Rotor oil cooling structure of high-speed flat wire motor

Abstract

The utility model discloses a high speed flat wire motor rotor oil cooling structure comprising a main shaft and a rotor body, the front part of the rotor body is provided with a front cover plate, the rear part of the rotor body is provided with a rear cover plate, the rotary transformer end of the main shaft is provided with a hollow oil injection channel, and the rotary transformer end of the main shaft is provided with an oil outlet. An oil injection channel is formed in the rotor body, four first oil injection holes are formed in the front portion of the side wall of the oil injection channel, four second oil injection holes are formed in the middle of the side wall of the oil injection channel, eight through cooling channels are formed in the rotor body, four front oil outlet holes are formed in the front cover plate, and four rear oil outlet holes are formed in the rear cover plate. According to the rotor oil cooling structure of the high-speed flat wire motor, the staggered cooling channels in the rotor body and the turbulent flow steps in the cooling channels are utilized, so that oil can form turbulent flow, a laminar flow structure is damaged and more heat is taken away more easily at a high rotating speed, the heat dissipation effect is obvious, the temperature of magnetic steel is effectively reduced, demagnetization at a high temperature is avoided, and the service life of the rotor is prolonged. And higher efficiency and performance of the motor are ensured.

Description

Technical Field

[0001] This utility model relates to an electric motor, and more specifically, to an oil-cooled rotor structure for a high-speed flat wire motor. Background Technology

[0002] With the widespread adoption of electrification in the construction machinery market, permanent magnet synchronous motors are now the most common drive solutions. To meet the demands of construction machinery customers for low-speed, high-torque and high-speed, high-torque applications, motor manufacturers often use more parallel branches and thicker flat copper wires in their designs to improve overall performance. However, this also results in greater heat generation, and the amount of heat dissipation is often directly proportional to performance. Currently, round wire or flat wire motors used in construction machinery often employ water-cooling or stator oil-cooling designs, but their heat dissipation performance still needs improvement. Utility Model Content

[0003] Therefore, it is necessary to provide a high-speed flat wire motor rotor oil-cooling structure to address the aforementioned technical problems.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A high-speed flat wire motor rotor oil-cooling structure is characterized in that the high-speed flat wire motor rotor oil-cooling structure includes a main shaft and a rotor body, the front part of the rotor body is provided with a front cover plate, and the rear part of the rotor body is provided with a rear cover plate.

[0006] The spindle's resolving end is provided with a hollow oil injection channel. The front part of the sidewall of the oil injection channel has four first oil injection holes, and the middle part of the sidewall of the oil injection channel has four second oil injection holes.

[0007] The rotor body is provided with eight through-type cooling channels.

[0008] The front cover plate has four front oil outlet holes, and the rear cover plate has four rear oil outlet holes.

[0009] The oil injection channel is connected to the rear oil outlet through the first oil injection hole and the cooling channel.

[0010] The oil injection channel is connected to the front oil outlet through the second oil injection hole and the cooling channel.

[0011] In a preferred embodiment of this utility model, the rotor body is made of stacked silicon steel sheets.

[0012] In a preferred embodiment of the present invention, the cooling channel is provided with a few interfering flow steps in the axial direction.

[0013] In a preferred embodiment of this utility model, the front cover plate and the rear cover plate are made of stainless steel.

[0014] In a preferred embodiment of this utility model, the front cover plate, the rear cover plate, and the rotor body are fixedly connected by screws.

[0015] In a preferred embodiment of the present invention, the rotor body is provided with a plurality of weight-reducing holes along its axial direction.

[0016] In a preferred embodiment of the present invention, a pair of positioning grooves are provided on the side wall of the main shaft, a rotor center hole is provided at the center of the rotor body, and a pair of positioning protrusions are provided on the inner wall of the rotor center hole, the positioning protrusions cooperating with the positioning grooves.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This utility model provides a high-speed flat wire motor rotor oil cooling structure. This high-speed flat wire motor rotor oil cooling structure utilizes the interlaced cooling channels and turbulence steps inside the rotor body to make the oil more turbulent at high speeds, which breaks the laminar flow structure, carries away more heat, and has a significant heat dissipation effect. It effectively reduces the temperature of the magnets, ensures that the magnets do not demagnetize at high temperatures, and ensures that the motor has higher performance and efficiency. Attached Figure Description

[0019] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the oil-cooled rotor structure of the high-speed flat wire motor of this utility model.

[0021] Figure 2 for Figure 1 A three-dimensional structural diagram of the oil-cooled rotor structure of a high-speed flat wire motor, shown from another perspective;

[0022] Figure 3 for Figure 1 A cross-sectional schematic diagram of the oil-cooled rotor structure of a high-speed flat wire motor.

[0023] Figure 4 for Figure 1 A cross-sectional schematic diagram of the oil-cooled rotor structure of a high-speed flat wire motor, shown from another perspective;

[0024] Figure 5 for Figure 1A cross-sectional schematic diagram of the oil-cooled rotor structure of a high-speed flat wire motor, shown from another perspective;

[0025] Figure 6 for Figure 1 A three-dimensional structural diagram of the oil-cooled rotor structure of a high-speed flat wire motor is shown, with a partial view of the internal structure.

[0026] Figure 7 for Figure 6 A magnified view of the details of region A in the diagram;

[0027] Figure 8 for Figure 1 A schematic diagram showing a partial three-dimensional structural breakdown of the oil-cooled rotor structure of a high-speed flat wire motor.

[0028] Figure 9 for Figure 8 A magnified view of the details of region B in the diagram;

[0029] Figure 10 for Figure 8 A magnified view of the details of region C in the diagram;

[0030] The markings in the diagram are explained as follows: 1. Rotor body; 11. Cooling channel; 111. Turbulence step; 12. Rotor center hole; 121. Positioning protrusion; 13. Weight reduction hole; 2. Main shaft; 21. Oil injection channel; 22. First oil injection hole; 23. Second oil injection hole; 3. Front cover plate; 31. Front oil outlet hole; 4. Rear cover plate; 41. Rear oil outlet hole; 5. Screw. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] like Figures 1 to 5 As shown, the high-speed flat wire motor rotor oil-cooled structure includes a main shaft 2 and a rotor body 1. The front of the rotor body 1 is provided with a front cover plate 3, and the rear of the rotor body 1 is provided with a rear cover plate 4. The front cover plate 3, the rear cover plate 4, and the rotor body 1 are fixedly connected by screws 5.

[0033] The spindle 2 has a hollow oil injection channel 21 at the resolving end. The front of the side wall of the oil injection channel 21 has four first oil injection holes 22, and the middle of the side wall of the oil injection channel 21 has four second oil injection holes 23.

[0034] like Figures 5 to 7As shown, the rotor body 1 has eight through-type cooling channels 11, the front cover plate 3 has four front oil outlet holes 31, and the rear cover plate 4 has four rear oil outlet holes 41. The oil injection channel 21 is connected to the rear oil outlet holes 41 through the first oil injection hole 22, the cooling channel 11, and the second oil injection hole 23, the cooling channel 11, and the front oil outlet holes 31.

[0035] It should be noted that the cooling channel 11 has a slight interference flow step 111 in the axial direction. The rotor body 1 is made of stacked silicon steel sheets. Specifically, as Figure 7 As shown, the rotor body 1 is divided into four sections, each of which is offset by a small angle to form a corresponding turbulence step 111.

[0036] In addition, the front cover plate 3 and the rear cover plate 4 are made of stainless steel. The rotor body 1 is provided with several weight-reducing holes 13 in the axial direction to further reduce the weight of the rotor body 1.

[0037] like Figures 8 to 10 As shown, the main shaft 2 has a pair of positioning grooves 220 on its side wall, and the rotor body 1 has a rotor center hole 12 at its center. The inner wall of the rotor center hole 12 has a pair of positioning protrusions 121, which cooperate with the positioning grooves 220.

[0038] The working principle of the oil-cooled rotor structure of this high-speed flat wire motor is explained below.

[0039] like Figure 3 As shown, the cooling oil enters from the cooling channel 11, passes through the first oil injection hole 22 and the oil groove reserved on the inner wall of the front cover plate 3, and finally flows out from the rear oil outlet hole 41 on the rear cover plate 4, flows back to the stator, and then recirculates into the cooling channel 11.

[0040] like Figure 4 As shown, the cooling oil enters from the cooling channel 11, passes through the second oil injection hole 23 and the oil groove reserved on the inner wall of the rear cover plate 4, and finally flows out from the front oil outlet hole 31 on the front cover plate 3, flows back to the stator, and then recirculates into the cooling channel 11.

[0041] It should be noted that the cooling oil enters from the resolver end and is diverted to the stator's cooling oil. The cooling oil is very pure and free of impurities such as iron filings that could affect insulation, so there is no risk of insulation failure in the motor.

[0042] exist Figure 3 and Figure 4In it, since the stator has an 8-pole structure, the rotor body 1 correspondingly adopts 8 circuits. Among them, these 8 circuits are evenly divided left and right, with 4 circuits on each side, flowing in from the left and out from the right, or flowing in from the right and out from the left, forming a "day" character shape. Through this staggered convection design, more heat can be taken away.

[0043] During the process of the cooling oil flowing through the cooling channel 11, due to the existence of the turbulence step 111, it is easier to make the oil form turbulence at high rotational speeds, destroying the laminar flow structure, and thus taking away more heat.

[0044] Since the front cover plate 3 and the rear cover plate 4 are made of stainless steel, compared with the traditional design of press-fitting aluminum plates, they have better structural rigidity. In addition, through the interference fit between the positioning protrusion 121 and the positioning groove 220, it is ensured that the rotor core will not scatter at high rotational speeds, resulting in stator rubbing and structural failure. At the same time, the overall size of the rotor is also more compact.

[0045] This oil-cooling structure of the high-speed flat wire motor rotor utilizes the staggered cooling channels 11 inside the rotor body and the turbulence steps 111 in the cooling channels 11. It is easier to make the oil form turbulence at high rotational speeds, destroying the laminar flow structure, taking away more heat, with obvious heat dissipation effect, effectively reducing the temperature of the magnetic steel, ensuring no demagnetization at high temperatures, and ensuring that the motor has higher performance and efficiency.

[0046] Obviously, the embodiments described above are only a part of the embodiments of the present application, rather than all the embodiments. The drawings give the preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. A high-speed flat wire motor rotor oil cooling structure, characterized by, The high-speed flat wire motor rotor oil-cooling structure includes a main shaft (2) and a rotor body (1). The front part of the rotor body (1) is provided with a front cover plate (3), and the rear part of the rotor body (1) is provided with a rear cover plate (4). The spindle (2) has a hollow oil injection channel (21) at the resolving end. The front of the side wall of the oil injection channel (21) has four first oil injection holes (22), and the middle of the side wall of the oil injection channel (21) has four second oil injection holes (23). The rotor body (1) is provided with eight through cooling channels (11). The front cover plate (3) is provided with four front oil outlet holes (31), and the rear cover plate (4) is provided with four rear oil outlet holes (41). The oil injection channel (21) is connected to the rear oil outlet (41) through the first oil injection hole (22) and the cooling channel (11). The oil injection channel (21) is connected to the front oil outlet (31) through the second oil injection hole (23) and the cooling channel (11).

2. The high speed flat wire motor rotor oil cooling structure of claim 1, wherein, The rotor body (1) is made of stacked silicon steel sheets.

3. The high speed flat wire motor rotor oil cooling structure of claim 1, wherein, The cooling channel (11) is provided with a minor disturbance flow step (111) in the axial direction.

4. The high speed flat wire motor rotor oil cooling structure of claim 1, wherein, The front cover (3) and rear cover (4) are made of stainless steel.

5. The high speed flat wire motor rotor oil cooling structure of claim 1, wherein, The front cover plate (3), the rear cover plate (4) and the rotor body (1) are fixedly connected by screws (5).

6. The high speed flat wire motor rotor oil cooling structure of claim 1, wherein, The rotor body (1) is provided with several weight-reducing holes (13) in the axial direction.

7. The high-speed flat wire motor rotor oil-cooling structure according to claim 1, characterized in that, The main shaft (2) has a pair of positioning grooves (220) on its side wall, and the rotor body (1) has a rotor center hole (12) at its center. The inner wall of the rotor center hole (12) has a pair of positioning protrusions (121) that cooperate with the positioning grooves (220).

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