CN220874280U - Stator assembly and axial magnetic field motor - Google Patents

Abstract

The utility model provides a stator assembly and an axial magnetic field motor, wherein the stator assembly comprises a shell, the shell comprises two end plates and a stator core arranged between the two end plates, the stator core comprises a plurality of stator teeth and magnetizers, and the magnetizers are connected between two adjacent stator teeth, so that the stator teeth are assembled in the circumferential direction to form the stator core; the adjacent surfaces of the two end plates are respectively provided with a clamping groove, and the tooth end surfaces of the stator teeth are clamped in the clamping grooves. The stator core is assembled into a whole through the plurality of stator teeth and the magnetizers, the tooth end face of each stator tooth is clamped in the clamping groove of the end plate, compared with the traditional scheme of fixing the stator teeth on the end plate by bolts, the silicon steel sheet layering and interlayer sliding phenomena of the stator core are effectively avoided, the silicon steel sheet fault can not be formed, and the service performance of the stator core is ensured.

Description

Stator assembly and axial magnetic field motor

Technical Field

The utility model relates to the technical field of motors, in particular to a stator assembly and an axial magnetic field motor.

Background

The axial magnetic field motor has the characteristics of high torque density, high power density and the like because of the large air gap plane and compact structure. Compared with the traditional radial motor, the axial magnetic field motor has obvious application advantages in application scenes with limit requirements on size, weight and the like, and is easy to integrate in occasions with high space utilization rate requirements such as electric automobiles.

An axial field motor includes a stator that generates a magnetic field through windings and a rotor that is rotated by the magnetic field. The stator comprises a stator core and a stator plate, wherein the stator core is formed by winding a silicon steel belt to form axial magnetic flux, and when the stator core and the stator plate are assembled, the stator core and the stator plate are axially fixed through bolts, however, the bolts are fixed to easily cause the problems of layering and interlayer sliding of the stator core, and the bolt holes also influence the magnetic circuit performance of the electronic core.

Disclosure of utility model

Accordingly, an objective of the present utility model is to provide a stator assembly and an axial magnetic field motor, so as to solve the above-mentioned technical problems in the related art.

The utility model provides a stator assembly, which comprises a shell, wherein the shell comprises two end plates and a stator core arranged between the two end plates, the stator core comprises a plurality of stator teeth and a magnetizer, and the magnetizer is connected between two adjacent stator teeth, so that the stator teeth are assembled in the circumferential direction to form the stator core;

the adjacent surfaces of the two end plates are respectively provided with a clamping groove, and the tooth end surfaces of the stator teeth are clamped in the clamping grooves.

Further, the stator assembly, wherein, two adjacent stator teeth are equipped with the portion of assembling on the side that is opposite, assemble the portion along stator core's radial extension, the magnetic conductor can with it is fixed to assemble the portion cooperation to link up two adjacent stator teeth.

Further, the stator assembly, wherein the assembly part is arranged close to the upper end face and/or the lower end face of the stator teeth.

Further, the stator assembly is characterized in that the assembling part is of a groove structure, and protruding structures matched with the groove structure are arranged on two opposite axial sides of the magnetizer.

Further, the stator assembly, wherein the groove structure is any one of a V-groove, a U-groove, a T-groove or an L-groove.

Further, the stator assembly, wherein the distance between the magnetizer and the end face of the stator tooth is greater than or equal to the depth of the clamping groove.

Further, the stator assembly, wherein the magnetizer comprises a plurality of fiber cloths which are stacked and arranged, and a magnetic material arranged between two adjacent fiber cloths.

Further, the stator assembly, wherein, the axial both sides of end plate are equipped with stator face and rotor face respectively, the rotor face level sets up, the stator face is sunken to be set up the draw-in groove, the draw-in groove the shape with the profile looks adaptation of stator tooth.

Further, the stator assembly, wherein, two connect fixedly through fastening structure between the end plate, fastening structure is including locating shell and the inner shell between two end plates, the shell is connected in two outward flange between the end plate, the inner shell is connected in two inward flange between the end plate, be provided with on the end plate with the outer retaining ring of the inward flange block of shell and with the inner retaining ring of the outward flange block of inner shell, two the end plate with the inner shell the shell passes through the fastener to be connected fixedly.

The utility model also provides an axial magnetic field motor, which comprises the stator assembly in the technical scheme.

Compared with the prior art, the utility model has the beneficial effects that:

1. The stator core is assembled into a whole through the plurality of stator teeth and the magnetizers, the tooth end face of each stator tooth is clamped in the clamping groove of the end plate, compared with the traditional scheme of fixing the stator teeth on the end plate by bolts, the silicon steel sheet layering and interlayer sliding phenomena of the stator core are effectively avoided, the silicon steel sheet fault can not be formed, and the service performance of the stator core is ensured.

2. The magnetizer not only plays a role in fixing and supporting the stator teeth, but also can play a role in a magnetic circuit channel of the yoke part of the stator core, and no extra yoke magnetizer is needed to be added, so that the magnetic conductivity of the stator core is ensured.

3. The magnetizer has certain magnetic conductivity, and slows down the degree of the severe change of the magnetic field at each position of the circumferential direction of the air gap, thereby reducing the alternating current copper consumption of the winding flat wire, improving the capability of generating torque by unit current under the working condition of medium and small load, improving the efficiency, reducing the amplitude of low-order electromagnetic waves existing in the motor and improving the NVH (noise vibration and harshness) characteristic of the motor.

Drawings

FIG. 1 is an exploded view of a stator assembly according to an embodiment of the present utility model at a first viewing angle;

FIG. 2 is an exploded view of a stator assembly according to an embodiment of the present utility model at a second view;

fig. 3 is a schematic structural diagram of a stator core according to an embodiment of the present utility model;

FIG. 4 is a side view of a stator tooth in an embodiment of the utility model;

FIG. 5 is a schematic diagram showing a structure of a magnetizer according to an embodiment of the present utility model;

FIG. 6 is a schematic view showing a specific structure of an end plate according to an embodiment of the present utility model;

FIG. 7 is a schematic view showing the structure of another end plate according to an embodiment of the present utility model;

Description of main reference numerals:

10. An end plate; 11. a stator face; 12. a rotor face; 20. a magnetizer; 30. stator teeth; 41. a clamping groove; 51. a winding; 52. a wire outlet hole; 53. binding posts; 61. an outer retainer ring; 62. an inner retainer ring; 71. a housing; 72. an inner case; 81. a threaded hole; 82. a mounting hole; 83. a bolt; 91. an assembling part; 92. a bump structure.

The utility model will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Several embodiments of the utility model are presented in the figures. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the stator assembly of the present utility model includes a housing, the housing includes two end plates 10 and a stator core disposed between the two end plates 10, the stator core includes a plurality of stator teeth 30 and a magnetizer 20, the magnetizer 20 is connected between two adjacent stator teeth 30, so that the stator teeth 30 are assembled along a circumferential direction to form the stator core;

The two end plates 10 are provided with clamping grooves 41 on one surface adjacent to each other, the tooth end surfaces of the stator teeth 30 are clamped in the clamping grooves 41 on the two end surfaces, and preferably, the tooth end surfaces of the stator teeth 30 are adhered and fixed with the clamping grooves 41 through an adhesive.

It can be appreciated that in this embodiment, the stator core is assembled into a whole by the plurality of stator teeth 30 and the magnetizer 20, and the tooth end face of each stator tooth 30 is clamped in the clamping groove 41 of the end plate 10, so that compared with the scheme that the stator teeth 30 are fixed on the end plate 10 by using bolts 83 in the prior art, the lamination and interlayer sliding phenomena of silicon steel sheets of the stator core are effectively avoided, the silicon steel sheet faults are not formed, and the service performance of the stator core is ensured.

In the present embodiment, the end plate 10 is made of a high-strength fiber-reinforced composite material, and the magnetizer 20 is a structure in which a plurality of glass fiber cloths are laminated and magnetic materials are uniformly dispersed between every two glass fiber cloths, and is filled with resin and shaped. Wherein the magnetic material may be iron powder.

In this embodiment, the magnetizer 20 is mainly composed of resin, iron powder and glass fiber cloth, wherein the proportion of the first three components determines the magnetic conductivity and mechanical property, and the proportion is determined according to specific use requirements, such as 60% -80% of iron powder, 15% -30% of resin and 5% -15% of glass fiber.

The preparation method of the magnetizer 20 in this embodiment is as follows:

(1) Preparing resin glue solution: uniformly mixing a resin matrix with a curing agent to prepare a resin glue solution or a resin adhesive film;

(2) Preparing prepreg cloth: impregnating glass fiber cloth with resin glue solution or carrying out composite impregnation with a resin glue film by using equipment to obtain resin-impregnated glass fiber cloth (prepreg cloth);

(3) Dispersing magnetic material: uniformly spreading a layer of magnetic material on a layer of prepreg cloth according to a proportion by manpower or a machine to obtain the prepreg cloth uniformly spreading the magnetic material;

(4) Laminating prepreg cloth: paving a layer of prepreg cloth on the prepreg uniformly paved with the magnetic materials, and continuously paving a layer of magnetic materials; repeating the steps until the required thickness is reached;

(5) Lamination and curing: the laminated prepreg cloth with the magnetic material spread thereon is placed on a press, and is molded by heating and curing to obtain the desired magnetizer 20.

As shown in fig. 3 to 5, the assembling portions 91 are provided on opposite sides of the two adjacent stator teeth 30, the assembling portions 91 extend along the radial direction of the stator core, and the magnetizer 20 can be fixed in cooperation with the assembling portions 91, so as to connect the two adjacent stator teeth 30. Specifically, the assembling portion 91 is a groove structure, and the magnetizer 20 can extend into the groove structure along the radial direction of the stator teeth 30, so that the stator teeth 30 are assembled along the circumferential direction to form a stator core, wherein the magnetizer 20 and the stator teeth 30 are not limited to the concave-convex fit, but can be clamped fit, and the embodiment is merely illustrative and not limiting.

It should be noted that, in order to ensure the stability of the connection between the magnetic conductor 20 and the stator teeth 30, a magnetic conductive glue should be disposed in the groove structure of the stator teeth 30, so that a magnetic conductive loop can be formed between the stator teeth 30 and the magnetic conductor 20 while ensuring the connection stability.

As shown in fig. 1 and 4, two groove structures are respectively disposed on two axial sides of the stator teeth 30, two magnetizers 20 are disposed between the two stator teeth 30, one magnetizer 20 is disposed near an upper end face of the stator teeth 30, the other magnetizer 20 is disposed near a lower end face of the stator teeth 30, and a winding 51 on the stator teeth 30 is disposed between the upper and lower magnetizers 20.

Specifically, when the stator core is assembled, the magnetizer 20 is inserted into the groove structure on one axial side of the stator teeth 30 to form an integral stator core, the stator core at the moment is provided with an open slot, the winding 51 can be wound between each stator tooth 30 through the open slot, and finally, the magnetizer 20 is inserted into the groove structure on the other axial side of the stator teeth 30, so that the assembly of the stator core is completed, and in the assembly process, the open slot does not influence the assembly difficulty and efficiency of the winding 51, and compared with the stator structure of the traditional semi-closed slot, the winding is simpler.

Further, since the magnetic conductor 20 has a certain magnetic conductivity, after the stator teeth 30 are assembled into a whole through the magnetic conductor 20, the magnetic conductor 20 not only plays a role in fixing and supporting the stator teeth 30, but also plays a role in bearing a magnetic circuit channel of a yoke part of the stator core, and no extra yoke part magnetic conductor 20 is required to be added, so that the magnetic conductivity of the stator core is ensured. Meanwhile, the magnetizer 20 also slows down the degree of the severe change of the magnetic field at each position in the circumferential direction of the air gap, thereby reducing the alternating current copper loss of the flat wire of the winding 51, improving the torque generating capacity of unit current under the working condition of medium and small load, improving the efficiency, reducing the amplitude of low-order electromagnetic force waves existing in the motor and improving the NVH (noise vibration harshness) characteristic of the motor.

In addition, in the present embodiment, since two magnetizers 20 are disposed between every two stator teeth 30 and the two magnetizers 20 are located at two axial sides of the winding 51, the stator core forms a closed slot stator structure, which can more effectively close magnetic flux and reduce leakage of magnetic flux. This helps to improve the magnetic circuit efficiency of the motor and reduce energy loss.

As shown in fig. 3, since the open slot between two adjacent stator teeth 30 has a certain length, the magnetizer 20 in this embodiment is in a strip shape, the length of the magnetizer 20 is equal to the radial length of the stator teeth 30, and then, the protruding structures 92 matching with the groove structures are provided on two axially opposite sides of the magnetizer 20, specifically, as shown in fig. 5, the groove structures on the stator teeth 30 in this embodiment are V-shaped grooves, and the protruding structures 92 on two opposite sides of the magnetizer 20 are V-shaped protruding structures 92 corresponding to each other. In other embodiments, the groove structure may be a U-shaped groove, a T-shaped groove, or an L-shaped groove, and the shape of the groove structure is not limited in this embodiment, as long as the magnetizer 20 cannot move along the axial direction of the stator teeth 30 after being connected to the stator teeth 30.

Further, the distance between the magnetizer 20 and the tooth end surface of the stator tooth 30 is greater than or equal to the depth of the clamping groove 41. To ensure that the magnetic conductors 20 do not limit the axial insertion of the stator teeth 30 into the clamping grooves 41 of the end plate 10, ensuring the assembly effect.

On the other hand, a certain distance is reserved between the magnetizer 20 and the tooth end face of the stator tooth 30, and the magnetizer 20 and the tooth end face of the stator tooth 30 are not flush, so that the magnetic field is concentrated at the tooth end face due to the fact that the magnetizer 20 and the tooth end face of the stator tooth 30 are in too tight contact, and the magnetic field leakage loss is further increased. By reserving a certain distance, the concentration degree of the magnetic field can be reduced, the magnetic leakage loss is reduced, and the efficiency of the motor is improved.

In this embodiment, the windings 51 include coils disposed on each of the stator teeth 30, and the coils on each of the stator teeth 30 are connected by a bridge wire to form a three-phase winding, so that 3 wire holes 52 are disposed on one of the end plates 10 to correspond to the extraction of the U, V, W-phase binding posts 53 in the winding 51 assembly, although in other embodiments, the windings 51 may be two-phase or six-phase, and this embodiment is merely illustrative and not limiting.

In this embodiment, each phase winding 51 is composed of a plurality of coils and bridge wires, the number of coils is equal to that of the stator teeth 30, and each phase winding 51 has no welding point, so that the risk caused by welding is avoided, the winding 51 can be directly mounted on the stator core, one end of each phase winding 51 is welded on the binding post 53 through a copper sleeve, the other end is welded together to form a neutral point, and the star connection of the three-phase winding of the motor is formed.

As shown in fig. 6 and 7, the two axial sides of the end plate 10 are respectively provided with a stator surface 11 and a rotor surface 12, where the rotor surface 12 is horizontally disposed, the stator surface 11 is concavely provided with the clamping groove 41, when the stator teeth 30 are assembled in the clamping groove 41, the tooth end surfaces of the stator teeth 30 are located between the stator surface 11 and the rotor surface 12, the distance between the tooth end surfaces of the stator teeth 30 and the rotor surface 12 is smaller, the electromagnetic air gap length is effectively reduced, the magnetic resistance between the motor rotor and the stator can be reduced, thereby reducing hysteresis loss and iron loss, and under small and medium load, the capability of generating torque per unit current can be improved, thereby improving the motor efficiency.

The degree of the severe change of the magnetic field at each position in the circumferential direction of the air gap is slowed down, so that the amplitude of low-order electromagnetic waves existing in the motor is reduced, and the NVH (noise vibration harshness) characteristic of the motor is improved.

In this embodiment, the shape of the clamping groove 41 is adapted to the contour of the stator teeth 30, the stator teeth 30 are trapezoidal, the width of the stator teeth 30 gradually increases from inside to outside along the radial direction, and correspondingly, the shape of the clamping groove 41 is also trapezoidal. When the stator teeth 30 are axially inserted into the clamping grooves 41, the outer walls of the stator teeth 30 are tightly attached to the inner walls of the clamping grooves 41, so that the stator teeth 30 are fixed on the end plate 10 in the radial direction.

In this embodiment, the two end plates 10 are connected and fixed by a fastening structure, so that the stator core is sandwiched between the two end plates 10. Specifically, as shown in fig. 1, the fastening structure includes an outer shell 71 and an inner shell 72 disposed between two end plates 10, wherein the end plates 10 are substantially annular, the outer shell 71 is connected to an outer edge between the two end plates 10, the inner shell 72 is connected to an inner edge between the two end plates 10, and the end plates 10, the inner shell 72 and the outer shell 71 can be connected and fixed by fasteners, so that a closed stator cavity is formed between the outer shell 71 and the inner shell 72, and the stator core is installed in the stator cavity.

In the present embodiment, the fastening member is a bolt 83, but not limited thereto, and may be a screw or the like. Specifically, a plurality of screw holes 81 are provided on both the front and back surfaces of the inner case 72 and the front and back surfaces of the outer case 71, mounting holes 82 corresponding to the screw holes 81 are provided on the end plate 10, and bolts 83 pass through the mounting holes 82 to be screwed to the screw holes 81, thereby fixing the end plate 10 to the front and back surfaces of the outer case 71 and the inner case 72, the stator core is clamped and fixed between the two end plates 10, and the tooth end surfaces of the stator core are engaged in the engaging grooves 41 of the end plate 10, thereby ensuring the stability of the mounting position. That is, when the stator core is mounted, the mounting is performed by the locking groove 41 of the end plate 10, and the bolt holes do not need to be formed in the stator teeth 30, so that the magnetic circuit structure of the stator teeth 30 is not damaged, and the magnetic permeability of the stator core is ensured.

Further, in order to improve the installation positioning accuracy of the inner shell 72 and the outer shell 71 on the end plate 10, in this embodiment, the outer baffle ring 61 engaged with the inner edge of the outer shell 71 and the inner baffle ring 62 engaged with the outer edge of the inner shell 72 are further disposed on the end plate 10, and referring to fig. 1, 6 and 7, the inner baffle ring 62 is engaged with the inner edge of the outer shell 71 by the outer baffle ring 61, so as to effectively avoid offset dislocation when the end plate 10 is installed.

Further, referring to fig. 2, since the stator assembly is a stator assembly structure with a closed cavity, an outer ring runner is formed between the outer shell 71 and the stator teeth 30, an inner ring runner is formed between the inner shell 72 and the stator teeth 30, and an inter-tooth runner is formed between two adjacent stator teeth 30, the outer ring runner is communicated with the inner ring runner through the inter-tooth runner to form a flowing gap, and cooling oil can be introduced into the flowing gap, so that the cooling oil flows through the outer ring runner, the inter-tooth runner and the inner ring runner and directly contacts with the stator teeth 30 and the windings 51, thereby effectively reducing heat generated by the windings 51 and the stator teeth 30.

In other embodiments, a liquid inlet and a liquid outlet may be provided on one of the end plates 10, which are in communication with the stator cavity, the liquid inlet being for introducing cooling oil into the interior, and the liquid outlet being for extracting cooling oil from the flow gap. It will be appreciated that when the motor is running, cooling oil is introduced into the flow gap through one of the liquid inlets, and the other liquid outlet is used for heat exchange of the cooling oil in the flow gap and then is led out, and the led cooling oil is returned back to the housing after being cooled, so that the cooling oil flows to and fro in a circulating manner, and the heat generated by the stator teeth 30 and the windings 51 can be greatly reduced.

The liquid inlets and the liquid outlets can be flexibly arranged on the end plate 10, the flow of the cooling oil is adjusted according to the requirement, and the flow is adjusted according to the pipe diameter of each liquid inlet/outlet, so that the comprehensive heat dissipation effect is optimal.

In summary, in the stator assembly according to the above embodiment of the present utility model, the stator core is assembled into a whole by the plurality of stator teeth 30 and the magnetizer 20, and the tooth end surface of each stator tooth 30 is clamped in the clamping groove 41 of the end plate 10, so that compared with the conventional scheme of fixing the stator teeth 30 on the end plate 10 by using the bolts 83, the lamination and interlayer sliding phenomena of the silicon steel sheet of the stator core are effectively avoided, the silicon steel sheet fault is not formed, and the usability of the stator core is ensured.

The stator assembly in the second embodiment of the present utility model is different from the stator assembly in the first embodiment in that: the number of the assembling parts 91 is one, one assembling part 91 is close to the end face of the stator teeth 30, and only one magnetizer 20 is arranged between two adjacent stator teeth 30, so that an integral stator core is formed by circumferential splicing.

The third embodiment of the present utility model also provides an axial magnetic field motor, which includes the stator assembly described in the above technical scheme.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," 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 present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The stator assembly comprises a shell, wherein the shell comprises two end plates and a stator core arranged between the two end plates, and the stator assembly is characterized in that the stator core comprises a plurality of stator teeth and magnetizers, and the magnetizers are connected between two adjacent stator teeth, so that the stator teeth are assembled in the circumferential direction to form the stator core;

the adjacent surfaces of the two end plates are respectively provided with a clamping groove, and the tooth end surfaces of the stator teeth are clamped in the clamping grooves.

2. The stator assembly of claim 1, wherein adjacent two of said stator teeth are provided with mating portions on opposite sides thereof, said mating portions extending radially of said stator core, said magnetically permeable body being engageable with said mating portions to engage adjacent two of said stator teeth.

3. The stator assembly of claim 2, wherein the split is disposed proximate an upper and/or lower end face of the stator teeth.

4. A stator assembly according to claim 3 wherein the assembly portion is a recess structure and axially opposite sides of the magnetic conductor are provided with projection structures which mate with the recess structure.

5. The stator assembly of claim 4, wherein the groove structure is any one of a V-groove, a U-groove, a T-groove, or an L-groove.

6. The stator assembly of claim 1, wherein the distance between the magnetizer and the stator tooth end surface is greater than or equal to the depth of the clamping groove.

7. The stator assembly of claim 1 wherein the magnetic conductor comprises a plurality of fiber cloths in a stacked arrangement and a magnetic material disposed between adjacent two of the fiber cloths.

8. The stator assembly of claim 1, wherein two axial sides of the end plate are respectively provided with a stator surface and a rotor surface, the rotor surfaces are horizontally arranged, the stator surfaces are concavely provided with clamping grooves, and the shape of the clamping grooves is matched with the outline of the stator teeth.

9. The stator assembly according to claim 1, wherein the two end plates are fixedly connected by a fastening structure, the fastening structure comprises an outer shell and an inner shell arranged between the two end plates, the outer shell is connected to an outer edge between the two end plates, the inner shell is connected to an inner edge between the two end plates, an outer retainer ring clamped with an inner edge of the outer shell and an inner retainer ring clamped with an outer edge of the inner shell are arranged on the end plates, and the two end plates are fixedly connected with the inner shell and the outer shell by fasteners.

10. An axial field motor comprising a stator assembly as claimed in any one of claims 1 to 9.