Motor iron core with good heat dissipation performance

Abstract

The utility model relates to the technical field of motor iron cores, in particular to a motor iron core with good heat dissipation performance, which comprises an iron core plate body. A plurality of first heat dissipation grooves are formed in the top surface and the bottom surface of each silicon steel sheet; a plurality of third heat dissipation grooves are formed in the circumferential outer walls of the silicon steel sheets, and a plurality of first heat dissipation fins are fixed to the arc-shaped inner walls of the third heat dissipation grooves; the first heat dissipation grooves are formed in the top faces and the bottom faces of the silicon steel sheets and matched with the second heat dissipation fins at the upper ends and the lower ends to form axial heat dissipation channels, and iron core end face heat can be rapidly conducted out; the second heat dissipation grooves in the circumferential outer wall are communicated with the third heat dissipation grooves in the inner wall, and the first heat dissipation fins with the arc-shaped inner wall are combined, so that a circumferential heat conduction path is constructed, and heat resistance is effectively reduced; meanwhile, the heat dissipation area is increased while the structural strength is guaranteed through the design of the heat dissipation grooves with the trapezoidal sections; the heat dissipation grooves which are annularly distributed at equal intervals are communicated with the cavity of the winding assembly, a three-dimensional convection channel is formed, and the air flowing heat dissipation effect is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of motor core technology, specifically to a motor core with good heat dissipation performance. Background Technology

[0002] The motor core is the core component for energy conversion in a motor, generating a significant amount of heat during operation due to eddy current and hysteresis losses. As motors evolve towards higher power density and miniaturization—for example, the power density of drive motors in new energy vehicles has exceeded 6kW / kg—traditional cooling solutions are insufficient to meet the demands for rapid heat dissipation. Therefore, innovative heat dissipation structure design and optimized heat conduction paths are crucial for ensuring stable motor operation and improving service life and efficiency.

[0003] Utility model patent application number CN202421184088.2 discloses a motor core, which includes a mounting bracket, an outer shell fitted over the mounting bracket, a connecting mechanism between the mounting bracket and the outer shell, and a coil fixing mechanism inside the mounting bracket. The coil fixing mechanism includes a sliding groove formed on the surface of the mounting bracket, a slider slidably connected inside the sliding groove, a winding rod fixedly connected to one side of the slider, a limiting plate fixedly connected to one side of the winding rod, and a fixing mechanism inside the winding rod. By setting the limiting plate, winding rod, sliding groove, and slider, the limiting plate limits the coil, the winding rod fixes the coil, and pressing the winding rod causes the slider on one side of the winding rod to slide within the sliding groove on the surface of the mounting bracket, connecting the mounting bracket and the winding rod. This avoids the problem of existing motor cores where damaged parts cannot be replaced individually, thus improving practicality.

[0004] Although the motor core allows for easy replacement of damaged parts, the device still presents the following problems in practical use: Multiple winding rods within the device are primarily used for winding, and the large number of coils wound around the rods after winding can easily lead to heat accumulation inside the core. However, existing cores lack a dedicated heat dissipation structure, preventing heat from being quickly dissipated through an effective path. This can cause excessive core temperature rise, affecting winding insulation performance and motor operating efficiency. Long-term operation may lead to localized overheating or even insulation aging and failure. Therefore, we propose a motor core with superior heat dissipation performance. Utility Model Content

[0005] The purpose of this invention is to provide a motor core with good heat dissipation performance to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A motor core with good heat dissipation performance includes:

[0008] The core plate includes multiple silicon steel sheets stacked vertically, and the overall shape of the silicon steel sheets is annular. Multiple first heat dissipation grooves are circumferentially formed on the top and bottom surfaces of the silicon steel sheets. Multiple third heat dissipation grooves are circumferentially formed on the outer circumferential wall of the silicon steel sheets, and multiple first heat dissipation fins are fixed on the inner wall of the third heat dissipation grooves. Multiple winding assemblies are circumferentially fixed on the inner circumferential wall of the silicon steel sheets. Each winding assembly has a second heat dissipation groove facing the inner wall of the silicon steel sheet. The second heat dissipation groove is trapezoidal in shape and connected to the third heat dissipation groove. Multiple toothed grooves are formed at the end of the winding assembly away from the silicon steel sheet.

[0009] Multiple second heat dissipation fins are fixed at the upper and lower ends of the iron core plate, respectively; the second heat dissipation fins are fixedly connected to the silicon steel sheets at the upper and lower ends, respectively.

[0010] As a preferred technical solution of this utility model, the cross-sectional shape of the first heat dissipation groove is trapezoidal, and the depth of the first heat dissipation groove is one-third of the thickness of the silicon steel sheet.

[0011] In this design, the structural strength of the silicon steel sheet is guaranteed while the heat dissipation area is effectively increased, the heat dissipation efficiency is improved, and a balance between heat dissipation and structural performance is achieved.

[0012] As a preferred technical solution of this utility model, the first heat dissipation groove is distributed in a ring with equal spacing, and the inner end of the first heat dissipation groove is located between two adjacent winding components.

[0013] This design promotes uniform heat dissipation and forms a linked heat dissipation path, which can ensure the temperature balance of the multi-pole motor and optimize the overall heat dissipation effect.

[0014] As a preferred technical solution of this utility model, the third heat dissipation groove has an arc-shaped structure, and the first heat dissipation fins are fan-shaped plates disposed on the inner wall of the third heat dissipation groove, and the length of the fins is %-% of the depth of the third heat dissipation groove.

[0015] This design helps reduce thermal resistance, makes full use of space to expand the heat dissipation area, adapts to compact motors, and enhances circumferential heat dissipation capabilities.

[0016] As a preferred technical solution of this utility model, the silicon steel sheet and the winding assembly are integrally stamped and formed, and both the silicon steel sheet and the winding assembly are made of non-oriented silicon steel.

[0017] In this configuration, the material is integrally stamped and made of non-oriented silicon steel, eliminating assembly gaps, improving rigidity and precision, adapting to automated production, and ensuring magnetic properties and processing efficiency.

[0018] As a preferred technical solution of this utility model, the tooth groove is rectangular in shape, and the tooth tip of the tooth groove is rounded.

[0019] This design facilitates winding embedding, effectively reduces magnetic field distortion and electromagnetic noise, and is suitable for motor scenarios with high requirements for operating accuracy and noise control.

[0020] As a preferred technical solution of this utility model, the second heat dissipation fins are distributed in a ring with equal spacing, the second heat dissipation fins are made of a high thermal conductivity material, and the surface of the second heat dissipation fins is coated with a graphene coating.

[0021] This design facilitates uniform turbulence during rotation, while also offering advantages such as efficient heat dissipation, oxidation resistance, and long lifespan, thus enhancing heat dissipation at the core end face.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] By creating first heat dissipation grooves on the top and bottom surfaces of the silicon steel sheet, and combining them with second heat dissipation fins at the top and bottom, an axial heat dissipation channel is formed, which can quickly dissipate heat from the end face of the iron core. The second heat dissipation groove on the outer circumference wall is connected to the third heat dissipation groove on the inner wall, and combined with the first heat dissipation fins on the arc-shaped inner wall, a circumferential heat conduction path is constructed, which effectively reduces thermal resistance. At the same time, the trapezoidal cross-section heat dissipation groove design increases the heat dissipation area while ensuring structural strength. The annularly spaced heat dissipation grooves are connected to the winding assembly cavity to form a three-dimensional convection channel, which enhances the airflow heat dissipation effect, avoids heat accumulation in the coil winding area, and improves insulation performance and motor operating efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the silicon steel sheet in this utility model;

[0026] Figure 3 This is a top view of the silicon steel sheet structure in this utility model;

[0027] Figure 4 This utility model Figure 3 Enlarged structural diagram of section A in the middle;

[0028] Figure 5 This utility model Figure 3 Enlarged structural diagram of section B in the middle;

[0029] In the picture:

[0030] 1. Silicon steel sheet; 10. First heat dissipation groove; 101; 11. Winding assembly; 110. Second heat dissipation groove; 111. Toothed groove; 12. Third heat dissipation groove; 120. First heat dissipation fin;

[0031] 2. Second heat dissipation fins. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] This embodiment provides a technical solution:

[0034] Please see Figures 1-5 As shown, a motor core with good heat dissipation performance includes a core plate and multiple silicon steel sheets 1 stacked vertically. The silicon steel sheets 1 are generally annular in shape. Multiple first heat dissipation grooves 10 are circumferentially formed on the top and bottom surfaces of the silicon steel sheets 1. Multiple third heat dissipation grooves 12 are circumferentially formed on the outer circumferential wall of the silicon steel sheets 1. Multiple first heat dissipation fins 120 are fixed on the inner wall of the third heat dissipation grooves 12. Multiple winding assemblies 11 are fixed on the inner circumferential wall of the silicon steel sheets 1. Each winding assembly 11 has a second heat dissipation groove 110 facing the inner wall of the silicon steel sheets 1. The second heat dissipation groove 110 is trapezoidal in shape, with its opening gradually increasing in size towards the inner wall of the silicon steel sheets 1. The second heat dissipation groove 110 is connected to the third heat dissipation grooves 12. Multiple toothed grooves 111 are formed at the end of the winding assembly 11 away from the silicon steel sheets 1.

[0035] With the above configuration, silicon steel sheets 1 are vertically stacked to form a ring-shaped iron core plate, effectively reducing eddy current losses and improving magnetic conductivity. The first heat dissipation groove 10 on the top and bottom surfaces, combined with the second heat dissipation fins 2 at the upper and lower ends, form an axial heat dissipation channel to quickly dissipate heat from the end face. The third heat dissipation groove 12 on the outer circumference wall is connected to the second heat dissipation groove 110 on the inner wall, and together with the first heat dissipation fins 120, constructs a three-dimensional heat dissipation network, shortening the heat conduction path of the winding. The toothed groove 111 at the end of the winding assembly 11 is used for winding positioning, and the rectangular cross-section combined with the rounded transition tooth tip optimizes the magnetic circuit distribution.

[0036] In this embodiment, the interface shape of the first heat dissipation groove 10 is trapezoidal, with the opening gradually increasing from the bottom to the opening. The depth of the first heat dissipation groove 10 is one-third of the thickness of the silicon steel sheet 1. The trapezoidal structure, wider at the top and narrower at the bottom, increases the heat dissipation area, and the reasonable depth design balances the heat dissipation requirements and structural strength.

[0037] In this embodiment, the first heat dissipation grooves 10 are distributed in a ring with equal spacing, and the inner end of the first heat dissipation grooves 10 is located between two adjacent winding components 11. The ring layout makes heat dissipation uniform, and the inner end of the first heat dissipation grooves 10 is located between adjacent winding components 11, forming a linkage heat dissipation path of "heat dissipation groove → cavity → circumferential channel", which is particularly suitable for temperature control of multi-pole motors.

[0038] In this embodiment, the third heat dissipation slot 12 has an arc-shaped structure, and the first heat dissipation fins 120 are fan-shaped plates disposed on the inner wall of the third heat dissipation slot 12, fitting snugly against the inner wall of the third heat dissipation slot 12. The fin length is 80%-90% of the depth of the third heat dissipation slot 12. The snug fit design reduces contact thermal resistance; the fin height occupies 80%-90% of the slot depth, maximizing the heat dissipation area in a limited space, which is suitable for compact motor designs.

[0039] In this embodiment, the silicon steel sheet 1 and the winding assembly 11 are integrally stamped, and both the silicon steel sheet 1 and the winding assembly 11 are made of non-oriented silicon steel. The integral stamping design can eliminate assembly gaps and improve overall rigidity; synchronous forming ensures the positional accuracy of the heat dissipation groove and the toothed groove 111, and is suitable for automated production.

[0040] In this embodiment, the tooth groove 111 has a rectangular opening, and the tooth tip of the tooth groove 111 has rounded corners. The rectangular groove facilitates winding insertion, and the rounded tooth tip reduces air gap magnetic field distortion and electromagnetic noise, making it suitable for high-precision motor applications.

[0041] It is understood that in this embodiment, the silicon steel sheet 1 and the second heat dissipation fin 2 are fastened together by screws, which facilitates disassembly and maintenance; the first heat dissipation fin 120 is closely attached to the arc-shaped inner wall of the third heat dissipation groove 12 by brazing process, which reduces contact thermal resistance.

[0042] Furthermore, in this embodiment, multiple silicon steel sheets are fixed by adhesive bonding. When multiple silicon steel sheets are connected and fixed by adhesive bonding, a stable structure is formed by uniformly coating a high-performance adhesive on the surface of each silicon steel sheet, followed by stacking and curing. Among them, epoxy resin adhesive, with its high bonding strength and good insulation, can effectively prevent short circuits between silicon steel sheets; the inorganic adhesive containing ceramic particles has high temperature resistance and can maintain bonding stability when the motor is running under high load.

[0043] Please see Figure 1 As shown, multiple second heat dissipation fins 2 are fixed at the upper and lower ends of the iron core plate, respectively; the second heat dissipation fins 2 are fixedly connected to the silicon steel sheets 1 at the upper and lower ends, respectively.

[0044] With the above configuration, when the iron core rotates, the second heat dissipation fins 2, distributed at equal intervals in annular shape, rotate at high speed. Their unique fin structure generates strong disturbance to the surrounding airflow, prompting directional convection. This forced convection effect improves the heat exchange efficiency between the air and the fin surface, allowing heat to be transferred from the fins to the surrounding environment at a faster rate, effectively reducing the end face temperature of the iron core.

[0045] In this embodiment, the second heat dissipation fins 2 are arranged in a ring with equal spacing. The second heat dissipation fins 2 are made of a high thermal conductivity material and are coated with a graphene coating. The ring layout ensures uniform heat dissipation, and the equal spacing design makes airflow disturbance more regular, forming a stable convection field. The use of high thermal conductivity materials such as copper alloy or aluminum-magnesium alloy facilitates the rapid dissipation of heat from the iron core end face; the graphene coating on the surface has excellent thermal conductivity and oxidation resistance, extending the service life of the second heat dissipation fins 2.

[0046] Understandably, the second heat sink fin 2 is securely connected to the silicon steel sheet 1 using a press-fitting process, combining structural strength with convenience. During assembly, pressure is applied to the pre-set riveting points of the fin using a special mold, causing localized plastic deformation and embedding it into the corresponding groove of the silicon steel sheet 1, forming a tight interlocking structure. This connection method eliminates the need for welding or adhesives, avoiding the impact of high temperatures on the magnetic properties of the silicon steel sheet and preventing the risk of loosening due to adhesive aging.

[0047] When the core plate rotates, the second heat dissipation fins 2 fixed at its upper and lower ends rotate synchronously. The annular, equally spaced structure causes the second heat dissipation fins 2 to cut through the air at high speed, generating a strong airflow disturbance effect. Under this forced convection, the outside cold air is quickly guided to the first heat dissipation groove 10 and flows along the axial channels on the top and bottom surfaces of the silicon steel sheet 1, carrying away the end face heat. At the same time, the third heat dissipation groove 12 on the outer circumferential wall and the second heat dissipation groove 110 on the inner wall form a circumferential heat dissipation channel. Together with the first heat dissipation fins 120 that are tightly fitted to the arc-shaped inner wall, the heat generated by the winding at the winding assembly 11 is conducted to the fin surface through the channels. When the high-speed airflow sweeps over the fins, it quickly carries away the accumulated heat, achieving efficient heat exchange from the inside of the core to the external environment.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A motor core with good heat dissipation performance, characterized in that, include: The core plate includes multiple silicon steel sheets (1) stacked vertically, and the overall shape of the silicon steel sheets (1) is annular; the top and bottom surfaces of the silicon steel sheets (1) are provided with multiple first heat dissipation grooves (10) in the circumferential direction; the outer circumferential wall of the silicon steel sheets (1) is provided with multiple third heat dissipation grooves (12) in the circumferential direction, and multiple first heat dissipation fins (120) are fixed on the inner wall of the third heat dissipation grooves (12); multiple winding components (11) are fixed on the inner circumferential wall of the silicon steel sheets (1), and each winding component (11) is provided with a second heat dissipation groove (110) facing the inner wall of the silicon steel sheets (1). The second heat dissipation groove (110) is trapezoidal in shape and is connected to the third heat dissipation groove (12). Multiple toothed grooves (111) are provided at the end of the winding component (11) away from the silicon steel sheets (1). Multiple second heat dissipation fins (2) are fixed at the upper and lower ends of the iron core plate respectively; the second heat dissipation fins (2) are fixedly connected to the silicon steel sheets (1) at the upper and lower ends respectively.

2. The motor core with good heat dissipation performance according to claim 1, characterized in that: The first heat sink (10) has a trapezoidal cross-sectional shape, and the depth of the first heat sink (10) is one-third of the thickness of the silicon steel sheet (1).

3. The motor core with good heat dissipation performance according to claim 1, characterized in that: The first heat dissipation groove (10) is distributed in a ring with equal spacing, and the inner end of the first heat dissipation groove (10) is located between two adjacent winding components (11).

4. The motor core with good heat dissipation performance according to claim 1, characterized in that: The third heat dissipation groove (12) has an arc-shaped structure. The first heat dissipation fins (120) are fan-shaped plates arranged on the inner wall of the third heat dissipation groove (12), and the length of the fins is 80%-90% of the depth of the third heat dissipation groove (12).

5. The motor core with good heat dissipation performance according to claim 1, characterized in that: The silicon steel sheet (1) and the winding assembly (11) are integrally stamped and formed, and both the silicon steel sheet (1) and the winding assembly (11) are made of non-oriented silicon steel.

6. The motor core with good heat dissipation performance according to claim 1, characterized in that: The tooth groove (111) has a rectangular opening, and the tooth tip of the tooth groove (111) has a rounded corner.

7. The motor core with good heat dissipation performance according to claim 1, characterized in that: The second heat dissipation fins (2) are distributed in a ring with equal spacing. The second heat dissipation fins (2) are made of a high thermal conductivity material and the surface of the second heat dissipation fins (2) is coated with a graphene coating.

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