CN109193978A - A kind of tooth yoke separation stator structure suitable for axial flux permanent magnet motor - Google Patents

Abstract

The invention discloses a yoke-separated stator structure suitable for an axial magnetic flux permanent magnet motor, which belongs to the field of axial magnetic flux permanent magnet motors, and is preferably provided with a "gear-shaped" stator yoke and a "wedge-shaped structure" The stator teeth are assembled and fixed on the stator yoke correspondingly by a plurality of stator teeth, so as to form a stator structure suitable for the axial magnetic flux permanent magnet motor. The tooth yoke separated stator structure suitable for the axial magnetic flux permanent magnet motor of the present invention has the advantages of simple forming of the stator teeth and the stator yoke, high forming precision and high forming efficiency, and can effectively simplify the forming process of the existing stator structure. The forming accuracy of the stator structure is improved, and the assembly of the stator teeth and the stator yoke is convenient, which can greatly improve the forming efficiency of the stator structure, reduce the processing cost of the stator structure of the axial flux permanent magnet motor, and promote the axial flux permanent magnet motor. It has good promotion and application value.

Description

A yoke-separated stator structure suitable for axial flux permanent magnet motors

technical field

The invention belongs to the field of axial magnetic flux permanent magnet motors, in particular to a yoke separation stator structure suitable for axial magnetic flux permanent magnet motors.

Background technique

With the continuous development of the economy and society and the increasing energy consumption, the use of permanent magnet excitation to replace electric excitation to save energy consumption has become a consensus around the world, thus promoting the rapid development of permanent magnet motors.

As a typical permanent magnet motor, the axial flux permanent magnet motor has an axial distribution of the air gap magnetic field. The stator and rotor are usually disc structures, which often have a larger radius, a smaller axial length, and a higher It has the characteristics of high power density, compact structure and small electromechanical time constant, and it is convenient to design into a multi-disc structure, which is easy to realize the improvement of motor torque and power density, so it is widely used in the drive motor of transportation equipment and servo systems.

In the prior art, the stator of the axial flux permanent magnet motor is generally made of silicon steel sheets, which are usually processed by the manufacturing method of punching and winding. Although this processing method can realize the stator to a certain extent However, the above-mentioned processing method has high cost, complicated process and difficult to guarantee accuracy, which increases the application cost of axial flux permanent magnet motor and limits the popularization and application of axial flux permanent magnet motor; therefore, reducing the The cost of flux permanent magnet motor stator and simplifying the manufacturing process of flux permanent magnet motor stator are very important to promote the development and application of axial flux permanent magnet motor.

SUMMARY OF THE INVENTION

Aiming at one or more of the above defects or improvement needs of the prior art, the present invention provides a yoke-separated stator structure suitable for an axial magnetic flux permanent magnet motor, which can realize the rapid and accurate assembly and molding of the stator structure , simplifies the forming process of the stator structure and reduces the processing cost of the stator structure.

In order to achieve the above purpose, the present invention provides a yoke-separated stator structure suitable for an axial magnetic flux permanent magnet motor, characterized in that the stator structure includes a stator yoke and a plurality of correspondingly assembled on the outer periphery of the stator yoke. on the stator teeth; wherein,

The stator yoke has a "gear-like" structure, and its outer peripheral ring is spaced upward with a plurality of tooth mounting grooves, and a yoke protrusion with a certain width is formed between the two tooth mounting grooves. The notch of the installation slot is reduced in turn from the outside to the inside, and the two sides of the yoke protrusion are respectively provided with first protrusions in the shape of a long strip and flush with the end surface of the yoke protrusion corresponding to the stator teeth. ;

The teeth of the stator are arranged corresponding to the installation slots of the teeth, which are wedge-shaped structures with a trapezoidal cross-section, and the bottoms of a pair of wedge-shaped sides that form a certain angle with each other correspond to the first two sides of the installation slots of the teeth respectively. A protruding block is provided with a second protruding block, and the second protruding block can abut the bottom surface of the first protruding block with a top surface and a side surface respectively after the stator teeth are correspondingly embedded in the teeth mounting grooves. and the protruding side surface of the yoke, so as to realize the fixing of the stator teeth in the corresponding tooth installation slots; then a plurality of the stator teeth can be sequentially embedded in the corresponding tooth installation slots and fixed, thereby forming Stator structure suitable for axial flux permanent magnet motors.

As a further improvement of the present invention, the top of the stator teeth is provided with a torque reducing slot of a certain depth, so as to reduce the cogging torque of the motor.

As a further improvement of the present invention, the torque reducing slot is opened in the center of the top of the stator teeth, and the structures on both sides of the torque reducing slot are symmetrical about the axis of the torque reducing slot.

As a further improvement of the present invention, the tops of the two wedge-shaped sides are respectively provided with convex structures that are flush with the top surfaces of the stator teeth, so that the vertical section of the stator teeth is "I"-shaped.

As a further improvement of the present invention, there is a certain distance between the protruding structures on the tops of adjacent two stator teeth, and a stator slot for accommodating coils is formed between the two stator teeth.

As a further improvement of the present invention, the included angle between the two wedge-shaped sides is 15°, 20°, 30°, or 36°, more preferably 30°.

As a further improvement of the present invention, the number of teeth mounting slots on the stator yoke is 12, and correspondingly, the number of the stator teeth is 12.

As a further improvement of the present invention, the stator tooth portion and the stator yoke portion are secured by bonding with an adhesive or secured by an interference fit.

As a further improvement of the present invention, the stator yoke is formed by stacking silicon steel sheets of two shapes and sizes in the axial direction.

As a further improvement of the present invention, the stator teeth are molded by soft magnetic composite material.

The above improved technical features can be combined with each other as long as they do not conflict with each other.

In general, compared with the prior art, the above technical solutions conceived by the present invention have the following beneficial effects:

(1) The yoke-separated stator structure suitable for the axial flux permanent magnet motor of the present invention is preferably provided with a “gear-shaped” stator yoke and a “wedge-shaped” stator tooth. By preferably setting the stator teeth The structure and size of the stator parts allow multiple stator teeth to be assembled and fixed on the stator yoke correspondingly, so as to form a stator structure suitable for the axial flux permanent magnet motor, and the two adjacent stator teeth on the stator structure are between the teeth. It can correspond to form the stator slot for accommodating the coil, and realize the rapid assembly and molding of the stator structure. The molding accuracy and molding efficiency of the stator structure are high. Compared with the existing stator structure molding process, the molding of the stator structure is greatly simplified. The technology improves the precision and efficiency of forming, and ensures the efficient and stable application of the stator structure;

(2) The yoke-separated stator structure suitable for the axial flux permanent magnet motor of the present invention can effectively reduce the operating time of the axial flux permanent magnet motor by opening a corresponding torque reducing slot in the center of the top of the stator teeth. The cogging torque improves the stability of the stator structure application, reduces the generation of noise and vibration, and ensures the stable operation of the motor;

(3) The yoke-separated stator structure suitable for the axial magnetic flux permanent magnet motor of the present invention, the stator yoke can be formed by stacking two kinds of silicon steel sheets in the axial direction, the forming of the stator yoke is simple and convenient, and the forming The precision control in the process is high, and the stator teeth can be molded by soft magnetic composite materials, which has strong forming flexibility and high forming efficiency, thus ensuring the forming accuracy of the stator structure after the stator teeth and the stator yoke are matched and assembled. Improve the application stability of the stator structure;

(4) The yoke-separated stator structure suitable for the axial magnetic flux permanent magnet motor of the present invention has simple forming of the stator teeth and the stator yoke, high forming accuracy and forming efficiency, and can effectively simplify the existing stator structure. The forming process improves the forming accuracy of the stator structure, and the assembly of the stator teeth and the stator yoke is convenient, which can greatly improve the forming efficiency of the stator structure, reduce the processing cost of the axial magnetic flux permanent magnet motor stator structure, and promote the axial magnetic flux. The application of permanent magnet motor has good promotion and application value.

Description of drawings

1 is a schematic diagram of the overall structure of a yoke-separated stator structure suitable for an axial flux permanent magnet motor in an embodiment of the present invention;

2 is a schematic structural diagram of a stator yoke portion of a toothed yoke separated stator structure suitable for an axial flux permanent magnet motor according to an embodiment of the present invention;

3 is a schematic diagram of a stator tooth structure of a yoke-separated stator structure suitable for an axial magnetic flux permanent magnet motor according to an embodiment of the present invention;

In all the drawings, the same reference numerals denote the same technical features, specifically: 1. stator teeth, 101. torque reducing slots, 102. second projections; 2. stator yokes, 201. yoke projections From, 202. Tooth mounting groove, 203. The first bump.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

In the preferred embodiment of the present invention, the stator structure suitable for the separation of the yoke of the axial flux permanent magnet motor is shown in FIG. 1 , which consists of a stator yoke 2 as shown in FIG. The stator teeth 1 shown are assembled correspondingly, and the assembly of the stator is simple and convenient.

Further, as shown in FIG. 3 , the stator teeth 1 in the preferred embodiment have a wedge-shaped structure with a trapezoidal cross-section, that is, the width of one side is smaller than the width of the other side, and forms a pair of Wedge-shaped side, the angle between the two wedge-shaped sides in the preferred embodiment is preferably 30°, of course, the angle between the two wedge-shaped sides can also be preferably other angles according to actual needs, such as 15°, 20°, 36°, etc.; further Ground, the two wedge-shaped sides corresponding to the two ends of the top and bottom of the stator tooth portion 1 are respectively provided with elongated protruding structures, so that the two parallel sides of the stator tooth portion 1 are generally "I"-shaped, that is, parallel to the two parallel sides. The vertical section of the side is generally in the shape of an "I", as shown in FIG. 3 ; further, the arrangement of the protruding structures on both sides of the bottom of the stator tooth portion 1 makes the two sides of the stator tooth portion 1 respectively formed with second bumps 102 , so as to facilitate the corresponding installation of the stator teeth 1 on the stator yoke 2 .

Further preferably, a torque reducing slot 101 is opened on the top of the stator tooth portion 1. In the preferred embodiment, the opening of the torque reducing slot 101 is aimed at weakening or reducing the cogging torque of the motor, so it is named as "torque reduction". Further, the torque reducing slot 101 in the preferred embodiment is opened at the top center of the stator tooth portion 1 , and the structures on both sides thereof are symmetrical along the axis of the torque reducing slot 101 .

Further, the stator yoke 2 in the preferred embodiment is shown in FIG. 2 , which is preferably obtained by opening a plurality of tooth mounting grooves 202 at intervals on the outer periphery of the yoke body having an annular plate structure, and the openings are spaced apart. After a plurality of tooth mounting grooves 202, a plurality of spaced yoke protrusions 201 are formed on the outer circumference of the yoke body, so that the stator yoke 2 generally has a “gear” structure as shown in FIG. 2; further, In the preferred embodiment, the widths of the yoke portion protrusions 201 along the length direction are equal, that is, the tooth portion mounting slots 202 opened at intervals generally have a “trapezoid” structure, and the width of the tooth portion mounting grooves 202 close to the outer circumference of the stator yoke portion 2 is greater than The width of the side close to the inner circumference of the stator yoke portion 2 is set so as to match the stator tooth portion 1 having a wedge-shaped structure.

Further, in the preferred embodiment, two opposite sidewall surfaces of the tooth mounting groove 202 are respectively provided with protruding structures, namely the first bumps 203, which are preferably set to be elongated structures corresponding to the second bumps 102, so that not only can Fully fit with the second bump 102, increase the contact area, ensure the stability of the stator tooth 1 in the tooth installation slot 202, and the installation form of the long strip structure is simple, which can better ensure the installation accuracy, improve Further, one end face of the first bump 203 is flush with the top face of the stator yoke 2 to ensure the flatness of the end face of the stator yoke 2. Of course, the end faces on both sides of the stator yoke 2 can be used as The top surface of the stator yoke can be converted from the top surface to the bottom surface of the stator yoke 2 by turning the stator yoke 2 over. Therefore, one end face of the first bump 203 only needs to be flush with one side of the stator yoke 2 The end face can meet the requirements, and the distance between the first bump 203 and the end face on the other side of the stator yoke 2 is exactly equal to the thickness of the second bump 102 in the preferred embodiment.

Further, the stator teeth 1 in the preferred embodiment can be correspondingly embedded in the teeth mounting slots 202 of the stator yoke 2. As shown in FIG. 1 , the stator teeth 1 are correspondingly embedded in the teeth on the side with the smaller width. In the installation slot 202, the second bumps 102 on both sides of the bottom of the stator tooth portion 1 respectively contact the bottom and side surfaces of the first bump 203 with the top surface and side surface, that is, the top surface of the second bump 102 abuts the first bump 102. The bottom surface of the bump 203, and the side surface of the second bump 102 abuts the side surface of the first bump 203; The form of interference fit is used for stabilization. In the preferred embodiment, the adhesive may be more preferably glue. Of course, the fixing of the stator teeth 1 in the teeth mounting grooves 202 can also be achieved by other fixing forms in the prior art. , which will not be repeated here; and then through the corresponding assembly and fixing of a plurality of stator teeth 1 on the outer circumference of the stator yoke 2 , the corresponding assembly of the stator structure suitable for the axial flux permanent magnet motor can be realized.

Further preferably, after a plurality of stator teeth 1 are correspondingly installed on the stator yoke 2, a stator slot for accommodating coils is formed between two adjacent stator teeth 1, and two adjacent stator teeth 1 top surfaces are formed. A notch structure with a certain width is formed between the protruding structures on the sides, as shown in FIG. 1 ; further preferably, in the preferred embodiment, the number of stator teeth 1 provided on the stator yoke 2 is 12. Of course, the stator teeth The number of parts 1 can also be preferably set to other numbers according to actual needs. Correspondingly, the size of the stator teeth 1 needs to be corrected accordingly, which can be optimally set according to actual needs, so it is not repeated here.

Further, the stator yoke 2 in the preferred embodiment can be formed by stacking silicon steel sheets of two shapes and sizes in the axial direction. The size difference between the two silicon steel sheets is mainly reflected in the position where the yoke protrusion 201 is formed, and the specific It is reflected in the protrusion width of the silicon steel sheet forming the yoke protrusion 201. Such a difference will cause a first protrusion 203 to be formed on one side of the yoke protrusion 201 after a plurality of silicon steel sheets are stacked in the axial direction, so that the The cross-section of the yoke protrusion 201 has a "T-shaped" structure; further, the stator teeth 1 in the preferred embodiment can preferably be molded by soft magnetic composite material, which is flexible, has high molding accuracy, and can be quickly Structures such as the second bump 102 are formed.

In the present invention, the stator structure suitable for the separation of the tooth yoke of the axial magnetic flux permanent magnet motor is formed by correspondingly setting the "gear-shaped" stator yoke portion 1 and the stator tooth portion 2 that can be correspondingly installed on the outer periphery of the stator yoke portion 1. , on the outer circumference of the stator yoke 1, a plurality of tooth mounting slots 202 that can be used for the installation of the stator teeth 1 are provided at intervals, and the second protrusions 102 and The first bump 203 realizes the fast and accurate positioning and installation of the stator tooth 1 in the tooth installation slot 202 by the abutment of the corresponding end faces of the two bumps, which effectively ensures the installation accuracy of the stator tooth 1 and improves the stator The assembly efficiency of the structure simplifies the preparation process of the stator structure, reduces the processing cost of the stator structure, promotes the popularization and application of the axial flux permanent magnet motor, and has good popularization and application value.

Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, etc., All should be included within the protection scope of the present invention.

Claims (10)

1. A tooth yoke separation stator structure suitable for an axial flux permanent magnet motor is characterized by comprising a stator yoke part (2) and a plurality of stator tooth parts (1) which can be correspondingly assembled on the outer periphery of the stator yoke part (2); wherein,

the stator yoke part (2) is of a 'gear-shaped' structure, a plurality of tooth part mounting grooves (202) are formed in the periphery of the stator yoke part at intervals upwards, a yoke part bulge (201) with a certain width is formed between the two tooth part mounting grooves (202), the notch of each tooth part mounting groove (202) is sequentially reduced from outside to inside, and first protruding blocks (203) which are long-strip-shaped and flush with the end face of the yoke part bulge (201) are arranged on two sides of the yoke part bulge (201) respectively corresponding to the stator tooth parts (1);

the stator tooth part (1) is arranged corresponding to the tooth part mounting groove (202) and is of a wedge-shaped structure with a trapezoidal cross section, second convex blocks (102) are arranged on the bottoms of a pair of wedge-shaped side surfaces forming a certain angle with each other and respectively corresponding to first convex blocks (203) on two sides of the tooth part mounting groove (202), and the second convex blocks (102) can be correspondingly abutted against the bottom surface of the first convex blocks (203) and the side surface of the yoke part bulge (201) by the top surface and the side surfaces after the stator tooth part (1) is correspondingly embedded into the tooth part mounting groove (202) so as to realize the fixation of the stator tooth part (1) in the corresponding tooth part mounting groove (202); then a plurality of stator teeth (1) can be sequentially embedded into the corresponding tooth mounting grooves (202) and fixed, so that a stator structure suitable for the axial flux permanent magnet motor is formed.

2. The tooth-yoke separated stator structure suitable for the axial flux permanent magnet motor according to claim 1, wherein the top of the stator teeth (1) is provided with a torque reduction groove (101) with a certain depth so as to reduce the cogging torque of the motor.

3. The structure of the tooth yoke split stator applicable to the axial flux permanent magnet motor according to claim 2, wherein the moment reducing groove (101) is opened in the center of the top of the stator tooth part (1), and the structures on both sides of the moment reducing groove (101) are symmetrical with the axis of the moment reducing groove (101).

4. The tooth yoke separation stator structure suitable for the axial flux permanent magnet motor according to any one of claims 1 to 3, wherein the tops of the two wedge-shaped side surfaces are respectively provided with a protruding structure which is flush with the top surface of the stator tooth part (1), and the vertical section of the stator tooth part (1) is in an I shape.

5. The tooth-yoke split stator structure suitable for the axial-flux permanent magnet motor according to claim 4, wherein the protruding structures at the tops of two adjacent stator teeth (1) are spaced at a certain distance, and a stator slot capable of accommodating a coil is formed between the two stator teeth (1).

6. The split-tooth stator structure for an axial-flux permanent magnet machine according to any one of claims 1 to 5, wherein the included angle between the two wedge-shaped side surfaces is 30 °.

7. The split-tooth stator structure suitable for the axial-flux permanent magnet motor according to any one of claims 1 to 6, wherein the number of the tooth mounting grooves (202) on the stator yoke portion (2) is 12, and accordingly, the number of the stator teeth (1) is 12.

8. The tooth yoke separation stator structure suitable for the axial flux permanent magnet motor according to any one of claims 1 to 7, wherein the stator teeth (1) and the stator yoke (2) are bonded through an adhesive or are fixed in an interference fit mode.

9. The tooth yoke separation stator structure suitable for the axial flux permanent magnet motor according to any one of claims 1 to 8, wherein the stator yoke portion (2) is formed by laminating silicon steel sheets with two shapes and sizes in the axial direction.

10. The tooth-yoke split stator structure for an axial flux permanent magnet machine according to any of claims 1-9, wherein the stator teeth (1) are molded by soft magnetic composite material.