Motor and wind generating set

Abstract

The embodiment of the invention provides a motor and a wind generating set comprising the same. The motor comprises a stator and a rotor which are coaxially arranged, an air gap is formed between the stator and the rotor, the air gap forms an axial ventilation duct, the stator is defined into at least one first axial section and at least one second axial section in the axial direction, and a cooling medium sleeve is arranged on the periphery of each first axial section. The cooling medium sleeves are used for conducting contact type heat exchange with the first axial sections, each second axial section is provided with a plurality of radial ventilation channels which are communicated in the radial direction, the cooling medium sleeves and the radial ventilation channels are alternately arranged, one ends of the radial ventilation channels are communicated with the axial ventilation channels, and the other ends of the radial ventilation channels are communicated with the outside. According to the motor provided by the embodiment of the invention, the motor is cooled by combining the radial ventilating duct, the axial ventilating duct and the cooling medium sleeve, so that the motor is good in heat dissipation effect, low in power density and low in loss.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and particularly relates to an electric machine and a wind turbine generator set. Background Art

[0002] Due to the reliable performance and moderate cost of medium-speed permanent magnet wind generators, the medium-speed permanent magnet technology route has gradually become a mainstream technology route for wind generators at present. And a good heat dissipation method is extremely important for the operation of the generator and even the entire unit.

[0003] Currently, air cooling is generally adopted for the heat dissipation of generators. When air cooling is used, the generator mostly adopts the radial ventilation method. As Figure 1 shown, an axial ventilation duct 210a is formed by the air gap between the stator 10a and the rotor 20a. The stator 10a is provided with radially penetrating radial ventilation ducts 113a. Air inlets 320a are arranged at both ends of the stator 10a corresponding to the stator 10a on the housing 30a, and an air outlet 310a is arranged in the middle. After the outside cold air enters the electric machine through the air inlets 320a, it flows through the axial ventilation duct 210a and the radial ventilation ducts 113a in sequence and flows out from the air outlet 310a. The temperature at the air inlets 320a is low, and the temperature at the air outlet 310a is high. Its advantage is that the temperature distribution of the stator winding 120a and the stator core 110a is relatively uniform, and the temperature difference is small. However, the disadvantage is that the existence of the radial ventilation ducts 113a will make the axial length of the generator longer, the power density decrease, and the loss increase. With the development trend of larger and larger generator power, the number of radial ventilation ducts reaches more than 10 or even more than 20, and the loss increases. Therefore, there is an urgent need to propose an electric machine with good heat dissipation effect, high power density, and low loss. Summary of the Invention

[0004] Therefore, the purpose of the present invention is to provide an electric machine and a wind turbine generator set to at least solve one of the problems existing in the above-mentioned prior art or related technologies.

[0005] The first aspect embodiment of the present invention provides an electric machine, which includes a stator and a rotor arranged coaxially. There is an air gap between the stator and the rotor, and the air gap forms an axial ventilation duct. The stator is defined as at least one first axial segment and at least one second axial segment in the axial direction. A cooling medium sleeve is arranged on the outer periphery of each first axial segment, and the cooling medium sleeve is used for contact heat exchange with the first axial segment. Each second axial segment is provided with a plurality of radially penetrating radial ventilation ducts. The cooling medium sleeves and the plurality of radial ventilation ducts are arranged alternately. One end of the radial ventilation duct is communicated with the axial ventilation duct, and the other end of the radial ventilation duct is communicated with the outside.

[0006] The second aspect embodiment of the present invention provides a wind turbine generator set, including: the electric machine as described in the first aspect embodiment above.

[0007] The motor provided by the embodiment of the present invention adopts a combination of a radial ventilation duct, an axial ventilation duct and a cooling medium jacket to cool the motor, and the motor has good heat dissipation effect, low power density and low loss.

[0008] Since the wind power generation set provided by the embodiment of the present invention has the motor provided by the first aspect embodiment as described above, it further has the beneficial effects of the above embodiment, which will not be elaborated here.

[0009] Some other aspects and / or advantages of the general concept of the present invention will be described in part in the following description, and some will be clear from the description, or can be learned through the implementation of the general concept of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Through the following description with reference to the drawings which exemplarily show an example, the above and other objects and features of the present invention will become clearer, wherein:

[0011] Figure 1 A partial structural schematic diagram of a motor in an embodiment of the related art is shown;

[0012] Figure 2 A partial structural schematic diagram of another motor in an embodiment of the related art is shown;

[0013] Figure 3 A partial structural schematic diagram of a motor in an embodiment of the present application is shown;

[0014] Figure 4 A partial structural schematic diagram of a motor in another embodiment of the present application is shown;

[0015] Figure 5 Another partial structural schematic diagram of a motor in another embodiment of the present application is shown.

[0016] Figure 1 and Figure 2 DESCRIPTION OF REFERENCE NUMERALS:

[0017] 10a stator, 110a stator core, 113a radial ventilation duct, 120a stator winding, 20a rotor, 210a axial ventilation duct, 30a housing, 310a air outlet, 320a air inlet, 40a cooling water jacket

[0018] Figures 3 to 5 DESCRIPTION OF REFERENCE NUMERALS:

[0019] 10 stator, 110 stator core, 111 first axial section, 112 second axial section, 113 radial ventilation duct, 120 stator winding

[0020] 20 rotor, 210 axial ventilation duct

[0021] 30 housing, 310 air outlet, 320 air inlet,

[0022] 40 cooling medium sleeve, 410 circuit. Detailed implementation manners

[0023] The following detailed implementation manners are provided to help the reader obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of this application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example and is not limited to those set forth herein, but may be changed as will be apparent after understanding the disclosure of this application, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for greater clarity and conciseness.

[0024] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. On the contrary, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, devices, and / or systems described herein, which will be apparent after understanding the disclosure of this application.

[0025] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more of them.

[0026] Although terms such as "first", "second", and "third" may be used herein to describe various components, components, regions, layers, or parts, these components, components, regions, layers, or parts should not be limited by these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer, or part from another. Thus, a first component, first component, first region, first layer, or first part referred to in the examples described herein may also be referred to as a second component, second component, second region, second layer, or second part without departing from the teachings of the examples.

[0027] In the specification, when an element such as a layer, region, or substrate is described as "on" another element, "connected to" or "coupled to" another element, the element may be directly "on" another element, directly "connected to" or "coupled to" another element, or there may be one or more other elements in between. On the contrary, when an element is described as "directly on" another element, "directly connected to" or "directly coupled to" another element, there may be no other elements in between.

[0028] The terms used herein are for describing various examples only and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including" and "having" specify the presence of the described features, quantities, operations, components, elements and / or their combinations, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements and / or their combinations. The term "plurality" represents any quantity of two or more.

[0029] The definitions of orientation terms such as "upper", "left side", "right side", "inner side" and "outer side" in this application are based on the orientation in the drawings and do not necessarily represent the orientation under normal use of the product.

[0030] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs after understanding this invention. Unless explicitly defined as such herein, terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this invention, and should not be interpreted in an idealized or overly formalized manner.

[0031] Most of the motor heat dissipation in the related art adopts the air-cooling form. Specifically, as Figure 1 shown, an axial ventilation duct 210a is formed in the air gap between the stator 10a and the rotor 20a. The stator 10a has a radially penetrating radial ventilation duct 113a. Air inlets 320a are provided at both ends of the stator 10a on the housing 30a, and an air outlet 310a is provided in the middle. After the outside cold air enters the motor through the air inlets 320a, it flows through the axial ventilation duct 210a and the radial ventilation duct 113a in sequence and flows out from the air outlet 310a. The temperature at the air inlets 320a is low, and the temperature at the air outlet 310a is high. Its advantage is that the temperature distribution of the stator winding 120a and the stator core 110a is relatively uniform and the temperature difference is small, but the disadvantage is that the presence of the radial ventilation duct 113a will make the axial length of the generator longer, the power density lower, and the loss increase. With the development trend of the increasing power of the generator, the number of the radial ventilation ducts 113a reaches more than 10 or even more than 20, and the loss increases.

[0032] Therefore, a cooling method of air-cooling plus water-cooling has been proposed in the related art. As Figure 2As shown, an air gap is formed between the stator 10a and the rotor 20a to form an axial ventilation duct 210a. Air inlets 320a and air outlets 310a are respectively provided at both ends of the stator 10a on the housing 30a. After the outside cold air enters the axial ventilation duct 210a through the air inlets 320a, it flows out through the air outlets 310a. A cooling water jacket 40a is provided on the outer side of the stator 10a, and heat exchange is carried out between the coolant in the cooling water jacket 40a and the stator 10a. Although the axial length of the motor is not increased here and the power density is relatively high, since the cold air enters from one end of the motor and exits from the other end, the parts of the stator winding 120a, the stator core 110a and the rotor 20a close to the air inlet 320a have relatively low temperatures, while the parts close to the air outlet 310a have very high temperatures, resulting in a large axial temperature difference in the stator winding 120a, the stator core 110a and the rotor 20a, which is not conducive to the service life of the motor. In addition, too high a temperature of the stator winding 120a will lead to an increase in cost, and materials with a higher insulation class need to be used, which will affect the operation of the motor in the short term and shorten the service life of the motor in the long term.

[0033] Based on this, to solve the above problems, an embodiment of the present invention provides a motor, which adopts a cooling method combining radial ventilation, axial ventilation and a cooling medium jacket 40. The motor has good heat dissipation effect and high power density. The following will be combined with Figures 3 to 5 to introduce the motor and the wind power generating set provided by the embodiment of the present invention. Among them, Figure 3 and Figure 4 are each half of a radial cross-sectional view of the motor, specifically a schematic diagram of the upper half part located on the axis of the motor in the radial cross-sectional view. The overall motor structure rotates one week inward or outward with the figure as the standard, Figure 5 is a schematic diagram of a partial structure of the outer peripheral surface of the motor.

[0034] As Figure 3 、 Figure 4 and Figure 5 shown, an embodiment of the first aspect of the present invention provides a motor, which includes a stator 10 and a rotor 20 arranged coaxially. An air gap is provided between the stator 10 and the rotor 20, and the air gap forms an axial ventilation duct 210. The stator 10 is defined in the axial direction as at least one first axial segment 111 and at least one second axial segment 112. A cooling medium jacket 40 is provided on the outer periphery of each first axial segment 111, and the cooling medium jacket 40 is used for contact heat exchange with the first axial segment 111. A plurality of radially penetrating radial ventilation ducts 113 are provided on each second axial segment 112. The cooling medium jacket 40 and the plurality of radial ventilation ducts 113 are arranged alternately. One end of the radial ventilation duct 113 is communicated with the axial ventilation duct 210, and the other end of the radial ventilation duct 113 is communicated with the outside.

[0035] The motor provided by the embodiment of this aspect adopts a combination of a radial ventilation duct 113, an axial ventilation duct 210, and a cooling medium sleeve 40 to cool the stator 10 of the motor. The motor has good heat dissipation effect, low power density, and low loss. Specifically, when dissipating heat from the motor, the outside cold air flows through the axial ventilation duct 210 and the radial ventilation duct 113 on the second axial section 112 to cool down the rotor 20, the stator core 110, and the stator winding 120. At the same time, the cooling medium sleeve 40 also exchanges heat with the first axial section 111 to reduce the temperature of the stator core 110. Compared with the related art where when air cooling is used, a plurality of radial ventilation ducts 113 are evenly distributed in the axial direction of the stator 10 and the axial length of the stator 10 is very long, the radial ventilation duct 113 is only arranged on the second axial section 112 and does not completely occupy the entire stator 10, reducing the axial length of the stator 10, thereby reducing the power density and reducing the loss. Moreover, by using the cooling medium sleeve 40 to exchange heat with the first axial section 111, the part not occupied by the radial ventilation duct 113 can be cooled. Coupled with a plurality of radial ventilation ducts 113, the heat dissipation effect of the motor is good.

[0036] In addition, compared with the related art where a cooling water sleeve is integrally sleeved outside the stator 10 and the cold air can only flow from the first end of the axial ventilation duct 210 to the second end and gradually heats up, resulting in a very high temperature of the second end and the nearby windings of the stator core 110, the cold air can also enter the radial ventilation duct 113 to cool the stator core 110. Assuming that the outside cold air first enters the radial ventilation duct 113 and then enters the axial ventilation duct 210, a large amount of cold air flows along the axial ventilation duct 210. Even when the cold air reaches the second end of the stator core 110, the temperature will not be too high, which can reduce the probability of the temperature of the second end of the stator core 110 and its nearby windings being too high, reduce the temperature difference between the two axial ends of the stator 10, and ensure the service life of the motor. Assuming that a part of the cold air flows into the radial ventilation duct 113 from the axial ventilation duct 210 and then flows out, and the other part flows along the axial ventilation duct 210 to the second end of the stator 10, this increases the flow path of the cold air, and the cold air can fully exchange heat with the stator core 110 before being heated up too high by heat exchange, which can better reduce the temperature of the stator 10. This is also beneficial to reducing the temperature of the second end of the stator core 110 and its nearby windings and improving the service life of the motor.

[0037] It should be noted that the axial ventilation duct 210 and the radial ventilation duct 113 are interconnected, and the outside cold air can first enter the radial ventilation duct 113 through the axial ventilation duct 210 and then flow out, or can first enter the axial ventilation duct 210 through the radial ventilation duct 113, or can enter the axial ventilation duct 210 and the radial ventilation duct 113 simultaneously.

[0038] Furthermore, in some embodiments, such as Figure 3 、 Figure 4 and Figure 5As shown, the motor further includes a housing 30, and the stator 10 and the rotor 20 are disposed in the housing 30.

[0039] A first ventilation opening is provided at a position on the housing 30 corresponding to the second axial section 112, and the first ventilation opening communicates with a plurality of radial ventilation ducts 113. At this time, the cold air from the outside can enter the radial ventilation ducts 113 through the first ventilation opening, or the cold air in the axial ventilation duct 210 can flow out to the outside through the radial ventilation ducts 113 and the first ventilation opening. Providing the first ventilation opening at a position on the housing 30 corresponding to the second axial section 112 can ensure the rapid circulation of the cold air between the outside and the plurality of radial ventilation ducts 113, improving the heat dissipation efficiency.

[0040] A second ventilation opening communicating with the axial ventilation duct 210 is further provided on the housing 30. The axial ventilation duct 210 can be directly communicated with the outside through the second ventilation opening, which is beneficial to the rapid circulation of the cold air between the outside and the axial ventilation duct 210, improving the heat dissipation efficiency.

[0041] Furthermore, the number of the first ventilation openings is the same as the number of the second axial sections 112, and each first ventilation opening includes at least one first sub-ventilation opening circumferentially distributed around the second axial section 112. Each radial ventilation duct 113 is circumferentially distributed around the stator 10, and the plurality of radial ventilation ducts 113 communicate with the outside through at least one first sub-ventilation opening. Then, in the case where each first ventilation opening includes a plurality of first sub-ventilation openings, the plurality of radial ventilation ducts 113 can communicate with the outside at a plurality of circumferential angles through the plurality of first sub-ventilation openings, improving the heat dissipation efficiency of the motor.

[0042] For example, if the stator 10 has only one second axial section 112, the number of the first ventilation openings is one, but the first ventilation opening can include two first sub-ventilation openings. The two first sub-ventilation openings are circumferentially spaced apart around the second axial section 112 on the housing 30, so that the plurality of radial channels on the second axial section 112 can communicate with the outside at two circumferential angles through the two first sub-ventilation openings, improving the heat dissipation efficiency.

[0043] For another example, if the stator 10 includes two second axial sections 112, the number of the first ventilation openings is two, and each first ventilation opening includes three first sub-ventilation openings. The three first sub-ventilation openings are circumferentially spaced apart around the corresponding second axial section 112 on the housing 30, so that the plurality of radial channels on each second axial section 112 can communicate with the outside at three circumferential angles, improving the heat dissipation efficiency.

[0044] Among them, each radial ventilation duct 113 can be circumferentially distributed around the stator 10, that is, after the cold air enters the radial ventilation duct 113, it can exchange heat with the stator core 110 in the circumferential direction of the stator core 110, and the heat dissipation effect of the motor is good. Specifically, the stator core 110 can be formed by stacking multiple sheet-like structures, and each radial ventilation duct 113 is formed by the gap between two adjacent sheet-like structures. At this time, a separator can be arranged between the two adjacent sheet-like structures to define the size of the radial ventilation duct 113. Coupled with multiple first sub-ventilation openings distributed at circumferential intervals, multiple radial ventilation ducts 113 can communicate with the outside at multiple angles in the circumferential direction.

[0045] Specifically, in the case where each first ventilation opening includes multiple first sub-ventilation openings distributed circumferentially and each second ventilation opening includes multiple second sub-ventilation openings distributed circumferentially, since Figure 3 and Figure 4 is half of a radial cross-sectional view of the motor, Figure 5 is a schematic diagram of the local structure of the motor. Therefore, Figure 3 、 Figure 4 and Figure 5 The position indicated by the reference numeral 310 in Figure 5 is actually a second sub-ventilation opening of a second ventilation opening, and this second ventilation opening is the air outlet 310. The position on the left side indicated by the reference numeral 320 is actually a second sub-ventilation opening of another second ventilation opening, and this second ventilation opening is the air inlet 320. The position on the right side indicated by the reference numeral 320 is actually a first sub-ventilation opening of a first ventilation opening, and this first ventilation opening is the air inlet 320. Taking Figure 5 The two second sub-ventilation openings and one first sub-ventilation opening shown side by side in

[0046] as a group, but if the structure of the housing 30 in Figure 5 is completed, then there can be multiple groups of the above ventilation structures in the circumferential direction of the housing 30, so as to realize the multi-angle communication between the axial ventilation duct 210 and the radial ventilation duct 113 and the outside in the circumferential direction.

[0047] Further, the number of the second ventilation openings is two, which are respectively located at both axial ends of the stator 10, and each second ventilation opening includes at least one second sub-ventilation opening circumferentially distributed around the stator 10. Any end of the axial ventilation duct 210 communicates with the outside through at least one second sub-ventilation opening. Since the axial ventilation duct 210 between the stator 10 and the rotor 20 is circumferentially distributed around the rotor 20, when each second ventilation opening includes a plurality of second sub-ventilation openings, the axial ventilation duct 210 can communicate with the outside at multiple circumferential angles through the plurality of second sub-ventilation openings, improving the heat dissipation efficiency.

[0048] Optionally, among all the first ventilation openings and the two second ventilation openings, at least two ventilation openings are air inlets 320, and the remaining ventilation openings are air outlets 310. The outside cold air enters the motor interior through at least two ventilation openings to ensure sufficient cold quantity and the heat dissipation effect of the motor.

[0049] Optionally, a filter element is provided at the first ventilation opening and / or the second ventilation opening, especially when it is used as the air inlet 320, to prevent impurities from the outside from entering the motor interior.

[0050] Optionally, the second ventilation opening is provided on the outer peripheral surface of the housing 30 instead of on the two axial end surfaces. That is, all the second sub-ventilation openings are provided on the outer peripheral surface of the housing 30. Thus, after the outside cold air enters the second ventilation opening, it needs to bend and enter the axial ventilation duct 210. At the bending position, the cold air can fully exchange heat with the stator winding 120 at the end of the stator core 110, reducing the temperature of the end of the stator winding 120. Similarly, the cold air flowing out of the axial ventilation duct 210 also needs to bend and flow out from the second ventilation opening, and will also fully exchange heat with the stator winding 120. Of course, in other embodiments, the second ventilation opening can also be provided on the axial end surface of the housing 30.

[0051] In some embodiments, as Figure 4 shown, the number of the first axial segments 111 is one, and the number of the second axial segments 112 is one. Then, a part of the stator 10 is sleeved with a cooling medium sleeve 40, and the other part has a radial ventilation duct 113, with a simple structure and convenient processing.

[0052] The first ventilation opening is an air inlet 320, the second ventilation opening that is axially far from the first axial segment 111 among the two second ventilation openings is an air outlet 310, and the second ventilation opening close to the first axial segment 111 is an air inlet 320. Referring to Figure 4 , after the outside cold air enters the axial ventilation duct 210 from the left air inlet 320, with heat exchange, the temperature will gradually increase when flowing towards the air outlet 310. If the radial ventilation duct 113 is not provided, the cold air will flow towards Figure 4When the air outlet 310 is on the right side in the middle, the temperature is relatively high, resulting in high temperatures of the stator core 110 and the stator winding 120 on this side. There is a large temperature difference between the two axial ends of the stator 10, which affects the service life of the motor. In this embodiment, the second axial section 112 is arranged close to the air outlet 310, so that the cold air from the outside can enter the motor through multiple radial ventilation ducts 113 and converge with the cold air in the axial ventilation duct 210. This can effectively reduce the temperature of the cold air at this place, enabling the cold air to better reduce the temperatures of the stator core 110 and the stator winding 120 on the side where the air outlet 310 is located, thereby improving the service life of the motor. Moreover, when the cold air flows through the multiple radial ventilation ducts 113, it can also exchange heat with the stator core 110, directly reducing the temperature of the part of the stator core 110 close to the air outlet 310. This further reduces the temperature difference between the two axial ends of the motor and improves the heat dissipation effect of the motor.

[0053] In addition, the cooling medium sleeve 40 is in contact with the stator 10 on the outside of the stator 10 for heat exchange, and the radial ventilation ducts 113 radially penetrate the stator core 110, and the heat dissipation efficiency of radial ventilation is high. Therefore, making the air inlet 320 close to the cooling medium sleeve 40 and the air outlet 310 close to the radial ventilation ducts 113 can better balance the heat dissipation efficiency at all parts of the motor axially and avoid the situation of excessive local temperature.

[0054] In some other embodiments, as Figure 3 shown, there are two first axial sections 111, and the number of the second axial sections 112 is one. The second axial section 112 is located between the two first axial sections 111. Then there are two cooling medium sleeves 40 on the outer periphery of the stator 10, and multiple radial ventilation ducts 113 are arranged between the two cooling medium sleeves 40. The radial ventilation ducts 113 occupy a small axial length of the stator 10, have a high power density, and low losses.

[0055] In addition, the first ventilation opening is the air outlet 310, and the two second ventilation openings are the air inlets 320. Then referring to Figure 3 , the cold air from the outside can enter the motor from both axial ends of the motor, then flow along the axial ventilation duct 210 and then flow out through the radial ventilation ducts 113 and the air outlet 310. Cooperating with the cooling medium sleeves 40 at both axial ends of the stator 10, the overall heat dissipation of the motor is more uniform, which can effectively reduce the temperature difference between the two axial ends of the motor and improve the service life of the motor.

[0056] In specific applications, the second axial section 112 is located in the middle of the stator 10 axially. This is beneficial to the uniform heat dissipation of the motor.

[0057] Further, in some embodiments, the ratio of the total length of all the second axial segments 112 to the axial length L1 of the stator 10 and the axial length L of the stator 10 satisfies: 0 < L1 / L ≤ 0.5. This can ensure that the design of the radial ventilation ducts 113 does not increase the axial length of the stator 10 too much, thereby facilitating a higher power density of the motor and reducing losses.

[0058] In a specific application, the total length of all the second axial segments 112 accounts for one-third or one-half of the axial length of the stator 10.

[0059] Further, in some embodiments, the width range of each radial ventilation duct 113 is from 6 mm to 10 mm. While ensuring the smooth flow of cold air, it will not excessively increase the axial length of the stator 10, thereby ensuring that the power density will not be too low.

[0060] In a specific application, the width of each radial ventilation duct 113 is 7 mm or 8 mm.

[0061] Further, in some embodiments, the stator 10 is sleeved on the radial outer side of the rotor 20, the housing 30 is sleeved on the outer side of the stator 10, and the cooling medium sleeve 40 is fixedly connected to the housing 30. Then, in addition to being sleeved on the stator 10, the cooling medium sleeve 40 is also connected to the housing 30, improving the installation stability of the cooling medium sleeve 40.

[0062] Regarding the specific installation method of the cooling medium sleeve 40, further, circumferentially distributed mounting openings are provided on the part of the housing 30 corresponding to the first axial segment 111, and the cooling medium sleeve 40 is arranged at the mounting openings. In this case, the cooling medium sleeve 40 is directly exposed through the mounting openings, facilitating the supply of circulating cooling medium into the cooling medium sleeve 40 from the outside of the motor through the mounting openings. Compared with the related art where the housing 30 shields the outer periphery of the cooling medium sleeve 40 and additional small openings are provided on the housing 30 to communicate with the liquid inlet and outlet of the cooling medium sleeve 40 to supply cooling medium to the cooling medium sleeve 40, it reduces the material used for the housing 30, saves costs, and reduces the weight of the motor.

[0063] Further, the cooling medium sleeve 40 is made of a magnetic shielding material. For example, the material of the cooling medium sleeve 40 is the same as that of the housing 30. On the one hand, it facilitates the welding connection between the two, and on the other hand, it can keep the appearance color of the motor consistent, with a good appearance effect.

[0064] Further, the housing 30 is divided into multiple parts in the axial direction of the motor, and an installation opening is formed between any two adjacent parts. The cooling medium sleeve 40 in the installation opening connects the two adjacent parts of the housing 30 together. The number of installation openings is the same as the number of cooling medium sleeves 40, so that the structure of the housing 30 can be designed according to the number and position of the cooling medium sleeves 40.

[0065] In a specific embodiment, referring to Figure 4 , when the number of the cooling medium sleeves 40 is one and the number of the mounting openings is one, the housing 30 can be divided into left and right parts in the axial direction of the motor. The left side of the cooling medium sleeve 40 is connected to the left part of the housing 30, and the right side of the cooling medium sleeve 40 is connected to the right part of the housing 30. A mounting opening is formed between the left part and the right part of the housing 30. At this time, a first ventilation opening is provided at a part of the right side of the housing 30 corresponding to the radial ventilation duct 113.

[0066] In the specific installation process, the cooling medium sleeve 40 can be first sleeved on the stator 10, and then the left part of the housing 30 is sleeved on the outer periphery of the stator 10 from the left side of the stator 10. The left side of the cooling medium sleeve 40 is connected to this part of the housing 30. Then, the right part of the housing 30 is sleeved on the outer periphery of the stator 10 from the right side of the stator 10, and the right side of the cooling medium sleeve 40 is further connected to the right part of this housing 30. A mounting opening for the cooling medium sleeve 40 to be exposed is formed between the two parts of the housing 30. The connection between the cooling medium sleeve 40 and the housing 30 can not only limit the cooling medium sleeve 40 but also firmly connect the two parts of the housing 30 together.

[0067] Among them, the cooling medium sleeve 40 and the housing 30 can be connected together by screws or bolts, and the cooling medium sleeve 40 can also be welded to the housing 30.

[0068] In practical applications, the two axial ends of the cooling medium sleeve 40 can also have ribs protruding axially outward. The ribs are butt-connected to the edge of the mounting opening. At this time, the ribs can be welded to the edge of the mounting opening. Alternatively, the ribs can be fitted to the inner surface of the peripheral wall of the mounting opening. At this time, screws or bolts can pass through the ribs and the peripheral wall of the mounting opening to connect the cooling medium sleeve 40 and the housing 30 together, and the ribs can also be welded to the inner surface of the peripheral wall of the mounting opening. Here, the welding part is hidden, and the appearance effect is good.

[0069] In another specific embodiment, referring to Figure 3, when the number of the cooling medium sleeves 40 is two and the number of the mounting openings is two, the housing 30 can be divided into left, middle, and right parts in the axial direction of the motor. The left side of the left cooling medium sleeve 40 is connected to the left part of the housing 30, and the right side of the left cooling medium sleeve 40 is connected to the connecting plate of the middle part of the housing 30. An installation opening is formed between the left part of the housing 30 and the connecting plate. The right side of the right cooling medium sleeve 40 is connected to the right part of the housing 30, and the left side of the right cooling medium sleeve 40 is connected to the connecting plate of the middle part of the housing 30. Another installation opening is formed between the right part of the housing 30 and the connecting plate. The connecting plate separates the two installation openings, and the first ventilation opening is arranged on the connecting plate. Here, similar to the above embodiment, the cooling medium sleeve 40 can also be connected to the housing 30 by screws or bolts, or welded together. At least one end of each cooling medium sleeve 40 in the axial direction can also have a rib protruding axially outward, and the housing 30 is connected through the rib.

[0070] Of course, for the specific installation method of the cooling medium sleeve 40, in other embodiments, the housing 30 can also be an integral structure as a whole. After the housing 30 is sleeved on the outer periphery of the stator 10, the outer periphery of the cooling medium sleeve 40 is blocked. Small openings are additionally formed on the housing 30 to communicate with the liquid inlet and liquid outlet on the cooling medium sleeve 40 to supply cooling medium into the cooling medium sleeve 40. At this time, the cooling medium sleeve 40 is connected to the housing 30 on the inner side of the housing 30. The two ends of the cooling medium sleeve 40 in the axial direction can be connected to the housing 30 by bolts or screws, or the two ends of the cooling medium sleeve 40 in the axial direction can be welded to the housing 30.

[0071] Furthermore, the cooling medium sleeve 40 is shrink-fitted on the stator 10 or the cooling medium sleeve 40 is welded to the stator 10. The cooling medium sleeve 40 is firmly connected to the stator 10 and is not easy to move. Moreover, the cooling medium sleeve 40 can be in close contact with the stator 10, which is convenient for realizing heat exchange.

[0072] Furthermore, in some embodiments, the motor further includes: a cooler, arranged at the air inlet 320, for cooling the air flowing into the housing 30 through the air inlet 320; a fan, arranged at the air outlet 310 or the air inlet 320, for guiding the air to flow through a plurality of radial ventilation ducts 113 and axial ventilation ducts 210. It is beneficial to realize the cold air circulation and heat dissipation of the motor and improve the heat dissipation effect.

[0073] Further, in some embodiments, the cooling medium jacket 40 has multiple turns of circuits 410 circumferentially distributed around the stator 10. The cooling medium flows through the multiple turns of circuits 410. Two liquid inlets are provided on the circuits 410 at both ends of the multiple turns of circuits 410, and two liquid outlets are provided on the two middle circuits 410. This realizes the flow of the cooling medium from both sides of the cooling medium jacket 40 towards the middle, which is beneficial to evenly dissipate heat from the part of the stator core 110 covered by the cooling medium jacket 40. Moreover, the design of the two liquid inlets and two liquid outlets can increase the circulation speed of the cooling medium and improve the heat dissipation efficiency.

[0074] Of course, it is also possible to provide a liquid inlet on one end circuit 410 of the multiple turns of circuits 410 and a liquid outlet on the other end circuit 410. At this time, the cooling medium flows from one end of the cooling medium jacket 40 to the other end for cooling, which can reduce the pipelines connected to the liquid inlets and liquid outlets, simplify the structure, and save costs.

[0075] The following details a motor according to an embodiment of the present invention.

[0076] The motor includes a housing 30, a stator core 110, a stator winding 120, a rotor 20, etc.

[0077] The air gap between the rotor 20 and the stator 10 forms an axial ventilation duct 210.

[0078] The stator core 110 is divided into multiple parts, and the gaps between each part are configured as a radial ventilation duct 113.

[0079] A cooling medium jacket 40, such as a cooling water jacket, is connected to the housing 30. The cooling medium jacket 40 can be integrally connected or welded to the housing 30. The cooling medium jacket 40 can be located on both axial sides of the stator 10 or in the middle of the stator 10 axially.

[0080] A first ventilation opening is provided at a position on the housing 30 corresponding to the radial ventilation duct 113, which can serve as an air inlet 320 or an air outlet 310. The form of air intake from both ends and air outlet in the middle can be adopted, such as Figure 3 the cold air flow direction indicated by the arrow in Figure 4 or the cold air flow direction indicated by the arrow in

[0081] The air cooler is connected to the air inlet 320 for air cooling, and the fan is connected to the air outlet 310. The fan can guide the outside cold air to flow through the air cooler to be cooled and then enter the motor, and then flow out from the air outlet 310.

[0082] Coolant is introduced into the cooling medium jacket 40 to cool the corresponding parts of the stator core 110, the stator winding 120, and the rotor 20 together with the cold air passing through the axial ventilation duct 210.

[0083] Part of the stator 10 is cooled by liquid cooling and air cooling (including the radial ventilation ducts 113 and the axial ventilation ducts 210 here), specifically cooling the stator 10 iron core and the stator winding 120. Part of the rotor 20 is cooled by pure air cooling.

[0084] The number of the radial ventilation ducts 113 can be selected according to the axial length and temperature distribution of the motor. In order not to make the axial length of the stator core 110 too long, the axial length of the stator core 110 occupied by the radial ventilation ducts 113 should be less than 1 / 2 of the overall axial length of the stator core 110.

[0085] In addition, the setting position of the radial ventilation ducts 113 can be related to the positions of the air inlet 320 and the air outlet 310. For the cooling form with air inlet at both ends, generally the radial ventilation ducts 113 are placed in the middle position, as Figure 3 shown. When the positions of the air inlet 320 and the air outlet 310 as Figure 4 adopted, the radial ventilation ducts 113 are placed on the side close to the air outlet 310. The width of the radial ventilation ducts 113 is about 6 - 8 mm.

[0086] The liquid cooling and the air cooling are independent. The air path can be externally connected to a cooler so that the incoming air is always in a low - temperature state. The liquid cooling can be in the form of incoming from both sides and outgoing from the middle, or incoming from one end and outgoing from the other end.

[0087] In this embodiment, the motor is dissipated by heat through the combination of the radial ventilation ducts 113, the axial ventilation ducts 210 and the cooling medium sleeve 40. The motor has high environmental adaptability and can be applied to marine and on - land environments. Adding the cooling of the radial ventilation ducts 113 can make up for the problem of excessive temperature difference caused by all - axial ventilation. Adding the cooling medium sleeve 40 can make up for the problem of excessive axial length of the stator 10 and increased loss caused by all - radial ventilation. The radial ventilation ducts 113 are preferably placed at the part of the motor with the highest temperature, which is beneficial to the heat dissipation of the motor.

[0088] An embodiment of the second aspect of the present invention provides a wind power generating set, including: a motor as in any one of the above - mentioned embodiments.

[0089] The wind power generating set provided by the embodiment of this aspect has the beneficial effects of any one of the above - mentioned embodiments because it has the motor provided by any one of the above - mentioned embodiments, and will not be elaborated here.

[0090] Furthermore, the motor serves as the generator of the wind power generating set.

[0091] Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the present invention. It should be understood that, in the view of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention defined by the claims.

Claims

1. A motor, characterized in that, the motor includes a stator (10) and a rotor (20) arranged coaxially, there is an air gap between the stator (10) and the rotor (20), and the air gap forms an axial ventilation duct (210), the stator (10) is defined in the axial direction as at least one first axial segment (111) and at least one second axial segment (112), a cooling medium sleeve (40) is arranged on the outer periphery of each first axial segment (111), the cooling medium sleeve (40) is used for contact heat exchange with the first axial segment (111), there are a plurality of radially penetrating radial ventilation ducts (113) on each second axial segment (112), the cooling medium sleeve (40) and the plurality of radial ventilation ducts (113) are arranged alternately, one end of the radial ventilation duct (113) is communicated with the axial ventilation duct (210), and the other end of the radial ventilation duct (113) is communicated with the outside.

2. The motor according to claim 1, characterized in that, the motor further includes a housing (30), the stator (10) and the rotor (20) are arranged in the housing (30), a first ventilation opening is arranged at a position on the housing (30) corresponding to the second axial segment (112), the first ventilation opening is communicated with the plurality of radial ventilation ducts (113), and a second ventilation opening communicated with the axial ventilation duct (210) is further arranged on the housing (30).

3. The motor according to claim 2, characterized in that, the number of the first ventilation openings is the same as the number of the second axial segments (112), and each first ventilation opening includes at least one first sub-ventilation opening circumferentially distributed around the second axial segment (112), each of the radial ventilation ducts (113) is circumferentially distributed around the stator (10), and the plurality of radial ventilation ducts (113) are communicated with the outside through the at least one first sub-ventilation opening, the number of the second ventilation openings is two, and they are respectively located at both axial ends of the stator (10), and each second ventilation opening includes at least one second sub-ventilation opening circumferentially distributed around the stator (10), and any end of the axial ventilation duct (210) is communicated with the outside through the at least one second sub-ventilation opening, wherein, among all the first ventilation openings and the two second ventilation openings, at least two ventilation openings are air inlets (320), and the remaining ventilation openings are air outlets (310).

4. The motor according to claim 3, characterized in that, the number of the first axial segments (111) is one, the number of the second axial segments (112) is one, the first ventilation opening is an air inlet (320), and among the two second ventilation openings, the second ventilation opening axially far from the first axial segment (111) is an air outlet (310), and the second ventilation opening close to the first axial segment (111) is an air inlet (320).

5. The motor according to claim 3, characterized in that, There are two of the first axial segments (111), one in number of the second axial segments (112), the second axial segment (112) is located between the two first axial segments (111), the first ventilation opening is an air outlet (310), and the two second ventilation openings are air inlets (320).

6. The electric machine according to any one of claims 1 to 5, characterized in that the ratio of the total axial length L1 of all the second axial segments (112) to the axial length L of the stator (10) satisfies: 0 < L1 / L ≤ 0.5; and / or the width range of each radial ventilation duct (113) is from 6 mm to 10 mm.

7. The electric machine according to any one of claims 2 to 5, characterized in that the stator (10) is sleeved on the radially outer side of the rotor (20), the housing (30) is sleeved on the outer side of the stator (10), and the cooling medium sleeve (40) is fixedly connected to the housing (30).

8. The electric machine according to claim 7, characterized in that circumferentially distributed mounting openings are provided on the part of the housing (30) corresponding to the first axial segment (111), and the cooling medium sleeve (40) is arranged at the mounting openings; and / or the cooling medium sleeve (40) is shrink-fitted on the stator (10) or the cooling medium sleeve (40) is welded to the stator (10).

9. The electric machine according to claim 3, characterized in that the electric machine further includes: a cooler, arranged at the air inlet (320) for cooling the air flowing into the housing through the air inlet (320); a fan, arranged at the air outlet (310) or the air inlet (320) for guiding the air to flow through the plurality of radial ventilation ducts (113) and the axial ventilation duct (210).

10. The electric machine according to claim 1, characterized in that the cooling medium sleeve (40) has multiple loops (410) circumferentially distributed around the stator (10), the cooling medium is used to flow through the multiple loops (410), two liquid inlets are provided on the loops (410) at both ends of the multiple loops (410), two liquid outlets are provided on the two middle loops (410), or a liquid inlet is provided on the loop (410) at one end of the multiple loops (410), and a liquid outlet is provided on the loop (410) at the other end.

11. A wind power generating set, characterized in that it includes: an electric machine according to any one of claims 1 to 10.

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