CN103746474A - Stator core punching sheet, motor stator core and motor - Google Patents
Stator core punching sheet, motor stator core and motor Download PDFInfo
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- CN103746474A CN103746474A CN201310462519.7A CN201310462519A CN103746474A CN 103746474 A CN103746474 A CN 103746474A CN 201310462519 A CN201310462519 A CN 201310462519A CN 103746474 A CN103746474 A CN 103746474A
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Abstract
The invention is suitable for the electrical field of motors and discloses a stator core punching sheet, a motor stator core and a motor. The above stator core punching sheet comprises four first slot groups and four second slot groups which are alternatively and circumferentially distributed. The second slot groups and the first slot groups are symmetrically arranged. Each first slot group contains a first slot position, a second slot position, a third slot position and a fourth slot position. The slot positions and adjacent slog groups are respectively isolated from each other by tooth parts of the same width. The depth of the first slot position is less than the depth of the second slot position. The depth of the second slot position is less than the depth of the third slot position. The depth of the third slot position is less than or equal to the depth of the fourth slot position. The above motor stator core comprises at least two of the above stator core punching sheets. The above motor comprises an end cap and the above stator core punching sheet. According to the stator core punching sheet, the motor stator core and the motor provided by the invention, utilization rate of an iron core is raised, main and auxiliary magnetic circuit distribution is reasonable, and the motor has high efficiency and low cost.
Description
Technical field
The invention belongs to technical field of motors, relate in particular to a kind of stator core stamping sheet, motor stator core and motor.
Background technology
In prior art, mostly to be flute profile identical for the stator punching of internal rotor single-phase asynchronous motor, the punching being uniformly distributed along the circumference, also there is a small amount of special-shaped slot punching, flute profile is axial symmetry flute profile, flute profile is single, just difference in size, this kind of punching mostly is from threephase asynchronous machine bathtub construction indiscriminately imitates, and does not take into full account the characteristic of the magnetic circuit of single-phase asynchronous motor.In prior art, apply the single-phase asynchronous motor of this punching, its principal phase, parafacies magnetic circuit symmetry, magnetic resistance is identical.During motor nominal operation, its major and minor phase magnetomotive force can not be identical.Asymmetric magnetomotive force is added on symmetrical magnetic circuit, causes magnetic flux skewness weighing apparatus on iron core, easily cause part core sataration, and another part iron core utilization is very low, certainly will cause the waste of the low and core material of electric efficiency.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of stator core stamping sheet, motor stator core and motor are provided, its electric efficiency is high.
Technical scheme of the present invention is: a kind of stator core stamping sheet, comprise four group of first groove group and four group of second groove group, each described the first groove group, the second groove group is alternately circumferentially arranged, and be symmetrical arranged between described the second groove group and described the first groove group, described in every group, the first groove group comprises the first adjacent successively groove position, the second groove position, three-flute position and the 4th groove position, between each described groove position and between adjacent groove group, by tooth portion, separate, the both sides of the each described tooth portion mutually width of parallel and each described tooth portion all equate, the degree of depth of described the first groove position is less than the degree of depth of described the second groove position, the degree of depth of described the second groove position is less than the degree of depth of described three-flute position, the degree of depth of described three-flute position is less than or equal to the degree of depth of described the 4th groove position.
Alternatively, described stator core stamping sheet has orthogonal the first symmetrical center line and the second symmetrical center line, the two side of wherein said the first groove position all with described the first symmetrical center line or the second symmetrical centre line parallel.
Alternatively, the two side of described three-flute position is symmetrical arranged centered by the first line of symmetry, the two side of described the 4th groove position is symmetrical arranged centered by the second line of symmetry, the intersection point of described the first symmetrical center line and the second symmetrical center line is symmetrical centre point, and described the first line of symmetry and the second line of symmetry are all through described symmetrical centre point.
The present invention also provides a kind of motor stator core, and described electronics iron core is formed by the stacking lamination of above-mentioned stator core stamping sheet.
The present invention also provides a kind of motor, comprises stator module, rotor assembly and end cap, and described stator module comprises by the stacking stator core of making of above-mentioned stator core stamping sheet.
Alternatively, in the first groove position of described stator core stamping sheet, the second groove position, three-flute position, be arranged with auxiliary winding, in described the second groove position, three-flute position, the 4th groove position, be arranged with main winding.。
Alternatively, described motor also comprises back-up ring, described back-up ring by rivet in described end cap.
Alternatively, on described motor stator core, be provided with pilot hole, on described end cap, be provided with the reference column mating with described pilot hole.
Alternatively, described rotor assembly comprises armature spindle, on described armature spindle, is arranged with belt pulley, and described armature spindle and described belt pulley cooperation place are provided with knurling structure.
Alternatively, described main winding arranges near the bottom of groove position, and auxiliary winding is near the notch setting of groove position.
Stator core stamping sheet provided by the present invention, the motor stator core with this stator core stamping sheet and motor, it is by the groove position that the tooth portion that width is equal is set on punching body and has different groove depths, and the width of each tooth portion equates, make magnetic flux distributing equilibrium on iron core, improve iron core utilization, major and minor phase magnetic circuit distributes rationally, the material that avoids waste, and electric efficiency is high and cost is low.
Accompanying drawing explanation
Fig. 1 is the front view of the stator core stamping sheet that provides of the embodiment of the present invention;
Fig. 2 is the partial schematic diagram of the stator core stamping sheet that provides of the embodiment of the present invention;
Fig. 3 is the front view of the motor that provides of the embodiment of the present invention;
Fig. 4 is the generalized section of the C-C section of motor in Fig. 3;
Fig. 5 is the plane decomposing schematic representation of the motor that provides of the embodiment of the present invention;
Fig. 6 is the assembling front view of end cap, back-up ring and shock absorbing ring in the motor that provides of the embodiment of the present invention;
Fig. 7 is the assembling left view of end cap in Fig. 6, back-up ring and shock absorbing ring;
Fig. 8 is the decomposing schematic representation of end cap, back-up ring and shock absorbing ring in the motor that provides of the embodiment of the present invention;
Fig. 9 is the front view of end cap in the motor that provides of the embodiment of the present invention;
Figure 10 is the motor rotor axle that provides of the embodiment of the present invention and the part section schematic views of belt pulley.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
It should be noted that, when element is called as " being fixed on " or " being arranged at " another element, it can be directly on another element or may have centering elements simultaneously.When an element " being connected in " another element of being known as, it can be directly connected to another element or may have centering elements simultaneously.
Also it should be noted that, the orientation term such as left and right, upper and lower in the present embodiment, is only relative concept or take the normal operating condition of product as reference each other, and should not be regarded as have restrictive.
As depicted in figs. 1 and 2, a kind of stator core stamping sheet 1 that the embodiment of the present invention provides, can be applicable on the motors such as single-phase asynchronous motor.Said stator core stamping 1 can adopt metallic plate punching to form.Stator core stamping sheet 1 comprises four group of first groove group 11 and four group of second groove group 12, each the first groove group 11, the second groove group 12 are alternately circumferentially arranged, and between the second groove group 12 and the first groove group 11, be symmetrical arranged, along thering is one group of first groove group 11 and one group of second groove group 12 in the circumferential 90 degree angular range in stator core stamping sheet 1 center.Every group of first groove group 11 comprises adjacent successively the first groove position 111, the second groove position 112, three-flute position 113 and the 4th groove position 114.Because the second groove group 12 and the first groove group 11 are symmetrical arranged, the second groove group 12 comprises the 5th groove position 115, the 6th groove position 116, the 7th groove position 117 and the 8th groove position 118 that set gradually, in adjacent the first groove group 11 and the second groove group 12, wherein the 5th groove position 115 is identical with the 4th groove position 114 shapes and be symmetrical arranged, the 6th groove position 116 is identical with three-flute position 113 shapes and be symmetrical arranged, the 7th groove position 117 is identical with the second groove position 112 shapes and be symmetrical arranged, and the 8th groove position 118 is identical with the first groove position 111 shapes and be symmetrical arranged.In the present embodiment, on stator core stamping sheet 1, be provided with altogether 32 groove positions, be followed successively by the first groove position 111, the second groove position 112, three-flute position 113, the 4th groove position 114, the 5th groove position 115, the 6th groove position 116, the 7th groove position 117 and the 8th groove position 118, the circulation of totally 4 groups of above-mentioned 8 groove positions.Between each groove position and between adjacent groove group, by tooth portion 13, separate, adjacent the 8th groove position 118 and the first groove position 111 are also separated by tooth portion 13.The two side of the each tooth portion 13 mutually width L of parallel and each tooth portion 13 all equates, each tooth portion 13 is parallel teeth.The degree of depth of the first groove position 111 is less than the degree of depth of the second groove position 112, and the degree of depth of the second groove position 112 is less than the degree of depth of three-flute position 113, and the degree of depth of three-flute position 113 is less than or equal to the degree of depth of the 4th groove position 114.Groove position is darker, and its leakage reactance is larger.Like this, the auxiliary winding of motor can be set around in the first groove position 111 that the degree of depth is less, the second groove position 112, three-flute position 113, the 6th groove position 116, the 7th groove position 117, the 8th groove position 118, main winding can be set around in the second darker groove position 112 of groove position, three-flute position 113, the 4th groove position 114, the 5th groove position 115, the 6th groove position 116, the 7th groove position 117.Auxiliary winding only takies sulculus, reduces to greatest extent its shared space, and be conducive to like this main winding and can take more space, thus the efficiency of lifting motor.Such design can improve the utilance of stator core stamping sheet 1 material, is beneficial to the noise that improves motor, and tooth portion 13 magnetic are close uniform, reduces the leakage field of auxiliary winding tooth portion 13, can increase the ratio of auxiliary winding D.C. resistance and induction reactance, thereby can improve electric motor starting moment.Stator core stamping sheet 1 provided by the present invention, while being particularly applied in major and minor mutually unbalanced monopole asynchronous motor, the magnetic flux relative equilibrium that distributes on iron core, iron core utilization is high, electric efficiency is high, can effectively reduce the use amount of same capacity iron core material for generator of the same type.By different groove bit depth is set, effectively improved the utilization of material, by having increased the shared space of main winding, dwindle the shared space of auxiliary winding simultaneously, because the auxiliary winding of motor is only participated in the startup of motor, auxiliary winding wire diameter, the number of turn are all little than main winding, and space that need only be less is just passable.
Particularly, as depicted in figs. 1 and 2, stator core stamping sheet 1 has orthogonal the first symmetrical center line 101 and the second symmetrical center line 102, and wherein the two side 1111,1112 of the first groove position 111 is all parallel with the first symmetrical center line 101 or the second symmetrical center line 102.The first symmetrical center line 101 and the second symmetrical center line 102 demarcate four group of first groove group 11 and the second groove group 12 respectively, the first symmetrical center line 101 and the second symmetrical center line 102 form 4 90 degree quadrant angle regions at stator core stamping sheet 1, in each 90 degree quadrant angle regions, have one group of first groove group 11 and one group of second groove group 12.In the present embodiment, the profile of stator core stamping sheet 1 is square, and the first symmetrical center line 101 and the second symmetrical center line 102 be the tooth portion 13 through adjacent the first groove group 11 and the second groove group 12 and parallel with the side of stator core stamping sheet 1 respectively respectively.The intersection point of the first symmetrical center line 101 and the second symmetrical center line 102 is symmetrical centre point 100, and symmetrical centre point 100 can be positioned at the center of stator core stamping sheet 1.Cross this symmetrical centre point 100 and have the 3rd symmetrical center line 103 and the 4th symmetrical center line 104 that are 45 degree angles with the first symmetrical center line 101 and the second symmetrical center line 102, one group of first groove group 11 and one group of second groove group 12 in same 90 degree quadrant angle regions are symmetrical arranged with the 3rd symmetrical center line 103 or the 4th symmetrical center line 104.In Fig. 1, the 5th groove position 115 and the 4th groove position 114 are symmetrical arranged with the 3rd symmetrical center line 103, the 6th groove position 116 and three-flute position 113 are symmetrical arranged with the 3rd symmetrical center line 103, the 7th groove position 117 and the second groove position 112 are symmetrical arranged with the 3rd symmetrical center line 103, and the 8th groove position 118 and the first groove position 111 are symmetrical arranged with the 3rd symmetrical center line 103.
As depicted in figs. 1 and 2, the two side of three-flute position 113 is symmetrical arranged centered by the first line of symmetry 105, the two side of the 4th groove position 114 is symmetrical arranged centered by the second line of symmetry 106, the first line of symmetry 105 and the second line of symmetry 106 are all through symmetrical centre point 100, further to improve the efficiency of motor.Correspondingly, in the second groove group 12 with the symmetrical center line of the 6th groove position 116 of three-flute position 113 symmetries, the second groove group 12 in the symmetrical center line of the 5th groove position 115 of the 4th groove position 114 symmetries also through symmetrical centre point 100.
Particularly, as depicted in figs. 1 and 2, the first groove position 111, the second groove position 112, three-flute position 113 and the 4th groove are round bottomed vessel, and on stator core stamping sheet 1, all grooves position is round bottomed vessel, and tooth portion 13 magnetic are close uniform, reduce leakage field, and are easy to processing.
The present embodiment also provides a kind of motor stator core 24, and this motor stator core 24 is formed by the stacking lamination of above-mentioned stator core stamping sheet 1.In the present embodiment, comprise at least two above-mentioned stator core stamping sheets 1, the stacking setting of each stator core stamping sheet 1 is to form motor stator core 24.Porose position can be set, to adopt axostylus axostyle to pass in position, hole stacking each stator core stamping sheet 1 fixing formation motor stator core 24 on stator core stamping sheet 1.
As shown in Fig. 3～Fig. 5, the present embodiment also provides a kind of motor 2, comprises stator module, rotor assembly 22 and end cap 21.Stator module comprises by the stacking motor stator core of making 24 of above-mentioned stator core stamping sheet 1.。Stator core stamping sheet 1 is provided with at least two, and stacking setting of each stator core stamping sheet 1 forms above-mentioned motor stator core 24.Motor stator core 24 can be fixedly installed in housing, and rotor assembly 22 is rotatably arranged in motor stator core 24, and the machine shaft 23 that is connected in rotor assembly 22 is extended outside end cap 21.
As shown in Fig. 1～Fig. 5, in the first groove position 111, the second groove position 112 and the groove position identical with the first groove position 111, second groove position 112 degree of depth, be arranged with auxiliary winding, in three-flute position 113, the 4th groove position 114 and the groove position identical with three-flute position 113, the 4th groove position 114 degree of depth, be arranged with main winding.Auxiliary winding wire diameter, the number of turn are all little than main winding.By different groove bit depth is set, the utilization that has effectively improved material by having increased the shared space of main winding, is dwindled the shared space of auxiliary winding simultaneously, and iron core utilization is high, and electric efficiency is high.
Particularly, main winding can arrange near the bottom of groove position, and auxiliary winding can be near the notch setting of groove position.
Particularly, as shown in Fig. 4～Fig. 8, motor 2 also comprises back-up ring 212, back-up ring 212 by rivet in end cap 21.In prior art, in motor manufacturing process, some peripheral components often to be installed on motor, facilitate the installation of motor on complete machine, use.One of them conventional peripheral components-circular cylindrical cushion rubber, is sleeved on the reserved boss of electric motor end cap, and then back-up ring is installed on boss, prevents that cushion rubber from coming off.The mounting means of prior art guide ring and end cap is that back-up ring circularizes, and is sleeved on end cap secondary boss, then by frock by the compressive strain of secondary boss, fix back-up ring.This kind of fixed form end cap deflection is large, and the pressure needing is large.Motor easily causes greatly bearing chamber distortion because end cap is stressed, thereby causes motor noise bad.In addition, back-up ring does not cover end cap centre die cavity, and dust easily enters bearing chamber, and structural reliability is poor.In the present embodiment, by adopting rivet post 211 that back-up ring 212 is riveted, by rivet post 211 rivetings, deflection is little, and in riveting process, end cap 21 is stressed little, and the distortion that has effectively reduced bearing chamber improves yields.Back-up ring 212 belows are provided with shock absorbing ring 213.In addition, back-up ring 212 can need to be made various shapes according to motor, and can effectively cover die cavity, prevents that dust from entering bearing chamber, and product is can reliability good.
Particularly, as shown in Fig. 1～Fig. 9, on motor stator core 24, be provided with pilot hole 120, on end cap 21, be provided with the reference column 214 mating with pilot hole 120.In prior art, end cap is yielding in the time of processing seam and bearing chamber, and machining accuracy is poor, easily causes motor gas-gap bad.In order to improve machining accuracy, in prior art, in end cover designs, to design a lot of reinforcements, reduce the deformation of workpiece, end cap heaviness, material cost, processing cost are high.The motor that the application provides, by end cap 21 relevant positions, increase reference column 214 be used for and motor stator core 24 on pilot hole coordinate.21 of end caps need machining bearing chamber, compared to the prior art reduce the operation of processing together seam, have reduced the risk of end cap 21 because of machining deformation.And end cap 21 can save the reinforcement that end cap 21 lies around, design is light and handy, has reduced material cost, processing cost.
Particularly, as shown in Fig. 4～Figure 10, motor has armature spindle 23, is arranged with belt pulley 25 on armature spindle 23, and armature spindle 23 is provided with knurling structure with belt pulley 25 cooperation places.In prior art, for example centrifugal switch motor middle belt pulley is connected with armature spindle by threaded engagement.Beat large, processing cost is high, and is only suitable for and the motor singly turning to.Owing to wanting machining screw above armature spindle, reduced the intensity of armature spindle at belt pulley place.In the present embodiment, belt pulley 25 and armature spindle 23 adopt annular knurl to coordinate, and belt pulley 25 is beated little.Armature spindle 23 only needs annular knurl with belt pulley 25 cooperation places, and technique is simple, and precision is high, and armature spindle 23 intensity are large, processing cost is low.
Stator core stamping sheet provided by the present invention, the motor stator core with this stator core stamping sheet and motor, it is by the groove position that the tooth portion 13 that width is equal is set on stator core stamping sheet 1 and has different groove depths, and the width of each tooth portion 13 equates, make magnetic flux distributing equilibrium on iron core, improve iron core utilization, major and minor phase magnetic circuit distributes rationally, the material that avoids waste, and electric efficiency is high.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace or improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a stator core stamping sheet, it is characterized in that, comprise four group of first groove group and four group of second groove group, each described the first groove group, the second groove group is alternately circumferentially arranged, and be symmetrical arranged between described the second groove group and described the first groove group, described in every group, the first groove group comprises the first adjacent successively groove position, the second groove position, three-flute position and the 4th groove position, between each described groove position and between adjacent groove group, by tooth portion, separate, the both sides of the each described tooth portion mutually width of parallel and each described tooth portion all equate, the degree of depth of described the first groove position is less than the degree of depth of described the second groove position, the degree of depth of described the second groove position is less than the degree of depth of described three-flute position, the degree of depth of described three-flute position is less than or equal to the degree of depth of described the 4th groove position.
2. stator core stamping sheet as claimed in claim 1, it is characterized in that, described stator core stamping sheet has orthogonal the first symmetrical center line and the second symmetrical center line, the two side of wherein said the first groove position all with described the first symmetrical center line or the second symmetrical centre line parallel.
3. stator core stamping sheet as claimed in claim 2, it is characterized in that, the two side of described three-flute position is symmetrical arranged centered by the first line of symmetry, the two side of described the 4th groove position is symmetrical arranged centered by the second line of symmetry, the intersection point of described the first symmetrical center line and the second symmetrical center line is symmetrical centre point, and described the first line of symmetry and the second line of symmetry are all through described symmetrical centre point.
4. a motor stator core, is characterized in that, this motor stator core is formed by the stacking lamination of the stator core stamping sheet described in any one in claims 1 to 3.
5. a motor, comprises stator module, rotor assembly and end cap, it is characterized in that, described stator module comprises by the stacking motor stator core of making of the stator core stamping sheet described in any one in claims 1 to 3.
6. motor as claimed in claim 5, is characterized in that, in the first groove position of described stator core stamping sheet, the second groove position, three-flute position, is arranged with auxiliary winding, in described the second groove position, three-flute position, the 4th groove position, is arranged with main winding.
7. the motor as described in claim 5 or 6, is characterized in that, described motor also comprises back-up ring, described back-up ring by rivet in described end cap.
8. the motor as described in claim 5 or 6, is characterized in that, on described motor stator core, is provided with pilot hole, is provided with the reference column mating with described pilot hole on described end cap.
9. the motor as described in claim 5 or 6, is characterized in that, described rotor assembly comprises armature spindle, on described armature spindle, is arranged with belt pulley, and described armature spindle and described belt pulley cooperation place are provided with knurling structure.
10. motor as claimed in claim 6, is characterized in that, described main winding arranges near the bottom of groove position, and auxiliary winding is near the notch setting of groove position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310462519.7A CN103746474A (en) | 2013-09-30 | 2013-09-30 | Stator core punching sheet, motor stator core and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310462519.7A CN103746474A (en) | 2013-09-30 | 2013-09-30 | Stator core punching sheet, motor stator core and motor |
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| CN103746474A true CN103746474A (en) | 2014-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310462519.7A Pending CN103746474A (en) | 2013-09-30 | 2013-09-30 | Stator core punching sheet, motor stator core and motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617688A (en) * | 2015-01-30 | 2015-05-13 | 广东威灵电机制造有限公司 | Motor and motor stator |
| WO2017113512A1 (en) * | 2015-12-31 | 2017-07-06 | 中山大洋电机股份有限公司 | Stator punching sheet, stator assembly and external rotor motor |
| CN114552900A (en) * | 2022-01-27 | 2022-05-27 | 黄石东贝压缩机有限公司 | Optimization method of unequal-tooth-width-groove special-shaped groove type motor stator punching sheet and iron core |
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| JP3004420B2 (en) * | 1991-10-04 | 2000-01-31 | 株式会社日立製作所 | Stator core |
| CN201947071U (en) * | 2011-03-01 | 2011-08-24 | 中山大洋电机制造有限公司 | Motor stator lamination |
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| CN202285350U (en) * | 2011-09-28 | 2012-06-27 | 奉化市微分电机有限公司 | Motor stator stamped sheet structure with special-shaped slots |
| CN102710079A (en) * | 2012-05-29 | 2012-10-03 | 赵晓东 | Permanent magnet synchronous motor with dual annular rotation heat tube for cooling rotor |
| CN103001345A (en) * | 2012-09-30 | 2013-03-27 | 常州亚通杰威电机有限公司 | Motor stator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US1723912A (en) * | 1928-02-15 | 1929-08-06 | Gen Electric | Dynamo-electric machine |
| JP3004420B2 (en) * | 1991-10-04 | 2000-01-31 | 株式会社日立製作所 | Stator core |
| CN102401111A (en) * | 2010-09-15 | 2012-04-04 | 常州新亚电机有限公司 | Motor belt pulley and assembling method thereof |
| CN201947071U (en) * | 2011-03-01 | 2011-08-24 | 中山大洋电机制造有限公司 | Motor stator lamination |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617688A (en) * | 2015-01-30 | 2015-05-13 | 广东威灵电机制造有限公司 | Motor and motor stator |
| CN104617688B (en) * | 2015-01-30 | 2018-09-11 | 广东威灵电机制造有限公司 | motor and its stator |
| WO2017113512A1 (en) * | 2015-12-31 | 2017-07-06 | 中山大洋电机股份有限公司 | Stator punching sheet, stator assembly and external rotor motor |
| CN114552900A (en) * | 2022-01-27 | 2022-05-27 | 黄石东贝压缩机有限公司 | Optimization method of unequal-tooth-width-groove special-shaped groove type motor stator punching sheet and iron core |
| CN114552900B (en) * | 2022-01-27 | 2024-02-23 | 黄石东贝压缩机有限公司 | Optimization method of stator punching sheet of irregular tooth width groove special-shaped groove type motor and iron core |
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