A stator assembly for a DC motor of an automotive cooling fan

Abstract

The utility model relates to motor stator combination structure technical field discloses a kind of stator combination structures for automobile cooling fan DC motor, including rotating shaft, the rotating shaft is used to transmit torque, and the rotating mechanical energy output generated by motor internal rotor is exported to external load;Stator core, the stator core is arranged at the rotating shaft outside, the stator core sleeve is set in the rotating shaft outer ring, and the stator core inside sleeve is provided with stator winding;Shell, the shell sleeve is set in the stator core outer wall, the shell inner wall and the stator core outer wall are contacted, and the shell outer wall is provided with magnetic conduction assembly.The utility model in, through the shell and the outer wall setting of its outer wall magnetic conduction assembly stable installation, solved the magnetic field dispersion in traditional automobile cooling fan DC motor stator combination structure, the problem of magnetic motive force waste, improved the driving efficiency of motor and torque output stability, adapt to the demand of high torque of automobile cooling fan.

Description

Technical Field

[0001] This utility model relates to the technical field of motor stator assembly structure, and in particular to a stator assembly structure for a DC motor used in automotive cooling fans. Background Technology

[0002] The automotive cooling fan is a critical heat dissipation component ensuring the normal operation of the car engine. Its operational reliability and drive performance directly depend on the stable operation of the DC motor. The stator assembly structure, as the core load-bearing and functional unit of the DC motor, plays a vital role in constructing the magnetic circuit, transmitting torque, and assisting in heat dissipation. In the complex operating environment of a car, the engine's heat dissipation requirements dynamically change with operating conditions, demanding that the cooling fan DC motor possess a continuous and stable torque output capability. The magnetic field performance and structural stability of the stator assembly structure directly affect the motor's adaptability to the cooling fan's drive requirements. Therefore, optimizing the stator assembly structure is an important direction for improving the overall performance of the automotive cooling system.

[0003] The existing stator structure for DC motors used in automotive cooling fans mainly consists of a shaft, stator core, stator windings, and outer casing. In its mechanical structure, the shaft passes through the center of the stator core, connecting the rotor and transmitting rotational mechanical energy. The stator core is formed by stacking silicon steel sheets, with slots on its surface for the stator windings to construct the basic magnetic circuit. The outer casing is fitted over the stator core, serving only to encapsulate and protect the internal components and provide mechanical fixation.

[0004] Existing stator structures for DC motors used in automotive cooling fans have significant flaws in their magnetic circuit design. Because traditional structures lack dedicated components for optimizing magnetic field distribution, the outer casing only provides basic support. This leads to a dispersion of the magnetic field generated by the stator windings after energization, resulting in significant magnetic leakage and increased magnetic reluctance, wasting a large amount of magnetomotive force. This directly reduces motor drive efficiency, causes significant torque output fluctuations, and fails to reliably meet the high torque demands of automotive cooling fans under high engine loads, thus affecting the cooling efficiency of the fan. Therefore, this paper proposes a stator assembly structure for automotive cooling fan DC motors to address these issues. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a stator assembly structure for a DC motor for an automotive cooling fan, aiming to improve the problem in the prior art where the magnetic field generated after the stator winding is energized tends to disperse around the winding, leading to increased magnetic reluctance in the magnetic circuit and a large amount of wasted magnetomotive force.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A stator assembly structure for a DC motor used in an automotive cooling fan includes:

[0008] A rotating shaft is used to transmit torque and output the rotational mechanical energy generated by the rotor inside the motor to an external load.

[0009] A stator core is disposed outside the rotating shaft and sleeved on the outer ring of the rotating shaft. A stator winding is sleeved inside the stator core.

[0010] The outer casing is fitted onto the outer wall of the stator core, the inner wall of the outer casing is in contact with the outer wall of the stator core, and the outer wall of the outer casing is provided with a magnetic conduction enhancement component;

[0011] The magnetic conduction enhancement component includes multiple magnetic rings, the inner walls of which are all fixedly connected to the outer wall of the stator winding. The magnetic rings are distributed in a linear array 1 on the outer wall of the stator winding, and a heat dissipation component is provided inside the stator winding.

[0012] The heat dissipation assembly includes multiple heat dissipation fins. The outer walls of the heat dissipation fins are all fixedly connected to the inner wall of the stator winding. The heat dissipation fins are distributed in a ring array inside the magnetic ring. The bottom of each heat dissipation fin is in contact with the outer wall of the stator core.

[0013] As a further description of the above technical solution:

[0014] The stator winding has multiple slots inside, which are arranged in a ring array inside the stator winding. The stator winding is used to engage with the outer wall of the stator core.

[0015] As a further description of the above technical solution:

[0016] The stator winding has multiple heat dissipation holes inside, which are arranged in a ring array inside the stator winding and are used for gas circulation.

[0017] As a further description of the above technical solution:

[0018] The rotating shaft is made of high-strength alloy steel, and the stator core is made of stacked silicon steel sheets, which are used to form the magnetic circuit and fix the winding.

[0019] As a further description of the above technical solution:

[0020] The housing is made of aluminum alloy and is used to encapsulate and protect the internal components and provide mechanical support.

[0021] As a further description of the above technical solution:

[0022] The stator winding is made of high-purity enameled copper wire and is used to generate a rotating magnetic field through current to drive the rotor. The magnetic ring is made of neodymium iron boron high-performance permanent magnet material and is used to establish a strong constant magnetic field on the rotor or stator.

[0023] As a further description of the above technical solution:

[0024] The heat dissipation fins are made of aluminum alloy and are in the shape of densely packed parallel thin sheets.

[0025] This utility model has the following beneficial effects:

[0026] 1. In this utility model, the magnetic enhancement component on the outer wall is stably installed by the outer shell. Then, multiple magnetic rings in the magnetic enhancement component are fixedly connected to the outer wall of the stator winding in a linear array under the support of the outer shell. This makes the periphery of the stator winding form a closed and uniform magnetic circuit, reducing magnetic resistance and leakage magnetic phenomena. The magnetic field strength and distribution uniformity are significantly improved, thereby optimizing the magnetic field performance of the motor. This solves the problems of magnetic field dispersion and magnetomotive force waste in the stator combination structure of traditional automotive cooling fan DC motors, improves the driving efficiency and torque output stability of the motor, and is suitable for the high torque requirements of automotive cooling fans.

[0027] 2. In this utility model, the heat generated by the stator core is quickly conducted to the fins by contacting the bottom of the heat dissipation fins with the outer wall of the stator core. The heat dissipation holes drive the air to circulate inside the stator windings to accelerate heat exchange. This allows the heat generated by the stator windings and stator core to be dissipated efficiently, thereby improving the heat dissipation efficiency of the stator assembly structure. This solves the problem of heat accumulation in the stator of the DC motor of the automotive cooling fan and improves the high temperature resistance and long-term operational reliability of the motor. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of a stator assembly structure for a DC motor used in an automotive cooling fan, as proposed in this utility model.

[0029] Figure 2 This is an exploded structural diagram of the housing of a stator assembly structure for a DC motor used in an automotive cooling fan, as proposed in this utility model.

[0030] Figure 3 This is a schematic diagram of the magnetic ring structure of a stator assembly structure for a DC motor used in an automotive cooling fan, as proposed in this utility model.

[0031] Figure 4 This is a cross-sectional structural diagram of the housing of a stator assembly structure for a DC motor used in an automotive cooling fan, as proposed in this utility model.

[0032] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0033] Legend:

[0034] 1. Shaft; 2. Stator core; 3. Housing; 4. Stator winding; 5. Slot; 6. Magnetic ring; 7. Heat dissipation holes; 8. Heat dissipation fins. Detailed Implementation

[0035] 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.

[0036] Reference Figure 1 - Figure 5 The present invention provides an embodiment of a stator assembly structure for a DC motor used in automotive cooling fans, comprising:

[0037] Shaft 1 is made of high-strength alloy steel, which has high structural strength and resistance to deformation. It is used to stably transmit torque and can avoid deformation due to force during torque transmission. This allows the rotational mechanical energy generated by the rotor inside the motor to be stably output to the external load, ensuring that the cooling fan continuously receives power.

[0038] The stator core 2 is made of stacked silicon steel sheets. The silicon steel sheet material can effectively reduce hysteresis loss and eddy current loss, which is conducive to building an efficient magnetic circuit. The stator core 2 is set outside the rotating shaft 1 and is sleeved on the outer ring of the rotating shaft 1, which can form a radial limit on the rotating shaft 1. At the same time, the stator winding 4 is sleeved inside the stator core 2, which can provide a stable installation foundation for the stator winding 4 and ensure the stability of the winding position.

[0039] The outer shell 3 is made of aluminum alloy, which combines lightweight and high thermal conductivity. The outer shell 3 is fitted on the outer wall of the stator core 2. The inner wall of the outer shell 3 is in contact with the outer wall of the stator core 2, which can tightly wrap the stator core 2 to prevent the internal components from shifting during motor operation. At the same time, it can help dissipate the heat generated by the stator core 2. The outer wall of the outer shell 3 is provided with a magnetic conduction enhancement component, which provides a stable mounting carrier for the magnetic conduction enhancement component.

[0040] The magnetic conduction enhancement component includes multiple magnetic rings 6. The magnetic rings 6 are made of neodymium iron boron high-performance permanent magnet material and have strong magnetic properties. The inner walls of the magnetic rings 6 are all fixedly connected to the outer wall of the stator winding 4, which can form a synergistic effect with the magnetic field generated by the stator winding 4 to enhance the magnetic field strength. The magnetic rings 6 are distributed in a linear array on the outer wall of the stator winding 4, which can make the magnetic field uniformly cover the periphery of the stator winding 4 and reduce the dispersion of the magnetic field. The stator winding 4 is equipped with a heat dissipation component to provide installation space for the heat dissipation component.

[0041] The heat dissipation component includes multiple heat dissipation fins 8, which are made of aluminum alloy. The high thermal conductivity of aluminum alloy allows for rapid heat conduction. The outer walls of the heat dissipation fins 8 are all fixedly connected to the inner wall of the stator winding 4, which can directly absorb the heat generated by the stator winding 4. The heat dissipation fins 8 are arranged in a ring array inside the magnetic ring 6, which can increase the contact area with the air and improve the heat dissipation efficiency. The bottom of the heat dissipation fins 8 is in contact with the outer wall of the stator core 2, which can simultaneously conduct the heat generated by the stator core 2 and avoid local heat accumulation.

[0042] Reference Figure 1 - Figure 5The stator winding 4 has multiple slots 5 inside, arranged in a ring array. This ring array arrangement ensures that the slots 5 evenly correspond to the protruding structures on the outer wall of the stator core 2, resulting in a tighter engagement between the stator winding 4 and the stator core 2. This prevents relative displacement between the two during motor operation, thereby ensuring the stability of the magnetic circuit structure. The stator winding 4 is used to engage with the outer wall of the stator core 2. The stator winding 4 also has multiple heat dissipation holes 7 inside, arranged in a ring array. This ring array design allows the heat dissipation holes 7 to evenly cover the stator winding 4. The internal region allows gas to circulate omnidirectionally within the stator winding 4, avoiding heat accumulation caused by poor local gas flow. Heat dissipation holes 7 facilitate gas flow. The rotating shaft 1 is made of high-strength alloy steel, which possesses high fatigue resistance and impact resistance, maintaining structural stability during long-term torque transmission and preventing deformation or breakage due to excessive force, ensuring stable output of rotating mechanical energy. The stator core 2 is made of laminated silicon steel sheets, which have low hysteresis loss and low eddy current loss characteristics. The lamination process further reduces energy loss in the magnetic circuit and improves magnetic circuit conductivity. Efficiency is achieved through the construction of the magnetic circuit and fixed windings. The outer casing 3 is made of aluminum alloy, which combines lightweight design with high thermal conductivity. The lightweight characteristic reduces the overall weight of the motor and the vehicle load, while the high thermal conductivity helps dissipate heat generated by internal components. It is used to encapsulate and protect internal components and provide mechanical support. The stator winding 4 is made of high-purity enameled copper wire. High-purity copper wire has low resistance, which reduces copper loss when current flows through it. The enameled layer has excellent insulation properties, which can prevent short circuits between windings and ensure stable current flow to generate a uniform rotating magnetic field. It is used to generate a rotating magnetic field to drive the motor. The rotor and magnetic ring 6 are made of neodymium iron boron high-performance permanent magnet material. Neodymium iron boron material has high magnetic density and strong magnetic stability, which can establish a high-intensity and long-term stable magnetic field around the stator or rotor, reduce magnetic leakage, and improve magnetic field utilization. It is used to establish a strong and constant magnetic field on the rotor or stator. The heat dissipation fins 8 are made of aluminum alloy. The high thermal conductivity of aluminum alloy can quickly absorb the heat of stator winding 4 and stator core 2. The heat dissipation fins 8 are in the shape of dense parallel thin plates. The dense structure can greatly increase the heat dissipation surface area, accelerate the heat exchange rate between heat and air, and avoid heat accumulation on the fins.

[0043] Working principle: When the motor is working, the stator winding 4 is first energized with current to generate a rotating magnetic field. This rotating magnetic field drives the rotor to rotate around the central axis of the shaft 1. During the rotation of the rotor, the shaft 1 rotates synchronously. When the shaft 1 rotates, the rotational mechanical energy generated by the rotor inside the motor is transferred to the external load, realizing torque transmission. At the same time, the stator core 2, which is sleeved on the outer ring of the shaft 1, remains fixed. The stator core 2, through the internal stator winding 4 and the rotating magnetic field, forms a complete magnetic circuit. The outer shell 3, which is sleeved on the outer wall of the stator core 2, remains fixed because its inner wall is in contact with the outer wall of the stator core 2. The outer shell 3 drives the magnetic conduction enhancement component on its outer wall to be stably positioned in a preset position. Multiple magnetic rings 6 in the magnetic conduction enhancement component are fixed in a linear array on the outer wall of the stator winding 4 under the support of the outer shell 3. Ring 6 maintains a stable position through its fixed connection with the outer wall of stator winding 4, thereby helping to optimize the magnetic field distribution around stator winding 4. At the same time, the heat dissipation components inside stator winding 4 work synchronously. The heat dissipation fins 8 arranged in a ring array in the heat dissipation components maintain their position through the fixed connection between the outer wall and the inner wall of stator winding 4. The bottom of the heat dissipation fins 8 is in contact with the outer wall of stator core 2. The heat generated by the operation of stator core 2 is transferred through contact, causing the temperature of heat dissipation fins 8 to rise. The heat is diffused on the heat dissipation fins 8. At the same time, multiple heat dissipation holes 7 opened inside stator winding 4 allow air circulation. The air flows in the heat dissipation holes 7, which accelerates the dissipation of heat. Ultimately, this ensures that the stator assembly structure can continue to operate under stable magnetic field and efficient heat dissipation conditions, meeting the working requirements of automotive cooling fan DC motors.

Claims

1. A stator assembly structure for a DC motor used in an automotive cooling fan, characterized in that, include: A rotating shaft (1) is used to transmit torque and output the rotational mechanical energy generated by the rotor inside the motor to an external load; Stator core (2), the stator core (2) is disposed outside the rotating shaft (1), the stator core (2) is sleeved on the outer ring of the rotating shaft (1), and a stator winding (4) is sleeved inside the stator core (2). The outer shell (3) is fitted onto the outer wall of the stator core (2), the inner wall of the outer shell (3) is in contact with the outer wall of the stator core (2), and the outer wall of the outer shell (3) is provided with a magnetic conduction enhancement component; The magnetic conduction enhancement component includes multiple magnetic rings (6), the inner walls of the magnetic rings (6) are all fixedly connected to the outer wall of the stator winding (4), the magnetic rings (6) are distributed in a linear array 1 on the outer wall of the stator winding (4), and a heat dissipation component is provided inside the stator winding (4). The heat dissipation assembly includes multiple heat dissipation fins (8). The outer walls of the heat dissipation fins (8) are all fixedly connected to the inner wall of the stator winding (4). The heat dissipation fins (8) are arranged in a ring array inside the magnetic ring (6). The bottom of the heat dissipation fins (8) is in contact with the outer wall of the stator core (2).

2. The stator assembly structure for a DC motor used in an automotive cooling fan according to claim 1, characterized in that: The stator winding (4) has multiple slots (5) inside, which are arranged in a ring array inside the stator winding (4). The stator winding (4) is used to engage the outer wall of the stator core (2).

3. The stator assembly structure for a DC motor used in an automotive cooling fan according to claim 1, characterized in that: The stator winding (4) has multiple heat dissipation holes (7) inside. The heat dissipation holes (7) are arranged in a ring array inside the stator winding (4) and are used for gas circulation.

4. The stator assembly structure for a DC motor used in an automotive cooling fan according to claim 1, characterized in that: The rotating shaft (1) is made of high-strength alloy steel, and the stator core (2) is made of silicon steel sheets stacked together, used to form a magnetic circuit and a fixed winding.

5. The stator assembly structure for a DC motor used in an automotive cooling fan according to claim 1, characterized in that: The outer casing (3) is made of aluminum alloy and is used to encapsulate and protect the internal components and provide mechanical support.

6. The stator assembly structure for a DC motor used in an automotive cooling fan according to claim 1, characterized in that: The stator winding (4) is made of high-purity enameled copper wire and is used to generate a rotating magnetic field through current to drive the rotor. The magnetic ring (6) is made of neodymium iron boron high-performance permanent magnet material and is used to establish a strong constant magnetic field on the rotor or stator.

7. The stator assembly structure for a DC motor used in an automotive cooling fan according to claim 1, characterized in that: The heat dissipation fins (8) are made of aluminum alloy and are in the shape of dense parallel thin sheets.

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