Heat dissipation structure of permanent magnet auxiliary synchronous reluctance motor

Abstract

The utility model discloses a heat dissipation structure of a permanent magnet auxiliary synchronous reluctance motor, which relates to the technical field of motor heat dissipation, and comprises a motor shaft and a casing, the motor shaft is mounted in the casing and rotates in the casing, a rotor is fixedly arranged on the motor shaft, a stator iron core is fixedly arranged in the casing, and the stator iron core is fixed on the casing. The rotor rotates in the stator iron core, a magnetic steel containing groove is formed in the rotor, heat dissipation holes are evenly distributed in the stator iron core, an inner fan is fixedly arranged on the motor shaft and located in the machine shell, and a plurality of sets of air flow channels with the air flowing function are arranged in the structure of the permanent magnet auxiliary synchronous reluctance motor. According to the permanent magnet auxiliary synchronous reluctance motor heat dissipation structure, three wind paths are matched for circulation, the internal heat dissipation capacity is improved, meanwhile, a water cooling flow channel is arranged in a motor shell, the heat dissipation capacity is further improved in a water cooling mode, and compared with an existing permanent magnet auxiliary synchronous reluctance motor heat dissipation structure, the motor temperature rise is lower, and the motor performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor heat dissipation, in particular to a heat dissipation structure of a permanent magnet assisted synchronous reluctance motor. Background Art

[0002] Synchronous reluctance motors (SRMs) are AC synchronous motors that follow the principle of minimum reluctance and utilize reluctance torque to drive the rotor. They are widely used in industrial drive applications due to their simple structure, ease of machining, smooth rotor surface, low losses, low cost, and high fault tolerance.

[0003] In modern industry, electric motors, as core components of power conversion, are crucial to the operation of the entire system through their performance and stability. In particular, with technological advancements, low-speed, high-torque synchronous reluctance motors (hereinafter referred to as "reluctance motors") have gained widespread application in various fields, including wind energy, shipping, and electric vehicles, due to their high efficiency and powerful torque output. However, as motor performance improves, heat dissipation issues have become increasingly prominent, becoming a key factor restricting their further development.

[0004] When a reluctance motor is in operation, its internal temperature rises rapidly due to electromagnetic induction and Joule heating generated by the current flowing through the conductors. Especially under low-speed, high-torque operating conditions, the motor needs to generate a larger magnetic field to drive the load, which exacerbates heat accumulation within the motor. Long-term high-temperature operation not only shortens the motor's lifespan but can also cause serious consequences such as insulation damage, winding deformation, and even motor burnout.

[0005] Traditional motor heat dissipation structures primarily rely on heat dissipation ribs on the outer periphery of the motor housing, increasing heat dissipation efficiency by increasing surface area. However, this cooling method is limited in its effectiveness on low-speed, high-torque reluctance motors. For one thing, the number and size of the heat dissipation ribs cannot be increased indefinitely due to motor size and weight limitations. Furthermore, the unique magnetic field distribution of reluctance motors results in uneven heat distribution within the motor, making it difficult to achieve effective heat transfer and dissipation using only external heat dissipation ribs.

[0006] Therefore, to address the heat dissipation issues of low-speed, high-torque reluctance motors, a more effective heat dissipation structure needs to be developed. This structure should have the following characteristics: first, it should fully utilize the motor's internal space to achieve efficient heat transfer and dissipation; second, it should be able to adapt to the uneven heat distribution within the motor, ensuring uniform and stable heat dissipation; and finally, it should be simple in structure, highly reliable, and easy to maintain to meet the needs of practical applications.

[0007] Researchers both domestically and internationally have proposed several design solutions for cooling structures in low-speed, high-torque reluctance motors. These include optimizing the shape and layout of cooling ribs, employing forced air or water cooling systems, and installing heat pipes or heat sinks within the motor. However, these solutions still have limitations in practical applications, such as low heat dissipation efficiency, complex structures, and difficult maintenance.

[0008] In summary, the heat dissipation problem of low-speed, high-torque synchronous reluctance motors is a technical challenge that needs to be solved urgently. To promote the further development of reluctance motors, it is necessary to conduct in-depth research on their heat dissipation mechanisms and explore more effective heat dissipation structures and technologies to meet the needs of practical applications. Utility Model Content

[0009] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a heat dissipation structure of a permanent magnet assisted synchronous reluctance motor, which solves the problems of low efficiency and low accuracy of vacuum bag detection.

[0010] Technical Solution

[0011] In order to solve the above problems, the technical solution provided by the present invention is:

[0012] A heat dissipation structure for a permanent magnet assisted synchronous reluctance motor includes a motor shaft and a casing. The motor shaft is mounted in the casing and rotates in the casing. A rotor is fixedly provided on the motor shaft. A stator core is fixedly provided in the casing. The rotor rotates in the stator core. A magnetic steel receiving slot is provided in the rotor. Heat dissipation holes are evenly distributed on the stator core. An internal fan is fixedly provided on the motor shaft and located in the casing.

[0013] Furthermore, a water cooling channel groove is provided in the casing.

[0014] Furthermore, the water-cooling channel groove is a spiral water-cooling channel.

[0015] Furthermore, the housing is provided with a water-cooling interface connected to the water-cooling channel groove, and the water-cooling interface is provided at both ends of the water-cooling channel groove.

[0016] Furthermore, the water cooling interface is a water inlet and a water outlet, and the water inlet and the water outlet are used to connect to external water circulation equipment.

[0017] Furthermore, a magnetic steel is installed in the magnetic steel receiving groove.

[0018] Furthermore, the magnetic steel containing slot is empty.

[0019] Furthermore, coil slots are provided in the stator core, and the coil slots are arranged inside the heat dissipation holes.

[0020] Furthermore, the inner fan is a centrifugal impeller.

[0021] Beneficial effects

[0022] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0023] This novel method uses a plurality of air flow channels with air flow functions to be arranged in the structure of the permanent magnet assisted synchronous reluctance motor. With the assistance of the internal fan, the ventilation holes on the stator core, the gaps between the stator and the rotor, and the excess space in the magnetic steel slot increase the internal fluid circulation of the motor and circulate in conjunction with three air paths to improve the internal heat dissipation capacity. At the same time, a water cooling channel is arranged in the motor casing, and the heat dissipation capacity is further improved by water cooling. Compared with the existing permanent magnet assisted synchronous reluctance motor heat dissipation structure, the motor temperature rise of the present invention is lower, thereby improving the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0025] Figure 2 This is a transverse cross-sectional view of Example 1 of the present utility model;

[0026] Figure 3 This is a longitudinal sectional view of Example 1 of the present utility model. DETAILED DESCRIPTION

[0027] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] Combined with attachment Figure 1-3 A heat dissipation structure of a permanent magnet assisted synchronous reluctance motor, that is, an application in a permanent magnet assisted synchronous reluctance motor, consists of a motor shaft 10, a casing 11, a rotor 12, a magnet 20 located in the rotor 12, a stator core 13, and an internal fan 14.

[0030] The motor shaft 10 is rotatably mounted in the housing 11 . The housing 11 is provided with bearings. The housing 11 mounts the motor shaft 10 inside via the bearings and does not restrict the rotation of the motor shaft 10 .

[0031] The stator core 13 is fixedly mounted on the housing 11, and the rotor 12 is fixedly mounted on the motor shaft 10. The stator core 13 and the rotor 12 are arranged correspondingly, and the rotor 12 rotates in the stator core 13. The rotor 12 and the stator core 13 are both centrally arranged, and the transverse center lines of the rotor 12 and the stator core 13 are on the same straight line. In a general embodiment, the stator core 13 is slightly longer than the rotor 12.

[0032] A gap is provided between the rotor 12 and the stator core 13 . The gap between the rotor 12 and the stator core 13 is not only used to meet the high-speed rotation and movement of the rotor 12 , but also serves as a channel for gas flow.

[0033] The stator core 13 is provided with heat dissipation holes 15 and coil slots 16. The coil slots 16 are arranged inside the heat dissipation holes 15. The coil slots 16 and the heat dissipation holes 15 are both arranged in an annular shape. The coil slots 16 and the heat dissipation holes 15 are evenly distributed. The spacing between adjacent coil slots 16 or adjacent heat dissipation holes 15 is equal. The circular ring formed by the coil slots 16 is arranged inside the circular ring formed by the heat dissipation holes 15. The coil slots 16 and the heat dissipation holes 15 are set separately and do not need to meet a one-to-one correspondence.

[0034] The heat dissipation holes 15 pass through the stator core 13 in a transverse direction. The heat dissipation holes 15 are used to provide passages for air flow on both sides of the stator core 13 in the housing 11 .

[0035] The coil slot 16 is used to install the stator coil. The shape of the coil slot 16 is not limited, and it is preferred to facilitate installation and convenient use of the coil. The arrangement of the coils in the coil slot 16 is changed according to actual needs.

[0036] The rotor 12 is provided with magnetic steel receiving slots 17, which are regularly distributed in multiple groups. Multiple magnetic steel receiving slots 17 are stacked on the rotor 12 outside the motor shaft 10. Each group of magnetic steel receiving slots 17 is composed of multiple single magnetic steel receiving slots 17. The center lines of the magnetic steel receiving slots 17 in the same group are the same straight line. Multiple groups of magnetic steel receiving slots 17 are arranged in a cross shape around the motor shaft. The magnetic steel receiving slots 17 on any side of the cross are stacked, and each side is provided with multiple magnetic steel receiving slots 17. In the cross-shaped magnetic steel receiving slots 17, the center lines of the magnetic steel receiving slots 17 in different directions are perpendicular, and the center lines of the magnetic steel receiving slots 17 in the same direction are on the same straight line.

[0037] A magnet 20 is fixed in the magnet receiving groove 17. The shape of the magnet receiving groove 17 is not limited, but must meet the design principle of the reluctance motor and be able to stably install the magnet 20. After the magnet 20 is installed in the magnet receiving groove 17, extra space is reserved for ventilation. Compared with the traditional permanent magnet motor, the internal air magnetic barrier of the reluctance motor can act as a ventilation hole to improve heat dissipation.

[0038] An internal fan 14 is also provided on the motor shaft 10. The internal fan 14 is preferably a centrifugal impeller. The internal fan 14 is used to coordinate the gas flow in the casing 11 after following the rotation of the motor shaft 10, so that the air flow in the motor can circulate, thereby achieving better heat dissipation effect. The internal fan 14 uses a centrifugal impeller to guide air from the magnetic steel receiving groove 17 of the rotor 12 through the internal fan 14 into the heat dissipation hole, and then enter the magnetic steel receiving groove 17 again to form a complete cycle. In conjunction with the water-cooling structure of the casing 11, the air inside the casing 11 is continuously exchanged with heat, and the air gap between the stator core 13 and the rotor 12 can also be used for air flow.

[0039] A water-cooling flow channel groove 18 is provided in the casing 11. The water-cooling flow channel 18 surrounds the entire casing 11 to perform heat exchange and cooling on the entire casing 11. The water-cooling flow channel 18 is preferably a spiral water-cooling flow channel, and the cooling liquid flows in the water-cooling flow channel 18. In other embodiments, the water-cooling flow channel 18 can also be a flow channel of other shapes, which must be able to perform stable and efficient heat exchange with the casing, and at the same time facilitate the circulation of the internal cooling liquid.

[0040] The casing 11 is provided with water cooling interfaces 19 at both ends of the water cooling channel groove 18. The water cooling interface 19 is divided into a water inlet and a water outlet. The water inlet and the water outlet are connected to an external water circulation device. When the motor is in use, the water circulation device can drive the coolant to flow in the water cooling flow groove 18, that is, circulate in the spiral water cooling channel, thereby achieving the purpose of cooling the casing 11 as a whole.

[0041] When the motor is in use, the coil is energized, and the motor shaft 10 starts to rotate. The motor shaft 10 starts to rotate, thereby driving the internal fan 11 to rotate. The internal fan 11 rotates continuously to guide the high-temperature gas inside the rotor 12 out. The high-temperature gas inside the rotor 12 passes through the internal fan 11 and enters the stator core 13. Since the stator core 13 is fixed on the outer shell 11 and tightly fixed to the outer shell 11, when the motor is in use, the water-cooling flow channel groove 18 on the casing 11 is opened to allow the internal coolant to flow. The coolant carries away the heat from the casing 11, and the casing 11 exchanges the hot air brought from the rotor 12 through the stator core 13. At this time, through two heat exchanges, the heat dissipation work inside the casing of the permanent magnet assisted synchronous reluctance motor is completed.

[0042] Example 2

[0043] The motor heat dissipation structure disclosed in the present application can also be applied to synchronous reluctance motors. Compared with Example 1, Example 2 can remove the magnet 20 in the magnet receiving slot 17 in the rotor 12 of Example 1, or directly replace the magnet receiving slot 17 with a heat dissipation channel, thereby converting the permanent magnet assisted synchronous reluctance motor into a synchronous reluctance motor, thereby completing the heat dissipation of the synchronous reluctance motor.

[0044] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A heat dissipation structure of a permanent magnet assisted synchronous reluctance motor, characterized in that: The invention comprises a motor shaft and a casing, wherein the motor shaft is installed in the casing and rotates in the casing, a rotor is fixed on the motor shaft, a stator core is fixed in the casing, the rotor rotates in the stator core, a magnetic steel receiving slot is provided in the rotor, heat dissipation holes are evenly distributed on the stator core, and an internal fan is fixed on the motor shaft in the casing.

2. The heat dissipation structure of a permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that: A water cooling channel groove is provided in the casing.

3. The heat dissipation structure of a permanent magnet assisted synchronous reluctance motor according to claim 2, characterized in that: The water-cooling channel groove is a spiral water-cooling channel.

4. The heat dissipation structure of a permanent magnet assisted synchronous reluctance motor according to claim 2, characterized in that: The housing is provided with a water cooling interface which is in communication with the water cooling channel groove, and the water cooling interface is provided at both ends of the water cooling channel groove.

5. The heat dissipation structure of a permanent magnet assisted synchronous reluctance motor according to claim 4, characterized in that: The water cooling interface is a water inlet and a water outlet, and the water inlet and the water outlet are used to connect to an external water circulation device.

6. The heat dissipation structure of a permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that: A magnetic steel is installed in the magnetic steel receiving groove.

7. The heat dissipation structure of a permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that: The magnetic steel receiving slot is empty.

8. The heat dissipation structure of a permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that: Coil slots are provided in the stator core, and the coil slots are arranged inside the heat dissipation holes.

9. The heat dissipation structure of a permanent magnet assisted synchronous reluctance motor according to claim 1, characterized in that: The inner fan is a centrifugal impeller.

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