CN114552900B - Optimization method of stator punching sheet of irregular tooth width groove special-shaped groove type motor and iron core - Google Patents
Optimization method of stator punching sheet of irregular tooth width groove special-shaped groove type motor and iron core Download PDFInfo
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- CN114552900B CN114552900B CN202210102373.4A CN202210102373A CN114552900B CN 114552900 B CN114552900 B CN 114552900B CN 202210102373 A CN202210102373 A CN 202210102373A CN 114552900 B CN114552900 B CN 114552900B
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- 238000004080 punching Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005457 optimization Methods 0.000 title claims abstract description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 230000001788 irregular Effects 0.000 title claims description 15
- 238000004088 simulation Methods 0.000 claims abstract description 21
- 230000002159 abnormal effect Effects 0.000 claims description 38
- 238000012360 testing method Methods 0.000 claims description 27
- 238000003475 lamination Methods 0.000 claims description 12
- 230000004907 flux Effects 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 3
- 230000006872 improvement Effects 0.000 abstract description 6
- 229910000976 Electrical steel Inorganic materials 0.000 abstract description 5
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 235000014443 Pyrus communis Nutrition 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/0006—Disassembling, repairing or modifying dynamo-electric machines
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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
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/022—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with salient poles or claw-shaped poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The utility model discloses an optimization method of a stator punching sheet of a special-shaped slot type motor with unequal tooth widths and an iron core, wherein the optimization method firstly designs the basic shape of the stator punching sheet through the product cost, and then designs an initial slot type according to the power range and the efficiency requirement of the motor; then performing magnetic field simulation on the stator punching sheet through magnetic circuit simulation software, acquiring various magnetic circuit data, and adjusting stator slot types and tooth widths of different parts of the stator punching sheet according to the acquired magnetic circuit data; the optimization method can further optimize and adjust the actual situation of non-uniform magnetic circuits of all parts of the stator punching sheet, so that the magnetic circuits of the whole stator punching sheet are uniformly distributed, the utilization rate of the silicon steel sheet material of the punching sheet is improved, and the improvement of the motor efficiency and the cost control are facilitated; under the condition of the same number of turns and current, the iron loss of the motor of the electronic punching sheet designed by the method is reduced, and the output torque is improved.
Description
Technical Field
The utility model relates to the technical field of stator punching sheets of compressors, in particular to an optimization method and an iron core of a stator punching sheet of a special-shaped groove type motor with unequal tooth widths.
Background
Single-phase asynchronous motors used in the refrigerator compressor industry, which are typically of the following slot type,
1. the number of stator slots is typically 24 slots (there is also a 30 slot design); 2. for example, as shown in fig. 1 and 2 of the drawings, the stator groove type is usually a round bottom groove or a pear type groove, and the size grooves are distributed (24 grooves are designed in the same groove type); 3. the stator tooth widths are all equal, whether they are round bottom slots or pear shaped slots. The magnetic circuit at each part of the stator punching sheet with the structure has the uneven phenomenon, so that the load of the whole magnetic circuit of the punching sheet is unevenly distributed, the utilization rate of the silicon steel sheet material of the punching sheet is reduced, and the improvement of the motor efficiency and the cost control are not facilitated.
The Chinese patent (publication No. CN 201290031Y) discloses a motor stator core punching structure in 2009, which comprises a yoke part, a tooth part, a wire embedding groove and a central hole, wherein the wire embedding groove is communicated with the central hole, the wire embedding groove is provided with two or more different grooves, and each groove of the wire embedding groove adopts the measures of unequal tooth widths, unequal groove depths and unequal graduation, so that the graduation rule change is symmetrically distributed along the central axis of each pole phase group, and the change rule among each pole phase group is the same. Although the patent proposes optimizing stator laminations in a manner of unequal tooth widths and unequal slot depths, the optimization is not suitable for the performance requirements of the existing refrigeration compressors, and does not consider how to optimize the overall performance of the motor without increasing the cost.
Disclosure of Invention
The utility model aims at solving the problems existing in the prior art and provides an optimization method of a stator punching sheet of a special-shaped groove type motor with unequal tooth widths and an iron core.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the optimization method of the stator punching sheet of the abnormal tooth width groove special-shaped groove type motor comprises the steps of firstly designing the basic shape of the stator punching sheet through the product cost, and then designing an initial groove type according to the power range and the efficiency requirement of the motor; then performing magnetic field simulation on the initial slot type of the stator punching sheet through magnetic circuit simulation software, acquiring various magnetic circuit data, and adjusting stator slot types and tooth widths of different parts of the stator punching sheet according to the acquired magnetic circuit data;
the plurality of magnetic circuit data comprise magnetic flux intensity and magnetic density data of the stator tooth parts and the stator yoke parts, and the outer contour shape of the stator punching sheet is adjusted according to uneven magnetic flux intensity distribution of the stator tooth parts and the stator yoke parts and uneven intervals between stator slots and the outer contour of the stator punching sheet; aiming at the magnetic densities of the stator tooth parts at different positions and the magnetic densities of the stator yoke parts, the stator groove type is adjusted to be a special groove, and the tooth widths are adjusted to be unequal tooth widths.
The optimization method can further optimize and adjust the actual situation of non-uniform magnetic circuits at all parts of the stator punching sheet, so that the whole magnetic circuits of the stator punching sheet are uniformly distributed, the utilization rate of the silicon steel sheet material of the punching sheet is improved, and the improvement of the motor efficiency and the cost control are facilitated.
By adopting the optimization method, the magnetic field strength of the main magnetic circuit is greatly reduced from the view of the magnetic field cloud chart and test data, so that the motor torque is improved, the motor efficiency is improved, and the motor loss is reduced. Under the condition of the same number of turns and current, the iron loss of the motor of the electronic punching sheet designed by the method is reduced, and the output torque is improved.
And designing a conventional groove type according to the power range and the efficiency requirement, and adjusting the conventional groove type to be a special-shaped groove after the conventional groove type is designed, wherein the area of each groove is kept unchanged.
The optimization method considers the cost of the whole machine, simultaneously considers the performance of the whole machine, reduces the cost of the product, improves the performance of the product, and does not change the original scheme (basic shape) greatly in a large area, thereby having better productivity and practicability. Under the condition that the outer contour of the stator punching sheet is unchanged and the punching sheet cost is unchanged or reduced, the efficiency and the output torque of the motor are improved, and the cost performance of the product is greatly improved.
Further, the tooth part of the stator at least selects more than six test points of different groove types for testing, and at least two test points are selected on each tooth type; and the stator yoke part is at least tested by selecting more than five pairs of test points on different slot types, wherein the pairs of test points are symmetrical.
The arrangement of a plurality of test points on the plurality of groove patterns fully considers the positions of the tooth parts and the yoke parts, can more accurately reflect the data obtained by simulation and is more similar to the actual magnetic field receiving condition of the stator punching sheet; and the magnetic field distribution conditions under different tooth widths at symmetrical positions can be obviously seen by selecting test points in pairs, so that a basis is provided for the selection of the tooth widths.
Further, in the process of performing magnetic field simulation, the magnetic field simulation is performed again after the slot type and the tooth width are adjusted once, the simulation result is compared with the initial scheme and the previous scheme, and the proper result is gradually optimized and selected as the basis for mass production of stator products. Through multiple times of comparison and testing, the optimal scheme can be determined before the production of the product, the production cost can be reduced, and the waste of test samples can be reduced.
Further, the size of the inner hole of the stator punching sheet is in the range of 44-65 mm, the tooth width is 2-4.5 mm, the basic size of the stator punching sheet in the current refrigerator compressor is further reduced due to the intelligent and miniaturized trend of household appliances, the size of the motor and the stator punching sheet is gradually miniaturized, and the product volume is also required by the market while the cooling requirement is met.
Further, the stator punching sheet designed by the optimization method of the stator punching sheet of the irregular tooth width groove type motor is of a three screw hole 24 groove structure, six irregular groove types are provided, each six irregular groove types comprises a1 st irregular groove, a 2 nd irregular groove, a 3 rd irregular groove, a 4 th irregular groove, a 5 th irregular groove and a 6 th irregular groove, the 24 grooves are symmetrically arranged up and down in the center of an inner hole of the stator punching sheet, and the upper semicircle is sequentially arranged from left to right according to the mode of the irregular groove 1-2-3-4-5-6-6-5-4-3-3-1.
Further, if the tooth width between the adjacent pair of the 1 st abnormal-shaped grooves is a, and the tooth width between the adjacent pair of the 6 th abnormal-shaped grooves is b, the tooth widths between the 1 st abnormal-shaped grooves and the adjacent 3 rd abnormal-shaped grooves, and between the 1 st abnormal-shaped grooves and the adjacent 2 nd abnormal-shaped grooves are (a+b)/2.
Further, a has a value of 2.4mm and b has a value of 2.67mm.
Further, the three screw holes are arranged on the stator punching sheet according to a delta shape, wherein one pair of the three screw holes are symmetrically arranged on the left side of the stator punching sheet, and the other pair of the three screw holes are arranged on the right middle line of the stator punching sheet.
Further, the fillets at two sides of the groove bottoms of the 1 st abnormal shape groove, the 4 th abnormal shape groove and the 5 th abnormal shape groove are R1.5mm and R2mm respectively, and the fillets at two sides of the groove bottoms of the 2 nd abnormal shape groove, the 3 rd abnormal shape groove and the 6 th abnormal shape groove are R2mm respectively.
The stator punching sheet designed by the method has the advantages that the angle of each groove type is changed as the groove type structure is optimized, and the angle of each groove type is obviously different from that of the initial groove type.
The angular range of the bottom outer contour of the 12 special-shaped grooves from the left side to the right side of the upper half part of the stator punching sheet is as follows: the included angles of the 1 st abnormal-shaped groove on the left side and the right side and the vertical line are 0 degrees, the included angle of the 2 nd abnormal-shaped groove on the left side and the vertical line are 7.5-10 degrees, the included angle of the 3 rd abnormal-shaped groove on the left side and the vertical line are 37.5-42.5 degrees, the included angles of the 4 th abnormal-shaped groove on the left side and the right side and the horizontal line are 20-21.45 degrees, the included angles of the 5 th abnormal-shaped groove on the left side and the right side and the horizontal line are 0 degrees, the included angles of the two 6 th abnormal-shaped grooves in the middle and the horizontal line are 7.5 degrees, and the included angles of the two continuous 3 rd abnormal-shaped grooves on the right side and the right inclined line are 5-12.5 degrees and 2.5-5 degrees respectively.
Further, the iron core is manufactured by a plurality of abnormal tooth width groove special-shaped groove type motor stator punching sheets.
Compared with the prior art, the utility model has the beneficial effects that: 1. the optimization method can further optimize and adjust the actual situation of non-uniform magnetic circuits of all parts of the stator punching sheet, so that the magnetic circuits of the whole stator punching sheet are uniformly distributed, the utilization rate of the silicon steel sheet material of the punching sheet is improved, and the improvement of the motor efficiency and the cost control are facilitated; 2. by adopting the optimization method, the magnetic field strength of the main magnetic circuit is greatly reduced from the view of the magnetic field cloud chart and test data, so that the motor torque is improved, the motor efficiency is improved, and the motor loss is reduced. Under the condition of the same number of turns and current, the iron loss of the motor of the electronic punching sheet designed by the method is reduced, and the output torque is improved; 3. the optimization method considers the cost of the whole machine, simultaneously considers the performance of the whole machine, reduces the cost of the product, and simultaneously improves the performance of the product, and the original scheme is not changed in a large area and greatly by the optimization, so that the method has good productivity and practicability.
Drawings
FIG. 1 is a prior art round bottom shaped stator slot configuration;
FIG. 2 is a prior art pear-shaped stator groove structure;
FIG. 3 is a schematic diagram showing the overall structure of a stator punching sheet of an unequal tooth width special-shaped slot type motor;
FIG. 4 is a schematic diagram II of the overall structure of a stator punching sheet of an unequal tooth width special-shaped slot type motor;
FIG. 5 is a schematic diagram III of the overall structure of a stator punching sheet of an unequal tooth width slot type special-shaped slot type motor;
FIG. 6 is a schematic diagram showing the overall structure of a stator punching sheet of an unequal tooth width special-shaped slot type motor;
FIG. 7 is a schematic diagram of magnetic field simulation of a stator punching sheet of an unequal tooth width slot type special-shaped slot type motor (the magnetic field strength is more than 1.4T for displaying gray scale);
FIG. 8 is a schematic structural view of an initial embodiment of a stator lamination of the present utility model;
FIG. 9 is a schematic diagram of a magnetic field simulation of an initial scheme of the stator lamination of the present utility model (gray scale is displayed with a magnetic field strength of 1.4T or more);
FIG. 10 is a schematic view of the overall structure of a stator lamination of another non-uniform tooth width slot type special-shaped slot type motor of the present utility model;
FIG. 11 is a schematic illustration of the stator slot angle in an initial embodiment of the present utility model;
FIG. 12 is a schematic view of the stator slot angle in the optimized version of the present utility model;
in the figure: numbers 1, 2, 3, 4, 5 and 6 in the groove type on the stator punching sheet sequentially represent a1 st abnormal shape groove, a 2 nd abnormal shape groove, a 3 rd abnormal shape groove, a 4 th abnormal shape groove, a 5 th abnormal shape groove and a 6 th abnormal shape groove; 7. stator punching; 8. screw holes.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present utility model, are within the scope of the present utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The optimization method of the stator punching sheet of the abnormal tooth width groove special-shaped groove type motor comprises the steps of firstly designing the basic shape of the stator punching sheet through the product cost, and then designing an initial groove type according to the power range and the efficiency requirement of the motor; then performing magnetic field simulation on the stator punching sheet through magnetic circuit simulation software, acquiring various magnetic circuit data, and adjusting stator slot types and tooth widths of different parts of the stator punching sheet according to the acquired magnetic circuit data;
the plurality of magnetic circuit data comprise data such as magnetic flux intensity, magnetic density and the like of the stator tooth parts and the stator yoke parts, and the outer contour shape of the stator punching sheet is adjusted according to uneven magnetic flux intensity distribution of the stator tooth parts and the stator yoke parts and uneven intervals between stator slots and the outer contour of the stator punching sheet; aiming at the magnetic densities of the stator tooth parts at different positions and the magnetic densities of the stator yoke parts, the stator groove type is adjusted to be a special groove, and the tooth widths are adjusted to be unequal tooth widths.
The optimization method can further optimize and adjust the actual situation of non-uniform magnetic circuits at all parts of the stator punching sheet, so that the whole magnetic circuits of the stator punching sheet are uniformly distributed, the utilization rate of the silicon steel sheet material of the punching sheet is improved, and the improvement of the motor efficiency and the cost control are facilitated.
By adopting the optimization method, the magnetic field strength of the main magnetic circuit is greatly reduced from the view of the magnetic field cloud chart and test data, so that the motor torque is improved, the motor efficiency is improved, and the motor loss is reduced. Under the condition of the same number of turns and current, the iron loss of the motor of the electronic punching sheet designed by the method is reduced, and the output torque is improved.
The optimization method considers the cost of the whole machine, simultaneously considers the performance of the whole machine, reduces the cost of the product, improves the performance of the product, and does not change the original scheme (basic shape) greatly in a large area, thereby having better productivity and practicability.
Further, the tooth part of the stator at least selects more than six test points of different groove types for testing, and at least two test points are selected on each tooth type; and the stator yoke part is at least tested by selecting more than five pairs of test points on different slot types, wherein the pairs of test points are symmetrical.
The arrangement of a plurality of test points on the plurality of groove patterns fully considers the positions of the tooth parts and the yoke parts, can more accurately reflect the data obtained by simulation and is more similar to the actual magnetic field receiving condition of the stator punching sheet; and the magnetic field distribution conditions under different tooth widths at symmetrical positions can be obviously seen by selecting test points in pairs, so that a basis is provided for the selection of the tooth widths.
Further, in the process of performing magnetic field simulation, the magnetic field simulation is performed again after the slot type and the tooth width are adjusted once, the simulation result is compared with the initial scheme and the previous scheme, and the proper result is gradually optimized and selected as the basis for mass production of stator products. Through multiple times of comparison and testing, the optimal scheme can be determined before the production of the product, the production cost can be reduced, and the waste of test samples can be reduced.
Further, the size of the inner hole of the stator punching sheet is in the range of 44-65 mm, the tooth width is 2-4.5 mm, the basic size of the stator punching sheet in the current refrigerator compressor is further reduced due to the intelligent and miniaturized trend of household appliances, the size of the motor and the stator punching sheet is gradually miniaturized, and the product volume is also required by the market while the cooling requirement is met.
Example 1:
as shown in fig. 3 to 7, a stator punching sheet designed by an optimization method of a stator punching sheet of a non-uniform tooth width slot type motor is characterized in that the stator punching sheet 7 is of a 24-slot structure with three screw holes 8, six special-shaped slot types are provided, the six special-shaped slot types comprise a1 st special-shaped slot 1, a 2 nd special-shaped slot 2, a 3 rd special-shaped slot 3, a 4 th special-shaped slot 4, a 5 th special-shaped slot 5 and a 6 th special-shaped slot 6, 24 slots are symmetrically arranged up and down in the center of an inner hole of the stator punching sheet, and upper semicircle is sequentially arranged from left to right in a mode of special-shaped slots 1-2-3-4-5-6-6-5-4-3-3-3-1.
That is to say, the stator punching sheet 7 has a vertically symmetrical structure, and the 1 st abnormal shape groove, the 2 nd abnormal shape groove, the 3 rd abnormal shape groove, the 4 th abnormal shape groove, the 5 th abnormal shape groove, the 6 th abnormal shape groove, the 5 th abnormal shape groove, the 4 th abnormal shape groove, the 3 rd abnormal shape groove and the 1 st abnormal shape groove are sequentially arranged from left to right in an upper semicircle.
Further, if the tooth width between the adjacent pair of the 1 st abnormal-shaped grooves is a, and the tooth width between the adjacent pair of the 6 th abnormal-shaped grooves is b, the tooth widths between the 1 st abnormal-shaped grooves and the adjacent 3 rd abnormal-shaped grooves, and between the 1 st abnormal-shaped grooves and the adjacent 2 nd abnormal-shaped grooves are (a+b)/2.
Further, a has a value of 2.4mm and b has a value of 2.67mm.
By adopting the size arrangement, the tooth width between the 1 st abnormal-shaped grooves is reduced, so that the area of the 1 st abnormal-shaped grooves is increased, the groove profile can shrink towards the circle center under the condition of maintaining the area unchanged, and the width of the yoke part is increased.
The conventional pear-shaped groove is arranged as the special-shaped groove, so that the width of the stator yoke corresponding to the outer contour of the special-shaped groove is more uniform, the outer contour can continuously shrink towards the circle center, and finally the width of the stator yoke corresponding to the outer contour of the special-shaped groove 1 is enlarged and uniform.
The tooth width between the 1 st abnormal-shaped groove and the 2 nd abnormal-shaped groove is (2.4+2.67)/2; the 2 nd abnormal-shaped groove is adjusted under the condition that the groove type area is consistent with the original pear-shaped groove, the design optimization value of the punching sheet aiming at the appearance is confirmed to be 10 degrees through simulation, as shown in fig. 4, the bottom of the outer contour of the groove is designed to be a straight line section, and in fact, the bottom can be an arc with a larger diameter and is approximate to a straight line.
As shown in fig. 5, the 1 st abnormal-shaped slot on the left side, the 2 nd abnormal-shaped slot on the left lower side, and the 1 st abnormal-shaped slot and the 3 rd abnormal-shaped slot on the right side are just corresponding to the outer contour of the stator punching sheet, and are preferably arranged in parallel with the outer contour of the corresponding side.
Further, the three screw holes are arranged on the stator punching sheet according to a delta shape, wherein one pair of the three screw holes are symmetrically arranged on the left side of the stator punching sheet, and the other pair of the three screw holes are arranged on the right middle line of the stator punching sheet.
Further, the fillets at two sides of the groove bottoms of the 1 st abnormal shape groove, the 4 th abnormal shape groove and the 5 th abnormal shape groove are R1.5mm and R2mm respectively, and the fillets at two sides of the groove bottoms of the 2 nd abnormal shape groove, the 3 rd abnormal shape groove and the 6 th abnormal shape groove are R2mm respectively.
Comparative example 1:
the initial scheme shown in fig. 8 is compared with the scheme of the first embodiment in a simulation, and the groove type and the outer contour distance indicated by the ABCDEF line segment in the figure are shown.
Table 1: stator tooth simulation results for two schemes
| Magnetic flux intensity/T of stator tooth test point | A | B | C | D | E | F |
| Initial protocol/mm | 0.51 | 0.62 | 0.96 | 1.20 | 1.43 | 1.51 |
| Optimized/mm according to the method | 0.56 | 0.66 | 0.97 | 1.20 | 1.43 | 1.51 |
Table 2: stator yoke simulation results of two schemes
| Stator yoke testingPoint magnetic flux intensity (T) | G | G1 | H | H1 | I | I1 | J | J1 | K | K1 |
| Initial protocol (mm) | 1.55 | 1.61 | 1.65 | 1.5 | 1.54 | 1.51 | 1.35 | 1.42 | 1.39 | 1.44 |
| Optimized according to the method (mm) | 1.51 | 1.55 | 1.57 | 1.46 | 1.49 | 1.44 | 1.32 | 1.34 | 1.28 | 1.32 |
In combination with tables 1 and 2 and as shown in fig. 9, the magnetic flux intensity is unevenly distributed throughout the initial solution, and the main reason for the uneven distribution is that the distance between the outer contour of the stator slot and the outer contour of the stator punching sheet is uneven.
After the optimization of the method, as shown in the graph of the magnetic field cloud and the data of each point, the optimized stator punching sheet greatly reduces the magnetic field intensity of the main magnetic circuit, so that the motor torque is improved, the motor efficiency is improved, the motor loss is reduced, the motor iron loss is reduced by 1-2% under the condition of the same number of turns and current, and the output torque is improved by 2-3%.
Example 2:
the difference between this embodiment and the first embodiment is the different external structure of the stator lamination.
As shown in fig. 10, the stator punching sheet 7 is designed with four screw holes 8 and is of a symmetrical structure, and only the slot type in the horizontal middle and the slot type in the vertical middle are improved in optimization, the tooth width of a pair of slot types in the horizontal middle is 3.5mm, the tooth width of a pair of slot types in the vertical middle is 3.64mm, the stator punching sheet is also arranged in unequal width, and the magnetic flux intensity distribution of the final stator punching sheet is more uniform.
Example 3:
in the stator punching sheet of the first embodiment designed by the method, since the slot type structure is optimized, the angle of each slot type is also changed, which is obviously different from the angle of the initial slot type.
Table 3: variation of groove type included angle under variation of groove type structure
The upper part of the stator laminations in Table 3 is numbered A1-A12 from left to right, again corresponding to the arrangement of the profiled slots 1-2-3-4-5-6-6-5-4-3-3-1 for the optimized stator laminations 7.
As can be seen from table 3, and referring to fig. 11 and 12, in the original solution, the groove bottom is basically a circumscribing circle, a fixed included angle is formed between the remaining two vertices and the vertical direction or the horizontal direction after the connection, and after each groove is fixed, as long as the number of grooves is fixed (e.g. 24 grooves), the angles of the vertical direction and the horizontal direction are also basically fixed, and the angle change range is smaller or the angle change range is related to the circumscribing circle. The included angles of the outer contours of the bottom of the groove type of the optimized stator punching sheet 7 are optimized, the included angles are not limited by the circumscribing circle, the optimized scheme has larger groove area and wider yoke width under the condition that the punching sheet cost is basically the same, and the improvement of the motor performance is facilitated.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The optimization method of the stator punching sheet of the irregular tooth width groove special-shaped groove type motor is characterized in that the optimization method firstly designs the basic shape of the stator punching sheet through the product cost, and then designs the initial groove type according to the power range and the efficiency requirement of the motor;
then performing magnetic field simulation on the initial slot type of the stator punching sheet through magnetic circuit simulation software, acquiring various magnetic circuit data, and adjusting the slot type and tooth width of the stator at different positions of the stator punching sheet according to the acquired magnetic circuit data;
the plurality of magnetic circuit data comprise magnetic flux intensity and magnetic density data of the stator tooth parts and the stator yoke parts, and the outer contour shape of the stator punching sheet is adjusted according to uneven magnetic flux intensity distribution of the stator tooth parts and the stator yoke parts and uneven intervals between stator slots and the outer contour of the stator punching sheet; aiming at the magnetic densities of the stator tooth parts at different positions and the magnetic densities of the stator yoke parts, the stator groove shape is adjusted to be a special groove, and the tooth widths are adjusted to be unequal tooth widths;
the stator tooth part is at least selected to test more than six test points on different groove types, and at least two test points are selected on each tooth type; the stator yoke part is at least tested by selecting more than five pairs of test points on different slot types, wherein the pairs of test points are symmetrical;
in the process of performing magnetic field simulation, the magnetic field simulation is performed again after the slot type and the tooth width are adjusted once, the simulation result is compared with the initial scheme and the previous scheme, and the proper result is gradually optimized and selected as the basis for mass production of stator products.
2. The optimization method of the stator punching sheet of the irregular tooth width groove special-shaped groove type motor of claim 1, wherein the size of an inner hole of the stator punching sheet ranges from 44 mm to 65mm, and the tooth width is 2mm to 4.5mm.
3. The stator punching sheet designed according to the optimization method of the stator punching sheet of the unequal tooth width groove special-shaped groove type motor of claim 1 or 2, wherein the stator punching sheet is of a three screw hole 24-groove structure and is provided with six special-shaped grooves, the six special-shaped grooves comprise a1 st special-shaped groove, a 2 nd special-shaped groove, a 3 rd special-shaped groove, a 4 th special-shaped groove, a 5 th special-shaped groove and a 6 th special-shaped groove, 24 grooves are symmetrically arranged from top to bottom in the center of an inner hole of the stator punching sheet, and upper semicircles are sequentially arranged from left to right in a mode of special-shaped grooves 1-2-3-4-5-6-6-5-4-3-3-1.
4. The stator punching sheet designed by the optimization method of the non-uniform tooth width groove special-shaped groove type motor stator punching sheet according to claim 3, wherein the tooth width between the adjacent pair of the 1 st special-shaped grooves is set to be a, the tooth width between the adjacent pair of the 6 th special-shaped grooves is set to be b, and the tooth widths between the 1 st special-shaped groove and the adjacent 3 rd special-shaped grooves, and between the 1 st special-shaped groove and the adjacent 2 nd special-shaped grooves are all (a+b)/2.
5. The stator lamination of the optimization method of the stator lamination of the irregular tooth width groove special-shaped groove type motor of claim 4, wherein the value of a is 2.4mm, and the value of b is 2.67mm.
6. The stator lamination designed by the optimization method of the stator lamination of the abnormal tooth width groove special-shaped groove type motor according to claim 3, wherein the angle range of the bottom outline of the 12 special-shaped grooves from the left side to the right side of the upper half part of the stator lamination is as follows: the included angles of the 1 st abnormal-shaped groove on the left side and the right side and the vertical line are 0 degrees, the included angle of the 2 nd abnormal-shaped groove on the left side and the vertical line are 7.5-10 degrees, the included angle of the 3 rd abnormal-shaped groove on the left side and the vertical line are 37.5-42.5 degrees, the included angles of the 4 th abnormal-shaped groove on the left side and the right side and the horizontal line are 20-21.45 degrees, the included angles of the 5 th abnormal-shaped groove on the left side and the right side and the horizontal line are 0 degrees, the included angles of the two 6 th abnormal-shaped grooves in the middle and the horizontal line are 7.5 degrees, and the included angles of the two continuous 3 rd abnormal-shaped grooves on the right side and the right inclined line are 5-12.5 degrees and 2.5-5 degrees respectively.
7. The stator punching sheet designed by the optimization method of the non-uniform tooth width groove type motor stator punching sheet according to claim 3, wherein the fillets on two sides of the bottoms of the 1 st abnormal shape groove, the 4 th abnormal shape groove and the 5 th abnormal shape groove are R1.5mm and R2mm respectively, and the fillets on two sides of the bottoms of the 2 nd abnormal shape groove, the 3 rd abnormal shape groove and the 6 th abnormal shape groove are R2mm respectively.
8. An iron core is characterized in that the iron core is manufactured by stator punching sheets designed by an optimization method of the stator punching sheets of the unequal tooth width groove special-shaped groove type motor according to claim 3.
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| CN114552900A (en) | 2022-05-27 |
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