Disc type permanent magnet motor and rotor structure thereof

Abstract

The utility model provides a disc type permanent magnet motor and a rotor structure thereof. The rotor structure of the disc type permanent magnet motor is divided into a plurality of magnetic pole units along the circumferential direction of the rotor structure, each magnetic pole unit comprises at least one magnetic steel sheet, and each magnetic steel sheet is formed by splicing a plurality of magnetic steel blocks. The small-size magnetic steel blocks are low in processing difficulty, so that the large-size magnetic steel sheet is formed by splicing the plurality of magnetic steel blocks, and the processing difficulty of the magnetic steel sheet can be reduced; the shape and the size of the magnetic steel sheets can be flexibly adjusted by adjusting the number and the area of the magnetic steel blocks, convenience is provided for adjusting the magnetic flux of the motor, the flexibility of improving the performance of the motor is improved, and the difficulty of improving the performance of the motor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a disc-type permanent magnet motor and a rotor structure thereof. Background Art

[0002] A motor is a rotating electrical machine that converts electrical energy into mechanical energy. Permanent magnet synchronous motors use permanent magnets for excitation, simplifying their structure and reducing machining and assembly costs. Furthermore, since no excitation current is required, there are no excitation losses, which improves the motor's efficiency and power density.

[0003] A disc-type permanent magnet motor, also known as an axial flux permanent magnet machine (AFPMM), typically features a disc-shaped stator and rotor, symmetrically positioned within the motor, generating an axial air-gap magnetic field. Due to its flat structure, disc-type permanent magnet motors are well-suited for applications requiring high torque density and compact space, such as electric vehicles, renewable energy systems, flywheel energy storage systems, and industrial equipment.

[0004] Figures 1 to 4 FIG. 1 shows a schematic diagram of a magnetic steel sheet of a disc-type permanent magnet motor rotor structure in the prior art. Figures 1 to 4 As shown, the rotor structure 100' includes a plurality of magnetic steel sheets 1' distributed along its circumference. The shape of the magnetic steel sheet 1' can be an annular sector, a rectangle, an oblique-edge annular sector, a parallelogram, etc. Each magnetic steel sheet in the current disc motor rotor is a monolithic structure. The advantage of the monolithic structure is its simple structure, but the problems are: (1) the magnetic steel sheet is large in size and is easily broken during assembly; (2) if the monolithic structure is made into an oblique pole solution (such as Figure 3 and Figure 4 (as shown), the process is difficult and the consistency varies greatly; (3) The integrated solution is also difficult to control the magnetic flux, so it is generally achieved by changing the magnetic steel material or the overall shape (that is, changing the size of the area of ​​the magnetizing direction of the magnetic steel) to finally achieve the purpose of changing the single-pole magnetic flux. The implementation of this solution is equivalent to redesigning the motor, and the change cycle is long and difficult. Utility Model Content

[0005] In view of the problems in the prior art, the purpose of the present invention is to provide a disc-type permanent magnet motor and a rotor structure thereof, which can reduce the difficulty of processing magnetic steel sheets and improve the flexibility of the improved rotor structure.

[0006] An embodiment of the present invention provides a rotor structure of a disc motor, wherein the rotor structure is divided into a plurality of magnetic pole units along its circumference, each of the magnetic pole units includes at least one magnetic steel sheet, and each of the magnetic steel sheets is formed by splicing a plurality of magnetic steel blocks.

[0007] In some embodiments, the magnetic steel blocks in each magnetic steel sheet have the same area and shape.

[0008] In some embodiments, at least some of the magnetic steel blocks in each of the magnetic steel sheets have different areas or shapes.

[0009] In some embodiments, the magnetic steel block is square, rectangular or trapezoidal.

[0010] In some embodiments, a rotor bracket is further included, wherein the rotor bracket is provided with a mounting slot, and each of the magnetic steel sheets is placed in the mounting slot.

[0011] In some embodiments, each of the magnetic steel sheets is arranged with oblique poles.

[0012] In some embodiments, the magnetic steel sheets are evenly distributed along the circumference of the rotor.

[0013] An embodiment of the present invention also provides a disc-type permanent magnet motor, comprising the rotor structure, stator structure and rotor shaft as described above, wherein the stator structure is mounted on the rotor shaft and is rotationally connected to the rotor shaft; the rotor structure is mounted on the rotor shaft and is fixedly connected to the rotor shaft.

[0014] In some embodiments, the rotor structure and the stator are included in plurality, and the rotor structure and the stator structure are alternately arranged in sequence along the axial direction of the rotor shaft.

[0015] In some embodiments, two rotor structures are included, both of which are mounted on the rotor shaft and fixedly connected to the rotor shaft. The two rotor structures are located on both sides of the stator structure along the axial direction of the rotor shaft.

[0016] The disc-type permanent magnet synchronous motor and its rotor structure provided by the utility model have the following advantages:

[0017] Small-sized magnetic steel blocks are easy to process, and multiple magnetic steel blocks are spliced ​​together to form a magnetic steel sheet, which reduces the difficulty of processing the magnetic steel sheet. The size and area of ​​the magnetic steel blocks are flexible and variable, and magnetic steel blocks can be spliced ​​together to form magnetic steel sheets of various shapes to improve the magnetic flux of the magnetic steel sheet. Therefore, the spliced ​​magnetic steel sheets can increase the flexibility of improving the motor performance and reduce the difficulty of improving the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.

[0019] Figure 1 It is a schematic diagram of a magnetic steel sheet of a disc-type permanent magnet motor rotor structure in the prior art;

[0020] Figure 2 Schematic diagram of another magnetic steel sheet of a disc-type permanent magnet motor rotor structure in the prior art;

[0021] Figure 3 Schematic diagram of another magnetic steel sheet of a disc-type permanent magnet motor rotor structure in the prior art;

[0022] Figure 4 Schematic diagram of another magnetic steel sheet of a disc-type permanent magnet motor rotor structure in the prior art;

[0023] Figure 5 This is a schematic diagram of the magnetic steel sheets of the disc-type permanent magnet motor rotor structure according to one embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of a magnetic steel sheet of a disc-type permanent magnet motor rotor structure according to another embodiment of the present invention;

[0025] Figure 7 A schematic diagram showing a mounting slot of a rotor support according to an embodiment of the present invention is shown;

[0026] Figure 8 A schematic diagram of a disc-type permanent magnet motor according to an embodiment of the present invention is shown.

[0027] Reference numerals:

[0028] 1' Magnetic steel sheet in the prior art

[0029] 100' Rotor structure in the prior art

[0030] 100 Rotor Structure

[0031] 10 magnetic steel sheets

[0032] 20 magnetic steel blocks

[0033] 30 mounting slots

[0034] 200 stator structure

[0035] 300 rotor shaft DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many 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 and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the drawings represent identical or similar structures, and thus repeated description thereof will be omitted.

[0037] In the description of this application, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this application, as well as features of different embodiments or examples, unless otherwise contradictory.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include at least one such feature. In the context of this application, "plurality" means two or more, unless otherwise specifically defined.

[0039] It should be further understood that the terms "comprise" and "include" indicate the presence of features, steps, operations, elements, components, items, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition occur only when a combination of elements, functions, steps, or operations are inherently mutually exclusive in some way.

[0040] In order to solve the problems in the prior art, an embodiment of the present invention provides a disc-type permanent magnet motor and its rotor structure. The rotor structure is divided into a plurality of magnetic pole units along its circumference, each of the magnetic pole units includes at least one magnetic steel sheet, and each of the magnetic steel sheets is formed by splicing a plurality of magnetic steel blocks. Small-sized magnetic steel blocks are easy to process, so by splicing a plurality of magnetic steel blocks to form a large-sized magnetic steel sheet, the processing difficulty of the magnetic steel sheet can be reduced; by splicing the magnetic steel blocks, the shape and area of ​​the magnetic steel sheet can be flexibly adjusted, which facilitates the adjustment of the magnetic flux of the motor. Therefore, the spliced ​​magnetic steel sheets can increase the flexibility of improving the motor performance and reduce the difficulty of improving the motor performance.

[0041] Figure 5 This is a schematic diagram of the magnetic steel sheets of the disc-type permanent magnet motor rotor structure provided by one embodiment of the present invention; Figure 6 This is a schematic diagram of a magnetic steel sheet of a disc-type permanent magnet motor rotor structure provided by another embodiment of the present invention; Figure 7Schematic diagram of the mounting slot of the rotor bracket provided in one embodiment of the present utility model; Figure 8 It is a schematic diagram of a disc-type permanent magnet motor provided in one embodiment of the present utility model.

[0042] Please refer to Figure 5 and Figure 6 The rotor of the disc permanent magnet motor is divided into a plurality of magnetic pole units along its circumference. Each magnetic pole unit includes at least one magnetic steel sheet 10. Each magnetic steel sheet 10 is formed by splicing a plurality of magnetic steel blocks 20.

[0043] The magnetic steel block 20 is made of a permanent magnet material. Common permanent magnet materials include Alnico, FeCrCo, ferrite, rare earth, and composite permanent magnets. Large permanent magnets are difficult to process, while small permanent magnets are relatively easy to process. Therefore, by splicing small magnetic steel blocks 20 together to form a large magnetic steel sheet 10, the processing difficulty of the magnetic steel sheet 10 can be reduced.

[0044] In some embodiments, the areas and shapes of the magnetic steel blocks 20 in each magnetic steel sheet 10 are the same. Figure 5 As shown, in one embodiment, the rotor structure 100 includes 6 magnetic steel sheets 10. Each magnetic steel sheet 10 is formed by splicing 22 magnetic steel blocks 20. The magnetic steel blocks 20 in the rotor structure 100 are square and have equal areas.

[0045] Figure 6 As shown, in another embodiment, the rotor structure 100 includes 14 magnetic steel sheets 10, each magnetic steel sheet 10 being formed by splicing three magnetic steel blocks 20. Each magnetic steel block 20 in the rotor structure 100 is rectangular and has equal area. However, the shape of the magnetic steel block 20 is not limited to the above example and may also be a trapezoidal shape, etc. Those skilled in the art can determine the specific shape of the magnetic steel block 20 according to actual needs.

[0046] In other embodiments, at least some of the magnetic steel blocks 20 in each magnetic steel sheet 10 may have different areas or shapes. The specific shape of each magnetic steel block 20 may be set according to actual needs and is not limited here.

[0047] Figure 5 The shape of the magnetic steel sheet 10 is Figure 6 The shapes of the magnetic steel sheets 10 in the magnets 10 are different. Those skilled in the art can flexibly adjust the shapes of the magnetic steel sheets 10 according to the magnetic steel blocks 20. The magnetic flux of the permanent magnet is related to its shape. Those skilled in the art can also adjust the magnetic flux of the permanent magnet accordingly by increasing the number of magnetic steel blocks 20 in each magnetic steel sheet 10 according to the required motor performance, thereby increasing the flexibility of improving motor performance and reducing the difficulty of adjusting motor performance.

[0048] The manufacturing process of a permanent magnet is as follows: the raw materials required for preparing the permanent magnet (such as iron, cobalt, nickel, aluminum, etc.) are selected and mixed in a certain proportion; the permanent magnet blank is then processed through a powder metallurgy process; after the blank is sintered, it is subjected to multiple processes such as grinding, processing, and polishing to achieve the desired shape and size; the processed blank is placed in a strong magnetic field generated by an electromagnet for magnetization and magnetization to obtain the required permanent magnet. In a permanent magnet motor, the magnetization direction of the permanent magnet is crucial to its performance and application. The magnetization direction determines the direction of the magnetic field generated by the permanent magnet, which in turn affects the working efficiency and performance of the motor. The area of ​​the magnetization direction, that is, the size of the area where the magnetic field acts, affects the effective area of ​​the permanent magnet, that is, the size of the area that can generate magnetic force. In the embodiment of the present invention, the area of ​​the magnetization direction can also be changed to change the magnetic flux of the permanent magnet, thereby achieving a diversified design of the motor performance.

[0049] In some embodiments, each magnetic steel sheet 10 is arranged with a skewed pole, that is, the extension direction of the magnetic steel sheet 10 is arranged at an angle to the radial direction of the rotor structure 100. The skewed pole arrangement helps reduce motor torque pulsation and back electromotive force harmonics, improve noise and vibration, and achieve optimal electromagnetic performance of the motor. The skewed pole arrangement of the magnetic steel sheet 10 can be linearly skewed or segmented, etc., and is not specifically limited here. The rotor structure provided in the embodiments of the present invention can be spliced ​​with magnetic steel blocks to form a variety of skew angles. Those skilled in the art can set the specific skew angle according to actual needs.

[0050] Specifically, in some embodiments, the magnetic steel sheets 10 are evenly distributed along the circumference of the rotor structure. Figure 5 and Figure 6 As shown, the rotor structure 100 is evenly divided into a plurality of magnetic pole units along its circumference, so that the magnetic field of the rotor structure 100 is evenly distributed, thereby enhancing the uniformity of the rotor magnetic field intensity distribution.

[0051] Specifically, in some embodiments, the rotor structure 100 further includes a rotor bracket (not shown in the figure), which is provided with mounting grooves along its circumference, and each magnetic steel sheet 10 is correspondingly arranged in a mounting groove. The shape of the mounting groove can be the same as or different from the shape of the magnetic steel sheet 10. Figure 5 and Figure 6 The magnetic steel sheet 10 on the rotor support may be provided with a mounting groove of the same shape as the magnetic steel sheet 10. In another embodiment, a mounting groove of a different shape from the magnetic steel sheet 10 may be provided on the rotor support. For example, Figure 7As shown, the mounting slot 30 is annular and fan-shaped. A magnetic steel sheet 10 formed by multiple magnetic steel blocks 20 is positioned within the annular and fan-shaped mounting slot 30. Because the magnetic steel blocks 20 within the mounting slot 30 do not completely fill the entire space, a non-magnetic material is provided within the mounting slot 30 to secure the magnetic steel blocks 20. For example, the non-magnetic material is adhesive. After the magnetic steel blocks 20 are mounted on the rotor bracket, adhesive can be added to fill the gaps between the magnetic steel blocks 20 to enhance bonding strength and improve structural reliability.

[0052] In one possible implementation, the rotor support is a non-magnetic support, which can reduce magnetic leakage and magnetic flux loss.

[0053] like Figure 8 As shown, an embodiment of the present invention further provides a disc-type permanent magnet motor, comprising a stator structure 200, the rotor structure 100 described above, and a rotor shaft 300. The stator structure 200 is mounted on and rotatably connected to the rotor shaft 300; the rotor structure 100 is mounted on and fixedly connected to the rotor shaft 300. The disc-type permanent magnet motor can achieve the technical effects of the rotor structure 100, and will not be described in detail here.

[0054] In one embodiment, the stator structure 200 can be a centralized winding stator or a distributed winding stator. A centralized winding stator includes multiple stator cores distributed around the rotor axis, with windings wound around each stator core to form a centralized winding. A distributed winding stator includes a stator core that is integrally arranged around the rotor axis. Winding slots are stamped into the stator core, and windings are wound into these slots to form a distributed winding.

[0055] When alternating current is passed through the armature windings of the stator structure 200, the generated alternating magnetic flux interacts with the permanent magnetic flux generated by the rotor structure 100, causing the rotor structure 100 to rotate relative to the stator structure 200. The rotor structure 100 is fixedly connected to the rotor shaft 300, causing the rotor shaft 300 to rotate along the rotor structure 100. The stator structure 200 is rotationally connected to the rotor shaft 300, causing the rotor shaft 300 to rotate relative to the stator structure 200.

[0056] An air gap Q is provided between the stator structure 200 and the rotor structure 100 , and magnetic lines of force generated in the rotor structure 100 can enter the stator structure 200 through the air gap Q.

[0057] In this embodiment, the disc-type permanent magnet motor includes a rotor structure 100 and a stator structure 200 .

[0058] In other embodiments, the disc-type permanent magnet motor includes multiple rotor structures 100 and stator structures 200, which are alternately arranged along the axial direction of the rotor shaft 300. For example, the disc-type permanent magnet motor includes three rotor structures 100 and two stator structures 200.

[0059] In other embodiments, the disc-type permanent magnet motor includes two rotor structures 100, both mounted on and fixedly connected to the rotor shaft 300. The two rotor structures 100 are arranged on both sides of the stator structure 200 along the axial direction of the rotor shaft 300. The two rotor structures 100 can improve the operating efficiency of the axial motor.

[0060] In summary, the disc-type permanent magnet motor and its rotor structure provided by the present invention have the following advantages:

[0061] Small-sized magnetic steel blocks are easy to process, and by splicing the magnetic steel blocks into large-sized magnetic steel sheets, the processing difficulty of the magnetic steel sheets can be reduced; the magnetic steel blocks can be spliced ​​into magnetic steel sheets of various shapes, and the shape and size of the magnetic steel sheets can be flexibly adjusted, which provides convenience for adjusting the shape of the magnetic steel sheets and adjusting the magnetic flux of the motor, increases the flexibility of improving the motor performance, reduces the difficulty of improving the motor performance, and improves the motor performance.

[0062] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A rotor structure of a disc-type permanent magnet motor, characterized in that: The rotor structure is divided into a plurality of magnetic pole units along its circumferential direction. Each of the magnetic pole units includes at least one magnetic steel sheet. Each of the magnetic steel sheets is formed by splicing a plurality of magnetic steel blocks.

2. The rotor structure according to claim 1, characterized in that: The magnetic steel blocks in each magnetic steel sheet have the same area and shape.

3. The rotor structure according to claim 1, characterized in that: At least some of the magnetic steel blocks in each of the magnetic steel sheets have different areas or shapes.

4. The rotor structure according to claim 1, characterized in that: The magnetic steel block is square, rectangular or trapezoidal.

5. The rotor structure according to claim 1, characterized in that: It also includes a rotor bracket, which is provided with a mounting groove, and each of the magnetic steel sheets is placed in the mounting groove.

6. The rotor structure according to claim 1, characterized in that: Each of the magnetic steel sheets is arranged with oblique poles.

7. The rotor structure according to claim 1, characterized in that: The magnetic steel sheets are evenly distributed along the circumference of the rotor.

8. A disc-type permanent magnet motor, characterized in that: It comprises the rotor structure, stator structure and rotor shaft according to any one of claims 1 to 7, wherein the stator structure is mounted on the rotor shaft and is rotationally connected to the rotor shaft; the rotor structure is mounted on the rotor shaft and is fixedly connected to the rotor shaft.

9. The disc-type permanent magnet motor according to claim 8, characterized in that: It comprises a plurality of rotor structures and stator structures, and the rotor structures and the stator structures are alternately arranged in sequence along the axial direction of the rotor shaft.

10. The disc-type permanent magnet motor according to claim 9, characterized in that: The two rotor structures are both mounted on the rotor shaft and fixedly connected to the rotor shaft. The two rotor structures are located on both sides of the stator structure along the axial direction of the rotor shaft.

Images