Rotor core, motor and vehicle

Abstract

The utility model discloses a rotor core, a motor and a vehicle, the peripheral surface of the rotor core is provided with a rotor groove, the rotor core is at least provided with a first heat dissipation structure and a second heat dissipation structure, the first heat dissipation structure comprises a plurality of first heat dissipation holes arranged along a first circumference array, and the second heat dissipation structure comprises a plurality of second heat dissipation holes arranged along a second circumference array. The second heat dissipation structure comprises a plurality of second heat dissipation holes arranged along a second circumference array, the first circumference, the second circumference and the rotor core are concentrically arranged, and the diameters of the first circumference and the second circumference are different. According to the technical scheme of the utility model, the technical problem that the existing rotor heat dissipation structure is poor in heat dissipation effect is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotors, and in particular to a rotor core, a motor and a vehicle. Background Art

[0002] The motor is a device that converts electrical energy into mechanical energy. It is widely used in new energy vehicles, rail transit and other fields as a core driving component. The motor is usually powered by an inverter, which has large power supply harmonics, resulting in large losses in the motor rotor and rapid temperature rise, which has an adverse effect on the motor bearings. For this reason, the motor rotor needs to be cooled in time. However, the existing rotor heat dissipation structure has a poor heat dissipation effect, and the heat is easily transferred to the bearing position of the shaft, which causes the bearing temperature to rise too much. Utility Model Content

[0003] The main purpose of the utility model is to provide a rotor core, a motor and a vehicle, aiming to solve the technical problem that the existing rotor heat dissipation structure has a poor heat dissipation effect.

[0004] To achieve the above-mentioned purpose, an embodiment of the utility model proposes a rotor core, wherein the outer circumferential surface of the rotor core is provided with rotor slots, and at least a first heat dissipation structure and a second heat dissipation structure are provided on the rotor core, wherein the first heat dissipation structure includes a plurality of first heat dissipation holes arranged along a first circumferential array, and the second heat dissipation structure includes a plurality of second heat dissipation holes arranged along a second circumferential array, wherein the first circumference, the second circumference and the rotor core are concentrically arranged, and the diameters of the first circumference and the second circumference are different.

[0005] Optionally, in an embodiment of the present invention, the second circumference is located outside the first circumference, and the opening area of ​​the first heat dissipation hole is larger than the opening area of ​​the second heat dissipation hole.

[0006] Optionally, in one embodiment of the utility model, the second heat dissipation hole has a first side wall and a second side wall connected, the second side wall is arranged away from the rotor slot, and the first side wall is arranged toward the rotor slot; wherein, the first side wall is arranged parallel to the bottom of the rotor slot, and the second side wall is arc-shaped.

[0007] Optionally, in an embodiment of the present invention, each of the rotor slots is correspondingly provided with a second heat dissipation hole.

[0008] Optionally, in one embodiment of the utility model, a third heat dissipation structure is also provided on the rotor core, and the third heat dissipation structure includes a plurality of third heat dissipation holes arranged along a third circumferential array, wherein the first circumference is located outside the second circumference, and the third circumference is located between the first circumference and the second circumference.

[0009] Optionally, in an embodiment of the present utility model, at least one third heat dissipation hole is provided between two adjacent first heat dissipation holes.

[0010] Optionally, in an embodiment of the present invention, the opening area of ​​the first heat dissipation hole is larger than the opening area of ​​the second heat dissipation hole, the opening area of ​​the third heat dissipation hole is larger than the opening area of ​​the second heat dissipation hole, and the opening area of ​​the third heat dissipation hole is smaller than the opening area of ​​the first heat dissipation hole.

[0011] Optionally, in an embodiment of the present utility model, the first heat dissipation hole, the second heat dissipation hole and the rotor slot are arranged opposite to each other in the radial direction of the rotor core.

[0012] To achieve the above objectives, an embodiment of the utility model provides a motor, which includes a stator and a rotor core rotatably disposed inside the stator, and the rotor core includes the rotor core described above.

[0013] To achieve the above objectives, an embodiment of the utility model provides a vehicle, which includes wheels and a motor drivingly connected to the wheels, wherein the motor is used to provide driving force for the wheels, and the motor is the motor described above.

[0014] Compared with the prior art, in a technical solution proposed by the utility model, the first heat dissipation hole and the second heat dissipation hole are provided to allow air to flow. During the flow, the air takes away the surface heat of the guide bar in the rotor slot, thereby achieving heat dissipation and cooling of the guide bar, preventing heat from being conducted from the guide bar toward the center of the rotor core, thereby reducing the heat conducted to the shaft bearing, thereby slowing down the temperature rise of the shaft bearing, effectively reducing the operating temperature of the shaft bearing, and extending the service life of the shaft bearing. Moreover, the first heat dissipation structure and the second heat dissipation structure are arranged in sequence in the radial direction of the rotor core, which is equivalent to setting a two-stage heat dissipation structure between the rotor slot and the shaft bearing. The two-stage heat dissipation structure can effectively reduce the heat transmitted to the shaft bearing, thereby improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of an embodiment of the rotor core of the utility model;

[0017] Figure 2It is a structural schematic diagram of another embodiment of the rotor core of the utility model.

[0018] Description of Figure Numbers:

[0019] 10 (10'), rotor core; 11 (11'), rotor slot; 20 (20'), first heat dissipation hole; 30 (30'), second heat dissipation hole; 40, third heat dissipation hole.

[0020] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the utility model.

[0022] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present utility model.

[0026] The power supply of the motor is usually powered by a converter, which has large power supply harmonics, resulting in large losses in the motor rotor and rapid temperature rise, which has an adverse effect on the motor bearings. Therefore, it is necessary to dissipate the heat of the motor rotor in time. However, the existing rotor heat dissipation structure has a poor heat dissipation effect, and the heat is easily transferred to the bearing position of the shaft, which in turn causes excessive bearing temperature rise.

[0027] In view of this, an embodiment of the utility model provides a rotor core, a motor and a vehicle, wherein a first heat dissipation structure and a second heat dissipation structure are arranged sequentially in the radial direction of the rotor core, which is equivalent to providing a two-stage heat dissipation structure between the rotor slot and the shaft bearing. The two-stage heat dissipation structure can effectively reduce the heat transmitted to the shaft bearing, thereby improving the heat dissipation effect.

[0028] In order to better understand the above technical solution, the above technical solution is described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 and Figure 2 As shown, an embodiment of the utility model proposes a rotor core 10, the outer circumferential surface of the rotor core 10 is provided with a rotor slot 11, and the rotor core 10 is provided with at least a first heat dissipation structure and a second heat dissipation structure, the first heat dissipation structure includes a plurality of first heat dissipation holes 20 arranged along a first circumferential array, and the second heat dissipation structure includes a plurality of second heat dissipation holes 30 arranged along a second circumferential array, wherein the first circumference, the second circumference and the rotor core 10 are concentrically arranged, and the diameters of the first circumference and the second circumference are different.

[0030] In the technical solution adopted in this embodiment, the first heat dissipation hole 20 and the second heat dissipation hole 30 are provided to allow air to flow. During the flow, the air takes away the surface heat of the guide bar in the rotor slot 11, thereby achieving heat dissipation and cooling of the guide bar, preventing heat from being conducted from the guide bar toward the center of the rotor core 10, thereby reducing the heat conducted to the shaft bearing, thereby slowing down the temperature rise of the shaft bearing, effectively reducing the operating temperature of the shaft bearing, and extending the service life of the shaft bearing. Moreover, the first heat dissipation structure and the second heat dissipation structure are arranged in sequence in the radial direction of the rotor core 10, which is equivalent to setting a two-stage heat dissipation structure between the rotor slot 11 and the shaft bearing. The two-stage heat dissipation structure can effectively reduce the heat transmitted to the shaft bearing, thereby improving the heat dissipation effect.

[0031] In one embodiment, the opening areas of the plurality of first heat dissipation holes 20 arranged along the first circumference are different; and / or the opening areas of the plurality of second heat dissipation holes 30 arranged along the second circumference are different. In this way, the effective ventilation area can be appropriately increased on the basis of taking into account the strength of the rotor core 10, thereby further improving the heat dissipation effect.

[0032] In another embodiment, the opening areas of the plurality of first heat dissipation holes 20 arranged along the first circumference are different, and the opening areas of the second heat dissipation holes 30 arranged along the second circumference are different, wherein the opening areas of the first heat dissipation holes 20 and the second heat dissipation holes 30 arranged relatively to each other in the radial direction of the rotor core 10 are different. This can prevent the radial opening area of ​​the rotor core 10 from being too large to affect the strength of the rotor core 10, while also ensuring the ventilation and heat dissipation effect.

[0033] As an optional manner, the shape of the first heat dissipation hole 20 and / or the second heat dissipation hole 30 can be a round hole, a square hole or an irregular hole, which is not limited here.

[0034] For example, refer to Figure 1 In one embodiment of the utility model, the second circumference is located outside the first circumference, so that the second heat dissipation hole 30 is arranged close to the slot bottom of the rotor slot 11, and the opening area of ​​the first heat dissipation hole 20 is larger than the opening area of ​​the second heat dissipation hole 30. Specifically, the first heat dissipation hole 20 is farther away from the rotor slot 11 than the second heat dissipation hole 30, and also avoids the magnetic circuit position. The larger opening area of ​​the first heat dissipation hole 20 can allow more cooling medium to flow through, and can take away more heat, further improving the heat dissipation effect.

[0035] For example, refer to Figure 1 In one embodiment of the utility model, the second heat dissipation hole 30 has a first side wall and a second side wall connected to each other, the second side wall is arranged away from the rotor slot 11, and the first side wall is arranged toward the rotor slot 11; wherein the first side wall is arranged parallel to the bottom of the rotor slot 11, and the second side wall is in an arc shape.

[0036] Specifically, the second heat dissipation hole 30 is arranged close to the bottom of the rotor slot 11, and closer to the guide bar in the rotor slot 11, so that the heat generated by the guide bar can be taken away in time through the cooling medium (cold air or coolant), thereby reducing the heat transmitted to the shaft bearing. There will be a magnetic circuit near the rotor slot 11, and a too large opening area of ​​the second heat dissipation hole 30 will affect the magnetic circuit. For this reason, the first side wall of the second heat dissipation hole 30 is arranged parallel to the bottom of the rotor slot 11, and the second side wall is in an arc shape, which is conducive to reducing the flow resistance of the air and the adverse effect on the magnetic circuit, while taking into account the structural strength, and avoiding affecting the mechanical strength of the rotor due to an overly large opening.

[0037] For example, refer to Figure 1In one embodiment of the utility model, each rotor slot 11 is provided with a corresponding second heat dissipation hole 30. In this way, the guide bars in each rotor slot 11 can be cooled separately, and multiple rotor slots 11 are prevented from sharing one second heat dissipation hole 30 to dissipate heat, resulting in poor heat dissipation effect.

[0038] For example, refer to Figure 2 In one embodiment of the utility model, a third heat dissipation structure is provided on the rotor core 10', and the third heat dissipation structure includes at least two third heat dissipation holes 40 arranged along a third circumferential array, wherein the first circumference is located outside the second circumference, and the third circumference is located between the first circumference and the second circumference.

[0039] It can be understood that by arranging the first heat dissipation structure, the third heat dissipation structure and the second heat dissipation structure in sequence in the radial direction of the rotor core 10', it is equivalent to setting a three-level heat dissipation structure between the rotor slot and the shaft bearing. The three-level heat dissipation structure can effectively reduce the heat transmitted to the shaft bearing, thereby improving the heat dissipation effect.

[0040] For example, refer to Figure 2 In one embodiment of the present invention, at least one third heat dissipation hole 40 is provided between two adjacent first heat dissipation holes 20'. In this way, the radial thermal resistance between the first heat dissipation hole 20' and the second heat dissipation hole 30' can be increased, which is more conducive to heat dissipation.

[0041] For example, refer to Figure 2 In one embodiment of the utility model, the opening area of ​​the first heat dissipation hole 20' is larger than the opening area of ​​the second heat dissipation hole 30', the opening area of ​​the third heat dissipation hole 40 is larger than the opening area of ​​the second heat dissipation hole 30', and the opening area of ​​the third heat dissipation hole 40 is smaller than the opening area of ​​the first heat dissipation hole 20'. In this way, the effective ventilation area can be appropriately increased on the basis of taking into account the strength of the rotor core 10', and the heat dissipation effect can be further improved. Specifically, by setting the first heat dissipation hole 20', the second heat dissipation hole 30' and the third heat dissipation hole 40, the heat transfer path can be increased, the radial thermal resistance can be effectively increased, and the difficulty of heat transfer to the shaft bearing can be increased, thereby more effectively slowing down the temperature rise of the shaft bearing. Moreover, the second heat dissipation hole 30' and the third heat dissipation hole 40 are closer to the shaft bearing, and the opening area of ​​the first heat dissipation hole 20', the opening area of ​​the third heat dissipation hole 40 and the opening area of ​​the second heat dissipation hole 30' are decreasing, which can improve the structural strength of the rotor core 10' near the shaft bearing position, and then on the basis of meeting the structural strength, the heat dissipation effect can be improved as much as possible.

[0042] For example, refer to Figure 2In one embodiment of the utility model, the first heat dissipation hole 20', the second heat dissipation hole 30' and the rotor slot 11' are arranged opposite to each other in the radial direction of the rotor core 10'. The rotor slot 11' is the main heat conduction path along the radial direction of the rotor core 10' and is also the path closest to the shaft. The first heat dissipation hole 20', the second heat dissipation hole 30' and the rotor slot 11' are arranged opposite to each other in the radial direction of the rotor core 10', which can dissipate heat in time on the heat transfer path, and the heat is less likely to be transferred to the shaft.

[0043] To sum up, the utility model provides a rotor core 10, in which the first heat dissipation structure and the second heat dissipation structure are arranged sequentially in the radial direction of the rotor core, which is equivalent to setting a two-stage heat dissipation structure between the rotor slot and the shaft bearing. The two-stage heat dissipation structure can effectively reduce the heat transmitted to the shaft bearing, thereby improving the heat dissipation effect.

[0044] When the second heat dissipation structure is located outside the first heat dissipation structure, the second heat dissipation hole 30 is arranged close to the rotor slot 11. At this time, the opening area of ​​the first heat dissipation hole 20 is larger than the opening area of ​​the second heat dissipation hole 30. The first side wall of the second heat dissipation hole 30 is arranged parallel to the slot bottom of the rotor slot 11. The second side wall of the second heat dissipation hole 30 is arc-shaped, which can help reduce the flow resistance of the air and the adverse effect on the magnetic circuit, while taking into account the structural strength, avoiding affecting the mechanical strength of the rotor due to excessive openings. At the same time, at a position far away from the magnetic circuit, the larger opening area of ​​the first heat dissipation hole 20 can allow more cooling medium to flow through, can take away more heat, and further improve the heat dissipation effect.

[0045] When the first heat dissipation structure is located outside the second heat dissipation structure, a third heat dissipation structure is also arranged between the first heat dissipation structure and the second heat dissipation structure. The three-stage heat dissipation structure arranged along the radial direction of the rotor core 10' can effectively reduce the heat transmitted to the shaft bearing, thereby improving the heat dissipation effect. At this time, the opening area of ​​the first heat dissipation hole 20', the opening area of ​​the third heat dissipation hole 40, and the opening area of ​​the second heat dissipation hole 30' are decreasing, which can improve the structural strength of the rotor core 10' near the shaft bearing, and the heat dissipation near the rotor slot 11' is better, thereby improving the heat dissipation effect as much as possible on the basis of meeting the structural strength.

[0046] To achieve the above purpose, the embodiment of the utility model provides a motor, the motor includes a stator and a rotor core rotatably arranged inside the stator, and the rotor core is the rotor core described above. Specifically, the specific structure of the rotor core refers to the above embodiment. Since the motor adopts all the technical solutions of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here one by one.

[0047] To achieve the above purpose, the embodiment of the utility model provides a vehicle, the vehicle includes wheels and a motor drivingly connected to the wheels, the motor is used to provide driving force for the wheels, and the motor is the motor described above. Specifically, the specific structure of the motor refers to the above embodiment. Since the vehicle adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here one by one.

[0048] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the embodiment of the present invention. All equivalent structural changes made by using the description and drawings of the embodiment of the present invention under the inventive concept of the embodiment of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the embodiment of the present invention.

Claims

1. A rotor core, characterized in that: The outer circumferential surface of the rotor core is provided with rotor slots, and the rotor core is provided with at least a first heat dissipation structure and a second heat dissipation structure, the first heat dissipation structure includes a plurality of first heat dissipation holes arranged along a first circumferential array, and the second heat dissipation structure includes a plurality of second heat dissipation holes arranged along a second circumferential array, wherein the first circumference, the second circumference and the rotor core are concentrically arranged, and the diameters of the first circumference and the second circumference are different.

2. The rotor core according to claim 1, characterized in that: The second circumference is located outside the first circumference, and the opening area of ​​the first heat dissipation hole is larger than the opening area of ​​the second heat dissipation hole.

3. The rotor core according to claim 2, characterized in that: The second heat dissipation hole has a first side wall and a second side wall connected to each other, the second side wall is arranged away from the rotor slot, and the first side wall is arranged toward the rotor slot; wherein the first side wall is arranged parallel to the bottom of the rotor slot, and the second side wall is in an arc shape.

4. The rotor core according to claim 2, characterized in that: Each of the rotor slots is correspondingly provided with a second heat dissipation hole.

5. The rotor core according to claim 1, characterized in that: The rotor core is also provided with a third heat dissipation structure, and the third heat dissipation structure includes a plurality of third heat dissipation holes arranged in a third circumferential array; The first circumference is located outside the second circumference, and the third circumference is located between the first circumference and the second circumference.

6. The rotor core according to claim 5, characterized in that: At least one third heat dissipation hole is provided between two adjacent first heat dissipation holes.

7. The rotor core according to claim 6, characterized in that: The opening area of ​​the first heat dissipation hole is larger than the opening area of ​​the second heat dissipation hole, the opening area of ​​the third heat dissipation hole is larger than the opening area of ​​the second heat dissipation hole, and the opening area of ​​the third heat dissipation hole is smaller than the opening area of ​​the first heat dissipation hole.

8. The rotor core according to claim 7, characterized in that: The first heat dissipation hole, the second heat dissipation hole and the rotor slot are arranged opposite to each other in the radial direction of the rotor core.

9. A motor, characterized in that: The motor includes a stator and a rotor core rotatably arranged inside the stator, and the rotor core includes the rotor core according to any one of claims 1-8.

10. A vehicle, characterized in that: The vehicle comprises wheels and a motor drivingly connected to the wheels, the motor being used to provide driving force for the wheels, and the motor comprises the motor as claimed in claim 9.

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