High-power offshore semi-direct-drive permanent magnet wind driven generator cooling system

Abstract

The invention discloses a high-power offshore semi-direct-drive permanent magnet wind driven generator cooling system which comprises an outer stator and an inner rotor, the outer stator comprises a motor base, a stator iron core and a stator winding assembled on the stator iron core are installed in the motor base, and an air-water cooler is installed on the upper portion of the motor base. A flow guide plate is arranged in the air-water cooler, a heat dissipation core body is installed at the position, located at the bottom of the flow guide plate, in the air-water cooler, and the flow guide plate is used for enabling hot air exhausted out of the motor to pass through the heat dissipation core body to form a plurality of parallel air paths in the air-water cooler. And the plurality of air paths connected in parallel respectively perform cold and heat exchange with the interior of the motor so as to reduce the air resistance in the motor and the air-water cooler. The cooling system has the characteristic of low wind resistance, the power of the air cooling driving motor used by the cooling system can be reduced, the cost of the cooling system is reduced, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind turbines, and in particular relates to a cooling system for a high-power offshore semi-direct-drive permanent magnet wind turbine. Background Art

[0002] With the booming development of the wind power industry and the continuous advancement of technology, offshore wind power is becoming a new trend. However, the offshore environment is characterized by high salt spray and high humidity, which puts higher requirements on motor design. In order to adapt to the offshore environment, a fully enclosed structure is usually adopted, but this also makes the cooling capacity of the motor face greater challenges.

[0003] At present, the existing semi-direct drive permanent magnet wind turbine cooling system has the following disadvantages:

[0004] 1. Single air path iron core radial ventilation is adopted, which affects the wind resistance of the air path;

[0005] 2. Installing a fan on the motor shaft is a complex process with high cost and uneven temperature rise distribution at the stator winding end;

[0006] 3. The stator core has low heat dissipation efficiency and uneven temperature rise distribution.

[0007] In view of this, the inventor provides a high-power offshore semi-direct-drive permanent magnet wind turbine cooling system to solve the above technical problems. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and propose a cooling system for a large-power offshore semi-direct-drive permanent magnet wind turbine generator. The cooling system forms a plurality of parallel wind paths in the air-water cooler by arranging a guide plate inside the air-water cooler, and then the wind paths inside the motor also form a plurality of parallel wind paths, so as to reduce the wind resistance in the motor and the air-water cooler. In addition, a heat dissipation channel, an interlayer cooling channel and a slot cooling channel are arranged on the stator core to improve the heat dissipation efficiency of the motor. The cooling system of the present invention is a new closed and efficient cooling system with the advantages of low wind resistance, high efficiency and low temperature difference.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] The present invention provides a high-power offshore semi-direct-drive permanent magnet wind turbine cooling system, comprising an outer stator and an inner rotor, wherein the outer stator comprises a motor base, wherein a stator core and a stator winding assembled on the stator core are installed in the motor base, an air-water cooler is installed on the upper part of the motor base, a guide plate is arranged inside the air-water cooler, a heat dissipation core is installed inside the air-water cooler and at the bottom of the guide plate, the guide plate is used to form a plurality of parallel air paths in the air-water cooler after hot air discharged from the motor passes through the heat dissipation core, the plurality of parallel air paths respectively perform heat and cold exchange with the inside of the motor, and form a plurality of parallel air paths together with the parallel air paths inside the generator, so as to reduce the wind resistance in the motor and the air-water cooler.

[0011] Furthermore, the heat dissipation core is located above the motor base, and the layout structure is adapted to the form of hot air discharged from the motor, so that the hot air passes through the heat dissipation core vertically and evenly. Since there is only wind resistance along the way, the wind resistance of the hot air passing through the heat dissipation core is reduced.

[0012] Furthermore, a plurality of fans are arranged on the inner side of the air-water cooler, and each fan is connected to a corresponding air-cooling drive motor, and each of the air-cooling drive motors is arranged on the outer side of the air-water cooler. When the hot air is converted into cold air through the heat dissipation core, the guide plate divides the cold air into a plurality of parallel air paths so that the cold air enters the fans on the corresponding sides respectively.

[0013] Among them, at least two of the multiple fans are symmetrically distributed with the guide plate as the axis.

[0014] Furthermore, an annular heat dissipation channel of a set height is provided on the outer surface of the stator core, and the heat dissipation channel is located between the stator core and the motor base;

[0015] Wherein, the set height is 120mm~150mm.

[0016] Furthermore, the stator core is also provided with an interlayer cooling channel and a slot cooling channel.

[0017] Furthermore, the stator core includes a plurality of stator teeth, an interlayer gasket is provided between each of the stator teeth, an I-shaped ventilation structure is provided on each of the interlayer gaskets, all of the I-shaped ventilation structures constitute an interlayer cooling channel, a slot wedge is provided behind the interlayer gasket between each of the stator teeth, there is a height difference between each of the slot wedges and the tooth top of the stator tooth, and the height difference is used to form a slot cooling channel between the slot wedge and the stator tooth.

[0018] Furthermore, the air path is two parallel air paths, and the air paths are as follows: after the hot air exhausted from the inside of the motor enters the heat dissipation core vertically and evenly, it is converted into cold air through a heat exchange, and then the guide plate guides the cold air into the fan on the corresponding side, forming two parallel air paths. Under the action of the fan, the cold air is sent into the motor from both ends of the stator core in parallel at the same time, completing a cycle.

[0019] Furthermore, it also includes a rotor bracket, one end of which is equipped with an air stirring plate.

[0020] Furthermore, the stator winding is a flat wire winding.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The present invention provides a high-power offshore semi-direct-drive permanent magnet wind turbine cooling system. The cooling system forms multiple parallel wind paths in the air-water cooler by setting a guide plate inside the air-water cooler. The multiple parallel wind paths exchange heat and cold with the inside of the motor respectively, thereby forming multiple parallel wind paths in the motor internal wind path, and finally reducing the wind resistance in the motor and the air-water cooler. The cooling system has the characteristics of low wind resistance, which can reduce the power of the air-cooled drive motor used in the cooling system and reduce the cost of the cooling system itself. At the same time, a good cooling system can further improve the motor design power density, reduce the weight and volume of the motor body, and thus reduce the cost of the motor.

[0023] 2) The present invention provides a high-power offshore semi-direct-drive permanent magnet wind turbine cooling system, in which a heat dissipation channel, an interlayer cooling channel and a slot cooling channel are arranged on the stator core, wherein the interlayer cooling channel is in direct contact with the stator winding, that is, in contact with the part with the highest temperature of the motor, thereby converting the existing conduction heat exchange into convection heat exchange, greatly improving the heat exchange efficiency, reducing the maximum temperature of the motor, and further reducing the temperature difference of the motor, making the temperature distribution of the motor more uniform; in addition, the heat dissipation channel covers the entire outer cylindrical surface of the stator core, maximizing the heat dissipation area of ​​the stator core and enhancing the heat dissipation capacity; in addition, the position of the existing slot wedge is changed and moved upward to form a slot cooling channel, further improving the heat dissipation efficiency.

[0024] 3) The present invention provides a high-power offshore semi-direct-drive permanent magnet wind turbine cooling system, in which the heat dissipation core is arranged to be compatible with the form of hot air discharged from the inside of the motor. Firstly, the wind resistance of the hot air passing through the heat dissipation core can be reduced, and secondly, the hot air can pass through the heat dissipation core evenly and fully contact the heat dissipation core, thereby having a higher heat exchange efficiency.

[0025] 4) The present invention provides a high-power offshore semi-direct-drive permanent magnet wind turbine cooling system, which replaces the fan installed on the existing motor shaft with a stirrer installed at one end of the rotor bracket. Compared with the existing technology, this design is beneficial in that it can solve the problem of uneven temperature rise distribution at the end of the stator winding, and the implementation process is simple and low-cost.

[0026] 5) The present invention provides a high-power offshore semi-direct-drive permanent magnet wind turbine cooling system, which forms a cooling air path with low wind resistance and high heat dissipation efficiency by combining the design of the guide plate, the layout of the heat dissipation core and the design of multiple cooling channels inside the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 It is a structural schematic diagram of a cooling system for a high-power offshore semi-direct-drive permanent magnet wind turbine generator according to the present invention;

[0030] Figure 2 It is an axial cross-sectional view of the cooling system of the high-power offshore semi-direct-drive permanent magnet wind turbine generator of the present invention;

[0031] Figure 3 It is an axial longitudinal view of the cooling system of the high-power offshore semi-direct-drive permanent magnet wind turbine generator of the present invention;

[0032] Figure 4 for Figure 3 A partial enlarged view of area A;

[0033] Figure 5 The present invention is a schematic diagram of the structure of the agitator plate of the cooling system of the high-power offshore semi-direct-drive permanent magnet wind turbine.

[0034] in:

[0035] 1 is a motor base;

[0036] 2 is the stator core; 21 is the heat dissipation channel; 22 is the isolation bar; 23 is the I-type ventilation structure; 24 is the slot wedge

[0037] 3 is the stator winding;

[0038] 4 is an air-water cooler; 41 is a guide plate; 42 is a heat dissipation core; 43 is a fan; 44 is an air-cooled drive motor;

[0039] 5 is a wind stirring plate;

[0040] 6 is a left sealing plate 1;

[0041] 7 is the left sealing plate 2;

[0042] 8 is a right sealing plate 1;

[0043] 9 is the second right sealing plate;

[0044] 10 is a front end cover;

[0045] 101 is a rear end cover;

[0046] 102 is an air gap;

[0047] 103 is a conductive ring. DETAILED DESCRIPTION

[0048] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.

[0049] See also Figure 1 , Figure 2 The present invention provides a high-power offshore semi-direct-drive permanent magnet wind turbine cooling system, comprising an outer stator and an inner rotor, wherein the outer stator comprises a motor base 1, wherein a stator core 2 and a stator winding 3 mounted on the stator core 2 are installed in the motor base 1, an air-water cooler 4 is installed on the upper part of the motor base 1, a guide plate 41 is arranged inside the air-water cooler 4, and the guide plate 41 is in a Y-shaped structure, a heat dissipation core 42 is installed inside the air-water cooler 4 and at the bottom of the guide plate 41, the guide plate 41 is used to form a plurality of parallel air paths in the air-water cooler 4 after the hot air discharged from the motor passes through the heat dissipation core 42, the plurality of parallel air paths respectively perform cold and heat exchange with the inside of the motor, and form a plurality of parallel air paths together with the parallel air paths inside the generator, thereby finally reducing the wind resistance in the motor and the air-water cooler.

[0050] Furthermore, the heat dissipation core 42 is located above the motor base 1, and the layout structure is adapted to the form of hot air discharged from the inside of the motor, so that the hot air passes through the heat dissipation core 42 vertically and evenly, thereby reducing the wind resistance of the hot air passing through the heat dissipation core 42. This layout structure greatly reduces the wind resistance due to the lack of local resistance, thereby improving the heat exchange efficiency.

[0051] It should be noted that the layout structure of the heat dissipation core 42 is conducive to reducing the wind resistance of hot air passing through the heat dissipation core 42; secondly, it can make the hot air pass through the heat dissipation core 42 evenly and fully contact with it, thereby achieving a higher heat exchange efficiency.

[0052] In this embodiment, four fans 43 are arranged inside the air-water cooler 4, and each fan 43 is connected to a corresponding air-cooling drive motor 44, and each of the air-cooling drive motors 44 is arranged outside the air-water cooler 4. When the hot air is converted into cold air by the heat dissipation core 42, the guide plate 41 divides the cold air into a plurality of parallel air paths so that the cold air enters the fans 43 on the corresponding sides respectively.

[0053] Two of the four fans 43 form a group, and the two groups of fans 43 are symmetrically distributed with the guide plate 41 as the axis.

[0054] In this embodiment, a guide plate 6 is provided to divide the cooling into two parallel wind paths. First, the wind resistance in the air-water cooler 4 can be reduced. Second, the hot air discharged from the motor can be more uniform and given greater power to pass through the heat dissipation core 42 and efficiently complete the heat exchange. Third, the hot air passing through the heat dissipation core 42 can be guided to smoothly enter the fan 43 without generating consumable eddy currents.

[0055] like Figure 2 As shown, one end of the stator core 2 is installed with a left sealing plate 6 and a left sealing plate 2 7 connected to the top of the left sealing plate 6, and the other end is installed with a right sealing plate 8 and a right sealing plate 2 9 connected to the top of the right sealing plate 8. One end of the motor base 1 is installed with a front end cover 10, and the other end is installed with a rear end cover 101. There is an air gap 102 between the stator winding 3 and the stator core 2. The outer stator also includes a conductive ring 103, which is located at one end of the stator winding 3.

[0056] like Figure 3 As shown, a ring-shaped heat dissipation channel 21 of a set height is provided on the outer surface of the stator core 2. The heat dissipation channel 21 is located between the stator core 2 and the motor frame 1. The set height is most suitable between 120 mm and 150 mm after multiple calculations, achieving the best matching state between wind resistance and heat dissipation. The heat dissipation channel 21 covers the entire outer surface of the stator core 2, maximizes the heat dissipation area of ​​the stator core 2, enhances the heat dissipation capacity, and improves the heat dissipation efficiency.

[0057] like Figure 4 As shown, the stator core 2 is also provided with an interlayer cooling channel and a slot cooling channel. Specifically, the interlayer cooling channel passes through the part with the highest temperature of the motor, which greatly improves the heat exchange efficiency, reduces the maximum temperature of the motor, and further reduces the temperature difference of the motor, making the temperature distribution of the motor more uniform.

[0058] In this embodiment, the stator core 2 includes a plurality of stator teeth, interlayer gaskets are arranged between each stator tooth, each interlayer gasket is provided with an I-shaped ventilation structure 23, and all I-shaped ventilation structures 23 constitute an interlayer cooling channel, and a slot wedge 24 is arranged between each stator tooth and located behind the interlayer gasket, and there is a height difference between each slot wedge 24 and the tooth top of the stator tooth, and the height difference is used to form a slot cooling channel between the slot wedge 24 and the stator tooth.

[0059] like Figure 2 As shown in the figure, the air path is two parallel air paths, and the air paths are as follows: the hot air discharged from the motor (via Figure 2 After the air is discharged from the isolation strips 22 shown in the figure) enters the heat dissipation core 42 vertically and evenly, it undergoes a heat exchange to convert the hot air into cold air, and then the guide plate 41 guides the cold air into the fan 43 on the corresponding side to form two parallel air paths. Under the action of the fan 43, the cold air is sent into the motor from both ends of the stator core 2 in parallel (that is, the air path inside the motor is also two parallel air paths), completing a cycle.

[0060] like Figure 2 , Figure 5 As shown, the generator further includes a rotor bracket, one end of which is mounted with a stirring plate 5, and the stirring plate 5 is arranged close to the side of the conductive ring 103. Specifically, the fan mounted on the existing motor shaft is replaced with a stirring plate 5 mounted on one end of the rotor bracket. Compared with the prior art, this design is advantageous in that the stirring plate 5 is driven to rotate by the rotation of the generator itself, so that the circumferential temperature distribution of the end of the stator winding 3 above it is uniform, and the process is simple and the cost is low.

[0061] In this embodiment, the stator winding 3 is a flat wire winding, that is, a hard winding.

[0062] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the records in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery and parts all adopt conventional models in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0063] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0064] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A high-power offshore semi-direct-drive permanent magnet wind turbine cooling system, the generator comprising an outer stator and an inner rotor arranged in the outer stator, the outer stator comprising a motor base (1), a stator core (2) and a stator winding (3) mounted on the stator core (2) are installed in the motor base (1), an air-water cooler (4) is installed on the upper part of the motor base (1), characterized in that: A guide plate (41) is provided inside the air-water cooler (4), and a heat dissipation core (42) is installed inside the air-water cooler (4) and at the bottom of the guide plate (41). The guide plate (41) is used to form a plurality of parallel air paths in the air-water cooler (4) after hot air exhausted from the motor passes through the heat dissipation core (42). The plurality of parallel air paths respectively perform heat and cold exchange with the inside of the motor to reduce wind resistance in the motor and the air-water cooler.

2. The high-power offshore semi-direct-drive permanent magnet wind turbine cooling system according to claim 1 is characterized in that: The heat dissipation core (42) is located above the motor base (1), and its layout structure is adapted to the form of hot air discharged from the motor, so that the hot air passes through the heat dissipation core (42) vertically and evenly, thereby reducing the wind resistance of the hot air passing through the heat dissipation core (42).

3. The high-power offshore semi-direct drive permanent magnet wind turbine cooling system according to claim 1 is characterized in that: A plurality of fans (43) are arranged on the inner side of the air-water cooler (4), and each fan (43) is connected to a corresponding air-cooling drive motor (44). Each of the air-cooling drive motors (44) is arranged on the outer side of the air-water cooler (4). When the hot air is converted into cold air through the heat dissipation core (42), the guide plate (41) divides the cold air into a plurality of parallel air paths so that the cold air enters the fans (43) on the corresponding sides respectively. Among the multiple fans (43), at least two are symmetrically distributed with the guide plate (41) as the axis.

4. The high-power offshore semi-direct drive permanent magnet wind turbine cooling system according to claim 1 is characterized in that: An annular heat dissipation channel (21) of a set height is provided on the outer surface of the stator core (2), and the heat dissipation channel (21) is located between the stator core (2) and the motor base (1); Wherein, the set height is 120mm~150mm.

5. The high-power offshore semi-direct-drive permanent magnet wind turbine cooling system according to claim 1 is characterized in that: The stator core (2) is also provided with an interlayer cooling channel and a slot cooling channel.

6. The high-power offshore semi-direct-drive permanent magnet wind turbine cooling system according to claim 5 is characterized in that: The stator core (2) comprises a plurality of stator teeth, an interlayer gasket is provided between each of the stator teeth, an I-shaped ventilation structure (23) is provided on each of the interlayer gaskets, and all the I-shaped ventilation structures (23) form an interlayer cooling channel, and a slot wedge (24) is provided between each of the stator teeth and is located behind the interlayer gasket, and there is a height difference between each of the slot wedges (24) and the tooth top of the stator tooth, and the height difference is used to form a slot cooling channel between the slot wedge (24) and the stator tooth.

7. The high-power offshore semi-direct-drive permanent magnet wind turbine cooling system according to claim 1 is characterized in that: The wind paths are two parallel wind paths, and the wind paths are as follows: the hot air discharged from the motor enters the heat dissipation core (42) vertically and evenly, and is converted into cold air through a heat exchange, and then the guide plate (41) guides the cold air into the fan (43) on the corresponding side, forming two parallel wind paths. Under the action of the fan (43), the cold air is simultaneously and parallelly sent into the motor from both ends of the stator core (2), completing a cycle.

8. The high-power offshore semi-direct-drive permanent magnet wind turbine cooling system according to claim 1 is characterized in that: It also comprises a rotor bracket, one end of which is provided with an air stirring plate (5).

9. The high-power offshore semi-direct drive permanent magnet wind turbine cooling system according to any one of claims 1 to 8, characterized in that: The stator winding (3) is a flat wire winding.

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