Cover type oil cooling stator

Abstract

The utility model discloses a cover type oil cooling stator, which comprises an iron core and windings inserted in stator grooves of the iron core, the windings are provided with exposed end parts exposed out of two ends of the iron core, the cover type oil cooling stator further comprises a plastic insulating sheath and a cooling cover, the plastic insulating sheath is provided with insulating spacer bushes which are arranged in the stator grooves in an injection molding mode and wrap the windings, and the cooling cover is arranged in the plastic insulating sheath. Oil grooves which axially penetrate through the winding, are communicated with the surface of the winding and are used for introducing cooling oil are distributed around the winding on the inner surface of each insulating spacer bush; and the cooling covers are connected to the two ends of the iron core and cover the oil grooves and the exposed end parts. The stator has the advantages of being simple in manufacturing process, high in production efficiency and low in manufacturing cost, cooling oil can be led into the iron core to cool the part, located in the iron core, of the winding, and therefore heat can be rapidly dissipated when the stator works, the stator can be applied to occasions with the requirement for ultra-high-speed rotation, and the service life of the stator is prolonged. And the performance and service life of the motor are improved.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and relates to the stator of an electric motor, and more particularly to a shroud-type oil-cooled stator. Background Technology

[0002] The stator is a key component of an electric motor, mainly composed of an iron core and windings. The iron core has stator slots distributed along its circumference, and the windings are inserted into each stator slot. To prevent electrical breakdown, short circuits between windings, and reduced contact distance, traditional stators have insulating paper inserted into the stator slots to isolate them from the windings.

[0003] Traditional stators use insulating paper for insulation, requiring a dedicated step in the manufacturing process to insert the paper. This step is cumbersome, requiring each stator slot to be inserted individually, resulting in low production efficiency and high manufacturing costs. Furthermore, the use of insulating paper prevents oil cooling of the windings inside the core. Consequently, traditional stators suffer from insufficient heat dissipation during operation, significantly impacting performance and making them unsuitable for applications requiring ultra-high-speed rotation. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a shroud-type oil-cooled stator with high production efficiency and capable of oil cooling of the windings inside the iron core, so as to overcome the shortcomings of the existing technology.

[0005] A shroud-type oil-cooled stator includes an iron core and windings inserted into various stator slots of the iron core. The windings have exposed ends that protrude from both ends of the iron core. The stator is characterized by further including a plastic insulating sleeve and a cooling shroud. The plastic insulating sleeve has insulating spacers injection-molded into each of the stator slots and enclosing the windings. The inner surface of each insulating spacer has axially penetrating oil grooves that communicate with the surface of the windings for the passage of cooling oil. The cooling shroud is connected to both ends of the iron core and covers the oil grooves and the exposed ends.

[0006] By adopting the above technical solution, this utility model uses a plastic insulating sleeve, which is injection-molded into each stator slot and wraps around the winding. The inner surface of the insulating sleeve is provided with an axially penetrating oil groove that surrounds the winding and communicates with the winding surface. On the one hand, since the plastic insulating sleeve can be directly injection-molded into the stator slot of the iron core, the process is simple and the production efficiency is high. On the other hand, since the insulating sleeve is made of plastic, oil grooves can be made on the plastic. Cooling oil can be introduced into the oil grooves to cool the winding, thereby removing the heat generated during the winding operation. This allows the stator to dissipate heat in time during operation, enabling the stator to be used in applications requiring ultra-high speed rotation, thus improving the performance and lifespan of the motor.

[0007] In this invention, the plastic insulating sleeve further comprises insulating end plates located at both ends of the insulating sleeve and covering the end faces of the iron core, and the cooling cover is welded to the insulating end plates. The addition of insulating end plates to the plastic insulating sleeve reduces axial shrinkage during injection molding and prevents axial displacement during copper wire insertion; additionally, it provides welding support for the insulating end plates.

[0008] In this invention, the two end faces of the iron core are radially divided into an inner ring end face and an outer ring protrusion protruding from the inner ring end face. The insulating end plate covers the inner ring end face, and the surface of the insulating end plate is flush with the surface of the outer ring protrusion.

[0009] In this invention, the iron core is divided into an upper section and a lower section along the axial direction, and the plastic insulating sleeve also has an insulating partition located in the middle of the insulating sleeve and spaced between the upper and lower sections. This added insulating partition can further reduce axial shrinkage during the injection molding process.

[0010] In this invention, the iron core is radially divided into an inner ring groove and an outer ring connecting part located outside the inner ring groove and connecting the upper and lower sections at the axial middle position, and the insulating partition is located in the inner ring groove.

[0011] In this invention, the winding is composed of multiple flat wires arranged in a row, and the oil groove is located at the apex corner of each flat wire. Positioning the oil groove at the apex corner of each flat wire avoids contact between the plastic insulating sheath and the four corners of the flat wire, thus preventing the insulating sheath from scratching the insulating varnish of the winding during insertion.

[0012] In this invention, both the upper and lower sections are formed by stacking complete silicon steel sheets, while the outer ring protrusion and the outer ring connecting portion are formed by stacking incomplete silicon steel sheets. The complete silicon steel sheets have an inner annular region and an outer annular region radially. The inner annular region has stator slots that, after stacking, form stator slots at equal intervals circumferentially. The incomplete silicon steel sheets only have the outer annular region and not the inner annular region. By stacking complete and incomplete silicon steel sheets, the manufactured core has outer ring protrusions at both ends and an inner ring groove at the axial midpoint. This allows the injection-molded plastic insulating sleeve to have an insulating end plate and a middle partition plate integrally formed with the insulating spacer.

[0013] By adopting the above technical solution, it can be seen that the shroud-type oil-cooled stator of this utility model has the advantages of simple manufacturing process, high production efficiency and low manufacturing cost. It can also realize the cooling of the part of the winding located inside the iron core by circulating cooling oil into the iron core, thereby enabling the stator to dissipate heat quickly during operation. This allows the stator to be used in applications with ultra-high speed rotation requirements, improving the performance and life of the motor. Attached Figure Description

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0015] Figure 1 This is a three-dimensional schematic diagram of the stator of this utility model;

[0016] Figure 2 This is an exploded view of the stator of this utility model;

[0017] Figure 3 This is a three-dimensional schematic diagram of the iron core of this utility model;

[0018] Figure 4 This is an exploded view of the iron core of this utility model;

[0019] Figure 5 This is a top-view enlarged view of the stator of this utility model located at the stator slot;

[0020] Figure 6 This is a structural cross-sectional view of the shroud-type oil-cooled stator of this utility model;

[0021] Figure 7 This is another structural cross-sectional view of the shroud-type oil-cooled stator of this utility model. Detailed Implementation

[0022] like Figure 6 and Figure 7 As shown, the shroud-type oil-cooled stator of this utility model includes a stator and two cooling shrouds 100 respectively connected to both ends of the stator.

[0023] Among them, such as Figure 1 and Figure 2 As shown, the stator includes an iron core 100, a winding 200, and a plastic insulating sheath 300.

[0024] Combination Figure 3 and Figure 4The core 100 is made of stacked silicon steel sheets. The core 100 has a cylindrical structure with an axially extending rotor receiving cavity 107 inside. Axially penetrating stator slots 101 are distributed circumferentially at intervals on the end face of the core 100. In this embodiment, the core 100 is axially divided into an upper section 110 and a lower section 120. The end faces at both ends of the core 100 are radially divided into an inner ring end face 102 and an outer ring protrusion 103 protruding from the inner ring end face 102. At the axial midpoint of the core 100, it is radially divided into an inner ring groove 104 and an outer ring connecting portion 105 located around the inner ring groove 104 and connecting the upper section 110 and the lower section 120.

[0025] Specifically, the upper section 110 and the lower section 120 are both formed by stacking complete silicon steel sheets; the outer ring protrusion 103 and the outer ring connecting portion 105 are both formed by stacking incomplete silicon steel sheets, thus forming the core structure described above in this embodiment. A complete silicon steel sheet refers to a silicon steel sheet containing stator slots 133. This complete silicon steel sheet is radially divided into an inner annular region 131 and an outer annular region 132, wherein the stator slots 133 are circumferentially spaced on the inner annular region 131. An incomplete silicon steel sheet refers to a silicon steel sheet that does not contain stator slots 133; this incomplete silicon steel sheet only has an outer annular region 132 and does not have an inner annular region 131.

[0026] Furthermore, the inner diameter edge of the complete silicon steel sheet also has a notch connecting the central hole and the stator slot 133, thus creating an axially extending slot 106 on the inner diameter edge of the stacked iron core. This slot 106 connects the rotor receiving cavity 107 and the stator slot 101. In this embodiment, the cross-section of the stator slot 101 is rectangular, that is, the stator slot 133 is rectangular.

[0027] For example Figure 2 As shown, the plastic insulating sleeve 300 is an integral structure, injection molded and fixed in the iron core 100. It has insulating spacers 310 located in each stator slot 101, insulating end plates 320 connected to both ends of the insulating spacers 310, and an insulating partition 330 connected to the axial center of the insulating spacers 310. The insulating end plates 320 are embedded in the inner ring end face 102 of the iron core 100, and their surfaces are flush with the surface of the outer ring protrusion 103. The insulating partition 330 is embedded in the inner ring groove 104 of the iron core 100. Due to the positioning of the insulating end plates 320 and the insulating partition 330, the plastic insulating sleeve 300 will not experience axial shrinkage during injection molding, and the entire plastic insulating sleeve 300 is firmly fixed in the iron core 100, eliminating the risk of detachment and preventing axial displacement during copper wire insertion.

[0028] In addition, the inner diameter surface of the plastic insulating sheath 300 is also fitted with ribs 301 in the groove 106. These ribs 301 can further improve the strength of the plastic insulating sheath 300.

[0029] Combination Figure 5 As shown, the winding 200 is inserted into the insulating spacer 310 of the plastic insulating sheath 300. The insulating spacer 310 serves to insulate the slot portion of the winding 200 from the iron core 100. The slot portion of the winding 200 is composed of multiple rectangular flat wires 201 arranged in a row.

[0030] To cool the winding, the inner surface of the insulating sleeve 310 is provided with oil grooves 311 at intervals around the slots of the winding 200 for passing cooling oil. Each oil groove 311 has an opening 312 facing the slot of the winding 200, allowing the oil groove 311 to communicate with the slot of the winding 200. Thus, when cooling oil flows through the oil grooves 311, it contacts the winding surface, carrying away heat from the slot of the winding 200 and cooling it. In this embodiment, each oil groove 311 is located at one of the apex corners of the flat wire 201. This distribution of the oil grooves 310 avoids contact between the plastic insulating sleeve 300 and the four corners of the flat wire 201, preventing scratches to the insulating varnish of the winding 200.

[0031] After the winding 200 is inserted into the iron core 100, both ends have exposed ends 202 protruding outside the iron core 100. Therefore, as... Figure 6 As shown, two cooling covers 400 respectively cover the two exposed ends 202 and the oil tank 310. Each cooling cover 400 is integrally formed by an inner ring wall 401, an outer ring wall 402, and a top wall 403 connecting the outer ends of the inner ring wall 401 and the outer ends of the outer ring wall 402. The cooling cover 400 is also made of insulating plastic, and can be made of the same plastic material as the plastic insulating sheath 200.

[0032] By welding the inner end of the inner ring wall 401 and the inner end of the outer ring wall 402 together with the insulating end plate 320 of the plastic insulating sheath 200, an annular cooling cavity 404 connecting each oil groove 310 is formed between the cooling cover 400 and the exposed end 202 of the iron core 100.

[0033] In this embodiment, one of the two cooling shrouds 400 at both ends of the iron core 100 has an oil inlet 501, and the other has an oil outlet 502. Cooling oil can enter the cooling shroud 400 through the oil inlet 501, first cooling the exposed end 202 of the winding in that shroud 400, then entering the oil groove 310 inside the iron core 100 to cool the winding portion inside the iron core 100, then flowing into the other cooling shroud 400 to cool the exposed end 202 of the winding in that shroud 400, and finally flowing out from the oil outlet 502.

[0034] In other embodiments, such as Figure 7 As shown, oil outlets 502 can be provided on both cooling shrouds 400, and oil inlets 501 leading to oil grooves 310 can be opened on the outer surface of the iron core 100 at the axial middle position. In this way, cooling oil is introduced into the oil grooves 310 from the middle position of the iron core 100. The cooling oil entering the oil grooves 310 then flows to both ends of the iron core 100 to cool the winding part inside the iron core 100. Finally, it enters the cooling chambers 404 of the cooling shrouds 400 at both ends to cool the exposed ends 202 of the windings before flowing out from the oil outlets 502.

[0035] The above describes the bell-type oil-cooled stator of this utility model, and its manufacturing method is as follows:

[0036] First, after placing the core mold in each stator slot of the iron core, place them together in the injection mold to form a cavity with the shape of a plastic insulating sheath in the injection mold;

[0037] Then, after the molten plastic is injected into the cavity and cooled, the injection molding assembly is opened and the core mold is pulled out, resulting in a plastic insulating sheath fixed in the iron core.

[0038] Then, the windings are inserted into each insulating spacer of the plastic insulating sheath;

[0039] Finally, the prepared cooling cover is welded to the insulating end plates of the plastic insulating sheaths at both ends of the iron core, covering the exposed ends of the winding and the oil groove.

[0040] As can be seen from the above detailed description, the shroud-type oil-cooled stator of this utility model can use injection molding to fix the plastic insulating sleeve in the stator slot of the iron core to replace the insulating paper to achieve insulation between the winding and the iron core. Compared with the traditional method of using insulating paper, the process is simple and the production efficiency is high, which helps to reduce the cost of stator manufacturing. In addition, the use of plastic insulating sleeve can also realize the circulation of cooling oil into the iron core to cool the part of the winding located inside the iron core, thereby enabling the stator to dissipate heat quickly during operation. This allows the stator to be used in applications requiring ultra-high speed rotation, improving the performance and life of the motor.

Claims

1. A shroud-type oil-cooled stator, comprising an iron core and windings inserted into various stator slots of the iron core, the windings having exposed ends protruding from both ends of the iron core, characterized in that: It also includes a plastic insulating sleeve and a cooling cover. The plastic insulating sleeve has an insulating spacer that is injection molded into each of the stator slots and wraps around the winding. Each insulating spacer has an oil groove that is axially distributed around the winding and communicates with the surface of the winding for passing through the oil groove. The cooling cover is connected to both ends of the iron core and covers the oil groove and the exposed end.

2. The bell-type oil-cooled stator according to claim 1, characterized in that: The plastic insulating sheath also has insulating end plates located at both ends of the insulating sleeve and covering the end faces of both ends of the iron core, and the cooling cover is welded to the insulating end plates.

3. The shroud-type oil-cooled stator according to claim 2, characterized in that: The two end faces of the iron core are radially divided into an inner ring end face and an outer ring protrusion protruding from the inner ring end face. The insulating end plate covers the inner ring end face, and the surface of the insulating end plate is flush with the surface of the outer ring protrusion.

4. The bell-type oil-cooled stator according to claim 1, characterized in that: The iron core is divided into an upper section and a lower section along the axial direction, and the plastic insulating sleeve also has an insulating partition located in the middle of the insulating sleeve and spaced between the upper section and the lower section.

5. The shroud-type oil-cooled stator according to claim 4, characterized in that: The iron core is radially divided into an inner ring groove and an outer ring connecting part located outside the inner ring groove and connecting the upper and lower sections at the axial middle position. The insulating partition is located in the inner ring groove.

6. The bell-type oil-cooled stator according to claim 1, characterized in that: The winding is composed of multiple flat wires arranged in a row, and the oil groove is located at the apex of each flat wire.

7. The shroud-type oil-cooled stator according to claim 6, characterized in that: The oil trough has an opening facing the winding.

Images