CN112583143B - Stator core, stator, permanent magnet synchronous motor, compressor and refrigeration equipment - Google Patents
Stator core, stator, permanent magnet synchronous motor, compressor and refrigeration equipment Download PDFInfo
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- CN112583143B CN112583143B CN202011376813.2A CN202011376813A CN112583143B CN 112583143 B CN112583143 B CN 112583143B CN 202011376813 A CN202011376813 A CN 202011376813A CN 112583143 B CN112583143 B CN 112583143B
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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
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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
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient 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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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a stator core, a stator, a permanent magnet synchronous motor, a compressor and refrigeration equipment. Wherein, stator core includes: the stator punching sheets are stacked along the axial direction of the inner hole and comprise a plurality of stator teeth distributed along the circumferential direction, each stator tooth comprises a tooth part and a tooth shoe connected to the tooth part, and the tooth shoes are arranged in an enclosing manner to form the inner hole; the stator punching sheets comprise at least one first stator punching sheet, a concave part is arranged on the inner peripheral wall of at least one tooth shoe of the first stator punching sheet, the tooth shoe comprises a first tooth shoe part, and part of the concave part is located in an area of one side, facing the first tooth shoe part, of the symmetrical center line of the tooth part. Therefore, radial electromagnetic waves generated by the interaction of the armature magnetic field harmonic waves and the rotor magnetic field harmonic waves are reduced, the deformation of the stator core is reduced, the vibration noise of the key frequency band of the motor is obviously improved, and the hearing of the compressor is effectively improved.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a stator core, a stator, a permanent magnet synchronous motor, a compressor and a refrigerating device.
Background
In the related art, in a rotary direct-current variable-frequency compressor, a built-in permanent magnet motor is generally adopted as a motor, and in the design of the motor with higher power density, after the motor is electrified, time and space harmonics of a synthetic magnetic field generated after a stator magnetic field and a rotor magnetic field act can generate larger vibration noise, so that the silence and the comfort level required by a user cannot be met.
Disclosure of Invention
The present invention has been made to solve at least one of the problems occurring in the prior art or the related art.
To this end, a first aspect of the invention proposes a stator core.
A second aspect of the invention is to propose a stator.
A third aspect of the present invention is to provide a permanent magnet synchronous motor.
A fourth aspect of the present invention is to provide a compressor.
A fifth aspect of the present invention is to provide a refrigeration apparatus.
In view of the above, according to a first aspect of the present invention, there is provided a stator core, the stator core including an inner bore, the stator core further including: the stator punching sheets are stacked along the axial direction of the inner hole and comprise a plurality of stator teeth distributed along the circumferential direction, each stator tooth comprises a tooth part and a tooth shoe connected to the tooth part, and the tooth shoes are arranged in an enclosing manner to form the inner hole; the stator punching sheets comprise at least one first stator punching sheet, a concave part is arranged on the inner peripheral wall of at least one tooth shoe of the first stator punching sheet, the tooth shoe comprises a first tooth shoe part, and part of the concave part is located in an area of one side, facing the first tooth shoe part, of a symmetrical center line of the tooth part.
The invention provides a stator core which comprises a plurality of stator punching sheets stacked along the axial direction of an inner hole, wherein each stator punching sheet is provided with a plurality of stator teeth arranged circumferentially, each stator tooth comprises a tooth part and a tooth shoe, the tooth shoe is arranged on one side of the tooth part close to the inner hole, and the inner hole is formed by surrounding the tooth shoes. Specifically, the plurality of stator laminations comprise at least one first stator lamination, and the inner peripheral wall of at least one tooth shoe of the first stator lamination is provided with a concave part. Because the radial component makes the vibration deformation that stator core produced be the main source of electromagnetic noise, through set up the depressed part on the stator punching sheet, be favorable to restraining the harmonic of air gap magnetic field, reduce the radial electromagnetic force wave that armature magnetic field harmonic and rotor magnetic field harmonic acted on mutually and produce, reduce stator core's deformation, show the vibration noise who improves PMSM key frequency channel, effectively improve the compressor sense of hearing, simultaneously, the tooth boots are provided with first tooth boots portion, part depressed part is located the regional of one side of the symmetry central line towards first tooth boots portion of tooth portion, through setting up first tooth boots portion, be favorable to reinforcing back emf, and can improve PMSM's manufacturability.
It can be understood that the plurality of stator laminations of the stator core can be formed by stacking the first stator laminations, all stator teeth on the first stator laminations can be provided with the concave parts, and part of the stator teeth can also be provided with the concave parts, so that the air gap between the stator and the rotor can be increased; the stator punching sheet structure can also be formed by alternately stacking at least two stator punching sheets comprising a first stator punching sheet, namely, part of the stator punching sheets are provided with concave parts, even if the corresponding relation between the outer periphery of the motor rotor and the inner periphery of the stator is in a point-to-point surface mode, the order of radial electromagnetic force waves can be improved by improving stator slots, the lowest spatial order component of the radial electromagnetic force waves is further reduced, the low-frequency energy efficiency of the motor is favorably improved, and the mass production manufacturability is improved.
In addition, according to the stator core in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in any of the above technical solutions, further, on a cross section perpendicular to the axis of the rotor, along the rotation direction of the rotor, the shortest distance from any point on the inner wall surface of the recess portion to the rotation center of the rotor gradually decreases.
In the technical scheme, the rotor penetrates through an inner hole of the stator core, and on a section perpendicular to the axis of the rotor, the shortest distance from any point on the inner wall surface of the recessed part facing the rotor to the rotation center of the rotor is gradually reduced along the rotation direction of the rotor, namely the minimum distance between two adjacent points on the inner wall surface and the rotation center of the rotor is different. Therefore, the size of the sunken part is optimized, the air gap magnetic field harmonic wave and the radial electromagnetic force wave are further reduced, the electromagnetic noise is reduced, and meanwhile the sunken part is prevented from being influenced by the increase of the magnetic resistance due to the fact that the air gap generated by the radial oversize is too large.
In any of the above technical solutions, further, the tooth shoe further includes: and the second tooth shoe part is arranged in the area of one side, which is far away from the first tooth shoe part, of the symmetrical center line of the tooth part along the rotating direction of the rotor, and is provided with a concave part.
In this embodiment, a first tooth shoe and a second tooth shoe are provided on either side of a symmetrical center line of the tooth portion in the rotational direction of the rotor, i.e., the tooth shoes include the first tooth shoe and the second tooth shoe in this order in the rotational direction of the rotor. The second tooth boots are provided with the depressed part for the air gap between second tooth boots and the rotor changes, thereby improves the low order force wave, further improves the vibration noise of motor key frequency channel.
In any of the above technical solutions, further, in a radial direction of the inner hole, a first connection length of the recessed portion between the two end points on the inner circumferential wall is greater than a half of a second connection length between the two end points of the inner circumferential wall.
In the technical scheme, on the radial section of the first stator punching sheet along the inner hole, the first connecting line length of the concave part between two end points of the inner peripheral wall is greater than half of the second connecting line length between the two end points of the inner peripheral wall, namely the area occupied by the concave part on the inner peripheral wall is greater than the area occupied by the non-concave part. Therefore, the optimal gap is kept between the stator teeth and the magnetic poles of the rotor by optimizing the size of the concave part, the radial electromagnetic force wave is reduced to the maximum extent, the air gap magnetic resistance between the stator teeth and the magnetic poles of the rotor is further changed, the 'tooth space effect' is further improved, and the purposes of reducing vibration and reducing noise generated in the operation process of the brushless direct current motor are achieved.
In any of the above technical solutions, further, the plurality of stator laminations further includes at least one second stator lamination; along the axial of hole, the thickness of first stator punching and second stator punching is L1 and L2 respectively, satisfies following relational expression: L2/L1 is more than or equal to 0.001 and less than or equal to 0.6.
In this technical scheme, a plurality of stator punching still include at least one second stator punching, also include the stator punching of two kinds of not isostructures for stator core, adopt two kinds of punching structures to be favorable to improving the low frequency energy efficiency of motor simultaneously, compromise and improve the volume production manufacturability. Along the axial of hole, also be the direction of piling up of a plurality of stator punching, the thickness L1 of whole first stator punching in a plurality of stator punching and the thickness L2 of whole second stator punching in a plurality of stator punching satisfy following relational expression: L2/L1 is more than or equal to 0.001 and less than or equal to 0.6. Thereby assemble according to different axial thickness through optimizing two kinds of stator towards the piece, inject the quantity that first stator is towards the piece and be greater than the quantity of second stator towards the piece, promote the shared space of depressed part to compromise motor vibration noise and efficiency.
It can be understood that, as the stator punching sheet of the same stator core, the first stator punching sheet and the second stator punching sheet have the same shape and size, and the difference lies in that the first stator punching sheet is provided with the depressed part.
In any one of the above technical solutions, further, the first stator punching sheet and the second stator punching sheet are alternately stacked along the axial direction of the inner hole.
In the technical scheme, the first stator punching sheets and the second stator punching sheets are randomly and alternately stacked, and the number of the second stator punching sheets is smaller than that of the first stator punching sheets. The gap between the stator and the rotor is favorably improved, so that the radial electromagnetic wave generated by the interaction of the armature magnetic field harmonic and the rotor magnetic field harmonic is reduced, the deformation of a stator core is reduced, the vibration noise of a key frequency band of the motor is obviously improved, and the hearing of the compressor is effectively improved.
In any of the above technical solutions, further, the plurality of first stator punching sheets are continuously stacked to form a first punching section, the plurality of second stator punching sheets are continuously stacked to form a second punching section, and the first punching section and the second punching section are alternately stacked in the axial direction of the inner hole.
In the technical scheme, the plurality of first stator punching sheets are overlapped together to form a first punching sheet, a circumferentially extending communicating recess is formed in the inner peripheral wall of the first punching sheet, the plurality of second stator punching sheets are overlapped together to form a second punching sheet, then at least one first punching sheet and at least one punching sheet are butted and overlapped, and the purpose of reducing the vibration noise of the motor can be achieved.
In any of the above solutions, further, the inner wall surface includes an arc line and/or a straight line segment in a direction perpendicular to the axis of the rotor.
In this technical solution, along a direction perpendicular to an axis of the rotor, that is, on a radial cross section of the inner hole, an inner wall surface of the recess portion is composed of a straight line segment and/or an arc segment, for example, the inner wall surface may be in an arc shape, may also be composed of a plurality of straight line segments, or may also be composed of a combination of an arc segment and a straight line segment. Thereby being beneficial to reducing parameters such as inductance of the motor and the like, and further improving the energy efficiency of the motor.
In any of the above technical solutions, further, two adjacent stator teeth are surrounded to form a stator slot, and a slot opening of the stator slot is formed between the tooth shoes of the two adjacent stator teeth.
In the technical scheme, stator slots forming a sector structure are surrounded by two adjacent stator teeth, and a slot opening of each stator slot is formed between the tooth shoes of the two adjacent stator teeth, namely the slot opening of each stator slot is formed between the first tooth shoe part of each stator tooth and the second tooth shoe part of the adjacent stator tooth of the corresponding stator tooth.
According to a second aspect of the present invention, a stator is provided, which includes the stator core provided in any one of the first aspects, and therefore, the stator provided in any one of the first aspects has all the advantages of the stator core provided in any one of the first aspects, which are not listed here.
In the above technical solution, further, the stator further includes: and the winding is wound on the tooth part of the stator core.
In this technical scheme, a plurality of tooth portions distribute uniformly along stator core's circumference, the winding is around establishing on stator core's tooth portion, make the winding produce even magnetic field when switching on to the winding, simultaneously, stator core's tooth boots can play the effect that prevents the coil and drop, make the rotor can not have the skew rotation axis's of barycenter the condition at the rotation in-process, in order to maintain the dynamic balance of motor, reduce the phenomenon of bearing structure's local wear aggravation, ensure that motor structure is more firm.
Further, when the stator is applied to the motor, the windings are arranged into concentrated windings, so that the polarities of two adjacent groups of windings are the same, and due to the principle that like poles repel each other, the magnetic field formed by the stator windings returns through the adjacent salient poles to form a closed magnetic circuit. And the number of the coils can be set to be 9 or 12 according to actual conditions and use requirements.
According to a third aspect of the present invention, a permanent magnet synchronous motor is provided, which has the stator provided in any one of the second aspects, and therefore, the permanent magnet synchronous motor provided in the technical solution of the present invention has all the beneficial effects of the stator provided in any one of the second aspects, which are not listed here.
In the above technical solution, further, the permanent magnet synchronous motor further includes: and the rotor is arranged in the inner hole of the stator.
In this technical scheme, the rotor wears to locate the downthehole of stator to be provided with air gap between stator and rotor, in order to guarantee that the rotor can be at the inside free rotation of stator.
Specifically, the rotor includes rotor core and permanent magnet, forms the magnetic pole with the permanent magnet setting in rotor core's mounting groove, makes the permanent magnet can receive the magnetic field influence that the stator circular telegram produced, moves under the effect of magnetic field power. The permanent magnet comprises a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet surround to form a V-shaped structure, and the magnetic gathering effect generated by a V-shaped magnetic pole formed by the V-shaped permanent magnet is favorable for improving the counter electromotive force of the permanent magnet synchronous motor, so that the low-frequency energy efficiency of compression is favorably improved. It will be appreciated that the permanent magnets may also be other shapes that meet the requirements. The permanent magnet synchronous motor has the advantages that the outer diameter of the rotor is reduced, the permanent magnet excitation of the rotor is not reduced, the line load of the permanent magnet synchronous motor is increased, the maintenance of the magnetic load of the permanent magnet synchronous motor is ensured, the power density of the permanent magnet synchronous motor is increased, and the material utilization rate is improved.
In the above technical solution, further, the diameter of the inner hole of the stator is Di, the rated torque of the permanent magnet synchronous motor is T, and the unit volume torque of the rotor is TPV, which satisfy the following relational expression: 5.18X 10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 TPV is more than or equal to 5 and less than or equal to 45; wherein the rated torque T of the permanent magnet synchronous motor is expressed in the unit of N.m, the inner diameter Di of the stator core is expressed in the unit of mm, and the unit volume torque TPV of the rotor is expressed in the unit of kN.m.m -3 。
In the technical scheme, the rated torque of the permanent magnet synchronous motor is T, the diameter of an inner hole of the stator, namely the inner diameter of a stator iron core is Di, the unit volume torque of the rotor is TPV, and the requirement of 5.18 multiplied by 10 is met -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 The value range of the unit volume torque TPV is 5 kN.m.m -3 ≤TPV≤45kN·m·m -3 By definingThe value range of the combination variable of the rated torque T of the magnetic synchronous motor, the diameter Di of the inner hole and the unit volume torque TPV of the rotor enables the motor to meet the power requirement of the compressor, and in addition, the magnetic leakage of the rotor can be effectively reduced, the utilization rate of the permanent magnet is increased, and the efficiency of the permanent magnet synchronous motor is improved.
A fourth aspect of the present invention provides a compressor having the stator according to any one of the second aspect or the permanent magnet synchronous motor according to any one of the third aspect, and therefore the power generation apparatus according to any one of the present invention has all the advantages of the stator according to any one of the second aspect or the permanent magnet synchronous motor according to any one of the third aspect, which are not listed here.
A fifth aspect of the present invention provides a refrigeration apparatus, which has the stator provided in any one of the second aspect, the permanent magnet synchronous motor in any one of the third aspect, or the compressor in any one of the fourth aspect, and therefore, the refrigeration apparatus provided in any one of the aspects of the present invention has all the advantages of the stator provided in any one of the second aspect, the permanent magnet synchronous motor in any one of the third aspect, or the compressor in any one of the fourth aspect, which are not listed here.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of a first stator lamination according to an embodiment of the invention;
FIG. 2 shows an enlarged view of area A of FIG. 1;
FIG. 3 is a schematic view of the stator and rotor structure of one embodiment of the present invention;
FIG. 4 shows an enlarged view of area B of FIG. 3;
fig. 5 shows a schematic view of a compressor according to an embodiment of the present invention.
The reference numbers indicate:
100 first stator laminations, 110 stator teeth, 112 teeth, 114 tooth shoes, 116 inner circumferential wall, 120 inner bore, 130 stator slots, 1140 depressions, 1142 inner wall surface, 1144 first tooth shoes, 1146 second tooth shoes, 300 compressor, 310 stator, 320 rotor, 330 crankshaft, 340 main bearing, 350 cylinder, 360 piston, 370 secondary bearing.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A stator core, a stator, a permanent magnet synchronous motor, a compressor, and a refrigeration apparatus according to some embodiments of the present invention will be described below with reference to fig. 1 to 5.
Example 1:
as shown in fig. 1, according to an embodiment of the present invention, there is provided a stator core including: a plurality of stator laminations.
Specifically, each stator lamination includes a plurality of stator teeth 110 distributed along the circumferential direction, and each stator tooth 110 includes: the stator core comprises a tooth part 112 and tooth shoes 114, wherein the tooth shoes 114 are arranged on one side of the tooth part 112 close to an inner hole 120, the inner hole 120 is formed by a plurality of the tooth shoes 114 in a surrounding mode, and a plurality of stator punching sheets are arranged in a stacking mode along the axial direction of the inner hole 120. The plurality of stator laminations comprise at least one first stator lamination 100, the inner peripheral wall 116 of at least one tooth shoe 114 of the first stator lamination 100 is provided with a recessed portion 1140, the tooth shoe 114 comprises a first tooth shoe portion 1144, and part of the recessed portion 1140 is located in a region of one side, facing the first tooth shoe portion 1144, of the symmetry center line d of the tooth portion 112.
In the embodiment, the vibration deformation generated by the stator core due to the radial component is a main source of electromagnetic noise, and the concave part 1140 is formed in the stator punching sheet, so that the suppression of the harmonic wave of the air gap magnetic field is facilitated, the radial electromagnetic force wave generated by the interaction of the armature magnetic field harmonic wave and the rotor magnetic field harmonic wave is reduced, the deformation of the stator core is reduced, the vibration noise of the key frequency band of the motor is obviously improved, and the hearing of the compressor is effectively improved. Meanwhile, by providing the first tooth shoe 1144, the back electromotive force is advantageously enhanced, and the manufacturability of the motor can be improved.
The number of the stator teeth 110 is generally a multiple of 3, and may be 6, 9, 12, or 18, and the like, and may be selected according to specific requirements of the motor in actual application, which is not illustrated.
Specifically, the periphery wall of the stator core is approximately cylindrical, so that the installation of the stator core is facilitated on one hand, and the production and processing of the stator core are facilitated on the other hand.
Further, two adjacent stator teeth 110 are surrounded to form a stator slot 130, and a slot opening of the stator slot 130 is formed between the tooth shoes 114 of the two adjacent stator teeth 110. The width of the notch is 2-4 mm, the magnetic field distribution of the stator teeth 110 is changed through the size of the notch, the magnetic density is further changed, the output torque of the motor is improved, and the efficiency of the motor is improved.
It can be understood that the plurality of stator laminations of the stator core may be formed by stacking the first stator laminations 100, all the stator teeth 110 on the first stator laminations 100 may be provided with the recessed portions 1140, and some of the stator teeth 110 may also be provided with the recessed portions 1140, which is beneficial to increase the air gap between the stator and the rotor; the stator lamination structure can also be formed by alternately stacking at least two types of stator laminations comprising the first stator lamination 100, namely, part of the stator laminations are provided with the recessed portions 1140, even if the corresponding relationship between the outer periphery of the rotor of the motor and the inner periphery of the stator of the motor is point-to-point, the order of the radial electromagnetic force wave can be improved by improving the stator slots 130, the lowest spatial order component of the radial electromagnetic force wave is further reduced, the low-frequency energy efficiency of the motor is improved, and the mass production manufacturability is improved.
Example 2:
as shown in fig. 1 to 3, according to an embodiment of the present invention, including the features defined in any of the above embodiments, and further: in a cross section perpendicular to the axis of the rotor 320, the shortest distance from any point on the inner wall surface 1142 of the rotor 320 to the rotation center of the rotor 320 is gradually reduced toward the recess 112 in the rotation direction of the rotor 320.
In this embodiment, the rotor 320 is inserted into the inner hole 120 of the stator core, and on a cross section perpendicular to the axis of the rotor 320, the shortest distance from the recess 112 to the rotation center of the rotor 320 gradually decreases toward any point on the inner wall surface 1142 of the rotor 320 along the rotation direction of the rotor 320. That is, the minimum distance between two adjacent points on inner wall surface 1142 and the rotation center of rotor 320 is different. Therefore, by optimizing the size of the recess 1140, the air gap magnetic field harmonic and the radial electromagnetic force wave are further reduced to reduce the electromagnetic noise, and meanwhile, the recess 1140 is prevented from causing the magnetic resistance to increase and affecting the operation efficiency of the motor due to the fact that the air gap generated by the radial oversize is too large, and is prevented from causing the air gap harmonic magnetic field to increase and electrode loss and noise to increase due to the fact that the air gap is too small.
Specifically, the inner wall surface 1142 of the recess 1140 includes an arc line and/or a straight line segment in a direction perpendicular to the axis of the rotor 320, that is, the inner wall surface 1142 is composed of a straight line segment and/or a circular arc segment. For example, the inner wall surface 1142 may be arc-shaped, may be formed by multiple straight line segments, or may be formed by a combination of arc segments and straight line segments. Thereby being beneficial to reducing parameters such as inductance of the motor and the like, and further improving the energy efficiency of the motor. And fillet transition is adopted at the included angle of the concave part 1140, so that the preparation is convenient.
Example 3:
as shown in fig. 1 to 3, according to an embodiment of the present invention, including the features defined in any of the embodiments above, and further: the tooth shoe 114 further includes: a second tooth shoe 1146.
In detail, in the rotation direction of the rotor 320, the second tooth shoe 1146 is disposed in a region of a side of the symmetric center line d of the tooth portion 112 facing away from the first tooth shoe 1144, and the second tooth shoe 1146 is provided with the recess 1140.
Wherein the first tooth shoe 1144 and the second tooth shoe 1146 are portions of the tooth shoe 114 extending toward two adjacent stator slots, respectively.
In this embodiment, a first tooth shoe 1144 and a second tooth shoe 1146 are respectively disposed on both sides of a symmetrical center line d of the tooth portion 112 in the rotation direction of the rotor 320, that is, the tooth shoe 114 includes the first tooth shoe 1144 and the second tooth shoe 1146 in turn in the rotation direction of the rotor 320. The second tooth shoe 1146 is provided with a recess 1140, so that an air gap between the second tooth shoe 1146 and the rotor 320 is changed, thereby improving low-order force waves and further improving vibration noise of a critical frequency band of the motor.
Example 4:
as shown in fig. 3 and 4, according to an embodiment of the invention, including the features defined in any of the embodiments above, and further: in the radial direction of the inner hole 120, a first connecting length d1 of the recess 1140 between both end points on the inner peripheral wall 116 is greater than one-half of a second connecting length d2 between both end points of the inner peripheral wall 116.
In this embodiment, in a cross section of the first stator lamination 100 along the radial direction of the inner hole 120, a first connecting line length d1 between two end points of the concave portion 1140 on the inner circumferential wall 116 is greater than one half of a second connecting line length d2 between two end points of the inner circumferential wall 116 (d 1 > 1/2 × d 2), that is, the area occupied by the concave portion 1140 on the inner circumferential wall 116 of the single tooth shoe is greater than the area occupied by the non-concave portion 1140. Therefore, by optimizing the size of the recess 1140, an optimal gap is kept between the stator teeth 110 and the magnetic poles of the rotor, and the radial electromagnetic force wave is reduced to the maximum extent, so that the air gap reluctance between the stator teeth 110 and the magnetic poles of the rotor is changed, the 'cogging effect' is improved, the deformation of a stator core is reduced, the electromagnetic leakage is prevented, and the aims of reducing vibration and reducing noise generated in the operation process of the brushless direct current motor are fulfilled.
Example 5:
according to an embodiment of the invention, including the features defined in any of the embodiments above, and further: the plurality of stator laminations further comprise at least one second stator lamination; along the axial of hole, the thickness of first stator punching and second stator punching is L1 and L2 respectively, satisfies following relational expression: L2/L1 is more than or equal to 0.001 and less than or equal to 0.6.
In this embodiment, the plurality of stator punching sheets further include at least one second stator punching sheet, that is, the stator core includes stator punching sheets of two different structures, and the adoption of two punching sheet structures is favorable to improving the low frequency energy efficiency of the motor and is taken into account in improving the mass production manufacturability. Along the axial of hole, also be the direction of piling up of a plurality of stator punching, the thickness L1 of whole first stator punching in a plurality of stator punching and the thickness L2 of whole second stator punching in a plurality of stator punching satisfy following relational expression: L2/L1 is more than or equal to 0.001 and less than or equal to 0.6. Thereby assemble according to different axial thickness through optimizing two kinds of stator towards the piece, inject the quantity that first stator is towards the piece and be greater than the quantity of second stator towards the piece, promote the shared space of depressed part to compromise motor vibration noise and efficiency, the at utmost satisfies user's user demand.
The thicker the first stator punching sheet L1 is, the better the noise improvement effect is, the thicker the second stator punching sheet L2 is, the smaller the occupied space of the concave part is, the higher the motor energy efficiency is, and the two punching sheets can be assembled according to actual needs.
It can be understood that, as the stator punching sheet of the same stator core, the first stator punching sheet and the second stator punching sheet have the same shape and size, and the difference lies in that the first stator punching sheet is provided with the depressed part. Wherein, the thickness of the stator punching sheet is 0.2 mm-0.5 mm.
Example 6:
according to an embodiment of the invention, including the features defined in any of the above embodiments, and further: the stacking mode of the first stator punching sheet and the second stator punching sheet comprises the following modes:
in the first mode, the first stator punching sheet and the second stator punching sheet are alternately stacked along the axial direction of the inner hole.
In this embodiment, the first stator laminations and the second stator laminations are randomly and alternately stacked, as long as the number of the second stator laminations is smaller than that of the first stator laminations. The stator and the rotor are beneficial to lifting the gap between the stator and the rotor, so that the radial electromagnetic wave generated by the interaction of the armature magnetic field harmonic wave and the rotor magnetic field harmonic wave is reduced, the deformation of a stator core is reduced, the vibration noise of a key frequency band of a motor is obviously improved, and the hearing of a compressor is effectively improved.
And in the second mode, the plurality of first stator punching sheets are continuously stacked to form a first punching section, the plurality of second stator punching sheets are continuously stacked to form a second punching section, and the first punching section and the second punching section are alternately stacked along the axial direction of the inner hole.
In the embodiment, a plurality of first stator punching sheets are overlapped to form a first punching sheet, so that a communication recess extending axially is formed in the inner peripheral wall of the first punching sheet, a plurality of second stator punching sheets are overlapped to form a second punching sheet, and then at least one first punching sheet and at least one punching sheet are overlapped in a butt joint mode. Therefore, the gap between the stator and the rotor can be enlarged, the air gap magnetic resistance between the stator teeth and the rotor magnetic poles is changed, and the purpose of reducing the vibration noise of the motor can be achieved while the performance of the motor is ensured.
It can be understood that at least one first punching segment can also be superimposed on at least one second stator punching.
Further, air gaps between the depressed parts of different first stator punching sheets and the rotor can be the same or different in the radial direction of the inner hole. The first stator punching plates with different air gaps between the plurality of depressed parts and the rotor are axially assembled, namely on the cross section of the inner hole passing through the axis, the axially extending communication depressions formed on the inner peripheral walls of the plurality of first punching plate sections are wavy. Thereby being beneficial to changing the occupied space of the concave part and further improving the electronic noise. Wherein, the air gap size between depressed part and the rotor can set up rationally as required.
Example 7:
embodiments of the second aspect of the invention provide a stator, which includes the stator core provided in embodiments of the first aspect. Therefore, this embodiment provides a stator having all the advantageous effects of the stator core provided by the embodiment of the first aspect.
Further, the stator further includes: and the coil is wound on the tooth part of the stator core. A plurality of tooth portions distribute uniformly along stator core's circumference, the coil is around establishing on stator core's tooth portion, make the winding produce even magnetic field when switching on the coil, simultaneously, stator core's tooth boots can play the effect that prevents the coil and drop, make the rotor can not have the skew rotation axis's of barycenter the condition at the rotation in-process, in order to maintain the dynamic balance of motor, reduce the phenomenon of bearing structure's local wear aggravation, ensure that motor structure is more firm.
Further, when the stator is applied to the motor, the windings are arranged into concentrated windings, so that the polarities of two adjacent groups of windings are the same, and due to the principle that like poles repel each other, the magnetic field formed by the stator windings returns through the adjacent salient poles to form a closed magnetic circuit. And the number of the coils can be set to be 9 or 12 according to actual conditions and use requirements.
Example 8:
as shown in fig. 1 to 3, according to an embodiment of the present invention, there is provided a stator including: the stator core comprises a plurality of first stator punching sheets 100 and a plurality of second stator punching sheets, wherein the plurality of first stator punching sheets and the plurality of second stator punching sheets are stacked to form a stator core. The stator core is arranged outside the rotor 320 in a surrounding manner, the stator core comprises a plurality of tooth parts 112, the plurality of tooth parts 112 are arranged on one side of the stator core facing the rotor 320, the plurality of tooth parts 112 are arranged along the circumferential direction of the stator core, and a stator slot 130 is defined between every two adjacent tooth parts 112; the coil is wound around the tooth 112. The tooth section 112 is provided with a tooth shoe 114 near the side facing the rotor 320. The tooth shoe 114 of the first stator lamination 100 is provided with a recess 1140, and the structure of the second stator lamination is not limited.
The circle of the farthest end contour of the tooth shoe 114 on one side of the rotation direction of the rotor 320, which is closest to the rotation center point of the rotor 320, is defined as an auxiliary circle, the shortest distance between the tooth surface (inner peripheral wall 116) of the tooth shoe 114 of the first stator lamination 100 and the center of the auxiliary circle gradually decreases from the rotation direction of the rotor 320, and in a cross section of the first stator lamination 100 along the radial direction of the rotor 320, the ratio of the recessed portions 1140 to the inner peripheral wall 116 is greater than that of the inner peripheral wall 116 in a region of the inner peripheral wall 116 except for the recessed portions 1140.
For example, as shown in fig. 3 and 4, the first stator lamination 100 has 9 stator teeth 110, each stator tooth 110 is provided with a recess 1140, the rotation direction of the rotor 320 is counterclockwise, the tooth shoe 114 sequentially includes a first tooth shoe portion 1144 and a second tooth shoe portion 1146 along the rotation direction of the rotor 320, and on a cross section of the first stator lamination 100 along the radial direction of the rotor 320, a shortest distance between any point on the recess 1140 located on one side of the first tooth shoe portion 1144 and the center of the rotor auxiliary circle is greater than a shortest distance between any point on the recess 1140 located on the second tooth shoe portion 1146 and the center of the rotor auxiliary circle.
In the embodiment, by adopting the stator structure, the electromagnetic radial force can be reduced, the suppression of the harmonic wave of the air gap magnetic field is facilitated, the radial electromagnetic force wave generated by the interaction of the armature magnetic field harmonic wave and the rotor magnetic field harmonic wave is obviously reduced, the vibration noise of the key frequency band of the compressor is further improved, and the hearing of the compressor is effectively improved. And adopt two kinds of towards piece structures simultaneously and be favorable to improving the low frequency efficiency of motor, compromise and improve volume production manufacturability.
Further, first stator punching is L1 along motor axial thickness, and second stator punching is L2 along motor axial thickness, satisfies: L2/L1 is more than or equal to 0.001 and less than or equal to 0.6; the two stator punching sheets are assembled according to different axial thicknesses, different compressor vibration noise improvement effects can be obtained, the thicker the first stator punching sheet L1 is, the better the noise improvement effect is, the thicker the second stator punching sheet L2 is, the higher the motor energy efficiency is, and the two punching sheets can be assembled according to actual needs.
Example 9:
according to an embodiment of the third aspect of the present invention, a permanent magnet synchronous motor is provided, which has the stator provided in any embodiment of the second aspect, and therefore, the permanent magnet synchronous motor provided in an embodiment of the present invention has all the beneficial effects of the stator provided in any embodiment of the second aspect, which are not listed here.
Further, the permanent magnet synchronous motor further includes: and the rotor is arranged in the inner hole of the stator, and an air gap is formed between the rotor and the stator along the radial direction of the rotor.
In this embodiment, the rotor is disposed through the inner bore of the stator and an air gap is provided between the stator and the rotor to ensure that the rotor can rotate freely within the stator.
Specifically, the rotor includes: rotor core and permanent magnet. Specifically, the rotor core is provided with a plurality of mounting grooves, which are arranged along a circumferential direction of the rotor core. The permanent magnet is arranged in the mounting groove to form a magnetic pole, so that the permanent magnet can be influenced by a magnetic field generated after the stator is electrified and moves under the action of the magnetic force, and the rotor is driven to rotate to realize the output of the permanent magnet synchronous motor.
The permanent magnet comprises a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet are surrounded to form a V-shaped structure, and the magnetic gathering effect generated by a V-shaped magnetic pole formed by the V-shaped permanent magnet is beneficial to improving the counter electromotive force of the permanent magnet synchronous motor, so that the low-frequency energy efficiency of compression is improved. It will be appreciated that the permanent magnets may also be other shapes that meet the requirements. The permanent magnet synchronous motor has the advantages that the outer diameter of the rotor is reduced, the permanent magnet excitation of the rotor is not reduced, the line load of the permanent magnet synchronous motor is increased, the maintenance of the magnetic load of the permanent magnet synchronous motor is ensured, the power density of the permanent magnet synchronous motor is increased, and the material utilization rate is improved. The air gap is 0.4mm or more and 0.8mm or less.
Certainly, the permanent magnet can also set up to U type structure, and the permanent magnet can comprise two parts this moment, can set up the U-shaped mounting groove on setting up stator core, and the magnetic effect that gathers that the U-shaped magnetic pole that the U-shaped permanent magnet formed also can produce is favorable to promoting PMSM back emf, and then is favorable to promoting PMSM's low frequency efficiency.
Further, the diameter of an inner hole of the stator is Di, the rated torque of the permanent magnet synchronous motor is T, the unit volume torque of the rotor is TPV, and the following relational expression is satisfied: 5.18X 10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 TPV is more than or equal to 5 and less than or equal to 45; wherein the rated torque T of the permanent magnet synchronous motor is expressed in the unit of N.m, the inner diameter Di of the stator core is expressed in the unit of mm, and the unit volume torque TPV of the rotor is expressed in the unit of kN.m.m -3 . Thereby through the value range of the combination variable who has injectd PMSM's rated torque T, the diameter Di of hole and the unit volume torque TPV of rotor for this PMSM can satisfy the power demand of compressor, and in addition, to PMSM and the compressor that adopts this rotor, can effectively reduce the rotor magnetic leakage, increase the permanent magnet utilization ratio, promote PMSM efficiency.
Example 10:
as shown in fig. 5, according to a fourth aspect of the present invention, there is provided a compressor 300 having the stator 310 provided in any one of the embodiments of the second aspect, or the permanent magnet synchronous motor provided in any one of the embodiments of the third aspect, so that the power generation apparatus provided in any one of the embodiments of the present invention has all the advantages of the stator 310 provided in any one of the embodiments of the second aspect or the permanent magnet synchronous motor provided in any one of the embodiments of the third aspect, which are not listed here.
Further, the compressor 300 further includes: a crankshaft 330 and a power unit (not shown), the crankshaft 330 is inserted into the rotor core of the rotor 320 and connected to the rotor core. The power portion is connected with the axle, and the bent axle 330 is connected rotor core and power portion promptly, and then can drive bent axle 330 and rotate and then drive rotor core and rotate at the power portion during operation. Specifically, the crankshaft 330 of the compressor 300 is connected to the rotor core through the center hole of the rotor core.
Specifically, the compressor 300 further includes a main bearing 340, an auxiliary bearing 370, a cylinder 350, and a piston 360, wherein one end of the crankshaft 330 is inserted into the rotor 320, and the other end thereof sequentially passes through the main bearing 340, the cylinder 350, and the auxiliary bearing 370.
Example 11:
a fifth aspect of the present invention provides a refrigeration apparatus, which has the stator provided in any embodiment of the second aspect, or the permanent magnet synchronous motor provided in any embodiment of the third aspect, or the compressor provided in any embodiment of the fourth aspect, and therefore, embodiments of the present invention provide all the advantages of the stator provided in any embodiment of the second aspect, or the permanent magnet synchronous motor provided in any embodiment of the third aspect, or the compressor provided in any embodiment of the fourth aspect, which are not listed here.
In the description of the present specification, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless otherwise explicitly stated or defined; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A stator core, stator core includes the hole, its characterized in that, stator core still includes:
the stator punching sheets are stacked along the axial direction of the inner hole, each stator punching sheet comprises a plurality of stator teeth distributed along the circumferential direction, each stator tooth comprises a tooth part and a tooth shoe connected to the tooth part, and the tooth shoes are arranged in an enclosing manner to form the inner hole;
the stator laminations comprise at least one first stator lamination, and the inner peripheral wall of at least one tooth shoe of the first stator lamination is provided with a concave part;
the tooth shoe of the first stator punching sheet sequentially consists of a first tooth shoe part and a second tooth shoe part along the rotation direction of the rotor, the first tooth shoe part and the second tooth shoe part are arranged on two sides of the symmetrical center line of the tooth part, and the concave part is arranged in a partial region from the inner peripheral wall of the second tooth shoe part to the inner peripheral wall of the first tooth shoe part along the reverse direction of the rotation direction of the rotor;
a rotor is arranged in the inner hole, and on a section perpendicular to the axis of the rotor, the shortest distance from any point on the inner wall surface of the recessed part towards the rotor to the rotation center of the rotor is gradually reduced along the rotation direction of the rotor;
the inner wall surface of the concave part comprises an arc line and/or a straight line segment;
the plurality of stator laminations further comprise at least one second stator lamination;
the number of the first stator punching sheets is larger than that of the second stator punching sheets.
2. The stator core according to claim 1,
on the radial section of the first stator punching sheet along the inner hole, the length of a first connecting line between two end points of the concave part on the inner peripheral wall is larger than one half of the length of a second connecting line between the two end points of the inner peripheral wall.
3. The stator core according to claim 1,
along the axial direction of the inner hole, the thicknesses of the first stator punching sheet and the second stator punching sheet are respectively L1 and L2, and the following relational expression is satisfied: L2/L1 is more than or equal to 0.001 and less than or equal to 0.6.
4. The stator core according to claim 3,
the first stator punching sheet and the second stator punching sheet are alternately stacked along the axial direction of the inner hole.
5. The stator core according to claim 3,
the plurality of first stator punching sheets are continuously stacked to form first punching sheets, the plurality of second stator punching sheets are continuously stacked to form second punching sheets, and the first punching sheets and the second punching sheets are alternately stacked along the axial direction of the inner hole.
6. The stator core according to any one of claims 1 to 5,
the inner wall surface includes an arc line and/or a straight line segment in a direction perpendicular to an axis of the rotor.
7. A stator, comprising:
a stator core according to any one of claims 1 to 6.
8. The stator of claim 7, further comprising:
and the winding is wound on the tooth part of the stator core.
9. A permanent magnet synchronous motor, comprising:
a stator as claimed in claim 7 or 8.
10. The permanent magnet synchronous motor according to claim 9, further comprising:
and the rotor is arranged in the inner hole of the stator.
11. The permanent magnet synchronous motor according to claim 10,
the diameter of the inner bore of the stator is Di,the rated torque of the permanent magnet synchronous motor is T, the unit volume torque of the rotor is TPV, and the following relational expression is satisfied: 5.18X 10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 ，5≤TPV≤45；
The unit of rated torque T of the permanent magnet synchronous motor is N.m, the unit of inner diameter Di of the stator core is mm, and the unit of unit volume torque TPV of the rotor is kN.m.m -3 。
12. A compressor, comprising:
the stator of claim 7 or 8; or
A permanent magnet synchronous machine according to any of claims 9 to 11.
13. A refrigeration apparatus, comprising:
the stator of claim 7 or 8; or
A permanent magnet synchronous machine according to any one of claims 9 to 11; or
The compressor of claim 12.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011376813.2A CN112583143B (en) | 2020-11-30 | 2020-11-30 | Stator core, stator, permanent magnet synchronous motor, compressor and refrigeration equipment |
| PCT/CN2020/134990 WO2022110311A1 (en) | 2020-11-30 | 2020-12-09 | Stator core, stator, permanent-magnet synchronous motor, compressor, and refrigeration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011376813.2A CN112583143B (en) | 2020-11-30 | 2020-11-30 | Stator core, stator, permanent magnet synchronous motor, compressor and refrigeration equipment |
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| Publication Number | Publication Date |
|---|---|
| CN112583143A CN112583143A (en) | 2021-03-30 |
| CN112583143B true CN112583143B (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011376813.2A Active CN112583143B (en) | 2020-11-30 | 2020-11-30 | Stator core, stator, permanent magnet synchronous motor, compressor and refrigeration equipment |
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| Country | Link |
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| CN (1) | CN112583143B (en) |
| WO (1) | WO2022110311A1 (en) |
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| CN113162261A (en) * | 2021-04-16 | 2021-07-23 | 安徽美芝精密制造有限公司 | Stator punching sheet, motor, compressor and household appliance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005051841A (en) * | 2003-07-30 | 2005-02-24 | Hitachi Ltd | Motor, compressor, and air conditioner |
| JP2008178258A (en) * | 2007-01-19 | 2008-07-31 | Sumitomo Electric Ind Ltd | Stator core |
| JP2013027240A (en) * | 2011-07-25 | 2013-02-04 | Daikin Ind Ltd | Rotary electric machine |
| CN202696296U (en) * | 2012-06-14 | 2013-01-23 | 珠海格力电器股份有限公司 | Bias air gap stator punching sheet and stator core |
| CN208190359U (en) * | 2018-05-30 | 2018-12-04 | 广东威灵电机制造有限公司 | Stator core and rotating electric machine |
| CN109660034A (en) * | 2019-01-29 | 2019-04-19 | 艾博金电气制造（深圳）有限公司 | Magnetic core and motor with the magnetic core |
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2020
- 2020-11-30 CN CN202011376813.2A patent/CN112583143B/en active Active
- 2020-12-09 WO PCT/CN2020/134990 patent/WO2022110311A1/en active Application Filing
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| CN112583143A (en) | 2021-03-30 |
| WO2022110311A1 (en) | 2022-06-02 |
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