129 results about "Field weakening" patented technology

The invention relates to an FOC control method based on an automobile air conditioner module motor without a Hall sensor, and belongs to the technical field of automobile electronics. The method comprises the following steps: injecting double-frequency voltage pulses into a stator in stages to position a rotor; collecting current through a sampling resistor and filtering to construct a rotor flux linkage distribution model, and presetting rectangular axis current in combination with noise reduction of a miniature acoustic sensor and air speed gear of an air conditioner; an extended Kalman filter observer is adopted to reversely deduce the load torque, and the torque change rate is monitored to trigger instantaneous load impact protection; the voltage space vector amplitude is corrected through voltage feed-forward compensation, a resistor-capacitor series filter circuit is additionally arranged, and phase dislocation pulse width modulation is adopted for resisting interference; and establishing a motor efficiency-rotating speed-load three-dimensional optimization method, starting dynamic flux-weakening control, and estimating the winding temperature through the stator resistance to adjust the flux-weakening depth. Accurate starting and dynamic load adaptation of the Hall-sensor-free motor are achieved, starting out-of-step and noise exceeding are avoided, and stable air volume of an automobile air conditioner and long-term reliable operation of the motor are guaranteed.

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

The invention discloses a flux weakening method of a permanent magnet synchronous motor finite control set model prediction control system based on an expected fundamental wave voltage closed loop, and belongs to the technical field of permanent magnet synchronous motor speed regulation control. According to the method, the problems of voltage saturation and poor robustness of a finite control set model prediction control system in a weak magnetic region are solved. According to the method, one-step delay compensation is carried out on the stator current, the stator current predicted value predicted through delay compensation is substituted into the voltage vector model under current vector dead beat control, and the compensated voltage vector reference value can be calculated. And an expected fundamental wave voltage vector is calculated based on the compensated voltage vector reference value, and finally the expected fundamental wave voltage vector is used as feedback of closed-loop flux-weakening control, so that maximum voltage control can be realized, and voltage saturation of a flux-weakening area is avoided. The method provided by the invention has better current dynamic performance, faster acceleration time and better robustness. The method can be applied to field weakening control of the permanent magnet synchronous motor.

The invention discloses a vehicle parking control method and device based on an induction motor and a vehicle. The method comprises the steps that after an accelerator of the vehicle is released, whether a motor meets a preset condition or not is judged; if the motor meets the preset condition, the feedback rotating speed of the motor is controlled to be zero, and the output of the weak magnetic regulator is closed, otherwise, the target rotating speed of the motor is reduced according to the preset deceleration, and the feedback rotating speed of the motor is controlled to be the actual rotating speed of the motor; determining a first output value of a rotating speed control strategy according to the target rotating speed and the feedback rotating speed; determining a second output value of the first current control strategy according to the first output value; and determining a fourth output value of the second current control strategy according to the first output value and a third output value of the weak magnetic regulator, controlling the motor to operate according to the second output value and the fourth output value, and returning to execute the step of judging whether the motor meets the preset condition. According to the technical scheme, vehicle parking can be well controlled.

The invention discloses a motor multi-parameter online identification and robust control method based on multi-observer cascade. The method comprises the steps of obtaining real-time operation data of the permanent magnet synchronous motor; obtaining a preliminary observation value through a sliding mode observer group; the sliding-mode observer group is constructed based on a mathematical model of the permanent magnet synchronous motor and is used for receiving real-time operation data and synchronously outputting initial observation values of a permanent magnet flux linkage, q-axis inductance and d-axis inductance; then analyzing the preliminary observation value to obtain a flux linkage accurate value, a q-axis inductance accurate value and a d-axis inductance accurate value, and finally performing adaptive control on the permanent magnet synchronous motor according to the flux linkage accurate value, the q-axis inductance accurate value and the d-axis inductance accurate value. According to the method, multiple motor parameters can be synchronously estimated, the limitation that other parameters are assumed to be accurate when a single parameter is identified in a traditional identification method is avoided, adaptive current reference and voltage decoupling are further generated based on the estimated parameters, and robust and stable field weakening control under variable working conditions can be achieved.

The invention relates to a low-harmonic permanent magnet synchronous motor rotor punching sheet and a motor rotor, and relates to the technical field of permanent magnet synchronous motors. According to the scheme, the rotor punching sheet is provided with the first magnetic steel groove and the second magnetic steel groove which form a V shape and are symmetrical about the D axis of the motor rotor, and the opening of the V shape faces the outer circumferential wall of the rotor punching sheet body. According to the structure, the distribution of a motor rotor magnetic field is improved, the magnetic field is more uniform, the salient pole rate is higher, the weak magnetic speed expansion capability is stronger, the structural strength is better, the harmonic content is lower, and the sine property of the magnetic field can be improved. On the outer circumferential wall of the rotor punching sheet body, a first auxiliary groove is formed between the first magnetic isolation bridge and the second magnetic isolation bridge and close to the first magnetic isolation bridge, and a second auxiliary groove is formed between the second magnetic isolation bridge and the D shaft and close to the second magnetic isolation bridge. On the premise of ensuring the mechanical strength of the magnetic isolation bridge, the magnetic line direction is changed, the magnetic leakage is reduced, the air gap flux density waveform is improved, the harmonic content is reduced, and the torque ripple and electromagnetic noise are reduced.

The invention discloses a permanent magnet synchronous motor wide speed range model prediction control method and system based on a mean value reduction optimization algorithm, and belongs to the technical field of motor control. According to the method, a discrete mathematical model of the permanent magnet synchronous motor is established under a d-q rotating coordinate system, a q-axis current reference value is generated by an outer ring through a speed PI regulator, and a d-axis current reference value is calculated in combination with a maximum torque per ampere (MTPA) principle and a weak magnetic region voltage constraint; finite control set model prediction control is adopted in an inner ring, enumeration prediction is conducted on candidate voltage vectors of the three-phase voltage source type inverter, a cost function containing a d-axis current error, a q-axis current error and an electromagnetic torque error is constructed, an optimal voltage vector is selected, and a three-phase PWM signal is generated through space vector pulse width modulation to drive a motor. The system is provided with a mean value reduction optimization module, joint optimization is carried out on speed outer ring PI parameters and cost function weight coefficients in the off-line stage, the parameters are stored in a lookup table, and automatic setting of control parameters is achieved. The permanent magnet synchronous motor can improve the dynamic response performance of the rotating speed and the current in the base speed area and the weak magnetic area, reduce the total harmonic distortion of the stator current, improve the voltage utilization rate and the overall operation efficiency of the permanent magnet synchronous motor, and is suitable for occasions such as electric vehicle driving and high-performance servo systems.

The invention provides a rotor assembly and a servo motor. The rotor assembly comprises a rotor iron core, permanent magnets and an irradiation light source, the multiple permanent magnets are arranged at intervals in the circumferential direction of the rotor iron core, the rotor iron core is provided with a magnetic isolation gap and an installation groove which are communicated with each other, the installation groove penetrates through at least one end of the rotor iron core in the axial direction, and the magnetic isolation gap is formed between every two adjacent permanent magnets in the radial direction; the installation groove is internally provided with a photosensitive telescopic piece, one end, close to the central axis of the rotor core, of the photosensitive telescopic piece is fixedly connected with the groove wall of the installation groove, and one end, far away from the central axis of the rotor core, of the photosensitive telescopic piece is fixedly connected with the magnetic conduction slip sheet. The irradiation light source is used for irradiating the photosensitive telescopic piece to adjust the telescopic length of the photosensitive telescopic piece. According to the rotor assembly and the servo motor, accurate field weakening control can be achieved, and the rotating speed range of the servo motor is widened.

The application provides a Park compensation method, device, medium and system of a permanent magnet synchronous motor. The method comprises: adjusting the permanent magnet synchronous motor to a positive rotation speed by using a dynamometer, taking a first preset rotation speed as an interval point, until the highest positive rotation speed, applying a field weakening current to the d-axis of the permanent magnet synchronous motor, obtaining a plurality of first initial angle calibration values respectively, and determining a Park compensation value according to all the first initial angle calibration values; obtaining a plurality of second initial angle calibration values respectively, and determining an angle correction value; determining a Park compensation radian value as a sum value of a compensation value product and an angle correction; and adjusting the rotor position of the permanent magnet synchronous motor by using the Park compensation radian value. Thus, the problem that the torque accuracy of the motor is low due to the angle compensation strategy of the existing scheme is solved.

The invention discloses a quadratic programming-based permanent magnet synchronous motor model prediction field weakening control method and system. The method comprises the following steps of: giving a rotating speed reference value of a current motor, calculating a reference rotating speed of the motor, making a difference between the rotating speed reference value and the reference rotating speed, and obtaining a direct-axis current reference value according to a difference value relationship; according to the current value, the voltage value and the rotating speed value at the current moment, the current value and the rotating speed value at the next moment are calculated, and a current cross term is ignored in the calculation process; establishing a target function of a voltage instruction by combining the current value of the next moment, the rotating speed value of the next moment, the direct-axis current reference value and the rotating speed reference value; the objective function of the voltage instruction is converted into a quadratic optimization problem model with constraints, solving is carried out through a Karush-Kuhn-Tucker optimality condition, and an optimal voltage instruction is obtained; the optimal voltage instruction serves as reference quadrature-axis voltage and reference direct-axis voltage, and a duty ratio control signal used for controlling three-phase output is obtained through calculation; according to the invention, the dynamic response capability, the energy efficiency and the system stability of a weak magnetic region can be improved, and the urgent demand of a modern electric drive system for high-performance control is met.

The application discloses a motor control method, a controller, a motor, a refrigerator, a medium and a program product. A direct-current bus voltage and a cross-axis current of a motor are acquired, and a direct-axis voltage and a cross-axis voltage are acquired. An initial direct-axis current is generated through field weakening control according to the direct-axis voltage, the cross-axis voltage and the direct-current bus voltage. A target frequency disturbance component caused by direct-current bus voltage fluctuation and a direct-current component used for field weakening control are separated from the initial direct-axis current. A phase of the target frequency disturbance component is calculated and optimized to obtain a target alternating current component, with minimization of a harmonic component of the target frequency in the cross-axis current as an optimization target. A direct-axis reference current is synthesized according to the target alternating current component and the direct-current component, and the motor is controlled according to the direct-axis reference current. In the working condition of the direct-current bus voltage fluctuation, energy backflow can be effectively inhibited, current harmonics can be reduced, torque pulsation can be reduced, and the running stability of the motor can be improved.

A vector control method is disclosed in which currents of an electric multiphase machine (183) are represented in a dq-axis coordinate system, comprising the vector control method of injecting a d-axis current based on a q-axis request (140). Furthermore, a corresponding converter and a computer program product are disclosed.

The application relates to a single-current field-weakening trajectory control method for a permanent magnet synchronous motor of an electric vehicle, and belongs to the field of field-weakening control technology of the permanent magnet synchronous motor of the electric vehicle. The method solves the problems of the complicated double-current field-weakening control method and the incapability of deep field weakening in the prior art. The method comprises the following steps: collecting the mechanical angular velocity and the load torque of the permanent magnet synchronous motor in real time; when the mechanical angular velocity is within the base speed range, controlling the direct and quadrature axis currents of the permanent magnet synchronous motor to run on a first trajectory; when the mechanical angular velocity exceeds the base speed range, controlling the permanent magnet synchronous motor through single-current control; when the load torque is not increased, controlling the direct and quadrature axis currents to run on a second trajectory; when the direct and quadrature axis currents of the permanent magnet synchronous motor run on the second trajectory and the load torque is increased, controlling the direct and quadrature axis currents to run on a third trajectory; and when the load torque of the motor is stable, controlling the direct and quadrature axis currents to run on a fourth trajectory. The single-current field-weakening trajectory control of the permanent magnet synchronous motor of the electric vehicle is realized.

A system and a method operate in a first mode and a second mode. In the first mode, the system and the method control the DC current and quadrature current applied to a motor with an internal permanent magnet to achieve a desired speed and torque over a range of internal operating temperatures of the motor without exceeding a maximum stator current. If a calculated stator current exceeds a maximum stator current, the system and the method operate in the second mode, in which they control the DC current and the stator current to keep the calculated stator current below the maximum stator current.

The invention discloses a simulation modeling method and device for a permanent magnet synchronous motor. The simulation modeling method comprises the following steps: establishing a state equation of the permanent magnet synchronous motor; searching in a preformed first two-dimensional array by taking the stator current as an input quantity to obtain corresponding stator inductance; calculating a stator flux linkage differential value according to a state equation of the permanent magnet synchronous motor and the found stator inductance; integrating the stator flux linkage differential value to obtain a stator flux linkage; and obtaining the adjusted stator current according to the obtained stator flux linkage and the relational expression between the flux linkage and the current. According to the application, the MTPA function can be realized, the values of the inductance and the flux linkage are reduced along with the increase of the current, the MTPA state and the weak magnetic state working area of the real motor can be simulated, and the simulation motor is ensured to be close to the operation condition of the actual motor to the greatest extent.

The invention discloses a field weakening trajectory tracking control method for permanent magnet synchronous motors based on enhanced model predictive current control, comprising: S1, establishing a mathematical model of the permanent magnet synchronous motor in a synchronous rotating coordinate system and determining the optimal operating trajectory in the field weakening region; S2, constructing an extended virtual voltage vector set synthesized from the basic voltage vector, and constructing a virtual voltage vector containing continuous components, excess components, and disturbance components as feedback quantities, which are adjusted by the field weakening current controller. d The shaft reference current limits the virtual voltage amplitude within the inverter output voltage limit; S3, a nonlinear extended state observer based on a nonlinear function is designed to estimate the current state and total disturbance in real time, and correct the current prediction model. The optimal voltage vector is selected through a cost function, and a switching pulse sequence is generated to drive the inverter. This invention can effectively reduce current ripple when motor parameters are mismatched and overcome the deviation of the field weakening trajectory when model parameters are mismatched.

This invention discloses an air conditioner and its compressor control method and device. The control method includes: when the compressor is in a field weakening control mode, acquiring the current three-phase current of the compressor; acquiring the current d-axis voltage and current q-axis voltage based on the current three-phase current; processing the current d-axis voltage and current q-axis voltage to obtain a processed voltage signal; multiplying the processed voltage signal by the reciprocal of an adjustment coefficient, and determining the product as a current adjustment bus voltage command; performing power factor correction control based on the current adjustment bus voltage command; further acquiring the current feedback modulation rate for field weakening control, limiting the current feedback modulation rate to obtain a current processed feedback modulation rate; determining the current field weakening control current based on the current processed feedback modulation rate; and executing field weakening control based on the current field weakening control current. Using this invention, the performance of the compressor in different control processes can be improved.

The application provides a motor field weakening control method and system based on limited set model predictive control, can solve the problem that the output voltage of limited control set model predictive control cannot be directly used for closed-loop field weakening control, and comprises the following steps: obtaining operation parameters of a current sampling period of a motor, and predicting dq axis currents of a next sampling period; constructing a reference voltage of the next sampling period, the reference voltage is divided into a sampling voltage component and a transient voltage component, performing boundary judgment on a reference current vector corresponding to the transient voltage component, and determining whether to perform dynamic amplitude limiting processing on the transient voltage component according to a boundary judgment result; adding the sampling voltage component and the processed transient voltage component to obtain a corrected reference voltage, then obtaining a field weakening current component through comparison and closed-loop feedback, superimposing the field weakening current component to obtain a corrected d-axis reference current, and updating the reference current; and obtaining an optimal voltage vector through an evaluation function of limited set model predictive control to perform control.

The invention relates to a method for controlling an electric motor, wherein the method, at least in one field weakening mode, compares a torque request with an actual torque and, based on this, generates a controller output variable which serves to obtain motor control variables by means of which the motor is controlled, and wherein motor operating variables are measured and used to calculate the actual torque. The invention further relates to an associated control device and an associated motor arrangement.

The invention provides a frequency conversion equipment control method, frequency conversion equipment and a computer readable storage medium. The frequency conversion equipment control method comprises the following steps: in response to a field weakening control instruction, determining a field weakening control parameter interval of field weakening control parameters corresponding to a current state; determining a current target parameter based on the field weakening control parameter interval and a preset abnormal parameter interval; the preset abnormal parameter interval comprises abnormal parameters corresponding to noise; and controlling the frequency conversion equipment based on the current target parameter. According to the control method of the frequency conversion equipment, when field weakening control is carried out, the current target parameter is determined based on the field weakening control parameter interval and the preset abnormal parameter interval, and due to the fact that the preset abnormal parameter interval comprises the abnormal parameters corresponding to the noise, the abnormal parameters can be removed when the current target parameter is determined; therefore, the noise of frequency conversion equipment in field weakening control is reduced, and the equipment reliability is improved.

This invention discloses a control method, control device, and air conditioner compressor. The control method includes: acquiring the current three-phase current and current bus voltage of the compressor; acquiring a current adjustment bus voltage command based on the current three-phase current; acquiring a current feedback modulation rate based on the current bus voltage; determining the current feedback modulation rate deviation to be 0 when the current feedback modulation rate is greater than the modulation rate setting and the current adjustment bus voltage command is less than the maximum limit value of the voltage command; otherwise, determining the current feedback modulation rate deviation to be the difference between the modulation rate setting and the current feedback modulation rate; determining a current field weakening control current based on the current feedback modulation rate deviation; performing field weakening control based on the current field weakening control current; and performing power factor correction control based on the current adjustment bus voltage command. Using this invention, the performance of the compressor in different control processes can be improved.

The application discloses a kind of MTPA-weak magnetic feedforward control method, system based on model parameter updating, storeable medium, it is related to motor control field.The present application includes two stages: MTPA stage control and weak magnetic stage control respectively.Specifically, on the basis of MTPA control, judge whether current point is in the overlapping region of voltage limit circle and current limit circle, if meet then continue to execute MTPA mode, if not meet then jump to weak magnetic region control, according to the interrelation of target torque and voltage limit region, current limit region, real-time solution updates the current operating point of weak magnetic area.In the present application, the smoothness of two-stage transition and the responsiveness of the system under varying conditions are improved.In the case of inductance parameter variation, the present application can update the current operating point based on inductance variation in real time, effectively suppress the working condition fluctuation, and show good application prospect.

The invention relates to a system (1) for controlling the operation of an electric motor intended for powering a motor vehicle, comprising a field weakening controller (2) which, during operation, controls the stator flux to achieve field weakening, wherein a loss controller (3) is provided which is configured to control the power loss from a target loss and an actual power loss, the loss controller (3) being configured such that the stator flux is used as the control variable. The invention also relates to a synchronous machine with such a system (1) and a motor vehicle drive with such a synchronous machine. Furthermore, the invention relates to a method for operating an electric motor drive in a motor vehicle, comprising the system (1) according to the invention, which is operated in such a way as to achieve a target power loss.

The application discloses a kind of global control method, device and permanent magnet synchronous motor of permanent magnet synchronous motor, by calibration, the three-dimensional current pulse spectrum of non-field weakening area is obtained, and the three-dimensional current pulse spectrum of field weakening area is also obtained by calculation, wherein, three-dimensional current pulse spectrum is voltage-speed-torque three-dimensional current pulse spectrum, in the first working condition, according to the three-dimensional current pulse spectrum of non-field weakening area, maximum torque current ratio control strategy is used, in the second working condition, according to the three-dimensional current pulse spectrum of field weakening area, maximum torque voltage ratio control strategy is used, on the one hand, non-field weakening area uses the method of calibration to obtain three-dimensional current pulse spectrum, field weakening area obtains three-dimensional current pulse spectrum by calculation, while reducing calibration time, reduce calibration cost, can make the current MAP more accurate, on the other hand, different control strategies are used for different working conditions, reduce the mutual coupling influence of field weakening ring and current ring, greatly improve the reliability and stability of field weakening control.

A motor device prevents electrolytic corrosion of a bearing. The motor device is mounted on a vehicle and has a stator installed in a housing and provided with a concentrated winding coil, a rotor housed in the center of the stator and provided with a permanent magnet, a bearing installed in the housing and supporting a rotating shaft of the rotor, an inverter provided between the stator and a power storage body and controlling an energization state of the concentrated winding coil, and an energization control section that outputs a control signal to the inverter and executes field weakening control that generates a magnetic flux of the concentrated winding coil in a direction to weaken a magnetic flux of the permanent magnet. The energization control section executes the field weakening control to make a potential difference between the housing and the rotating shaft, i.e., shaft voltage Va1, lower than a withstand voltage Vb1 of the bearing when a motor revolution number Nm is greater than a threshold value Nx.

The application discloses a motor control method, device and system, a motor and an electrical equipment, and belongs to the field of motor control. When a motor enters a field weakening control state, a bus voltage of a frequency converter for controlling the motor is acquired. If a bus voltage drop value in a unit time is detected to exceed a preset voltage value, it is indicated that the bus voltage drops too fast. At this time, if the frequency is directly reduced, the frequency reduction speed is relatively slow, the operating current increases too fast, overcurrent protection is triggered, and the system is shut down. Therefore, the application scheme first increases the carrier frequency of the frequency converter to a preset carrier frequency, and then switches an integral term in a control parameter of the motor to a value corresponding to the preset carrier frequency. In this way, when the frequency is reduced, the frequency reduction speed of the motor can be accelerated, the operating current is prevented from increasing too fast, overcurrent protection is not triggered in the process in which the motor reduces the frequency and exits the field weakening control state, and normal operation of the system is ensured.

This invention provides a dual-layer hybrid structure hybrid magnetic flux-modulated motor, relating to the field of motor design and manufacturing technology. It includes a stator and a rotor disposed inside the stator and rotating relative to it. The stator has an armature winding, and an air gap exists between the rotor and stator. Multiple magnetic pole assemblies are evenly distributed circumferentially inside the rotor. Each magnetic pole assembly includes a first permanent magnet layer and a second permanent magnet layer. The first permanent magnet layer includes a first high-coercivity permanent magnet, and the second permanent magnet layer includes a second high-coercivity permanent magnet and a low-coercivity permanent magnet. The first high-coercivity permanent magnet and the low-coercivity permanent magnet in the second permanent magnet layer form a series structure, while the second high-coercivity permanent magnet and the low-coercivity permanent magnet form a parallel magnetic circuit structure. This invention organically combines "controllable leakage flux" and "memory magnetic flux modulation" through a dual-layer hybrid magnetic circuit structure, enabling the motor to simultaneously possess torque output capability under high load conditions and field weakening speed-enhancing capability under high speed conditions.

The application relates to the technical field of vehicles, in particular to an automatic testing method and device of an electric drive assembly, a vehicle and a storage medium, wherein the method comprises the following steps: receiving an automatic testing instruction of the electric drive assembly, and determining an automatic testing strategy of the electric drive assembly, wherein the automatic testing strategy comprises an MTPA automatic testing strategy and a field weakening automatic testing strategy; the electric drive assembly is automatically tested according to the MTPA automatic testing strategy and the field weakening automatic testing strategy respectively, MTPA automatic testing results and field weakening testing results are obtained, and finally, automatic testing results of the electric drive assembly are generated. Therefore, the problems of low efficiency, high cost and errors in manual performance parameter calibration of the electric drive assembly are solved, and the automatic performance parameter calibration of the electric drive assembly is realized through MTPA testing and field weakening testing.

The invention provides an asynchronous motor field weakening control method and system, a storage medium and a program product, and relates to the technical field of motor control. The given q-axis voltage directly related to the motor torque serves as the feedback quantity of closed-loop control, so that a control system can accurately judge whether the motor is in a high-speed light-load state or not. In the case of light load, the given q-axis voltage is inevitably far lower than the q-axis voltage upper limit set by the system, so that the voltage regulator is prompted to actively exit the saturation region, and the problem that a large number of harmonic waves are generated due to continuous saturation in related technologies is solved. Meanwhile, the basic flux-weakening current generated by the speed inverse ratio model is reserved to serve as a feed-forward item, the dynamic response of the system is guaranteed, dynamic amplitude limiting is conducted on the output of the closed-loop regulator through the feed-forward item, regulation overshoot and oscillation in the dynamic process are prevented, and the response speed and operation stability of flux-weakening control are improved.

The invention provides a motor active flux weakening method and device, and relates to the technical field of motors. The method comprises the following steps: if a target instruction is received, determining a target direct-axis current and a target quadrature-axis current of a motor based on a target torque; the target instruction is an instruction for outputting a target torque; determining a target voltage module value based on the target direct-axis current and the target quadrature-axis current; obtaining a target quadrature-axis current error; the target quadrature-axis current error is a deviation value between the target quadrature-axis current and the actual quadrature-axis current, and the target quadrature-axis current error is used for determining a self-adaptive parameter of the active flux weakening module; inputting the target voltage module value and the target quadrature-axis current error into an active flux-weakening module, and adjusting the output torque of the motor based on the active flux-weakening module; the deviation between the output torque and the target torque is within a preset range. According to the motor active flux weakening method and device provided by the invention, the large torque output requirement can be quickly and stably responded.