CN111181261A

CN111181261A - Axial flux motor stator and axial flux permanent magnet synchronous motor

Info

Publication number: CN111181261A
Application number: CN202010131763.5A
Authority: CN
Inventors: 皮志峰; 王建宏; 吴红兵
Original assignee: Hitachi Elevator Motor Guangzhou Co Ltd
Current assignee: Hitachi Elevator Motor Guangzhou Co Ltd
Priority date: 2020-02-29
Filing date: 2020-02-29
Publication date: 2020-05-19

Abstract

The invention relates to an axial flux motor stator and an axial flux permanent magnet synchronous motor. The bottom plate is provided with an axial hole. The stator teeth are multiple and are arranged on the bottom plate at intervals in the circumferential direction around the periphery of the axial hole. The magnetic conduction blocks are correspondingly arranged in the interval between two adjacent stator teeth, and are fixedly connected with the bottom plate and used for enabling the stator teeth to be positioned on the bottom plate. According to the axial flux motor stator, the bottom plate, the stator teeth and the magnetic conduction blocks can be independently produced and manufactured, and then the axial flux motor stator is assembled, so that the production difficulty can be reduced, and the production efficiency can be greatly improved. In addition, special winding equipment is not needed in the product manufacturing, and the manufacturing is convenient and simple. In addition, the requirements on manufacturing equipment and tooling dies are low. The part precision is high, and the structure is reliable.

Description

Axial flux motor stator and axial flux permanent magnet synchronous motor

Technical Field

The invention relates to the technical field of motors, in particular to an axial flux motor stator and an axial flux permanent magnet synchronous motor.

Background

The electric structure of the axial flux permanent magnet synchronous motor realizes the spatial separation of the magnetic field direction and the coil arrangement. The axial flux permanent magnet synchronous motor comprises an axial flux motor stator and a rotor matched with the axial flux motor stator. Conventionally, axial-flux motor stators typically employ cores manufactured using winding techniques. Each specification of the iron core manufactured by the winding technology needs corresponding special tooling for production. In the winding process of the iron core, generally, a method of performing notching and winding at the same time is required. However, the notching and winding process is difficult and the production efficiency is low.

Disclosure of Invention

Based on this, it is necessary to overcome the defects in the prior art, and to provide an axial flux motor stator and an axial flux permanent magnet synchronous motor, which can improve the production efficiency.

The technical scheme is as follows: an axial flux electric machine stator comprising: the bottom plate is provided with an axial hole; stator tooth and magnetic conduction piece, the stator tooth is a plurality of, and is a plurality of the stator tooth is around the peripheral circumference interval of axial hole is located on the bottom plate, magnetic conduction piece is a plurality of, magnetic conduction piece corresponds locates adjacent two in the interval of stator tooth, magnetic conduction piece with the bottom plate is fixed continuous, magnetic conduction piece is used for making the stator tooth is located on the bottom plate.

According to the axial flux motor stator, the bottom plate, the stator teeth and the magnetic conduction blocks can be independently produced and manufactured, and then the axial flux motor stator is assembled, so that the production difficulty can be reduced, and the production efficiency can be greatly improved. In addition, special winding equipment is not needed in the product manufacturing, and the manufacturing is convenient and simple. In addition, the requirements on manufacturing equipment and tooling dies are low. The part precision is high, and the structure is reliable.

In one embodiment, the axial-flux motor stator further includes a plurality of coils, the plurality of coils being disposed in one-to-one correspondence with the plurality of stator teeth; the stator teeth comprise a root part, a winding part and a head part which are connected in sequence; the root is attached to the bottom plate, and the magnetic conduction block is used for enabling the root to be positioned on the bottom plate; the coil is wound on the winding part, a slot is defined by the root part, the winding part and the head part, and the coil is arranged in the slot.

In one embodiment, a positioning groove is formed in the side wall of the root, the magnetic conduction block is provided with a flange corresponding to the positioning groove, and the flange is installed in the positioning groove.

In one embodiment, the two side walls of the magnetic conduction block are provided with flanges, the two side walls of the magnetic conduction block are respectively abutted against the two adjacent roots, and the flanges of the two side walls of the magnetic conduction block are respectively and correspondingly inserted into the positioning grooves of the two adjacent roots.

In one embodiment, the root of one of the stator teeth and the root of the other adjacent stator tooth enclose a dovetail groove, the magnetic conducting blocks are correspondingly dovetail-shaped, and the side walls of the magnetic conducting blocks are abutted against the groove walls of the dovetail groove.

In one embodiment, a first mounting hole is formed in the bottom plate, a second mounting hole corresponding to the first mounting hole is formed in the magnetic conduction block, and the magnetic conduction block passes through the first mounting hole and the second mounting hole through a mounting part and is fixedly mounted on the bottom plate.

In one embodiment, the mounting member is a bolt, and the second mounting hole is a screw hole corresponding to the bolt; the first mounting hole is a counter bore, and the head of the bolt is arranged in the counter bore; the second mounting hole on the magnetic conduction block is more than one.

In one embodiment, the bottom surface of the root of each stator tooth is square, and the projection of the magnetic conduction block on the bottom plate is trapezoidal; or the bottom surface of the root of the stator tooth is trapezoidal, and the projection of the magnetic conduction block on the bottom plate is square.

In one embodiment, the magnetic conducting blocks are obtained by machining, powder metallurgy or casting.

In one embodiment, the stator teeth are connected with each other in an overlapping mode by adopting multiple layers of magnetic conducting material sheets; or the stator teeth are of an integrated structure made of SMC materials.

In one embodiment, the outer wall of the stator teeth is wrapped with a high temperature resistant thermoplastic polymer.

The axial flux permanent magnet synchronous motor comprises an axial flux motor stator and a rotor matched with the axial flux motor stator.

According to the axial flux permanent magnet synchronous motor, the bottom plate, the stator teeth and the magnetic conduction blocks can be independently produced and manufactured, and then the axial flux motor stator is assembled, so that the production difficulty can be reduced, and the production efficiency can be greatly improved. In addition, special winding equipment is not needed in the product manufacturing, and the manufacturing is convenient and simple. In addition, the requirements on manufacturing equipment and tooling dies are low. The part precision is high, and the structure is reliable.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of an axial-flux motor stator according to an embodiment of the present invention;

fig. 2 is a schematic view of an axial-flux motor stator core according to an embodiment of the present invention;

fig. 3 is a schematic view of an axial-flux motor stator core according to an embodiment of the present invention;

fig. 4 is a schematic view of a stator core of an axial-flux electric machine according to an embodiment of the present disclosure;

fig. 5 is a schematic structural view of a coil sleeved on a stator tooth of a stator of an axial-flux motor according to an embodiment of the present invention;

fig. 6 is a schematic structural view illustrating two adjacent stator teeth and magnetic conductive blocks of the stator of the axial-flux motor according to an embodiment of the present invention are fixedly mounted on a base plate;

fig. 7 is a schematic structural view of an axial-flux motor stator according to another embodiment of the present invention, in which two adjacent stator teeth and magnetic conductive blocks are fixedly mounted on a base plate;

FIG. 8 is a schematic view of a stator tooth structure of an axial-flux electric machine stator according to an embodiment of the present disclosure;

fig. 9 is a schematic view of a stator tooth of an axial-flux electric machine stator according to another embodiment of the present disclosure;

fig. 10 is a schematic structural view of a flux guide block of a stator of an axial-flux motor according to an embodiment of the present invention;

fig. 11 is a top view of a flux guide block of a stator of an axial-flux electric machine according to an embodiment of the present invention;

3 fig. 3 12 3 is 3 a 3 cross 3- 3 sectional 3 view 3 at 3 a 3- 3 a 3 of 3 fig. 3 11 3. 3

Reference numerals:

10. a base plate; 11. an axial bore; 12. a first mounting hole; 20. stator teeth; 21. a root portion; 211. positioning a groove; 22. a winding part; 23. a head portion; 24. a wire slot; 25. a sheet of magnetically conductive material; 30. a magnetic conduction block; 31. a flange; 32. a second mounting hole; 40. a coil; 50. a dovetail groove; 60. a mounting member; 61. a head portion.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it should be understood that 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. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

In one embodiment, referring to fig. 1 to 7, an axial flux motor stator includes a base plate 10, stator teeth 20, and magnetic conductive blocks 30. The bottom plate 10 is provided with an axial hole 11. The number of the stator teeth 20 is plural, and the plural stator teeth 20 are circumferentially provided on the bottom plate 10 at intervals around the periphery of the axial hole 11. The number of the magnetic conductive blocks 30 is multiple, the magnetic conductive blocks 30 are correspondingly arranged in the interval between two adjacent stator teeth 20, the magnetic conductive blocks 30 are fixedly connected with the bottom plate 10, and the magnetic conductive blocks 30 are used for positioning the stator teeth 20 on the bottom plate 10.

The bottom plate 10, the stator teeth 20 and the magnetic conduction blocks 30 of the axial flux motor stator can be independently produced and manufactured, and then the axial flux motor stator is assembled, so that the production difficulty can be reduced, and the production efficiency can be greatly improved. In addition, special winding equipment is not needed in the product manufacturing, and the manufacturing is convenient and simple. In addition, the requirements on manufacturing equipment and tooling dies are low. The part precision is high, and the structure is reliable.

Further, referring to fig. 1-7, the axial-flux motor stator further includes a plurality of coils 40. The plurality of coils 40 are provided in one-to-one correspondence with the plurality of stator teeth 20. The stator teeth 20 include a root portion 21, a winding portion 22, and a head portion 23 connected in sequence. The root 21 is attached to the bottom plate 10, and the magnetic conduction block 30 is used for positioning the root 21 on the bottom plate 10. The coil 40 is wound on the winding portion 22, a slot 24 is defined by the root portion 21, the winding portion 22 and the head portion 23, and the coil 40 is disposed in the slot 24. Thus, the slot 24 can limit the coil 40 and prevent the coil 40 from separating from the stator teeth 20. Specifically, the root portion 21, the winding portion 22, and the head portion 23 are integrally configured.

Further, referring to fig. 6 to 9, a positioning groove 211 is disposed on a side wall of the root portion 21, the magnetic conductive block 30 is provided with a flange 31 corresponding to the positioning groove 211, and the flange 31 is installed in the positioning groove 211. In this way, the magnetic block 30 is tightly fixed to the bottom plate 10 by the flange 31 being fitted into the positioning groove 211.

Further, referring to fig. 6 and 8, the two side walls of the magnetic conducting block 30 are provided with flanges 31, the two side walls of the magnetic conducting block 30 are respectively abutted against the two adjacent roots 21, and the flanges 31 of the two side walls of the magnetic conducting block 30 are respectively and correspondingly inserted into the positioning grooves 211 of the two adjacent roots 21. Therefore, the two side walls of the magnetic conduction block 30 are respectively abutted against the two adjacent roots 21, and the flanges 31 of the two side walls of the magnetic conduction block 30 are respectively and correspondingly inserted into the positioning grooves 211 of the two adjacent roots 21, so that the plurality of magnetic conduction blocks 30 can realize that the plurality of stator teeth 20 are stably arranged on the bottom plate 10.

In another embodiment, please refer to fig. 7, wherein the root portion 21 of one of the stator teeth 20 and the root portion 21 of another adjacent stator tooth 20 enclose a dovetail groove 50, the magnetic conductive blocks 30 are correspondingly dovetail-shaped, and the side walls of the magnetic conductive blocks 30 contact the groove walls of the dovetail groove 50. Therefore, the magnetic conduction block 30 stably presses the root 21 of the two adjacent stator teeth 20, and the stator teeth 20 can be stably arranged on the bottom plate 10. Specifically, a first inclined surface is disposed on an outer side wall of one end of the root portion 21 facing the head portion 23, a second inclined surface in interference fit with the first inclined surface is disposed on a side wall of one end of the magnetic conduction block 30 away from the base plate 10, and after the magnetic conduction block 30 is installed in an interval between two adjacent stator teeth 20, the second inclined surface is lapped on the first inclined surface to tightly position the root portion 21 on the base plate 10.

In one embodiment, referring to fig. 6, 10 to 12, a first mounting hole 12 is formed on the bottom plate 10, and a second mounting hole 32 corresponding to the first mounting hole 12 is formed on the magnetic conductive block 30. The magnetic conductive block 30 is fixedly mounted on the base plate 10 by a mounting member 60 passing through the first mounting hole 12 and the second mounting hole 32. Thus, the installation part 60 can be inserted into the first installation hole 12 and the second installation hole 32 to fix the magnetic conductive block 30 on the base plate 10, and the installation operation is convenient.

Further, referring to fig. 6, 10 to 12, the mounting member 60 is a bolt, and the second mounting hole 32 is a screw hole corresponding to the bolt. The first mounting hole 12 is a counterbore in which the head 61 of the bolt is disposed. The number of the second mounting holes 32 on the magnetic conductive block 30 is more than one. Alternatively, the mounting member 60 may be a screw, screw or pin, or the like. Therefore, the axial flux motor stator can be conveniently disassembled and assembled.

Further, referring to fig. 6, 10 to 12, the bottom surface of the root 21 of the stator tooth 20 is square, and the projection of the magnetic conductive block 30 on the bottom plate 10 is trapezoidal. Thus, the two side walls of the magnetic conduction block 30 can be respectively in close contact fit with the side walls of the root portions 21 of the two adjacent stator teeth 20 of the magnetic conduction block 30, so that the magnetic conduction block 30 and the stator teeth 20 can be stably arranged on the bottom plate 10.

In addition, the bottom surface of the root 21 of the stator tooth 20 may also be trapezoidal, and the projection of the magnetic conductive block 30 on the bottom plate 10 is correspondingly square. Similarly, the two sidewalls of the magnetic conductive block 30 can be respectively in close contact with the sidewalls of the root portions 21 of the two adjacent stator teeth 20 of the magnetic conductive block 30, so that the magnetic conductive block 30 and the stator teeth 20 can be stably mounted on the base plate 10.

In other embodiments, the shape of the bottom surface of the root 21 is not limited to a square or a trapezoid, and may be other shapes, which are not limited herein.

Further, the magnetic conductive block 30 is obtained by machining, powder metallurgy or casting.

In one embodiment, referring to fig. 9, the stator teeth 20 are stacked and connected to each other by using a plurality of magnetic conductive material sheets 25. Alternatively, referring to fig. 8, the stator teeth 20 are an integrated structure made of SMC material.

In one embodiment, the outer walls of the stator teeth 20 are wrapped with a high temperature resistant thermoplastic polymer. Specifically, the high temperature resistant thermoplastic polymer is PPA (Polyphthalamide). Thus, the electrical connection between the coil 40 and the stator teeth 20 can be better avoided, and the leakage phenomenon can be avoided.

In one embodiment, referring to fig. 1, an axial flux permanent magnet synchronous motor includes an axial flux motor stator according to any one of the above embodiments, and further includes a rotor engaged with the axial flux motor stator.

According to the axial flux permanent magnet synchronous motor, the bottom plate 10, the stator teeth 20 and the magnetic conduction blocks 30 can be produced and manufactured independently, and then the axial flux motor stator is assembled, so that the production difficulty can be reduced, and the production efficiency can be greatly improved. In addition, special winding equipment is not needed in the product manufacturing, and the manufacturing is convenient and simple. In addition, the requirements on manufacturing equipment and tooling dies are low. The part precision is high, and the structure is reliable.

In one embodiment, referring to fig. 4 to 12, a method for producing an axial flux motor stator includes the following steps:

providing a processed bottom plate 10, a plurality of stator teeth 20 and a plurality of magnetic conduction blocks 30;

the stator teeth 20 are attached to the base plate 10, the magnetic conduction blocks 30 compress the root portions 21 of the stator teeth 20 to the base plate 10, and then the installation parts 60 are adopted to penetrate through the first installation holes 12 of the base plate 10 and the second installation holes 32 of the magnetic conduction blocks 30, so that the magnetic conduction blocks 30 are fixed to the base plate 10. The magnetic conductive blocks 30 are correspondingly arranged in the interval between two adjacent stator teeth 20.

The technical effects of the production method of the axial flux motor stator are the same as those of the axial flux motor stator, and are not described again.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An axial flux motor stator, comprising:

the bottom plate is provided with an axial hole;

stator tooth and magnetic conduction piece, the stator tooth is a plurality of, and is a plurality of the stator tooth is around the peripheral circumference interval of axial hole is located on the bottom plate, magnetic conduction piece is a plurality of, magnetic conduction piece corresponds locates adjacent two in the interval of stator tooth, magnetic conduction piece with the bottom plate is fixed continuous, magnetic conduction piece is used for making the stator tooth is located on the bottom plate.

2. The axial-flux electric machine stator of claim 1, further comprising a plurality of coils disposed in one-to-one correspondence with the plurality of stator teeth; the stator teeth comprise a root part, a winding part and a head part which are connected in sequence; the root is attached to the bottom plate, and the magnetic conduction block is used for enabling the root to be positioned on the bottom plate; the coil is wound on the winding part, a slot is defined by the root part, the winding part and the head part, and the coil is arranged in the slot.

3. The axial-flux motor stator of claim 2, wherein the root portion has a detent groove on a sidewall thereof, and the flux guide block has a flange corresponding to the detent groove, the flange fitting into the detent groove.

4. The axial-flux motor stator according to claim 3, wherein the two side walls of the magnetic conductive block are provided with flanges, the two side walls of the magnetic conductive block respectively abut against the two adjacent roots, and the flanges of the two side walls of the magnetic conductive block respectively and correspondingly insert into the positioning grooves of the two adjacent roots.

5. The axial-flux electric machine stator of claim 2, wherein the root of one of the stator teeth and the root of another adjacent stator tooth define a dovetail slot, the flux-conducting blocks are correspondingly dovetail-shaped, and sidewalls of the flux-conducting blocks abut walls of the dovetail slot.

6. The axial-flux motor stator according to claim 1, wherein the base plate has a first mounting hole, the flux guide block has a second mounting hole corresponding to the first mounting hole, and the flux guide block is fixedly mounted on the base plate by a mounting member passing through the first mounting hole and the second mounting hole.

7. The axial-flux electric machine stator of claim 6, wherein the mounting member is a bolt, and the second mounting hole is a screw hole corresponding to the bolt; the first mounting hole is a counter bore, and the head of the bolt is arranged in the counter bore; the second mounting hole on the magnetic conduction block is more than one.

8. The axial-flux motor stator of claim 1, wherein a bottom surface of a root of the stator tooth is square, and a projection of the flux guide block on the bottom plate is trapezoidal; or the bottom surface of the root of the stator tooth is trapezoidal, and the projection of the magnetic conduction block on the bottom plate is square.

9. The axial-flux electric machine stator of claim 1, wherein the flux-conducting blocks are machined, powder-metallurgically formed, or cast.

10. The axial-flux electric machine stator of any one of claims 1-9, wherein the stator teeth are connected to each other in a stacked arrangement using multiple layers of sheets of magnetic conductive material; or the stator teeth are of an integrated structure made of SMC materials.

11. The axial-flux electric machine stator of claim 10, wherein an outer wall of the stator teeth is wrapped with a high-temperature resistant thermoplastic polymer.

12. An axial flux permanent magnet synchronous machine comprising an axial flux machine stator according to any of claims 1 to 11, and a rotor cooperating with the axial flux machine stator.