Rotor laminations, cast aluminum rotors and rotating electric motors

Abstract

This utility model provides a rotor lamination, a cast aluminum rotor, and a rotary motor. The rotor lamination includes: a lamination body with a lamination shaft hole; a rotor slot, on which a plurality of closed-profile rotor slots are spaced apart along the circumference of the lamination body; radially, a first arc-shaped segment is formed at the first end of the rotor slot, and a second arc-shaped segment is formed at the second end opposite to it, the line connecting the first center point of the first arc-shaped segment and the second center point of the second arc-shaped segment extending radially along the lamination body; straight or arc segments are connected on both sides of the first and second arc-shaped segments respectively to form a rotor slot; a slot opening, on which a plurality of radially open slots are spaced apart on the outer circumference of the lamination body; each slot opening corresponds to a rotor slot, and the center line of each slot opening coincides with the center line of the corresponding rotor slot; a partition is formed between the slot opening and the rotor slot in the radial direction of the lamination body. This application solves the problem of aluminum molten leakage caused by slot openings in the manufacturing of cast aluminum rotors.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing, and in particular to a rotor lamination, a cast aluminum rotor, and a rotary motor. Background Technology

[0002] In the field of motor design and manufacturing, cast aluminum rotors are widely used due to their simple structure and good operating performance. However, for closed-slot cast aluminum rotors, the rotor leakage reactance is usually relatively large, which directly leads to poor motor performance and low starting torque. In addition, the closed-slot design of cast aluminum rotors restricts the current distribution in the conductors, resulting in a strong skin effect. This not only reduces the efficiency of the motor but also results in a low power factor, limiting its use in certain high-performance applications.

[0003] Compared with closed-slot cast aluminum rotors, open-slot cast aluminum rotors can reduce additional losses and improve the starting performance of motors. However, during the casting process, molten aluminum may overflow from the open slots or completely fill the slots, which increases the complexity of subsequent processing and cleaning. Residual leaked aluminum can affect the electromagnetic performance and heat dissipation efficiency of the motor, increase motor losses, and even reduce the yield rate of motor production. Utility Model Content

[0004] This invention provides a rotor lamination, a cast aluminum rotor, and a rotary motor, which can solve the problem of molten aluminum overflowing from the open slot during the production process of existing cast aluminum rotors, effectively reducing the complexity of subsequent processing and cleaning, improving the electromagnetic performance and heat dissipation efficiency of the rotary motor, and increasing the yield rate of rotary motor production.

[0005] To solve the above-mentioned technical problems, this utility model provides a rotor lamination, including a lamination body, rotor slots, and slot openings; the lamination body has a lamination shaft hole coaxial with the lamination body; a plurality of rotor slots are spaced apart along the circumference on the lamination body, and the rotor slots have a closed profile; along the radial direction of the lamination body, a first arc-shaped segment is formed at the first end of the rotor slot, and a second arc-shaped segment is formed at the second end of the rotor slot, wherein the openings of the first arc-shaped segment and the second arc-shaped segment are opposite to each other, and the first center point of the first arc-shaped segment is aligned with the first center point of the second arc-shaped segment. The line connecting the two center points extends radially along the lamination body; straight or curved segments are connected to the first and second arc segments on both sides respectively, thereby enclosing and forming a rotor slot; multiple slots are spaced apart on the outer circumference of the lamination body, and the multiple slots form radial openings on the outer circumference of the lamination body; the number of slots is equal to the number of rotor slots, each slot corresponds to one rotor slot, and the center line of each slot coincides with the center line of the corresponding rotor slot; a partition is formed between the slot and the rotor slot in the radial direction of the lamination body.

[0006] The rotor lamination provided by this utility model, by aligning the openings of the first and second arc-shaped segments of the rotor slot, and connecting corresponding straight or arc segments on both sides of the first and second arc-shaped segments to form the rotor slot, creates a smooth rotor slot profile, which improves the electromagnetic performance of the rotating motor. By adjusting the curvature radii of the first and second arc-shaped segments, the starting performance and operating efficiency of the rotor can be optimized. Furthermore, by setting multiple slots with radial openings at intervals on the outer circumference of the lamination body, the leakage flux generated by the conductor current within the slots can be reduced, correspondingly lowering the rotor leakage reactance and increasing the effective magnetic flux within the conductor, thereby improving the stator's electromagnetic performance. The reduced reactive power component improves the power factor. The design, where each slot coincides with the centerline of its corresponding rotor slot and the number of slots is equal, ensures a more uniform layout of slots on the rotor core, facilitating rotational balance and machining. Furthermore, the slots increase the heat dissipation area on the rotor surface, improving temperature control under high loads and enhancing the reliability and lifespan of the motor. The partition formed between the slots and rotor slots separates them, preventing molten aluminum from overflowing during the casting of aluminum guide bars in the rotor slots, eliminating the need for subsequent cleaning, ensuring a complete slot outline, and ultimately achieving efficient and safe operation of the motor.

[0007] Furthermore, along the radial direction of the lamination body, the first arc-shaped segment is located inside the second arc-shaped segment, and the radius of curvature of the first arc-shaped segment is smaller than that of the second arc-shaped segment. This structure can reduce rotor leakage reactance and rotor loss while maintaining the mechanical strength of the rotor slots, reducing stress concentration, and avoiding deformation caused by centrifugal force during high-speed rotation.

[0008] Furthermore, the first and second arc-shaped segments are respectively connected on both sides by two straight line segments with a gradually decreasing radial spacing, and the opposing straight line segments of any two adjacent rotor slots are parallel to each other. This design achieves a smooth transition of magnetic field lines through the gradually changing rotor slot width, reducing losses and electromagnetic noise. By setting the opposing straight line segments of any two adjacent rotor slots to be parallel, specific order harmonics are weakened, the radial force wave amplitude is reduced, and the mechanical stiffness is homogenized, thereby reducing vibration noise.

[0009] Furthermore, at the centerline of the rotor slot, the width of the partition is greater than or equal to 0.4 mm. By setting a partition with a width greater than or equal to 0.4 mm, this design avoids molten aluminum filling the slot opening during casting, solving the problem of cleaning the slot opening, while ensuring that the partition has sufficient mechanical strength.

[0010] Furthermore, the groove depth is 2mm to 3mm in the radial direction of the lamination body; and the groove width is 2mm to 4mm in the circumferential direction of the lamination body. This design reduces the leakage flux generated by the conductor current in the rotor slots, thereby controlling the leakage reactance within a reasonable range and increasing the effective magnetic flux within the conductors. On the other hand, the groove depth increases the heat dissipation area on the rotor surface, allowing the outer circumference of the rotor to contact the cooling airflow more fully, thus reducing the rotor temperature.

[0011] Furthermore, the rotor lamination also includes multiple ventilation slots spaced circumferentially on the lamination body, with the ventilation slots radially positioned between the lamination shaft hole and the rotor slot. The ventilation slots increase the airflow path inside the rotor, more effectively removing the heat generated during motor operation, thereby ensuring the performance of the rotating motor and extending its service life.

[0012] Furthermore, the number of ventilation slots is less than the number of rotor slots; the ventilation slots have a trapezoidal profile, with the top edge facing the lamination shaft hole and the bottom edge facing the rotor slot, and the length of the bottom edge is greater than the length of the top edge. In particular, the trapezoidal profile of the ventilation slots, with the longer bottom edge facing the rotor slot, better adapts to the circular structure of the rotor laminations, facilitating the directional guidance of cooling air and improving heat dissipation efficiency. The design of having fewer ventilation slots than rotor slots ensures heat dissipation performance while avoiding excessive weakening of the mechanical structure.

[0013] This utility model also provides a cast aluminum rotor, including: a rotor core, cast aluminum guide bars, and a shaft; the rotor core is formed by pressing together multiple rotor laminations overlapped axially and aligned by rotational angle; along the axial direction of the rotor core, the lamination shaft holes of multiple rotor laminations are aligned and overlapped to form shaft mounting holes, the corresponding rotor slots of multiple rotor laminations are aligned and overlapped to form multiple guide bar receiving slots, and the corresponding slot openings of multiple rotor laminations are aligned and overlapped to form multiple channels; the number of cast aluminum guide bars is equal to the number of guide bar receiving slots, and the cast aluminum guide bars fill the corresponding guide bar receiving slots; the shaft is mounted in the shaft mounting hole, and a torque transmission structure is provided between the mating surfaces of the shaft and the shaft mounting hole. By adopting the above-mentioned rotor lamination structural design, the cast aluminum rotor ensures that the cast aluminum guide bars can be accurately filled into the guide bar receiving slots, thus ensuring the electrical performance and mechanical strength of the cast aluminum rotor.

[0014] The cast aluminum rotor provided in this disclosure uses the aforementioned rotor laminations. Since these rotor laminations have the advantages of preventing aluminum leakage and enhancing heat dissipation, the cast aluminum rotor also has good quality in these aspects.

[0015] Furthermore, the cast aluminum rotor also includes a balance ring assembly and an internal fan assembly. The balance ring assembly is mounted on the shaft at the first axial end of the rotor core; the internal fan assembly is mounted on the shaft at the second axial end of the rotor core. The addition of the balance ring assembly and the internal fan assembly optimizes the dynamic balance and internal cooling of the cast aluminum rotor, respectively. The balance ring assembly reduces vibration and noise during operation, improving the stability and lifespan of the rotating motor. The internal fan assembly enhances airflow within the cast aluminum rotor, further improving cooling efficiency and enabling the rotating motor to maintain stable operation under higher loads.

[0016] This utility model also provides a rotary motor, including the above-mentioned cast aluminum rotor, stator assembly and motor body, wherein the stator assembly is installed in the motor body and the cast aluminum rotor is coaxially disposed in the stator assembly.

[0017] The rotary motor provided in this disclosure uses the aforementioned cast aluminum rotor. Since the cast aluminum rotor has the advantages of avoiding aluminum leakage and enhancing heat dissipation, the rotary motor also has good quality in the corresponding aspects. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the rotor lamination;

[0020] Figure 2 This is a partial schematic diagram of the rotor lamination;

[0021] Figure 3 This is a partial schematic diagram of the cast aluminum rotor;

[0022] Figure 4 This is a partial cross-sectional view of the cast aluminum rotor;

[0023] Figure 5 This is a partial cross-sectional view of the rotary electric motor.

[0024] Explanation of icon numbers:

[0025] 1. Cast aluminum rotor; 11. Rotor core; 111. Lamination body;

[0026] 112. Rotor slot; 121. First arc-shaped segment; 122. Second arc-shaped segment;

[0027] 113. Groove; 114. Ventilation groove; 115. Lamination shaft hole;

[0028] 13. Cast aluminum guide bar; 14. Rotating shaft; 15. Balance ring assembly;

[0029] 16. Internal fan assembly;

[0030] 2. Stator assembly;

[0031] 3. Motor body. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form.

[0034] Figure 1 This is a schematic diagram of a rotor lamination, showing its structure. Figure 2 This is a partial schematic diagram of the rotor laminations, showing the specific structural relationship between the rotor slots 112 and slot openings 113.

[0035] See Figure 1 and Figure 2According to the present invention, a rotor lamination includes a lamination body 111, a rotor slot 112, and a slot opening 113. The lamination body 111 has a lamination shaft hole 115 coaxial with the lamination body 111. A plurality of rotor slots 112 are spaced circumferentially on the lamination body 111, each rotor slot 112 having a closed profile. Along the radial direction of the lamination body 111, a first arcuate segment 121 is formed at the first end of each rotor slot 112, and a second arcuate segment 122 is formed at the second end of each rotor slot 112. The openings of the first arcuate segment 121 and the second arcuate segment 122 face each other, and the line connecting the first center point of the first arcuate segment 121 and the second center point of the second arcuate segment 122 is along the radial direction of the lamination body 111. The lamination body 111 extends radially; straight or curved segments are connected on both sides of the first arc segment 121 and the second arc segment 122 respectively, thereby enclosing and forming a rotor slot 112; a plurality of slots 113 are spaced apart on the outer circumference of the lamination body 111, and the plurality of slots 113 form radial openings on the outer circumference of the lamination body 111; the number of slots 113 is equal to the number of rotor slots 112, each slot 113 corresponds to one rotor slot 112, and the center line of each slot 113 coincides with the center line of the corresponding rotor slot 112; a partition is formed between the slots 113 and the rotor slots 112 in the radial direction of the lamination body 111.

[0036] The rotor lamination of this invention features a rotor slot 112 with its openings of the first arc-shaped segment 121 and the second arc-shaped segment 122 facing each other. Straight or curved segments are connected to the first arc-shaped segment 121 and the second arc-shaped segment 122 on both sides to form the rotor slot 112, creating a smooth rotor slot 112 profile. This improves the electromagnetic performance of the rotating motor. By adjusting the curvature radii of the first and second arc-shaped segments 121 and 122, the starting performance and operating efficiency of the rotor can be optimized. Furthermore, by setting multiple slots 113 at intervals on the outer circumference of the lamination body 111, forming radial openings on the outer circumference of the lamination body 111, the leakage flux generated by the conductor current within the slot can be reduced, correspondingly lowering the rotor leakage reactance and increasing the effective magnetic flux within the conductor. The addition of slots reduces the reactive portion of the stator current, improving the power factor. Each slot 113 coincides with the centerline of the corresponding rotor slot 112, and the number of slots is equal. This design makes the layout of slots 113 on the rotor core 11 more uniform, which is beneficial for achieving rotational balance and facilitating processing. In addition, the slots 113 can also increase the heat dissipation area on the rotor surface, which is beneficial for temperature control of the rotating motor under high load conditions, improving the reliability and service life of the rotating motor. The partition formed between the slots 113 and the rotor slots 112 can separate the slots 113 and the rotor slots 112, thereby preventing aluminum liquid from overflowing during the casting of aluminum guide bars in the rotor slots 112, eliminating the need for subsequent cleaning work, ensuring the integrity of the slot 113's outline, and thus achieving efficient and safe operation of the rotating motor.

[0037] More specifically, along the radial direction of the lamination body 111, the first arc-shaped segment 121 is disposed inside the second arc-shaped segment 122, and the radius of curvature of the first arc-shaped segment 121 is smaller than the radius of curvature of the second arc-shaped segment 122. This structure allows for the reduction of rotor leakage reactance and rotor losses while maintaining the mechanical strength of the rotor slot 112, reducing stress concentration, and preventing deformation caused by centrifugal force during high-speed rotation.

[0038] In some specific embodiments, the first arc segment 121 and the second arc segment 122 are respectively connected on both sides by two straight line segments with a gradually decreasing radial spacing, and the straight line segments opposite to each other of any two adjacent rotor slots 112 are parallel to each other. This design makes the magnetic field lines transition smoothly through the gradually changing width of the rotor slots 112, reducing losses and electromagnetic noise. By setting the straight line segments opposite to each other of any two adjacent rotor slots 112 to be parallel, specific order harmonics are weakened, the radial force wave amplitude is reduced, and the mechanical stiffness is homogenized, thereby reducing vibration noise.

[0039] In some further embodiments, the width of the partition at the centerline of the rotor slot 112 is greater than or equal to 0.4 mm. By setting a partition with a width greater than or equal to 0.4 mm, this design avoids molten aluminum filling the slot 113 during casting, solves the problem of cleaning the slot 113, and ensures that the partition has sufficient mechanical strength.

[0040] For example in Figure 1 and Figure 2 In the illustrated embodiment, the depth of the slot 113 in the radial direction of the lamination body 111 is 2 mm to 3 mm; and the width of the slot 113 in the circumferential direction of the lamination body 111 is 2 mm to 4 mm. This design reduces the leakage flux generated by the conductor current within the rotor slot 112, thereby controlling the leakage reactance within a reasonable range and increasing the effective magnetic flux within the conductor. Furthermore, the depth of the slot 113 increases the heat dissipation area on the rotor surface, allowing the outer circumference of the rotor to contact the cooling air more fully, thus reducing the rotor temperature.

[0041] Specifically, the rotor lamination also includes a plurality of ventilation slots 114 spaced circumferentially on the lamination body 111. The ventilation slots 114 are radially positioned between the lamination shaft hole 115 and the rotor slot 112 on the lamination body 111. The ventilation slots 114 increase the airflow path inside the rotor, more effectively removing the heat generated during the operation of the rotating motor, thereby ensuring the performance of the rotating motor and extending its service life.

[0042] In some embodiments, the number of ventilation slots 114 is less than the number of rotor slots 112; the ventilation slots 114 have a trapezoidal profile, with the top edge of the ventilation slot 114 facing the lamination shaft hole 115 and the bottom edge of the ventilation slot 114 facing the rotor slot 112, the length of the bottom edge being greater than the length of the top edge. In particular, the trapezoidal profile of the ventilation slots 114, with the longer bottom edge facing the rotor slot 112, better adapts to the circular structure of the rotor laminations, facilitating the directional guidance of cooling air and improving heat dissipation efficiency. The design of having fewer ventilation slots 114 than rotor slots 112 ensures heat dissipation performance while avoiding excessive weakening of the mechanical structure.

[0043] Figure 3 This is a partial schematic diagram of the cast aluminum rotor 1, showing the position of the cast aluminum guide bar 13 in the rotor core 11. Figure 4 This is a partial cross-sectional view of the cast aluminum rotor 1, showing the specific structure of the cast aluminum rotor 1.

[0044] See Figure 3 and Figure 4This utility model also provides a cast aluminum rotor 1, including: a rotor core 11, cast aluminum guide bars 13, and a rotating shaft 14; the rotor core 11 is formed by overlapping and rotating multiple rotor laminations along the axial direction; along the axial direction of the rotor core 11, the lamination shaft holes 115 of multiple rotor laminations are aligned and overlapped to form shaft mounting holes, the corresponding rotor slots 112 of multiple rotor laminations are aligned and overlapped to form multiple guide bar receiving slots, and the corresponding slot openings 113 of multiple rotor laminations are aligned and overlapped to form multiple channels; the number of cast aluminum guide bars 13 is equal to the number of guide bar receiving slots, and the cast aluminum guide bars 13 are filled in the corresponding guide bar receiving slots; the rotating shaft 14 is assembled in the shaft mounting holes, and a torque transmission structure is provided between the mating surfaces of the rotating shaft 14 and the shaft mounting holes. By adopting the above-mentioned rotor lamination structural design, the cast aluminum rotor 1 ensures that the cast aluminum guide bars 13 can be accurately filled in the guide bar receiving slots, thus ensuring the electrical performance and mechanical strength of the cast aluminum rotor 1. Specifically, the torque transmission structure mentioned above can be a keyed connection, interference fit, spline connection, end plate welding, etc.

[0045] The cast aluminum rotor 1 of this utility model adopts the above-mentioned rotor lamination. Since the rotor lamination has the advantages of avoiding aluminum leakage and enhancing heat dissipation, the cast aluminum rotor 1 also has good quality in the corresponding aspects.

[0046] More specifically, by setting the slots formed by slot 113, slots are formed on the outer surface of the rotor laminations. The original cooling circumference is the outer circumference of the rotor core 11, L1 = π × D. Taking the SH355-4 model as an example, where the diameter D = 380 mm, the outer circumference L1 = 1193.2 mm. After setting slot 113, the total length of the cooling surface is L2 = π × D + n × 2h, where n is the number of rotor slots 112, which is 36, and h is the opening height of slot 113, which is 2. The total length of the cooling surface is L2 = 1377.2 mm, and L2 / L1 = 115.4%. Since the length of the rotor core 11 remains unchanged, the cooling area increases by 15.4%.

[0047] More specifically, the cast aluminum rotor 1 further includes a balance ring assembly 15 and an internal fan assembly 16. The balance ring assembly 15 is disposed on the rotating shaft 14 at the first axial end of the rotor core 11; the internal fan assembly 16 is disposed on the rotating shaft 14 at the second axial end of the rotor core 11. The addition of the balance ring assembly 15 and the internal fan assembly 16 optimizes the dynamic balance and internal cooling of the cast aluminum rotor 1, respectively. The balance ring assembly 15 reduces vibration and noise during operation of the cast aluminum rotor 1, improving the stability and lifespan of the rotating motor. The internal fan assembly 16 enhances airflow inside the cast aluminum rotor 1, further improving cooling efficiency and enabling the rotating motor to maintain stable operation under high loads.

[0048] Figure 5This is a partial sectional view of a rotating electric machine, showing the assembly structure of the cast aluminum rotor 1, stator assembly 2, and motor body 3.

[0049] See Figure 5 The present invention also provides a rotary motor, including the aforementioned cast aluminum rotor 1, stator assembly 2 and motor body 3, wherein the stator assembly 2 is installed inside the motor body 3, and the cast aluminum rotor 1 is coaxially disposed inside the stator assembly 2.

[0050] The rotary motor of this invention uses the aforementioned cast aluminum rotor 1. Since the cast aluminum rotor 1 has the advantages of avoiding aluminum leakage and enhancing heat dissipation, the rotary motor also has good quality in the corresponding aspects.

[0051] The technical advantages of this invention are as follows: The rotor laminations of this application effectively control leakage flux, reduce rotor leakage reactance, and increase the effective magnetic flux of the conductors, thereby improving the power factor and starting performance while reducing losses. The partitions provided in the rotor slots 112 and slot openings 113 prevent the overflow of molten aluminum during casting, simplifying subsequent processing and cleaning, and improving production efficiency. Furthermore, the through-slots formed by slot openings 113 increase the rotor's surface area, improving heat dissipation efficiency. Combined with the ventilation slot 114 structure, this effectively reduces rotor temperature, improves the operational stability of the rotating motor, and extends the service life of the rotating motor.

[0052] The above are merely preferred embodiments of this 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 this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A rotor lamination, characterized in that, include: The lamination body (111) has a lamination shaft hole (115) coaxial with the lamination body (111). A plurality of rotor slots (112) are spaced apart circumferentially on the lamination body (111), and the rotor slots (112) have a closed profile. Along the radial direction of the lamination body (111), a first arc segment (121) is formed at the first end of the rotor slot (112), and a second arc segment (122) is formed at the second end of the rotor slot (112). The openings of the first arc segment (121) and the second arc segment (122) are opposite to each other, and the line connecting the first center point of the first arc segment (121) and the second center point of the second arc segment (122) extends radially along the lamination body (111). Straight segments or arc segments are respectively connected on both sides of the first arc segment (121) and the second arc segment (122) to enclose and form the rotor slot (112). A plurality of slots (113) are spaced apart on the outer circumference of the lamination body (111), and the plurality of slots (113) form radial openings on the outer circumference of the lamination body (111); the number of slots (113) is equal to the number of rotor slots (112), each slot (113) corresponds to one rotor slot (112), and the center line of each slot (113) coincides with the center line of the corresponding rotor slot (112); a partition is formed between the slots (113) and the rotor slots (112) in the radial direction of the lamination body (111).

2. The rotor lamination according to claim 1, characterized in that, Along the radial direction of the lamination body (111), the first arc segment (121) is disposed inside the second arc segment (122), and the radius of curvature of the first arc segment (121) is smaller than the radius of curvature of the second arc segment (122).

3. The rotor lamination according to claim 2, characterized in that, The first arc segment (121) and the second arc segment (122) are respectively connected on both sides by two straight lines with a gradually decreasing distance in the radial direction, and the straight lines of any two adjacent rotor slots (112) are parallel to each other.

4. The rotor lamination according to claim 1, characterized in that, At the centerline of the rotor slot (112), the width of the partition is greater than or equal to 0.4 mm.

5. The rotor lamination according to claim 4, characterized in that, In the radial direction of the stamping body (111), the depth of the slot (113) is 2 mm to 3 mm; in the circumferential direction of the stamping body (111), the width of the slot (113) is 2 mm to 4 mm.

6. The rotor lamination according to any one of claims 1 to 5, characterized in that, It also includes a plurality of ventilation slots (114) spaced circumferentially on the lamination body (111), wherein the ventilation slots (114) are arranged radially on the lamination body (111) between the lamination shaft hole (115) and the rotor slot (112).

7. The rotor lamination according to claim 6, characterized in that, The number of the plurality of ventilation slots (114) is less than the number of the plurality of rotor slots (112); the ventilation slots (114) have a trapezoidal profile shape, the top edge of the ventilation slots (114) faces the lamination shaft hole (115), the bottom edge of the ventilation slots (114) faces the rotor slots (112), and the length of the bottom edge is greater than the length of the top edge.

8. A cast aluminum rotor, characterized in that, include: The rotor core (11) is formed by overlapping and aligning multiple rotor laminations along the axial direction and rotating angles along the axial direction of the rotor core (11); along the axial direction of the rotor core (11), the lamination shaft holes (115) of the multiple rotor laminations are aligned and overlapped to form shaft assembly holes, the corresponding rotor slots (112) of the multiple rotor laminations are aligned and overlapped to form multiple guide bar receiving slots, and the corresponding slots (113) of the multiple rotor laminations are aligned and overlapped to form multiple channels; Cast aluminum guide strips (13), the number of which is equal to the number of guide strip receiving slots, and the cast aluminum guide strips (13) are filled in the corresponding guide strip receiving slots; A rotating shaft (14) is assembled in the shaft assembly hole, and a torque transmission structure is provided between the mating surfaces of the rotating shaft (14) and the shaft assembly hole.

9. The cast aluminum rotor according to claim 8, characterized in that, Also includes: Balance ring assembly (15), the balance ring assembly (15) is disposed on the rotating shaft (14) and located at the first axial end of the rotor core (11); An internal fan assembly (16) is disposed on the rotating shaft (14) at the second axial end of the rotor core (11).

10. A rotary electric motor, characterized in that, The device includes a cast aluminum rotor (1), a stator assembly (2), and a motor body (3) as described in claim 8 or 9, wherein the stator assembly (2) is installed inside the motor body (3), and the cast aluminum rotor (1) is coaxially disposed inside the stator assembly (2).

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