequency PWM carrier frequency is determined in combination with the electrical bandwidth characteristics of the motor, the electrical bandwidth of 5k-15kHz of the low-inductance motor is accurately matched, the control signal can track the rapid change of the motor speed and current in real time, the motor driving jitter problem caused by insufficient carrier frequency is solved, and the carrier frequency comprehensively balances the motor control demand and power module loss, so that high-frequency stable control can be realized without additional improvement of chip computing power.

The present invention relates to a rotor, and more particularly, to an asymmetric alternate pole rotor capable of reducing cogging torque and torque ripple. In the asymmetric alternate pole rotor of the present invention, permanent magnets and cores of non-permanent magnets are alternately arranged in a circumferential direction, and the arrangement width of the permanent magnets is made greater than the arrangement width of the cores, i.e., has a high pole arc ratio, by providing such an asymmetric alternate pole type rotor, reduction of no-load back EMF is minimized, by finite element (FEA) analysis, the pole arc ratio of the permanent magnets and the cores is determined at a performance node that minimizes the decrease in magnet usage and the reduction of no-load back EMF, thereby having the effect of maximizing efficiency and performance.

This invention relates to a speed control method and electronic device for permanent magnet synchronous motors (PMSMs) based on singular perturbation theory. The method includes: establishing a singular perturbation model of the PMSM and decoupling it into a fast-changing subsystem and a slow-changing subsystem; constructing an amplitude control set model predictive controller to obtain a voltage amplitude candidate set and establishing a current prediction model; calculating a q-axis current reference value based on a deadbeat controller; constructing a cost function based on the q-axis current reference value; using the cost function and the current prediction model to traverse the voltage amplitude candidate set; selecting the voltage combination with the minimum cost function as the optimal voltage control signal; and driving the PMSM based on the optimal voltage control signal. Compared with existing technologies, this invention has advantages such as improved current tracking accuracy, suppression of harmonics and torque ripple, ensuring rapid tracking of speed commands, and simultaneously meeting the requirements of high dynamics, high precision, and robust control of motor speed.