A ribbed sector louver, motor, manufacturing method and optimization design method

Abstract

The application provides a rib type fan-shaped ventilation slot sheet, a motor, a manufacturing method and an optimization design method, and belongs to the technical field of motors. The application solves the problem of small heat dissipation area, large thermal resistance and high temperature rise of a stator core of an existing motor. The ventilation slot sheet comprises a fan-shaped sheet, tooth part ventilation slot steels, yoke part ventilation slot steels, tooth inner rib sheets, tooth edge rib sheets and yoke part rib sheets. The tooth inner rib sheets are arranged between two adjacent tooth part ventilation slot steels, the tooth edge rib sheets are arranged between the tooth part ventilation slot steels and coil embedding grooves, the yoke part rib sheets are arranged on both sides of the yoke part ventilation slot steels, and the heights of all the rib sheets are smaller than the height of the ventilation slot steels. The application increases the heat dissipation area and reduces the thermal resistance by adding the rib sheets, so that the temperature rise of the motor is effectively reduced. The application further provides a manufacturing method of the ventilation slot sheet and an optimization design method based on three-dimensional fluid-solid coupling calculation.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and in particular relates to a ribbed fan-shaped ventilation slot, a motor, a manufacturing method, and an optimized design method. Background Technology

[0002] The stator core of the motor with radial ventilation is assembled from components such as fan-shaped silicon steel sheets, ventilation slots, positioning ribs, tooth pressure plates, tensioning screws and fixing plates. The ventilation slots and adjacent upper and lower fan-shaped silicon steel sheets form the stator core ventilation groove. Cooling air flows from the inner diameter of the stator through the ventilation groove to the outer diameter of the stator to cool the stator core and stator coils.

[0003] Existing ventilation slots consist of fan-shaped plates and ventilation channel steel. The toothed section typically has two ventilation channel steels, while the yoke section has one. Heat flow on the core is primarily carried away through convection between the core surface and the air in the ventilation channels. The thermal resistance between the ventilation slots and the air is a key factor limiting the motor's temperature rise.

[0004] To reduce this thermal resistance, there are generally two approaches: one is to increase the air velocity within the ventilation channel to improve the heat transfer coefficient; the other is to increase the heat dissipation area to reduce thermal resistance. The former is limited by the power consumption of the fan and the resistance of the airflow path, leaving limited room for improvement; the latter is constrained by the existing structure of the ventilation slots, and simply relying on the surface area of ​​the channel steel itself is insufficient to achieve a significant increase. With the continuous increase in the capacity of large hydro-generators and other units, the heat generation of the stator core is increasing, and the heat dissipation capacity of the existing ventilation slots is becoming increasingly inadequate, necessitating an improvement to the ventilation slot structure. Summary of the Invention

[0005] In view of this, the present invention aims to propose a ribbed fan-shaped ventilation slot, a motor, a manufacturing method, and an optimized design method to solve the problem that the existing motor ventilation slot has a small heat dissipation area and high thermal resistance, resulting in excessive temperature rise of the stator core.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a ribbed fan-shaped ventilation slot for the stator core of an electric motor, comprising a fan-shaped plate, a toothed ventilation slot steel, a yoke ventilation slot steel, an internal toothed rib, an edge toothed rib, and a yoke rib; the toothed ventilation slot steel is disposed on the toothed portion of the fan-shaped plate, and the yoke ventilation slot steel is disposed on the yoke portion of the fan-shaped plate; the internal toothed rib is disposed between two adjacent toothed ventilation slot steels; the edge toothed rib is disposed between the toothed ventilation slot steel and the coil slot of the fan-shaped plate; the yoke rib is disposed on both sides of the yoke ventilation slot steel; the height of the internal toothed rib, the edge toothed rib, and the yoke rib is less than the height of the toothed ventilation slot steel and the yoke ventilation slot steel.

[0007] Furthermore, the toothed ventilation channel steel extends from the inner circle of the fan-shaped plate to the outer circle of the fan-shaped plate, and the yoke ventilation channel steel extends from the bottom of the coil groove of the fan-shaped plate to the outer circle of the fan-shaped plate.

[0008] Furthermore, both the inner tooth rib and the edge tooth rib extend from the inner circle of the fan-shaped piece to the outer circle of the fan-shaped piece, and the yoke rib extends from the bottom of the coil groove of the fan-shaped piece to the outer circle of the fan-shaped piece.

[0009] Furthermore, a gap of 0.1mm to 10mm is left between the two sides of the toothed ventilation channel steel and the edge of the fan-shaped plate.

[0010] Furthermore, the height of the inner tooth rib, the edge tooth rib, and the yoke rib is 0.1mm to 0.5mm less than the height of the tooth ventilation channel steel and the yoke ventilation channel steel.

[0011] Furthermore, the inner tooth ribs, edge tooth ribs, and yoke ribs are all straight-winged ribs or corrugated ribs.

[0012] Furthermore, the number of internal tooth ribs N, the number of tooth edge ribs M, and the number of yoke ribs L are all integers from 0 to 50; when N, M, or L is 0, it indicates that no corresponding rib is provided in that part; the ribs located at the joint of two adjacent ventilation slots are cancelled.

[0013] An electric motor includes a stator core, the stator core including ribbed fan-shaped ventilation slots.

[0014] A method for manufacturing a ribbed fan-shaped ventilation slot includes the following steps: S1: Processing sector-shaped pieces; S2: Fix the toothed ventilation channel steel in the toothed part of the fan-shaped plate, fix the yoke ventilation channel steel in the yoke part of the fan-shaped plate, set a corresponding number of toothed internal ribs between two adjacent toothed ventilation channel steels, set a corresponding number of toothed edge ribs between the toothed ventilation channel steel and the coil groove of the fan-shaped plate, and set a corresponding number of yoke ribs on both sides of the yoke ventilation channel steel.

[0015] An optimized design method for ribbed fan-shaped ventilation slots includes the following steps: S1: Establish a calculation model. The calculation model includes the core, insulation, coil, ventilation channel steel and ventilation slot plate. The calculation area consists of one tooth, two half slots, one core segment length and two adjacent ventilation channels. S2: Input motor operating parameters and material thermophysical property parameters, including copper loss, iron loss and ventilation trench air volume; S3: Set boundary conditions and use the three-dimensional fluid-structure interaction method to calculate the fluid field in the ventilation duct and the temperature field in the calculation area; S4: Adjust the width, height, length and number of the internal tooth ribs, edge tooth ribs and yoke ribs, and iterate through steps S1 to S3 to obtain the temperature rise calculation results under different structural parameters; S5: Compare the temperature rise calculation results under different structural parameters, and select the structural parameters that meet the preset temperature rise threshold as the final design scheme. The structural parameters include the material, geometric dimensions, quantity of the internal tooth ribs, tooth edge ribs and yoke ribs, as well as the material and thickness of the fan-shaped plates.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention effectively increases the heat dissipation area and reduces the thermal resistance by rationally arranging the internal tooth ribs, tooth edge ribs and yoke ribs on the fan-shaped plate. This solves the technical problem of excessive stator core temperature rise caused by the small heat dissipation area and large thermal resistance of the existing ventilation slot plate, and significantly improves the cooling performance and operational reliability of the motor. 2. The present invention provides an internal tooth rib between two adjacent teeth of the ventilation channel steel of the fan-shaped plate, a tooth edge rib between the ventilation channel steel of the tooth and the coil slot, and a yoke rib on both sides of the ventilation channel steel of the yoke. These ribs are attached to the surface of the fan-shaped plate, so that the area that originally relied only on the plane of the fan-shaped plate for heat dissipation has additional heat dissipation area on the side of the ribs, thereby increasing the heat dissipation area of ​​the entire ventilation channel plate by a factor of two, fundamentally solving the problem of the small heat dissipation area of ​​the existing ventilation channel plates. 3. This invention reduces the thermal resistance between the ventilation slot and the cooling air. Due to the increased heat dissipation area, under the same wind speed conditions, more heat is transferred from the iron core to the air per unit time, and the thermal resistance is reduced accordingly. At the same time, the arrangement of the fins changes the airflow direction in the ventilation channel, which increases the local wind speed to a certain extent and further enhances the convective heat transfer effect. The two aspects work together to significantly reduce the thermal resistance between the ventilation slot and the air, effectively reducing the temperature rise of the motor. 4. The number N, M, and L of the tooth inner ribs, tooth edge ribs, and yoke ribs of this invention can be selected within an integer range of 0 to 50. The height, thickness, length, type, and material of the ribs can all be adjusted according to the cost-effectiveness of the specific motor design. Through the optimization design method, the optimal rib configuration scheme can be quickly obtained for different motor capacities, cooling conditions, and cost constraints, taking into account both heat dissipation performance and economy. 5. This invention is not only applicable to various radial ventilation motors, especially large hydro generators, but its manufacturing method is also simple and easy to implement. It can be achieved simply by adding welding or fixing ribs to the fan-shaped plates of the existing ventilation slots. There is no need to make significant changes to the overall structure of the motor, which has good engineering practicality and promotion value. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a top view of the structure of a ribbed fan-shaped ventilation slot according to the present invention; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point BB; Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure at point AA.

[0018] In the picture: 1. Fan-shaped plate; 2. Tooth ventilation channel steel; 3. Yoke ventilation channel steel; 4. Inner tooth rib; 5. Tooth edge rib; 6. Yoke rib. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0020] Detailed Implementation Method 1: See Figure 1-3This embodiment describes a ribbed fan-shaped ventilation slot for a motor stator core, comprising a fan-shaped plate 1, a toothed ventilation channel steel 2, a yoke ventilation channel steel 3, internal toothed ribs 4, edge toothed ribs 5, and yoke ribs 6. The fan-shaped plate 1 is the main body of the ventilation slot, made of silicon steel sheet. The fan-shaped plate 1 is fan-shaped, and multiple fan-shaped plates are assembled to form a complete annular stator core. Coil slots are provided on the fan-shaped plate 1 for placing stator coils. The toothed ventilation channel steel 2 is located on the toothed portion of the fan-shaped plate 1, and the yoke ventilation channel steel 3 is located on the yoke portion of the fan-shaped plate 1. The toothed portion refers to the protruding part between two adjacent coil slots on the fan-shaped plate 1, and the yoke portion refers to the coil slot. Outside the bottom of the slot, near the outer circle of the fan-shaped plate, the toothed ventilation channel steel 2 serves as a supporting structure for forming ventilation channels during stator core stacking, ensuring uniform height of the ventilation channels. It also separates adjacent fan-shaped silicon steel plates in the axial direction, allowing cooling air to circulate within the ventilation channels. The toothed ventilation channel steel 2 is typically made of non-magnetic steel to reduce eddy current losses. The yoke ventilation channel steel 3 functions similarly to the toothed ventilation channel steel 2, providing support and forming ventilation channels in the yoke area to ensure smooth airflow. The internal tooth ribs 4 are located between two adjacent toothed ventilation channel steels 2, increasing the heat dissipation in the toothed area. Regarding the heat dissipation area, without fins, heat dissipation in the toothed region relies solely on the surface of the fan-shaped plate 1. With the internal tooth fins 4, both sides of the internal tooth fins 4 participate in heat exchange, thereby increasing the heat dissipation area. Simultaneously, the presence of the internal tooth fins 4 alters the airflow pattern within the ventilation channel, causing turbulence between the fins and thus improving the convective heat transfer coefficient. The tooth-edge fins 5 are located between the toothed ventilation channel steel 2 and the coil slot of the fan-shaped plate 1. The tooth-edge fins 5 fully utilize the gap between the toothed ventilation channel steel 2 and the coil slot, further expanding the heat dissipation area in this region. The effective heat dissipation area increases after the tooth-edge fins 5 are installed. The yoke fins... The 6 ribs are located on both sides of the yoke ventilation channel steel 3. The yoke ribs 6 are used to increase the heat dissipation area of ​​the yoke region. Similar to the tooth region, the yoke region also has a large heat dissipation requirement. The setting of the yoke ribs 6 improves the heat dissipation capacity of the yoke region. The height of the tooth inner ribs 4, tooth edge ribs 5 and yoke ribs 6 is smaller than the height of the tooth ventilation channel steel 2 and the yoke ventilation channel steel 3. The height of the ribs is lower than that of the ventilation channel steel, which can avoid direct contact between the ribs and the adjacent fan-shaped silicon steel sheets when the stator core is stacked, prevent the silicon steel sheets from deforming or being damaged due to pressure concentration, reduce the additional losses caused by the ribs forming a loop, and also ensure the uniformity of the height of the ventilation channel.

[0021] The tooth ventilation channel steel 2 extends from the inner circle of the fan-shaped plate 1 to the outer circle of the fan-shaped plate 1. The tooth ventilation channel steel 2 runs through the entire length of the tooth, which can provide uniform support throughout the entire tooth range and allow cooling air to enter from the inner circle of the stator and flow along the entire length of the tooth, so as to achieve uniform cooling of the entire length of the tooth. The yoke ventilation channel steel 3 extends from the bottom of the coil slot of the fan-shaped plate 1 to the outer circle of the fan-shaped plate 1. The yoke area extends outward from the bottom of the coil slot to the outer circle. The yoke ventilation channel steel 3 covers the entire length of this area, ensuring that the cooling air in the yoke area can flow from the bottom of the slot to the outer circle outlet, so as to achieve full-length cooling of the yoke area.

[0022] The inner tooth rib 4 and the outer tooth rib 5 both extend from the inner circle of the fan-shaped plate 1 to the outer circle of the fan-shaped plate 1. The inner tooth rib 4 and the outer tooth rib 5 run through the entire length of the tooth, which can increase the heat dissipation area throughout the entire length of the tooth, thereby improving the heat dissipation capacity at any position of the tooth and avoiding local overheating. The yoke rib 6 extends from the bottom of the coil slot of the fan-shaped plate 1 to the outer circle of the fan-shaped plate 1. The yoke rib 6 covers the entire length of the yoke area, thereby enhancing the heat dissipation capacity of the yoke area along the length direction.

[0023] A gap of 0.1mm to 10mm is left between the two sides of the toothed ventilation channel steel 2 and the edge of the fan-shaped plate 1. The reserved gap can avoid stress concentration caused by direct contact between the ventilation channel steel and the edge of the fan-shaped plate 1. At the same time, the gap also provides operating space for welding or fixing operations. In addition, the existence of the gap is conducive to the flow of cooling air on both sides of the ventilation channel steel and reduces the dead zone of flow.

[0024] The height of the inner tooth rib 4, the edge tooth rib 5, and the yoke rib 6 is 0.1mm to 0.5mm less than the height of the tooth ventilation channel steel 2 and the yoke ventilation channel steel 3. The height difference of 0.1mm to 0.5mm is used to ensure that the ribs do not contact the adjacent sector-shaped silicon steel sheets when the stator core is stacked, while also preventing the waste of effective heat dissipation area due to excessive height difference.

[0025] The toothed ribs 4, toothed edge ribs 5, and yoke ribs 6 are all straight-wing ribs or corrugated ribs. Straight-wing ribs have a simple structure, are easy to process and fix, and have a low manufacturing cost. Corrugated ribs are characterized by a wavy surface. Compared with straight-wing ribs, corrugated ribs have a larger actual surface area under the same projected area, thus having a better heat dissipation effect. At the same time, the corrugated structure has a stronger disturbance effect on airflow, which helps to break the laminar boundary layer and further improve the heat transfer coefficient. The specific type of rib used is selected based on the heat dissipation requirements of the motor and the manufacturing cost.

[0026] The number N of the internal tooth ribs 4, the number M of the tooth edge ribs 5, and the number L of the yoke ribs 6 are all integers from 0 to 50. When N, M, or L is 0, it means that no corresponding rib is set in that part. The number of ribs directly affects the size of the heat dissipation area and the flow resistance in the ventilation channel. The more ribs there are, the larger the heat dissipation area will be, but at the same time, the ventilation resistance will increase, resulting in a decrease in air volume. Therefore, it is necessary to optimize and determine the optimal number of ribs. The range of 0 to 50 covers the common requirements from small motors to large hydro generators. The ribs located at the joint of two adjacent ventilation slots are eliminated. When two adjacent ventilation slots are spliced, a gap will be formed at the joint. If a rib is still set at the joint, the rib will be cut off by the splicing seam and will not play a complete heat dissipation role. Instead, it may affect the airflow due to the unevenness of the break. Therefore, eliminating a rib at the joint can avoid the above problems.

[0027] Detailed Implementation Method 2: See Figure 1-3 In this embodiment, the fan-shaped plate 1 is provided with two toothed ventilation channel steels 2 and one yoke ventilation channel steel 3. The number of toothed inner ribs 4 is N, which is 3; the number of toothed edge ribs 5 is M, which is 1; and the number of yoke ribs 6 is L, which is 2 on each side. That is, a total of 4 yoke ribs 6 are provided on both sides of the yoke ventilation channel steel 3.

[0028] An electric motor includes a stator core, the stator core including ribbed fan-shaped ventilation slots. The motor can be a steam turbine generator, a hydro turbine generator, or other motors that use a radial ventilation system. Due to the use of the ribbed fan-shaped ventilation slots of the present invention, the heat dissipation capacity of the stator core of the motor is improved, the temperature rise is lower under the same operating conditions, and the operating reliability and service life are improved.

[0029] A method for manufacturing a ribbed fan-shaped ventilation slot includes the following steps: S1: Processing fan-shaped plate 1, which is formed by stamping or laser cutting process, and pre-opening coil slots and other necessary holes on it; S2: Fix the toothed ventilation channel steel 2 to the toothed part of the fan-shaped plate 1, and fix the yoke ventilation channel steel 3 to the yoke part of the fan-shaped plate 1. The fixing method can be resistance welding, argon arc welding or riveting, etc., to ensure that the ventilation channel steel and the fan-shaped plate 1 are firmly connected and have good contact to facilitate heat conduction; set a corresponding number of toothed ribs 4 between two adjacent toothed ventilation channel steels 2, set a corresponding number of toothed edge ribs 5 between the toothed ventilation channel steel 2 and the coil groove of the fan-shaped plate 1, and set a corresponding number of yoke ribs 6 on both sides of the yoke ventilation channel steel 3. The fixing method of the ribs is similar to that of the ventilation channel steel, which can be welding or riveting. When installing, pay attention to controlling the height of the ribs to ensure that they are 0.1mm to 0.5mm lower than the height of the ventilation channel steel.

[0030] Specific Embodiment 3: An optimized design method for a ribbed fan-shaped ventilation slot, comprising the following steps: S1: Establish a calculation model. The calculation model includes the iron core, insulation, coil, ventilation channel steel and ventilation slot plate. The calculation area consists of one tooth, two half slots, one iron core segment length and two adjacent ventilation channels. This calculation area is the smallest periodic unit of the stator iron core. The analysis of this unit can represent the thermal characteristics of the entire iron core. S2: Input motor operating parameters and material thermophysical property parameters. The operating parameters include copper loss, iron loss and ventilation channel air volume. The material thermophysical property parameters include thermal conductivity, specific heat capacity and density, etc. S3: Set boundary conditions and use the three-dimensional fluid-structure interaction method to calculate the fluid field in the ventilation duct and the temperature field in the calculation area. The three-dimensional fluid-structure interaction method can simultaneously consider the heat conduction in the solid area, i.e., the iron core, coil, ventilation slot, etc., and the convective heat transfer in the fluid area, accurately simulating the actual heat transfer process. S4: Adjust the width, height, length and number of the inner tooth rib 4, the tooth edge rib 5 and the yoke rib 6, and iteratively execute steps S1 to S3 to obtain the temperature rise calculation results under different structural parameters; S5: Compare the temperature rise calculation results under different structural parameters, and select the structural parameters that meet the preset temperature rise threshold as the final design scheme. The structural parameters include the material, geometric dimensions and quantity of the inner tooth rib 4, the tooth edge rib 5 and the yoke rib 6, as well as the material and thickness of the fan-shaped plate 1.

[0031] To verify the technical effect of the present invention, the inventors conducted specific simulation calculations. For a carbon steel rib with a thickness of 0.3 mm and a height of 4.5 mm, under the condition of an inlet air temperature of 44℃, different rib spacing schemes were compared and calculated. The results are shown in the table below:

[0032] As can be seen from the data in the table, compared with the structure without ribs, after adding the ribs described in this invention, the average temperature of the ventilation slot is significantly reduced from 61.58℃ to below 51.35℃. The optimal solution is when the rib spacing is 1.5mm, the average temperature drops to 48.67℃, and the temperature reduction exceeds 12℃. This proves that by increasing the heat dissipation area and optimizing airflow disturbance, the motor temperature rise can be effectively reduced.

[0033] The specific embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A ribbed fan-shaped ventilation slot for use in the stator core of an electric motor, characterized in that: It includes a fan-shaped plate (1), a toothed ventilation channel steel (2), a yoke ventilation channel steel (3), an inner tooth rib (4), an outer tooth rib (5), and a yoke rib (6); the toothed ventilation channel steel (2) is located on the toothed part of the fan-shaped plate (1), and the yoke ventilation channel steel (3) is located on the yoke of the fan-shaped plate (1); the inner tooth rib (4) is located between two adjacent toothed ventilation channel steels (2); the outer tooth rib (5) is located between the toothed ventilation channel steel (2) and the coil groove of the fan-shaped plate (1); the yoke rib (6) is located on both sides of the yoke ventilation channel steel (3); the height of the inner tooth rib (4), the outer tooth rib (5), and the yoke rib (6) is less than the height of the toothed ventilation channel steel (2) and the yoke ventilation channel steel (3).

2. The ribbed fan-shaped ventilation slot plate according to claim 1, characterized in that: The toothed ventilation channel steel (2) extends from the inner circle of the fan-shaped plate (1) to the outer circle of the fan-shaped plate (1), and the yoke ventilation channel steel (3) extends from the bottom of the coil groove of the fan-shaped plate (1) to the outer circle of the fan-shaped plate (1).

3. The ribbed fan-shaped ventilation slot plate according to claim 1, characterized in that: The inner tooth rib (4) and the edge tooth rib (5) both extend from the inner circle of the fan-shaped piece (1) to the outer circle of the fan-shaped piece (1), and the yoke rib (6) extends from the bottom of the coil groove of the fan-shaped piece (1) to the outer circle of the fan-shaped piece (1).

4. The ribbed fan-shaped ventilation slot plate according to claim 1, characterized in that: A gap of 0.1mm to 10mm is left between the two sides of the toothed ventilation channel steel (2) and the edge of the fan-shaped plate (1).

5. A ribbed fan-shaped ventilation slot plate according to claim 1, characterized in that: The height of the inner tooth rib (4), the edge tooth rib (5), and the yoke rib (6) is 0.1 mm to 0.5 mm less than the height of the tooth ventilation channel steel (2) and the yoke ventilation channel steel (3).

6. The ribbed fan-shaped ventilation slot plate according to claim 1, characterized in that: The inner tooth rib (4), the edge tooth rib (5), and the yoke rib (6) are all straight-winged ribs or corrugated ribs.

7. A ribbed fan-shaped ventilation slot plate according to claim 1, characterized in that: The number N of the inner tooth ribs (4), the number M of the tooth edge ribs (5) and the number L of the yoke ribs (6) are all integers from 0 to 50; when N, M or L is 0, it means that no corresponding rib is provided in that part; the ribs located at the joint of two adjacent ventilation slots are cancelled.

8. An electric motor, comprising a stator core, characterized in that: The stator core includes ribbed fan-shaped ventilation slots as described in any one of claims 1 to 7.

9. A method for manufacturing a ribbed fan-shaped ventilation slot as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1: Processing sector-shaped pieces (1); S2: Fix the tooth ventilation channel steel (2) in the toothed part of the fan-shaped plate (1), fix the yoke ventilation channel steel (3) in the yoke of the fan-shaped plate (1), set a corresponding number of tooth inner ribs (4) between two adjacent tooth ventilation channel steels (2), set a corresponding number of tooth edge ribs (5) between the tooth ventilation channel steel (2) and the coil groove of the fan-shaped plate (1), and set a corresponding number of yoke ribs (6) on both sides of the yoke ventilation channel steel (3).

10. An optimization design method for a ribbed fan-shaped ventilation slot as described in any one of claims 1 to 7, used to optimize the parameters of the ribs in the ribbed fan-shaped ventilation slot as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1: Establish a calculation model. The calculation model includes the iron core, insulation, coil, ventilation channel steel and ventilation slot plate. The calculation area consists of one tooth, two half slots, one iron core segment length and two adjacent ventilation channels. S2: Input motor operating parameters and material thermophysical property parameters, including copper loss, iron loss and ventilation trench air volume; S3: Set boundary conditions and use the three-dimensional fluid-structure interaction method to calculate the fluid field in the ventilation duct and the temperature field in the calculation area; S4: Adjust the width, height, length and number of the inner tooth rib (4), the tooth edge rib (5) and the yoke rib (6), and iteratively execute steps S1 to S3 to obtain the temperature rise calculation results under different structural parameters; S5: Compare the temperature rise calculation results under different structural parameters, and select the structural parameters that meet the preset temperature rise threshold as the final design scheme. The structural parameters include the material, geometric dimensions, quantity of the tooth inner rib (4), tooth edge rib (5) and yoke rib (6), as well as the material and thickness of the fan-shaped plate (1).

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