224 results about "Cogging torque" patented technology

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 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 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.

The utility model discloses a motor stator and a motor, and relates to the technical field of motors, the motor stator comprises a stator tooth module, a stator yoke module and a plurality of winding coils, the stator tooth module comprises a plurality of stator tooth modules which are sequentially connected along the circumferential direction of the motor stator, each stator tooth module comprises at least one stator tooth, and the winding coils are wound around the stator tooth module. Any two adjacent stator teeth are arranged at intervals along the circumferential direction of the motor stator to form stator slots; the stator yoke module comprises a plurality of stator yoke modules which are sequentially connected along the circumferential direction of the motor stator, and the plurality of stator yoke modules jointly surround the periphery of the stator tooth module and seal the openings of all stator slots; the winding coils are correspondingly accommodated in the stator grooves; wherein the stator tooth module and the stator yoke module are spliced into a whole. The utility model aims to effectively avoid the problems of serious air-gap magnetic field distortion, large cogging torque and torque pulsation, large stray loss, high temperature rise and high noise of the open slot of the high-voltage motor caused by cogging effect.

Provided in the present application are a rotor lamination and a forming method therefor, a rotor iron core, a servo motor and a robot. The rotor lamination comprises a lamination body (1), the lamination body (1) having a rotor outer circumference (2); under one pole, the rotor outer circumference (2) of the lamination body (1) is provided with a groove (3) recessed inwards relative to the rotor outer circumference (2) and / or a protrusion (4) protruding outwards relative to the rotor outer circumference (2). According to the rotor lamination of the present application, the stamping precision of the outer contour of the rotor lamination can be improved, allowing a reduction in the cogging torque and torque ripple of the electric motor, and thereby improving the positioning accuracy of the robot.

The utility model discloses an axial magnetic flux motor which comprises a rotor and a stator, the rotor comprises a plurality of magnets which are annularly arranged at intervals, the stator is arranged in the axial direction of the rotor, the stator comprises a stator iron core, the stator iron core comprises a plurality of iron core blocks which are annularly arranged at intervals, and air gaps are formed between the iron core blocks and the magnets. And the air gap is gradually widened from the center of the air gap to the two circumferential sides of the air gap. According to the technical scheme, the air gap between the iron core block and the magnet is designed to be gradually widened in the direction from the center of the iron core block to the two circumferential sides, so that the non-uniform air gap is formed, the back electromotive force waveform of the axial flux motor is improved, the harmonic content is reduced, the efficiency of the axial flux motor is improved, the cogging torque and the torque pulsation are reduced, and the service life of the axial flux motor is prolonged. And the performance is improved.

The application discloses a motor and a household appliance, and belongs to the technical field of motors. The motor comprises a stator assembly and a rotor assembly. The rotor assembly comprises a rotor core and a plurality of magnets. The rotor core is provided with a plurality of magnet grooves. Rotor punching sheets are stacked along the axial direction of the rotor core to form at least one first core section and at least one second core section. Along the circumferential direction of the rotor core, each first core section comprises a plurality of first sector blocks arranged at intervals, each second core section comprises a plurality of second sector blocks arranged at intervals, each core unit comprises a plurality of first sector blocks and a plurality of second sector blocks arranged in layers, a first outer magnetic bridge is protruded on the first side of the outer circumferential edge of each first sector block, a second outer magnetic bridge is protruded on the second side of the outer circumferential edge of each second sector block, the first outer magnetic bridge and the second outer magnetic bridge are arranged at different positions along the axial direction of the rotor core, and the effect of a segmented skew pole of the rotor is formed. The above structure can reduce the cogging torque and torque fluctuation of the motor.

The purpose of the present invention is to reduce the cogging torque of an electric motor. The motor is provided with: a stator (20) formed by welding a plurality of split iron cores (21); and a rotor disposed so as to face the stator (20), the rotor having a first region (R1) as a region from an axial end of the stator (20) to a terminal end of a continuous welded portion (22) closest to the axial end, and a second region (R2) as a region other than the first region (R1) and including an axial center portion of the stator (20). In at least one of the plurality of joining parts (J) between the plurality of divided iron cores (21), the proportion of the welded parts in the second region (R2) is smaller than the proportion of the welded parts (22) in the first region (R1).

The application provides a low-noise motor optimization method based on multi-parameter variable fusion, and the specific process is as follows: taking motor back electromotive force variation and minimum slot torque as an optimization objective function; taking motor rotor magnetic pole circular arc wrap angle as an optimization variable, and multiple iterations of the magnetic pole circular arc wrap angle are carried out in a set range, the magnetic pole circular arc wrap angle corresponding to the minimum objective function is taken as an optimal parameter of the motor, and low-noise motor optimization is realized; the magnetic pole circular arc wrap angle is proportional to the magnetic pole circular arc length. In the method, the magnetic pole circular arc wrap angle is taken as an optimization object, and the optimization design can be quickly and effectively completed, and the low-noise motor for vehicles can be developed.

The application relates to a pole shoe mounting and positioning structure of a motor, which comprises a stator core, the stator core comprises a plurality of stator teeth, a coil is sleeved on the stator teeth, a pole shoe is mounted at the end of the stator teeth, and a plurality of insulating baffle plates are inserted into the gap between the inner circumferential surface of the coil and the side surface of the stator teeth, the two side surfaces of each stator tooth are provided with the insulating baffle plates, and the insulating baffle plates are in contact with the pole shoes; the insulating baffle plate comprises an insertion part and a baffle part, the width of the baffle part is larger than that of the insertion part, a plurality of guide inclined surfaces are formed on the insertion part, and the baffle part presses the pole shoe after the insertion of the insulating baffle plate is completed. Compared with the prior art, the opening of the stator slot is reduced in the mounting of the pole shoe, torque fluctuation is reduced, tooth slot torque is reduced, radial force fluctuation is reduced, and the motor NVH performance is improved; the simple and low-cost insulating bamboo stick can make the coil winding firm, fill the gap, increase the insulation reliability, and prevent the pole shoe from slipping due to the motor vibration.

The invention discloses a stator and rotor punching sheet for a permanent magnet synchronous motor and a motor, and relates to the technical field of permanent magnet synchronous motors, the stator and rotor punching sheet comprises a stator and a rotor, the rotor is formed by splicing a plurality of rotor punching sheets, and the rotor comprises a second rotor punching sheet forming a constant air gap with the stator, a first rotor punching sheet and a third rotor punching sheet, and the first rotor punching sheet and the third rotor punching sheet form a non-uniform air gap with the stator. The rotor is a three-section type rotor, the circular truncated cone-shaped rotors are symmetrically arranged on the two sides of the middle cylindrical rotor, three groups of air gaps are formed on the inner side of the stator, and cogging torque and torque pulsation can be reduced through mutual cooperation of the circular truncated cone-shaped rotors and the inner side of the stator. The magnetic steel grooves of the rotor are respectively V-shaped and double-V-shaped, so that the harmonic magnetic field content of the rotor can be improved, the noise can be reduced, the comprehensive cost can be reduced by the V-shaped magnetic steel grooves, and the power density can be improved by the double-V-shaped magnetic steel grooves.

To provide a silicon steel sheet for a motor of a range hood that improves the problems of the existing motor winding structure, such as high production costs, a tendency to generate vibration noise, and relatively poor magnetic flux stability. [Solution] The range hood motor silicon steel plate (10) includes an outer ring (11), a plurality of first teeth (12), and a plurality of second teeth (13). The plurality of first teeth protrude radially from at least a portion of the inner peripheral surface of the outer ring, and the plurality of second teeth protrude radially from another portion of the inner peripheral surface of the outer ring. The inner peripheral surface of the outer ring includes at least one spaced apart tooth arrangement main edge (111) and at least one tooth arrangement sub-edge (112). By controlling the angles of the main angle (S1) formed by the tooth arrangement main edge and the sub-angle (S2) formed by the tooth arrangement sub-edge, as well as by controlling the dimensions and geometric structure of the first and second teeth, it is possible to significantly reduce the generation of cogging torque and abnormal noise, while also effectively reducing the amount of conductive coil used, thereby lowering production costs and achieving a lighter motor.

This invention provides an electric motor, an electric power steering system, and a vehicle. The motor includes a stator core, a rotor core, and an air gap. The rotor core is located inside the stator core, and the air gap is located between the rotor core and the stator core. The axial height Ls of the stator core, the outer diameter Dso of the stator core, the stator split ratio k of the stator core, the axial height Lr of the rotor core, and the width lg of the air gap satisfy the following: This application optimizes the dimensional relationship between the stator core, the rotor core, and the air gap between them. Without increasing the number of components, it effectively solves the problem of motor performance degradation caused by end magnetic leakage, thereby reducing cogging torque, suppressing torque pulsation, increasing the average torque of the motor, and improving motor vibration and noise. While ensuring motor performance, it can minimize motor weight and reduce production costs.

The invention provides a rotor structure and a motor, magnet grooves comprise two first magnet grooves and two second magnet grooves which are communicated with each other, the two second magnet grooves are located between the two first magnet grooves, and two sides of a D shaft of a magnetic pole are respectively provided with one first magnet groove and one second magnet groove; a first V-shaped groove with an opening deviating from the central point of the rotor core is formed between the two second magnet grooves, and a second V-shaped groove with an opening facing the central point of the rotor core is formed between the adjacent first magnet groove and the second magnet groove; wherein a plurality of magnetic barrier holes are formed between the first V-shaped grooves and the outer peripheral wall of the rotor core, and a plurality of auxiliary grooves are formed in the outer peripheral wall, corresponding to the second V-shaped grooves, of the rotor core; while the high salient pole ratio is ensured, the cogging torque is reduced, magnetic flux leakage and higher harmonics are inhibited, and meanwhile, the power density and efficiency of the motor are not influenced.

This invention provides a method for suppressing cogging torque in a permanent magnet synchronous motor based on FxLMS, ​​comprising the following steps: The unfiltered torque demand waveform output from the PI speed loop is obtained; the torque demand is processed by a static low-pass second-order Butterworth filter to obtain a filtered torque demand waveform; the torque demand is simultaneously processed by a static high-pass second-order Butterworth filter to obtain a waveform containing only the cogging torque component, forming a noise reference signal; this signal is input into a modified FxLMS filter to obtain an anti-noise signal; this signal is input to a summing module and superimposed with the filtered torque demand waveform to generate a combined torque demand for cogging torque cancellation; the combined torque demand is input to a gain module to generate a q-axis current reference value; this reference value is input to the PI current loop; the combined torque demand is simultaneously fed back to the PI speed loop and combined with the actual speed error of the motor to generate a new torque demand value; the system then returns to the beginning, forming a closed-loop operation.

The present invention relates to a control method and control apparatus for a permanent magnet synchronous motor. The control method comprises: a compensation measurement step, which comprises: by means of an experimental test performed in advance, measuring and calculating a plurality of cogging torques of a rotor at a plurality of rotation positions within a rotation cycle, and generating a lookup table that represents mapping relationships between the plurality of rotation positions and the corresponding plurality of cogging torques; and a compensation application step, which comprises when a permanent magnet synchronous motor is operating, on the basis of the lookup table generated in the compensation measurement step, determining a cogging torque corresponding to the current rotation position of the rotor, and applying a corresponding compensation signal to a control circuit of the permanent magnet synchronous motor. The control method and control apparatus in the present invention can improve the effect of cogging torque compensation.

The utility model provides a kind of low vibration, low noise stepping motor, including stator lamination and rotor lamination, the inside of stator lamination and rotor lamination is provided with the small tooth of improving electromagnetic coupling efficiency, the tooth slot ratio, tooth width, tooth shape and the included angle of adjacent small tooth of small tooth are all optimized improvement, the inside of stator lamination and rotor lamination is all increased and is set, it is related to the technical field of stepping motor.The utility model is designed by the tooth slot ratio, tooth width, tooth shape, the included angle of adjacent small tooth, the riveting point of stator lamination eight big poles on small tooth, the tooth slot ratio, tooth width, tooth shape, the riveting point of rotor lamination on small tooth, design optimization is carried out, reduce high harmonic, reduce tooth slot torque, make motor low-speed operation stability better, vibration and noise are smaller.

A motor cogging management system for an electrified vehicle includes a set of sensors configured to monitor a set of parameters for the electrified vehicle, wherein the set of parameters includes at least a speed of the electrified vehicle and a control system configured to determine whether cogging torque management is required for a first electric motor of the electrified vehicle based on the set of parameters, determine a maximum cogging management torque based on the set of parameters, determine a sign for the cogging torque management based on the set of parameters, and perform the cogging torque management by commanding additional torque at the first electric motor based on the determined maximum cogging management torque and the determined sign.

The invention provides a joint optimization method for geometric parameters of an outer rotor brushless direct current motor. According to the joint optimization method, average torque maximization, torque pulsation minimization and cogging torque minimization are taken as optimization targets; the method comprises the following steps: firstly, constructing a motor performance meta-model based on AMOP sampling and a moving least square-isotropic Kriging method, and establishing comprehensive sensitivity through Pearson correlation to distinguish primary sensitive and secondary sensitive variables; and then, a q-ROFS-TOPSIS method is introduced, so that a unified closeness degree evaluation index can be obtained. The optimization process adopts a two-layer staged optimization strategy: in the first stage, sub-sensitive variables are dominated, main sensitive is allowed to perform fine tuning, the relevance between main and sub parameters is emphasized, and optimization is performed through a particle swarm optimization algorithm; and in the second stage, the main sensitive variable is adjusted on the basis of the sub-sensitive optimization, and optimization is carried out through an evolutionary algorithm. According to the method, the optimal motor geometric parameter combination with high average torque, low torque ripple and low cogging torque can be obtained under the conditions of incomplete samples and multiple working conditions.

The application discloses a motor and a vehicle, the motor comprising: a rotor assembly, the rotor assembly comprising a rotor core and a plurality of permanent magnets, the rotor core being provided with a plurality of mounting slots, each mounting slot being provided with a permanent magnet, and the plurality of permanent magnets comprising permanent magnets made of at least two different materials; and a stator assembly, the stator assembly being arranged outside the rotor assembly, the stator assembly comprising a stator core, the stator core being formed by a plurality of stator laminations stacked along an axial direction, each stator lamination being provided with a plurality of stator slots arranged at intervals in a circumferential direction, each stator slot having a slot opening located on an inner wall of the stator core, and in the axial direction of the stator core, the plurality of stator slots of any two adjacent stator laminations are arranged one by one in a facing manner, and the slot openings of the stator slots arranged in the facing manner of any two adjacent stator laminations are arranged in a staggered manner. Thus, the cogging torque generated during rotation of the motor can be reduced, the stability of the motor can be improved, the demagnetization resistance of the permanent magnets can be improved, and the cost can be reduced.

The invention discloses a non-uniform air-gap motor design method and a non-uniform air-gap motor, and belongs to the field of motors. Through the steps of structural design, air gap design, multi-objective optimization, analysis of optimization values, simulation analysis and the like, the non-uniform air-gap motor design method can be used for designing a non-uniform air-gap motor. A non-uniform air gap is designed, and parameters such as a pole-arc coefficient, a stator notch width, a permanent magnet magnetization direction length and a maximum air gap length are obtained, so that the motor cogging torque and the motor torque fluctuation are small, and the motor performance is improved.

This invention belongs to the field of motor technology and discloses a high-linearity finite-angle torque motor, comprising a cylindrical rotor and a cylindrical stator, with the rotor housed within the stator. The stator includes N coils and N constant magnetic circuit channels, where N is an even number of at least 2. The rotor's magnet portion has N polarities. The N coils of the stator are evenly arranged circumferentially on the inner side of the stator, with adjacent coils separated by constant magnetic circuit channels. The ends of all coil frames and the ends of the constant magnetic circuit channels together form the rotor's rotational track. Adjacent stator coils have opposite polarities after being energized, and adjacent rotor magnets also have opposite polarities. This invention employs a special stator lamination structure, theoretically eliminating stator cogging torque within the motor's operating angle range, thus improving the linearity of the motor's output torque. Compared to traditional slotted finite-angle torque motors, the output torque fluctuation is reduced by more than 70%.

The invention discloses an integer slot permanent magnet motor rotor design method for reducing a segmented skewed pole angle, and the method comprises the following steps: determining the stator and rotor structures of a permanent magnet motor, the stator comprises a stator core and an armature winding, the rotor comprises a rotor core and a permanent magnet, and an air gap exists between the stator and the rotor; determining cogging torque harmonic components according to the slot-pole ratio of the permanent magnet motor; virtual slots are added on the outer surface of the rotor core, and the amplitude corresponding to the harmonic order of the cogging torque is improved; a rotor segmented skewed pole structure is adopted to suppress the cogging torque, the rotor is divided into a plurality of segments, the segmented skewed pole angle of the rotor is reduced, and the spatial phase difference of the topological structure of each segment of the rotor is set. According to the invention, the cogging torque can be effectively suppressed, and the defect that the average torque is reduced due to a relatively large skewed pole angle can be avoided.

The application relates to the motor technical field and is a method for changing the slot torque of a permanent magnet synchronous motor. First, a slot torque expression based on an energy method is established, and a distribution function relationship expression before and after the change of the air gap length is derived; second, a motor model is established, the tooth crest height is changed, the air gap length is increased, and the slot torque is weakened; finally, the air gap length of the motor is further optimized through arc cutting of the tooth tip, and the slot torque is further weakened. Since the motor also affects other performances during optimization, the output torque and loss before and after optimization are compared and analyzed, the output torque is reduced, the loss is increased by less than 0.5%, and the efficiency and power of the motor are ensured.

The application discloses a rotor, which comprises a rotor body, at least one magnetic steel slot and at least one q-axis magnetic isolation hole are arranged on the rotor body, the q-axis magnetic isolation hole is located at the left and / or right end of the magnetic steel slot, a d-axis magnetic isolation hole is further arranged on the rotor body, the d-axis magnetic isolation hole is communicated with the q-axis magnetic isolation hole, and the left and right sides of the d-axis magnetic isolation hole are provided with a first magnetic isolation structure and a second magnetic isolation structure. The rotor can effectively change the magnetic circuit track, reduce the tooth slot torque, reduce the torque ripple, reduce the speed fluctuation, and then can improve the positioning accuracy of motor control, reduce the starting difficulty, improve the low-speed control effect, and effectively reduce the motor vibration and noise caused by the torque ripple.

This invention relates to a segmented skewed-pole surface-mount permanent magnet brushless DC motor rotor and its application, belonging to the field of permanent magnet motor technology. The rotor includes a permanent magnet, an iron core, and a main shaft. The main shaft has at least two axially parallel keyways, with the center lines of adjacent keyways deflected by a preset angle θ along the circumferential direction. A flat key is provided within each keyway. A second groove is provided within the annular iron core, and the iron core is fitted onto the main shaft via the second groove and the flat key. A first groove is provided on the outer surface of the iron core. A rib is provided within the annular permanent magnet, and the annular permanent magnet is fitted onto the iron core via the rib and the first groove. A positioning snap ring is provided on the main shaft outside the annular permanent magnet. This invention can easily achieve segmented skewed poles, reduce cogging torque, facilitate assembly, and provide precise positioning. Furthermore, by introducing delayed commutation, it optimizes the commutation method, compensates for the performance degradation problem of segmented skewed-pole motors, and improves the utilization rate of the permanent magnet.

The application discloses a motor and a control valve, and relates to the technical field of motors.The motor comprises a pole plate assembly, the pole plate assembly is formed in a ring shape and internally defines a winding space, the inner side of the ring shape of the pole plate assembly is formed as a stator hole; a winding is arranged in the winding space; and a rotor is rotatably arranged in the stator hole, and the magnetic resistance remains unchanged during rotation of the rotor.According to the motor, the pole plate assembly is formed in a ring shape and internally defines a winding space, the inner side of the ring shape of the pole plate assembly is formed as a stator hole, the winding is arranged in the winding space, and the rotor is rotatably arranged in the stator hole, and the magnetic resistance remains unchanged during rotation of the rotor, so that the magnetic resistance does not change with the rotation angle of the rotor, the cogging torque of the motor can be weakened, the problem that the rotor rotates after the winding is powered off can be reduced, the control precision of the motor is higher, and the required precision requirement can be met.

The invention relates to a brushless electric machine (1) having at least one stator (2), at least one rotor (3), at least one shaft (4) and at least one winding (8), the rotor (3) being fixed to the shaft (4), the rotor (3) having at least one permanent magnet (5) having a plurality of magnetic rotor poles (5a), the stator (2) having a plurality of stator teeth (6), wherein each stator tooth (6) is at least partially wound by at least one stator coil (7), and wherein the stator coils (7) form a winding (8) having at least three phases (P1, P2, P3). An electric machine, in particular for driving a component supply station of an automatic assembly machine, which generates a sufficiently high cogging torque amplitude and at the same time provides a high torque with a high number of cogging fluctuations, is achieved in that at least one stator tooth (6, 6a) of at least one first phase (P1) of a winding (8) is designed as an elongated stator tooth (6, 6a), the elongated stator teeth (6, 6a) have a longitudinal extension in the radial direction which is greater than the longitudinal extension of at least one stator tooth (6, 6b) of the remaining stator teeth (6, 6b) of the first phase (P1) and / or which is greater than the longitudinal extension of at least one stator tooth (6) of at least one of the remaining phases (P2, P3).

The invention provides an in-pole asymmetric magnetic pole permanent magnet driving motor for reducing cogging torque for an electric automobile, which belongs to the technical field of automobile motor electric appliances, and is characterized in that a driving motor rotor is an in-pole asymmetric magnetic pole permanent magnet rotor, and the interior of each magnetic pole is asymmetric about permanent magnet steel on the left side and the right side of a magnetic pole center line; the adjacent N magnetic poles and S magnetic poles are also not symmetrical, periodic distribution of magnetic resistance is broken, the cogging torque is low, the torque pulsation is small, the magnetic field of each magnetic pole is provided by multiple layers and multiple pieces of permanent magnet steel together, the magnetic gathering effect is remarkable, the magnetic field intensity is large, the power density is high, the air gap flux density is in sine distribution, the waveform distortion rate is small, and the driving motor runs stably.