Centrifugal force compensation wedge-shaped clamping groove of rotor magnetic steel

Abstract

The utility model relates to the technical field of motor rotors, in particular to a centrifugal force compensation wedge-shaped clamping groove of rotor magnetic steel, which comprises a rotor punching sheet, a plurality of compensation wedge-shaped clamping grooves which are annularly arranged at equal intervals are arranged on the annular side surface of the rotor punching sheet, and each compensation wedge-shaped clamping groove is arranged along the length direction of the rotor punching sheet. The bottom of the compensation wedge-shaped clamping groove is located at the position close to the center of the rotor punching sheet, the notch portion of the compensation wedge-shaped clamping groove is located at the position close to the annular side face of the rotor punching sheet, the width of the bottom of the compensation wedge-shaped clamping groove is sequentially increased in the direction towards the notch portion to form an externally-expanded wedge-shaped cavity, and magnetic steel is embedded in the compensation wedge-shaped clamping groove. The side wall of the magnetic steel is attached to the groove wall of the compensation wedge-shaped clamping groove, and an outer through hole communicated with the outside is formed in the groove wall of the compensation wedge-shaped clamping groove located in the groove opening portion. The structure is firm and stable, and the problem of radial slippage of the magnetic steel can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of motor rotor technology, and more specifically, to a centrifugal force compensation wedge-shaped groove for rotor magnets. Background Technology

[0002] In the field of high-performance motors such as drive motors and high-speed motors for new energy vehicles, permanent magnet synchronous motors are widely used due to their advantages such as high power density and high efficiency. Among them, the rotor magnet is the core component, and its stable installation directly affects the motor performance and reliability. As the motor speed continues to increase, the magnet bears a huge radial load under the action of centrifugal force.

[0003] Patent CN107947412B discloses a high-strength permanent magnet synchronous motor rotor, comprising: a rotor lamination with a plurality of U-shaped magnetic slots along its circumference; each U-shaped magnetic slot includes at least two U-shaped magnetic slots arranged radially along the rotor lamination, with the U-shaped openings of the slots facing away from the center of the rotor lamination; a non-magnetic connector spanning the U-shaped magnetic slots along their width, with the connector having a strength greater than that of the rotor lamination; and magnets disposed within the U-shaped magnetic slots. This invention increases the structural strength of the rotor lamination at the magnetic bridge by incorporating non-magnetic connectors at the U-shaped magnetic slots. During rotor lamination rotation, the non-magnetic connectors can offset some of the inertial force, preventing breakage at the magnetic bridge and avoiding exacerbating magnetic leakage, thus overcoming the contradiction between structural strength and electromagnetic performance of rotor laminations in the prior art.

[0004] While the aforementioned technical solutions overcome the contradiction between the structural strength and electromagnetic performance of rotor laminations in existing technologies, the use of rectangular slots to assemble rotor magnets into rotor laminations also presents some shortcomings. For example, traditional rectangular slots rely solely on interference fits to constrain the magnets, with the centrifugal force direction perpendicular to the slot sidewall, lacking an effective compensation mechanism. Under high-speed conditions, the magnets are prone to radial slippage, affecting normal operation. Furthermore, under high rotation, the stress concentration between the slot and the magnet caused by centrifugal force can reach over 300 MPa, easily leading to magnet loosening, detachment, or even motor rotor rubbing accidents. Therefore, we propose a centrifugal force-compensating wedge-shaped slot for rotor magnets. Utility Model Content

[0005] The purpose of this invention is to provide a centrifugal force compensation wedge-shaped slot for rotor magnets, so as to solve the defect in the above-mentioned background art that the rectangular slots are prone to loosening and falling off when they are matched with the magnets.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The centrifugal force compensation wedge-shaped slot for the rotor magnet includes a rotor lamination. Multiple compensation wedge-shaped slots are arranged in a ring at equal intervals on the annular side of the rotor lamination. Each compensation wedge-shaped slot is arranged along the length of the rotor lamination. The bottom of the compensation wedge-shaped slot is located near the center of the rotor lamination, and the opening of the compensation wedge-shaped slot is located near the annular side of the rotor lamination. The width of the slot increases sequentially from the bottom towards the opening, forming an outwardly expanding wedge-shaped cavity. A magnet is embedded within the compensation wedge-shaped slot. After the magnet is embedded, its sidewall fits against the wall of the compensation wedge-shaped slot. An external through hole is provided on the wall of the compensation wedge-shaped slot located at the opening, communicating with the outside.

[0008] Preferably, a central shaft hole is provided at the center of the rotor lamination, and the central shaft hole is provided along the length direction of the rotor lamination;

[0009] Preferably, the rotor lamination has multiple positioning holes on its end face, the number of which is 3 to 6, and the depth of which is between 2 cm and 4 cm.

[0010] These two features allow the external drive shaft to pass through the central shaft hole for assembly, and then be positioned using the positioning hole.

[0011] Preferably, an auxiliary limiting structure is provided in the groove at one end of the compensation wedge-shaped slot, and the auxiliary limiting structure includes a bottom pad integrally formed on the rotor lamination.

[0012] The aforementioned bottom pad can abut against one end of the magnet to limit its movement and prevent the magnet from axially moving out of the compensating wedge groove.

[0013] Preferably, the size of the bottom pad is adapted to the size of the compensating wedge groove, an anti-rotation boss is fixedly installed on the inner surface of the bottom pad, and a hemispherical recess is provided on the bottom surface of the magnet. The anti-rotation boss and the hemispherical recess are interference-fitted to restrict the circumferential rotation of the magnet.

[0014] Preferably, an annular groove is provided on the end face of the rotor lamination away from the bottom pad, and an end limiting component for limiting the magnet is provided in the annular groove. The end limiting component includes a limiting retaining ring that is locked in the annular groove.

[0015] The above-mentioned limiting ring is used to limit the other end of the magnet, thereby further preventing the magnet from moving axially.

[0016] Preferably, a plurality of internal screw fixing protrusions are fixedly installed on the inner annular side of the limiting ring, the internal screw fixing protrusions are fixedly installed on the side of the rotor lamination, and the limiting ring abuts against the side of the magnet.

[0017] The aforementioned limiting ring is fixedly installed on the side of the rotor lamination with fastening screws, which facilitates the fixing and installation operation.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model, by setting an outwardly expanding wedge-shaped cavity to compensate for the wedge-shaped slot, allows the magnet to generate a component force along the wedge-shaped inclined surface under the action of centrifugal force after being embedded, forming a "self-locking" effect. This transforms the centrifugal force into a squeezing and fastening force, thereby achieving stable fixation of the magnet under high-speed rotation conditions and effectively solving the problem of easy radial slippage of the magnet in traditional rectangular slots.

[0020] 2. This utility model achieves comprehensive restriction on the axial movement and circumferential rotation of the magnet by using the interference fit between the bottom pad, anti-rotation boss and hemispherical recess on the bottom surface of the magnet in the auxiliary limiting structure, and the double limiting of the magnet at both ends by the limiting ring in the end limiting component, thereby further improving the stability and reliability of the magnet installation. Attached Figure Description

[0021] Figure 1 This is a partial structural schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the present invention after the end limiting component is assembled;

[0023] Figure 3 This is a schematic diagram of the auxiliary limiting structure after assembly of this utility model;

[0024] Figure 4 This is a schematic diagram of the end-limiting component of this utility model;

[0025] Figure 5 This is a schematic diagram of the present invention after the magnets are assembled.

[0026] The meanings of the labels in the diagram are as follows:

[0027] 1. Rotor lamination; 10. Central shaft hole; 11. Positioning hole; 12. Compensating wedge groove; 121. External through hole; 122. Groove opening; 123. Groove bottom; 13. Auxiliary limiting structure; 131. Bottom pad; 132. Anti-rotation boss;

[0028] 2. Annular groove;

[0029] 3. End limiting assembly; 30. Limiting retaining ring; 31. Internal screw fixing protrusion;

[0030] 4. Magnet; 40. Hemispherical pit. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1-5 This utility model provides a technical solution: a centrifugal force compensation wedge-shaped groove for rotor magnets, including a rotor lamination 1. Multiple compensation wedge-shaped grooves 12 are arranged in a ring at equal intervals on the annular side surface of the rotor lamination 1. Each compensation wedge-shaped groove 12 is arranged along the length direction of the rotor lamination 1. The bottom 123 of the compensation wedge-shaped groove 12 is located near the center of the rotor lamination 1, and the opening 122 of the compensation wedge-shaped groove 12 is located near the annular side surface of the rotor lamination 1. The width of the bottom 123 gradually increases towards the opening 122, forming an outwardly expanding wedge-shaped cavity. A magnet 4 is embedded in the compensation wedge-shaped groove 12. After the magnet 4 is embedded, its sidewall is in contact with the groove wall of the compensation wedge-shaped groove 12. Under high-speed rotation, the component force generated by centrifugal force can make the magnet 4 adhere tightly to the groove wall, converting the centrifugal force into a squeezing and fastening force, effectively preventing the magnet 4 from sliding radially during high-speed rotation.

[0033] In this embodiment, an external through hole 121 communicating with the outside is provided on the groove wall of the compensation wedge-shaped groove 12 located in the groove opening 122. The external through hole 121 can be used for heat dissipation.

[0034] like Figure 1 As shown, a central shaft hole 10 is provided at the center of the rotor lamination 1. The central shaft hole 10 is provided along the length direction of the rotor lamination 1. Multiple positioning holes 11 are provided on the end face of the rotor lamination 1. The number of positioning holes 11 is 3 to 6, and the depth of the positioning holes 11 is between 2 cm and 4 cm. This facilitates the external drive shaft to pass through the central shaft hole 10 for assembly, and then perform positioning operations in conjunction with the positioning holes 11.

[0035] Furthermore, an auxiliary limiting structure 13 is provided in the groove at one end of the compensating wedge-shaped slot 12. The auxiliary limiting structure 13 includes a bottom pad 131 integrally formed on the rotor lamination 1. The bottom pad 131 can abut against one end of the magnet 4 to limit the movement of the magnet 4 axially from the compensating wedge-shaped slot 12. The size of the bottom pad 131 is adapted to the size of the compensating wedge-shaped slot 12. An anti-rotation boss 132 is fixedly installed on the inner surface of the bottom pad 131. A hemispherical recess 40 is provided on the bottom surface of the magnet 4. The anti-rotation boss 132 and the hemispherical recess 40 are interference-fitted to limit the circumferential rotation of the magnet 4 and ensure the structural stability of the magnet 4 during assembly.

[0036] It is worth noting that an annular groove 2 is provided on the end face of the rotor lamination 1 away from the bottom pad 131. An end limiting component 3 for limiting the magnet 4 is provided in the annular groove 2. The end limiting component 3 includes a limiting ring 30 that is stuck in the annular groove 2. The limiting ring 30 is used to limit the other end of the magnet 4 to further prevent the magnet 4 from moving axially. Multiple internal screw fixing protrusions 31 are fixedly installed on the inner annular side of the limiting ring 30. The internal screw fixing protrusions 31 are fixedly installed on the side of the rotor lamination 1. The limiting ring 30 abuts against the side of the magnet 4. Specifically, the limiting ring 30 is fixedly installed on the side of the rotor lamination 1 with fastening screws to facilitate the fixed installation operation.

[0037] When using the centrifugal force compensation wedge groove of the rotor magnet of this utility model, the magnet 4 is slowly inserted into the compensation wedge groove 12 along the outwardly expanding wedge cavity, so that the side wall of the magnet 4 fits against the groove wall. At the same time, the hemispherical recess 40 on the bottom surface of the magnet 4 is interference-fitted with the anti-rotation protrusion 132 on the bottom pad 131 to complete the circumferential positioning.

[0038] Next, the limiting ring 30 is inserted into the annular groove 2 and pressed against the other end of the magnet 4 to achieve axial double limiting. The inner screw fixing protrusion 31 is then fixedly installed on the side of the rotor lamination 1 using fastening screws to complete the fixed installation.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A centrifugal force compensation wedge-shaped groove for rotor magnets, comprising rotor laminations (1), characterized in that: The rotor lamination (1) has a plurality of compensation wedge-shaped slots (12) arranged in a ring at equal intervals on its annular side surface. Each compensation wedge-shaped slot (12) is arranged along the length direction of the rotor lamination (1). The bottom (123) of the compensation wedge-shaped slot (12) is located near the center of the rotor lamination (1). The opening (122) of the compensation wedge-shaped slot (12) is located near the annular side surface of the rotor lamination (1). The width of the bottom (123) increases sequentially towards the opening (122) to form an outwardly expanding wedge-shaped cavity. A magnet (4) is embedded in the compensation wedge-shaped slot (12). After the magnet (4) is embedded, the side wall of the magnet (4) fits against the wall of the compensation wedge-shaped slot (12). An external through hole (121) connected to the outside is provided on the wall of the compensation wedge-shaped slot (12) located at the opening (122).

2. The centrifugal force compensation wedge-shaped groove for rotor magnets according to claim 1, characterized in that: A central shaft hole (10) is provided at the center of the rotor lamination (1), and the central shaft hole (10) is provided along the length direction of the rotor lamination (1).

3. The centrifugal force compensating wedge-shaped clamping slot of a rotor magnet of claim 1, wherein: The rotor lamination (1) has multiple positioning holes (11) on its end face. The number of positioning holes (11) is 3 to 6, and the depth of the positioning holes (11) is between 2 cm and 4 cm.

4. The centrifugal force compensating wedge-shaped clamping slot of a rotor magnet of claim 1, wherein: An auxiliary limiting structure (13) is provided in the groove at one end of the compensation wedge groove (12). The auxiliary limiting structure (13) includes a bottom pad (131) integrally formed on the rotor lamination (1).

5. The centrifugal force compensating wedge-shaped clamping slot of a rotor magnet of claim 4, wherein: The size of the bottom pad (131) is adapted to the size of the compensation wedge groove (12). An anti-rotation boss (132) is fixedly installed on the inner surface of the bottom pad (131). A hemispherical recess (40) is provided on the bottom surface of the magnet (4). The anti-rotation boss (132) and the hemispherical recess (40) are interference-fitted to restrict the circumferential rotation of the magnet (4).

6. The centrifugal force compensating wedge-shaped clamping slot of a rotor magnet of claim 5, wherein: An annular groove (2) is provided on the end face of the rotor lamination (1) away from the bottom pad (131). An end limiting component (3) for limiting the magnet (4) is provided in the annular groove (2). The end limiting component (3) includes a limiting ring (30) that is stuck in the annular groove (2).

7. The centrifugal force compensation wedge-shaped groove for rotor magnets according to claim 6, characterized in that: Multiple internal screw fixing protrusions (31) are fixedly installed on the inner annular side of the limiting ring (30). The internal screw fixing protrusions (31) are fixedly installed on the side of the rotor lamination (1). The limiting ring (30) abuts against the side of the magnet (4).

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