An integrated locking structure for motor rotor core and magnet

Abstract

This utility model discloses an integrated locking structure for a motor rotor core and magnets, including a rotor core, magnets, and a fastening assembly. The magnets are fixed in a circumferential array along the rotor core by the fastening assembly. The rotor core surface has grooves for embedding the magnets, each groove having an axially open end and an axially closed end. The magnets are axially inserted into the groove from the open end and abut against the closed end. The fastening assembly includes an axial insert fixed to one end of the magnet and a radial tightening member rotatably mounted on the magnet. The axial insert is inserted into a radial limiting structure at the closed end to achieve radial limiting of the magnet. The radial tightening member is screwed into an axial locking structure on the rotor core to achieve axial locking of the magnet. This utility model solves the problem of bidirectional loosening of magnets under high-speed operating conditions through dual fastening of axial insertion and radial limiting, and radial tightening and axial locking.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to an integrated locking structure for motor rotor core and magnet. Background Technology

[0002] Traditional permanent magnet motors typically use adhesive to fix the magnets. Adhesive bonding carries the risk of aging and failure; at high temperatures, the bond strength decreases, easily leading to magnet detachment. Especially in high-speed motors, the magnets are subjected to enormous centrifugal forces, and a single fixing method can easily cause loosening and displacement. This can result in electromagnetic vibration and noise, or even magnet breakage and damage to the motor. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides an integrated locking structure for motor rotor core and magnet, which solves the problem of bidirectional loosening of magnet under high-speed conditions by double fastening through axial insertion, radial limiting and radial tightening and axial locking.

[0004] Technical solution: To achieve the above objectives, this utility model provides an integrated locking structure for a motor rotor core and magnets, comprising a rotor core, magnets, and fastening components, wherein the magnets are fixed in a circumferential array along the rotor core by the fastening components.

[0005] The rotor core surface is provided with a groove for embedding magnets. The groove has an axial open end and an axial closed end. The magnet is axially inserted into the groove from the open end and abuts against the closed end.

[0006] The fastening assembly includes an axial insert fixed to one end of the magnet and a radial tightening member rotatably mounted on the magnet; the axial insert is inserted into a radial limiting structure located at the closed end to achieve radial limiting of the magnet; the radial tightening member is screwed into an axial locking structure located on the rotor core to achieve axial locking of the magnet.

[0007] Furthermore, the radial tightening member is disposed at the end of the magnet away from the axial insert; when the magnet abuts against the closed end, an assembly gap is formed between the open end and the adjacent end of the magnet.

[0008] Furthermore, the axial insert is a permanent magnet and is integrally formed with the magnet.

[0009] Furthermore, the closed end is provided with an axial insertion hole; the axial plug is inserted into the axial insertion hole to form the radial limiting structure.

[0010] Furthermore, the bottom of the groove is provided with a radial locking hole; the radial tightening member is screwed into the radial locking hole to form the axial locking structure.

[0011] Furthermore, the radial tightening component is a countersunk screw; the radial locking hole is a threaded hole, which is formed by tapping on the rotor core.

[0012] Furthermore, the rotor core is composed of multiple rotor laminations stacked axially.

[0013] Furthermore, the groove is formed by continuously butt-joining the notches on the edges of some of the rotor laminations after stacking.

[0014] Furthermore, the axial insertion hole is formed by continuously mating the through holes on some rotor laminations after stacking.

[0015] Furthermore, the end through hole constituting the axial insertion hole is closed by at least one rotor lamination without a through hole, making the axial insertion hole a blind hole structure.

[0016] Beneficial effects: This utility model achieves radial mechanical interlocking of the magnet through plug-in connection to resist centrifugal force, and generates axial clamping force through tightening to counteract axial vibration. Ultimately, it achieves dual fastening through radial limiting of axial plug-in connection and axial locking of radial tightening, solving the problem of bidirectional loosening of magnet under high-speed operating conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a top view of the magnet's structure.

[0019] Figure 3 This is a side view of the magnet structure.

[0020] Figure 4 A schematic diagram of a rotor lamination with a notch;

[0021] Figure 5 This is a schematic diagram of a rotor lamination with through holes. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, an integrated locking structure for a motor rotor core and magnets includes a rotor core 1, magnets 2, and a fastening assembly. The magnets 2 are fixed in a circumferential array along the rotor core 1 by the fastening assembly. The surface of the rotor core 1 is provided with a groove 4 for embedding the magnets 2. The groove 4 has an axially open end 41 and an axially closed end 42. The magnets 2 are axially inserted into the groove 4 from the open end 41 and abut against the closed end 42, providing a hard limit for the axial installation of the magnets 2 and preventing over-insertion.

[0024] The fastening assembly includes an axial insert 6 fixed to one end of the magnet 2 and a radial tightening member 7 rotatably mounted on the magnet 2. The axial insert 6 is inserted into the radial limiting structure located at the closed end 42 to achieve radial limiting of the magnet 2, thereby achieving radial mechanical interlocking of the magnet 2 through insertion to resist centrifugal force. The radial tightening member 7 is screwed into the axial locking structure located on the rotor core 1 to achieve axial locking of the magnet 2, thereby generating axial clamping force through tightening to counteract axial vibration. Ultimately, a dual fastening system is achieved through axial insertion for radial limiting and radial tightening for axial locking, solving the problem of bidirectional loosening of the magnet 2 under high-speed operating conditions.

[0025] The radial tightening member 7 is located at the end of the magnet 2 away from the axial insert 6, so that the locking force acts on the far end of the magnet 2, balancing the forces at both ends; when the magnet 2 abuts against the closed end 42, an assembly gap 5 is formed between the open end 41 and the adjacent end of the magnet 2, firstly to leave some margin to prevent the accumulation of tolerances that would prevent the magnet 2 from being installed, and secondly to allow the magnet 2 to expand and contract thermally, avoiding cracking or deformation caused by thermal stress.

[0026] The axial insert 6 is a permanent magnet and is integrally formed with the magnet 2, eliminating magnetic resistance at the connection interface and improving the continuity of the magnetic circuit; at the same time, it enhances the structural strength of the axial insert 6.

[0027] The closed end 42 is provided with an axial insertion hole 420, which provides precise guidance and containment limiting for the axial insert 6; the axial insert 6 is inserted into the axial insertion hole 420 to form the radial limiting structure. The bottom of the groove 4 is provided with a radial locking hole 4a, which directly utilizes the structure of the groove 4 body to achieve locking, avoiding the need for additional locking component installation positions; the radial tightening component 7 is screwed into the radial locking hole 4a to form the axial locking structure.

[0028] The radial tightening component 7 is a countersunk screw; the radial locking hole 4a is a threaded hole, which is machined by tapping on the rotor core 1. Attention must be paid to the tolerance matching of the threaded hole position. The position of the magnet 2 requires a positive tolerance, while the threaded hole at the rotor core 1 position requires a negative tolerance to prevent interference and inability to adjust during installation.

[0029] It is worth noting that in this utility model, in order to allow the rotor core 1 itself to participate in the fixing of the magnet 2, thereby achieving better structural integration and avoiding the rotor core 1 becoming isolated relative to other structures and affecting the overall fixing effect, therefore, as Figure 1 , Figure 4 and Figure 5As shown, the rotor core 1 is formed by axially stacking multiple rotor laminations 11. The groove 4 is formed by continuously butt-joining the notches 111 on the edges of some of the rotor laminations 11 after stacking. The axial insertion hole 420 is formed by continuously butt-joining the through holes 112 on some of the rotor laminations 11 after stacking. The end through hole 112 constituting the axial insertion hole 420 is closed by at least one rotor lamination 11 without a through hole 112, making the axial insertion hole 420 a blind hole structure. Both the groove 4 and the axial insertion hole 420 are formed by the geometry of the notches 111 and through holes 112 of the rotor laminations 11 during stacking, so that the fixing function of the magnet 2 is internalized into the core body, eliminating the structural isolation defects of traditional external fasteners.

[0030] Therefore, the rotor lamination 11 serves as both a magnetic circuit carrier and a mechanical locking structure.

[0031] This invention effectively resists radial dislodgement of the magnet caused by centrifugal force through radial mechanical interlocking between the axial insert and the closed-end socket; simultaneously, the clamping force generated by the radial tightening component suppresses axial movement of the magnet, providing double protection for high-speed operation stability. During assembly, the magnet automatically completes radial positioning by abutting against the closed end, matching the assembly tolerance with the gap at the open end, and allowing for thermal expansion and contraction of the magnet; the rotor core body structure deeply participates in fixation, achieving better structural integration and fixation effect.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An integrated locking structure for a motor rotor core and magnets, comprising a rotor core (1), magnets (2) and a fastening assembly, wherein the magnets (2) are fixed in a circumferential array along the rotor core (1) by the fastening assembly; Its features are: The rotor core (1) has a groove (4) on its surface for embedding a magnet (2). The groove (4) has an axial open end (41) and an axial closed end (42). The magnet (2) is axially inserted into the groove (4) from the open end (41) and abuts against the closed end (42). The fastening assembly includes an axial insert (6) fixed to one end of the magnet (2) and a radial tightening member (7) rotatably mounted on the magnet (2); the axial insert (6) is inserted into the radial limiting structure provided at the closed end (42) to achieve radial limiting of the magnet (2); the radial tightening member (7) is screwed into the axial locking structure provided on the rotor core (1) to achieve axial locking of the magnet (2).

2. The integrated locking structure for the motor rotor core and magnet as described in claim 1, characterized in that: The radial tightening member (7) is located at the end of the magnet (2) away from the axial insert (6); when the magnet (2) abuts against the closed end (42), an assembly gap (5) is formed between the open end (41) and the adjacent end of the magnet (2).

3. The integrated locking structure for the motor rotor core and magnet as described in claim 1 or 2, characterized in that: The axial insert (6) is a permanent magnet and is integrally formed with the magnet (2).

4. The integrated locking structure for the motor rotor core and magnet as described in claim 1 or 2, characterized in that: The closed end (42) is provided with an axial insertion hole (420); the axial plug (6) is inserted into the axial insertion hole (420) to form the radial limiting structure.

5. The integrated locking structure for the motor rotor core and magnet as described in claim 1 or 2, characterized in that: The bottom of the groove (4) is provided with a radial locking hole (4a); the radial tightening member (7) is screwed into the radial locking hole (4a) to form the axial locking structure.

6. The integrated locking structure for the motor rotor core and magnet as described in claim 5, characterized in that: The radial tightening member (7) is a countersunk screw; the radial locking hole (4a) is a threaded hole, which is formed by tapping on the rotor core (1).

7. The integrated locking structure for motor rotor core and magnet as described in claim 1, characterized in that: The rotor core (1) is composed of multiple rotor laminations (11) stacked axially.

8. The integrated locking structure for the motor rotor core and magnet as described in claim 7, characterized in that: The groove (4) is formed by continuously mating the notches (111) on the edges of some of the rotor laminations (11) after stacking.

9. The integrated locking structure for the motor rotor core and magnet as described in claim 7 or 8, characterized in that: The axial insertion hole (420) is formed by continuously mating the through holes (112) on some rotor laminations (11) after stacking.

10. The integrated locking structure for the motor rotor core and magnet as described in claim 9, characterized in that: The end through hole (112) constituting the axial insertion hole (420) is closed by at least one rotor lamination (11) without a through hole (112), so that the axial insertion hole (420) has a blind hole structure.

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