Motor rotor structure

Abstract

The utility model provides a motor rotor structure, which comprises a rotating shaft (1) and is characterized in that a rotor support (2) is fixedly sleeved on the periphery of the rotating shaft (1), balance plates (3) are fixedly arranged on two sides of the rotor support (2), and a rotor iron core assembly (4) is fixedly accommodated on the periphery of the rotor support (2) and between the balance plates (3) on the two sides; the rotor support is arranged between the rotor core assembly and the motor rotating shaft, on one hand, the rotor support can serve as an oil channel to cool the rotor core assembly, and on the other hand, cooling oil can be effectively prevented from entering the space between rotor core layers, so that the possibility that eddy current is generated due to the influence of the cooling oil on electromagnetic induction is reduced; the risk that the overall efficiency of the motor is reduced is further reduced; the rotor adopts a compact structure design, so that the rotor can be more easily integrated into application in a limited space, and the overall compactness of the system is improved; the rotor core assembly and the stator winding structure can be cooled at the same time, and the heat dissipation capability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy vehicle drive motor technology, and specifically relates to a motor rotor structure. Background Art

[0002] With the continuous development of new energy vehicle drive motor technology, drive motor technology is gradually developing towards achieving higher torque and power density, which is closely related to the heat dissipation method of the motor. Efficient heat dissipation technology can not only improve the motor's climbing and endurance capabilities, but also increase the motor's rated power and density without increasing the motor's effective mass.

[0003] Traditional automotive motors mostly use water cooling, in which the heat source is in indirect contact with the cooling system, the heat transfer path is long, and the heat dissipation efficiency is low. Compared with water-cooled motors, oil-cooled motors have direct contact between the cooling oil and the heat source, which can effectively absorb and transfer the heat generated by the drive motor when it is working, greatly improving the stability of the motor under high load operation.

[0004] In the oil-cooled motors of the prior art, on the one hand, there is a possibility that the cooling oil will penetrate into the layers of the rotor core during cooling, thereby generating eddy currents due to the influence of the oil on electromagnetic induction, thereby reducing the overall efficiency of the motor; on the other hand, the existing rotor structure occupies a large amount of space; in addition, the existing oil-cooled motors have insufficient heat dissipation capacity and cannot simultaneously take into account the cooling of the rotor core assembly and the stator winding structure.

[0005] As one of the core components of the motor, the rotor assembly has a reasonable structural design and unique heat dissipation method that directly affects the performance of the motor. Therefore, it is necessary to provide a motor rotor structure that can effectively absorb and transfer the heat generated by the rotor so that it can maintain more excellent motor performance in a wider operating temperature range. Utility Model Content

[0006] In order to solve the defects and shortcomings in the prior art, the utility model provides a motor rotor structure.

[0007] The technical solution provided by the utility model is as follows:

[0008] A motor rotor structure includes a rotating shaft, characterized in that a rotor bracket is fixedly sleeved on the outer periphery of the rotating shaft, balancing plates are fixedly arranged on both sides of the rotor bracket, and a rotor core assembly is fixedly accommodated on the outer periphery of the rotor bracket and between the balancing plates on both sides.

[0009] As a further preferred embodiment of the utility model, a first oil-slinging hole communicating with the rear end bearing chamber is formed at the rear end of the rotating shaft, and a second oil-slinging hole communicating with the front end bearing chamber is formed at the front end of the rotating shaft.

[0010] As a further preferred embodiment of the utility model, a third oil-flinging hole connected to the inner contour of the stator winding output end is opened at the rear end of the rotating shaft, and a fourth oil-flinging hole connected to the inner contour of the stator winding non-output end is opened at the front end of the rotating shaft, and the third oil-flinging hole is located in front of the first oil-flinging hole, and the fourth oil-flinging hole is located in front of the second oil-flinging hole.

[0011] As a further preferred embodiment of the present utility model, a fifth oil-swinging hole communicating with the interior of the rotor bracket is opened in the middle of the rotating shaft.

[0012] As a further preferred embodiment of the present utility model, a radial oil channel hole communicating with the fifth oil-slinging hole is opened inside the rotor bracket.

[0013] As a further preferred embodiment of the present invention, a plurality of weight-reducing grooves are evenly provided at both ends of the rotor bracket along the radial direction, and the weight-reducing grooves are connected to the interior of the balance plate.

[0014] As a further preferred embodiment of the present invention, an annular oil groove communicating with the weight-reducing groove is provided inside the balancing plate.

[0015] As a further preferred embodiment of the utility model, an outer edge of the annular oil groove is provided with an oblique oil hole, and two ends of the oblique oil hole are respectively connected to the weight reduction groove and the inner contour of the non-outlet end of the stator winding.

[0016] As a further preferred embodiment of the utility model, a first oil deflector ring communicating with the first oil-slinging hole is provided at the rear end of the inner cavity of the rotating shaft, and a second oil deflector ring communicating with the second oil-slinging hole is provided at the front end of the inner cavity of the rotating shaft.

[0017] As a further preferred embodiment of the present invention, an axial oil hole and a radial oil hole are respectively provided inside the first oil deflector ring and the second oil deflector ring.

[0018] Compared with the prior art, the beneficial effects achieved by the utility model include:

[0019] 1) The utility model provides a motor rotor structure, wherein a rotor bracket is provided between the rotor core assembly and the motor shaft, which can serve as an oil passage to cool the rotor core assembly, and can effectively prevent cooling oil from penetrating into the rotor core layers, thereby reducing the possibility of eddy currents generated by the influence of cooling oil on electromagnetic induction, thereby further reducing the risk of decreased overall efficiency of the motor.

[0020] 2) The utility model provides a motor rotor structure, which adopts a compact structure design to make it easier to integrate into applications with limited space, thereby improving the overall compactness of the system.

[0021] 3) The utility model provides a motor rotor structure that can cool both the rotor core assembly and the stator winding structure at the same time, and has a strong heat dissipation capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural side view of the motor rotor structure provided by the utility model.

[0023] Figure 2 This is a structural front view of the motor rotor structure provided by the utility model.

[0024] Figure 3 This is a side sectional view of the motor rotor structure provided by the utility model.

[0025] Figure 4 This is a structural schematic diagram of the rotating shaft provided by the utility model.

[0026] Figure 5 This is a structural schematic diagram of the rotor bracket provided by the utility model.

[0027] Figure 6 This is a structural schematic diagram of the balance board provided by the utility model.

[0028] Figure 7 This is a structural schematic diagram of the oil retaining ring provided by the utility model. DETAILED DESCRIPTION

[0029] 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 in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] [First embodiment]

[0033] like Figure 1-7 The figure shows a motor rotor structure provided by the first embodiment of the utility model, including a rotating shaft 1, which is fixedly connected to the motor output shaft, or the motor output shaft is directly selected, and a rotor bracket 2 is fixedly sleeved on the outer periphery of the rotating shaft 1, and a balancing plate 3 is fixedly arranged on both sides of the rotor bracket 2, and a rotor core assembly 4 is fixedly accommodated on the outer periphery of the rotor bracket 2 and between the balancing plates 3 on both sides, and a rotor bracket is arranged between the rotor core assembly and the motor rotating shaft. On the one hand, the rotor core assembly can be cooled by arranging an oil channel inside the rotor bracket 2, and on the other hand, the cooling oil can be effectively prevented from penetrating into the rotor core layers, thereby reducing the possibility of eddy currents generated due to the influence of the cooling oil on electromagnetic induction, thereby further reducing the risk of a decrease in the overall efficiency of the motor.

[0034] In this embodiment, a keyway 22 is provided in the axial direction of the rotor bracket 2 so as to be fixedly sleeved on the outer periphery of the rotating shaft 1 by means of a key connection; the balancing plate 3 can be fixedly connected to the rotor bracket 2 by means of external fixings such as bolts or nuts passing through the fixing holes 23, or the balancing plate 3 and the rotor bracket 2 can be fixedly connected to the rotor bracket 2 by means of being set as one body. Preferably, in this embodiment, the rear side of the rotor bracket 2 and the balancing plate 3 are formed into an integral structure, while the front side of the rotor bracket 2 and the balancing plate 3 are fixed by means of external fixings. In this case, the rear balancing plate (not removable) is a static balancing plate, and the front balancing plate (removable) is a dynamic balancing plate.

[0035] like Figure 3-4 As shown, in this embodiment, a first oil-fling hole 11 communicating with the rear end bearing chamber is opened at the rear end of the rotating shaft 1, and a second oil-fling hole 12 communicating with the front end bearing chamber is opened at the front end of the rotating shaft 1, so as to cool the rear end bearing chamber through the first oil-fling hole 11 and cool the front end bearing chamber through the second oil-fling hole 12.

[0036] A third oil-slinging hole 13 connected to the inner contour of the stator winding outlet end is provided at the rear end of the rotating shaft 1, and a fourth oil-slinging hole 14 connected to the inner contour of the stator winding non-outlet end is provided at the front end of the rotating shaft 1. The third oil-slinging hole 13 is located in front of the first oil-slinging hole 11, and the fourth oil-slinging hole 14 is located in front of the second oil-slinging hole 12, so that the inner contour of the stator winding outlet end is cooled through the third oil-slinging hole 13, and the inner contour of the stator winding non-outlet end is cooled through the fourth oil-slinging hole 14.

[0037] A fifth oil-swinging hole 15 connected to the inside of the rotor support 2 is also opened in the middle of the rotating shaft 1. Correspondingly, a radial oil channel hole (not shown) connected to the fifth oil-swinging hole 15 is opened inside the rotor support 2, so that cooling oil can be thrown into the radial oil channel hole of the rotor support 2 through the fifth oil-swinging hole 15 to achieve cooling of the rotor core assembly 4.

[0038] like Figure 5-6 As shown, a plurality of weight-reducing grooves 21 are uniformly provided in the radial direction at both ends of the rotor support 2, and the weight-reducing grooves 21 are connected to the interior of the balancing plate 3; correspondingly, an annular oil groove 31 connected to the weight-reducing groove 21 is provided inside the balancing plate 3, and the weight-reducing groove 21 not only reduces weight, but also forms an axial oil passage together with the annular oil groove 31 connected thereto, so that the cooling oil after cooling the rotor core assembly 4 can contact the inner contour of the non-outlet end of the stator winding through the axial oil passage, thereby cooling the inner contour of the non-outlet end of the stator winding.

[0039] As a preference, Figure 6 As shown, an oblique oil hole 32 is opened on the outer edge of the annular oil groove 31, and both ends of the oblique oil hole 32 are respectively connected with the weight reduction groove 21 and the inner contour of the non-outlet end of the stator winding. The cooling oil in the annular oil groove 31 can be thrown into contact with the inner contour of the non-outlet end of the stator winding through the oblique oil hole 32, thereby realizing cooling of the inner contour of the non-outlet end of the stator winding.

[0040] The unique rotor support structure of this embodiment greatly shortens the overall dimensions of the rotor, making the overall structure more compact.

[0041] like Figure 3 As shown, a first oil deflector ring 5 communicating with the first oil-slinging hole 11 is provided at the rear end of the inner cavity of the rotating shaft 1, and a second oil deflector ring 6 communicating with the second oil-slinging hole 12 is provided at the front end of the inner cavity of the rotating shaft 1; as a preferred embodiment, Figure 7 As shown, in this embodiment, the first oil deflector ring 5 and the second oil deflector ring 6 are respectively provided with an axial oil through hole 51 and a radial oil through hole 52 inside.

[0042] The arrangement of the first oil retaining ring 5 at the rear end can, on the one hand, facilitate the accumulation of a part of the oil in the inner cavity of the rotating shaft 1 through the axial oil through hole 51 (for example, it is set to a small aperture), and on the other hand, facilitate the cooling of the rear end bearing chamber through the radial oil through hole 52 (for example, it is set to a large aperture) in cooperation with the first oil throwing hole 11, thereby effectively suppressing the backflow phenomenon caused by excessive accumulation of cooling oil in the inner cavity of the rotating shaft;

[0043] The setting of the second oil retaining ring 6 at the front end can cool the front end bearing chamber through the radial oil hole 52 and the second oil throwing hole 12, and can also control the amount of oil for cooling the front bearing chamber and the inner contour of the non-outlet end of the front end stator winding through its axial oil hole 51.

[0044] The specific cooling process is as follows: the cooling oil entering the inner cavity of the rotating shaft 1:

[0045] A part of the oil cools the rear end bearing chamber through the first oil-slinging hole 11, and cools the front end bearing chamber through the second oil-slinging hole 12;

[0046] The other part realizes cooling of the inner contour of the stator winding outlet end through the third oil-slinging hole 13, and realizes cooling of the inner contour of the stator winding non-outlet end through the fourth oil-slinging hole 14;

[0047] In addition, the remaining cooling oil is transferred to the radial oil channel hole in the inner cavity of the rotor bracket 2 through the fifth oil-slinging hole 15, and then absorbs and transfers the heat generated by the rotor core assembly segment in the process of entering the axial oil channel through the radial oil channel hole, and then the cooling oil is slung to the inner contour of the non-outlet end of the winding through the oblique oil port on the balance plate, thereby cooling the inner contour of the non-outlet end of the stator winding;

[0048] After the cooling oil is sprayed and thrown on the stator and rotor parts for cooling, the heat-absorbing cooling oil is transferred from the heat source to the cooling device through the cooling circulation system in the motor, and then flows back to the inside of the motor, forming a closed-loop circulation, thereby achieving effective heat discharge.

[0049] The motor rotor structure enables the motor to maintain a stable temperature under high-efficiency and high-load operating conditions, thereby improving the performance and life of the motor.

[0050] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A motor rotor structure, comprising a rotating shaft (1), characterized in that: A rotor bracket (2) is fixedly sleeved on the outer periphery of the rotating shaft (1), balancing plates (3) are fixedly arranged on both sides of the rotor bracket (2), and a rotor core assembly (4) is fixedly accommodated on the outer periphery of the rotor bracket (2) and between the balancing plates (3) on both sides.

2. A motor rotor structure according to claim 1, characterized in that: The rear end of the rotating shaft (1) is provided with a first oil-slinging hole (11) communicating with the rear end bearing chamber, and the front end of the rotating shaft (1) is provided with a second oil-slinging hole (12) communicating with the front end bearing chamber.

3. A motor rotor structure according to claim 2, characterized in that: A third oil-spinning hole (13) communicating with the inner contour of the stator winding outlet end is formed at the rear end of the rotating shaft (1), and a fourth oil-spinning hole (14) communicating with the inner contour of the stator winding non-outlet end is formed at the front end of the rotating shaft (1), wherein the third oil-spinning hole (13) is located in front of the first oil-spinning hole (11), and the fourth oil-spinning hole (14) is located in front of the second oil-spinning hole (12).

4. The motor rotor structure according to claim 3, characterized in that: A fifth oil-spinning hole (15) is provided in the middle of the rotating shaft (1) and is communicated with the interior of the rotor support (2).

5. The motor rotor structure according to claim 4, characterized in that: A radial oil channel hole communicating with the fifth oil-slinging hole (15) is provided inside the rotor support (2).

6. The motor rotor structure according to claim 5, characterized in that: A plurality of weight-reducing grooves (21) are evenly provided at both ends of the rotor support (2) in a radial direction, and the weight-reducing grooves (21) are in communication with the interior of the balancing plate (3).

7. The motor rotor structure according to claim 6, characterized in that: An annular oil groove (31) communicating with the weight-reducing groove (21) is provided inside the balancing plate (3).

8. The motor rotor structure according to claim 7, characterized in that: An oblique oil hole (32) is formed at the outer edge of the annular oil groove (31), and two ends of the oblique oil hole (32) are respectively connected to the weight-reducing groove (21) and the inner contour of the non-outlet end of the stator winding.

9. The motor rotor structure according to claim 2, characterized in that: A first oil deflector ring (5) communicating with the first oil deflector hole (11) is provided at the rear end of the inner cavity of the rotating shaft (1), and a second oil deflector ring (6) communicating with the second oil deflector hole (12) is provided at the front end of the inner cavity of the rotating shaft (1).

10. The motor rotor structure according to claim 9, characterized in that: An axial oil through hole (51) and a radial oil through hole (52) are respectively provided inside the first oil deflector ring (5) and the second oil deflector ring (6).

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