31results about How to "Optimized magnetic circuit" patented technology

The invention provides a rotor structure, a permanent magnetism auxiliary synchronization magnetic resistance motor and an electric vehicle; the rotor structure comprises a rotor body having a magnetic steel slot set; the magnetic steel slot set comprises inner magnetic steel slots; the rotor body is also provided with a first fold slot and a second fold slot; the first fold slot is connected witha first end of the inner magnetic steel slot; the geometric center line of the first fold slot in the length direction and that of the first end of the inner magnetic steel slot in the length direction form a first inclined angle; the second fold slot is connected with a second end of the inner magnetic steel slot; the geometric center line of the second fold slot in the length direction and thatof the second end of the inner magnetic steel slot in the length direction form a second inclined angle; the first and second inclined angles are different. The first and second inclined angles are set to be different, thus optimizing the rotor structure magnetic path, increasing the rotor structure torque, reducing rotation pulse torque, improving the motor anti-demagnetism capability, and improving the motor efficiency.

The invention discloses a permanent magnet motor and an air conditioner, wherein the permanent magnet motor comprises a rotor and a stator arranged in a way of surrounding the rotor; the ratio D1 / D2 of the outer diameter D1 of the rotor to the outer diameter D2 of the stator is 0.56 to 0.63. The technical scheme has the advantage that the efficiency of the permanent magnet motor can be improved.

A double stator and double wire coil electromagnetic liquid-cooled retarder is disclosed and belongs to the field of non-contact automobile braking. A most important characteristic of an eddy current retarder is non-contact braking which is high in responding performance and good in low speed braking effects, automobile braking performance is improved, fast brake pad and tire consumption caused due to friction in traditional braking processes can be prevented, braking noise can be eliminated, and environment pollution can be prevented; driving safety, comfort and economical performance of vehicles can be greatly improved; driver fatigue and emergent braking can be reduced; working efficiency can be improved; driving smoothness can be realized. The double stator and double wire coil electromagnetic liquid-cooled retarder works as an automobile auxiliary braking device; a disk rotor, a double stator and double wire coil structure, a design of arranged the wire coils at a center, and a structure of reasonably integrating stators and water channels are adopted in an innovative manner; axial dimensions of the electromagnetic retarder is effectively reduced, a heat radiating system is optimized, electromagnetic retarder heat fading phenomena are inhibited, overall braking torque is greatly improved, and braking effects are increased.

The invention provides a rotor structure, a permanent magnet auxiliary synchronous reluctance motor and an electric vehicle. The rotor structure includes a rotor body. A permanent magnet slot group isdisposed on the rotor body. The permanent magnet slot group includes a plurality of permanent magnet slots. The multilayer permanent magnet slot includes a first permanent magnet slot. The first permanent magnet slot includes a first permanent magnet slot segment and a first hinge slot. The first end of the first chamfer is in communication with the second end of the first permanent magnet slot segment. A second end of the first chamfer extends toward an outer edge of the rotor body. A distance from a midpoint of the second end of the first chamfer adjacent the outer edge of the rotor body toa point at which the geometric centerline of the first permanent magnet slot intersects the outer edge of the rotor body is A. The width of the end of the second end of the first permanent magnet slot segment is M, where 0.6 M <=A. This arrangement optimizes the magnetic circuit of the rotor structure, so that the overall anti-demagnetization capability of the rotor structure is effectively improved, and the motor efficiency of the rotor structure with the structure is improved.

The present invention provides a rotor structure, a permanent magnet auxiliary synchronous reluctance motor and an electric vehicle. The rotor structure comprises a rotor body, the rotor body is provided with a permanent magnet slot group, the permanent magnet slot group comprises an outer layer of permanent magnet slot and an inner layer of permanent magnet slot, a magnetic conductive channel isformed between the adjacent outer layer of permanent magnet slot and inner layer of permanent magnet slot, at least one end of the magnetic conductive channel is provided with a deflection section, and a distance from the deflection section to a quadrature axis of the rotor body is gradually reduced outwards in a radial direction to allow the tail end of the magnetic conductive channel to be arranged close to the quadrature axis. The at least one end of the magnetic conductive channel is provided with the deflection section and the distance from the deflection section to the quadrature axis ofthe rotor body is gradually reduced outwards in a radial direction to optimize the magnetic circuit of the rotor structure and improve the reluctance torque of the motor, the shape of the permanent magnet slot is further improved to allow the whole demagnetization-resistant capacity of the rotor permanent magnet to be improved, reduce the motor torque pulsation, reduce the vibration and noise ofthe motor and improve the demagnetization-resistant capacity of the motor.

The invention discloses a V-shaped slot rotor of a self-starting permanent magnet synchronous motor, comprising an iron core, permanent magnets, squirrel-cage conducting bars and a shaft, wherein the iron core is provided with slots which are arranged as a V shape, every two permanent magnets arranged in the V-shaped slot form a magnetic pole, bottoms of all the V-shaped slots are separated to form magnetic bridges of the two permanent magnets in the V-shaped slots, and an axial air slot is arranged between every two squirrel-cage conducting bars corresponding to the tops of the corresponding adjacent V-shaped slots; or only are the bottoms of all the V-shaped slots separated to form magnetic bridges of the two permanent magnets in the V-shaped slots; or only is the axial air slot arranged between every two squirrel-cage conducting bars corresponding to the tops of the corresponding adjacent V-shaped slots. Compared with the V-shaped slot rotor used in China and abroad, the V-shaped slot rotor disclosed by the invention avoids the phenomenon of local demagnetizing of the permanent magnets in the starting process, simultaneously reduces the eddy-current loss inside the rotor in the steady-state running process and has a certain effect on improving the reliability and the steady-state performance of the self-starting permanent magnet synchronous motor.

The invention relates to an integrated yoke element of a small type circuit breaker, which is characterized in that the yoke and an iron core are designed as an integrated element. The iron core is embedded in the coil of the small type circuit breaker; the shape of the iron core is designed as a U shape or an L shape or a closed square-shaped contour; the iron core is provided with a magnetic pole plane, the middle of which is provided with an opening hole which is used for guiding an armature; and a convex shoulder which is used for supporting and fixing a static contact stent is arranged on the yoke. As the yoke and the iron core are designed as the integrated element which is formed by ferromagnetic metal material with good magnetic conductivity by punching, the structure of the yoke element is simplified and the type of the part is decreased, which not only saves the processing cost of raw materials, but also brings convenience for the warehouse management and reduces the equipment investment; simultaneously, the turning pieces with high price is reduced, the production cycle is shortened, and the magnetic circuit of a magnetic release is improved, thereby leading the performance of the whole circuit breaker to be more stable and reliable.

The invention provides a high-power vehicle AC generator, able to reduce the noise called wind noise and electromagnetic noise, improving the rotor magnetic circuit. Its character: it has the chamferangle part composed of the surface which links the following three points: point B, developed on the circumferential end surfaces of the base shoulder of the pole boots(18a) and (19a) and developed on the subulate starting line by the peripheral surfaces of the base shoulder, point C on the warping tilt part of the pole boots (8a) and (9a), and point an on the circumferential end surfaces of the pole boots (8a) and (9a) L1 / 4-7í‡L1 / 8 distant from the end surface of the stator iron core when the distance between the base side end surface of the pole boots (8a) and (9a) and the end surface of the stator iron core is set as L1.

A vector magnetic fluid motor based on phase angle controlling comprises a stator, a rotor and a coil. The stator is arranged opposite to the rotor; the stator is fixed; and the rotor can move relatively to the stator. At least one stator magnetizer is arranged in the stator; and at least one rotor magnetizer is arranged in the rotor. An air gap is arranged between the stator magnetizer and the rotor magnetizer. The coil is wound on the stator magnetizer and the rotor magnetizer. A position sensor and a controller are arranged, and the position sensor is connected with the controller; and the coil is connected with a power source through the controller. Totally different working principles and working manners are adopted on the vector magnetic fluid motor; two working manners of magnetic field rotating and phase shifting of traditional motors are completely abandoned; inductive reactance is basically eliminated; impedance is drastically reduced; and remarkable energy-saving effect is achieved. The vector magnetic fluid motor has fire-new structure and working manners.

The invention discloses a piston type testing device for the squeezing flow dynamic characteristics of magnetorheological fluid. The testing device comprises an upper flange plate 1, an upper end cover 2, an upper connecting bolt 3, an upper piston rod 4, a piston 5, a lower piston rod 6, a locating sleeve 7, a magnet exciting coil 8, a lower end cover 9, a lower connecting bolt 10, a lower flange plate 11 and a plurality of sealing rings. The fluid to be tested is contained in an airtight working cavity A formed by the upper end cover 2, the lower end cover 9 and the locating sleeve 7. The piston 5 is clamped by the shaft shoulder of the upper piston rod 4 and the shaft shoulder of the lower piston rod 6 and arranged in the working cavity A, and the upper piston rod 4 and the lower piston rod 6 move vertically to drive the piston 5 to squeeze the fluid to be tested in the working cavity A. The testing device is used for testing the squeezing flow dynamic characteristics of the magnetorheological fluid in a quasi-static state, a dynamic state and particularly a high-frequency vibrating state.

The invention discloses a motor external stator with adjustable inner diameter, which is characterized in that the stator core is formed by superposing a plurality of annular stator core stampings with integral structures; tooth sheets of the stator core stampings are correspondingly superposed to form unit tooth blocks of the stator core; a connected body of the stator core stampings are correspondingly superposed to form a connecting part among the unit tooth blocks; a major yoke part of the stator core is formed on the tooth root part of the unit tooth blocks; a secondary yoke part of the stator core is formed by bending the connecting part into ear shape; and the peripheral surface of the stator core is in close fit with a strap to form the whole structure of the motor external stator. According to the motor external stator with adjustable inner diameter, the winding difficulty is reduced; the diameter of the motor stator can be changed by controlling the contraction degree of the stator core by changing the inner diameter of the strap and the size of cushion block so as to be suitable for the rotors with different diameters, and the production cost of the motor is greatly reduced.

This invention relates to transformer iron core slice iterated method, which combines the one-slice iterated method and two and three slice iterated method organically. The invention is characterized by the following: adopting one-slice iterated method at the one sixth of the thickness of the iron column; adopting two-slice iterated method at the one sixth of the thickness of the iron column; adopting three-slice iterated method at the one third of the thickness of the iron column

The invention relates to a built-in permanent magnet synchronous motor for a kart. The built-in permanent magnet synchronous motor for a kart includes a stator core, a rotor core and a rotor spindle,wherein the stator core is provided with a plurality of stator teeth; a stator groove is formed between every adjacent stator teeth; the tooth end of each stator teeth is provided with an arc elementary slot; a plurality of V type magnetic poles facing the outer peripheral face of the rotor are arranged on the rotor core in the circumferential direction; each pair of V type magnetic poles are symmetrically arranged by taking the symmetrical center line between the pair of magnetic poles as the axle; an intra-polar magnetism isolating bridge and an inter-polar magnetism isolating bridge of eachV type magnetic pole are the same in the width; the external diameter of the rotor core includes eccentric arcs corresponding to the V type magnetic poles; an eccentric distance is arranged between the center of circle of each eccentric arc and the center of circle of the rotor spindle, and the eccentric distance between the center of circle of each eccentric arc and the center of circle of the rotor spindle is the same; the rotor core is provided with a plurality of ventilating holes corresponding to each pair of V type magnetic poles; the rotor core is provided with a plurality of rivet holes which are arranged between the V type magnetic poles and the rotor spindle and are distributed along a ring shape.

The invention relates to a stator consisting of a plurality of metal sheets (1a, 1b, 1c,..., 1n) forming a generally cylindrical packet of metal sheets (1), said stator having a plurality of radial notches (2), each being delimited by two adjacent teeth (3) extending radially and being connected to one another by the proximal end (3A) thereof, the distal ends (3B) thereof defining a cylindrical axial recess capable of receiving a rotor and being provided with tooth roots (4), an insulator (5) for insulating the bottom of the notch which is provided inside the notches and covers the inner wall of said notches along the useful boundary for receiving conductive wires (F), said stator further comprising a plurality of flat shims (6) for closing the notches, characterised in that each notch-closing shim is arranged inside a notch, at a distance greater than zero from the lower end of the notch-bottom insulator.

The invention provides an iron core structure, a rotor assembly, a motor and a compressor. The iron core structure comprises an iron core body; the plurality of groups of magnetic steel grooves are uniformly distributed along the circumferential direction of the iron core body and are used for accommodating the permanent magnets; first magnetism isolating holes are formed between the magnetic steel grooves and the outer circumference of the iron core body, the ends, away from the D axis, of the magnetic steel grooves are first end parts, and the first magnetism isolating holes are adjacent tothe first end parts; the first magnetic isolation holes are L-shaped, and one edge of the L shape is arranged along the radial direction of the iron core body. According to the iron core structure, the L-shaped first magnetic isolation holes are formed in the two ends, away from the D axis, of one magnetic pole respectively, so that a motor magnetic circuit is optimized and the electromagnetic force amplitude of the rotor iron core is reduced under the condition that the output torque of the motor is not influenced. The harmonic content in the air gap flux density can be reduced, the iron lossof the motor is further reduced, and the vibration noise of the motor is improved, so that the overall noise of the compressor is reduced.

The invention provides an energy-saving type transformer and a manufacturing method thereof. The energy-saving type transformer comprises an iron core. The iron core is mainly composed of an upper iron yoke, a lower iron yoke and core columns. The energy-saving type transformer is characterized in that the three core columns are arranged and located between the upper iron yoke and the lower iron yoke; the three core columns are arranged in a shape like a Chinese character 'pin'; the intervals between the three core columns are equal. Seams are filled with high-permeability materials, a magnetic circuit is improved, and no-load losses and no-load currents of the iron core are reduced. The transformer formed by directly sewing the rolled core is treated through a seam special process, compared with a traditional linear laminated core transformer, materials can be saved, production efficiency can be improved, and the production cost can be reduced; due to the fact that the magnetic circuit can be improved through the iron core columns, noise is also relieved and obviously reduced while the no-load losses and the no-load currents are small. A transformer coil can be independently wound and then installed on the iron core, and production efficiency is improved. The economical energy-saving type transformer core is provided for the transformer industry.

The invention belongs to the technical field of transformers, and particularly relates to a polygonal solid volume iron core load-regulating capacitance-regulating transforme, which comprises a polygonal oil tank, wherein the polygonal oil tank comprises a rectangular shell and a trapezoidal shell, and the rectangular shell and the trapezoidal shell are integrally formed; the three-dimensional coiled iron core is a triangular three-dimensional coiled iron core, and the triangular three-dimensional coiled iron core is arranged at the joint of the rectangular shell of the polygonal oil tank andthe trapezoidal shell; the three-phase three-component coil is wound on the three-dimensional coiled iron core; the load-regulating capacitance-regulating switch is arranged in the rectangular shell of the oil tank at one side of the three-dimensional coiled iron core; And the accessory and the three-phase three-winding coil are connected with a load-carrying capacity-regulating switch through anaccessory. The transformer can change the rated operation capacity mode and the voltage tap conversion according to the actual load and voltage condition, reduce the transformer's own no-load loss, achieve the voltage adjustment, improve the economic operation level of the distribution board area, and improve the supply voltage quality.

The invention provides a rotor structure, a permanent magnet assisted synchronous reluctance motor and an electric vehicle. The rotor structure includes the rotor body. The rotor body is provided with a magnetic steel groove group. The magnetic steel groove group includes the inner magnetic steel groove. The rotor body is also provided with a first folding groove and a second folding groove. The first folding groove and the inner layer The first end of the magnetic steel groove is connected, the geometric centerline of the length direction of the first folding groove and the geometric centerline of the length direction of the first end of the inner magnetic steel groove have a first angle, and the second folding groove and the inner The second end of the magnetic steel groove of the layer is connected, and the geometric centerline of the length direction of the second folding groove has a second angle with the geometric centerline of the second end of the inner layer magnetic steel groove, wherein the first angle and The second included angles are not equal. Setting the first included angle to be unequal to the second included angle can optimize the magnetic circuit of the rotor structure, thereby increasing the torque of the rotor structure, reducing the effect of the rotating torque, improving the anti-magnetic demagnetization ability of the motor, and improving the the efficiency of the motor.

The invention discloses a microstrip circulator, which can be used in isolators and microwave communications, especially in T / R components. The microstrip circulator is provided with a second substrate on the upper surface of the substrate by adding a substrate. A grounding metal layer, the lower surface of which is provided with a soldering area electrically connected to the first grounding metal layer and used for surface mounting, and a plurality of avoidance parts are provided on the substrate; and the central conductor of the microstrip circulator The plurality of connection parts correspond to the plurality of connection ends provided on the lower surface of the gyromagnetic layer and are electrically connected; the gyromagnetic layer is arranged on the substrate, and the first ground metal layer and the second ground metal layer are electrically connected. Sexual connection, at the same time, the welding end corresponds to the avoidance part one by one and passes through the corresponding avoidance part, as a soldering part of the surface mount. Therefore, the present invention can not only achieve surface mounting with an external circuit through the substrate, but also reduce the impact of external force on the gyromagnet through the substrate.

The invention provides a rotor structure and a permanent magnet auxiliary synchronous reluctance motor. The rotor structure comprises a rotor body, wherein the rotor body is provided with a permanentmagnet groove group, the permanent magnet groove group comprises a plurality of layers of permanent magnet grooves, a plurality of layers of permanent magnet grooves comprise a first permanent magnetgroove and a second permanent magnet groove section, the rotor structure further comprises a first permanent magnet and a second permanent magnet, a midpoint of a connecting line from the midpoint ofa side wall, close to an edge of the rotor body, of the first permanent magnet groove to an edge of the rotor body is P, the center of the rotor body serves as the circle center, a distance from the circle center to the point P serves as the radius, a circular arc is made in the circumferential direction of the rotor body, the sum of thicknesses of the first permanent magnet and the second permanent magnet at the intersection of the circular arc is M3, the perimeter of the circular arc is C1, M3 / C1 = T2, and T2 is larger than or equal to 45% and smaller than or equal to 70%. The rotor structure is advantaged in that the magnetic circuit of the rotor structure is optimized, so demagnetization resistance of the whole rotor structure is effectively improved, and motor efficiency of the rotorstructure with the structure is improved.

The invention discloses a double-magnetic-field modulation type magnetic gear composite motor which comprises a transmission shaft, a fixed end cover, a permanent magnet rotor, a motor stator, an auxiliary magnetic modulation ring and a fixed shaft which are coaxially arranged. The fixed shaft is connected with the fixed end cover, the fixed end cover and a pole shoe of the permanent magnet rotor are provided with intercommunicated screw holes, and the fixed end cover and the pole shoe are fixed through bolts and nuts. The motor stator comprises a stator punching sheet and a magnetism adjusting block, the motor stator is formed by stacking laminated silicon steel sheets, and the stator punching sheet and the magnetism adjusting block are integrated. A layer of main air gap is arranged between the permanent magnet rotor and the motor stator, and the auxiliary magnetism adjusting ring is fixed in the permanent magnet rotor through a fixing shaft. A layer of auxiliary air gap is arranged between the auxiliary magnetism adjusting ring and the permanent magnet rotor, and a permanent magnet in the permanent magnet rotor is of an embedded spoke type structure. According to the present invention, the structure of an embedded spoke type permanent magnet magnetic circuit can be improved, and the torque performance of the embedded spoke type permanent magnet magnetic circuit on an application object is enhanced.

The invention discloses a piston type testing device for the squeezing flow dynamic characteristics of magnetorheological fluid. The testing device comprises an upper flange plate 1, an upper end cover 2, an upper connecting bolt 3, an upper piston rod 4, a piston 5, a lower piston rod 6, a locating sleeve 7, a magnet exciting coil 8, a lower end cover 9, a lower connecting bolt 10, a lower flange plate 11 and a plurality of sealing rings. The fluid to be tested is contained in an airtight working cavity A formed by the upper end cover 2, the lower end cover 9 and the locating sleeve 7. The piston 5 is clamped by the shaft shoulder of the upper piston rod 4 and the shaft shoulder of the lower piston rod 6 and arranged in the working cavity A, and the upper piston rod 4 and the lower piston rod 6 move vertically to drive the piston 5 to squeeze the fluid to be tested in the working cavity A. The testing device is used for testing the squeezing flow dynamic characteristics of the magnetorheological fluid in a quasi-static state, a dynamic state and particularly a high-frequency vibrating state.

The invention discloses a motor inner stator with adjustable outer diameter, which is characterized in that a stator iron core is formed by overlapping a plurality of stator iron core stamping pieces in annular integral structures, tooth pieces of the stator iron core stamping pieces are correspondingly overlapped to form unit tooth blocks of the stator iron core, connecting bodies of the stator iron core stamping pieces are correspondingly overlapped to form connecting parts among the unit tooth blocks, the tooth root part of each unit tooth block forms a main yoke part of the stator iron core, each connecting part is bent towards the circle center of the stator iron core and is in an ear shape so as to form a secondary yoke part, the edge of a stator bracket corresponds to the tooth root of each unit tooth block and forms a through slot with each connecting part, a plurality of limiting supporting bosses are arranged at the through slots, and the through slots and the stator iron core are buckled into a whole by using the limiting supporting bosses. According to the inner stator, the coiling difficulty is reduced, the diameter of the motor stator is changed by controlling the degree of shrinking and combining degrees of the stator iron core under a condition that the motor stator iron core stamping piece mold is not changed, and only the size of the brocket is changed, thereby being adapted to stators with different diameters and greatly reducing the production cost of a motor.

A loudspeaker magnetic circuit system, comprising a magnetic steel, a magnetically conductive upper plate, a magnetically conductive lower plate, and a magnetically conductive column; The magnetic column is set in the center hole of the annular magnet; The average magnetic declination of the ring is the average magnetic declination of the second magnetic ring. The average magnetic declination of the third magnetic ring is the average magnetic declination of the fourth magnetic ring. The angle θ is the angle between the magnetic upper plate and the magnetic steel. It is defined as: a virtual center circle is created at the center between the inner diameter surface and the outer diameter surface of the annular magnetic steel, and a distance connection line is drawn between the circle where the bottom end of the inner diameter surface of the magnetic permeable upper plate is located and the center circle, and the distance connection line and The angle between the end faces of the ring magnetic steel is θ. The present invention designs the included angle between the magnetic upper plate and the magnetic steel according to the different magnetic declination angles of the magnetic steel, so that the magnetic steel and the magnetic upper plate are better matched, and the magnetic field intensity is increased.

The invention relates to the field of motors, and discloses an outer rotor synchronous motor rotor structure with magnets arranged in a V shape and a motor, and the outer rotor synchronous motor rotor structure comprises an outer rotor iron core, magnetic conductive iron cores, permanent magnets, supporting strips and fastening strips; the inner side of the outer rotor is provided with an annular groove which is distributed along the circumferential direction of the inner ring of the outer rotor iron core. The outer rotor iron core, the magnetic conductive iron core, the permanent magnets, the supporting strips and the fastening strips are installed in the groove. The fastening strip, the permanent magnet a, the supporting strip and the permanent magnet b are sequentially connected, the permanent magnet a and the permanent magnet b form an installation opening with an opening facing the inner ring of the outer rotor iron core, the magnetic conductive iron core is installed in the installation opening in a filling mode, the magnetic conductive iron core, the fastening strip, the permanent magnet a, the supporting strip and the permanent magnet b form magnetic conductive sets, and the adjacent magnetic conductive sets are sequentially connected along the track of the groove. The grooves are filled with the magnetic conductive groups which are connected in sequence, and an annular surface is formed on one side close to the stator. The rotor structure has the advantages of compact structure, large motor torque, few used permanent magnets and the like.

The invention discloses a microstrip circulator, which can be applied to isolators and microwave communication and is particularly used in a large scale in T / R assemblies. A gyromagnetic layer of themicrostrip circulator comprises a first substrate and a gyromagnetic body embedded in the first substrate, wherein the dielectric constant of the first substrate is higher than that of the gyromagnetic body. Due to the fact that the gyromagnetic layer adopts the composite structure, the dielectric constant can be improved on the whole. Under the same performance requirements as the products in theprior art, the microstrip circulator can reduce the area of a central conductor, then the area of the whole microstrip circulator is reduced, and miniaturization in the real sense is achieved.

The invention discloses a novel stator tooth pole structure which comprises a stator tooth pole body. The stator tooth pole body comprises an annular yoke part, the yoke part extends outwards to forma tooth part, the stator tooth pole body comprises a plurality of tooth parts which are uniformly arranged along the circumferential direction, and the tail end of each tooth part is provided with anarc-shaped tooth pole. An insulating layer is arranged on an inner side portion defined by the yoke portion, the tooth portion and the tooth pole, a winding is wound on the outer side of the insulating layer of the tooth portion, the included angle between one end of the tooth pole of the stator tooth pole body and a central axis is a smaller angle A, the included angle between the other end of the tooth pole of the stator tooth pole body and the central axis is a larger angle B, and the ratio of the smaller angle A to the larger angle B, namely A / B is between 0.85-0.99. According to the stator tooth pole structure, the tooth pole shape is subjected to magnetic circuit optimization and structure optimization, so that the torque chain wave of a fan motor can be reduced, the vibration and electromagnetic noise of a fan can be reduced, and the performance of the fan can be improved while the strength is ensured.