CN110829636A - Motor stator and motor - Google Patents

Abstract

The invention provides a motor stator and a motor, wherein the motor stator comprises: a plurality of stator modules arranged along a circumferential direction, the stator modules comprising: an arcuate stator yoke; the stator teeth can be assembled on the arc-shaped stator yoke in a matching mode, the stator teeth sequentially comprise claw parts, waist parts and root parts which are connected with each other from inside to outside along the radial direction, and the claw parts and the root parts extend outwards along the axial direction relative to the waist parts; and the stator winding is correspondingly wound on the tooth waist part. According to the technical scheme, on one hand, the axial thickness of the motor stator can be reduced, and further the axial thickness of the motor adopting the motor stator is reduced, so that the motor can be applied to electric equipment such as a washing machine with limitation on the axial size of the motor, on the other hand, the motor stator is arranged in a modular splicing structure, and the phase difference of induced voltage on the stator winding can be adjusted by adjusting the physical distance between adjacent stator modules, so that the motor with required phase number can be obtained.

Description

Motor stator and motor

Technical Field

The invention relates to the field of motors, in particular to a motor stator and a motor.

Background

For a motor applied to a washing machine adopting a direct drive technology, it is required that the axial size of the motor is as small as possible so as not to increase the axial size of the washing machine too much while increasing the washing capacity.

In the related art, the motors are classified into an outer rotor motor and an inner rotor motor according to the rotor form, and for the outer rotor radial flux motor using permanent magnet steel, the process is mature, the torque density is large, and then the following defects still exist:

the axial thickness of the outer rotor, the unavoidable axial physical air gap between the outer rotor and the inner stator, and the winding end which cannot be avoided by the radial flux motor all result in the motor being too thick, so that the axial installation size of the motor is increased, which becomes a disadvantage in some applications pursuing thin design, such as a direct drive motor of a washing machine.

Disclosure of Invention

In order to solve at least one of the above technical problems, an object of the present invention is to provide a stator of an electric motor.

It is another object of the present invention to provide an electric machine.

In order to achieve the above object, a technical solution of a first aspect of the present invention provides a motor stator, including: a plurality of stator modules arranged along a circumferential direction, the stator modules comprising: an arcuate stator yoke; the stator teeth can be assembled on the arc-shaped stator yoke in a matching mode, the stator teeth sequentially comprise claw parts, waist parts and root parts which are connected with each other from inside to outside along the radial direction, and the claw parts and the root parts extend outwards along the axial direction relative to the waist parts; stator winding corresponds around establishing on the tooth waist, wherein, splices along circumference end to end through two adjacent arc stator yoke portion, and a plurality of stator module are arranged along circumference.

In the technical scheme, the motor stator structure is arranged into a structure formed by a plurality of stator modules arranged along the circumferential direction, and each stator module is formed by assembling an arc-shaped stator yoke part and a stator tooth, on one hand, the size of the arc-shaped stator yoke part and the assembling mode between the stator tooth and the arc-shaped stator yoke part are optimized, compared with the scheme of adopting an outer rotor motor in the prior art, the axial thickness of the motor stator can be favorably reduced, and further the axial thickness of the motor adopting the motor stator is reduced, so that the motor stator structure can be applied to the application occasions of low speed and large torque, such as a driving motor in a washing machine, which have limitation on the axial size of the motor but have no strict limitation on the radial size of the motor, on the other hand, the adjustment of the phase difference of induced voltage on a stator winding can be realized by adjusting the physical distance between the adjacent stator modules through setting the motor stator, and then can obtain the motor of required number of phases, on the other hand, inject the stator slot between two adjacent stator teeth, in winding and establishing the in-process, can wind stator winding and establish on stator tooth after, assemble stator tooth and arc stator yoke portion again, also can be after assembling stator tooth and arc stator yoke portion, carry out stator winding and establish, when promoting around establishing the flexibility, still be favorable to promoting the slot filling rate that stator winding was established in the stator slot, thereby be favorable to promoting the torque density of motor.

The stator teeth are assembled on the arc-shaped stator yoke portion, various realization forms can be provided, for example, the stator teeth and the arc-shaped stator yoke portion can be assembled in a butt joint mode along the radial direction, specifically, inserting structures matched with each other can be respectively arranged on the tooth root portion and the arc-shaped stator yoke portion, and the stator teeth and the arc-shaped stator yoke portion are assembled in a butt joint mode along the radial direction.

The assembly can also be realized by mutually sleeving, specifically, a fixed groove can be formed in the tooth root part, the assembly can be realized by sleeving the arc-shaped stator yoke part in the fixed groove, a circumferential fixed groove can also be formed in the arc-shaped stator yoke part, and the tooth root part is sleeved in the circumferential fixed groove.

In addition, slot paper can be adopted among the stator winding, the stator yoke and the stator teeth to realize insulation, and an insulation frame can also be adopted to realize insulation.

The motor stator can be prepared by adopting a plastic coating process.

In addition, the motor stator in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, preferably, when the plurality of stator modules are connected end to end in the circumferential direction to construct the motor stator forming an integrated structure, each of the arc-shaped stator yoke portions has at least one stator tooth, and when the plurality of stator modules are fixedly arranged independently of each other, each of the arc-shaped stator yoke portions has at least two stator teeth.

In this technical scheme, a plurality of stator modules are arranged along circumference, can interconnect between two adjacent stator modules, also can be mutually independent, and when interconnect, at least one stator tooth has on every arc stator yoke portion, when mutually independent, has two at least stator teeth on every arc stator yoke portion.

In the above technical solution, preferably, the root of the stator tooth is provided with a fixing groove, wherein the arc-shaped stator yoke is sleeved in the fixing groove, so that the stator tooth and the arc-shaped stator yoke are assembled in a matching manner.

In this technical scheme, set up the fixed slot through the root at the stator tooth, cooperate through fixed slot and stator yoke portion to realize that the stator tooth assembles on arc stator yoke portion, when satisfying the assembly intensity between stator tooth and the arc stator yoke portion, can be as little as possible with the axial thickness or the high setting of stator yoke portion, in order to satisfy driving motor's preparation demand among electrical equipment such as washing machine.

In any one of the above technical solutions, preferably, the stator teeth are formed by stacking a plurality of stator tooth punching sheets along a circumferential direction, and each stator tooth punching sheet includes: tooth claw portion, tooth waist portion and tooth root portion, tooth claw portion, tooth waist portion and tooth root portion are along radially connecting gradually from interior to exterior, have seted up the fixed slot along the axial on tooth root portion, and two sides that the tooth root portion was run through along circumference to the fixed slot, and wherein, a plurality of stator teeth can form stator module with the structure through the fixed slot and the cooperation of arc stator yoke portion joint, and tooth claw portion can enclose along circumference and establish the fitting surface that forms and motor rotor complex.

In this technical scheme, every stator tooth is folded by a plurality of stator tooth lamination and is pressed and form, every stator tooth can include the root of tooth, tooth waist portion and tooth claw portion, the root of tooth is used for being connected with stator yoke portion, tooth waist portion can carry out the winding around establishing, and tooth claw portion can be arranged along circumference and form the circumference fitting surface with electric motor rotor complex, form stator tooth through the form with the stator tooth lamination, and then combine stator yoke portion structure to form the stator core structure, compare with the motor that adopts the stator tooth of part or whole adoption metallurgical material preparation, it is lower to realize the cost.

In any one of the above technical solutions, preferably, the outer side wall and the inner side wall of the arc-shaped stator yoke portion are respectively formed by a multi-segment straight surface along a circumferential splicing structure.

In this technical scheme, through with arc stator yoke portion on with fixed slot complex part be straight face structure to realize the laminating adaptation between fixed slot and the stator yoke portion, and then be favorable to promoting the motor stator's after the equipment intensity.

In any one of the above technical solutions, preferably, the outer side wall and the inner side wall of the arc-shaped stator yoke are arc surfaces, and the region matched with the stator teeth on the arc surfaces forms a slot structure through a concave arrangement.

In this technical scheme, through set up the draw-in groove structure on arc stator yoke portion to respectively with two lateral walls of fixed slot to the cooperation, in order to realize the circumference location of stator tooth, when guaranteeing equipment intensity, promoted motor stator equipment's stability.

In any of the above technical solutions, preferably, the arc-shaped stator yoke is formed by stacking a plurality of stator yoke laminations in an axial direction.

In any one of the above technical solutions, preferably, when the plurality of stator modules are connected end to end along the circumferential direction, for two adjacent stator yoke portions, the splicing groove is formed at the tail end of one stator yoke portion, and the splicing tooth structure capable of being matched with the splicing groove is arranged at the head end of the other stator yoke portion.

In the technical scheme, the splicing grooves and the splicing tooth structures are respectively arranged in the matching areas of the two adjacent stator yoke parts, and the accurate positioning between the two adjacent stator yoke parts is realized through the matching of the splicing grooves and the splicing tooth structures.

The splicing groove can be a square groove, a T-shaped groove or a dovetail groove and the like.

In any one of the above aspects, preferably, the tooth claw portion is formed by two flank surfaces extending obliquely outward in the circumferential direction along the tooth waist portion, and a tooth tip surface provided between the two flank surfaces.

In this technical scheme, through forming the tooth claw portion structure by two flank sides that extend along the waist of tooth portion respectively to the outside slope and set up the triangle-shaped structure of establishing formation in the tooth terminal surface between two flank sides, through the tooth claw portion (being tooth boots portion) that two flank sides that extend respectively to the outside formed, on the one hand, set up the tooth boots portion great, can promote and gather magnetic efficiency, and then can guarantee the winding around the stability of establishing, and then guarantee motor operating performance.

In any of the above-described aspects, preferably, the sectional shape of the fixing groove is configured to be any one of a rectangle, a U-shape, and a trapezoid.

In this technical solution, the cross section of the fixing groove may be changed by a structural form and with a change in the cross-sectional shape of the stator yoke portion.

Preferably, the fixing groove has a rectangular or trapezoidal sectional shape.

In any of the above technical solutions, preferably, the length of the side wall of the fixing groove far away from the tooth waist portion is less than or equal to the length of the side wall near the tooth waist portion.

In the technical scheme, the side wall far away from the tooth waist part is mainly used for being matched with the stator yoke part and achieving mechanical fixing, at the moment, the length of the side wall far away from the tooth waist part can be smaller than or equal to that of the side wall close to the tooth waist part, and the length of the side wall far away from the tooth waist part is further reduced so as to set the length of the side wall to be smaller than that of the side wall close to the tooth waist part, so that the quality of the whole motor stator can be effectively reduced.

And for the lateral wall that is close to the tooth waist, form the fixed slot with the lateral wall cooperation that is far away from the tooth waist in order to realize carrying out mechanical fastening between with the stator yoke portion, can convey the magnetic line of force that is passed over by the tooth waist to the stator yoke portion in, consequently through setting up the lateral wall that is close to the tooth waist to longer limit, can effectively increase magnetic permeability.

In any of the above technical solutions, preferably, an axial thickness of a side wall of the fixing groove far from the tooth waist portion is less than or equal to an axial thickness of a side wall near the tooth waist portion.

In this technical scheme, set up to be less than the axial thickness of the lateral wall that is close to the tooth waist through the axial thickness of keeping away from the lateral wall of tooth waist with the fixed slot, on the one hand, through the axial thickness of the lateral wall of guaranteeing nearly tooth waist portion to ensure to convey the magnetic line of force that comes by tooth waist portion to the stator yoke portion, in order to improve the magnetic conduction effect, on the other hand, through the axial thickness of the lateral wall of injecing the tooth waist portion of keeping away from, when satisfying mechanical fastening's intensity, also be favorable to reducing motor stator's weight.

In any of the above technical solutions, preferably, an outer side surface of the tooth root portion opposite to the groove bottom of the fixing groove is flush with a side surface of one side of the tooth waist portion; or the side surface of the tooth root part provided with the fixing groove is flush with the side surface of the other side of the tooth waist part.

In this technical scheme, the relative position relation of multiple difference has between root of tooth and the flank portion, and then can realize root of tooth axial dimensions's adjustment, wherein, as a relative position relation, the lateral surface relative with the tank bottom of fixed slot on the root of tooth flushes the setting with the side of one side of flank portion, as another relative position relation, the side of fixed slot opening side flushes with the side of flank portion, on the basis of the joint between assurance stator tooth and the stator yoke portion, through the height that reduces the root of tooth, can realize that motor stator's whole subtracts weight.

In addition, in connection with the above description in which the sectional shape of the fixing groove is configured as any one of a rectangle, a U-shape, and a trapezoid, it is also possible to form the sectional configuration of the fixing groove into a different shape by changing the length of the side wall on the side away from the tooth waist portion by setting only the side wall of the fixing groove close to the tooth waist portion to be the same as the height of the tooth waist portion.

In any of the above technical solutions, preferably, corners of an outer contour line of the fixing groove are provided with chamfers to configure both side walls of the fixing groove into a trapezoidal structure or a triangular structure.

In this embodiment, since the magnetic flux leakage phenomenon generally occurs at the vertex angle of the outer contour line of the fixing groove, the magnetic flux leakage probability is reduced by setting the vertex angle to be a chamfer.

The technical solution of the second aspect of the present invention provides a motor, including: the electric machine stator of any one of the embodiments of the first aspect of the invention; and the motor rotor is sleeved with the motor stator, wherein the motor stator is an outer stator.

In this technical scheme, through setting up motor stator into outer stator, motor rotor sets up to the inner rotor to motor stator is arranged along circumference by a plurality of stator modules and is formed, owing to need not consider the axial thickness problem of inner rotor, consequently compares with external rotor motor, can reduce axial dimension.

In the above technical solution, preferably, the stator of the motor has n stator modules, wherein when the number of phases of the motor is m, the number of stator modules in each phase is n/m.

In the technical scheme, for a motor with n stator modules, the number of phases depends on the number of modules contained in each phase, if the number of modules in each phase is a, and a is an integer not less than 1, the total number m of the motor phases is n/a, when a is 1, each stator module represents one phase and is sequentially arranged along the circumferential direction, the space angle occupied by each phase is equal to the space angle occupied by each module, namely 360 °/n, if a is greater than 1, the phases are sequentially arranged in the sequence of one module in each phase when being arranged along the circumferential direction, the previous arrangement is repeated after m windings are arranged until a times of repetition, and in order to reduce back electromotive force harmonics and torque ripple, a and m are generally set to be integers greater than 1.

One or more technical solutions provided in the technical solution of the present application have at least the following technical effects or advantages:

by arranging the motor stator structure into a structure formed by a plurality of stator modules in the circumferential direction, and each stator module is formed by assembling an arc-shaped stator yoke part and stator teeth, on one hand, by optimizing the size of the arc-shaped stator yoke part and the assembling mode between the stator teeth and the arc-shaped stator yoke part, compared with the scheme of adopting an outer rotor motor in the prior art, the axial thickness of the motor stator can be favorably reduced, and further the axial thickness of the motor adopting the motor stator is reduced, so that the motor stator structure can be applied to the application occasions of low speed and large torque, such as a driving motor in a washing machine, which have limitation on the axial size of the motor but have no strict limitation on the radial size of the motor, on the other hand, by arranging the motor stator into a modularized splicing structure, the phase difference of induced voltage on a stator winding can be adjusted by adjusting the physical distance between the adjacent, and then can obtain the motor of required number of phases, on the other hand, inject the stator slot between two adjacent stator teeth, in winding and establishing the in-process, can wind stator winding and establish on stator tooth after, assemble stator tooth and arc stator yoke portion again, also can be after assembling stator tooth and arc stator yoke portion, carry out stator winding and establish, when promoting around establishing the flexibility, still be favorable to promoting the slot filling rate that stator winding was established in the stator slot, thereby be favorable to promoting the torque density of motor.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic structural view of a stator of an electrical machine according to an embodiment of the invention;

FIG. 2 shows a schematic structural diagram of a stator module according to one embodiment of the invention;

FIG. 3 illustrates a structural schematic view of a stator tooth according to one embodiment of the present invention;

FIG. 4 illustrates a schematic structural view of an arcuate stator yoke according to an embodiment of the present invention;

FIG. 5 illustrates a schematic structural view of an arcuate stator yoke according to another embodiment of the present invention;

figure 6 illustrates a schematic structural view of a ring stator yoke according to one embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:

1 motor stator, 10 stator modules, 102 arc stator yoke portion, 104 stator tooth, 106 stator winding, 1042 tooth claw portion, 1044 tooth waist portion, 1046 tooth root portion, 1046A fixed slot, 1046B first side wall, 1046C second side wall, 1046D chamfer, 1022 draw-in groove structure, 1024 concatenation groove, 1026 concatenation tooth.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Stator tooth laminations and stator teeth according to some embodiments of the invention are described below with reference to fig. 1-6.

As shown in fig. 1 and 2, a stator 1 of an electric machine according to an embodiment of the present invention includes: a plurality of circumferentially arranged stator modules 10, the stator modules 10 comprising: an arcuate stator yoke 102; the stator teeth 104 can be assembled on the arc-shaped stator yoke 102 in a matching manner, the stator teeth 104 sequentially comprise a tooth claw part 1042, a tooth waist part 1044 and a tooth root part 1046 which are connected with each other from inside to outside along the radial direction, and the tooth claw part 1042 and the tooth root part 1046 axially extend outwards relative to the tooth waist part 1044; the stator winding 106 is correspondingly wound on the tooth waist 1044, wherein the stator modules 10 are circumferentially arranged by splicing the adjacent two arc-shaped stator yoke parts 102 end to end in the circumferential direction.

In this embodiment, by configuring the motor stator 1 as a structure formed by arranging a plurality of stator modules 10 along the circumferential direction, and assembling each stator module 10 by one arc-shaped stator yoke 102 and one stator tooth 104, on one hand, by optimizing the size of the arc-shaped stator yoke 102 and the assembling manner between the stator tooth 104 and the arc-shaped stator yoke 102, compared with the scheme of adopting an external rotor motor in the prior art, the axial thickness of the motor stator 1 can be reduced, and further, the axial thickness of the motor adopting the motor stator 1 can be reduced, so that the motor can be applied to the application occasions of low-speed and high-torque, such as a driving motor in a washing machine, where the axial size of the motor is limited but the radial size of the motor is not strictly limited, and on the other hand, by configuring the motor stator 1 as a modular splicing structure, the physical distance between the adjacent stator modules 10 can be adjusted, the phase difference of induced voltage on the stator winding 106 is adjusted, and then the motor with required phase number can be obtained, on the other hand, a stator slot is defined between two adjacent stator teeth 104, in the winding process, the stator winding 106 can be wound on the stator teeth 104 and then assembled with the stator teeth 104 and the arc-shaped stator yoke 102, the stator winding 106 can be wound after the stator teeth 104 and the arc-shaped stator yoke 102 are assembled, the winding flexibility is improved, meanwhile, the winding slot fullness rate of the stator winding 106 in the stator slot is favorably improved, and therefore the torque density of the motor is favorably improved.

The stator teeth are assembled on the arc-shaped stator yoke portion, various realization forms can be provided, for example, the stator teeth and the arc-shaped stator yoke portion can be assembled in a butt joint mode along the radial direction, specifically, inserting structures matched with each other can be respectively arranged on the tooth root portion and the arc-shaped stator yoke portion, and the stator teeth and the arc-shaped stator yoke portion are assembled in a butt joint mode along the radial direction.

The assembly can also be realized by mutually sleeving, specifically, a fixed groove can be formed in the tooth root part, the assembly can be realized by sleeving the arc-shaped stator yoke part in the fixed groove, a circumferential fixed groove can also be formed in the arc-shaped stator yoke part, and the tooth root part is sleeved in the circumferential fixed groove.

In addition, slot paper or an insulating frame can be used for insulation between the stator winding 106 and the stator yoke and between the stator teeth 104.

The stator module 10 may be manufactured using a plastic-clad process.

In the above embodiment, as shown in fig. 6, preferably, two adjacent stator modules 10 may be connected to each other, and when a plurality of stator modules 10 are connected end to end in the circumferential direction to construct the motor stator 1 forming an integral structure, each of the arc-shaped stator yoke portions 102 has at least one stator tooth 104 thereon.

In the above embodiment, as shown in fig. 1, preferably, two adjacent stator modules 10 are independent from each other, and when a plurality of stator modules 10 are fixedly arranged independently from each other, each of the arc-shaped stator yoke portions 102 has at least two stator teeth 104.

In this embodiment, a plurality of stator modules are arranged along the circumferential direction, and two adjacent stator modules 10 may be connected to each other or may be independent of each other, and when connected to each other, each arc-shaped stator yoke 102 has at least one stator tooth 104, and when independent of each other, each arc-shaped stator yoke 102 has at least two stator teeth 104.

As shown in fig. 3 and 4, in the above embodiment, preferably, the root of the stator tooth 104 is provided with a fixing groove 1046A, wherein the stator tooth 104 is assembled with the arc-shaped stator yoke 102 by sleeving the arc-shaped stator yoke 102 in the fixing groove 1046A.

In this embodiment, the root of the stator tooth 104 is provided with the fixing groove 1046A, and the fixing groove 1046A is matched with the stator yoke portion to assemble the stator tooth 104 on the arc-shaped stator yoke portion 102, so that the assembling strength between the stator tooth 104 and the arc-shaped stator yoke portion 102 is satisfied, and the axial thickness or height of the stator yoke portion can be set as small as possible to satisfy the preparation requirement of the driving motor in the electric equipment such as the washing machine.

As shown in fig. 3, in any of the above embodiments, preferably, the stator teeth 104 are formed by stacking a plurality of stator tooth punching sheets along the circumferential direction, and the stator tooth punching sheets include: tooth claw portion 1042, tooth waist portion 1044 and tooth root portion 1046, tooth claw portion 1042, tooth waist portion 1044 and tooth root portion 1046 radially connect gradually from inside to outside, seted up fixed slot 1046A along the axial on tooth root portion 1046, fixed slot 1046A runs through two sides of tooth root portion 1046 along circumference, wherein, a plurality of stator teeth 104 can form stator module 10 with the structure through fixed slot 1046A and arc stator yoke portion 102 joint cooperation, tooth claw portion 1042 can enclose to establish along circumference and form the fitting surface with electric machine rotor complex.

In this embodiment, each stator tooth 104 is formed by laminating a plurality of stator tooth punching sheets, each stator tooth 104 may include a tooth root portion 1046, a tooth waist portion 1044 and a tooth claw portion 1042, the tooth root portion 1046 is used for being connected with a stator yoke portion, the tooth waist portion 1044 may be wound with a winding, the tooth claw portions 1042 may be circumferentially arranged to form a circumferential matching surface matching with a motor rotor, the stator tooth 104 is formed in a stator tooth punching sheet manner, and then a stator core structure is formed by combining with the stator yoke portion structure, and compared with a motor adopting the stator tooth 104 partially or completely made of a metallurgical material, the realization cost is lower.

As shown in fig. 4, in any of the above embodiments, preferably, the outer side wall and the inner side wall of the arc-shaped stator yoke portion 102 are respectively formed by a multi-segment straight surface along a circumferential splicing configuration.

In this embodiment, the portion of the arc-shaped stator yoke 102, which is matched with the fixing groove 1046A, is in a straight-face structure, so that the fixing groove 1046A and the stator yoke are fitted together, and the strength of the assembled motor stator 1 is improved.

As shown in fig. 5, in any of the above embodiments, preferably, the outer side wall and the inner side wall of the arc-shaped stator yoke 102 are arc surfaces, and the region on the arc surfaces, which is matched with the stator teeth 104, is recessed to form the slot structure 1022.

In this embodiment, the clamping groove structures 1022 are formed on the arc-shaped stator yoke portion 102 to be respectively matched with two side walls of the fixing groove 1046A, so as to realize circumferential positioning of the stator teeth 104, and the assembling stability of the motor stator 1 is improved while the assembling strength is ensured.

In any of the above embodiments, as shown in fig. 4 and 5, preferably, the arc-shaped stator yoke 102 is formed by stacking a plurality of stator yoke laminations in the axial direction.

In any of the above embodiments, as shown in fig. 5 and 6, preferably, when a plurality of stator modules 10 are connected end to end in the circumferential direction, for two adjacent stator yoke portions, a splicing groove 1024 is formed at the tail end of one stator yoke portion, and a splicing tooth 1026 structure capable of being matched with the splicing groove 1024 is arranged at the head end of the other stator yoke portion.

In this embodiment, by respectively providing the splicing groove 1024 and the splicing tooth 1026 structure in the matching region of two adjacent stator yoke portions, the accurate positioning between two adjacent stator yoke portions is realized through the matching of the splicing groove 1024 and the splicing tooth 1026 structure.

The splicing groove 1024 may be a square groove, a T-shaped groove, or a dovetail groove.

As shown in fig. 3, in any of the above embodiments, the claw portions 1042 are preferably formed by two tooth flanks extending obliquely outward in the circumferential direction along the waist portion 1044 and a tooth end face disposed between the two tooth flanks.

In this embodiment, the claw portions 1042 are configured to form a triangular structure formed by two tooth flanks extending obliquely outward along the tooth waist portions 1044 respectively and a tooth end face arranged between the two tooth flanks, and the claw portions 1042 (i.e., the tooth shoe portions) formed by the two tooth flanks extending outward respectively are arranged to a larger extent, so that the magnetic flux collection efficiency can be improved, the winding stability can be ensured, and the motor operation performance can be ensured.

In any of the above embodiments, it is preferable that the sectional shape of the fixing groove 1046A is configured as any one of a rectangle, a U shape, and a trapezoid.

In this embodiment, the cross section of the fixing groove 1046A may be changed by a structural form and as a cross-sectional shape of the stator yoke portion is changed.

Preferably, the fixing groove 1046A has a rectangular or trapezoidal sectional shape.

In any of the above embodiments, preferably, the length of the fixing slots 1046A away from the side wall of the lumbar gear portion 1044 is less than or equal to the length of the side wall close to the lumbar gear portion 1044.

In this embodiment, the side wall (the second side wall 1046C) far from the tooth waist 1044 is mainly used for cooperating with the stator yoke and achieving mechanical fixation, at this time, the length of the second side wall 1046C may be less than or equal to the length of the side wall (the first side wall 1046B) near the tooth waist 1044, and the length of the second side wall 1046C is further reduced to set the length of the second side wall 1046C to be less than the length of the first side wall 1046B, so that the mass of the whole motor stator 1 can be effectively reduced.

As for the first side wall 1046B, while the fixing groove 1046A is formed in cooperation with the second side wall 1046C to realize mechanical fixing with the stator yoke, magnetic lines of force transmitted from the waisted tooth portion 1044 can be transmitted into the stator yoke, and therefore, by setting the first side wall 1046B to be a longer side, a magnetic conduction effect can be effectively increased.

In any of the above embodiments, preferably, the axial thickness of the side wall of the fixing groove 1046A away from the tooth waist portion 1044 is less than or equal to the axial thickness of the side wall close to the tooth waist portion 1044.

In this embodiment, by setting the axial thickness of the second side wall 1046C to be smaller than the axial thickness of the first side wall 1046B, on one hand, by ensuring the axial thickness of the first side wall 1046B, it is ensured that magnetic lines of force transmitted from the tooth waist 1044 are transmitted to the stator yoke, so as to improve the magnetic permeability, and on the other hand, by defining the axial thickness of the second side wall 1046C, while satisfying the strength of mechanical fixation, it is also advantageous to reduce the weight of the motor stator 1.

In any of the above embodiments, preferably, the outer side surface of the tooth root portion 1046 opposite to the groove bottom of the fixing groove 1046A is flush with one side surface of the tooth waist portion 1044; or the side surface of the tooth root 1046 on which the fixing groove 1046A is provided is flush with the side surface of the other side of the tooth waist 1044.

In this embodiment, there are multiple different relative position relations between tooth root portion 1046 and tooth waist portion 1044, and then can realize the adjustment of tooth root portion 1046 axial dimension, wherein, as a relative position relation, the lateral surface that is relative with the tank bottom of fixed slot 1046A on tooth root portion 1046 flushes the setting with the side of one side of tooth waist portion 1044, as another relative position relation, the lateral surface on the side of fixed slot 1046A opening flushes with the side of tooth waist portion 1044, on the basis of guaranteeing the joint between stator tooth 104 and the stator yoke portion, through reducing the height of tooth root portion 1046, can realize that motor stator 1's whole subtracts weight.

In addition, in connection with the above description that the sectional shape of the fixing groove 1046A is configured as any one of a rectangle, a U shape, and a trapezoid, it is also possible to set only the side wall of the fixing groove 1046A close to the tooth waist 1044 to be the same as the height of the tooth waist 1044, and to form the sectional configuration of the fixing groove 1046A into a different shape by changing the length of the side wall on the side far from the tooth waist 1044.

In any of the above embodiments, it is preferable that a chamfer 1046D is provided at a vertex of an outer contour line of the fixing groove 1046A to configure both side walls of the fixing groove 1046A in a trapezoidal structure or a triangular structure.

In this embodiment, since the magnetic leakage phenomenon generally occurs at the top corners of the outer contour line of the fixing groove 1046A, the magnetic leakage probability is reduced by providing the top corners with chamfers 1046D.

As shown in fig. 1 to 6, according to an embodiment of the present invention, the motor stator 1 includes six stator modules 10, and when the motor is a three-phase motor, there are two stator modules 10 for each phase, and in each stator module 10, the motor windings 106 are arranged in the circumferential direction in the order of 1-2-3-1-2-3, that is, in the order of one stator module 10 for each of the three phases, and the arrangement is repeated.

Further, each stator module 10 includes six stator teeth 104, six windings 106, and an arc-shaped stator yoke 102, so that the total number of the stator teeth 104 is 36, the stator teeth 104 are silicon steel sheets stacked in the circumferential direction, and the arc-shaped stator yoke is stacked in the circumferential direction.

Further, the tooth root of the stator tooth 104 is provided with a fixing groove 1046A for being sleeved on the arc-shaped stator yoke portion 102 to realize mechanical cooperation of the tooth yoke, as shown in fig. 5, the arc-shaped stator yoke portion 102 may be provided with a slot structure 1022 for being matched with the stator tooth 104, as shown in fig. 4, the arc-shaped stator yoke portion 102 may also be provided with no slot, the upper edge and the lower edge are a plurality of concentric straight line segments, and the stator tooth is directly clamped on the upper straight line segment and the lower straight line segment. The arc-shaped stator yoke portions 102 between two adjacent stator modules 10 can be spliced together in a certain form, such as by splicing slots of a square slot, a T-shaped slot, a dovetail slot, etc. and corresponding splicing teeth, and the stator winding 106 is wound on the stator teeth 104.

An electric machine according to an embodiment of the invention comprises: the motor stator according to the above embodiment; and the motor rotor is sleeved with the motor stator, wherein the motor stator is an outer stator.

In this embodiment, by providing the motor stator as the outer stator, the motor rotor as the inner rotor, and the motor stator formed by arranging the plurality of stator modules in the circumferential direction, since it is not necessary to consider the problem of the axial thickness of the inner rotor, the axial size can be reduced as compared with an outer rotor motor.

In the above embodiment, it is preferable that there are n stator modules in the stator of the motor, wherein when the number of phases of the motor is m, the number of stator modules in each phase is n/m.

In this embodiment, for a motor having n stator modules, the number of phases depends on the number of modules included in each phase, if the number of modules in each phase is a, and a is an integer not less than 1, the total number of motor phases m is n/a, if a is 1, each stator module represents one phase, and the stator modules are sequentially arranged along the circumferential direction, the spatial angle occupied by each phase is equal to the spatial angle occupied by each module, i.e., 360 °/n, if a is greater than 1, when the stator modules are arranged along the circumferential direction, the phases are sequentially arranged in the order of one module in each phase, after m windings are arranged, the previous arrangement is repeated until a times are repeated, and in order to reduce back electromotive force harmonics and torque ripple, a and m are usually set to an integer greater than 1.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. An electric machine stator, comprising:

a plurality of circumferentially arranged stator modules, the stator modules comprising:

an arcuate stator yoke;

stator teeth capable of being fitted and assembled on the arc-shaped stator yoke, the stator teeth sequentially comprising a claw portion, a tooth waist portion and a tooth root portion connected to each other in the radial direction from the inside to the outside, the claw portion and the tooth root portion extending axially outward relative to the tooth waist portion;

and the stator winding is correspondingly wound on the tooth waist part.

2. The motor stator of claim 1,

when a plurality of the stator modules are connected end to end in the circumferential direction to construct the motor stator which forms an integral structure, each arc-shaped stator yoke part is provided with at least one stator tooth;

when the plurality of stator modules are fixedly arranged independently, each arc-shaped stator yoke part is provided with at least two stator teeth.

3. The motor stator of claim 2,

a fixing groove is axially arranged on the tooth root part and penetrates through two side surfaces of the tooth root part along the circumferential direction,

the stator teeth can be matched with the arc-shaped stator yoke portion in a clamping mode through the fixing grooves to form the stator module, and the claw portions can be circumferentially arranged to form matching surfaces matched with the motor rotor.

4. The motor stator of claim 3,

the outer side wall and the inner side wall of the arc-shaped stator yoke portion are formed by splicing a plurality of sections of straight surfaces along the circumferential direction.

5. The motor stator of claim 3,

the outer side wall and the inner side wall of the arc-shaped stator yoke portion are arc surfaces, and the arc surfaces and the areas matched with the stator teeth are formed into clamping groove structures matched with the fixing grooves through concave arrangement.

6. The motor stator of claim 3,

the arc stator yoke is formed by stacking a plurality of stator yoke punching sheets along the axial direction.

7. The motor stator of claim 6,

when a plurality of stator modules are connected end to end along the circumferential direction, for two adjacent stator yoke parts, a splicing groove is formed in the tail end of one stator yoke part, and a splicing tooth structure matched with the splicing groove is arranged at the head end of the other stator yoke part.

8. The motor stator of claim 3,

the claw portion is formed by two tooth side surfaces which respectively extend along the tooth waist portion in an inclined manner along the circumferential direction towards the outside and a tooth end surface arranged between the two tooth side surfaces in an enclosing manner.

9. The motor stator according to any one of claims 3 to 8,

the sectional shape of the fixing groove is configured to be any one of a rectangle, a U-shape, and a trapezoid.

10. The motor stator according to any one of claims 3 to 8,

the length of the side wall of the fixing groove far away from the tooth waist part is smaller than or equal to the length of the side wall close to the tooth waist part.

11. The motor stator according to any one of claims 3 to 8,

the axial thickness of the side wall of the fixing groove far away from the tooth waist part is smaller than or equal to the axial thickness of the side wall close to the tooth waist part.

12. The motor stator according to any one of claims 3 to 8,

the outer side face of the tooth root, which is opposite to the groove bottom of the fixing groove, is flush with the side face of one side of the tooth waist part; or

The side surface of the tooth root part, provided with the fixing groove, is flush with the side surface of the other side of the tooth waist part.

13. The motor stator according to any one of claims 3 to 8,

and a chamfer angle is arranged at the vertex angle of the outer contour line of the fixing groove so as to construct the side walls at two sides of the fixing groove into a trapezoidal structure or a triangular structure.

14. An electric machine, comprising:

an electric machine stator as claimed in any one of claims 1 to 13;

a motor rotor sleeved with the motor stator,

the motor stator is an inner stator or an outer stator.

15. The electric machine of claim 14,

the stator of the motor is provided with n stator modules,

when the number of phases of the motor is m, the number of the stator modules in each phase is n/m.

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