528 results about "Cogging torque" patented technology

Disclosed is a low-precision incremental encoder-based method for ultra-low speed control of a servo system. According to the present invention, a fast speed observer in an ultra-low-speed working state is achieved, only a sampling speed and load torque in an M / T method need to be observed, and position information of an electric motor does not need to be observed, such that the structure of the observer is simplified, and calculation is simple and fast; moreover, the influence of a friction force and cogging torque on a speed change is considered, such that the speed observation precision is further improved. The fast speed observer can reduce hysteresis and measurement dead zones, such that the speed response and the speed control precision in a low-speed working state are greatly improved, the problem in a traditional observer of a large position deviation caused by nonlinear factors such as an external load is avoided, improving the stability and robustness of the system. According to the present invention, the processing of sampling measurement time at a medium-high speed and the processing of switching the observer at a low speed in the M / T method can optimize the speed measurement precision at both the medium-high speed and the ultra-low speed, and can better satisfy the requirements of apparatuses such as a radar on rotating speed control.

The invention provides a permanent magnet motor based on permanent magnet included angle optimization and a cogging torque suppression method thereof.The permanent magnet motor comprises a stator iron core, an armature winding, rotor iron cores and permanent magnets, and each pole of rotor iron core is provided with two sets of first V-shaped permanent magnet grooves and second V-shaped permanent magnet grooves which are symmetrical about the center line of the rotor iron core and are different in size; the permanent magnets are arranged in the first V-shaped permanent magnet grooves and the second V-shaped permanent magnet grooves respectively, the permanent magnets in the first V-shaped permanent magnet grooves and the second V-shaped permanent magnet grooves are arranged in a V-V shape, the included angle between the permanent magnets in the first V-shaped permanent magnet grooves is alpha, the included angle between the permanent magnets in the second V-shaped permanent magnet grooves is beta, and the permanent magnets in the first V-shaped permanent magnet grooves and the permanent magnets in the second V-shaped permanent magnet grooves are separated by the aid of an NSGA-II algorithm under the condition that the distance of the magnetic isolation bridge is unchanged. By adjusting the angle between the permanent magnets in the first V-shaped permanent magnet grooves and the second V-shaped permanent magnet grooves, the best matching combination of the small permanent magnet included angle alpha and the large permanent magnet included angle beta is optimized, and the arc-shaped auxiliary grooves are formed in the surface of the rotor iron core, so that the cogging torque of the permanent magnet motor is optimized.

The invention discloses a tooth splicing type high-voltage and high-speed motor stator and a design method, the tooth splicing type high-voltage and high-speed motor stator comprises a stator yoke and stator teeth, the stator teeth are uniformly distributed along the inner circumference of the stator yoke, and a stator slot for installing a winding is formed between adjacent stator teeth; the stator teeth are of an axisymmetric structure, the side edge of each stator tooth comprises a first contour molded line, a second contour molded line, a third contour molded line and a fourth contour molded line which are sequentially arranged in the radial direction of the stator, and the first contour molded lines of the adjacent stator teeth form winding installation areas. According to the invention, the stator teeth are designed to be detachable through the splicing structure, the line insertion of the formed winding can be smoothly carried out in the winding installation area formed by the first contour molded line, the groove width of the customized teeth can be ensured, and the stator teeth can be conveniently inserted in the winding installation area formed by the first contour molded line. The cogging torque is reduced, and the rotor eddy current loss of the motor is reduced.

The utility model relates to the technical field of motors, and discloses a servo motor and industrial automation equipment, the servo motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator iron core, the stator iron core comprises an annular stator yoke part iron core and a plurality of stator tooth part iron cores, a connecting part is arranged between two adjacent stator tooth part iron cores, and the stator yoke part iron core is connected with the rotor assembly. In the circumferential direction of the stator iron core, the length of the connecting parts is Bs, the maximum outer diameter of the stator yoke iron core is Rs, a plurality of # imgabs0 # stator tooth iron cores are evenly distributed in the circumferential direction of the stator yoke iron core, the connecting parts are arranged between every two adjacent stator tooth iron cores, notches can be eliminated, cogging torque and torque pulsation can be improved, and the service life of the stator yoke iron core is prolonged. And the width of the connecting part and the maximum outer diameter of the stator yoke iron core meet the relational expression: # imgabs1 # limits the width range of the connecting part, so that the requirement of eliminating a notch is met, and the influence of the connecting part on the performance of the motor is reduced.

The invention discloses a permanent magnet motor cogging torque analysis method considering iron core saturation. Different from an existing analysis method which does not consider iron core saturation, after the iron core saturation is considered, air gap magnetic conductance varies, a saturation coefficient is introduced, and a modulation unit is converted into stator slot and saturation coefficient combined modulation from stator slot independent modulation, so that harmonic components of air gap flux density are changed. The number of harmonic pole pairs and the rotating speed after the air gap flux density is changed are determined through Fourier decomposition, the traveling wave pair generating the cogging torque is found out according to the cogging torque generation condition of the same number of pole pairs and different rotating speeds, and effective supplement is made for an existing cogging torque analysis method.

The invention discloses an axial winding complementary type hybrid excitation high-speed magnetic flux reverse motor, and belongs to the technical field of power generation, power transformation or power distribution. The motor comprises a six-slot stator iron core, a four-tooth rotor iron core, a set of annular winding serving as an excitation winding and a set of concentrated winding serving as an armature winding, permanent magnet groups are attached to the inner surface of the tooth part of the stator core, two groups of axial permanent magnets are opposite in polarity, and two groups of circumferential permanent magnets are opposite in polarity; and the rotor iron core is formed by laminating a plurality of rotor iron core sections which have a mechanical angle of 45 degrees in the axial direction. The motor has the magnetic field adjusting capacity and has the advantages of being small in flux linkage, counter electromotive force sine, cogging torque and torque fluctuation, extra rising voltage caused by strong armature reaction during high-speed operation can be reduced through flux weakening, torque during low-speed operation can be improved through flux increasing, and due to the fact that the number of poles is small, loss is small during high-speed and high-frequency operation, and the motor is high in reliability. Compared with other magnetic flux reverse motors, the magnetic flux reverse motor is more suitable for high-speed operation.

The invention relates to a flywheel energy storage motor structure optimization method and device based on an improved hedera helix algorithm. The method comprises the following steps: acquiring upper and lower limits of slot depth, upper and lower limits of slot width and cogging torque of the flywheel energy storage motor; taking a peak-to-peak value calculation formula of the cogging torque as a target function; each individual is set to comprise two dimensions of groove depth and groove width, the fitness of each individual is a value of an objective function, and an initial population is obtained through cubic chaotic mapping in a solution space; the growth rate and the fitness of each individual are calculated under the current iteration times, and the individual with the minimum fitness is selected as the current optimal individual; calculating the temporary position of the corresponding individual, correcting the temporary position by using the adjustment vector to obtain a corrected position, updating according to the corrected position, and calculating the fitness of each individual after the position is updated; and when iteration is ended, selecting the groove depth and groove width corresponding to the individual with the minimum fitness from the individuals after position updating as optimal solutions of the optimization variables. The method can improve the performance of the flywheel energy storage motor.

The invention relates to the technical field of motors, in particular to a permanent magnet motor and magnetic steel fixing structure which comprises a shell, a protection mechanism and a locking mechanism, one end of the shell is connected with a first protection net through a bolt, the other end of the shell is connected with an inner end cover through a bolt, and one end of the inner end cover is connected with an outer end cover through a bolt. One end of the shell is provided with a second protective net, the inner wall of the shell is uniformly provided with stator punching sheets, and one end of the shell is connected with fan blades through a bearing. According to the device, a built-in heat dissipation mode is adopted for heat dissipation work, so that the heat dissipation efficiency can be improved, load protection can be carried out, the use safety of the device is further improved, loss is reduced, meanwhile, high-precision and stable self-locking can be carried out, the safety and precision of working parts are guaranteed, and the service life of the device is prolonged. And no-load cogging torque ripple and load torque ripple ripple can be improved, the performance of the device is further improved, the energy consumption loss is reduced, and the operation stability is improved.

The invention discloses an outer rotor permanent magnet synchronous motor torque optimization method, which comprises the following steps: 1) design parameter selection: selecting key characteristics of a motor stator slot as design parameters, including slot shoulder height Hs1, tooth length Hs2, chord length Bs0 and slot shoulder width Bs1; 2) finite element model construction: establishing a multi-target finite element model with cogging torque, torque pulsation and average torque as targets; 3) establishing an analytic model: establishing the analytic model of the motor torque by using an energy method and a repetitive unit method, and comparing the analytic model with the finite element model to verify the accuracy of the analytic model; 4) response surface model construction: based on the simulation data of the finite element model, performing finite element analysis by adopting a central composite design CCD, constructing a response surface model, performing sensitivity analysis on design variables, and determining the influence of each variable on an optimization target; and 5) optimization efficiency improvement: determining optimal configuration in a design space by using an adaptive genetic aggregation algorithm AGA, and achieving a multi-objective optimization effect.

The invention relates to the technical field of motors, in particular to a method for positioning the flat position angle of a motor rotating shaft through cogging torque, and the method comprises the following steps: designing and manufacturing a die head with a positioning function; mounting the stator core and the die head in a matched manner, and positioning the stator core; mounting the casing and the die head in a matching manner, and positioning the angle after the casing and the stator core are assembled; a motor rotating shaft flat position in the rotor structure is fixed opposite to the center of the magnetic pole; and assembling all the assembled motor assemblies into a finished motor. After the motor is assembled, the rotating shaft of the motor is rotated for one circle under the condition that the winding is not electrified, and the flat positions of the rotating shaft of the motor are respectively locked at 12 positions of 0 degree, 30 degrees, 60 degrees, 90 degrees, 120 degrees, 150 degrees, 180 degrees, 210 degrees, 240 degrees, 270 degrees, 300 degrees and 330 degrees. Compared with the prior art, the method for positioning the flat position angle of the rotating shaft of the motor by utilizing the cogging torque has the advantages that the flat position of the rotating shaft can be locked by utilizing the positioning torque, namely the cogging torque, of the motor when a motor winding is not electrified, so that the flat position of the rotating shaft of the motor is fixed at several appointed positions according to design requirements; the product design requirement is met, the structure complexity and the software control algorithm difficulty are reduced, the cost is reduced, the efficiency is improved, and the product market competitiveness is improved.

The invention relates to an assembly method of a motor, a vehicle and a rotor, the motor comprises a shell, and a stator core, a stator winding and a rotor which are arranged in the shell, two end surfaces of the stator core are respectively provided with a stator groove, and the stator winding is arranged in the stator groove; rotors are arranged at the two ends of the stator core respectively, each rotor comprises a back plate, a pressing plate and a sheath, and a soft magnetic composite element is fixed on each back plate; the pressing plate is arranged on the back plate and is used for fixing a plurality of magnetic steels; each magnetic steel is of an asymmetric structure relative to the radial direction of the rotor; the sheath sleeves the peripheries of the plurality of magnetic steels. Therefore, the magnetic steel is designed into an asymmetric structure, and the magnetic steel outer ring and the magnetic steel inner ring are staggered at a certain angle in the circumferential direction, so that the cogging effect can be effectively reduced, the cogging torque and the torque pulsation of the motor are reduced, and the NVH performance of the motor is improved. And meanwhile, the soft magnetic composite element is additionally arranged in the rotor, so that iron loss and eddy-current loss can be reduced.

The invention relates to the field of motor structure design and optimization, and discloses a cogging torque and torque ripple optimization method for a permanent magnet motor for a vehicle. The method comprises the steps that based on an electromagnetic scheme, a geometric boundary and a term dictionary, a parameterized geometric prototype containing four symmetric semi-arc auxiliary grooves is constructed, and a design variable set structure is generated; converting the structure into a target evaluation interface structure containing a target item and a constraint item; an improved adaptive particle swarm algorithm is combined with finite element rapid check and a new iteration function to carry out optimization solution, and an updated candidate group structure is generated; and finally, optimal parameters are screened through Pareto sorting and robustness recheck, and an engineering configuration structure is generated. According to the method, through systematic parameter modeling, an efficient collaborative optimization algorithm and simulation evaluation, the optimization efficiency and reliability are remarkably improved, the cogging torque and the torque ripple of the motor are effectively reduced, and meanwhile, the process feasibility and the performance robustness of a design scheme are ensured.

The invention discloses a data-driven linear electric joint cogging torque compensation and evaluation method for a humanoid robot, and belongs to the technical field of control of linear electric joints of humanoid robots. The problems that an existing humanoid robot linear joint cogging torque compensation method is long in consumed time, difficult to operate and poor in precision are solved. According to the invention, the motor rotates a circle in the forward direction and the reverse direction respectively, the forward current and the reverse current are sampled, and the position of the motor and the corresponding current at the position are recorded at the same time; determining the number of sampling points in the sampling time according to the rotating speed of the motor, calculating the number of position points of the motor, obtaining a mapping relation between forward and reverse currents and the position of the motor, and representing the position points of the motor by using the forward and reverse currents; based on the relation between the cogging torque and the forward current and the reverse current, the mapping relation between the position, represented by the forward current and the reverse current, of the motor and the corresponding cogging torque is obtained, and then iterative compensation is conducted on the joint cogging torque based on the position, represented by the forward current and the reverse current, of the motor and the corresponding cogging torque mapping relation.

The invention discloses a permanent magnet synchronous motor cogging torque suppression method and device based on coordinate analysis, and belongs to the technical field of permanent magnet synchronous motors, and the method comprises the steps: effectively suppressing the cogging torque of a permanent magnet synchronous motor through collaborative optimization of the geometric parameters of stator and rotor auxiliary slots, reducing the torque pulsation, and improving the vibration noise, thereby improving the cogging torque of the permanent magnet synchronous motor. The comprehensive performance of the motor is improved. Wherein the stator auxiliary slots weaken periodic components related to stator tooth slots in air gap magnetic conductance harmonic waves by adjusting slot widths and depths, and excitation of the periodic components to tooth slot torque is reduced; the rotor auxiliary grooves optimize the pole-arc coefficient by adjusting the opening angle, and remanence harmonic waves of the permanent magnets are inhibited from being periodically matched and coupled with the stator tooth grooves. The collaborative design of the two enables the amplitudes and phases of air-gap magnetic conductance harmonic waves and permanent magnet residual magnetic harmonic waves to be mismatched, the amplitude of cogging torque is remarkably reduced, meanwhile, periodic disturbance of an air-gap magnetic field is reduced, the output torque is more stable, and mechanical vibration and noise caused by electromagnetic force fluctuation are synchronously weakened.

The invention discloses a permanent magnet brushless direct current motor and a parameter optimization method thereof. A rotor adopts a regular hexagon structure, and permanent magnets are alternately embedded into the rotor. Seven parameters such as the maximum thickness of a permanent magnet, a pole-arc coefficient and the width of a stator notch are selected for optimization, air gap flux density, no-load back electromotive force and no-load cogging torque are taken as optimization targets, a response surface model of a multi-objective function is constructed, parameter weights of the multi-objective function are determined in combination with a CRITIC weight analysis method, the motor parameters are optimized by adopting an improved MOEA / D algorithm, and the optimal parameters of the multi-objective function are obtained. And carrying out crossover variation on the population by directional variation guided by electromagnetic characteristics, and designing a weight vector optimization Chebyshev aggregation method to find an optimal iteration population. According to the weight in the Chebyshev aggregation function designed by the invention, the problems that the traditional Chebyshev aggregation method is not smooth enough for the continuous MOP problem and the obtained solution is not uniform are solved, and the distribution uniformity of the Pareto solution set is optimized. The method has obvious advantages in the aspects of convergence speed, solution set distribution and engineering feasibility.

The invention provides a permanent magnet synchronous motor and a vehicle. The permanent magnet synchronous motor comprises a stator structure and a rotor structure, the rotor structure is sleeved with the stator structure, the stator structure comprises a stator iron core (1), the rotor structure comprises a rotor iron core (3), the stator iron core (1) comprises stator grooves (2), the stator grooves (2) comprise first stator grooves (21) and second stator grooves (22), and the first stator grooves (21) and the second stator grooves (22) are arranged in one pole. When the d-axis of the rotor structure coincides with the magnetic pole center line of the stator structure, the first stator grooves (21) are located on the two sides of the q-axis of the permanent magnet synchronous motor and are adjacent to the q-axis, the second stator grooves (22) are located between the two first stator grooves (21) on the two sides of the d-axis, the notch width of the first stator grooves (21) is B1, the notch width of the second stator grooves (22) is B0, and B1 is smaller than B0. According to the permanent magnet synchronous motor, the cogging torque of the motor and the torque pulsation of the motor can be reduced, the harmonic content of the motor is reduced, and the noise and vibration of the motor are reduced.

The invention discloses a rotor punching sheet, a motor, a compressor and refrigeration equipment, the rotor punching sheet comprises a punching sheet body, the end face of the punching sheet body is provided with a plurality of structure groups, each structure group comprises a first magnetic isolation groove, a magnetic isolation bridge and a mounting groove, the mounting groove is internally provided with a permanent magnet, and the length of the permanent magnet is w1; a mounting groove is formed in the punching sheet body, a first magnetic isolation groove is formed between each of two ends of the mounting groove and the outer peripheral surface of the punching sheet body, so that a magnetic isolation bridge is formed between each first magnetic isolation groove and the outer peripheral surface of the punching sheet body, the length of the magnetic isolation bridge is w2, and the relation range of w1 and w2 is that w2 / w1 is greater than or equal to 0.3 and less than or equal to 0.6. According to the technical scheme, on the premise that the mechanical structure strength of the rotor is guaranteed, the optimal pole-arc coefficient of the motor can be achieved, the no-load back electromotive force harmonic distortion rate, the cogging torque and the torque pulsation of the motor are reduced, the noise vibration of the motor is reduced, and the magnetic leakage is reduced, so that the performance of the motor is improved.

The invention relates to the field of servo motors, and discloses a motor rotor iron core and a motor cogging torque reduction method and device.The motor rotor iron core of a hemispheroid-like structure is composed of an iron core buckling point structure and a permanent magnet ring, and the outer contour of the bottom of the motor rotor iron core is a circle-like shape formed by connecting a plurality of three-section type geometric lines; the rotor has a unique three-section type rotor core excircle structure. According to the structure, the cogging torque can be reduced, the back electromotive force waveform sinusoidal property of the motor can be improved, the pole-arc coefficient is optimized by changing the circumscribed included angle between the straight line section and the arc section and the eccentric distance between the center of the arc section and the center of the rotor core, and the design target is completed through finite element analogue simulation analysis. Finally, the effects of reducing the cogging torque of the motor, improving the sine property of the back electromotive force waveform and guaranteeing the positioning and control precision of the motor are achieved.

The invention discloses an alternating current permanent magnet synchronous servo motor cogging torque testing device and method, and relates to the technical field of cogging torque tests.The alternating current permanent magnet synchronous servo motor cogging torque testing device comprises a machine body, a load end, an output end, an output end, an output end, an output end and a cogging torque testing end, the load end dynamically adjusts the load weight of a circle after the motor rotates according to the motor torque pulse data; the controllable resistance unit is arranged in the load end, the corresponding load weights when the motor rotates to different angles are adjusted by adjusting the resistance of the load end rotating to different angles, the correction structure is arranged on one side of the rotation direction of the motor of the controllable resistance unit, and the resistance change precision is determined by correcting the resistance change of the controllable resistance unit. According to the adjustable dynamic load, repeated measurement of the servo motor is realized through adjustment of multiple load changes, and the weight of the load is continuously adjusted in the measurement process.

The embodiment of the invention discloses a motor and oral cavity cleaning equipment. The motor comprises a stator assembly and a rotor assembly, the stator assembly comprises at least one pair of stator core bodies; the rotor assembly comprises a power shaft and a magnet assembly; the stator core body can drive the rotor assembly to vibrate in a reciprocating manner in a power-on state; when the stator assembly is not electrified and the rotor assembly is not subjected to external force, the rotor assembly is in the balance position. The rotor assembly is located at an unbalanced position when being subjected to external force, and the rotatable angle of the rotor assembly is larger than 360 degrees when being subjected to the external force; and when the external force is removed, the rotor assembly is reset to the balance position under the action of the cogging torque. Due to the fact that the rotor assembly can rotate by any angle under the action of external force and can reset to the balance position after the external force is removed, a user can manually rotate the brush head connected with the rotor assembly to any needed balance position or the position close to the balance position according to needs, and the convenience of using the oral cavity cleaning equipment by the user is improved.

The invention relates to a stator structure of a magnetic suspension permanent magnet synchronous motor and a design method thereof. The stator comprises a stator core, and the stator core comprises a central hole, an inner side groove and an outer side groove. The multiple inner side grooves extend outwards in the radial direction of the center hole and are distributed at intervals. The plurality of outer side grooves extend inwards in the radial direction along the edge of the stator core and are distributed at intervals; the outer side grooves and the inner side grooves are correspondingly arranged in number and position; one side of each coil in the winding is arranged in the inner side groove, and the other side of each coil in the winding is arranged in the corresponding outer side groove. The invention provides a stator structure of a magnetic suspension permanent magnet synchronous motor and a design method thereof, and aims to shorten the end part of a winding, reduce the axial length of the motor, and determine the optimal distance between inner and outer slots of the stator, the width of the outer slot, the width of the outer slot opening and the depth of the outer slot opening by utilizing a fruit fly optimization algorithm. Therefore, collaborative optimization of the stator flux density, the cogging torque and the average torque is achieved.

The invention provides a cogging torque automatic testing device which comprises a base, three lifting assemblies are connected to the base in a sliding mode, the three lifting assemblies are connected into the same rail in a sliding mode, and a tested prototype, a torque sensor and a servo motor are sequentially installed on the three lifting assemblies distributed in the length direction of the rail respectively. The lifting assembly is provided with a centering clamping assembly corresponding to the torque sensor, the tested sample machine or the servo motor. The device is reasonable in design, effectively solves the problem that the axial center line of each device is inconvenient to adjust to the same height through the lifting assembly, effectively clamps a torque sensor, a tested prototype and a servo motor through the centering clamping assembly, guarantees that the axial center lines of the devices are collinear, provides a powerful guarantee for the stability of automatic cogging torque testing, and improves the testing efficiency. And specialized testing work is facilitated.

To provide a rotor and a motor that can reduce cogging torque.SOLUTION: A rotor RT includes: ten magnet parts MG; and a rotor core. The ten magnet parts MG are arranged in a circumferential direction around a central axis extending in a vertical direction. The rotor core includes a plurality of magnetic pole parts 61. Each magnet part MG is housed in a magnet arrangement part SP1. The magnet arrangement part SP1 is provided between adjacent ones of the magnetic pole parts 61. A radially outer surface 62 of the magnetic pole part 61 has: an arc part 622; and a peripheral part 624. The arc part 622 has a radius of curvature about the central axis. The peripheral part 624 extends from a circumferential end of the arc part 622. The peripheral part 624 is an arc having a radius of curvature different from that of the arc part 622 or a straight line. The width of the arc part 622 is A. The width of the peripheral part 624 is B. A ratio represented by A / (A+B×2) is 0.64 or more and 0.8 or less. The peripheral part covers a surface of a corner part of a magnet part for which a direction of the central axis is a normal direction.SELECTED DRAWING: Figure 2B

The invention provides a composite groove type stator punching sheet and a motor formed thereof.The stator punching sheet comprises M composite grooves distributed in the circumferential direction of the stator punching sheet, each composite groove comprises a first winding groove and a second winding groove which are distributed along the two sides of the center line of the groove, and the first winding grooves and the second winding grooves are different in structure; the inner side wall of the first winding groove comprises at least one section of arc, and the inner side wall of the second winding groove does not comprise an arc and is only enclosed by straight lines; m is an integer greater than or equal to 3. The first winding slots effectively modulate an air-gap magnetic field by utilizing smooth arc-shaped contours of the first winding slots, so that cogging torque and torque pulsation caused by magnetic conductance change are greatly reduced; the second winding groove is used for enhancing the magnetic circuit capacity and ensuring that the main magnetic flux can pass through efficiently without saturation, so that the harmonic content and the stator iron loss are greatly reduced; the first winding groove and the second winding groove complement each other in the aspects of electromagnetic performance and process advantages and are synergistically enhanced, so that a high-performance and low-cost synergistic effect is realized.

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 discloses a 12000-turn range extender generator for an electric aircraft, which adopts a mode of 24-slot and 20-pole inner rotor and radial insertion of seven-section rotor iron core skewed slot magnetic steel, and has the excellent performances of symmetrical magnetomotive force waveform, high winding coefficient, low torque ripple and cogging torque and no end ring current. The motor adopts a centralized winding, winding oil cooling and shell water cooling mode, and is suitable for a generator for a range extender of an electric aircraft.

The invention relates to the technical field of motors, and discloses a reluctance-assisted permanent magnet synchronous motor and an assembly thereof. The reluctance-assisted permanent magnet synchronous motor comprises a casing, and two groups of end covers are fixedly mounted at the front end and the rear end of the casing. According to the reluctance-assisted permanent magnet synchronous motor and the assembly thereof, in order to enable the motor body to operate more stably and lower noise, the movement mechanism is arranged, a wire on each stator winding can serve as a loop of any two other input wires, each group of stator pieces can form an independent magnetic field, and the three groups of stator pieces alternately generate a magnetic field, so that the motor body is more stable in operation and lower in noise. When the motor body operates, the rotor piece synchronously rotates along with the rotation of the stator piece, a shunt magnetic conduction structure is adopted, so that the cogging torque is eliminated, and the built-in magnetic steel is adopted, so that the effects of low speed, large torque, weak magnetic field and high speed are achieved by fully utilizing the magnetic resistance torque. Therefore, the motor body is more stable in operation and lower in noise.

The invention discloses a rotor punching sheet and a rotor structure of a low-harmonic permanent magnet motor, and the rotor punching sheet comprises a rotor punching sheet body, each magnetic pole unit is symmetrically provided with a first V-shaped magnetic steel groove and a second V-shaped magnetic steel groove, and the first V-shaped magnetic steel groove is located between a shaft hole and the second V-shaped magnetic steel groove; a first auxiliary groove, a second auxiliary groove and a third auxiliary groove are formed in the outer circle of the rotor, and the auxiliary grooves in the unit magnetic poles are symmetrically distributed about the d-axis center line. The first auxiliary groove is located between the q-axis center line and the first V-shaped magnetic steel groove, the second auxiliary groove is located between the first V-shaped magnetic steel groove and the second V-shaped magnetic steel groove, and the third auxiliary groove is located between the second V-shaped magnetic steel groove and the d-axis center line. Three pairs of auxiliary grooves are formed in the outer circle of the rotor, and by reasonably designing the topological structure of the double-V-shaped rotor and the shapes and the positions of the auxiliary grooves of the rotor, the distribution of an air-gap magnetic field is optimized, the magnetic field harmonic waves of the motor are weakened, the cogging torque and the torque pulsation of the motor are reduced, and the vibration noise of the motor is improved.

The invention discloses a split embedded magnetic circuit optimization design process, and belongs to the technical field of motor design and manufacturing. According to the invention, a split embedded magnetic circuit optimization design process is adopted, and the embedded combination design of a high-resistance magnetic material and a high-permeability magnetic material is utilized, so that the cogging torque of the motor and the magnetic isolation groove structure of the permanent magnet rotor can be effectively improved, the magnetic circuit is optimized, the magnetic leakage is reduced, and meanwhile, the mechanical property is ensured.

The utility model discloses a permanent magnet synchronous motor which comprises a rotor, a stator and a rotating shaft, the rotating shaft is arranged at the circle center of the rotor in a penetrating mode, the rotor is embedded in the stator, the middle section of a tooth portion of the stator is arranged in an arc shape, the two ends of the tooth portion of the stator are arranged in a flat cutting mode, and air gaps of the stator and the rotor are arranged in an uneven mode. The permanent magnet synchronous motor comprises a rotor and a stator, the outer circle of the rotor is of a two-section chamfering structure, permanent magnets of a V-shaped structure are arranged in the rotor, and the permanent magnets are distributed at intervals in the circumferential direction of the rotor, according to the permanent magnet synchronous motor, the pole-arc coefficient and the effective air gap length of the motor are adjusted through the outer circle shape of the rotor and the tooth tip shape of the stator, and therefore the motor efficiency is improved. Therefore, the air gap flux density harmonic amplitude is reduced, and the cogging torque and the torque ripple of the motor are reduced.