364 results about "Motor efficiency" patented technology

The invention discloses an asynchronous motor energy-saving monitoring and dynamic early warning method based on situation awareness, and relates to the technical field of asynchronous motor energy-saving monitoring. The method comprises the steps that S1, multi-source heterogeneous data are synchronously collected, power supply parameters and operation parameters are obtained in real time, and a frequency conversion working condition self-adaptive deviation value and a current stability coefficient are obtained; s2, generating four-dimensional situation factors including an overtemperature danger value, a current stability coefficient, a voltage stability coefficient and a frequency deviation value; s3, constructing a fourth-order transmission network, and generating a primary early warning signal based on the path mark combination; s4, calculating the motor efficiency in real time, triggering an efficiency abnormity mark, fusing the efficiency abnormity mark with the primary early warning signal, and reconstructing a final early warning instruction; and S5, executing hierarchical control according to the final early warning instruction. Through multi-parameter coupling and dynamic early warning transmission, the early-stage capture capability of the composite fault is improved, the early warning response delay is shortened, energy-saving optimization and fault protection of the motor are realized, and the method has a remarkable practical value.

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 embodiment of the invention provides a refrigerator performance prediction method and device, electronic equipment and a storage medium, and belongs to the technical field of refrigerators. The method comprises the steps that operation state parameters of a refrigerating machine unit are obtained, the refrigerating machine unit comprises a refrigerant system, the refrigerant system comprises an evaporator, a condenser and a compressor, and the operation state parameters comprise the first saturation temperature and the steam superheat degree of the evaporator, the second saturation temperature and the liquid supercooling degree of the condenser and the exhaust temperature of the compressor; calculating a first energy efficiency coefficient of the refrigerant system according to the first saturation temperature, the steam superheat degree, the second saturation temperature, the liquid supercooling degree and the exhaust temperature; obtaining rolling bearing transmission efficiency and motor efficiency of the refrigerator unit; and calculating a second energy efficiency coefficient of the refrigerator unit according to the rolling bearing transmission efficiency, the motor efficiency and the first energy efficiency coefficient. According to the embodiment, the accuracy of refrigerator performance prediction can be improved.

The invention discloses a motor rotor core and a manufacturing method thereof, and belongs to the technical field of motor design and manufacturing. The rotor iron core comprises an iron core main body formed by laminating a plurality of punching sheets, and self-adhesive sheet end plates and arc-shaped pressing rings which are arranged at the two ends of the iron core main body. The self-adhesive sheet end plate is formed into a whole by heating, pressurizing and curing a self-adhesive sheet coated with epoxy resin or acrylic resin; the arc-shaped pressing ring is provided with a cambered surface structure, so that synchronous pressing in the axial direction and the radial direction can be achieved. And the iron core main body adopts a transposition lamination process, so that burrs of the punching sheet are uniformly distributed. Through chemical bonding of the end plates of the self-adhesive sheets, mechanical wedge-caulking of the arc-shaped pressing rings and error homogenization of transposition lamination, and through combination with the double-end tensioning screw subjected to insulation treatment, the problems that a traditional rotor iron core end punching sheet is prone to loosening, stress concentration and large eddy-current loss are caused by burrs, dynamic balance precision is poor and the like are effectively solved, and the service life of the rotor iron core end punching sheet is prolonged. And the structural rigidity, the operation stability and the motor efficiency of the rotor iron core are obviously improved.

The invention discloses a new energy automobile motor efficiency control method and system, and relates to the technical field of efficiency control, and the method comprises the steps: carrying out the data collection of the operation state of a new energy automobile motor, and constructing a motor digital twin efficiency model; performing dynamic coupling analysis based on the motor digital twin efficiency model to extract a multi-field coupling influence factor, predicting the degradation trend of the motor efficiency parameter of the new energy vehicle based on the multi-field coupling influence factor, and determining a degradation trend prediction result; the method comprises the steps of establishing an environment disturbance factor library, obtaining real-time road condition topological data and driving behavior characteristic data, constructing a dynamic disturbance scene set based on the environment disturbance factor library, the real-time road condition topological data and the driving behavior characteristic data, and confirming an optimization strategy based on the dynamic disturbance scene set; and generating a dynamic efficiency regulation and control instruction set based on a degradation trend prediction result and an optimization strategy, and realizing energy efficiency closed-loop optimization control of the driving motor. The method has the effect of improving the motor control efficiency of the new energy automobile.

The invention discloses a stator and rotor punching sheet and magnetic steel for a concentrated winding type frameless torque motor, and belongs to the technical field of concentrated winding type motors, the stator and rotor punching sheet comprises a rotor punching sheet, a stator punching sheet and magnetic steel, and the center of the rotor punching sheet is provided with a rotor iron core; the stator punching sheet is composed of yoke parts and tooth parts, the tooth parts are trapezoidal teeth, the tooth parts and the stator grooves are distributed at equal angles, the tooth parts and the stator grooves are alternately arranged, and the stator grooves are straight grooves; the inner side of the stator punching sheet is also provided with a rotor punching sheet and magnetic steel, the rotor punching sheet and the magnetic steel form a motor rotor, and the motor rotor is a surface-mounted rotor. According to the stator and rotor punching sheet and the magnetic steel for the concentrated winding type frameless torque motor, the winding grooves of the stator iron core are flat-bottom straight grooves, the flat copper wires are wound in the winding grooves, the flat wire coils are fixed to the tooth portions through glue, integral potting is carried out after fixing is completed, and compared with a traditional pear-shaped groove for containing round wire windings, the stator and rotor punching sheet is simple and firm in structure, high in groove fullness rate, high in motor efficiency and improved in stability.

The invention relates to the field of power control, and particularly discloses an electric four-wheel drive torque distribution method based on a climbing working condition, which comprises the following steps: defining vehicle state parameters, power system parameters, vehicle real-time driving state parameters and road condition parameters; carrying out torque calculation by utilizing Julia, considering shaft load, friction coefficient, motor efficiency and yaw velocity correction, obtaining a comprehensive weight of a front shaft and a rear shaft, and carrying out normalized torque distribution; and establishing model simulation through Modelica, and verifying the effectiveness of the distribution scheme. According to the invention, the climbing performance of the vehicle can be improved, the control flexibility and driving stability of the vehicle are improved, the energy consumption is reduced, the dynamic stability is enhanced, and the method is suitable for power control of the electric four-wheel-drive vehicle under the climbing working condition.

The invention provides an efficiency optimization control method of a permanent magnet synchronous motor and related equipment. The method comprises the following steps: acquiring an output current of an inverter; constructing an inverter loss model based on the output current of the inverter and the inverter loss coefficient; constructing a total loss model based on the electromagnetic loss model, the inverter loss model and an equivalent conversion method; constructing a current population by taking the plurality of d-axis current values as individuals; and performing optimization solution based on the total loss model, the current population, a PID search algorithm and an artemisinin optimization algorithm to obtain a global optimal solution and control the permanent magnet synchronous motor. According to the scheme, the driver loss is added into the total loss model, and efficiency optimization can be carried out on the whole motor driving system; in order to solve the problem that a traditional method is not suitable for an IPMSM, a PID search algorithm and an artemisinin optimization algorithm are combined, parameter search is carried out on a motor efficiency optimal point by simulating an incremental PID controller adjusting mechanism, a global optimal solution is obtained, and therefore optimal control over the click efficiency is achieved.

The invention discloses a connecting structure of frameless torque motor flat wire windings, which belongs to the technical field of frameless torque motors, and comprises a stator consisting of a stator core and windings, the stator core comprises stator slots and tooth parts, each phase of winding consists of N sets of two groups of flat wire coils, the width of the flat wire coil is gradually increased from the inner diameter side of the stator to the outer diameter side of the stator, the current direction of the coil accords with regular circulation of positive and negative and positive, each set of coil connecting wire is formed by connecting in the same layer, and compared with a coil with the outer side and the inner side connected with a cross-layer wire, the end space can be reduced, and the end height can be reduced. Compared with a round wire winding, the connection structure of the frameless torque motor flat wire winding has the advantages that the slot fullness rate can be increased, the motor efficiency is high, the stability is improved, the space utilization in a stator slot can be greatly improved through a specific wire connection mode, the space waste in the slot is reduced, the windings are more compact, the overall consumables are less, and the connection and assembly are more convenient.

The invention discloses a variable-speed water pump energy consumption model correction method, and relates to the technical field of fluid mechanical energy efficiency optimization. The problems that an existing water pump energy consumption model is low in prediction precision and poor in adaptability due to efficiency parameter solidification, insufficient working condition data coverage and lack of dynamic correction capacity are solved. The method comprises the steps of establishing a water pump energy consumption model; acquiring wide-range water pump energy consumption and related parameters for water pump modeling at different rotating speeds; establishing a water pump efficiency model and a water pump efficiency correction coefficient model; establishing a water pump motor efficiency model and a frequency converter efficiency model; obtaining the actual operation flow and lift of the water pump, and predicting the energy consumption of the water pump by using the corrected water pump energy consumption model.

The invention provides a performance prediction method and device based on a refrigerating machine, electronic equipment and a storage medium, and relates to the technical field of refrigeration, and the method comprises the steps that the condensation saturation temperature, the evaporation saturation temperature and the compression exhaust temperature of a refrigerating system are collected in the running test operation process, so that the saturated liquid phase enthalpy and the saturated gas phase enthalpy are determined; according to the condensation saturation pressure calculated according to the condensation saturation temperature and the compression exhaust temperature, the overheat gas specific enthalpy is determined, system refrigeration energy efficiency prediction is conducted according to the saturated liquid specific enthalpy, the saturated gas specific enthalpy and the overheat gas specific enthalpy, and the target system refrigeration energy efficiency is obtained; and performing unit performance prediction on the target refrigerator by using the target refrigeration performance model, the target system refrigeration energy efficiency, the frequency converter efficiency, the motor efficiency and the bearing transmission efficiency. According to the method, the actual refrigerating performance calculation of the refrigerating machine unit from the refrigerating cycle theory can be realized, the problem of performance prediction deviation of the refrigerating machine is effectively solved, and the performance prediction effect of the refrigerating machine is improved.

The invention discloses a unipolar motor based on magnetic pole modulation and harmonic slot collaborative optimization, which comprises a unipolar rotor punching sheet, the peripheral surface of the unipolar rotor punching sheet is provided with alternate first magnetic poles and second magnetic poles, the polarities of the first magnetic poles and the second magnetic poles are opposite, the periphery of the first magnetic poles is provided with a first arc, and the periphery of the second magnetic poles is provided with a second arc. The periphery of the first magnetic pole is provided with a first arc, the periphery of the second magnetic pole is provided with a second arc, the first arc and the second arc are concentrically arranged relative to the center of the unipolar rotor punching sheet, and the radius of the first magnetic pole is greater than that of the second magnetic pole, so that the air gap magnetic resistance is increased and the motor efficiency is ensured under the condition that the effective area of the air gap magnetic flux is not obviously changed; the amplitude of each order harmonic electromagnetic radial force caused by a rotor magnetic field is reduced, and the purpose of reducing the vibration noise of the motor is achieved. The motor has wide application prospects in the fields of new energy automobiles, aerospace, numerical control machine tools and the like, and the comfort and high-end quality of products can be effectively improved.

The invention discloses a pumping unit disc type permanent magnet motor multi-objective parameter optimization method, which relates to the technical field of motor design and optimization, and comprises the following steps: pre-establishing a multi-physical field coupling simulation model, constructing a disc type permanent magnet motor electromagnetic and thermal performance simulation model based on Motor-CAD and Maxwell software, and completing no-load, load and thermal performance tests of the motor. According to the method, the multi-physical field coupling simulation model is established in advance, so that comprehensive coupling analysis of electromagnetic and thermal performance of the disc type permanent magnet motor is realized, and high-precision data support is provided for multi-objective optimization; key structure parameters such as air gap length, slot opening width and the like are scientifically selected as optimization objects, maximization of motor efficiency and minimization of cogging torque are taken as core targets, and meanwhile, constraint requirements of output torque, back electromotive force and structure size are strictly adherent to each other, so that the pain point that multiple performances are difficult to consider at the same time in traditional optimization is effectively solved.

The invention relates to a high-dynamic motor control parameter real-time optimization method and system capable of reducing loss, and relates to the technical field of motor control parameter optimization, and the method comprises the steps: obtaining a current working condition parameter of a target motor, and collecting a control parameter of the target motor; performing clustering analysis based on the historical data to obtain a historical working condition clustering set; according to the control parameter prediction, obtaining a prediction loss value, obtaining an optimization target weight, and obtaining an initial control parameter weight; based on the optimization target weight, obtaining a dynamic optimization target, obtaining a control parameter influence degree, and adjusting and calculating to obtain a control parameter weight; the method comprises the following steps of: optimizing motor control parameters by taking a dynamic optimization target as a purpose and taking control parameter weights as constraints to obtain optimized control parameters, and optimizing the control parameters of the high-dynamic motor by adopting the optimized control parameters. According to the method, the problems of low motor efficiency and poor operation stability caused by easy neglect of loss and difficulty in adapting to dynamic working conditions in traditional motor control parameter optimization are solved.

The invention belongs to the technical field of new energy automobile transmission gear shifting control, and discloses an AMT gear shifting control method in an electric truck combined braking constant-speed downhill process, which comprises the following steps: judging whether a vehicle enters a combined constant-speed control state or not, and if the vehicle enters the combined constant-speed control state, selecting an AMT gear shifting rule based on a preset AMT gear shifting rule; the AMT optimal gear is obtained according to the current vehicle speed and the required regenerative braking torque, the limitation that only the motor efficiency is considered in a traditional method is broken through, the transmission system and the battery charging and discharging efficiency are synchronously covered, meanwhile, a braking torque cooperative change mechanism is creatively adopted, and the optimal gear is obtained. In the gear shifting process, braking force distribution of the motor and the hydraulic retarder is coordinated according to the preset AMT gear shifting rule, vehicle speed fluctuation caused by power interruption is eliminated, the energy loss and speed control instability risks caused by frequent gear shifting are overcome, driving comfort is guaranteed through gear shifting hysteresis control and the minimum vehicle speed threshold value, and safe and energy-saving closed-loop control is formed.

A self-adaptive cruise and torque distribution cooperative control method for a distributed driving electric vehicle comprises the following steps: establishing a two-degree-of-freedom vehicle dynamics model, combining a nonlinear tire model and a longitudinal load transfer effect, establishing a longitudinal motion control model, adopting a permanent magnet synchronous motor, introducing a motor efficiency MAP graph, and predicting a control algorithm by using a multi-target optimization model. And constructing a multi-state variable optimization model, dynamically adjusting a weight coefficient, introducing a relaxation factor, converting a problem into a quadratic programming problem, and generating an optimization control instruction. And designing a nonlinear model predictive controller to calculate an optimal direct yaw moment, determining a torque distribution coefficient, solving a target function for minimizing the total loss power of the motor through quadratic programming, and finding an optimal torque distribution coefficient to be applied to the motor. And a dynamic model, a longitudinal motion control model and a nonlinear model predictive controller are integrated to form a comprehensive vehicle control system and realize closed-loop control iteration, so that the safety, comfort and energy efficiency of the vehicle under complex working conditions are improved.

The invention provides a motor with heat dissipation fan blades, which comprises a motor cylinder and a motor rotating shaft, an end cover is arranged at the first end of the motor cylinder, a plurality of heat dissipation fins arranged around the motor rotating shaft are arranged on the outer cylinder wall surface of the motor cylinder, and a fan cover is arranged on one side, far away from the motor cylinder, of the end cover. The motor rotating shaft is provided with a first shaft section which extends into an air cavity formed between the fan cover and the end cover through the end cover, the first shaft section is sleeved with heat dissipation fan blades, the fan cover is provided with a connecting ring and an air inlet barrel body, the end cover is internally and externally sleeved with the connecting ring, the air inlet barrel body is matched with the heat dissipation fan blades, the inner diameter of the connecting ring is D1, and a blade top gap formed between the heat dissipation fan blades and the air inlet barrel body is G, 0.06 D1 < = G < = 0.89 D1. According to the invention, the fan blade loss is small, the cooling air flow with a higher flow rate can dissipate heat on the heat dissipation fins and the motor cylinder with higher efficiency, and meanwhile, the air supply heat dissipation distance is longer, and the heat dissipation effect on the motor can be further improved, so that the efficiency of the motor is improved.

The invention relates to the technical field of motor driving control, in particular to a multi-motor cooperative driving and torque distribution method and system, and the method comprises the steps: collecting motor rotating speed, current, battery SOC and whole vehicle driving condition data in real time, carrying out the preprocessing of the collected multi-source data, eliminating the noise interference, and carrying out the signal feature extraction; a torque demand model is established based on vehicle driving condition classification, and the target torque of the whole vehicle is calculated; constructing a torque distribution model fusing working condition weights, combining motor efficiency characteristics, a battery SOC state and road condition resistance, and dynamically distributing the torque of each motor through an improved particle swarm optimization algorithm; and the state of the motor is monitored in real time in the driving process, torque distribution data of this time is input into a database after the vehicle is driven, and the torque demand model and torque distribution model parameters are optimized. Through working condition identification, intelligent algorithm distribution and dynamic optimization, the driving safety of the electro-tricycle and the driving efficiency of the motor are improved.

To provide a motor unit having high motor efficiency.SOLUTION: A motor unit 100 used for an electric vehicle includes a substrate 150, a motor 110 having a connector 111a, and a connector 250a directly attached to the substrate 150. The terminal 111a and the connector 250a are connected to each other by inserting one into the other in a direction parallel to the rotation axis of the motor 110.SELECTED DRAWING: Figure 4

The embodiment of the application discloses an energy-saving control method and device for an electric truck and a medium. The method comprises the following steps: determining a preset reference motor efficiency high-efficiency area based on vehicle information of the electric truck; obtaining current road condition information and accelerator pedal opening degree information, and adjusting the preset reference motor efficiency high-efficiency area based on the current road condition information and the accelerator pedal opening degree information to obtain an actual motor efficiency high-efficiency area; starting a vehicle preset economy mode when the electric truck is in a non-full load state; obtaining a current rotating speed and a current torque of the electric truck when the vehicle is running in the vehicle preset economy mode; and adjusting a driving rotating state of the electric truck based on the actual motor efficiency high-efficiency area, the current rotating speed, the current torque and a preset double-speed-ratio drive axle, so as to realize energy-saving control of the electric truck. Through the above method, the vehicle energy-saving can be realized while the power performance of the vehicle is maintained.

The invention discloses a stator coil type coil for a high-voltage shielding motor, a manufacturing method, a stator and a motor, the coil type coil comprises a continuous coil body made of a conductive material, the coil body comprises two parallel long straight line segments, bevel edge segments connected with the two ends of the straight line segments, and nose parts located at the joints of the bevel edge segments; the turn-to-turn insulating layer and the ground insulating layer are coated outside the conductive material; the coil body forms an integrated full-mould-pressing structure through mould pressing forming, the mould pressing forming range covers all the straight line sections and the bevel edge sections connecting the straight line sections and the nose part, and the nose part is not covered by a mould. The problems of difficulty in coil inserting of high-voltage and small-size stators, poor insulation reliability, low motor efficiency and the like are solved.

This invention relates to the field of industrial visual inspection technology and discloses a visual inspection device for surface defects of stator and rotor laminations after fine grinding. It aims to solve the problems of neglecting burr detection on the lamination surface of existing stator laminations, and the issues of reflective interference, efficiency bottlenecks, and difficulty in balancing reliability and high cycle time in double-sided inspection. The device includes a conveying component, a support frame, a limiting component, a visual recognition component, and a projection lamp. By vertically conveying and positioning the motor stator and rotor laminations and fixing them with a V-shaped clamp, combined with a dual inspection method of projected shadows and direct imaging of the lamination surface, it overcomes reflective interference and reduces the risk of false positives and missed detections. The visual inspection sensor dynamically scans to achieve continuous inspection, improving inspection cycle time and throughput, adapting to large-scale online production, avoiding missed detections, preventing insulation damage during lamination, and ensuring motor efficiency, reliability, and service life.

This invention discloses a stator assembly, a motor, a compressor, and a refrigeration device, relating to the field of induction motor technology. The stator assembly includes a stator core and stator windings. The stator core has Q stator slots, which are divided into large slots and small slots according to their cross-sectional area. The stator windings include concentrically wound main windings and auxiliary windings. The main windings have m coils, and the auxiliary windings have n coils. The main windings are numbered B1, B2, B3...B according to their winding span from largest to smallest. m The secondary windings are numbered A1, A2, A3, ... A, according to their winding span from largest to smallest. n ;B2 to B m In the stator slots where the coils are located, there is at least one single main winding slot, and each single main winding slot contains only the main winding. At least one of the single main winding slots is a minor slot; 16≦Q≦32, 3≦m≦14, 3≦n≦12. The technical solution provided by this invention is used to reduce the harmonic ratio of the motor, thereby reducing motor heat generation and improving motor efficiency.

The application relates to the technical field of vehicle control, and provides a permanent magnet synchronous motor output torque calculation method, device and computer program product. The method comprises the following steps: acquiring three-phase phase current signals, a high-voltage bus voltage signal and three-phase bridge arm drive duty cycle signals; based on the high-voltage bus voltage signal and the drive duty cycle signal, three-phase phase voltage signals are calculated; based on a pre-calibrated delay time mapping table, a delay parameter is determined; the three-phase phase current signals and the three-phase phase voltage signals are subjected to delay processing by using the delay parameter; based on the synchronized phase current signals and the phase voltage signals, the instantaneous electric power of the motor is calculated; based on a pre-calibrated efficiency mapping table, a corresponding motor efficiency value is determined; based on the instantaneous electric power, the motor efficiency value and the motor rotating speed, the output torque of the motor is calculated. The application compensates for calculation errors caused by signal transmission path differences and motor nonlinear characteristics, and improves the calculation accuracy of the output torque.

The invention relates to the field of brushless coreless motors, in particular to a lap winding stator structure of a brushless coreless motor. A stator structure of a brushless coreless motor lap winding comprises a toothless and slotless annular stator lamination, the stator lamination and the stator lap winding are separated by insulation paper on the inner wall of the stator lamination, and the stator lap winding is a cylindrical coreless lap winding. The motor has the beneficial effects that the structure is novel, the design is ingenious and simple, the hollow cup stator laminations are not provided with stator teeth, and the stator teeth do not occupy effective internal space in the stator, so that the slot space factor of a stator winding is improved, the current density of the motor is increased, and the efficiency of the motor is improved; the hollow cup stator laminations have no stator tooth tips, so that the outer diameter of the rotor can be correspondingly increased, and the output power and torque of the motor are increased; the hollow cup stator laminations are not provided with notches, and the magnetic flux is very stable when the rotor permanent magnets rotate.

The invention discloses a motor, a compressor and refrigeration equipment, and relates to the technical field of motors, the motor comprises a stator iron core and a rotor iron core, a stator punching sheet of the stator iron core comprises a stator yoke and a plurality of stator teeth distributed along the inner circumference of the stator yoke at intervals, two adjacent stator teeth and the stator yoke enclose a stator slot, the number of the stator slots is Q, the maximum outer circle contour radius of the stator punching sheet is R1, and the minimum inner circle contour radius of the stator punching sheet is R2. The rotor core is formed by stacking a plurality of rotor punching sheets, the rotor punching sheets are provided with a plurality of magnetic steel grooves along the circumferential direction, magnetic steel is installed in the magnetic steel grooves, so that the rotor core forms a plurality of magnetic poles which are alternately distributed along the circumferential direction, the number of the magnetic poles is 2P, and the greatest common divisor of 2P and Q is N; 2.5 < = N * (R2 / R1) < = 3.5, and the unit of R1 and R2 is mm. The technical scheme provided by the invention aims to improve the magnetic flux and rotational inertia of the motor under each magnetic pole of the motor, and further improve the power density and efficiency of the motor.

The invention discloses a motor, a compressor and refrigeration equipment, and relates to the technical field of refrigeration equipment, the motor comprises a stator and a rotor, the rotor comprises permanent magnets and a rotor iron core, the rotor iron core is provided with a plurality of magnet grooves at intervals along the circumferential direction, the permanent magnets comprise a first permanent magnet, a second permanent magnet and a third permanent magnet, the magnet grooves comprise the first magnet groove, the second magnet groove and the third magnet groove, the first magnet groove, the second magnet groove and the third magnet groove jointly form a U shape, and the first magnet groove and the third magnet groove are communicated through the second magnet groove. The first permanent magnet, the second permanent magnet and the third permanent magnet are arranged in the first magnet groove, the second magnet groove and the third magnet groove respectively, the number of pole pairs of the rotor is P, the total number of the permanent magnets is 3P, and 3P is larger than or equal to 18 and smaller than or equal to 30. According to the technical scheme provided by the invention, the eddy-current loss in the permanent magnet is reduced, and the motor efficiency is improved.

This invention provides a flat wire motor stator, a flat wire motor, and a vehicle, relating to the field of vehicle technology. The flat wire motor stator includes stator windings and a stator core with stator slots. The stator windings include multi-phase windings, each branch of which is composed of multiple hairpin coils connected in series. The hairpin coils include same-layer hairpin coils and different-layer hairpin coils. The same-layer hairpin coils are positioned across the first and Mth layers of the stator slots, while the different-layer hairpin coils are positioned between adjacent slot layers in the middle layer of the stator slots. M / 2-1 different-layer hairpin coils are connected in series between two adjacent same-layer hairpin coils in the current direction. The span between the same-layer hairpin coils in the Mth layer is N / P-1, and the span between the different-layer hairpin coils and the same-layer hairpin coils in the first layer is N / P+1. The span between two adjacent hairpin coils in the current direction is N / P-1. This reduces the amount of copper and resistance of the flat wire windings, saves production costs, and improves motor efficiency.

This invention relates to the field of electric bus control, and particularly to a method, system, device, and medium for dual-motor coordinated control of an electric bus. The method involves acquiring multi-source state data of a pure electric bus during operation and constructing a working condition feature vector. Based on the working condition feature vector, historical operating data is subjected to working condition clustering analysis to establish a mapping relationship between working condition features and coordinated control parameters. A dual-motor coordinated control parameter optimization model is constructed, and under constraints of motor efficiency spectrum, battery power boundary, and system stability, the coordinated control parameters are optimized through multi-objective optimization to obtain the optimal coordinated control parameter vector. This enhances the adaptability of the vehicle control system under complex operating conditions, extends the service life of the motor and power system, improves the stability and reliability of the vehicle control system, reduces the impact of torque fluctuations, and improves passenger comfort.

The application discloses a simulation design method for energy-saving reconstruction of a permanent magnet synchronous reluctance motor, and aims to solve the problem of low matching degree of the existing reconstruction method and actual working conditions and limited energy efficiency improvement. The method collects and analyzes full working condition parameters, constructs a three-dimensional magnetic circuit-structure coupling simulation model, identifies key loss parameters and sets multi-dimensional constraint conditions, adopts multi-parameter collaborative optimization and an improved branch and bound method for optimization, and performs engineering adaptation and verification after screening the optimal scheme through simulation verification. The application realizes optimal energy consumption of the motor in full working conditions, improves the motor efficiency by more than 15% after reconstruction, and ensures that the power factor is not less than 0.92, and meanwhile, the reconstruction cost and resource utilization rate are considered, different types of motors are adapted, and scientific and efficient technical support is provided for large-scale energy-saving reconstruction of the permanent magnet synchronous reluctance motor.