CN113178966B - Motor ventilation groove structure, stator and motor - Google Patents
Motor ventilation groove structure, stator and motor Download PDFInfo
- Publication number
- CN113178966B CN113178966B CN202110404910.6A CN202110404910A CN113178966B CN 113178966 B CN113178966 B CN 113178966B CN 202110404910 A CN202110404910 A CN 202110404910A CN 113178966 B CN113178966 B CN 113178966B
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- stator
- silicon steel
- motor
- radial
- steel sheets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The embodiment of the invention provides a motor ventilation groove structure, a stator and a motor. The motor comprises a stator, wherein the stator comprises a stator iron core and a winding fixed on the stator iron core. The motor ventilation slot structure comprises a plurality of ventilation slots arranged along the radial direction of a stator, wherein each ventilation slot comprises a radial through slot arranged in a stator core and a plurality of grooves arranged along the radial direction of the stator at the positions, close to windings, of the two opposite sides of the radial through slot. The motor ventilation slot structure, the stator and the motor provided by the embodiment of the invention can improve the utilization efficiency of cooling air and effectively reduce the temperature of the winding and the stator core.
Description
Technical Field
The embodiment of the invention relates to the technical field of motors, in particular to a motor ventilation groove structure, a stator and a motor.
Background
The heating phenomenon of the motor can accelerate the insulation aging of the motor and reduce the service life of the motor, and the local large temperature gradient of the motor can also generate large local thermal stress, possibly causing the damage of the motor structure. Therefore, the improvement of the cooling technology and the improvement of the cooling capacity play decisive roles in prolonging the service life of the motor and ensuring the working reliability of the motor.
At present, a radial ventilation mode of a motor is an important cooling mode, and ventilation slots which are positioned inside a stator core and extend along the radial direction are formed by discontinuously stacking silicon steel sheets and supported by virtue of a ventilation slot supporting structure. The vent slot support structure generally includes a vent slot plate and a vent slot support rib, which is typically secured to the vent slot plate by welding. At present, the ventilation slot structure is mostly a flat channel with a rectangular cross section, and although the supporting ribs of the ventilation slot plate in the ventilation slot structure can play a certain turbulence effect, the effect is limited. One common internal air cooling path for a generator is: air flows into the air gap through the end windings and then through the flat radial ventilation slots to effect cooling of the windings and stator core.
In the existing cooling technology, the design of the radial ventilation groove is simple, even if a transverse turbulent flow structure exists, the development of a longitudinal temperature boundary layer cannot be blocked, and the heat exchange effect is gradually reduced along with the development of the temperature boundary layer. In addition, the area of the air contacted by the winding is not enough, and the air contacted with the winding is mostly heated air, so that the cold air in the central area can not contact the winding, and the cooling effect of the winding is further limited.
Disclosure of Invention
The embodiment of the invention aims to provide a motor ventilation slot structure, a stator and a motor, which can improve the utilization efficiency of cooling air and effectively reduce the temperature of a winding and a stator iron core.
One aspect of an embodiment of the present invention provides a motor ventilation groove structure. The motor comprises a stator, wherein the stator comprises a stator iron core and a winding fixed on the stator iron core. The motor ventilation slot structure comprises a plurality of ventilation slots arranged along the radial direction of the stator, and each ventilation slot comprises a radial through slot arranged in the stator core and a plurality of grooves arranged along the radial direction of the stator at the positions, close to the windings, of the two opposite sides of the radial through slot.
Another aspect of an embodiment of the present invention also provides a stator including a stator core and a winding fixed to the stator core. The stator further comprises a motor ventilation slot structure as described above.
Yet another aspect of an embodiment of the present invention also provides a motor. The electrical machine comprises a stator as described above.
The motor ventilation slot structure, the stator and the motor of the embodiment of the invention can form backflow by the structure that the positions of the two opposite sides of the radial straight-through slot, which are close to the winding, are gradually provided with the plurality of grooves along the radial direction of the stator, mix cold and hot fluid, reduce the temperature of air contacting with the winding, and increase the contact area of the winding and the air, thereby improving the utilization efficiency of cooling air, improving the heat dissipation performance of heating parts in the motor, and effectively reducing the temperature of the winding and a stator core.
Drawings
FIG. 1 is a partial isometric view of a stator of one embodiment of the present invention;
FIG. 2 is a top view of the stator shown in FIG. 1;
FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
fig. 5 is a partial schematic view of a first silicon steel sheet according to an embodiment of the present invention;
fig. 6 is a partial schematic view of a second silicon steel sheet according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The embodiment of the invention provides a stator 1. Fig. 1 discloses a partial isometric view of a stator 1 of one embodiment of the invention. As shown in fig. 1, the stator 1 includes a stator core 10 and a winding 12 fixed to the stator core 10. The stator 1 of one embodiment of the present invention also includes a motor ventilation slot structure 20 that may be used to enhance motor air cooling. The motor ventilation groove structure 20 of one embodiment of the present invention includes a plurality of ventilation grooves provided in the radial direction D1 of the stator 1. The ventilation slots include a radial through slot 21 provided inside the stator core 10, and a plurality of grooves 22 provided in the radial direction D1 of the stator 1 at portions close to the windings 12 on opposite sides of the radial through slot 21.
The grooves 22 of embodiments of the present invention may include, for example, but are not limited to, rectangular shapes. In other embodiments, the grooves 22 of the present invention may also be circular, triangular, etc. to generate reflow and facilitate machining.
The motor ventilation slot structure 20 of the embodiment of the invention can form backflow, mix cold and hot fluid, reduce the air temperature in contact with the winding 12, and increase the contact area between the winding 12 and the air by the structure that the plurality of grooves 22 are gradually arranged on the parts, close to the winding 12, on the two opposite sides of the radial straight-through slot 21 along the radial direction D1 of the stator 1, so that the utilization efficiency of cooling air can be improved, and the temperatures of the winding 12 and the stator core 10 can be effectively reduced.
Fig. 2 disclosesbase:Sub>A top view of the stator 1 shown in fig. 1, fig. 3 isbase:Sub>A sectional view taken along the linebase:Sub>A-base:Sub>A in fig. 2, and fig. 4 isbase:Sub>A sectional view taken along the line B-B in fig. 2. As shown in fig. 2 and 4 in combination with fig. 1, in some embodiments, the plurality of flutes 22 may be staggered relative to each other on opposite sides of the radial through slots 21.
According to the motor ventilation groove structure 20, the grooves 22 on the two opposite sides of the radial straight-through groove 21 are distributed in a staggered mode, so that the flow velocity of air in the grooves 22 can be guaranteed, and a low-flow-velocity area is avoided.
As shown in fig. 1, the stator core 10 comprises a plurality of stator core lamination packs 11. Stator core lamination stack 11 is formed by stacking a plurality of silicon steel sheets 110 (shown in fig. 5 and 6) in an axial direction D2 of stator 1. The ventilation slots are formed by two adjacent sets of stator core lamination packs 11 arranged at intervals.
In some embodiments of the present invention, the silicon steel sheets 110 may include a first silicon steel sheet 111 and a second silicon steel sheet 112. Fig. 5 discloses a partial schematic view of the first silicon steel sheet 111 according to an embodiment of the present invention, and fig. 6 discloses a partial schematic view of the second silicon steel sheet 112 according to an embodiment of the present invention. The stator core lamination stack 11 includes a plurality of first silicon steel sheets 111 and a plurality of second silicon steel sheets 112, the plurality of first silicon steel sheets 111 and the plurality of second silicon steel sheets 112 are stacked together in sequence along an axial direction D2 of the stator 1 to form a stator core lamination stack 11, wherein the plurality of second silicon steel sheets 112 are close to one side of the radial through groove 21. As shown in fig. 5 and 6, in order to form the grooves 22 on the two opposite sides of the radial through groove 21 according to the embodiment of the present invention, a plurality of notches 1120 may be formed on the plurality of second silicon steel sheets 112 close to the two opposite sides of the radial through groove 21, close to the side edge of the winding 12, in a gradual manner, while the notches need not be formed on the first silicon steel sheet 111. Thus, after the plurality of first silicon steel sheets 111 and the plurality of second silicon steel sheets 112 are sequentially stacked together in the axial direction D2 of the stator 1, the notches 1120 of the plurality of second silicon steel sheets 112 stacked together may form the groove 22 according to the embodiment of the present invention.
Since the notches 1120 of the second silicon steel sheets 112 adjacent to the opposite sides of the radial through-groove 21 are staggered from each other, as shown in fig. 4, after the plurality of second silicon steel sheets 112 are stacked on the opposite sides of the radial through-groove 21, the recesses 22 formed by the notches 1120 of the plurality of second silicon steel sheets 112 stacked on the opposite sides of the radial through-groove 21 are also staggered from each other.
Moreover, since the notches 1120 are gradually punched on the side edges of the second silicon steel sheets 112, the plurality of second silicon steel sheets 112 stacked together form a plurality of serrations 23 on opposite sides of the radial through-groove 21, respectively. As shown in fig. 4, in some embodiments, the plurality of serrations 23 on one side of the radial through groove 21 correspond to the plurality of grooves 22 on the other side of the radial through groove 21, respectively, thereby forming the vent groove structure shown in fig. 4 in a zigzag distribution.
For example, in practice, the width of the sawteeth 23 of each of the 5 layers of second silicon steel sheets 112 on both sides of the radial through groove 21 can be kept equal, but the sawteeth 23 are staggered by the width of one sawtooth 23, and then the ventilation groove structure with zigzag distribution as shown in fig. 4 according to the embodiment of the present invention can be formed by adopting the conventional stacking manner, so that the heat exchange can be enhanced without excessively increasing the pressure loss.
In one embodiment, in the circumferential direction D3 of the stator 1, the width of the groove 22, i.e., the width of the sawtooth 23 formed after the notch 1120 is punched on the second silicon steel sheet 112, is not more than one-fourth of the entire width of the ventilation groove. For example, the width of the groove 22 may take 3mm.
In another embodiment, the depth of the groove 22 in the axial direction D2 of the stator 1, i.e., the total thickness of the second silicon steel sheet 112 with the notches 1120, does not exceed the equivalent circular diameter of the surface shape of the groove 22, so that the additional pressure loss caused by the structure of the groove 22 can be controlled. For example, the depth of the groove 22 may be 3mm.
As shown in fig. 5 and 6, each of the silicon steel sheets 110 of the first and second silicon steel sheets 111 and 112 includes a plurality of teeth 1101 arranged at intervals, a groove portion 1102 formed between each adjacent two of the teeth 1101, and a yoke portion 1103 connecting the plurality of teeth 1101. Wherein, the winding 12 is assembled in the groove portions 1102 of the plurality of first silicon steel sheets 111 and second silicon steel sheets 112 stacked together. As shown in fig. 6, a plurality of notches 1120 punched on the second silicon steel sheet 112 may be formed on the teeth 1101 of the second silicon steel sheet 112. In one embodiment, the notches 1120 may be symmetrically formed at opposite sides of the teeth 1101 of the second silicon steel sheet 112, that is, two rows of notches 1120 are formed at opposite sides of the teeth 1101 of the second silicon steel sheet 112. Therefore, after the plurality of second silicon steel sheets 112 are stacked together, as shown in fig. 3, the grooves 22 formed at opposite sides of the winding 12 are also symmetrically arranged accordingly.
The above description is only some exemplary embodiments of the structure of the groove 22 according to the embodiment of the present invention, however, the structure of the groove 22 according to the embodiment of the present invention is not limited thereto. In other embodiments, the grooves 22 of the present invention may be distributed in other ways.
The motor ventilating slot structure 20 and the stator 1 with the motor ventilating slot structure 20 according to the embodiment of the present invention only need to slightly change the structure of the silicon steel sheets 110, notches 1120 are gradually punched on the plurality of second silicon steel sheets 112 close to the two opposite sides of the radial straight-through slot 21, and the notches 1120 formed after the plurality of second silicon steel sheets 112 are stacked together can form the groove 22, so that the heat exchange area of the heat generating components of the motor can be increased, the utilization efficiency of air is improved, and the heat dissipation performance of the heat generating components in the motor is improved. The motor ventilation groove structure 20 and the stator 1 having the motor ventilation groove structure 20 according to the embodiment of the present invention may cause a slight increase in pressure loss, but can effectively reduce the temperature of the winding 12 and the stator core 10.
According to the motor ventilation groove structure 20 and the stator 1 with the motor ventilation groove structure 20, disclosed by the embodiment of the invention, through the structure that the grooves 22 are arranged on the second silicon steel sheets 112 on the two sides of the radial straight-through groove 21, the backflow area can be generated in the grooves 22, the further development of a temperature boundary layer is blocked, the fluid at the flow core area and the flow boundary layer is mixed, and the temperature of the fluid in direct contact with a heat generating component is reduced.
According to the motor ventilation slot structure 20 and the stator 1 with the motor ventilation slot structure 20, the notches 1120 are formed in the positions, close to the windings 12, of the second silicon steel sheets 112 so as to form the grooves 22 after stacking, so that the heat exchange area of the windings 12 is increased, and heat transfer is performed more effectively.
In addition, the motor ventilation slot structure 20 and the stator 1 with the motor ventilation slot structure 20 of the embodiment of the invention form staggered saw-tooth ventilation slot structures by forming staggered notches 1120 on the second silicon steel sheet 112, wherein respective parts of two sides of the radial straight-through slot 21 are close to the radial straight-through slot 21, thereby avoiding local low flow velocity areas possibly generated by a simple turbulent flow structure and ensuring the uniformity of flow velocity at each position in the slot.
The motor ventilation groove structure 20 and the stator 1 with the motor ventilation groove structure 20 according to the embodiment of the invention can form the groove 22 by stacking by directly processing the notch 1120 on the second silicon steel sheet 112, so that other redundant structures are not needed, the purpose of enhancing heat dissipation can be achieved by the structural change of the second silicon steel sheet 112, and the motor ventilation groove structure 20 and the stator 1 with the motor ventilation groove structure 20 have the advantages of simple structure and low cost.
The embodiment of the invention also provides a motor. The motor comprises a stator 1 as described in the various embodiments above.
The motor according to the embodiment of the present invention has similar beneficial technical effects as the stator 1 described in the above embodiments, and therefore, the details are not repeated herein.
The motor ventilation groove structure, the stator and the motor provided by the embodiment of the invention are described in detail above. The motor ventilation slot structure, the stator and the motor according to the embodiments of the present invention are described herein by using specific examples, and the above description of the embodiments is only used to help understand the core idea of the present invention, and is not intended to limit the present invention. It should be noted that, for those skilled in the art, various improvements and modifications can be made without departing from the spirit and principle of the present invention, and these improvements and modifications should fall within the scope of the appended claims.
Claims (9)
1. The utility model provides a motor ventilation groove structure, the motor includes the stator, the stator includes stator core and is fixed in the winding on the stator core, its characterized in that: the motor ventilation groove structure comprises a plurality of ventilation grooves arranged in the radial direction of the stator, the ventilation grooves comprise radial through grooves arranged in the stator core and a plurality of grooves formed in the radial direction of the stator, the radial through grooves are formed in the positions, close to the windings, of the radial sides of the radial through grooves, the stator core comprises a plurality of stator core lamination groups, the stator core lamination groups are formed by stacking a plurality of silicon steel sheets in the axial direction of the stator, the ventilation grooves are formed by two adjacent groups of stator core lamination groups at intervals, the silicon steel sheets comprise first silicon steel sheets and second silicon steel sheets, the stator core lamination groups comprise a plurality of first silicon steel sheets and a plurality of second silicon steel sheets, the second silicon steel sheets are close to one sides of the radial through grooves, the second silicon steel sheets are close to the sides of the windings, a plurality of notches are gradually punched, and the grooves are formed by a plurality of notches of the second silicon steel sheets which are overlapped together.
2. The motor ventilation slot structure of claim 1, wherein: the grooves are arranged on two opposite sides of the radial straight-through groove in a staggered mode.
3. The motor ventilation slot structure of claim 1, wherein: the silicon steel sheets comprise a plurality of tooth parts arranged at intervals, groove parts formed between every two adjacent tooth parts and yoke parts connected with the tooth parts, and the notches are formed in the tooth parts of the second silicon steel sheets.
4. The motor ventilation slot structure of claim 3, wherein: the notches are symmetrically formed on two opposite sides of the tooth part of the second silicon steel sheet.
5. The motor ventilation slot structure of claim 1, wherein: the second silicon steel sheets which are overlapped together form a plurality of sawteeth on two opposite sides of the radial through groove respectively, and the sawteeth on one side of the radial through groove correspond to the grooves on the other side of the radial through groove respectively.
6. The motor ventilation slot structure of any one of claims 1 to 5, wherein: in the circumferential direction of the stator, the width of the groove is not more than one fourth of the whole width of the ventilation groove.
7. The motor ventilation slot structure of any one of claims 1 to 5, wherein: the depth of the groove in the axial direction of the stator does not exceed the equivalent circular diameter of the groove surface shape.
8. A stator, it includes stator core and fixes to winding on the said stator core, characterized by that: the stator further comprising a motor ventilation slot arrangement as claimed in any one of claims 1 to 7.
9. An electric machine characterized by: the electrical machine comprising a stator as claimed in claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110404910.6A CN113178966B (en) | 2021-04-15 | 2021-04-15 | Motor ventilation groove structure, stator and motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404910.6A CN113178966B (en) | 2021-04-15 | 2021-04-15 | Motor ventilation groove structure, stator and motor |
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| Publication Number | Publication Date |
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| CN113178966A CN113178966A (en) | 2021-07-27 |
| CN113178966B true CN113178966B (en) | 2023-03-24 |
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| CN202110404910.6A Active CN113178966B (en) | 2021-04-15 | 2021-04-15 | Motor ventilation groove structure, stator and motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114362393A (en) * | 2021-12-03 | 2022-04-15 | 中车永济电机有限公司 | Stator core with axial ventilation holes provided with spacing torsion bands |
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