Separated permanent magnet motor rotor structure and assembling method thereof

Abstract

The invention discloses a separated permanent magnet motor rotor structure and an assembly method thereof, the separated permanent magnet motor rotor structure comprises a rotor body, the rotor body is provided with an axial through groove, the through groove comprises magnetic steel grooves and an installation groove, a non-magnetic connection column is installed in the installation groove, the magnetic steel grooves are located at two sides of the connection column, and the magnetic steel grooves are located at two sides of the connection column. The through grooves can be formed at a time when the rotor punching sheet is stamped, then the non-magnetic-conductive connecting columns are installed in the installation grooves of the through grooves, the magnetic conduction of the rotor punching sheet is isolated by means of the connecting columns, the magnetic leakage phenomenon between the magnetic steel is effectively reduced, and then the motor performance is improved. The integral structural strength of the rotor structure can be effectively improved through the arrangement of the connecting columns, in addition, due to the design of the through grooves, an area with a thin middle magnetic bridge does not exist when the rotor punching sheet is punched, the production process difficulty is effectively reduced, meanwhile, the rejection rate is reduced, and the integral assembly mode is simple and convenient.

Description

Technical Field

[0001] The invention relates to the field of motor rotors, and in particular to a separated permanent magnet motor rotor structure and an assembly method thereof. Background Art

[0002] For permanent magnet synchronous motors, especially high-speed permanent magnet synchronous motors, how to fix the magnets to prevent them from flying out, how to design a safety structure to overcome the centrifugal force, and how to reduce the loss of magnetic properties are key points that need to be paid attention to, and are also details that give engineers a headache.

[0003] The current high-speed permanent magnet synchronous motor basically adopts an embedded structure. In order to increase the magnetic field, a "V" structure is often used, such as Figure 1 As shown in the figure, the existing rotor punching structure, the "V" structure must ensure that the rotor punching structure can withstand the centrifugal force at high speed after being assembled into the magnetic steel, and the outer and middle magnetic bridges cannot be too thick, resulting in magnetic performance loss. Since the outer and middle magnetic bridges are usually very thin, this structure has high processability requirements and mold requirements, and there are high production difficulties and a high scrap rate in actual production, which needs to be further improved. Summary of the invention

[0004] In order to further enhance the strength of the rotor structure and reduce the difficulty of production, the present application provides a separate permanent magnet motor rotor structure and an assembly method thereof.

[0005] The present application provides a separated permanent magnet motor rotor structure, which adopts the following technical solution: A separate permanent magnet motor rotor structure comprises a rotor body, wherein the rotor body is provided with an axial through slot, wherein the through slot comprises a magnetic steel slot and a mounting slot, wherein a non-magnetic connecting column is mounted in the mounting slot, and the magnetic steel slot is located on both sides of the connecting column.

[0006] Optionally, a plurality of the through slots and connecting columns are distributed around the circumference, a center hole is opened at the center of the rotor body, a connecting ring is installed at the center hole, and the connecting ring connects the connecting columns.

[0007] Optionally, the mounting groove is connected to the magnetic steel grooves on both sides.

[0008] Optionally, the end of the connecting column has an outwardly protruding clamping portion, and the connecting ring has a clamping groove adapted to the clamping portion.

[0009] Optionally, a pressing portion for pressing the magnetic steel is protruding from the side wall of the connecting column, and the pressing portion presses the side of the magnetic steel away from the center of the circle.

[0010] Optionally, the pressing portion is triangular and includes a pressing inclined surface, and the pressing inclined surface abuts against the magnetic steel.

[0011] Optionally, the connecting posts are arranged along the radial direction of the rotor body, and 6 connecting posts are evenly distributed around the circumference.

[0012] Optionally, the connecting column is insulated and is made of aluminum or stainless steel.

[0013] The present application also provides an assembly method for a separate permanent magnet motor rotor structure, which adopts the following technical solution: A method for assembling a separate permanent magnet motor rotor structure, characterized in that it includes the following steps: S1, stacking rotor sheets to form a rotor body, keeping the slots on the rotor sheets aligned; S2, inserting non-magnetic connecting columns into each installation slot of the through slot; S3, installing a connecting ring at the center hole of the rotor body; S4, inserting magnetic steel into the magnetic steel slot of the rotor body.

[0014] Optionally, the rotor punching sheets are stacked and pressed, and the end surface of the rotor body is flush with the end surfaces of the connecting column and the connecting ring.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. The slot can be formed at one time when the rotor sheet is stamped, and then the non-magnetic connecting column is installed in the installation slot of the slot, and the magnetic conductivity of the rotor sheet is isolated by the connecting column, which effectively reduces the magnetic leakage between the magnetic steels, thereby improving the motor performance. The setting of the connecting column can effectively improve the overall structural strength of the rotor structure. In addition, this slot design will not have a very thin area in the middle of the rotor sheet when stamping, which effectively reduces the difficulty of the production process and reduces the scrap rate; 2. The connecting column can also play the role of axially fixing the rotor punching, thus eliminating the traditional riveting structure and buckle structure, making the structure of the rotor punching more simplified and further reducing the difficulty of manufacturing the rotor punching; 3. The connection column is insulated to effectively isolate the connection column and the rotor punching from conducting electricity, thereby reducing iron loss, thus effectively preventing the demagnetization of the magnetic steel and the weakening of the magnetic properties, and ultimately improving the performance of the motor rotor; 4. The design of the connecting ring can connect the connecting columns into a whole, further improving the structural strength of the rotor. The inner hole of the connecting ring can be used to connect the core shaft of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of a rotor punching sheet in the prior art.

[0017] Figure 2 It is a structural diagram of the rotor punching in the embodiment of the present application.

[0018] Figure 3 This is a structural diagram of the embodiment of the present application after the connecting column is installed.

[0019] Figure 4 It is a structural diagram of the embodiment of the present application after being installed in the connecting ring.

[0020] Figure 5 This is a structural diagram of the embodiment of the present application after the magnetic steel is installed.

[0021] Figure 6 It is an installation flow chart of an embodiment of the present application.

[0022] Description of reference numerals: 1. External magnetic bridge; 2. Intermediate magnetic bridge; 3. Rotor body; 4. Through slot; 5. Mounting slot; 6. Magnetic steel slot; 7. Magnetic steel; 8. Connecting column; 9. Center hole; 10. Connecting ring; 11. Inner hole; 12. Snap-fit ​​part; 13. Snap-fit ​​slot; 14. Pressing part; 15. Pressing inclined surface. DETAILED DESCRIPTION

[0023] The following is combined with Figure 2-6 This application is described in further detail.

[0024] A separate permanent magnet motor rotor structure, such as Figure 2-Figure 4 As shown, it includes a rotor body 3, which is formed by stacking rotor punchings. An axial through slot 4 is opened on the rotor body 3, and the axial ends of the through slot 4 pass through. There are multiple through slots 4 evenly distributed around the circumference of the rotor body 3. In this embodiment, 6 through slots 4 are provided, and the through slots 4 include mutually connected mounting slots 5 and magnetic steel slots 6. The mounting slots 5 are arranged along the radial direction of the rotor body 3, and the magnetic steel slots 6 are symmetrically arranged on both sides of the mounting slots 5. The magnetic steel slots 6 are used to insert magnetic steels 7. A connecting column 8 adapted to the mounting slot 5 is installed in the mounting slot 5. The connecting column 8 is made of non-magnetic conductive material, specifically aluminum or stainless steel. In this embodiment, the connecting column 8 is made of stainless steel, so that the connecting column 8 has higher structural strength. The connecting column 8 is arranged one by one with the through slot 4. The length direction of the connecting column 8 extends along the axial direction of the rotor body 3, and the length of the connecting column 8 is consistent with the axial length of the rotor body 3, that is, the structure of the connecting column 8 is in the form of a lath.

[0025] Then, by installing the non-magnetic connecting column 8 into the mounting slot 5 of the slot 4, the connecting column 8 is used to isolate the magnetic conductivity of the rotor punching sheet, effectively reducing the magnetic leakage phenomenon between the magnetic steels 7, thereby improving the motor performance; the connecting column 8 itself is made of metal stainless steel with good structural strength, thereby effectively improving the overall structural strength of the rotor structure. In addition, the design of the slot 4 will not have an area with a very thin intermediate magnetic bridge 2 when the rotor punching sheet is stamped, avoiding the design of a thin intermediate magnetic bridge 2 in the traditional design, reducing the precision requirements for the stamping die, effectively reducing the difficulty of the production process, and the rotor punching sheet is not easy to be scrapped during the stamping process, which greatly reduces the scrap rate.

[0026] like Figure 2 and Figure 3 As shown, the mounting slot 5 is connected with the magnetic steel slot 6 to form a complete through slot 4, that is, the through slot 4 is directly formed during the stamping process of the rotor punching sheet, and the magnetic steel slots 6 are magnetically isolated by the connecting column 8 installed later in the mounting slot 5, which effectively simplifies the stamping process of the rotor punching sheet and reduces the difficulty of manufacturing the rotor punching sheet.

[0027] like Figure 3 and Figure 4 As shown, a center hole 9 is opened in the center of the rotor body 3, and a connecting ring 10 adapted thereto is installed at the center hole 9. The outer periphery of the connecting ring 10 is connected to the ends of each connecting column 8 in the circumferential direction, and the ends of the connecting column 8 are radially linked and snap-connected with the outer periphery of the connecting ring 10. The design of the connecting ring 10 can connect the connecting columns 8 into a whole, further improving the structural strength of the rotor. The inner hole 11 of the connecting ring 10 can be used to connect the core shaft of the rotor.

[0028] like Figure 3 and Figure 4 As shown, both end portions of the connecting column 8 are provided with an outwardly protruding clamping portion 12, and the cross-section of the clamping portion 12 is T-shaped. At the same time, a clamping groove 13 adapted to the clamping portion 12 is opened on the outer periphery of the connecting ring 10. By means of the clamping of the clamping portion 12 and the clamping groove 13, the radial direction linkage limiting can be effectively realized. One end of the connecting column 8 is clamped with the rotor body 3, and the other end is clamped with the connecting ring 10, thereby improving the installation firmness of the connecting column 8 and realizing the integrity of the rotor structure.

[0029] like Figure 4 and Figure 5As shown, a protruding pressing portion 14 is provided in the middle of the connecting column 8, and the pressing portion 14 is used to press the side wall of the magnetic steel 7 in the magnetic steel slot 6. With the help of the pressing portion 14, the magnetic steel 7 can be effectively supported. During the rotation of the rotor, the pressing portion 14 and the rotor body 3 can jointly support the magnetic steel 7 to achieve a better supporting effect; the pressing portion 14 is arranged one by one with the magnetic steel 7. In this embodiment, the cross-section of the pressing portion 14 is triangular and includes a pressing inclined surface 15, which abuts against the side wall of the magnetic steel 7. In addition, the design of the protruding pressing portion 14 can further improve the stability of the connection between the connecting column 8 and the rotor body 3.

[0030] like Figure 4 and Figure 5 As shown, in this embodiment, the connecting column 8 is insulated, and the insulation treatment method may be surface spraying of insulating paint or surface blackening treatment or surface electrophoresis treatment, etc. The connecting column 8 is insulated, which can effectively isolate the conductive connection column 8 and the rotor punching sheet, thereby reducing the iron loss phenomenon, thereby effectively preventing the demagnetization of the magnetic steel 7 and the weakening of the magnetic property, and ultimately improving the performance of the motor rotor.

[0031] A method for assembling a separate permanent magnet motor rotor structure mainly comprises the following steps: S1, preparation before assembly, stacking the rotor punchings to form the rotor body 3, keeping the positions of the through slots 4 of each rotor punching corresponding and overlapping, and stacking the rotor punchings to form the rotor body 3; S2, each non-magnetic connecting column 8 is installed into the installation groove 5 of each through groove 4 in the axial direction, see Figure 3 ; S3, install the connecting ring 10 at the central hole 9 of the rotor body 3, and the clamping groove 13 on the connecting ring 10 is clamped with the clamping part 12 on the connecting column 8, see Figure 4 ; S4, insert the corresponding magnetic steel 7 into the magnetic steel slot 6 of the rotor body 3, and make the magnetic steel 7, the connecting column 8 and the end surface of the rotor body 3 flush, so as to obtain the finished rotor core, see Figure 5 .

[0032] In other embodiments, a certain amount of reserve can be reserved on the periphery when stamping the rotor sheets, so that the outer magnetic bridge 1 will not be too thin during the punching process, which can also reduce the difficulty of the punching process and the scrap rate, making the production of rotor sheets easier. The reserve on the periphery can be cut off by turning after the rotor core is completed, further solving the problem of high scrap rate of rotor sheets during the production process.

[0033] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A split permanent magnet motor rotor structure, characterized in that: The invention comprises a rotor body (3), wherein an axial through slot (4) is provided on the rotor body (3), wherein the through slot (4) comprises a magnetic steel slot (6) and a mounting slot (5), wherein a non-magnetic connecting column (8) is mounted in the mounting slot (5), and wherein the magnetic steel slot (6) is located on both sides of the connecting column (8).

2. A separate permanent magnet motor rotor structure according to claim 1, characterized in that: A plurality of the through slots (4) and the connecting columns (8) are distributed around the circumference. A center hole (9) is opened at the center of the rotor body (3). A connecting ring (10) is installed at the center hole (9). The connecting ring (10) connects the connecting columns (8).

3. The separated permanent magnet motor rotor structure according to claim 1, characterized in that: The installation groove (5) is connected to the magnetic steel grooves (6) on both sides.

4. The separated permanent magnet motor rotor structure according to claim 2, characterized in that: The end of the connecting column (8) has an outwardly protruding clamping portion (12), and the connecting ring (10) has a clamping groove (13) adapted to the clamping portion (12).

5. A separate permanent magnet motor rotor structure according to claim 1 or 4, characterized in that: A pressing portion (14) for pressing the magnetic steel (7) is convexly provided on the side wall of the connecting column (8), and the pressing portion (14) presses the side of the magnetic steel (7) away from the center of the circle.

6. A separate permanent magnet motor rotor structure according to claim 5, characterized in that: The pressing portion (14) is triangular and comprises a pressing inclined surface (15), and the pressing inclined surface (15) abuts against the magnetic steel (7).

7. The separated permanent magnet motor rotor structure according to claim 2, characterized in that: The connecting columns (8) are arranged along the radial direction of the rotor body (3), and six connecting columns (8) are evenly distributed around the circumference.

8. The separated permanent magnet motor rotor structure according to claim 1, characterized in that: The connecting column (8) is insulated and is made of an aluminum column or a stainless steel column.

9. A method for assembling a separate permanent magnet motor rotor structure, characterized in that: The following steps are involved: S1, stacking rotor sheets to form a rotor body (3), keeping the positions of the through slots (4) on the rotor sheets corresponding to each other; S2, inserting non-magnetic connecting columns (8) into each mounting groove (5) of the through groove (4); S3, installing a connecting ring (10) at the central hole (9) of the rotor body (3); S4, inserting the magnetic steel (7) into the magnetic steel slot (6) of the rotor body (3).

10. The method for assembling a separate permanent magnet motor rotor structure according to claim 9, characterized in that: The rotor punching sheets are stacked and pressed, and the end surface of the rotor body (3) is flush with the end surfaces of the connecting column (8) and the connecting ring (10).

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