CN118316213A - Stator, motor and wind generating set - Google Patents

Abstract

The present disclosure provides a stator, a motor and a wind generating set, the stator comprising: a stator core including a plurality of stator laminations stacked in an axial direction of the stator, each of the stator laminations including lamination teeth, lamination yokes, and lamination slots formed between adjacent lamination teeth; a winding including a coil disposed in the lamination slot; and the side edge of each punching tooth facing the adjacent punching tooth is provided with an oil through groove, and the oil through grooves on the stator punching sheets are aligned in the axial direction and form a first oil passage communicated in the axial direction with coils arranged in the punching grooves. Through the stator, the oil coolant can be directly contacted with heating components (such as a stator core and a coil) of the stator, so that the cooling efficiency is improved, the contact area is increased, and the heat dissipation capacity is further improved.

Description

Stator, motor and wind generating set

Technical Field

The present disclosure relates to the field of electric machines, and more particularly to stators, electric machines, and wind turbine generator sets.

Background

An oil-cooled motor is an emerging motor cooling system in recent years, and unlike refrigerants such as air cooling and water cooling, oil cooling generally directly acts on a heating component, so that the maximization of heat dissipation efficiency and the miniaturization of volume are realized. The oil itself has no influence on the magnetic circuit of the motor because of the characteristics of partial non-magnetic conduction, nonflammability, non-electric conduction and good heat conduction, so the oil cooling technology with high heat dissipation efficiency becomes a research hot spot.

Compared with water cooling, the oil cooling motor can directly cool the winding end part with the highest temperature on the stator, especially the flat wire winding with larger exposed area of the end part has more obvious effect, better cooling effect, good insulating property, higher boiling point than water and lower condensation point than water, so that the cooling liquid is not easy to freeze at low temperature and not easy to boil at high temperature.

Disclosure of Invention

The present disclosure is directed to a stator that may have an oil cooling structure that may allow an oil coolant to directly contact heat generating components of the stator (e.g., a stator core and a coil), improving cooling efficiency, increasing a contact area, and thus improving heat dissipation capability.

Further, the present disclosure aims to provide a stator that may have an oil passage that is simple in manufacturing process and uniform in cooling.

In addition, the present disclosure is directed to a stator that can have a large contact area between a stator core and a stator frame, and thus is firmly assembled and has a strong torque resistance.

According to an aspect of the present disclosure, there is provided a stator including: a stator core including a plurality of stator laminations stacked in an axial direction of the stator, each of the stator laminations including lamination teeth, lamination yokes, and lamination slots formed between adjacent lamination teeth; a winding including a coil disposed in the lamination slot; and the side edge of each punching tooth facing the adjacent punching tooth is provided with an oil through groove, and the oil through grooves on the stator punching sheets are aligned in the axial direction and form a first oil passage communicated in the axial direction with coils arranged in the punching grooves.

Preferably, the stator may further include a stator frame, the stator core may be disposed radially inward of the stator frame, wherein a rib groove may be provided on a radially outer circumferential edge of each of the stator laminations for receiving a rib extending in the axial direction, wherein the rib groove on each of the stator laminations may be aligned in the axial direction and form a second oil passage penetrating in the axial direction with a radially inner circumferential surface of the stator frame.

Preferably, an oil hole may be formed in a lamination yoke of each stator lamination, and the oil holes on each stator lamination may be aligned in the axial direction and form a third oil passage penetrating in the axial direction.

Preferably, the stator housing may include a housing outer cylinder and a housing inner ring disposed radially inward of the housing outer cylinder, and the entire outer cylindrical surface of the stator core may be in contact with a radially inner circumferential surface of the housing inner ring.

Preferably, an axial end of the housing inner ring may be provided with a positioning step protruding radially inward from a radially inner peripheral surface of the housing inner ring to axially abut against an axial end of the stator core.

Preferably, the positioning step may be provided with a recess at least partially aligned with the rib slot of each stator lamination.

Preferably, the stator may further include a set of tooth pressing plates disposed at both axial ends of the plurality of stator laminations to clamp the plurality of stator laminations, and the tooth pressing plates may be formed with tooth pressing plate rib plate grooves and tooth pressing plate oil holes aligned with the rib plate grooves and the oil holes on the respective stator laminations, respectively.

Preferably, the stator may further include end plates disposed axially outward of the set of tooth pressing plates, and the end plates may be formed with end plate rib plate grooves and tooth pressing plate oil passing holes aligned with the rib plate grooves and the oil passing holes, respectively, on the stator punching sheet.

Preferably, at least two oil grooves spaced apart from each other may be formed on a side edge of each of the punching teeth facing the adjacent punching teeth.

Preferably, the stator may further include a sealing partition plate attached to the stator housing to form a sealed oil inlet chamber and an oil outlet chamber at both axial ends of the stator core, and an oil inlet and an oil outlet are formed on the stator housing, wherein an oil coolant for cooling the stator may enter the oil inlet chamber through the oil inlet, flow through the windings and the inside of the stator core through the first oil passage, the second oil passage, and the third oil passage, and flow into the oil outlet chamber, and flow out through the oil outlet.

According to another aspect of the present disclosure, there is provided an electric machine comprising a stator as described above.

According to another aspect of the present disclosure, a wind power plant is provided, comprising a motor as described above.

Drawings

FIG. 1 shows a schematic cross-sectional view of a portion of a stator according to the present disclosure;

FIG. 2 illustrates a schematic cross-sectional view of a portion of a stator frame according to the present disclosure;

FIG. 3 shows a schematic view of an axial end of a stator according to the present disclosure;

Fig. 4A-4C illustrate schematic views of a stator lamination, a tooth platen, and an end plate of a stator according to the present disclosure; and

Fig. 5 shows a schematic view of an axial end of a stator according to the present disclosure.

Reference numerals illustrate:

1-a stator core; 2-winding; 3-stator stand; 5-coil; 10-a first oil passage; 20-a second oil passage; 30-a third oil passage; 31-an outer cylinder of the machine base; 32-an inner ring of the stand; 33-a driving end flange; 34-a non-driving end flange; 35-an oil outlet; 36-oil inlet; 37-positioning the step; 371-recess; 38-a radially inner peripheral surface; 39-bulge; 41-an oil inlet cavity; 42-an oil outlet cavity; 60-sealing separator; 100-stator punching sheets; 101-punching sheet teeth; 102-punching a sheet groove; 103-punching a yoke; 105-backing strips; 106-slot wedge; 111-an oil passing groove; 113-an oil hole; 123-rib plate grooves; 200-tooth pressing plates; 201-tooth; 203-a yoke; 213-oil holes of the tooth pressing plate; 223-tooth pressing plate rib plate grooves; 300-end plates; 313-an end plate oil through hole; 323-end plate rib plate grooves; 400-rib plates.

Detailed Description

Features and exemplary embodiments of various aspects of the disclosure are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. It will be apparent, however, to one skilled in the art that the present disclosure may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present disclosure by showing examples of the present disclosure. In the drawings and the following description, at least some well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present disclosure; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Fig. 1 shows a schematic cross-sectional view of a portion of a stator according to the present disclosure. Fig. 2 shows a schematic cross-sectional view of a portion of a stator frame according to the present disclosure.

As shown in fig. 1 and 2, the stator of the present disclosure (particularly for a wind power generator, for example, for a medium speed permanent magnet wind power generator) includes a stator core 1, windings 2, and a stator frame 3.

The stator core 1 may be disposed radially inward of the stator housing 3. The stator housing 3 may include a housing outer cylinder 31 and a housing inner ring 32 (shown more clearly in fig. 2) disposed radially inward of the housing outer cylinder 31. The housing inner ring 32 may be welded to the housing outer cylinder 31. The stator core 1 is disposed radially inward of the housing inner ring 32.

The stator housing 3 may include a driving end flange 33 and a non-driving end flange 34, and one end of the driving end flange 33 may be welded to one end of the housing outer cylinder 31. An axial end of the housing inner ring 32 (e.g., an end near the driving end flange 33) may be provided with a positioning step 37 protruding radially inward from a radially inner peripheral surface 38 of the housing inner ring 32 for axially abutting against an axial end of the stator core 1.

The other end of the housing outer cylinder 31 can be welded with a non-driving end flange 34.

In addition, an oil inlet 36 and an oil outlet 35 are formed on both axial sides of the stator frame 3. In addition, the stator further includes a sealing spacer 60 attached to the stator frame 3 to form sealed oil inlet and outlet chambers 41 and 42 at both axial ends of the stator core 1 and enclose the stator core 1 in a sealed space. As shown in fig. 1, at one axial end of the stator core 1, a seal spacer 60 extends from a radially inner side of the stator core 1 toward the driving end flange 33, and extends radially outward toward the housing outer cylinder 31 of the stator housing 3 and is attached to the driving end flange 33 to enclose an oil intake chamber 41 at one axial end of the stator core 1. In addition, at the other axial end of the stator core 1, a seal spacer 60 extends from the radially inner side of the stator core 1 toward the non-driving end flange 34, and extends radially outward toward the housing outer cylinder 31 and is attached to a boss 39 (as indicated in fig. 2) protruding radially inward from the housing outer cylinder 31 to enclose an oil outlet chamber 42 at the other axial end of the stator core 1.

Thereby, the oil coolant for cooling the stator can enter the oil inlet chamber 41 via the oil inlet 36, flow through the inside of the winding 2 and the stator core 1 via an oil passage provided in the stator (as will be described in more detail below), and flow into the oil chamber 42, and then flow out via the oil outlet 35, thereby achieving oil cooling of the stator.

Each of the oil passages formed in the stator of the present disclosure will be described in more detail as follows.

As shown in fig. 1 to 5, the stator core 1 may include a plurality of stator laminations 100 stacked in an axial direction of a stator. The stator core 1 of the present disclosure may be a split stator core 1. The stator core 1 may be assembled from a plurality of stator laminations 100 in a sector shape in the circumferential direction and stacked in the axial direction. As shown in fig. 4A, each stator shim 100 may include shim teeth 101, a shim yoke 103, and shim slots 102 formed between adjacent shim teeth 101. The winding 2 may comprise a coil 5 arranged in the lamination slot 102. As shown in fig. 5, the winding 2 includes a coil 5, the coil 5 is a flat integrated coil, as shown in fig. 5, the coil 5 has a rectangular cross section, two coils 5 can be accommodated in one punching slot 102, a filler strip 105 can be arranged between the two coils 5 for filling and compacting, and a slot wedge 106 can be arranged on the radial inner side of the coil 5 for compacting the coil 5 from the radial inner side.

In addition, the stator may further include a set of tooth plates 200 (shown in fig. 1 and 4B) disposed at both axial ends of the plurality of stator laminations 100 to clamp (e.g., axially clamp) the plurality of stator laminations 100. In addition, the stator may further include end plates 300 (shown in fig. 1 and 4C) respectively disposed axially outward of the set of tooth plates 200. As shown in fig. 3 and fig. 4A to 4C, the tooth platen 200 may include a yoke portion 203 corresponding to the die yoke 103 of the stator die 100 and a tooth portion 201 corresponding to the die teeth 101 of the stator die 100, the yoke portion 203 and the tooth portion 201 of the tooth platen 200 pressing against the die yoke 103 and the die teeth 101 of the stator die 100, respectively. In addition, the end plate 300 is formed in an arc ring shape only, having only an arc ring portion corresponding to the punch yoke 103, to press against the yoke portion 203 of the tooth platen 200.

The stator provided by the present disclosure may form three different oil passages for flowing oil coolant through the stator (stator core 1 and windings 2).

Specifically, in order to directly cool the coil 5 by directly contacting the coil 5 with the oil coolant, oil passing grooves 111 are opened on the side edge of each of the lamination teeth 101 facing the adjacent lamination teeth 101, and the oil passing grooves 111 on the respective stator laminations 100 are aligned in the axial direction of the stator and form first oil passages 10 (shown in fig. 4A and 5) penetrating in the axial direction with the coil 5 provided in the lamination grooves 102. In each of the shim grooves 102, the side edge portions of the shim teeth 101 other than the oil passage grooves 111 are formed in substantially close contact with the coil 5, so that the first oil passage 10 through which the oil-supplying coolant flows is formed between the oil passage grooves 111 and the side edge of the coil 5 only at the oil passage grooves 111.

As shown in fig. 4A, at least two oil grooves 111 spaced apart from each other may be opened on the side edge of each of the die teeth 101 facing the adjacent die teeth 101. Thus, at least four first oil passages 10 may be formed in each of the lamination slots 102 to provide multipoint cooling to both axial sides of the coil 5 and to a plurality of positions in the radial direction.

The oil passage grooves 111 may be formed by die stamping during the manufacture of the stator laminations 100, thereby eliminating the need for additional machining of the coils 5 to achieve oil passages in the grooves. This makes it possible to achieve high productivity and to save the process cost, and also makes it unnecessary to process the coil 5 itself and to break the external insulation of the coil 5, so that various insulation systems for the coil 5 can be applied.

In addition, as shown in fig. 4A, a rib groove 123 is provided on the radially outer peripheral edge of each stator lamination 100 for receiving a rib 400 (shown in fig. 3) extending in the axial direction of the stator. The rib 400 is used to locate and fasten the stator laminations 100 in the axial direction and in the circumferential direction, and the rib 400 may be welded with the stator laminations 100 and the tooth plates 200 and the end plates 300 to be integrated with the stator core 1 before stacking the stator laminations 100 is completed. The rib 400 may have an elongated rod shape, extend in the axial direction, and press the plurality of stator laminations 100 on the radial outer periphery of the stator core 1. When the rib 400 is disposed in the rib groove 123, the outer diameter of the rib 400 may be smaller than the outer diameter of the stator core 1, that is, the rib 400 does not completely fill the rib groove 123 or exceeds the rib groove 123.

When the stator core 1 is mounted on the radially inner side of the stator frame 3, the rib grooves 123 on the respective stator laminations 100 may be aligned in the axial direction of the stator and form the second oil passage 20 penetrating in the axial direction of the stator with the radially inner peripheral surface 38 of the stator frame 3. For example, after the rib 400 is disposed in the rib groove 123, the rib 400 does not fill the rib groove 123, and there may be a space between the rib 400 and the rib groove 123 and/or between the rib 400 and the radially inner circumferential surface 38 of the stator frame 3, whereby the oil may flow therethrough, thereby forming the second oil passage 20.

Therefore, the oil passage can be formed by utilizing the arrangement position of the rib plate 400, so that an additional axial oil passage can be obtained without a special process, and the manufacturing process is saved.

In addition, as shown in fig. 5, a recess 371, which is at least partially aligned with the rib grooves 123 of the respective stator laminations 100, may be provided on the positioning step 37 formed on the housing inner ring 32 of the stator housing 3. Thus, after entering the oil intake chamber 41, the oil coolant flows through the stator core 1 via the recess 371 and via the rib grooves 123 of each stator plate 100.

In addition, in this case, the entire outer cylindrical surface of the stator core 1 except for the rib grooves 123 may be in contact with the radially inner peripheral surface 38 of the housing inner ring 32. Therefore, compared with the traditional structure that oil is pumped from the axial middle part of the stator core and an oil cavity is formed at the radial outer side of the stator core, the stator core 1 and the stator base 3 are large in installation contact area, firm in assembly and strong in torque resistance, and therefore the structure can be suitable for application scenes with large loads.

Further, as shown in fig. 4A, the sheet yoke 103 of each stator sheet 100 may be provided therein with oil holes 113, and the oil holes 113 on the respective stator sheets 100 may be aligned in the axial direction of the stator and form the third oil passage 30 penetrating in the axial direction of the stator. The oil passing hole 113 may be formed by die stamping during the manufacture of the stator plate 100. As shown in fig. 4A, a plurality of oil holes 113 may be formed in each of the fan-shaped stator laminations 100, whereby a plurality of spaced apart third oil passages 30 may be formed along the entire circumference of the lamination yoke 103 of the entire stator core 1, so that the stator core 1 may be sufficiently and uniformly oil-cooled.

In addition, as shown in fig. 4B and 4C, the tooth platen 200 may be formed with tooth platen rib grooves 223 and tooth platen oil holes 213 aligned with the rib grooves 123 and the oil holes 113, respectively, on the respective stator laminations 100. In addition, the end plate 300 may be formed with end plate rib grooves 323 and tooth plate oil passing holes 313 aligned with the rib grooves 123 and the oil passing holes 113 of the respective stator laminations 100, respectively. Thus, the oil intake chamber 41 and the oil discharge chamber 42 can communicate with the second oil passage 20 and the third oil passage 30 through the tooth-pressing plate rib grooves 223 and the tooth-pressing plate oil passing holes 213 on the tooth-pressing plate 200, and the end plate rib grooves 323 and the tooth-pressing plate oil passing holes 313 on the end plate 300.

Thus, the oil coolant for cooling the stator can enter the oil intake chamber 41 through the oil inlet 36, flow through the windings 2 (particularly, the circumferential both sides of each coil 5) and the inside (yoke and radial outer periphery) of the stator core 1 through the first oil passage 10, the second oil passage 20, and the third oil passage 30, flow into the oil chamber 42, and then flow out through the oil outlet 35.

Therefore, through the three oil ducts, the oil coolant (or cooling liquid) directly contacts with the heating components such as the stator core 1, the coil 5 and the like in the flowing process from the oil inlet 36 to the oil outlet 35 along each oil duct, the cooling efficiency is high, the contact area is sufficient, the heat exchange is sufficient, the whole heat dissipation capacity of the motor is strong, the temperature rise of the motor is small, the environmental adaptability is stronger, the use of effective materials can be reduced, and the manufacturing cost is reduced.

In addition, in the stator of this example, the stator laminations 100 are laminated continuously in the axial direction, the stator laminations 100 of the upper and lower layers are laminated tightly, and there is no need to reserve a neutral portion for oil passing as in the existing axial middle oil pumping structure, so the length of the iron core in this disclosure is shorter than that of the middle oil pumping scheme, the material usage in the axial direction is compact, the effective material utilization rate is high, and the cost is saved.

In addition, each axial oil duct can be obtained without special process, holes or grooves are formed in the stator punching sheet or rib plate grooves are utilized, the stator punching sheet can be directly punched through a die, the process cost is not increased, and the production efficiency is high. In addition, the oil duct for cooling the coil is formed without secondary processing on the external insulation of the coil, so that the process cost can be saved, and the method is suitable for various insulation systems.

In addition, compared with an axial middle oil pumping scheme, the stator core is in integral contact with the stator base, compared with the middle oil pumping scheme, the stator core is larger in contact area, more firm in assembly under the same interference magnitude, strong in torque resistance and applicable to application scenes with larger load.

In addition, the present disclosure also provides an electric machine that may include a stator as described above.

In addition, the present disclosure also provides a wind power generator set, which may include the motor as described above.

While certain embodiments have been shown and described, it would be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles and spirit of the application, the scope of which is defined in the claims and their equivalents.

Claims (11)

1. A stator, comprising:

A stator core (1) comprising a plurality of stator laminations (100) stacked in an axial direction of the stator, each of the stator laminations (100) comprising lamination teeth (101), a lamination yoke (103), and lamination slots (102) formed between adjacent lamination teeth (101),

A winding (2) comprising a coil (5) arranged in the lamination slot (102);

The stator punching device is characterized in that an oil through groove (111) is formed in the side edge of each punching tooth (101) facing the adjacent punching tooth (101), and the oil through groove (111) on each stator punching (100) is aligned in the axial direction and forms a first oil passage (10) communicated in the axial direction with a coil (5) arranged in the punching groove (102).

2. The stator as claimed in claim 1, wherein,

The stator also comprises a stator base (3), the stator core (1) is arranged on the radial inner side of the stator base (3),

Wherein a rib groove (123) is provided on a radially outer peripheral edge of each stator lamination (100) for receiving a rib (400) extending in the axial direction, wherein the rib groove (123) on each stator lamination (100) is aligned in the axial direction and forms a second oil passage (20) penetrating in the axial direction with a radially inner peripheral surface of the stator housing (3).

3. The stator as claimed in claim 2, wherein,

An oil through hole (113) is formed in a sheet yoke (103) of each stator sheet (100), and the oil through holes (113) on each stator sheet (100) are aligned in the axial direction and form a third oil passage (30) penetrating in the axial direction.

4. The stator according to claim 2, characterized in that the stator housing (3) comprises a housing outer cylinder (31) and a housing inner ring (32) arranged radially inside the housing outer cylinder (31), the entire outer cylindrical surface of the stator core (1) being in contact with a radially inner circumferential surface (38) of the housing inner ring (32).

5. The stator according to claim 4, characterized in that an axial one end of the housing inner ring (32) is provided with a positioning step (37) protruding radially inward from a radially inner peripheral surface (38) of the housing inner ring (32) to axially abut against an axial end portion of the stator core (1),

Wherein the positioning step (37) is provided with a recess (371) at least partially aligned with the gusset groove (123) of each stator lamination (100).

6. A stator according to claim 3, further comprising a set of tooth-pressing plates (200) provided at both axial ends of a plurality of the stator laminations (100) to clamp the plurality of stator laminations (100), the tooth-pressing plates (200) being formed with tooth-pressing plate rib grooves (223) and tooth-pressing plate oil holes (213) aligned with the rib grooves (123) and the oil holes (113) on the respective stator laminations (100), respectively.

7. The stator of claim 6, further comprising end plates (300) disposed axially outward of the set of tooth plates (200), respectively, the end plates (300) having end plate gusset grooves (323) and tooth plate oil passage holes (313) formed thereon that are aligned with the gusset grooves (123) and oil passage holes (113), respectively, on each of the stator laminations (100).

8. The stator according to claim 1, characterized in that at least two oil grooves (111) spaced apart from each other are provided on the side edge of each of the punching teeth (101) facing an adjacent punching tooth (101).

9. A stator according to claim 3, characterized in that the stator further comprises a sealing partition plate (60) attached to the stator frame (3) to form sealed oil inlet cavities (41) and oil outlet cavities (42) at both axial ends of the stator core (1), and that the stator frame (3) is formed with an oil inlet (36) and an oil outlet (35),

The oil coolant for cooling the stator enters the oil inlet cavity (41) through the oil inlet (36), flows through the windings (2) and the inside of the stator core (1) through the first oil passage (10), the second oil passage (20) and the third oil passage (30), flows into the oil outlet cavity (42), and flows out through the oil outlet (35).

10. An electric machine comprising a stator according to any one of claims 1 to 9.

11. A wind power generator set comprising an electric machine according to claim 10.