Permanent magnet synchronous motor rotor with heat dissipation structure

Abstract

The utility model relates to a permanent magnet synchronous motor rotor with a heat dissipation structure, which comprises a rotor iron core and a permanent magnet, the rotor also comprises a phase change heat storage assembly, the rotor iron core is also provided with a permanent magnet mounting hole matched with the permanent magnet in shape along the axial direction, and the permanent magnet is mounted in the permanent magnet mounting hole; the rotor core is also axially provided with a phase change mounting hole matched with the phase change heat storage assembly, the phase change heat storage assembly comprises an outer sleeve unit and a phase change unit, the phase change unit is located in the outer sleeve unit, and the outer sleeve unit is mounted in the phase change mounting hole. Compared with the prior art, the motor has the advantages of high heat dissipation efficiency, stable rotor operation and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the stator structure field especially is concerned with a permanent magnet synchronous motor rotor with heat dissipation structure. BACKGROUND

[0002] With the rapid development of new energy vehicles, vehicle permanent magnet synchronous motors face higher power and efficiency requirements. The improvement of motor efficiency is closely related to the loss in its operation process. The larger the loss, the lower the efficiency. Most of the motor loss is converted into heat, which leads to an increase in motor temperature and causes a series of problems: the performance of motor insulation materials may degrade, the permanent magnets on the rotor may demagnetize or the magnetic properties may decrease, and the mechanical strength and mechanical properties of the internal metal materials of the motor may also gradually decrease. This not only exacerbates the energy loss of the motor, but also increases the heat generation, forming a vicious cycle, which seriously affects the efficiency and service life of the motor. Therefore, to ensure the normal operation of the vehicle motor, prolong its service life and improve its efficiency, it is particularly important to implement efficient thermal management.

[0003] The existing technology has several deficiencies in the heat dissipation of vehicle permanent magnet synchronous motors. The heat generated by the motor mainly comes from the stator loss. The stator is located outside the motor and can transfer heat to the casing through direct contact with the casing and dissipate through heat convection. However, the rotor is located inside the motor and has an air gap between the stator and the rotor, so the rotor cannot obtain effective heat dissipation through direct contact.

[0004] At the same time, the heat transferred from the stator to the rotor and the small amount of loss heat generated by the rotor itself lack heat dissipation channels, and the sealing design of the motor makes it difficult to discharge these heat in time, resulting in the rotor becoming the hottest part of the motor, further causing irreversible demagnetization of the permanent magnet, a decrease in magnetic properties, and a decrease in the overall performance of the motor.

[0005] To solve this problem, some existing technologies attempt to install phase change heat transfer devices inside the rotor to enhance heat dissipation. However, the use of phase change heat transfer devices not only increases the production cost of the motor, but also makes the manufacturing process more complex and may pose a potential risk to the insulation and safety of the motor. More importantly, when the motor rotor rotates at high speed, the rotational speed significantly affects the heat dissipation effect of the phase change heat transfer device, resulting in insufficient heat conduction performance. UTILITY MODEL CONTENTS

[0006] The utility model aims to overcome the defects of the existing technology, such as poor heat dissipation effect of the motor rotor, poor heat dissipation performance of the phase change heat transfer device affected by the high-speed rotation of the rotor, and increased cost of the motor rotor, and provides a permanent magnet synchronous motor rotor with a heat dissipation structure.

[0007] The purpose of the utility model can be achieved by the following technical solutions:

[0008] A permanent magnet synchronous motor rotor with a heat dissipation structure, comprising a rotor core and a permanent magnet, the rotor further comprising a phase change heat storage assembly, the rotor core being further provided with permanent magnet mounting holes matched with the shape of the permanent magnet along the axial direction, and the permanent magnet being mounted in the permanent magnet mounting hole; the rotor core is further provided with phase change mounting holes matched with the phase change heat storage assembly along the axial direction, the phase change heat storage assembly comprising a sleeve unit and a phase change unit, the phase change unit being located in the sleeve unit, and the sleeve unit being mounted in the phase change mounting hole.

[0009] Preferably, the rotor core is provided with a shaft hole on the central axis, and the phase change mounting hole is located between the shaft hole and the permanent magnet mounting hole.

[0010] Preferably, the number of the phase change mounting hole and the permanent magnet mounting hole is multiple, and each phase change mounting hole and permanent magnet mounting hole is uniformly distributed along the circumference of the rotor core.

[0011] Preferably, the permanent magnet mounting hole is a V-shaped structure, the side of the phase change mounting hole close to the permanent magnet mounting hole is an inverted V-shaped structure, and is located between two permanent magnet mounting holes, and the side of the phase change mounting hole close to the shaft hole is a circular arc structure.

[0012] Preferably, the sleeve unit is a three-dimensional porous structure, and the phase change unit is flowable in the sleeve unit.

[0013] Preferably, the material of the sleeve unit comprises metal foam or metal wire mesh sintered block.

[0014] Preferably, the sleeve unit is provided with a capillary structure for backflow of the phase change material, and the capillary structure is communicated with both ends of the sleeve unit.

[0015] Preferably, the rotor core is respectively provided with a top fixed cover plate and a bottom fixed cover plate at both ends, the top fixed cover plate is located at one end of the permanent magnet mounting hole and the phase change mounting hole, and the bottom fixed cover plate is located at the other end of the permanent magnet mounting hole and the phase change mounting hole.

[0016] Preferably, the phase change unit comprises paraffin.

[0017] Preferably, the rotor core comprises multiple layers of silicon steel sheets, and each layer of silicon steel sheet is coaxially mounted and welded.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] (1) The scheme is embedded in the rotor core by embedding the phase change heat storage assembly, which not only absorbs and stores the heat generated by the rotor during the operation of the motor, but also releases the heat stored in the phase change unit during the shutdown of the motor. The phase change unit has a large latent heat, which can absorb a large amount of heat during the phase change process, thereby effectively avoiding the overheating and demagnetization problems of the rotor caused by heat accumulation in the traditional cooling method. And fixed on the rotor core through the sleeve unit, it can still maintain excellent cooling effect even at high speed, solving the challenge of traditional cooling methods in high load and high speed operation.

[0020] (2) The phase change installation hole of the phase change heat storage assembly is arranged between the rotating shaft hole and the permanent magnet installation hole, which not only optimizes the magnetic circuit design of the motor, but also ensures that the phase change heat storage assembly can efficiently cool while not interfering with the electromagnetic performance of the motor. The clever layout of the phase change heat storage assembly balances the electromagnetic performance and cooling effect of the rotor, solving the problem of interference with the magnetic circuit caused by traditional cooling equipment.

[0021] (3) The phase change heat storage assembly in the scheme adopts three-dimensional porous material to prepare the sleeve unit, and the unique pore structure of the material effectively promotes the flow of paraffin phase change material, improves the fluidity and thermal conductivity of the phase change material, and improves the heat transfer efficiency and heat storage rate. Compared with the traditional single-material sleeve design, the three-dimensional porous material significantly enhances the thermal management performance, enabling the motor rotor to absorb and release heat more quickly during operation, thereby prolonging the stable operation time of the motor under high load.

[0022] (4) Compared with the existing cooling device, which usually requires a complex sealing design to prevent liquid cooling medium from leaking, not only increases the production cost, but also improves the structural complexity. The scheme seals the paraffin in the sleeve unit by installing rotor end plates at both ends of the rotor, effectively avoiding the leakage problem and reducing the production cost. The design of the rotor end plate ensures that the phase change material is stably packaged in the sleeve, avoiding leakage during motor operation, and facilitating the installation of the sleeve and the permanent magnet, thereby improving the assembly efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The utility model provides an explosion structure schematic diagram of permanent magnet synchronous motor rotor based on heat dissipation structure;

[0024] Figure 2 The utility model provides a structure schematic diagram of phase change heat storage unit and permanent magnet;

[0025] Figure 3 The utility model provides a structure schematic diagram of rotor core;

[0026] Figure 4 The utility model provides a heat absorption and heat release cycle principle schematic diagram of phase change heat storage unit;

[0027] In the figure: 1, rotor core, 2, permanent magnet, 3, phase change heat storage assembly, 4, top fixed cover plate, 5, bottom fixed cover plate; 11, permanent magnet mounting hole, 12, phase change mounting hole, 13, rotating shaft hole, 31, outer sleeve unit, 32, heat absorption section, 33, condensation section, 34, capillary structure. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0030] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] It should be noted that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0033] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment provides a permanent magnet synchronous motor rotor with a heat dissipation structure, including a rotor core 1 and a permanent magnet 2. The rotor also includes a phase change heat storage component 3. The rotor core 1 is provided with a permanent magnet mounting hole 11 along the axial direction that matches the shape of the permanent magnet 2, and the permanent magnet 2 is installed in the permanent magnet mounting hole 11. The rotor core 1 is also provided with a phase change mounting hole 12 along the axial direction that matches the phase change heat storage component 3. The phase change heat storage component 3 includes an outer sleeve unit 31 and a phase change unit. The phase change unit is located inside the outer sleeve unit 31, and the outer sleeve unit 31 is installed in the phase change mounting hole 12.

[0036] Working principle: The rotor core 1 drives the permanent magnet 2 to rotate, forming a motor magnetic field, which drives the electric motor. The phase change heat storage component 3 is installed in the phase change mounting hole 12 of the rotor core 1. The phase change unit in the outer sleeve unit 31 of the phase change heat storage component 3 can rotate with the rotor core 1 and absorb the heat generated by the rotor during the rotation, so that the temperature of the rotor is kept stable. After the rotor stops rotating, the absorbed heat is released.

[0037] This solution embeds a phase change heat storage component 3 into the rotor core 1, which not only absorbs and stores the heat generated by the rotor during motor operation but also releases the heat stored in the phase change unit when the motor stops. The phase change unit has a large latent heat, absorbing a significant amount of heat during the phase change process, thus effectively avoiding rotor overheating and demagnetization problems caused by heat accumulation in traditional cooling methods. Furthermore, it is fixed to the rotor core 1 by an outer casing unit 31, ensuring excellent heat dissipation even during high-speed motor operation, solving the challenges posed by traditional cooling methods that struggle to handle high loads and high-speed operation.

[0038] Preferred implementation methods, such as Figure 3 As shown, a shaft hole 13 is provided on the central axis of the rotor core 1, and a phase change mounting hole 12 is located between the shaft hole 13 and the permanent magnet mounting hole 11.

[0039] The existing heat dissipation device usually occupies a large space, which may affect the magnetic circuit design of the motor, thereby affecting the electromagnetic performance. In the embodiment, the phase change mounting hole 12 of the phase change heat storage assembly 3 is arranged between the rotating shaft hole 13 and the permanent magnet mounting hole 11 of the rotor core 1, which not only optimizes the magnetic circuit design of the motor, but also ensures that the phase change heat storage assembly 3 can dissipate heat efficiently without interfering with the electromagnetic performance. The layout of the phase change heat storage assembly balances the electromagnetic performance and heat dissipation effect of the rotor, solving the problem of interference of the traditional heat dissipation device on the magnetic circuit.

[0040] Further, the number of phase change mounting holes 12 and permanent magnet mounting holes 11 is multiple, and each phase change mounting hole 12 and permanent magnet mounting hole 11 is uniformly distributed along the circumference of the rotor core 1.

[0041] The mounting hole of the phase change heat storage assembly is located between the shaft hole and the permanent magnet mounting hole of the rotor core. The layout not only optimizes the magnetic circuit design of the motor rotor, but also maintains the electromagnetic performance of the motor unaffected. The effective work of the phase change heat storage assembly and the performance of the motor achieve a good balance, ensuring that they are compatible and support each other.

[0042] As shown in FIG. 1, the phase change heat storage assembly 3 is arranged between the rotating shaft hole 13 and the permanent magnet mounting hole 11 of the rotor core 1. Figure 2 As shown in FIG. 1, the permanent magnet mounting hole 11 is a V-shaped structure, the side of the phase change mounting hole 12 close to the permanent magnet mounting hole 11 is an inverted V-shaped structure, and is located between the two permanent magnet mounting holes 11, and the side of the phase change mounting hole 12 close to the rotating shaft hole 13 is a circular arc structure.

[0043] The side wall of the mounting hole of the phase change heat storage assembly is provided with a first heat absorption surface, which faces the permanent magnet mounting hole and is arranged parallel to the side wall thereof, thereby improving the heat absorption efficiency of the heat transferred from the permanent magnet to the phase change heat storage assembly. In addition, the side wall of the phase change mounting hole is also provided with a second heat absorption surface, which faces the shaft hole and is in a circular arc shape, and the center of the circular arc is located at the center point of the rotor core, further optimizing the heat absorption process. Not only prolongs the running time of the motor under peak working conditions, but also improves the stability and service life of the motor.

[0044] In a preferred embodiment, the outer sleeve unit 31 is a three-dimensional porous structure, and the phase change unit is flowable and arranged in the outer sleeve unit 31.

[0045] The material of the outer sleeve unit 31 includes metal foam or metal wire mesh sintered block.

[0046] Further, the inner part of the outer sleeve unit 31 is provided with a capillary structure for backflow of the phase change material, and the capillary structure is connected between the two ends of the outer sleeve unit 31. Optionally, the material in the phase change unit adopts paraffin.

[0047] Specifically, the phase change heat storage assembly includes a sleeve unit, a phase change unit using a paraffin phase change material, and a capillary structure, and the paraffin phase change material is located in the sleeve unit. Unlike the traditional heat dissipation mode, the phase change heat storage technology is adopted in the embodiment, which can efficiently absorb and release heat, thereby improving the heat dissipation performance of the motor.

[0048] As shown in Figure 4 The two ends of the phase change heat storage unit are respectively the heat absorption section 32 and the condensation section 33, and the heat absorption section and the condensation section are connected through the capillary structure 34. The specific working principle of the phase change heat storage unit is as follows:

[0049] During the operation of the motor, the heat generated by the rotor is absorbed by the paraffin in the heat absorption section 32 of the phase change heat storage assembly. The paraffin changes from a liquid state to a gaseous state and stores heat. The paraffin gas enters the condensation section 33 of the phase change heat storage assembly and releases the stored heat through air cooling or other heat dissipation modes. The paraffin condenses from a gaseous state back to a liquid state. The liquid paraffin flows back to the heat absorption section through the capillary structure 34. The state of the paraffin is thus cycled, completing the cycle of heat absorption to release. This structure can ensure that the heat dissipation performance of the phase change heat storage assembly is not affected even when the rotor is rotating at high speed, effectively preventing the occurrence of rotor overheating and demagnetization.

[0050] Specifically, in order to improve the thermal conductivity and heat storage rate, the sleeve unit 31 is made of three-dimensional porous material and has a large number of pores inside to promote the flow of the paraffin phase change material. The liquid paraffin fills the pores of the sleeve and has strong heat storage capacity, and is in good contact with the rotor core, thereby improving the heat dissipation effect. The three-dimensional porous material can be selected from metal foam or metal wire mesh sintered block, but is not limited to these two, and other materials with excellent heat conduction performance can also be selected according to specific needs.

[0051] In a preferred embodiment, the rotor core 1 is provided with a top fixed cover plate 4 and a bottom fixed cover plate 5 at both ends, respectively. The top fixed cover plate 4 is located at one end of the permanent magnet mounting hole 11 and the phase change mounting hole 12, and the bottom fixed cover plate 5 is located at the other end of the permanent magnet mounting hole 11 and the phase change mounting hole 12.

[0052] The rotor core 1 is provided with fixed cover plates at both ends, and the two ends of the sleeve and the permanent magnet are in contact with the inner surface of the rotor end plate. The main function of the fixed cover plate is to seal the paraffin in the phase change heat storage assembly to prevent leakage of the liquid paraffin. This design not only effectively protects the safety of the paraffin phase change material, but also simplifies the installation process of the sleeve and the permanent magnet, thereby improving the production efficiency and reducing the manufacturing cost.

[0053] The rotor core 1 includes multiple layers of silicon steel sheets, and each layer of silicon steel sheets is coaxially installed and fixed by welding.

[0054] The rotor core 1 is usually welded by stacking a plurality of silicon steel sheets, and the shaft hole, the permanent magnet mounting hole and the phase change heat storage assembly mounting hole are processed by a stamping process, which is simple and low in cost, and can effectively improve the production efficiency

[0055] The preferred embodiments of the present application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the existing technology according to the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. A permanent magnet synchronous motor rotor with a heat dissipation structure, comprising a rotor core (1) and a permanent magnet (2), characterized in that, The rotor further comprises a phase change heat storage assembly (3), the rotor core (1) is further provided with permanent magnet mounting holes (11) matched with the shape of the permanent magnets (2) in the axial direction, and the permanent magnets (2) are mounted in the permanent magnet mounting holes (11); the rotor core (1) is further provided with phase change mounting holes (12) matched with the phase change heat storage assembly (3) in the axial direction, the phase change heat storage assembly (3) comprises a sleeve unit (31) and a phase change unit, the phase change unit is located in the sleeve unit (31), and the sleeve unit (31) is mounted in the phase change mounting hole (12); The rotor core (1) is provided with a rotating shaft hole (13) on the central axis, and the phase change mounting hole (12) is located between the rotating shaft hole (13) and the permanent magnet mounting hole (11); The number of the phase change mounting hole (12) and the permanent magnet mounting hole (11) is multiple, and each phase change mounting hole (12) and permanent magnet mounting hole (11) is uniformly distributed along the circumference of the rotor core (1); The permanent magnet mounting hole (11) is a V-shaped structure, the side of the phase change mounting hole (12) close to the permanent magnet mounting hole (11) is an inverted V-shaped structure, and is located between two permanent magnet mounting holes (11), and the side of the phase change mounting hole (12) close to the rotating shaft hole (13) is a circular arc structure; The sleeve unit (31) is a three-dimensional porous structure, and the phase change unit is flowable and arranged in the sleeve unit (31); The inside of the sleeve unit (31) is provided with a capillary structure for backflow of the phase change material, and the capillary structure is communicated with both ends of the sleeve unit (31).

2. The permanent magnet synchronous motor rotor with heat dissipation structure according to claim 1, characterized in that, The material of the sleeve unit (31) comprises metal foam or metal wire mesh sintered block.

3. The permanent magnet synchronous motor rotor with heat dissipation structure according to claim 1, characterized in that, The rotor core (1) is respectively provided with a top fixed cover plate (4) and a bottom fixed cover plate (5) at both ends, the top fixed cover plate (4) is located at one end of the permanent magnet mounting hole (11) and the phase change mounting hole (12), and the bottom fixed cover plate (5) is located at the other end of the permanent magnet mounting hole (11) and the phase change mounting hole (12).

4. The permanent magnet synchronous motor rotor with heat dissipation structure according to claim 1, characterized in that, The phase change unit comprises paraffin.

5. The permanent magnet synchronous motor rotor with heat dissipation structure according to claim 1, characterized in that, The rotor core (1) comprises multiple layers of silicon steel sheets, and each layer of silicon steel sheets is coaxially mounted and welded and fixed.

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