169 results about "Field weakening" patented technology

The invention relates to the technical field of electric vehicle control, in particular to an electric vehicle control method and system. The method comprises the following steps: acquiring background control terminal authority of the electric power intelligent inspection electric vehicle, extracting motor operation state data and analyzing current fluctuation change to obtain working condition conversion current fluctuation data, then performing equivalent fitting of motor permanent magnet demagnetization intensity, and analyzing a proportional relation between the motor permanent magnet demagnetization intensity and motor output torque loss; designing a motor field weakening control strategy by combining the demagnetization intensity and the output torque loss data, and developing motor control firmware based on the strategy; and finally, the firmware is sent to the electric vehicle control terminal, and the electric vehicle control method is executed. The electric vehicle control technology is optimized, so that the electric vehicle control technology is more perfect.

The invention discloses a feedback field weakening control method and system for a surface-mounted permanent magnet synchronous motor, and the method comprises the steps: collecting a rotation speed feedback value of a motor, and controlling the operation of the motor through employing a maximum torque current ratio if the rotation speed feedback value is smaller than a rated rotation speed; calculating a first flux-weakening rotating speed according to the real-time load rate and the bus voltage fluctuation, and if a rotating speed feedback value of the motor is greater than the first flux-weakening rotating speed, entering a first flux-weakening mode: calculating a difference value between an output voltage amplitude and the bus voltage, generating a d-axis current compensation value, and performing load compensation and rotating speed compensation on the d-axis current compensation value to obtain a d-axis current given value; the maximum value of the q-axis current is calculated, given voltage values of the d-axis and the q-axis are generated, and the motor is driven to operate; and calculating a second flux-weakening rotating speed according to the q-axis current maximum value and the voltage margin, and if the rotating speed feedback value of the motor is greater than the second flux-weakening rotating speed, entering a second flux-weakening mode: further limiting the q-axis current maximum value through a current limit circle and a voltage limit circle on the basis of the first flux-weakening mode.

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 large-scale wind turbine group power control method and system under a full-wind-domain working condition. The method comprises the steps that wind power plant parameters and wind turbine generator set parameters under the full-wind-domain working condition are collected; according to the parameters, establishing a wind power utilization evaluation coefficient linearization model, a wind turbine generator kinetic energy storage evaluation coefficient linearization model and a converter operation risk evaluation coefficient linearization model; constructing a whole-wind-domain wind power plant power controller based on each linearization model: in a low-wind-speed interval, optimizing the output power of a wind turbine generator to improve the wind energy capture efficiency and reduce the terminal voltage fluctuation; and in a high wind speed interval, the terminal voltage deviation and the operation risk coefficient of the converter are reduced by optimizing the output power and the flux weakening current of the wind turbine generator. The method can effectively improve the wind energy capturing capability in a low-wind-speed interval, reduce the terminal voltage deviation and the converter operation risk coefficient in a high-wind-speed interval, guarantee the operation stability of the whole-wind-domain wind power plant, and achieve the optimal power control of the whole-wind-domain wind power plant.

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 relates to a permanent magnet synchronous motor online temperature compensation MTPV control method considering stator resistance, and belongs to the technical field of permanent magnet synchronous motor control. Aiming at the problems of misalignment of a voltage elliptic model caused by neglect of stator resistance in the existing field weakening control and reduction of control precision due to parameter offset caused by temperature rise, the invention provides the following scheme: constructing a voltage elliptic equation considering the stator resistance, and establishing a temperature change model of the stator resistance, inductance and permanent magnet flux linkage; and solving MTPV current tracks at different temperatures in an off-line manner by adopting a Newton downhill iteration method, and dynamically correcting a current instruction through on-line temperature compensation. According to the method, resistance drop compensation and a parameter temperature change self-adaptive mechanism are fused, the problems of voltage ellipse offset and trajectory planning distortion under high-speed and large-load conditions are solved, the high-temperature demagnetization risk of the permanent magnet is suppressed, high-precision torque control over the quadruple speed or above in a wide temperature range is achieved, the current instruction error is reduced by 60% or above, and the torque control precision is improved. And the stability and the speed regulation performance of the motor system of the electric vehicle are obviously improved.

The invention discloses a rotating speed loop control method for stable magnetic adjustment of a magnetic flux adjustable permanent magnet synchronous motor, belongs to the field of motor control, and aims to solve the problem that reluctance torque changes drastically during online magnetic adjustment of the magnetic flux adjustable permanent magnet synchronous motor. The method comprises the following steps of: 1, training a neural network model by taking an inductance parameter and a permanent magnet flux linkage which change along with a magnetization state and a direct-axis current as a data set; step 2, obtaining motor quadrature-direct axis current according to the collected stator current and rotor position information, and obtaining prediction values of motor inductance parameters and permanent magnet flux linkage through the trained model; 3, inputting the motor quadrature-direct axis current, the inductance parameter prediction value and the permanent magnet flux linkage prediction value into a torque-current gain adjuster to obtain a reluctance torque corresponding component prediction value and an adjusted torque-current gain; 4, obtaining a given value of quadrature-axis current, and further obtaining a driving signal of the inverter; and repeating the steps 2-4, and suppressing the torque rotating speed pulsation during the magnetic adjusting period.

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 the technical field of permanent magnet motors, in particular to a double-rotor hybrid excitation magnetic flux switching permanent magnet motor with double-C staggered teeth and magnetic flux leakage control, which comprises an outer rotor, a middle stator and an inner rotor, the middle stator is arranged between the outer rotor and the inner rotor, a plurality of first salient poles are uniformly distributed on the outer rotor, and a plurality of second salient poles are uniformly distributed on the inner rotor. A plurality of second salient poles are uniformly distributed on the inner rotor; the middle stator comprises m double-C staggered tooth type iron cores, m rectangular leakage magnetic iron cores, n tangentially magnetized I-type permanent magnets, an armature winding, a first set of excitation windings and a second set of excitation windings. The advantages of compact structure and high working efficiency of a double-rotor magnetic flux switching permanent magnet motor are reserved, an air-gap magnetic field is smooth and adjustable by adding the electro-magnetic winding, the problem of magnetic field coupling when the inner motor and the outer motor work simultaneously is effectively solved, the speed regulation range when the inner motor and the outer motor work independently is widened to a certain extent, and the service life of the motor is prolonged. Meanwhile, the leakage magnetic iron core is added, so that the problems of strong permanent magnetic potential and difficulty in flux weakening are solved.

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 permanent magnet synchronous motor control method, system and device based on H infinity filter, a medium and a product, and relates to the field of motors, and the method comprises the steps: optimizing the parameters of a permanent magnet synchronous motor at the current moment based on the H infinity filter; the permanent magnet synchronous motor parameters comprise stator resistance, stator inductance and permanent magnet flux linkage of the permanent magnet synchronous motor; based on the output rotating speed and the reference rotating speed of the permanent magnet synchronous motor at the current moment, a PI controller is adopted to determine reference stator current; based on the reference stator current, weak magnetic control is adopted to generate a stator current component; based on the stator current component and the optimized parameters of the permanent magnet synchronous motor, a mathematical model of the permanent magnet synchronous motor is adopted to calculate a reference stator voltage component; and converting the reference stator voltage component into a switching pulse of an inverter through space vector pulse width modulation so as to drive the permanent magnet synchronous motor. According to the invention, the control precision and robustness of the permanent magnet synchronous motor can be improved.

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 invention discloses a permanent magnet synchronous motor control method and device, a permanent magnet synchronous motor and a storage medium, and belongs to the technical field of motor control. The speed error value is determined according to the electric angular speed and the instruction speed of the permanent magnet synchronous motor; calculating a reference voltage adjustment value of a weak magnetic module according to the speed error value; and determining a weak magnetic module reference voltage according to the weak magnetic module reference voltage adjustment value, and performing weak magnetic control of the permanent magnet synchronous motor according to the weak magnetic module reference voltage. Through the mode, the reference voltage of the flux weakening module of the permanent magnet synchronous motor is accurately adjusted, the problem that the dynamic anti-disturbance performance of a motor control system is reduced under the high voltage utilization rate can be solved, good dynamic performance and anti-disturbance performance can be obtained in the speed regulation process of the motor, and the control efficiency of the motor is considered.

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.

The present invention discloses a control method, device, motor, storage medium and processor for a motor. The method includes: in the field weakening control system of the motor, a single q-axis current regulator is adopted to freely switch between field weakening traction and braking control under field weakening conditions; in the control system of the single q-axis current regulator, a field weakening compensation module is added to perform field weakening compensation processing on the d-axis and q-axis currents of the motor; and an out-of-control limiting and compensation module is added to perform out-of-control limiting and compensation processing on the field weakening current of the motor to obtain the voltage vector angle of the field weakening control system of the motor; according to the voltage vector angle and the maximum stator voltage of the motor, the dq-axis reference voltage vector of the motor is determined to drive and control the system where the motor is located. With this solution, by adopting a single current loop control structure in the field weakening control of a permanent magnet synchronous motor and using a limiting method and a current compensation method for field weakening control, the stability of the control system of the permanent magnet synchronous motor can be improved.

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.

A permanent magnet hub asymmetric V-shaped built-in outer rotor motor relates to the technical field of motors, the motor comprises an inner stator and an outer rotor, a plurality of permanent magnet units are built in the outer rotor, and the permanent magnet units are symmetrically arranged around a rotating shaft of the outer rotor, and is characterized in that each permanent magnet unit comprises a V-shaped magnetic steel group; the V-shaped magnetic steel group is composed of two pieces of linear magnetic steel which are symmetrically arranged relative to the d axis, and in the V-shaped magnetic steel group, the width of the linear magnetic steel located on the anticlockwise side of the d axis is a, the width of the linear magnetic steel located on the clockwise side of the d axis is b, and then egt exists; b. The motor provided by the invention is good in flux weakening speed expansion capability.

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.