Oil-cooled motor stator and motor

Abstract

The utility model relates to an oil-cooled motor stator and motor, including a stator core, a stator winding, a channel and an oil spray component, wherein the channel is provided on the stator core for circulating cooling oil; the oil spray component is arranged at both ends of the stator core, the oil spray component is coaxially arranged with the stator core and its size matches the size of the stator core, the oil spray component includes a plurality of protrusions recessed into its inner surface and protruding from its outer surface, the plurality of protrusions are distributed along the circumference of the oil spray component and each of the protrusions is fluidly connected to the channel, each of the protrusions extends toward the stator winding to a preset position and an oil spray hole is provided near the preset position, and the cooling oil flowing through the channel flows into the protrusion of the oil spray component and is sprayed from the oil spray hole onto the stator winding. The stator structure of the utility model does not need to be provided with additional oil spray rings and oil distribution components, and almost no loss of silicon steel sheet magnetic circuit is achieved, with little impact on electromagnetic performance.

Description

Technical Field

[0001] The utility model relates to the field of motor cooling, in particular to an oil-cooled motor stator and a motor. Background Art

[0002] During the high-speed rotation of the motor, its heat source is mainly concentrated in the winding and core of the motor stator. If it works in a high-temperature environment for a long time, it will seriously affect and reduce the working efficiency and service life of the motor. The development of drive motors pursues higher power density and puts forward higher requirements for the cooling of the motor. At present, oil-cooled motors have become the mainstream technology for motor cooling due to their excellent cooling effect. One way of existing oil-cooled motors is to add oil spray rings or oil distribution components at both ends of the stator core to spray oil on the stator winding to achieve cooling of the stator core and stator winding. This method requires the installation of additional components, increases production costs and has poor reliability; another way is to set an inclined oil spray channel at the end of the stator core. The oil spray channel is realized by a lamination process. The lamination process is complicated and the oil circuit pressure drop is relatively large. Summary of the invention

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] According to a first aspect of an embodiment of the utility model, there is provided an oil-cooled motor stator, comprising a stator core, a stator winding, a channel and an oil injection component;

[0005] Wherein, a channel is opened on the stator core for circulating cooling oil;

[0006] The oil injection component is arranged at both ends of the stator core. The oil injection component is coaxially arranged with the stator core and its size matches the size of the stator core. The oil injection component includes a plurality of protrusions recessed into its inner surface and protruding from its outer surface. The plurality of protrusions are distributed along the circumference of the oil injection component and each of the protrusions is fluidly connected to the channel. Each of the protrusions extends toward the stator winding to a preset position and is provided with an oil injection hole near the preset position. The cooling oil flowing through the channel flows into the protrusion of the oil injection component and is sprayed from the oil injection hole onto the stator winding.

[0007] In some embodiments, each of the protrusions tapers toward the stator winding.

[0008] In some embodiments, the end of the protrusion with a wider dimension is fluidically connected to the channel, and the oil injection hole is close to the end of the protrusion with a narrower dimension.

[0009] In some embodiments, an opening direction of each of the oil injection holes is parallel to the axial direction of the stator core.

[0010] In some embodiments, each of the protrusions extends toward the stator winding to between positions of the oil injection component corresponding to two adjacent slots of the stator core.

[0011] In some embodiments, the oil injection component is an annular structure, and the oil injection component includes a plurality of slots near its inner circumference, the plurality of slots are arranged in one-to-one correspondence with the slots of the stator core, and each of the protrusions extends between two adjacent slots of the oil injection component.

[0012] In some embodiments, the outer peripheral surface of the oil injection component is sealed with the stator housing, the oil injection component, the outer surface of the stator core and the housing form a cavity, and the channel is opened on the outer surface of the stator core.

[0013] In some embodiments, the channel is located inside the stator core, the outer peripheral surface of the oil injection component is sealed and connected to the stator core, and the cooling oil flowing out from the inside of the stator core directly flows into the protrusion and is sprayed from the oil injection hole onto the stator winding.

[0014] In some embodiments, the size of the oil injection hole located in the upper half of the stator core is larger than the size of the oil injection hole located in the lower half of the stator core.

[0015] According to a second aspect of an embodiment of the utility model, a motor is provided, comprising an oil-cooled motor stator as described in any one of the above embodiments.

[0016] The utility model has the beneficial effects:

[0017] By providing an oil injection component with a protrusion and providing an oil injection hole at the end of the protrusion, cooling oil can be sprayed onto the stator winding along the axial direction of the stator to cool the stator winding. There is no need to provide additional oil injection rings and oil separation components, etc., and there is almost no loss of the magnetic circuit of the silicon steel sheet, which has little effect on the electromagnetic performance.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features and advantages of the present invention are described below, which explains the present invention in more detail based on embodiments in conjunction with the accompanying drawings.

[0020] Figure 1 It is a cross-sectional view of an oil-cooled motor stator according to an embodiment of the utility model;

[0021] Figure 2It is a structural schematic diagram of a fuel injection component from a certain perspective according to an embodiment of the utility model;

[0022] Figure 3 It is a structural schematic diagram of an oil injection component from another perspective according to an embodiment of the utility model;

[0023] Figure 4 for Figure 3 A magnified view of region A in FIG.

[0024] Figure 5 An exploded view of a stator core of an oil-cooled motor stator according to an embodiment of the utility model;

[0025] Figure 6 The present invention is a flow path diagram of cooling oil for an oil-cooled motor stator according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 100. oil-cooled motor stator; 110. stator core; 111. slot; 120. stator winding; 130. oil injection component; 131. protrusion; 132. oil injection hole; 133. slot; 140. cavity; 141. channel; 150. housing; 151. oil inlet hole. DETAILED DESCRIPTION

[0028] The preferred implementation of the utility model is described below with reference to the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, not all of the embodiments.

[0029] See also Figure 1-Figure 5The utility model provides an oil-cooled motor stator 100, including a stator core 110, a stator winding 120, an oil spraying component 130 and a housing 150. The stator core 110 and the stator winding 120 are located inside the housing 150. The stator core 110 is provided with a channel 141 for circulating cooling oil. The channel 141 can be located on the outer surface of the stator core 110 or inside the stator core 110. The utility model does not impose any specific restrictions on this, as long as the cooling oil can flow on the stator core 110 to cool the stator core 110. The oil spraying component 130 is arranged at both ends of the stator core 110. The oil spraying component 130 is coaxially arranged with the stator core 110 and its size matches the size of the stator core 110. The oil spraying component 130 can cover the outlet of the channel 141. The oil injection component 130 includes a plurality of protrusions 131 that are recessed into the inner surface of the oil injection component and protrude from the outer surface of the oil injection component, wherein the inner surface of the oil injection component is the surface of the oil injection component 130 close to the stator core 110, and the outer surface of the oil injection component is the surface of the oil injection component 130 away from the stator core 110. The plurality of protrusions 131 are distributed along the circumference of the oil injection component 130, and one end of each protrusion 131 is connected to the fluid communication channel 141, and the other end of each protrusion 131 extends toward the stator core 110 to a preset position and is provided with an oil injection hole 132 near the preset position. The cooling oil flowing through the channel 141 flows into the protrusion 131 of the oil injection component 130 and is sprayed from the oil injection hole 132 onto the stator winding 120 to achieve cooling of the stator winding 120.

[0030] In the above implementation process, by providing an oil spray component with a protrusion, the protrusion can first collect the cooling oil and then spray it out from the oil spray hole close to the stator winding. This structure does not require the provision of an additional oil spray ring, etc., and realizes the cooling oil sprayed from the axial direction of the stator to the stator winding to cool the stator winding, thereby improving the cooling effect. In addition, the oil spray holes are only provided at both ends of the stator core, and the magnetic circuit of the silicon steel sheet is almost not lost, which has little effect on the electromagnetic performance.

[0031] In some embodiments, in order to further collect cooling oil and improve the effect of oil injection, each protrusion 131 gradually narrows toward the stator winding 120. That is, each protrusion 131 gradually narrows from its end away from the stator winding 120 to a preset position. Figure 5, the size of the end of the protrusion 131 away from the stator winding 120 along the circumferential direction of the stator core 110 is larger than the size of the preset position along the circumferential direction of the stator core 110. Through this design, the cooling oil flowing along the channel 141 flows into the protrusion 131 along the large-diameter end (i.e., the end of the protrusion 131 away from the stator winding 120), so that a large amount of cooling oil is quickly collected and then sprayed out from the small-diameter end (i.e., the end of the protrusion 131 at the preset position), which can increase the oil pressure and realize the cooling oil spraying onto the stator winding 120 along the axial direction of the stator, further improving the cooling effect. For example, see Figure 4 , each protrusion 131 is funnel-shaped.

[0032] In some embodiments, the wider end of the protrusion 131 is connected to the fluid channel 141, and the oil injection hole 132 is located at the narrower end of the protrusion 131, so as to spray cooling oil from the axial direction of the stator onto the stator winding to cool the stator winding.

[0033] Furthermore, the opening direction of each oil injection hole 132 is parallel to the axial direction of the stator core 110, so that the injection direction of the oil injection hole 132 is basically parallel to the stator core 110, ensuring that the cooling oil is sprayed along the axial direction of the stator, thereby improving the cooling effect of the stator winding.

[0034] Figure 5 FIG. 1 is an exploded view of a stator core of an oil-cooled motor stator according to an embodiment of the utility model. Figure 5 Each protrusion 131 extends toward the stator core 110 to the position of the oil injection component 130 corresponding to two adjacent slots 111 of the stator core 110, so that the oil injection holes 132 are sequentially located between two adjacent stator windings 120 on the stator core 110, so that the cooling oil sprayed from the oil injection holes 132 can be directly sprayed between the stator windings 120, further improving the cooling effect. At the same time, the oil injection holes are opened at a wider position corresponding to the teeth of the stator core, which has less impact on the electromagnetic performance.

[0035] In some embodiments, the oil injection component 130 is an annular structure, and the oil injection component 130 includes a plurality of slots 133 near its inner circumference, and the plurality of slots 133 correspond one-to-one to the slots 111 of the stator core 110, and the small-diameter end of each protrusion 131 extends between two adjacent slots 133 of the oil injection component 130, that is, the oil injection component 130 can be made of the same annular silicon steel sheet as the stator core 110, and there is no need to make a special design for the oil injection component 130. Except for the protrusion structure on the surface, other structures can be designed according to the structure of the stator core 110.

[0036] In some embodiments, see Figure 1The outer peripheral surface of the oil injection component 130 is sealed and connected to the stator housing 150. The outer surface of the oil injection component 130, the stator core 110 and the inner surface of the housing 150 form a cavity 140. The channel 141 is opened on the outer surface of the stator core 110, that is, the channel 141 is also located in the cavity 140. The cooling oil flowing into the cavity 140 flows into the channel 141. The end of the protrusion 131 away from the stator winding 120 is arranged close to the channel 141. The cooling oil flows from the channel 141 along the end of the protrusion 131 away from the stator winding into the protrusion 131. Before entering the protrusion 131, the cooling oil can flow in the cavity 140 and the channel 141 to cool the stator core 110. After entering the protrusion 131, the cooling oil is sprayed from the oil injection hole 132 onto the stator winding 120 to cool the stator winding 120.

[0037] In other embodiments, the channel 141 may be located inside the stator core 110, that is, the channel 141 may be opened inside the stator core 110, and the cooling oil flows from the surface of the stator core 110 into the channel 141 inside the stator core 110, and the oil spraying component 130 may be a part of the silicon steel sheet of the stator core 110. The outer peripheral surface of the oil spraying component 130 is sealed and connected to the stator core 110, and the cooling oil flowing out of the channel 141 inside the stator core 110 directly flows into the protrusion 131, and is sprayed from the oil spraying hole 132 in the protrusion 131 onto the stator winding 120. Of course, the arrangement position of the channel 141 in the utility model can be adjusted according to actual needs, and the utility model does not impose specific restrictions on this, as long as the cooling of the stator core 110 can be achieved.

[0038] In the above implementation process, the oil injection component 130 can be two silicon steel sheets respectively located at the two ends of the stator core 110, that is, a silicon steel sheet with a protrusion is arranged at each end of the stator core 110. The oil injection component 130 can also be four silicon steel sheets respectively located at the two ends of the stator core 110, that is, two silicon steel sheets with a protrusion are arranged at each end of the stator core 110. Specifically, several silicon steel sheets with a protrusion are arranged at each end of the stator core 110, which can be set according to actual needs, and the present utility model does not impose specific restrictions on this.

[0039] In some embodiments, reference Figure 1 The housing 150 includes an oil inlet hole 151, and external cooling oil enters the interior of the housing 150 through the oil inlet hole 151. The cooling oil entering the housing 150 from the oil inlet hole 151 can flow in the cavity 140 between the housing 150 and the stator core 110, or the cooling oil entering the housing 150 from the oil inlet hole 151 directly enters the channel 141 inside the stator core 110, so as to flow in the channel 141 on the stator core 110.

[0040] In some embodiments, the size of the oil injection holes 132 located in the upper half of the stator core 110 is greater than the size of the oil injection holes 132 located in the lower half of the stator core 110 . Among them, the upper half of the stator core 110 when it is located inside the motor is the upper half of the stator core 110, and the lower half of the stator core 110 when it is located inside the motor is the lower half of the stator core 110. Under the action of gravity, the cooling oil sprayed from the oil injection hole 132 located in the upper half of the stator core 110 can flow to the lower half of the stator core 110, so that the stator winding 120 can also be cooled. Therefore, in order to improve the uniformity of cooling, the size of the oil injection hole 132 located in the upper half of the stator core 110 can be larger than the size of the oil injection hole 132 located in the lower half of the stator core 110, so as to reduce the amount of oil sprayed in the lower half of the stator core 110, thereby balancing the amount of cooling oil on the stator winding 120 located in the upper and lower halves of the stator core 110.

[0041] In other embodiments, the number of the oil injection holes 132 located in the upper half of the stator core 110 may be greater than the number of the oil injection holes 132 located in the lower half of the stator core 110. Specifically, the number of the oil injection holes 132 located in the lower half of the stator core 110 may be reduced according to the actual flow direction of the cooling oil.

[0042] In the above implementation process, the flow path of the cooling oil in the stator is as follows: Figure 6 As shown by the middle arrow, taking the case where the channel 141 is opened on the outer surface of the stator core 110 as an example, the external cooling oil enters the housing 150 from the oil inlet hole 151, that is, enters the cavity 140 formed by the housing 150, the oil injection component 130 and the stator core 110, and flows along the channel 141 on the outer surface of the inner stator core 110 in the cavity 140. The stator core 110 is respectively provided with oil injection components 130 at both ends, and the protrusions 131 of the oil injection component 130 are arranged corresponding to the channel 141, that is, the two ends of the channel 141 are respectively connected to the corresponding protrusions 131 of the oil injection component 130, and the cooling oil in the channel 141 flows into the protrusion 131 through the wider end of the protrusion 131, and after being collected in the protrusion 131, it is sprayed from the oil injection hole 132 along the axial direction of the stator (which can also be described as the axial direction of the stator core 110) onto the stator winding 120, thereby realizing the axial cooling of the stator winding 120. The entire cooling process does not require the setting of additional oil injection rings or oil distribution components, and since the oil injection holes 132 are only set at the two ends of the stator core and opened at the wider position of the teeth of the stator core, the magnetic circuit of the silicon steel sheet is almost not lost, and the impact on the electromagnetic performance is small.

[0043] In addition, the utility model further provides a motor, comprising the oil-cooled motor stator 100 as described in any of the above embodiments. The motor has the same advantages as the above oil-cooled motor stator 100, so it is not described in detail.

[0044] It should be noted that the terms "upper", "lower", "left", "right", "front", "back" and similar expressions used in this document are for illustrative purposes only and are not limitations of the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An oil-cooled motor stator (100), comprising a stator core (110) and a stator winding (120), characterized in that: Also includes: A channel (141) is provided on the stator core (110) and is used for circulating cooling oil; An oil spray component (130) is arranged at both ends of the stator core (110). The oil spray component (130) is coaxially arranged with the stator core (110) and its size matches the size of the stator core (110). The oil spray component (130) comprises a plurality of protrusions (131) which are recessed into its inner surface and protruded from its outer surface. The plurality of protrusions (131) are distributed along the circumference of the oil spray component (130) and each of the protrusions (131) is fluidically connected to the channel (141). Each of the protrusions (131) extends toward the stator winding (120) to a preset position and is provided with an oil spray hole (132) near the preset position. The cooling oil flowing through the channel (141) flows into the protrusion (131) of the oil spray component (130) and is sprayed from the oil spray hole (132) onto the stator winding (120).

2. The oil-cooled motor stator (100) according to claim 1, characterized in that: Each of the protrusions (131) gradually narrows toward the stator winding (120).

3. The oil-cooled motor stator (100) according to claim 2, characterized in that: The end of the protrusion (131) with a wider dimension is fluidically connected to the channel, and the oil injection hole (132) is close to the end of the protrusion (131) with a narrower dimension.

4. The oil-cooled motor stator (100) according to claim 1 or 2, characterized in that: The opening direction of each of the oil injection holes (132) is parallel to the axial direction of the stator core (110).

5. The oil-cooled motor stator according to claim 1, characterized in that: Each of the protrusions (131) extends toward the stator winding (120) to between positions of the oil injection component (130) corresponding to two adjacent slots (111) of the stator core (110).

6. The oil-cooled motor stator (100) according to claim 5, characterized in that: The oil injection component (130) is an annular structure. The oil injection component (130) includes a plurality of slots (133) near its inner circumference. The plurality of slots (133) are arranged in one-to-one correspondence with the slots (111) of the stator core (110). Each of the protrusions (131) extends between two adjacent slots (133) of the oil injection component (130).

7. The oil-cooled motor stator (100) according to claim 1, characterized in that: The outer peripheral surface of the oil injection component (130) is sealedly connected to the stator housing (150); the oil injection component (130), the outer surface of the stator core (110) and the housing (150) form a cavity (140); and the channel (141) is opened on the outer surface of the stator core (110).

8. The oil-cooled motor stator (100) according to claim 1, characterized in that: The channel (141) is located inside the stator core (110), and the outer peripheral surface of the oil injection component (130) is sealed and connected to the stator core (110). The cooling oil flowing out from the inside of the stator core (110) directly flows into the protrusion (131) and is sprayed from the oil injection hole (132) onto the stator winding (120).

9. The oil-cooled motor stator (100) according to claim 1, characterized in that: The size of the oil injection hole (132) located in the upper half of the stator core (110) is larger than the size of the oil injection hole (132) located in the lower half of the stator core (110).

10. A motor, characterized in that: It comprises an oil-cooled motor stator (100) as claimed in any one of claims 1 to 9.

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