Rotor structure and electric machine

Abstract

The application discloses a rotor structure and a motor. The rotor structure comprises a rotor core body, a magnetic steel slot is arranged in the rotor core body, a magnetic steel is arranged in the magnetic steel slot, the magnetic steel is provided with at least one limiting boss for limiting the axial movement of the magnetic steel in the magnetic steel slot along the rotor core body, the limiting boss is embedded into the rotor core body, the rotor core body comprises a first core section and a second core section, and the first core section and the second core section can be separated at the positions corresponding to the limiting boss along the axial direction. Since the magnetic steel is provided with the limiting boss embedded into the rotor core body, the axial movement of the magnetic steel in the magnetic steel slot along the rotor core body is limited, so that the noise of the rotor in the running process is reduced; in addition, in order to facilitate assembly, the rotor core body is divided into the first core section and the second core section in the axial direction.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a rotor structure and a motor. Background Technology

[0002] Currently, most permanent magnet synchronous motors or permanent magnet synchronous reluctance motors require the permanent magnet to be installed into the rotor core, and then axially limited and locked at the front and rear ends of the core using rotor baffles or balance blocks. To meet assembly requirements, the axial fit between the permanent magnet and the core is a clearance fit. Furthermore, there is a difference in axial dimensions between the permanent magnet and the rotor core: if the height of the permanent magnet exceeds the height of the rotor core, the permanent magnet may be crushed by the baffle after axial locking, affecting reliability; if the height of the permanent magnet is lower than the height of the rotor core, there will be axial movement gaps within the magnet slots, which can easily cause noise during operation. Currently, the problem of the mismatch in axial height between the permanent magnet and the rotor core in existing technologies is difficult to solve effectively. Summary of the Invention

[0003] The purpose of this invention is to provide a rotor structure and motor that aims to solve the problem that when the height of the permanent magnet is lower than the height of the rotor core, there is an axial movement gap in the permanent magnet within the magnet slot, which easily causes noise during operation.

[0004] This invention provides a rotor structure, comprising:

[0005] The rotor core body has a magnetic steel groove inside, and a magnet is inserted into the magnetic steel groove. The magnet has at least one limiting boss for restricting the movement of the magnet within the magnetic steel groove along the axial direction of the rotor core body. The limiting boss is embedded in the rotor core body. The rotor core body includes a first core segment and a second core segment. Along the axial direction, the first core segment and the second core segment can be separated at corresponding positions of the limiting boss.

[0006] In some implementation methods:

[0007] The magnetic groove in the first iron core section has a limiting groove facing the opening of the second iron core section, and the limiting boss is located in the limiting groove.

[0008] In some implementation methods:

[0009] The magnet groove in the second core section has a limiting groove facing the opening of the first core section; the limiting boss is located in the limiting groove.

[0010] In some implementation methods:

[0011] The first iron core segment has a first groove in the magnetic groove facing the opening of the second iron core segment, and the second iron core segment has a second groove in the magnetic groove facing the opening of the first iron core segment. The first groove and the second groove are interlocked to form a limiting groove, and the limiting boss is located in the limiting groove.

[0012] In some implementation methods:

[0013] In the axial direction of the rotor core body, the width of the limiting boss is not less than the width of the limiting groove.

[0014] In some implementation methods:

[0015] When there is only one limiting boss, the length-to-width ratio of the limiting boss that mates with the limiting groove is the same as that of the magnet, and the volume of the magnet is 6-8 times the volume of the limiting boss.

[0016] In some implementation methods:

[0017] When there are two limiting bosses, and the two limiting bosses are arranged opposite each other on the magnet, the length-to-width ratio of the limiting boss that mates with the limiting groove is the same as that of the magnet, and the volume of the magnet is 12-16 times the volume of the limiting boss.

[0018] In some implementation methods:

[0019] The magnet has a chamfer at at least one end along the axial direction of the rotor core body. The chamfer includes a first chamfer and a second chamfer that are arranged opposite to each other. A magnet baffle is provided at at least one end along the axial direction of the rotor core body. A limiting protrusion is provided on the magnet baffle that abuts against the first chamfer and the second chamfer.

[0020] In some implementation methods:

[0021] The chamfer angle also includes a third chamfer angle and a fourth chamfer angle that are arranged opposite to each other. The third chamfer angle is arranged adjacent to the first chamfer angle and the second chamfer angle. The magnetic steel baffle is provided with a limiting protrusion that abuts against the third chamfer angle and the fourth chamfer angle.

[0022] In some implementation methods:

[0023] When the magnet is cut at an angle, the volume removed is less than or equal to the volume of a limiting boss.

[0024] The present invention also provides an electric motor, including the rotor structure described above.

[0025] This invention discloses a rotor structure and a motor. The rotor structure includes a rotor core body with a magnet slot within it. A magnet is inserted into the magnet slot, and the magnet has at least one limiting boss for restricting its axial movement within the magnet slot along the rotor core body. The limiting boss is embedded in the rotor core body. The rotor core body includes a first core segment and a second core segment. Along the axial direction, the first core segment and the second core segment can separate at corresponding positions of the limiting boss. Therefore, when the length of the magnet is less than the axial length of the rotor core body, although the magnet may move axially within the magnet slot after being inserted into the magnet slot, the limiting boss embedded in the rotor core body restricts its axial movement within the magnet slot, thus reducing rotor noise during operation. Furthermore, for ease of assembly, the rotor core body can be axially divided into a first core segment and a second core segment, with the dividing plane of the first and second core segments corresponding to the limiting boss. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the rotor structure provided in an embodiment of the present invention;

[0028] Figure 2 For the present invention Figure 1 A schematic diagram of the structure of the magnet in the diagram;

[0029] Figure 3 For the present invention Figure 1 A schematic diagram of the rotor core body in the diagram;

[0030] Figure 4 A schematic diagram of another rotor structure provided in an embodiment of the present invention;

[0031] Figure 5 For the present invention Figure 4 A schematic diagram of the structure of the magnet in the diagram;

[0032] Figure 6 For the present invention Figure 4 A schematic diagram of the rotor core body in the diagram;

[0033] Figure 7 This is a schematic diagram of the structure of the magnetic steel baffle provided in an embodiment of the present invention;

[0034] Figure 8 This is an embodiment of the present invention. Figure 1 The magnets and rotor core body and Figure 8 A schematic diagram of the assembled magnetic steel baffle.

[0035] Explanation of reference numerals in the attached figures:

[0036] 11. Magnet slot; 12. First core section; 13. Second core section; 14. Limiting slot;

[0037] 20. Magnet; 21. Limiting boss; 22. First beveled angle; 23. Second beveled angle;

[0038] 30. Magnetic steel baffle; 31. Limiting protrusion. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0041] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0042] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0043] like Figure 1-8 As shown, this embodiment provides a rotor structure, including:

[0044] The rotor core body can be formed by stacking single silicon steel sheets with thicknesses of 0.3, 0.35, or 0.5 mm. Specifically, the rotor core body is formed by stacking and fastening points. A magnet slot 11 is provided in the rotor core body, and a magnet 20 is inserted into the magnet slot 11. The magnet 20 has at least one limiting boss 21 for restricting the movement of the magnet 20 along the axial direction of the rotor core body within the magnet slot 11. The limiting boss 21 is embedded in the rotor core body. The rotor core body includes a first core segment 12 and a second core segment 13. Along the axial direction, the first core segment 12 and the second core segment 13 can be separated at positions corresponding to the limiting boss 21.

[0045] In this embodiment, the rotor structure includes: a rotor core body, a magnet slot 11 disposed within the rotor core body, a magnet 20 inserted into the magnet slot 11, and the magnet 20 having at least one limiting boss 21 embedded in the rotor core body. Specifically, the limiting boss 21 can be provided on one, two, three, or all four outer walls of the magnet 20. Therefore, the number of limiting bosses 21 can be one, two, three, or four, to restrict the magnet 20 from moving axially along the rotor core body within the magnet slot 11. Thus, when the length of the magnet 20... When the length is less than the axial length of the rotor core body, after the magnet 20 is installed in the magnet slot 11, although the magnet 20 moves axially within the slot 11, the limiting boss 21 embedded in the rotor core body restricts its movement within the slot 11, thus reducing rotor noise during operation. Furthermore, for ease of assembly, the rotor core body can be axially divided into a first core segment 12 and a second core segment 13, with the dividing planes of the first and second core segments corresponding to the limiting boss 21. The first core segment 12 and the second core segment 13 are fixedly connected by a snap-fit ​​connection.

[0046] The assembly sequence of the rotor structure is as follows: insert the magnet 20 into the magnet slot 11, embed the limiting boss 21 into the rotor core body (in the first core section 12, the second core section 13, or the part composed of the first core section 12 and the second core section 13), and then connect the first core section 12 and the second core section 13 to complete the pressing of the limiting boss 21 by the first core section 12 and the second core section 13.

[0047] In some implementation methods:

[0048] The opening of the magnet groove 11 on the first iron core section 12 facing the second iron core section 13 is constructed with a limiting groove 14, and the limiting boss 21 is located in the limiting groove 14.

[0049] In this embodiment, a limiting groove 14 is constructed on the opening of the magnet groove 11 in the first iron core section 12 facing the second iron core section 13, and a limiting boss 21 is located in the limiting groove 14. The limiting boss 21 is limited by constructing the limiting groove 14 on the opening of the magnet groove 11 in the first iron core section 12 facing the second iron core section 13, so as to restrict the magnet 20 from moving axially along the rotor core body in the magnet groove 11.

[0050] During assembly, one end of the magnet 20 can be inserted into the magnet groove 11 in the first iron core section 12, and the limiting boss 21 can be locked in the limiting groove 14 in the first iron core section 12. Then, the magnet groove 11 on the second iron core section 13 can be fitted onto the other end of the magnet 20. Then, the first iron core section 12 and the second iron core section 13 can be connected to complete the pressing of the limiting boss 21 between the first iron core section 12 and the second iron core section 13.

[0051] In some implementation methods:

[0052] The opening of the magnet groove 11 in the second iron core section 13 facing the first iron core section 12 is constructed with a limiting groove 14; the limiting boss 21 is located in the limiting groove 14.

[0053] like Figure 1-6 As shown, in this embodiment, a limiting groove 14 is constructed on the opening of the magnet groove 11 in the second iron core section 13 facing the first iron core section 12; the limiting boss 21 is located in the limiting groove 14. The limiting boss 21 is limited by the limiting groove 14 constructed on the opening of the magnet groove 11 in the second iron core section 13 facing the first iron core section 12, so as to restrict the magnet 20 from moving axially along the rotor core body in the magnet groove 11.

[0054] During assembly, one end of the magnet 20 can be inserted into the magnet groove 11 on the second iron core section 13, and the limiting boss 21 can be locked into the limiting groove 14 on the second iron core section 13. Then, the magnet groove 11 on the first iron core section 12 can be fitted onto the other end of the magnet 20. Then, the first iron core section 12 and the second iron core section 13 can be connected to complete the pressing of the limiting boss 21 between the first iron core section 12 and the second iron core section 13.

[0055] In some implementation methods:

[0056] The magnetic groove 11 in the first iron core section 12 has a first groove facing the opening of the second iron core section 13, and the magnetic groove 11 in the second iron core section 13 has a second groove facing the opening of the first iron core section 12. The first groove and the second groove are interlocked to form a limiting groove 14, and the limiting boss 21 is located in the limiting groove 14.

[0057] In this embodiment, a first groove is constructed in the magnetic steel groove 11 in the first iron core section 12 facing the opening of the second iron core section 13, and a second groove is constructed in the magnetic steel groove 11 in the second iron core section 13 facing the opening of the first iron core section 12. The first groove and the second groove are engaged to form a limiting groove 14. A limiting boss 21 is located in the limiting groove 14. The first groove and the second groove limit the limiting boss 21 to restrict the magnetic steel 20 from moving axially along the rotor iron core body in the magnetic steel groove 11.

[0058] During assembly, one end of the magnet 20 can be inserted into the magnet groove 11 on the first iron core section 12, and the limiting boss 21 can be locked in the first groove on the first iron core section 12. Then, the magnet groove 11 on the second iron core section 13 can be fitted onto the other end of the magnet 20, and the limiting boss 21 can be locked in the second groove on the second iron core section 13. Then, the first iron core section 12 and the second iron core section 13 can be connected to interlock the first groove and the second groove to form the limiting groove 14, thus completing the pressing of the limiting boss 21 between the first iron core section 12 and the second iron core section 13.

[0059] Alternatively, one end of the magnet 20 can be inserted into the magnet groove 11 on the second iron core section 13, and the limiting boss 21 can be locked in the first groove on the second iron core section 13. Then, the magnet groove 11 on the first iron core section 12 can be placed on the other end of the magnet 20, and the limiting boss 21 can be locked in the first groove on the first iron core section 12. Then, the first iron core section 12 and the second iron core section 13 can be connected to interlock the first groove and the second groove to form the limiting groove 14, thus completing the pressing of the limiting boss 21 by the first iron core section 12 and the second iron core section 13.

[0060] In some implementation methods:

[0061] In the axial direction of the rotor core body, the width of the limiting boss 21 is not less than the groove width of the limiting groove 14.

[0062] In this embodiment, the width of the limiting boss 21 in the axial direction of the rotor core body is not less than the groove width of the limiting groove 14. When the width of the limiting boss 21 is less than the groove width of the limiting groove 14 in the axial direction of the rotor core body, there is still a movement gap in the limiting boss 21 in the axial direction of the limiting groove 14. Therefore, the width of the limiting boss 21 in the axial direction of the rotor core body is not less than the groove width of the limiting groove 14, which can prevent the magnet 20 from having a movement gap in the axial direction of the magnet groove 11, and limit the movement of the magnet 20 in the magnet groove 11 along the axial direction of the rotor core body, thereby reducing the noise of the rotor during operation.

[0063] Accordingly, the structure of the limiting boss 21 of the magnet 20 and the limiting groove 14 of the rotor core body in the above structure have certain dimensional requirements. On the one hand, the structure should not be too small, as this may lead to structural instability and breakage.

[0064] In some implementation methods:

[0065] When there is only one limiting boss 21, the limiting boss 21 that mates with the limiting groove 14 has the same length-to-width ratio as the magnet 20, and the volume of the magnet 20 is 6-8 times the volume of the limiting boss 21.

[0066] like Figure 1-3 As shown, in this embodiment, when there is only one limiting boss 21, the limiting boss 21 that cooperates with the limiting groove 14 has the same length-to-width ratio as the magnet 20. The volume of the magnet 20 can be 6-8 times the volume of the limiting boss 21, which can ensure the strength of the limiting boss 21, prevent the limiting boss 21 from breaking during rotor operation, and improve the stability and reliability of rotor operation.

[0067] In some implementation methods:

[0068] When there are two limiting bosses 21, and the two limiting bosses 21 are arranged opposite to each other on the magnet 20, the length-to-width ratio of the limiting boss 21 that cooperates with the limiting groove 14 is the same as that of the magnet 20, and the volume of the magnet 20 is 12-16 times the volume of the limiting boss 21.

[0069] like Figure 4-6 As shown, in this embodiment, when there are two limiting bosses 21 and the two limiting bosses 21 are arranged opposite to each other on the magnet 20, the length-to-width ratio of the limiting bosses 21 that cooperate with the limiting groove 14 is the same as that of the magnet 20. Since the two limiting bosses 21 are subjected to forces on both sides, the size of the limiting bosses 21 can be appropriately reduced compared to when there is only one limiting boss 21. Therefore, when there are two limiting bosses 21, the volume of the magnet 20 can be 12-16 times the volume of the limiting bosses 21, which can also ensure the strength of the limiting bosses 21 and prevent the limiting bosses 21 from breaking during rotor operation, thereby improving the stability and reliability of rotor operation.

[0070] In some implementation methods:

[0071] The magnet 20 has a chamfer at at least one end along the axial direction of the rotor core body. The chamfer includes a first chamfer 22 and a second chamfer 23 that are arranged opposite to each other. A magnet baffle 30 is provided at at least one end along the axial direction of the rotor core body. A limiting protrusion 31 is provided on the magnet baffle 30 that abuts against the first chamfer 22 and the second chamfer 23.

[0072] like Figure 2 , Figure 5 , Figure 7 as well as Figure 8As shown, in this embodiment, the magnet 20 has a chamfer at at least one end along the axial direction of the rotor core body. The chamfer includes a first chamfer 22 and a second chamfer 23 that are arranged opposite to each other. A magnet baffle 30 is provided at at least one end along the axial direction of the rotor core body. The magnet baffle 30 can be fixed to one end along the axial direction of the rotor core body by screws or rivets. The magnet baffle 30 is provided with a limiting protrusion 31 that abuts against the first chamfer 22 and the second chamfer 23. Since the first chamfer 22 and the second chamfer 23 are arranged opposite to each other, the magnet baffle 30... A limiting protrusion 31 is provided, which abuts against the first oblique angle 22 and the second oblique angle 23. The limiting protrusion 31 can clamp the first oblique angle 22 and the second oblique angle 23. Therefore, the limiting protrusion 31 restricts the movement of the magnet 20 in the direction from the first oblique angle 22 to the second oblique angle 23 and restricts the movement of the magnet 20 in the direction from the second oblique angle 23 to the first oblique angle 22 (i.e., in the direction perpendicular to the radial direction of the rotor core body). This can further reduce the shaking of the magnet 20 in the magnet slot 11 and reduce the noise of the rotor during operation. In addition, the oblique angle of the magnet 20 can improve the demagnetization of the magnet edges.

[0073] In some implementation methods:

[0074] The chamfer angle also includes a third chamfer angle and a fourth chamfer angle that are arranged opposite to each other. The third chamfer angle is arranged adjacent to the first chamfer angle 22 and the second chamfer angle 23. The magnetic steel baffle 30 is provided with a limiting protrusion 31 that abuts against the third chamfer angle and the fourth chamfer angle.

[0075] In this embodiment, the chamfered angle also includes a third chamfered angle and a fourth chamfered angle arranged opposite to each other. The third chamfered angle is arranged adjacent to the first chamfered angle 22 and the second chamfered angle 23. The magnetic baffle 30 is provided with a limiting protrusion 31 that abuts against the third chamfered angle and the fourth chamfered angle. Since the third chamfered angle and the fourth chamfered angle are arranged opposite to each other, and the magnetic baffle 30 is provided with a limiting protrusion 31 that abuts against the third chamfered angle and the fourth chamfered angle, the limiting protrusion 31 can clamp the third chamfered angle and the fourth chamfered angle. The protrusion 31 restricts the movement of the magnet 20 in the direction from the third oblique angle to the fourth oblique angle and also restricts the movement of the magnet 20 in the direction from the fourth oblique angle to the third oblique angle. Since the third oblique angle is adjacent to the first oblique angle 22 and the second oblique angle 23, and the magnet 20 is generally a cuboid, the movement of the magnet 20 in the magnetic slot 11 along the radial direction of the rotor core body is now restricted. Therefore, the shaking of the magnet 20 in the magnetic slot 11 can be further reduced, and the noise of the rotor during operation can be reduced.

[0076] In some implementation methods:

[0077] When a bevel is formed on the magnet 20, the volume removed is less than or equal to the volume of a limiting boss 21.

[0078] In this embodiment, when forming a beveled angle on the magnet 20, the volume cut off is less than or equal to the volume of a limiting boss 21. That is, after cutting off the volume of the cutting block on the magnet 20 to form a beveled angle, the volume of the cutting block is less than or equal to the volume of a limiting boss 21, so as to prevent the cutting block from being too large and causing a decrease in the change of total magnetic flux.

[0079] In summary, the embodiments of the present invention solve the problems of reduced efficiency caused by interference fit of magnets 20, as well as the problems of high noise and strong vibration when the rotor rotates; solve the problem that the position of each magnet 20 inside the rotor core body is consistent due to the core height difference of the rotor core body during rotor assembly; solve the problem of high harmonic content; and also solve the problem of easy demagnetization of the magnet edges and corners.

[0080] This invention also provides an electric motor, including the rotor structure described above.

[0081] The motor of the present invention is a motor in which a magnet 20 is installed inside the rotor core body that requires a rotor structure.

[0082] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0083] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A rotor structure, characterized in that, include: The rotor core body has a magnetic steel groove inside, a magnet is inserted into the magnetic steel groove, and the magnet has at least one limiting boss for restricting the movement of the magnet within the magnetic steel groove along the axial direction of the rotor core body. The limiting boss is embedded in the rotor core body. The rotor core body includes a first core segment and a second core segment. Along the axial direction, the first core segment and the second core segment can be separated at positions corresponding to the limiting boss. The magnetic groove in the first core segment is configured with a limiting groove facing the opening of the second core segment, and the limiting boss is located in the limiting groove; in the axial direction of the rotor core body, the width of the limiting boss is not less than the groove width of the limiting groove. The magnet has a chamfer at at least one end along the axial direction of the rotor core body. The chamfer includes a first chamfer and a second chamfer that are arranged opposite to each other. A magnet baffle is provided at at least one end along the axial direction of the rotor core body. A limiting protrusion is provided on the magnet baffle that abuts against the first chamfer and the second chamfer. The chamfer angle further includes a third chamfer angle and a fourth chamfer angle arranged opposite to each other. The third chamfer angle is arranged adjacent to the first chamfer angle and the second chamfer angle. The magnetic steel baffle is provided with a limiting protrusion that abuts against the third chamfer angle and the fourth chamfer angle. When the magnet forms the bevel angle, the volume cut off is less than or equal to the volume of one of the limiting bosses.

2. The rotor structure according to claim 1, characterized in that: The magnetic groove in the second core segment is configured with a limiting groove facing the opening of the first core segment; the limiting boss is located in the limiting groove.

3. The rotor structure according to claim 1, characterized in that: The magnetic groove in the first iron core segment has a first groove facing the opening of the second iron core segment, and the magnetic groove in the second iron core segment has a second groove facing the opening of the first iron core segment. The first groove and the second groove are engaged to form a limiting groove, and the limiting boss is located in the limiting groove.

4. The rotor structure according to any one of claims 1-3, characterized in that: When there is one limiting boss, the aspect ratio of the limiting boss that mates with the limiting groove to the magnet is the same, and the volume of the magnet is 6-8 times the volume of the limiting boss.

5. The rotor structure according to any one of claims 1-3, characterized in that: When there are two limiting bosses, and the two limiting bosses are arranged opposite to each other on the magnet, the length-to-width ratio of the limiting boss that cooperates with the limiting groove is the same as that of the magnet, and the volume of the magnet is 12-16 times the volume of the limiting boss.

6. An electric motor, characterized in that: Includes the rotor structure as described in any one of claims 1 to 5.

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