275 results about "Maximum torque" patented technology

The invention discloses a weight coefficient-free model prediction control system and method for a permanent magnet synchronous motor, and particularly belongs to the field of permanent magnet synchronous motor control. The control system comprises a direct current voltage source, a three-phase converter, a permanent magnet synchronous motor, a rotating speed outer ring PI control module, an MTPA flux linkage calculation module and a model prediction control module. The control method comprises the following implementation steps: firstly, establishing a torque and flux linkage prediction model of the permanent magnet synchronous motor; then, a reference torque amplitude value and a reference flux linkage amplitude value are obtained through a rotating speed outer ring PI controller and a maximum torque per ampere (MTPA) calculation module respectively; secondly, constructing an independent torque cost function and a flux linkage cost function according to the torque error and the flux linkage error, and forming a cascade form; evaluating the switching states by using a cost function, selecting two vectors from the eight switching states of the converter by using the independent cost function of the torque (or flux linkage), and selecting an optimal vector from the two vectors by using the independent cost function of the flux linkage (or torque); and finally, the execution sequence of the torque and flux linkage cost function is alternated in each subsequent period. Compared with the prior art, the method avoids complex weight coefficient design through a cost function cascading mode, alternates the execution sequence of the cost functions in each period, dynamically balances the weights of the two control targets, and reduces the number of calculation times.

The invention belongs to the field of motor control, and relates to a permanent magnet synchronous motor MTPA control method based on end-to-end reinforcement learning, in a motor control system, motor current and rotating speed collected in real time are constructed into a state vector, a trained intelligent agent is input for reasoning, and control voltage is output as an action vector. Finally, a voltage instruction is correspondingly generated to drive a motor; the network structure of the intelligent agent is constructed based on a TD3 algorithm, training data of the intelligent agent comprises random motor physical parameters and dynamic motor working condition rotating speed, iterative training of the intelligent agent is based on a dynamic reward function, and the intelligent agent is guided to converge automatically through the dynamic reward function. According to the method, a control strategy of directly mapping the rotating speed and the current state of the motor to the optimal voltage instruction can be obtained, so that rotating speed tracking is met, the maximum torque-current ratio working point is spontaneously converged, and the method has adaptive compensation capability for parameter nonlinear drift in motor operation.

The invention discloses a hybrid power parameter determination method and device and electronic equipment, and relates to the field of vehicle design, and the method comprises the steps: determining the engine displacement of which the average operation power of an engine is consistent with a target fuel consumption area according to the average operation power, the torque standard deviation, the maximum torque fluctuation value and the fuel type in a vehicle road spectrum; according to the method, the determined engine can work in the interval with higher efficiency, the fuel economy is improved while the conventional power requirement is met, and the engine cost is reduced. The rated power of the motor is further determined according to the maximum operation power in the vehicle road spectrum and the target engine external power, and the target engine external power is the external power corresponding to the target vehicle speed or the target rotating speed under the maximum operation power. And determining the battery capacity according to the rated power of the motor, the climbing duration in the vehicle road spectrum and the battery adjustment coefficient. And on the basis of the engine, motor driving is matched to increase the endurance mileage, and the economy of the whole vehicle is improved.

The invention discloses a vehicle control method and device based on a permanent magnet motor. The method comprises the steps of determining a torque output value according to a current rotating speed instruction and an actual rotating speed of a motor based on a rotating speed control strategy in a current rotating speed control period; determining the current required torque according to the torque output value, the current torque limit value and the maximum torque of the motor; determining the current state of the motor at least according to the symbol of the actual rotating speed and the symbol of the current required torque; wherein the current state comprises an electric state or a braking state; the symbols comprise a positive sign and a negative sign; determining a first target current and a second target current according to a first preset corresponding relation corresponding to the current state, the current demand torque, the actual rotating speed and the symbol of the current demand torque; when the current states of the motor are different, the corresponding first preset corresponding relations are different; and controlling the voltage output to the motor according to the first target current and the second target current. According to the technical scheme, the accuracy of vehicle control is improved.

The invention discloses a performance analysis method for a topological structure of a multi-topology axial flux permanent magnet motor based on electromagnetic-thermal coupling, and the method comprises the steps: firstly building three-dimensional electromagnetic finite element models of four typical axial flux permanent magnet motors, and calculating electromagnetic loss including iron core loss, copper loss and permanent magnet eddy current loss; importing the loss data into a three-dimensional fluid-thermal coupling model, and simulating the temperature rise of the motor under a natural cooling condition; the performance of the motor is subjected to double constraints of winding insulation and irreversible demagnetization temperature of a permanent magnet, so that the maximum current density of safe steady-state operation of the motor is determined and identified by adopting an iterative electromagnetic-thermal coupling analysis method, and the maximum torque density of each topological structure is evaluated under thermal constraints. The electromagnetic performance and the thermal constraint can be coupled, so that the optimal performance achieved by different axial magnetic flux permanent magnet motor topological structures can be compared, and the problem of inaccurate performance evaluation caused by neglect of the thermal constraint in the existing motor design is solved.

The invention relates to a stabilization self-adaptive control method and device based on double gyroscopes, and the self-adaptive control method comprises the steps: constructing a real-time updated'sea wave-ship-double gyroscope 'coupling dynamic model, and introducing the online identification of ship rolling parameters; physical limit, damping, maximum torque and other constraints of the double-gyroscope executing mechanism are explicitly written into a control law; the two gyroscopes are symmetrically arranged and opposite in precession direction, so that yawing torques are mutually counteracted and rolling torques are superposed, and the stabilization efficiency is improved; adaptively selecting PID according to the rolling amplitude, the sea condition uncertainty and the working state of the actuator, and adaptively switching the fuzzy adaptive PID and the model prediction control strategy; calculating a control instruction based on the selected strategy and the updating model, and performing physical constraint processing such as torque saturation and angle amplitude limiting; and outputting a safety instruction to drive the gyroscope to generate stabilization torque. The method can adapt to different working conditions, and the efficient and stable active stabilization performance and stabilization effect are kept under the multiple working conditions.

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 torque distribution method, an electric drive system, an electric vehicle, equipment and a medium. The method comprises the following steps: predicting temperature data of an inner stator of each electric drive in a future preset duration according to a current temperature parameter of each electric drive and a stator temperature prediction model corresponding to a current torque; determining a torque derating coefficient corresponding to each electric drive according to a maximum torque derating strategy corresponding to the current driving mode and the current stator temperature corresponding to each electric drive; the temperature data and the torque derating coefficient of the inner stator of each electric drive in the future preset duration are uploaded to a vehicle control unit, so that the vehicle control unit carries out torque distribution on each electric drive with the shortest duration for achieving the consistent stator temperature of the front drive and the rear drive as the target; the torque derating coefficient is used for limiting the maximum torque distributed to the corresponding electric drive by the vehicle control unit. By means of the method, the electric drive thermal state and torque distribution can be considered, single electric drive passive derating is avoided, the power potential is fully utilized, the torque sudden change pause feeling is eliminated, and the driving experience consistency is improved.

The invention discloses an oil temperature control method and device for a water-cooling electric drive system. The method comprises the steps that the rotating speed and torque of a vehicle motor at the current collection moment and historical accumulated heat in reducer oil at the previous collection moment are obtained; if the rotating speed is larger than a preset rotating speed threshold value, table look-up calculation is conducted in a preset target relation table according to the rotating speed and the torque, and the duration corresponding to the rotating speed is determined; according to the duration and the historical accumulated heat at the previous collection moment, target accumulated heat in the reducer oil at the current collection moment is determined; and if the target accumulated heat is greater than the heat threshold value, performing limit value updating on the torque according to the rotating speed and the target relation table to obtain the updated torque for motor adjustment and operation. Therefore, an accurate pre-judgment mechanism of the oil temperature risk is formed by collecting motor parameters in real time, looking up a table to judge the risk and calculating the accumulated heat; and when the heat exceeds the threshold value, the maximum torque output meeting the duration requirement is screened, and balance of safe temperature control and power retention is achieved.

The purpose of the present invention is to provide: a rotor for a rotary electric machine, the rotor being capable of reducing torque ripple while suppressing a decrease in maximum torque; and a rotary electric machine. This rotor 3 comprises a rotor core 31 having: magnets; magnet insertion holes into which the magnets are inserted; and flux barriers provided around the magnets. The magnets include: first magnets 32; and second magnets 33 that are arranged in roughly a V-shape inwardly of the first magnets 32 in the radial direction. The flux barriers include: first flux barriers 34a that face the side surfaces 33a of the second magnets 33 at the outer sides thereof in the radial direction; and second flux barriers 34b that are arranged outwardly of the first flux barriers 34a in the radial direction. Each second flux barrier 34b comprises: a first side 34b1 which follows an outer peripheral surface tangent line TL of the rotor core 31; and a second side 34b2 which is located inwardly of the first side 34b1 in the radial direction and of which at least a part is formed along a side 34a1 of the first flux barrier 34a at the outer side thereof in the radial direction.

The invention discloses a synchronous permanent magnet coupling coupler capable of adjusting torque on line, comprising an outer shaft sleeve used for connecting a load shaft; inner shaft sleeves are arranged at one axial end of the outer shaft sleeve at intervals and used for being connected with a driving shaft. A first carrier is coaxially arranged at the end, facing the inner shaft sleeve in the axial direction, of the outer shaft sleeve. An adjusting carrier is arranged on the inner circumferential face of the first carrier in a sliding mode and driven by an adjusting mechanism to move in the axial direction. Outer rotor magnetic steel is arranged on the inner circumferential surface of the adjusting carrier; inner rotor magnetic steel is arranged on the peripheral face of the part, extending into the first carrier, of the inner shaft sleeve, the inner rotor magnetic steel and the outer rotor magnetic steel are correspondingly arranged, and an air gap is formed between the inner rotor magnetic steel and the outer rotor magnetic steel in the radial direction. The maximum torque value can be flexibly adjusted on line, the requirement for entering a protection state in time under different working conditions is met, and the application range is wide.

The invention provides an energy management method, electronic equipment and a vehicle, the method is applied to the technical field of vehicle energy management, and the method comprises the steps that in a direct drive mode, the maximum engine torque is determined according to the battery electric quantity difference value and the engine rotating speed; m engine target discrete torques are obtained based on the maximum engine torque, the engine rotating speed and the discrete engine demand torque; m discrete parameter sets are determined according to the M engine target discrete torques and the engine rotating speed; and target working parameters of the engine are determined. The maximum torque limit value of the engine is determined by combining the battery capacity, and balance between the output torque and the capacity of the engine is guaranteed. In addition, the basic demand torque is determined firstly, and then a small amount of local discretization is performed to obtain the optimal parameter of the engine, so that the optimization workload is reduced, the optimal parameter is matched with the current vehicle working condition, the optimization accuracy is ensured, the fuel economy of the vehicle is improved, the fuel loss of the engine is reduced, and the energy distribution and energy conversion efficiency of the vehicle are optimized.

The alternating-current synchronous motor comprises a stator shell and a rotor, the stator shell is arranged on the ground, the rotor is arranged in the stator shell through an end cover and an insulating bearing, the rotor comprises a rotating shaft and a rotor iron core, the rotor iron core is arranged on the rotating shaft, and a tooth groove set is formed in the rotor iron core in a concave mode. The tooth groove group is composed of a plurality of adjacent tooth grooves, and the windings are arranged in the tooth grooves. The motor has the advantages that the relative positions of the stator and the rotor tooth grooves are collected through the rotor position sensor, the current of the three-phase alternating current and rated torque input are collected through the current sensor, the magnitude of the current of the three-phase synchronous alternating current is controlled, the torque of the motor is controlled, and winding arrangement is optimized, so that the reliability of the motor is improved. In the working process, the magnetic potential direction of the rotor is perpendicular to the magnetic potential direction of the stator at any position, then the maximum torque under the current is output, and meanwhile, the stator permanent magnet cannot be demagnetized due to the change of the magnetic field of the rotor.

The invention relates to the technical field of vehicle control, in particular to an engine power compensation control method, electronic equipment and a vehicle. The method comprises the steps that current environment data of the vehicle and engine running state data are obtained; inputting the environment data into an environment prediction model, and extracting current environment features; the current environment data and the engine operation state data are jointly input into an engine torque prediction model, and the maximum engine torque value in the current environment is obtained; inputting the current environment characteristics and the maximum torque value into a torque compensation control instruction generation model to generate a corresponding torque compensation control instruction; and finally, performing power compensation control on the engine according to the instruction. According to the method, a cooperative control framework integrating environment prediction, torque estimation and intelligent decision making is constructed, dynamic precise compensation of engine dynamic response in a complex environment is achieved, and the torque output precision and the self-adaptive control capacity of the vehicle under special working conditions are effectively improved.

A kind of maximum torque current ratio-based full-order flux linkage observer virtual voltage signal generation method belongs to motor position sensorless control technical field.The present application aims at the problem that the amplitude of existing virtual voltage signal injection based on full-order flux linkage observer is extremely difficult to adjust,which cannot realize stable operation under different load conditions at zero speed.The present application includes the following steps: constructing full-order flux linkage observer based on the voltage equation of built-in permanent magnet synchronous motor under estimated rotating shaft system;linearizing decoupling the flux linkage error dynamic equation of full-order flux linkage observer at local point to obtain the mathematical expression relationship between position estimation error of full-order flux linkage observer and virtual voltage signal;then establishing the relationship between position estimation error and torque of built-in permanent magnet synchronous motor;setting position estimation error as maximum torque current ratio angle,calculating to obtain the injection coefficient of virtual voltage signal;generating virtual voltage signal based on the injection coefficient.The present application can realize parameter tuning of motor position observer.

The utility model relates to the technical field of squirrel-cage synchronous motors, in particular to a rotor punching sheet and a stator punching sheet on a squirrel-cage synchronous motor of a refrigerator compressor, which comprise 24 stator grooves including two special-shaped grooves A and two special-shaped grooves B, two punching sheet yoke parts 1 form a tip structure of the stator punching sheet, and the included angle of the tip end of the rotor groove is set to be 150-165 degrees. According to the technical scheme of the utility model, one side of the stator punching sheet structure adopts the traditional long-edge design, the other side adopts the pointed-end structure, and four of the 24 slots adopt the special-shaped slot design, so that the size rationality of the yoke part of the motor is ensured, the rationality of the magnetic circuit of the motor in design is ensured, the utilization rate of silicon steel of the motor is improved, and the consumption of silicon steel is reduced; the groove-shaped tooth tip parts of the rotor punching sheet are distributed at 150-165 degrees, and on the premise that the tooth width and the groove-shaped length of the rotor are not changed, the cast aluminum volume of the rotor is improved, so that the impedance of the rotor is improved, the magnetic flux density of the rotor is increased, the maximum torque of the motor is improved, and the starting performance of the compressor is improved.

An electromechanical brake cylinder (2) for actuating a wheel brake (1), in particular a wheel brake (1) of a rail vehicle, comprises: an electric motor (3) with a rotor (5), a spindle nut (7), a torque transmission device provided between the rotor (5) and the spindle nut (7), and a threaded spindle (8). The spindle nut (7) and the spindle (8) are configured to convert a rotary movement of the spindle nut (7) into an axial movement of the spindle (8), wherein the axial movement of the spindle (8) can be converted into a movement of a brake pad (17) of the wheel brake (1) relative to a braking element of the wheel brake (1), and wherein the torque transmission device is configured to transmit a torque less than or equal to a maximum predetermined torque value between the rotor (5) and the spindle nut (7).

The application provides a permanent magnet synchronous motor weak magnetic transition area smooth transition method and system based on a reference voltage adaptive reduction, and belongs to the field of permanent magnet synchronous motor control. The method solves the problem of torque fluctuation caused by voltage overshoot in the existing voltage closed-loop weak magnetic control with a fixed reference voltage. The method comprises the following steps: obtaining a theoretical maximum torque according to a preset current limit value by simultaneously solving a torque equation and a current constraint equation; calculating torque ratio parameters and speed ratio parameters in real time; calculating a reference voltage adaptive coefficient based on an adaptive smooth transition algorithm; multiplying the adaptive coefficient by the inscribed circle voltage of an inverter to dynamically adjust the reference value of the voltage closed loop, so that smooth control of the weak magnetic transition area is realized. The method is mainly used in the fields of electric aircrafts, electric vehicles and robots.

The invention discloses a stator assembly, a motor and a compressor, the stator assembly comprises a stator punching sheet, a main winding and an auxiliary winding, the stator punching sheet is provided with winding grooves, a plurality of winding grooves form four groove groups, the four groove groups are located in four quadrants, and the winding grooves are arranged in the winding grooves. Each groove group comprises two first grooves, two second grooves, a third groove and a fourth groove, and the slotting sizes of the first grooves, the second grooves, the third groove and the fourth groove are sequentially reduced; the main winding is arranged in the first groove, the second groove and the third groove; the secondary windings are arranged in the second groove, the third groove and the fourth groove, and the secondary windings in the second groove and the third groove are located on the radial inner sides of the primary windings in the second groove and the third groove. Therefore, by optimizing the groove type of the winding groove and the layout of the main winding and the auxiliary winding, the starting torque of the motor can be improved and the starting requirement can be met under the condition that the efficiency and the maximum torque are ensured, and then a starter can be omitted, so that the cost is saved, the size is optimized and the operation reliability is improved.

This invention discloses a sensorless adaptive starting method for a high-speed permanent magnet synchronous motor. The method first... I‑f A high-speed permanent magnet synchronous motor under starting conditions is modeled. Based on this, a speed differential damper is designed to compensate for the reference speed, increase the system damping ratio, and improve starting stability. Then, an extended state observer-phase-locked loop structure is constructed to demodulate the position, speed, and speed differential, providing a basis for the adaptive starter controller and the speed differential damper. Finally, an adaptive starter controller is designed to coordinate the adjustment of the current vector amplitude and acceleration, ensuring that the motor always operates near the maximum torque-to-current ratio operating point, balancing stability, speed, and high efficiency.

The application relates to a compact active artificial knee joint with a torque adjusting device, which comprises a knee joint module, a receiving cavity connecting block, a lower leg connecting piece and a torque adjusting device, wherein the torque adjusting device comprises a spiral spring, a bent spring groove and the like, the knee joint module comprises a knee joint shell, a knee joint shaft center, a knee joint stator sleeve end cover and the like, one end of the spring is fixed at the upper receiving cavity connecting lug through an opening on the motor stator sleeve end cover, and the other end is fixed in the bent spring groove at the position of the motor stator sleeve end cover and the knee joint shaft center. The torque adjusting device can realize torque assistance and adjustment according to the angle size and direction of the limb rotation; meanwhile, the driving peak torque of the motor can be reduced, the size and the maximum torque of the driving motor are smaller due to the fact that the artificial limb needs to be easily worn, energy consumption and space are saved.

The invention provides a power generation power switching method and system of a range extender, a storage medium and a program product, and relates to the technical field of engine control, and the method comprises the steps that the required power of the range extender is monitored; when the required power is increased, a first switching control strategy is triggered to start a generator rotating speed control mode, target rotating speeds of the generator in different control periods are dynamically adjusted based on the required power, and the torque minimum value of the generator in each control period is limited to be not smaller than the actual torque of the generator in the previous control period; when the required power is reduced, a second switching control strategy is triggered to start a generator rotating speed control mode, target rotating speeds of the generator in different control periods are dynamically adjusted based on the required power, and the maximum torque value of the generator in each control period is limited to be not larger than the actual torque of the generator in the previous control period. According to the method, the power reverse warping phenomenon can be effectively avoided through a limiting measure on the torque of the generator.

The utility model relates to the technical field of control switches, and provides a change-over switch and an electric tool, and the change-over switch comprises a switch body, a first operation part, a triggering part, an induction part and a regulator. The first operating piece is movably connected to the switch body; the triggering piece is arranged in the first operating piece and can synchronously move along with the first operating piece; the sensing piece can be triggered and sensed by the triggering piece and generates a corresponding state signal; the regulator is arranged outside the switch body, is electrically connected with the induction piece, and is used for regulating equipment electrically connected with the regulator according to the state signal; the sensing piece can generate a first state signal and a second state signal; under the first state signal, the regulator outputs a forward rotation instruction of the motor; and under the second state signal, the regulator outputs an instruction of motor reverse rotation and maximum torque. Both of the two can solve the problem that the gear of the electric tool is still kept in the previous state after forward and reverse rotation switching.

The invention discloses a gear shifting control method and system for an electric loader, and the method comprises the steps: obtaining the speed of the loader, the opening degree of an accelerator pedal and the road condition after a reversing demand of the loader is received; the braking demand torque of the loader is determined according to the loader speed, the accelerator pedal opening degree, the road condition and the selected braking demand torque determination principle, the braking demand torque determination principle comprises the maximum torque determination principle and the demand torque determination principle, and the maximum torque determination principle converts the maximum braking torque of the loader under the loader speed into the demand torque determination principle. The torque is used as braking required torque of the loader; according to the demand torque determination principle, the braking demand torque is determined according to the loader speed, the accelerator pedal opening degree and the road condition; the loading machine is braked according to the braking demand torque of the loading machine; and when the loader is braked to the gear shifting vehicle speed, the loader is controlled to shift gears. Automatic speed reduction control over reversing of the loading machine is achieved, and then automatic gear shifting of the loading machine is achieved.

The invention is suitable for the technical field of intelligent electric meters, and relates to a sectional type soft start method of an external circuit breaker of an electric energy meter, a medium and a terminal. Determining the maximum torque force of the required motor, and selecting a proper motor; determining the longest contact time of the rotor commutation sheet and the electric brush; the first starting stage comprises the steps of confirming values of Ton and Toff, calculating the number of starting pulses, and pre-starting; in the second starting stage, a fixed pulse mode is adopted, the rotating speed is increased in the mode of increasing the duty ratio, and on the basis of the Ton time, the Ton opening time is increased; entering a third starting stage: increasing the duty ratio of the starting pulse again; after the three stages are completed, the duty ratio is switched to be 1, and full-speed operation is achieved. The method is convenient to operate and low in cost, the overload protection mode of the power supply is skipped while the starting current of the motor is reduced, and the power supply with low power supply capacity can bear large current impact when the motor is started.

The embodiment of the application provides a clutch control method, an electronic device, a storage medium and a program product of a vehicle, relates to the technical field of clutch control, and the method comprises the following steps: acquiring working condition monitoring data of the vehicle when the vehicle is in a pure motor driving starting state; calculating total input torque required by a gearbox input end according to the working condition monitoring data; in the case that the total input torque exceeds the maximum torque that can be provided by the motor to the gearbox, calculating a first torque that needs to be input to the gearbox by the clutch; calculating a required position of the clutch based on a first mapping relationship between the required position of the clutch and the compression force of the clutch and a second mapping relationship between the compression force of the clutch and the first torque; and controlling the clutch according to a position error between the required position and the actual position of the clutch. The embodiment of the application can adapt to various starting working conditions, effectively supplement the gap of motor power, and improves the power performance of the pure electric starting of the hybrid vehicle.

The application discloses a wind turbine load control method and system under the condition of stuck blade, which calculates the real-time hub bending moment and hub bending moment change rate through the blade root load of the wind turbine, predicts the hub bending moment of multiple time periods in the future according to the hub bending moment and the hub bending moment change rate, and obtains the predicted hub bending moment of different time scales; the pitch rate of the wind turbine is dynamically adjusted according to the predicted hub bending moment of different time scales, the pitch rate is doubly adjusted in the azimuth angle interval where the fault blade contributes most to the hub bending moment in combination with the azimuth angle information of the wind turbine; and the maximum torque output and yaw action of the wind turbine are simultaneously controlled. The algorithm is simple and effective, can greatly reduce the load of the main part of the wind turbine under the condition of stuck blade, improve the safety of the wind turbine, reduce the design cost of the wind turbine, and reduce the power generation loss of the wind turbine under the condition of stuck blade.

The utility model relates to the technical field of motors, and particularly discloses a large-torque motor which comprises a stator assembly and a rotor assembly. The stator assembly comprises a stator punching sheet. The periphery of the stator punching sheet is uniformly provided with a plurality of winding grooves around the center of the stator punching sheet. The rotor assembly comprises a plurality of magnets which are uniformly arranged around the stator punching sheet; the number of the winding grooves is 15, and the number of the magnets is 14 or 16. Or, the number of the winding grooves is 18, and the number of the magnets is 14, 16, 18, 20 or 22; or, the number of the winding grooves is 24, and the number of the magnets is 20, 22, 24, 26 or 28. According to the utility model, the maximum torque of the motor is improved through reasonable matching of the winding grooves and the magnets.

Disclosed are a control method and a control device for a permanent magnet motor, wherein the control method comprises: determining active current reference initial values and reactive current reference initial values of the permanent magnet motor in a current control period; searching for optimal active current reference values and reactive current reference values in the current control period based on the active current reference initial values and the reactive current reference initial values, with the maximum torque current ratio in the current control period as the target; and controlling the permanent magnet motor to operate based on the optimal active current reference values and the reactive current reference values; wherein the torque current ratio is calculated based on a torque instruction value received by the permanent magnet motor from a fan main controller and an output current value of the permanent magnet motor. The technical solution of the disclosure can avoid the influence of parameter changes of the permanent magnet motor on the maximum torque current ratio control, thereby realizing accurate optimal torque current ratio control.

The application discloses a kind of self-adapting permanent magnet synchronous motor fault-tolerant control methods based on dynamic phase-locked loop, first, by analyzing the operating characteristics under minimum copper loss mode and maximum torque mode, a unified reference current strategy is constructed in harmonic subspace.Second, the second-order generalized integrator phase-locked loop is used to extract the fault current angle, ensuring that reliable angle estimation can be achieved under light load conditions.In addition, the fault angle information obtained by identification is used to adjust the current reference parameters, allowing flexible switching between minimum copper loss and maximum torque operating modes without the need for additional control structures related to fault types.The application has a smooth dynamic process when the motor switches from the fault state to the fault-tolerant running state without additional hardware.