A stator structure for a dual-cycle oil-cooled ultra-high efficiency permanent magnet motor

Abstract

This utility model relates to the field of motor stators and discloses a dual-cycle oil-cooled ultra-high-efficiency permanent magnet motor stator structure, including laminations a, b, and c. Mounting holes are formed through the outer sides of laminations a, b, and c, and rivets are provided on the inner walls of the mounting holes. Slots are formed on the outer sides of laminations a, b, and c, and fasteners are inserted into the inner walls of the slots. A heat dissipation assembly is provided on the rear side of lamination a. The heat dissipation assembly includes an inlet hole, which is formed through the front side of lamination a. In this utility model, the conical inlet hole in the heat dissipation assembly accelerates the injection of cooling oil. Furthermore, the continuously bent V-shaped guide grooves, combined with multiple sets of flow grooves in the middle of the stator teeth, allow the cooling oil to flow directly through the core heat-generating area where the coil contacts the teeth, directly carrying away the Joule heat generated by the coil's energization, thereby improving the heat dissipation effect of the device.

Description

Technical Field

[0001] This utility model relates to the field of motor stators, and in particular to a stator structure for a dual-cycle oil-cooled ultra-high efficiency permanent magnet motor. Background Technology

[0002] In the evolution of motor technology, the dual-cycle oil-cooled ultra-high efficiency permanent magnet motor, as a new generation of power device, is reshaping the power landscape of industrial drives and transportation with its excellent heat dissipation performance and ultra-high energy efficiency.

[0003] The dual-circulation oil cooling system consists of a primary external circulation and a secondary internal circulation. In the primary external circulation, cooling oil is pressurized by an oil pump and flows into the heat dissipation pipes outside the motor housing, carrying away the heat dissipated by the motor and initially reducing its temperature. The secondary internal circulation focuses on key heat-generating components inside the motor: cooling oil is sprayed directly onto the rotor magnets and stator windings through specially designed channels such as the hollow shaft and the ends of the stator windings. This direct contact cooling effectively shortens the heat transfer path and significantly improves heat dissipation efficiency.

[0004] Existing stator lamination oil circuit designs are mostly straight slot structures, with the cooling medium flowing in a laminar flow state. The main heat-generating area of ​​the stator lamination is the tooth pole position where the stator lamination and the coil are in contact. Due to the winding and shielding of the coil, the tooth pole area cannot dissipate heat quickly. To address this issue, a dual-circulation oil-cooled ultra-high efficiency permanent magnet motor stator structure is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a dual-cycle oil-cooled ultra-high efficiency permanent magnet motor stator structure, which aims to solve the problem in the prior art that "the tooth pole area of ​​the traditional stator lamination cannot dissipate heat quickly due to coil obstruction, resulting in excessively high temperature in the core heating area".

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a dual-cycle oil-cooled ultra-high efficiency permanent magnet motor stator structure, including lamination a, lamination b and lamination c, wherein mounting holes are provided through the outer sides of lamination a, lamination b and lamination c, and rivets are provided on the inner walls of the mounting holes; slots are provided on the outer sides of lamination a, lamination b and lamination c, and fasteners are inserted into the inner walls of the slots; and a heat dissipation component is provided on the rear side of lamination a.

[0007] The heat dissipation assembly includes an inlet hole that is opened through the front side of the lamination a. The rear side of lamination a and the front side of lamination b are provided with bent guide grooves. The inner walls of lamination b and lamination c are provided with multiple sets of flow grooves that communicate with the guide grooves. The inlet hole, guide grooves and flow grooves are connected in sequence to form an oil passage.

[0008] As a further description of the above technical solution:

[0009] The inner sides of laminations a, b, and c are provided with stator teeth for mounting coils.

[0010] As a further description of the above technical solution:

[0011] The guide groove is configured as a continuous V-shape.

[0012] As a further description of the above technical solution:

[0013] Multiple sets of the aforementioned flow grooves are disposed in the middle of the stator tooth poles.

[0014] As a further description of the above technical solution:

[0015] The front side of the inlet hole is set in a conical shape.

[0016] As a further description of the above technical solution:

[0017] Auxiliary grooves are evenly provided on the outer sides of the laminations a, b, and c.

[0018] As a further description of the above technical solution:

[0019] There are two sets of laminations a and b, which are symmetrically installed on the front and rear sides of lamination c.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, the injection of cooling oil can be accelerated through the conical inlet hole in the heat dissipation component, and the V-shaped continuous bending guide groove, together with the multiple sets of flow grooves in the middle of the stator tooth pole, allows the cooling oil to flow directly through the heat-generating core area of ​​the contact part between the coil and the tooth pole, which can directly remove the Joule heat generated by the coil being energized, thereby improving the heat dissipation effect of the device.

[0022] 2. In this utility model, the auxiliary grooves evenly opened on the outer side of the lamination can reduce the amount of material used, form a tiny channel between the outer side of the stator and the motor housing, allowing cooling oil to seep in, carrying away the heat from the outer side of the lamination, and further increasing the heat dissipation effect. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the overall device in this utility model;

[0024] Figure 2 This is a three-dimensional structural diagram of the disassembled integral device in this utility model;

[0025] Figure 3 This is a rear-view three-dimensional structural diagram of stator lamination a in this utility model.

[0026] Legend:

[0027] 1. Stamp a; 2. Stamp b; 3. Stamp c; 4. Slot; 5. Clip; 6. Mounting hole; 7. Rivet; 8. Heat dissipation assembly; 81. Inlet hole; 82. Guide groove; 83. Flow groove; 9. Auxiliary groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0029] Reference Figure 1 and Figure 2 This utility model provides an embodiment of a dual-cycle oil-cooled ultra-high-efficiency permanent magnet motor stator structure, including laminations a1, b2, and c3. Laminations a1 and b2 are arranged in two sets, symmetrically installed on the front and rear sides of lamination c3. Lamination c3 has multiple sets, and the stator length is adjusted by stacking thicknesses to adapt to different power requirements. Stator teeth for mounting coils are formed on the inner sides of laminations a1, b2, and c3. The stator teeth on the inner sides of the laminations are typically 12, 18, or 24 poles, which, after winding the coil, form a concentrated or distributed winding, generating a rotating magnetic field when energized. Mounting holes 6 with a diameter of 5 mm are formed through the outer sides of laminations a1, b2, and c3. ~8mm, used for positioning rivets 7 and ensuring the coaxiality of stator laminations. Rivets 7 are provided on the inner wall of mounting holes 6. They are made of silicon steel or stainless steel and are embedded into mounting holes 6 by cold riveting process. Axial clamping force is applied to fix multiple sets of laminations into a whole to prevent relative sliding between laminations during high-speed operation. The outer sides of laminations a1, b2 and c3 are provided with slots 4, which are U-shaped and 3-5mm deep. They form an interference fit with fasteners 5. Fasteners 5 are inserted into the inner wall of slots 4. They are made of elastic steel sheets such as 65Mn. After being inserted into slots 4, they hold the laminations tightly through their own elastic deformation to limit radial displacement. Together with rivets 7, they form a double fixation to improve the overall structure's vibration resistance. Heat dissipation components 8 are provided on the rear side of lamination a1.

[0030] Reference Figures 1-3The heat dissipation assembly 8 includes an inlet hole 81, which is formed through the front side of the lamination a1. The front side of the inlet hole 81 is tapered with a taper of 15°-20°, and the rear side transitions to a straight hole with a diameter of 8-12mm. Multiple sets of inlet holes 81 are formed and communicate with guide grooves 82 to allow cooling oil from inside the motor to be introduced into the inner wall of the guide grooves 82 for heat transfer. Bent guide grooves 82 are formed on the rear side of lamination a1 and the front side of lamination b2. The coils are arranged in a continuous V-shape to guide cooling oil into the inner wall of the area covered by the coil, achieving efficient heat dissipation. Multiple sets of flow grooves 83, connected to the guide groove 82, are formed on the inner walls of laminations b2 and c3. These flow grooves 83 are located in the middle of the stator teeth, with the flow grooves 83 of adjacent laminations c3 aligned and connected. This serves as a channel for cooling oil to flow through the middle of the stator teeth, penetrating the core heat-generating area and directly carrying away the Joule heat generated by the coil's energization. The multiple sets of flow grooves 83 are evenly distributed to ensure uniform heat dissipation for each tooth. Auxiliary grooves 9 are evenly formed on the outer sides of laminations a1, b2, and c3, reducing material usage by 8%–10%, lowering the motor's rotational inertia, and simultaneously forming a small channel between the outer side of the stator and the motor housing, allowing cooling oil to penetrate and carry away heat from the outer side of the laminations. The inlet hole 81, guide groove 82, and flow groove 83 are sequentially connected to form an oil passage.

[0031] Working principle: During use, laminations a1, b2, and c3 are stacked sequentially from front to back. After the fastener 5 is inserted into the slot 4, the laminations are held together by the elastic deformation of the 65Mn steel sheet, which restricts radial displacement. The number of laminations c3 is adjusted according to the motor power. The rivets 7 installed in the mounting holes 6 apply axial preload through cold riveting process, pressing the stacked laminations together as a whole to prevent relative sliding between the laminations during high-speed operation. The stator is then installed in the dual-cycle oil-cooled permanent magnet motor.

[0032] The external cooling oil is usually a special synthetic oil for motors with a thermal conductivity of 0.15 to 0.2 W / m·K. It is injected into the motor housing. The cooling oil is injected through the conical inlet 81 on the front side of the lamination a1. The conical structure of the inlet 81 uses the "Venturi effect" to accelerate the oil flow, which flows quickly to the guide groove 82 and squeezes out the cooling oil in the guide groove 82.

[0033] After the cooling oil enters the continuous V-shaped guide groove 82, it is guided to flow into the flow groove 83 on the inner wall of the lamination b2 and lamination c3. The flow groove 83 is precisely set on the inner wall of the stator tooth pole in the contact area between the coil and the rotor. The cooling oil directly washes the core heat-generating area. Multiple sets of flow grooves 83 evenly distribute the oil flow to each tooth pole, and quickly remove heat through heat conduction, so that the tooth pole temperature drops.

[0034] The auxiliary groove 9 on the outside of the lamination forms a micro-channel with a width of 2-4mm, allowing 10% of the cooling oil to seep into the space between the stator and the motor housing, carrying away about 10% of the heat on the outside of the lamination. The cooling oil that has completed heat dissipation flows out from the end of the lamination c3 and is recycled to the cooling system such as the oil pump and radiator through the oil circuit of the motor housing, forming a closed loop.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-circulation oil-cooled ultra-high efficiency permanent magnet motor stator structure comprising a punching sheet a (1), a punching sheet b (2) and a punching sheet c (3), characterized in that: Mounting holes (6) are provided through the outer sides of the punch a (1), punch b (2) and punch c (3), and rivets (7) are provided on the inner wall of the mounting holes (6). Slots (4) are provided on the outer sides of the punch a (1), punch b (2) and punch c (3), and fasteners (5) are inserted into the inner wall of the slots (4). A heat dissipation assembly (8) is provided on the rear side of the punch a (1). The heat dissipation assembly (8) includes an inlet hole (81), which is opened through the front side of the lamination a (1). The rear side of the lamination a (1) and the front side of the lamination b (2) are provided with bent guide grooves (82). The inner walls of the lamination b (2) and the lamination c (3) are provided with multiple sets of flow grooves (83) that communicate with the guide grooves (82). The inlet hole (81), the guide grooves (82) and the flow grooves (83) are connected in sequence to form an oil passage.

2. A dual -circuit oil-cooled ultra-high efficiency permanent magnet motor stator structure according to claim 1, characterized in that: The inner sides of the laminations a(1), b(2) and c(3) are provided with stator teeth for mounting coils.

3. The dual -cycle oil-cooled ultra-high efficiency permanent magnet motor stator structure of claim 1, wherein: The guide groove (82) is configured as a continuous V-shape.

4. The dual -cycle oil-cooled ultra-high efficiency permanent magnet motor stator structure of claim 1, wherein: Multiple sets of the flow grooves (83) are arranged in the middle of the stator tooth pole.

5. The dual -cycle oil-cooled ultra-high efficiency permanent magnet motor stator structure of claim 1, wherein: The front side of the inlet hole (81) is set in a conical shape.

6. A dual -cycle oil-cooled ultra-high efficiency permanent magnet motor stator structure according to claim 1, characterized in that: The outer sides of the blanks a (1), b (2) and c (3) are uniformly provided with auxiliary grooves (9).

7. The dual -cycle oil-cooled ultra-high efficiency permanent magnet motor stator structure of claim 1, wherein: Two sets of the laminations a(1) and b(2) are provided and are symmetrically installed on the front and rear sides of the lamination c(3).

Images