Medium and large-sized permanent magnet synchronous motor

Abstract

This application relates to the technical field of permanent magnet synchronous motors, and particularly to a medium-to-large permanent magnet synchronous motor. The medium-to-large permanent magnet synchronous motor includes a motor body and an air-water cooler disposed on the side wall of the motor body. The stator and rotor within the motor body are respectively provided with a first heat dissipation channel and a second heat dissipation channel. Two balance rings are provided on the rotor shaft, with the two balance rings respectively disposed on both sides of the rotor. Each balance ring includes a connecting portion connected to the shaft and a guide portion located outside the connecting portion and inclined away from the rotor. The guide portion is tapered. This application has the advantage of improving heat dissipation uniformity.

Description

Technical Field

[0001] This application relates to the technical field of permanent magnet synchronous motors, and particularly to a medium-to-large permanent magnet synchronous motor. Background Technology

[0002] In modern industry, medium and large permanent magnet synchronous motors are widely used in many key fields, such as wind power generation, rail transportation, and large industrial equipment drives, due to their high efficiency, energy saving, and good torque performance. These motors generate a large amount of heat during operation because of their high power and high torque characteristics.

[0003] To ensure the stable operation of motors under high load conditions for extended periods and to prevent performance degradation, shortened lifespan, or even damage due to overheating, a superior cooling method is crucial for reliable operation. Therefore, for medium to large-sized motors with high cooling requirements, air-water coolers are currently the most widely used cooling method.

[0004] The air-water cooler utilizes a unique heat exchange mechanism to drive airflow between the motor and the cooler, effectively dissipating the heat generated during motor operation. This cooling method can, to a certain extent, meet the heat dissipation requirements of medium and large motors and maintain their normal operating temperature.

[0005] However, existing methods of installing air-water coolers on motors have certain limitations. Typically, the air-water cooler is mounted on the side of the motor, with channels connecting it to the cooler constructed near both ends. While this layout promotes airflow circulation within the motor, thus achieving heat dissipation, the channel's location on the motor's sidewall results in uneven airflow distribution inside the motor.

[0006] Specifically, the stator area closer to the cooling channel can exchange heat more smoothly with the cooling airflow, resulting in relatively better heat dissipation. However, the stator area farther from the channel suffers from significantly poorer heat dissipation because the airflow cannot reach it sufficiently. This uneven heat dissipation not only leads to large temperature differences between different parts of the motor, affecting the overall stability of the motor's performance, but may also accelerate the aging and damage of motor components in that area due to localized overheating, thereby shortening the motor's lifespan. Utility Model Content

[0007] To alleviate the problem of uneven heat dissipation, this application provides a medium-to-large permanent magnet synchronous motor.

[0008] This application provides a medium-to-large permanent magnet synchronous motor, which adopts the following technical solution:

[0009] A medium-to-large permanent magnet synchronous motor includes a motor body and an air-water cooler disposed on the side wall of the motor body. The stator and rotor inside the motor body are respectively provided with a first heat dissipation channel and a second heat dissipation channel. The rotor shaft is provided with two balance rings, which are respectively disposed on both sides of the rotor.

[0010] The balance ring includes a connecting part connected to the rotating shaft and a guide part located outside the connecting part and inclined away from the rotor. The guide part is tapered.

[0011] In one embodiment: the connecting part and the guide part facing the rotor are stepped together, and the outer diameter of the connecting part is larger than the inner diameter of the second heat dissipation channel and smaller than the outer diameter of the second heat dissipation channel.

[0012] In one embodiment: a disturbance part is provided on the outer side of the guide part, the disturbance part includes a mounting ring connected to the guide part, the mounting ring is arranged in the radial direction, and the end face of the mounting ring facing the rotor direction is provided with a plurality of circumferentially arranged first disturbance blades.

[0013] In one embodiment: the connection position between the mounting ring and the guide is provided with a guide ring that protrudes toward the rotor direction.

[0014] In one embodiment, the guide ring and the mounting ring are set at an acute angle.

[0015] In one embodiment: the distance between the first disturbance blade and the guide ring is set.

[0016] In one embodiment: the mounting ring has a plurality of second disturbance blades arranged circumferentially on its end face facing away from the rotor, and the connecting part has a plurality of through holes arranged axially.

[0017] In one embodiment, the second disturbance blade is located on the side of the mounting ring near the axial direction.

[0018] In summary, this application has the following beneficial effects: it improves the uniformity of heat dissipation by guiding and directing the flow through the guide section; and it further improves the uniformity of heat dissipation by creating disturbance through the first disturbance blade. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the large permanent magnet synchronous motor in this embodiment;

[0020] Figure 2 This is a schematic diagram of the stator structure in the large permanent magnet synchronous motor in this embodiment;

[0021] Figure 3 This is a schematic diagram of the rotor structure in the large permanent magnet synchronous motor in this embodiment;

[0022] Figure 4 This is a schematic diagram of the front structure of the balance ring in the large permanent magnet synchronous motor in this embodiment;

[0023] Figure 5 This is a partial internal structure diagram of the large permanent magnet synchronous motor in this embodiment;

[0024] Figure 6 This is a schematic diagram of the back structure of the balance ring in the large permanent magnet synchronous motor in this embodiment.

[0025] In the figure, 100 is the motor body; 110 is the stator; 111 is the stator core; 1111 is the first heat dissipation channel; 112 is the stator base; 120 is the rotor; 121 is the rotor lamination; 122 is the shaft; 1211 is the second heat dissipation channel; 123 is the magnet; 200 is the air-water cooler; 210 is the cooling channel; 300 is the balance ring; 310 is the connecting part; 311 is the through hole; 320 is the guide part; 330 is the disturbance part; 331 is the mounting ring; 332 is the first disturbance blade; 340 is the guide ring; and 350 is the second disturbance blade. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] A medium to large permanent magnet synchronous motor, such as Figure 1 As shown, it includes a motor body 100 and an air-water cooler 200 disposed on the side wall of the motor body 100. Two cooling channels 210 are provided on both sides of the motor body 100.

[0029] Combined with appendix Figure 2 and attached Figure 3 The stator 110 and rotor 120 inside the motor body 100 are respectively provided with a first heat dissipation channel 1111 and a second heat dissipation channel 1211. The first heat dissipation channel 1111 is located on the stator 110 core outside the stator base 112. The first heat dissipation channel 1111 is divided into four groups, which are respectively located at the four corners of the stator 110 core. Each group of first heat dissipation channels 1111 includes multiple first heat dissipation channels 1111.

[0030] The second heat dissipation channel 1211 is provided on the rotor lamination 121 of the rotor 120. Multiple second heat dissipation channels 1211 are evenly distributed around the rotating shaft 122 of the rotor 120, and the second heat dissipation channel 1211 is located between the rotating shaft 122 and the magnet 123 on the rotor lamination 121. To form a larger aperture, the second heat dissipation channel 1211 has an isosceles trapezoidal structure, and the length of the base near the rotating shaft 122 is smaller than the length of the base away from the rotating shaft 122.

[0031] Reference Figure 1 Two balance rings 300 are provided on the rotating shaft 122 of the rotor 120. The two balance rings 300 are respectively located on both sides of the rotor 120, and both balance rings 300 are set as end caps close to both sides of the motor body 100.

[0032] Among them, such as Figure 4 As shown, the balance ring 300 includes a connecting part 310 connected to the rotating shaft 122, a guide part 320 located outside the connecting part 310 and inclined away from the rotor 120, and a disturbance part 330 provided outside the guide part 320. By being inclined, the guide part 320 is generally tapered.

[0033] The connecting part 310 is annular, and multiple through holes 311 are provided on the connecting part 310 along the axial direction. The through holes 311 are evenly distributed around the axis.

[0034] Combined with appendix Figure 3 and attached Figure 5 The connecting portion 310 and the guide portion 320 facing the rotor 120 are stepped together. The outer diameter 'a' of the connecting portion 310 is larger than the inner diameter 'r1' of the second heat dissipation channel 1211 and smaller than the outer diameter 'r2' of the second heat dissipation channel 1211. Preferably, the outer diameter 'a' of the connecting portion 310 is within the range of the inner diameter 'r1' and the outer diameter 'r2' of the second heat dissipation channel 1211. This arrangement allows the airflow guided by the guide portion 320 to be guided more effectively to the location of the second heat dissipation channel 1211 by the stepped guide.

[0035] Reference Figure 4 and attached Figure 5 The disturbance part 330 includes a mounting ring 331 and a first disturbance blade 332. The mounting ring 331 is connected to the outside of the guide part 320 and is circular in shape. The mounting ring 331 is arranged in the radial direction.

[0036] In order to better guide airflow, the radial position of the back side of the mounting ring 331 is offset from that of the cooling channel 210. That is, the minimum distance b between the cooling channel 210 and the end cover of the motor body 100 is greater than the minimum distance c between the mounting ring 331 and the end cover of the motor body 100. In this way, on the one hand, the distance between the balance ring 300 and the end cover is reduced, and on the other hand, more airflow can be guided.

[0037] The first disturbance blade 332 is used to disturb the airflow and carry part of the airflow that enters the motor body 100 from the cooling channel 210 to a position away from the cooling channel 210. The first disturbance blade 332 is located on the end face of the mounting ring 331 facing the rotor 120, and there are multiple first disturbance blades 332, which are evenly arranged in the circumferential direction.

[0038] Reference Figure 4 and attached Figure 5 A guide ring 340, protruding towards the rotor 120, is provided at the connection position between the mounting ring 331 and the guide portion 320. The first disturbance blade 332 is spaced apart from the guide ring 340. Furthermore, the guide ring 340 is angled away from the axis, creating an acute angle between the guide ring 340 and the mounting ring 331. The function of the guide ring 340 is to further enhance the disturbance effect by blocking airflow, thereby directing more airflow away from the cooling channel 210.

[0039] Reference Figure 6 The mounting ring 331 has multiple circumferentially arranged second disturbance blades 350 on its end face facing away from the rotor 120. These second disturbance blades 350 are evenly distributed around the axis of rotation and are spaced apart from the end cover of the motor body 100. Through the gap between the balance ring 300 and the end cover, a small portion of the airflow entering the motor body 100 from the cooling channel 210 can enter the rear of the balance ring 300 to dissipate heat from the bearings due to inertia and diffusion. The second disturbance blades 350 can agitate the airflow entering between the balance ring 300 and the end cover, creating a more uniform heat dissipation effect. The airflow entering between the balance ring 300 and the end cover can be discharged through the through hole 311 on the connecting part 310.

[0040] Since the disturbance of the second disturbance blade 350 will affect the airflow entering between the balance ring 300 and the end cover, the second disturbance blade 350 is placed on the side of the mounting ring 331 close to the axial direction, so that the airflow can first enter between the balance ring 300 and the end cover, and then cause disturbance, which can reduce the escape of airflow.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A medium-large permanent magnet synchronous motor, comprising a motor body (100) and an air-water cooler (200) arranged on the side wall of the motor body (100), characterized in that: The stator (110) and rotor (120) inside the motor body (100) are respectively provided with a first heat dissipation channel (1111) and a second heat dissipation channel (1211). The rotor (120) has two balance rings (300) on its shaft (122), and the two balance rings (300) are respectively located on both sides of the rotor (120). The balance ring (300) includes a connecting part (310) connected to the rotating shaft (122) and a guide part (320) located outside the connecting part (310) and inclined away from the rotor (120) from the connecting part (310), the guide part (320) being tapered.

2. The mid-large sized permanent magnet synchronous motor according to claim 1, characterized in that: The connecting part (310) facing the rotor (120) and the guide part (320) are stepped together. The outer diameter of the connecting part (310) is larger than the inner diameter of the second heat dissipation channel (1211) and smaller than the outer diameter of the second heat dissipation channel (1211).

3. The mid-large sized permanent magnet synchronous motor according to claim 1, characterized in that: The outer side of the guide portion (320) is provided with a disturbance portion (330), the disturbance portion (330) includes a mounting ring (331) connected to the guide portion (320), the mounting ring (331) is arranged in the radial direction, and the end face of the mounting ring (331) facing the rotor (120) is provided with a plurality of first disturbance blades (332) arranged in the circumferential direction.

4. The mid-large sized permanent magnet synchronous motor according to claim 3, characterized in that: The connection position between the mounting ring (331) and the guide (320) is provided with a guide ring (340) that protrudes toward the rotor (120).

5. The mid-large sized permanent magnet synchronous motor according to claim 4, characterized in that: The guide ring (340) and the mounting ring (331) are set at an acute angle.

6. Medium-large sized permanent magnet synchronous motor according to claim 3 or 4 or 5, characterized in that: The distance between the first disturbance blade (332) and the guide ring (340) is set.

7. The mid-large sized permanent magnet synchronous motor according to claim 3, characterized by: The mounting ring (331) has multiple second disturbance blades (350) arranged circumferentially on the end face opposite to the rotor (120), and the connecting part (310) has multiple through holes (311) arranged axially.

8. The mid-large sized permanent magnet synchronous motor according to claim 7, characterized by: The second disturbance blade (350) is located on the side of the mounting ring (331) near the axial direction.

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