507 results about "Electromagnetic torque" patented technology

The invention discloses a low-rigidity heavy-load permanent magnet synchronous motor flexible system structure resonance suppression method, and relates to the technical field of permanent magnet synchronous motor control, and the method comprises the steps: carrying out the dynamic filtering of an input position signal through setting a TD tracking differentiator, and generating a smooth planning instruction and a differential signal thereof; based on the planned instruction differential signal, a speed feed-forward control method is adopted to introduce feed-forward compensation in a position closed loop; constructing a disturbance observer according to the electromagnetic torque equation of the motor, estimating the actual wheelbase of the system in real time, and performing disturbance compensation; based on system resonance characteristics, an IP control method is adopted to perform pole assignment, and proportional gain and integral gain are set to suppress structure resonance and optimize closed-loop response. According to the method, a relatively good resonance suppression effect can be achieved without displacement, speed or acceleration signals of a load end and information such as very accurate load resonant frequency, relatively good dynamic response is achieved, and the requirement on hardware is reduced.

The invention discloses an electro-magnetic doubly salient motor torque ripple suppression method based on harmonic double closed-loop control, and the method comprises the steps: constructing the harmonic double closed-loop control of a torque ripple outer ring and a current harmonic inner ring in an electro-magnetic doubly salient motor current source type drive system of a multiplexing excitation winding; a torque pulsation outer ring observes electromagnetic torque through a model reference adaptive method, pulsation components of the torque pulsation outer ring are extracted in combination with an adaptive notch filter, and a current harmonic inner ring given value is output through closed-loop regulation; the current harmonic inner ring extracts harmonic current by constructing a harmonic space decoupling transformation matrix and combining with a rotating coordinate system of corresponding subharmonics, current harmonics counteracting torque pulsation of the electro-magnetic doubly salient motor are generated through closed-loop adjustment, and the output characteristic of the motor is improved. According to the method provided by the invention, the torque ripple amplitude can be suppressed in a closed-loop manner, the given value of the harmonic current can be automatically adjusted, specific current harmonic injection is realized, the output torque ripple of the electro-magnetic doubly salient motor is eliminated, and the problems that a traditional harmonic injection method is not matched under different operation conditions of the motor and depends on motor parameters are solved.

The invention relates to the technical field of wind driven generator driving control, and discloses a wind driven generator rotor turning-over driving control method based on torque and rotating speed cooperation, which comprises the following steps: before operation, controlling a motor to execute forward and reverse quasi-static micro-motion, and collecting an average electromagnetic torque; pure gravity and friction components are separated by using torque arithmetic sum and difference, gravity model gain is corrected, and friction compensation is configured; a feed-forward torque is calculated in combination with a real-time angle, and friction compensation and speed loop feedback are superposed to generate a current instruction; according to the method, gravity and friction are decoupled through physical symmetry, model parameter errors are eliminated, hidden dangers of integral lag and out-of-control rotating speed when the variable polarity load passes through a dead point are avoided, and stability and safety of the turnover process of the hundred-ton rotor are ensured.

The invention discloses a method and device for restraining shaft system torsional vibration of a net-forming type double-fed fan under the variable wind speed. The method comprises the steps that a mathematical model of the electromagnetic torque-rotating speed difference of the net-forming type double-fed fan is constructed; drawing an electromagnetic torque-rotating speed difference Bode diagram according to the mathematical model; according to the mechanical parameters of the wind turbine and the motor, the shafting natural oscillation frequency of the doubly-fed fan is calculated, and stability analysis is conducted on damping of the shafting natural oscillation frequency in combination with the Bode diagram; drawing a small-signal model block diagram according to the mathematical model; analyzing the small-signal model block diagram to obtain an analysis result that a current loop provides a coupling path for the rotating speed and the active power; according to a stability analysis result and an analysis result of the small-signal model block diagram, negative damping brought by an operation area is weakened by reducing current loop bandwidth, so that the risk of torsional vibration of the shaft system is reduced.

The invention relates to a non-inductive FOC open-loop to closed-loop switching method and device for an electronic water pump and a vehicle. The method comprises the steps that a rotor is pre-positioned; starting an open loop I-F; switching condition judgment; estimating the rotor speed based on an observer, calculating a normalization factor, and obtaining a mixed scale factor through cubic polynomial operation; acquiring an open-loop current instruction of a q axis and a closed-loop current instruction output by a closed-loop speed PI regulator; performing weighted synthesis on the two paths of current instructions according to the mixing scale factor to obtain a temporary target current instruction, and applying a change rate limit to obtain a final current instruction output in the current period; the original angle error of the observer estimation angle and the open-loop slope angle is calculated and normalized, the allowable adjustment step length and direction of the round are dynamically determined, and the angle correction amount of the round is generated and superposed to the open-loop slope angle to update the rotor angle reference value; and closed-loop switching is completed. According to the invention, the problems of electromagnetic torque impact and rotating speed fluctuation caused by instruction step change are solved.

The present invention provides a rotor punching, a rotor core, a rotor, a motor, and a vehicle. The rotor punching is provided with a plurality of mounting slots for mounting permanent magnets. A pole arc region is defined between the portion of any mounting slot adapted for the permanent magnet and the outer periphery of the rotor punching. A magnetic isolation bridge is provided on both sides of any pole arc region along the circumferential direction of the rotor punching. A plurality of through holes are provided in any pole arc region, and the plurality of through holes are distributed at both ends of the pole arc region adjacent to the magnetic isolation bridge. The rotor punching provided by the present invention optimizes the rotor magnetic field distribution by providing through holes at the ends of the magnetic isolation bridges on both sides of the pole arc region, effectively weakening the quadrature-axis armature reaction, significantly improving the motor torque pulsation, and also enhancing the electromagnetic torque of the motor to a certain extent, thereby improving the motor's operating performance.

A motor includes a stator having a winding that when selectively energized produces an electromagnetic field within a rotor cavity, and a rotor disposed within the rotor cavity of the stator and in electromagnetic communication with the winding and the electromagnetic field. The rotor includes a drive shaft, a rotor body that extends around the drive shaft and that defines a plurality of reluctance voids, and magnet inserts that are disposed within the reluctance voids. The magnet inserts occupy at least a portion of a space defined by the reluctance voids. The magnet inserts and the reluctance voids cooperate with the electromagnetic field to produce an electromagnetic torque.

According to the coreless motor provided by the invention, three groups of hollow coil groups are uniformly arranged on the inner circumferential wall of a driving cavity in a surrounding manner, the coils as stator parts do not contain iron cores, and the two ends of the coils are not communicated with each other, that is, each group of coils is electrically independent, so that a three-phase six-wire driving mode is realized. The full-bridge driving structures arranged in the driving cavity are connected to the two ends of each set of coils respectively, each full bridge controls one set of coils, and therefore the current direction and amplitude of each set of windings can be independently adjusted. When the motor is powered on, the hollow coil generates an alternating magnetic field under the action of current, and interacts with a rotatable magnetic driving piece located in the axis direction of the motor to form electromagnetic torque so as to drive the magnetic driving piece to rotate. The magnetic driving part is arranged around the axis and surrounded by the coil, and good magnetic flux coupling and stable rotation output are achieved. And in cooperation with a full-bridge driving structure, three-phase six-wire independent control is supported, the driving freedom degree is higher, the current waveform can be finely adjusted, and high-precision servo control is achieved.

The invention discloses a wind driven generator large-torque transmission chain resistance increasing control method and system, and relates to the technical field of wind driven generator resistance increasing control. The method comprises the steps that operation parameters of a wind driven generator are collected in real time and preprocessed; calculating a rotation fluctuation frequency set and a corresponding amplitude spectrum of the current time window, and tracking and locking the dominant vibration frequency; constructing a fan state space prediction model containing the torsional vibration state of the transmission chain, outputting the predicted variable quantity of the torque of the transmission chain in the next control period, constructing a filter bank based on the dominant vibration frequency, performing filtering compensation on the predicted variable quantity, and generating an electromagnetic torque given value; and performing phase lead compensation on the electromagnetic torque given value, generating a control instruction, sending the control instruction to the wind power converter, and controlling the wind power generator to output the corresponding electromagnetic torque by using the wind power converter. Through systematic multi-link cooperative processing, the vibration suppression effect and the operation stability of the transmission chain can be comprehensively improved.

The present invention relates to a five-degree-of-freedom ultra-high-speed bearingless permanent magnet motor. Both ends of a cylindrical solid permanent magnet are respectively connected to a rotating shaft. A casing is installed outside the cylindrical solid permanent magnet. A stator core is fixedly installed on the casing. A set of torque windings is embedded in the bottom layer of the stator core, and two sets of suspension windings are embedded in the upper layer of the stator core. End covers are fixedly installed on both sides of the casing. Auxiliary bearings are installed between the end covers and the rotating shaft. Passive permanent magnet bearings are nested on both the end covers and the rotating shaft. The present invention is reasonably designed, integrating a magnetic suspension bearing and a permanent magnet motor into one. While the motor generates an electromagnetic torque capable of driving the rotor to rotate, it can also generate a radial suspension force to overcome the rotor gravity and unilateral magnetic pull force, simplifying the motor structure and shortening the axial length of the motor. The double suspension windings and the axial passive permanent magnet magnetic bearing achieve five-degree-of-freedom control, increasing the rotor stiffness and critical speed of the ultra-high-speed motor, and improving the operation stability and anti-disturbance ability.

The invention discloses a wind power plant equivalent virtual inertia identification method based on symbol regression, and relates to the technical field of novel power system frequency safety and stability, and the method comprises the steps: S1, building a doubly-fed fan inertia response dynamic mechanism model containing comprehensive inertia control; according to the method, the problems of lack of physical mechanisms, poor evaluation interpretability and the like of an equivalent virtual inertia evaluation method for a current wind power plant are solved, the method is based on system operation data and is associated with an inertia response dynamic mechanism model, and the interpretability of a system physical process is reserved; a sparse dynamic modeling method is adopted, an input-output linear combination feature library of system electromagnetic torque-rotor rotating speed change is constructed, sparse solution of parameters is achieved through a sequence threshold value least square algorithm, and the equivalent virtual inertia of the wind power plant is obtained through evaluation. According to the method, model priori knowledge and operation data are fully applied, and the evaluation result is high in accuracy and high in interpretability.

The invention relates to the field of permanent magnet synchronous motor control, in particular to an RANF adaptive harmonic suppression method based on dustpan line optimization, which comprises the following steps: S1, establishing a d-q axis control model for a permanent magnet synchronous motor, listing voltage, current and electromagnetic torque equations, giving a harmonic current equation, and adopting an ANF adaptive notch extraction algorithm to obtain a harmonic current control model for the permanent magnet synchronous motor; obtaining estimated values of specific-order harmonic amplitude and phase, and generating harmonic compensation quantity from the estimated values by adopting a PI regulator so as to realize a steady-state indifference-free harmonic suppression effect; and S2, in order to solve the problem that the ANF adaptive harmonic suppression algorithm is difficult to follow the d-q axis current rapidly changing along with the direct current amount, an RANF adaptive harmonic suppression algorithm adopting an R regulator is proposed, the ANF following performance is greatly accelerated, and the practicability of the ANF is improved. When the motor load or the rotating speed changes, quick response can be achieved, system instability is avoided, the dynamic stability of the system is remarkably improved, and the application scene of ANF adaptive harmonic suppression in the permanent magnet synchronous motor is widened.

The invention discloses a BLDC (brushless direct current) driving parameter self-tuning embedded system and method for multiple equipment types, and the method comprises the steps: constructing a BLDC unified mathematical model containing an electromagnetic torque equation, a back electromotive force equation and a mechanical motion equation, and building a nonlinear mapping relation library of motor type identification codes and a key electrical parameter set; a predefined multi-mode excitation signal sequence is injected into the to-be-driven BLDC motor, dynamic response data are synchronously collected, and the dynamic response data are used for representing the characteristics of the key electrical parameter set; based on collected dynamic response data, equivalent inductance and equivalent resistance in a key electrical parameter set are decoupled and extracted through a frequency domain impedance analysis method, and meanwhile, a counter electromotive force coefficient and rotational inertia in the key electrical parameter set are identified by combining time domain counter electromotive force zero crossing point detection with rotating speed differential operation. Based on a motor fingerprint feature library and a fuzzy adaptive architecture, multi-model debugging-free plug-and-play is realized, and stable control performance is maintained under a dynamic working condition.

The invention discloses an LC filtering type permanent magnet motor system prediction flux linkage control method and system and a medium, and belongs to the field of power electronics and power transmission. State variables of an LC filtering type permanent magnet motor system at the k moment are sampled, a discrete state-space equation of the system is established by adopting a zero-order retainer method, and a stator flux linkage vector prediction model is established; obtaining a stator flux linkage vector reference by using the electromagnetic torque reference and the parameters of the permanent magnet motor; constructing a loss function, and solving an inverter optimal control vector reference considering the system voltage constraint; park inverse transformation is referred to for the optimal control vector of the inverter, control pulses are generated through space vector modulation and act on an inverter switching tube, and LC filtering type permanent magnet motor system predictive flux linkage control is completed. According to the method, common control of the torque and the flux linkage can be realized only by controlling the stator flux linkage vector, and excellent torque flux linkage control performance can be obtained without any design parameter.

The invention relates to a transverse magnetic circuit module complementary magnetic flux reverse motor, comprising: a stator assembly comprising a plurality of U-shaped stator cores arranged circumferentially, a front module permanent magnet, a rear module permanent magnet, a front module armature winding and a rear module armature winding; and the rotor assembly comprises a front rotor module and a rear rotor module which are axially distributed and have the same structure, rotor salient pole teeth are respectively arranged on the inner side surfaces of the front rotor module and the rear rotor module along the circumferential direction, and the rotor salient pole teeth on the front rotor module and the rotor salient pole teeth on the rear rotor module are arranged in a staggered manner along the circumferential angle. The electromagnetic torque density is remarkably improved through magnetic circuit topology optimization, more excellent power output characteristics are achieved, meanwhile, armature winding turn chain magnetic flux directions of the front module and the rear module are opposite, the phase difference is 180 deg electrical angle, magnetic linkages of the two modules are complementary, even harmonics of the magnetic linkages are counteracted after synthesis, in addition, the unique stator structure improves the air gap magnetic density of the motor, and the motor efficiency is improved. And the motor power density is improved, and the application and popularization value is extremely high.

The invention discloses a multi-branch power system stabilizer suitable for a wind-thermal bundling system, which adopts a cooperative control structure in which a low-frequency branch and a subsynchronous branch are connected in parallel, and suppresses low-frequency oscillation in a frequency band of 0.1-4Hz through a second-order filtering module, a blocking compensation module and a lead-lag module of the low-frequency branch. And the subsynchronous branch extracts a subsynchronous risk mode based on an inverse transformation matrix of a generator shafting torsional vibration mode quantity, and directionally injects a damping signal in combination with a phase compensation module to suppress subsynchronous oscillation in a frequency band of 10-50 Hz. And the parallel output module performs superposition amplitude limiting on the multi-branch signals and then accesses an excitation regulator to dynamically regulate the electromagnetic torque so as to realize wide-frequency-domain oscillation suppression. Through modal quantity directional control, parameter adaptive setting and multi-branch dynamic decoupling, the problems of insufficient multi-band suppression capability, parameter mismatch, controller conflict and the like of a traditional power system stabilizer in a wind-fire coupling system are solved, and the stability and robustness of a new energy high-permeability power grid are remarkably improved.

The present invention relates to the technical field of intelligent control of reluctance motors, and discloses an intelligent control system and method for a switched reluctance motor, comprising an acquisition module for acquiring the inductance, magnetic flux and winding current of a magnetic circuit, a data processing module for processing the acquired data and calculating the rotor angular position and outputting the electromagnetic torque, a torque monitoring unit for monitoring the electromagnetic torque of the switched reluctance motor, a control module for controlling the operation of the motor, a fault monitoring module for monitoring abnormal conditions, and an energy recovery module for recovering energy generated during motor braking. The intelligent control system and method integrate control strategies and algorithms, and can dynamically adjust parameters such as motor torque and angle according to the operating status of the motor, thereby improving the operating efficiency and response speed of the motor.

The invention discloses a speed-dependent power-assisted control method and device of an electric power steering system and a medium. The method comprises the following steps: acquiring vehicle frequency sweep experiment data; processing the frequency sweep experiment data; frequency response characteristics from steering wheel torque to a motor torque instruction and from motor electromagnetic torque to the motor torque instruction are obtained; establishing a stability controller optimization model, and calculating stability controller parameters at zero vehicle speed; the damping ratio is adjusted, and stability controller parameters under other typical vehicle speeds are calculated; determining a speed-dependent assistance mapping relation; calculating an amplitude margin and a phase margin of the electric power steering system in a main vehicle speed range based on the speed-following power-assisted mapping relation and parameters of a stability controller; and when the amplitude margin and the phase margin meet the minimum threshold requirement, finishing controller design. According to the stability controller, the stability of the electric power steering system can be guaranteed, and meanwhile the expected steering hand feeling defined by the speed-following power-assisted mapping relation can be kept as much as possible.

The invention discloses a motor multi-parameter identification method based on sampling noise excitation and bias compensation, and the method comprises the steps: firstly obtaining the voltage and sampling current of a motor, and enabling the sampling current to comprise sampling noise; then constructing an information evaluation index, and adjusting a proportional parameter of a current controller to improve the identification information amount; then, shaft voltage feed-forward compensation is constructed to suppress electromagnetic torque pulsation; recursion is carried out by adopting a least square method based on the discrete linear parameterization model to obtain a parameter initial value and a covariance matrix; secondly, estimating offset-containing parameters on line, and calculating a sampling noise variance by using an estimated residual error; and finally, obtaining unbiased parameter estimation according to bias compensation iteration updating so as to output online estimation values of stator resistance, direct-axis inductance Ld, quadrature-axis inductance Lq and permanent magnet flux linkage.

The invention provides a double-rotor direct-drive coaxial reverse-propeller electric ducted fan, which is characterized in that a single motor with an inner rotor and an outer rotor directly drives two pairs of blades, an intermediate transmission device and an inner rotor excitation group to generate a rotating magnetic field, and a first-stage propulsion component and a second-stage propulsion component with the same rotational inertia are driven under the action of electromagnetic torque with the same acting force and counter-acting force; one-way rotation deflection torque is balanced, and coaxial reverse propeller movement is achieved; the rectification duct reduces the induced resistance of the blades and improves the propulsive efficiency, the convergence and expansion guide sleeve and the motor frame body dissipate heat to form circulating heat dissipation of the Brayton heat engine, meanwhile, air is heated, expanded and ejected out to generate thrust, the efficiency is high, and the thrust is large. The dual-rotor motor direct-driven coaxial reverse propeller ducted fan propulsion unit is simple in mechanism, light in structure, large in power-to-weight ratio, high in reliability, beneficial to use in a narrow space and vertical take-off and landing, especially suitable for an EVTOL (electric vertical take-off and landing aircraft), and capable of promoting popularization of small aircrafts and vertical take-off and landing urban transportation carriers.

The invention relates to a sensorless brushless direct current motor direct torque control method based on robust extended Kalman filtering. The method comprises the following steps: acquiring stator voltage and current, and estimating an estimated rotor position, an estimated speed and an estimated electromagnetic torque of a motor through a robust extended Kalman filtering algorithm; determining a voltage space sector where a rotor flux linkage vector is located based on the estimated rotor position and the estimated speed of the motor; determining a target value based on the estimated electromagnetic torque and a reference electromagnetic torque, the target value being used to characterize a magnitude of desired electromagnetic torque adjustment; based on the voltage space sector where the rotor flux linkage vector is located and the target value, a voltage vector corresponding to the motor is obtained, and the voltage vector is used for driving the rotor flux linkage vector to rotate in the needed direction. By adopting the method, accurate control of the motor is realized without adopting a sensor.

The invention provides an electronic control hydraulic steering system driving mode switching method, system and device and a medium, and belongs to the technical field of automatic driving control. The method comprises the following steps: constructing a kinetic model of an EHPS system corner torque sensor, constructing a sliding mode observer based on the model, and accurately calculating an estimated value of a driver hand torque by compensating rotational inertia and a damping component of a steering wheel in real time; determining an adjustment factor by using a fuzzy rule according to the vehicle speed and the corner speed, and setting a dynamic threshold by combining the maximum hand torque; judging the hand intervention state of the driver in a self-adaptive time window by comparing the estimated value of the hand torque with a dynamic threshold value; after the manual intervention is confirmed, the target current value of the power-assisted motor and the road curvature in the manual driving mode and the automatic driving mode are fused, a comprehensive target current value in smooth transition is calculated, and finally the comprehensive target current value is converted into electromagnetic torque to complete the driving mode switching. According to the invention, accurate identification of driver intervention intentions and smooth control of a mode switching process are realized.

The invention relates to the technical field of compressors, in particular to a zero-leakage magnetic suspension motor direct-driven supercritical carbon dioxide compressor which comprises a motor shell, a first-stage compressor shell, a first-stage impeller, a second-stage compressor shell, a second-stage impeller, a stator, a main shaft, a sealing assembly and a cooling assembly. The stator is arranged in the motor shell, the main shaft is driven by electromagnetic torque generated by the stator to rotate, the first-stage compressor shell and the second-stage compressor shell are installed at the two ends of the motor shell in a suspended mode, the first-stage impeller and the second-stage impeller are arranged at the two ends of the main shaft respectively, and a first magnetic suspension radial bearing is arranged on the side, close to the first-stage impeller, of the stator. And a first protection bearing is arranged on the side, away from the stator, of the first magnetic suspension radial bearing. In this way, the technical problems that in the prior art, a supercritical carbon dioxide compressor uses multiple dry gas sealing accessory devices, the size is large, the operation difficulty is large, and zero leakage cannot be achieved are solved.

The invention relates to a permanent magnet synchronous motor MTPA control method based on a double-virtual direct current signal injection mode, in particular to a motor control method, and particularly relates to a control method of a built-in permanent magnet synchronous motor. A pair of virtual direct-current signals with the same amplitude and opposite polarities are injected into a current vector angle beta, Taylor expansion is carried out on electromagnetic torque containing the pair of signals, subtraction is carried out on the two signals to obtain an approximate value of the torque to a first-order partial derivative of the current vector angle, and the approximate value is input into an integral regulator; when the input quantity is controlled to be 0, the optimal current vector angle beta mtpa can be obtained, and MTPA control is achieved. In order to improve the dynamic performance and the steady-state performance of control at the same time, virtual direct-current signals with different amplitudes are selected for injection under different working conditions, the motor can be made to rapidly approach the working state of the optimal current vector angle, and fluctuation of the current vector angle in the stable state is reduced.

The invention discloses an active control method and system for suppressing torsional vibration of a permanent magnet synchronous wind driven generator, and the method comprises the steps: building a dual mass-rigidity-damping model through a lumped mass method based on transmission chain parameters and pneumatic torque, and obtaining a transmission chain dynamic equation; performing torsional vibration characteristic analysis on the natural wind speed, the pneumatic torque and the transmission chain dynamic equation to obtain a torsion angle, an eigenfrequency, a damping ratio equation and electromagnetic torque influence evaluation; and controller design is carried out on the torsional vibration mathematical model and the active disturbance rejection controller parameters to obtain an electromagnetic torque compensation amount, and active suppression of torsional vibration is realized. According to the invention, through cooperation of a physical model and intelligent control, a sensing-analysis-compensation closed loop is formed; a high-precision mathematical model is constructed, and a wind-machine-electricity coupling effect is captured; the ADRC regards unknown parameters and external disturbance as total disturbance, real-time estimation and compensation are carried out through a tracking differentiator, and an accurate system model is not needed; torsional vibration is restrained, and adaptability is enhanced.

The invention relates to the field of airplane airborne pod servo control algorithm design, and provides a method and a system for calculating external force disturbance resistance according to current feedback of a servo motor. The method comprises the steps that three-phase currents Ia, Ib and Ic and an electrical angle theta are collected, two-phase currents Id and Iq are obtained through Clarke conversion and Park conversion, and the Iq is defined as an external force disturbance resistance estimator IQ; establishing a set value r (t) and a deviation e (t) = r (t)-IQ, calculating an output u (t) of a PID controller, and writing the u (t) as a q-axis control reference into a driver: mapping to Vq and Vd in a voltage control mode for inverse transformation and PWM modulation, mapping to q-axis current reference Iqref in a current control mode, converting the q-axis current reference Iqref into a corresponding voltage instruction by a driver current loop, and driving a servo motor to generate an electromagnetic torque for counteracting disturbance and reactance. A complex motor model and a high-end inertial sensor are not needed, the calculation amount is small, disturbance can be rapidly and accurately estimated, and the stable control performance of the aircraft pod in a complex flight environment is guaranteed.

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 relates to the technical field of motors, and discloses a heavy load type deep sea motor which comprises a motor shell, the interior of the motor shell is composed of an electromagnetic cavity and a bearing cavity, an electromagnetic shaft system is arranged in the electromagnetic cavity, a bearing shaft system is arranged in the bearing cavity, and the electromagnetic shaft system comprises a stator and a rotor. The stator and the rotor are used for generating electromagnetic torque, the bearing shaft system comprises a bearing shaft, torque is transmitted between the electromagnetic shaft system and the bearing shaft system through a transmission connecting piece, axial relative movement can occur at the joint of the electromagnetic shaft system and the bearing shaft system, and a cooling circulation assembly is arranged outside the motor shell. The two relatively independent cavities are arranged in the motor shell, and the electromagnetic shaft system for providing power is separated from the bearing shaft system for transmitting power, so that the design of the bearing shaft system is basically not limited by an electromagnetic structure, a bearing with higher bearing capacity can be selected, and the axial force bearing capacity of the motor is improved.

A coaxial double-rotor column type motor disclosed by the present invention comprises a motor shell and a rotating shaft, the rotating shaft is rotatably arranged in the motor shell, two coaxial motor stators are fixed in the motor shell side by side, and a coaxial motor rotor is configured in the middle of each motor stator. The two motor rotors are fixedly arranged on the rotating shaft in a sleeving mode, and the two motor rotors generate electromagnetic torque under the action of rotating magnetic fields generated by the two motor stators so as to jointly drive the rotating shaft to rotate. The double-motor structure composed of the double rotors and the double stators is adopted, the efficiency of the motor can be remarkably improved, under the same input power, the motor can output higher mechanical power, energy loss in the conversion process is effectively reduced, and then heat generated due to energy loss is greatly reduced.

The invention discloses a dual-channel electric drive multiplexing type vehicle-mounted charging system unbalanced current suppression method, which comprises the following steps of: firstly, popularizing and applying a positive and negative sequence separation method for decoupling a dual-synchronous coordinate system to a dual-channel six-phase motor, and calculating positive and negative sequence components of a dq axis of a dual-channel system under a current unbalanced working condition; utilizing Park and VSD transformation to map the data to an alpha beta xy0102 sub-plane; secondly, setting a positive-sequence current given value and a negative-sequence current given value to be 0 by using a six-phase current distribution method for minimizing electromagnetic torque; then, independent PI control is carried out on each sub-plane; and finally, correspondingly adding the output quantities of the positive sequence current and the negative sequence current of each sub-plane, returning to a natural coordinate system through TVSD-1, and then outputting SPWM, thereby realizing a three-phase charging working condition. According to the method, the suppression of the negative-sequence current can be realized, the sine degree of the power grid current is improved, the torque ripple is suppressed, and the system safety is guaranteed.