CN112564320A - 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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- CN112564320A CN112564320A CN202011415697.0A CN202011415697A CN112564320A CN 112564320 A CN112564320 A CN 112564320A CN 202011415697 A CN202011415697 A CN 202011415697A CN 112564320 A CN112564320 A CN 112564320A
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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 the stator core comprises: the stator inner hole is used for penetrating the rotor; the stator punching sheet comprises a stator yoke and a plurality of stator teeth distributed along the circumferential direction of the stator yoke; the stator tooth includes: a tooth root connected with the stator yoke; a crown connected to an end of the root facing away from the stator yoke; wherein, every stator punching has along the axial thickness of stator hole, is provided with the magnetic conductance through-hole on at least one tooth crown on at least one stator punching, along the axial of tooth root, the projection of magnetic conductance through-hole on the tooth crown is separated the tooth crown for first tooth crown face and second tooth crown face, and the area of first tooth crown face is less than the area of second tooth crown face. According to the embodiment of the invention, the vibration noise of the key frequency band of the motor can be obviously improved, and the hearing of the motor and the compressor is improved.
Description
The present application claims priority from a chinese patent application entitled "stator core, stator, permanent magnet synchronous motor, compressor, and refrigeration equipment" filed at 30.11.2020 to the chinese intellectual property office under the application number "202011376512. X," the entire contents of which are incorporated herein by reference.
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 high power density, after the motor is electrified, a stator magnetic field and a rotor magnetic field interact with each other to generate a synthetic magnetic field, so that vibration noise is generated.
How to deal with the vibration noise caused by the synthetic magnetic field to improve the hearing is an urgent technical problem to be solved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of 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 proposes a stator.
A third aspect of the invention proposes a permanent magnet synchronous machine.
A fourth aspect of the present invention provides a compressor.
A fifth aspect of the present invention proposes a refrigeration apparatus.
In view of this, a first aspect of the present invention provides a stator core including: the stator inner hole is used for penetrating the rotor; the stator punching sheet comprises a stator yoke and a plurality of stator teeth distributed along the circumferential direction of the stator yoke; the stator tooth includes: a tooth root connected with the stator yoke; a crown connected to an end of the root facing away from the stator yoke; wherein, every stator punching has along the axial thickness of stator hole, is provided with the magnetic conductance through-hole on at least one tooth crown on at least one stator punching, along the axial of tooth root, the projection of magnetic conductance through-hole on the tooth crown is separated the tooth crown for first tooth crown face and second tooth crown face, and the area of first tooth crown face is less than the area of second tooth crown face.
In this technical scheme, be provided with the stator hole in the stator core, the rotor of motor can wear to establish in the stator hole to at the internal rotation of stator hole. Stator core includes the stator punching sheet, is provided with a plurality of stator teeth towards the stator hole on the stator punching sheet, and the stator tooth includes tooth root and tooth crown, and a plurality of stator teeth distribute the setting in stator punching sheet's interior circumference for a plurality of tooth crowns enclose each other and establish, constitute for above-mentioned stator hole.
Wherein, on the tooth crown, on the axial direction along the rotor, still seted up the magnetic conductance through-hole, the axis in "hole" of magnetic conductance through-hole is parallel with the axis of stator hole, and can not direct intercommunication between magnetic conductance through-hole and the stator hole, that is to say, the magnetic conductance hole can not run through the tooth crown towards the surface of stator hole one side, is "punch" in the footpath of stator punching.
Because the radial component makes the vibration deformation that stator core produced be the main source of electromagnetic noise, therefore radially offering the magnetic conductance through-hole along the stator punching, the vibration deformation that can effectual "offset" stator core produced reduces the radial electromagnetic force wave that produces when armature magnetic field harmonic and rotor harmonic act on mutually, thereby reduces the stator punching and the type variable of whole stator core, can prevent electromagnetic leakage simultaneously.
Along the axial of tooth root, the projection of magnetic conductance through-hole on the tooth crown is separated the surface that the tooth crown deviates from the tooth root for first tooth crown face and second tooth crown face, and the area of first tooth crown face is less than the area of second tooth crown face.
Specifically, the surface of the tooth crown departing from the tooth root is divided into a first tooth crown surface and a second tooth crown surface according to the intersection of the extension line of the side wall of the magnetic conduction through hole and the surface of the tooth crown facing the inner control of the stator and the area between the two ends of the tooth crown. The area of the first crown surface is larger than that of the second crown surface, namely the magnetic conduction through hole is not arranged in the middle of the crown.
Through setting up "the positive centre" that the magnetic conductance through-hole is not located the crown of tooth, be favorable to restraining the motor operation, the even harmonic in armature magnetic field can be showing and reduce the radial electromagnetic wave that armature magnetic field harmonic and rotor magnetic field harmonic produced mutually, and then improve the motor or the compressor that have used this stator core, at the vibration noise of key frequency channel, effectively improve the compressor sense of hearing.
By applying the embodiment provided by the invention, the magnetic conduction through holes are arranged on the stator teeth, so that the radial electromagnetic wave generated when the armature magnetic field harmonic wave and the rotor harmonic wave act can be reduced, the even harmonic wave of the armature magnetic field can be inhibited, the stator punching sheet and the type variable of the whole stator iron core are reduced, the vibration noise of the key frequency band of the motor can be obviously improved, and the hearing of the motor and the compressor can be improved.
In addition, the stator core in the above technical solution provided by the present invention may further have the following additional technical features:
in above-mentioned technical scheme, stator punching's quantity of setting is a plurality of, and a plurality of stator punching include: at least one first stator punching sheet; the stator punching sheet comprises at least one second stator punching sheet, wherein the first stator punching sheet and the second stator punching sheet are stacked along the axial direction of a stator inner hole, and a magnetic conduction through hole is formed in the second stator punching sheet.
In this technical scheme, the stator core of motor includes a plurality of stator punching that pile up the setting, and wherein, a plurality of stator punching are including at least one first stator punching and at least one second stator punching. The first stator punching sheet and the second stator punching sheet are stacked along the axial direction of the inner hole of the stator.
Specifically, the first stator punching sheets, the second stator punching sheets and the first stator punching sheets can be stacked at intervals, a plurality of first stator punching sheets can be stacked, a plurality of second stator punching sheets can be stacked, and the second stator punching sheets can be stacked in an out-of-order manner. The embodiment of the invention does not limit the stacking mode of the first stator punching sheet and the second stator punching sheet.
The second stator punching sheet is provided with the magnetic conduction through hole, and the first stator punching sheet is not provided with the magnetic conduction through hole. That is, the magnetic conduction through holes are formed in one part of the stator punching sheets, and the magnetic conduction through holes are formed in the upper parts of the other part of the stator punching sheets.
Adopt two kinds of stator punching sheet structures simultaneously, also be first stator punching sheet and second stator punching sheet, be favorable to improving the low frequency efficiency of motor, can reduce the production technology degree of difficulty simultaneously, be favorable to improving the yields of product and reduction product cost.
In any of the above technical solutions, along the axial direction of the stator inner hole, the stacking height of the first stator lamination is a first height, the stacking height of the second stator lamination is a second height, wherein a ratio of the first height to the second height is greater than or equal to 0.001, and the ratio is less than or equal to 0.9.
In this technical scheme, 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. Along the axial of shaft hole, also be the direction of piling up of a plurality of stator punching, the height L1 that piles up of all first stator punching in a plurality of stator punching and the height L2 that piles up of all 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 0.9.
Through optimizing the butt joint mode of two kinds of stator punching sheets for two kinds of stator punching sheets are assembled according to different axial thickness, specifically for the mode that the quantity of injecing first stator punching sheet is greater than the quantity of second stator punching sheet, are favorable to promoting the space volume of magnetic conductance recess, reduce the vibration noise of motor on the terminal frequency on the one hand, and on the other hand can compromise the operation efficiency of motor.
As can be understood, as the stator punching sheet of the same stator core, the shape and the size of the first stator punching sheet and the second stator punching sheet are the same.
In any one of the above technical solutions, the first stator punching sheet and the second stator punching sheet are alternately stacked along the axial direction of the inner hole of the stator.
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 larger than that of the first stator punching sheets. Specifically, the second stator is stamped and is provided with the magnetism isolating groove, and consequently the second stator is stamped the quantity more, and noise reduction is better, and consequently it is favorable to promoting the clearance between stator and the rotor to set up more second stator punching to reduce armature magnetic field harmonic and the produced radial electromagnetic force wave of rotor magnetic field harmonic looks effect, reduce stator core's deformation, and then prevent electromagnetic leakage, show the vibration noise who improves the motor key frequency channel, effectively improve compressor hearing.
In any of the above technical solutions, along the axial direction of the rotor, the plurality of first stator laminations are continuously stacked to form a first lamination segment, the plurality of second stator laminations are continuously stacked to form a second lamination segment, and the first lamination segment and the second lamination segment are alternately stacked.
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 second 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 embodiments, the flux guiding through-hole comprises at least one of: circular magnetic conductance through-hole, square magnetic conductance through-hole, trapezoidal magnetic conductance through-hole.
In this technical scheme, the magnetic conductance through-hole includes circular magnetic conductance through-hole, square magnetic conductance through-hole or trapezoidal magnetic conductance through-hole. It can be understood that the various magnetic conductance through holes mentioned above may be of a symmetrical structure or an asymmetrical structure, and the specific form of the magnetic conductance through holes is not limited by the embodiments of the present invention.
Through setting up the magnetic conductance through-hole of different shapes, can be to different motor parameters or rotor model to reduce the inductance isoparametric of motor, and then improve the motor efficiency.
In any one of the above technical solutions, along a radial direction of the inner hole of the stator, the inner circumferential wall of the stator punching sheet includes an arc line segment and/or a straight line segment.
In this technical scheme, along the radial of shaft hole, the internal perisporium of stator punching also includes the internal perisporium of tooth crown, can constitute by the straightway, or constitute by the circular arc section, or constitute by straightway and circular arc section concatenation again. For example, the inner circumferential wall may have a circular arc shape, may be formed of a plurality of linear segments, may have a "polygonal" shape, or may be formed of a combination of circular arc segments and linear segments. Such as in the form of a segment of a line connecting an arc of a circle. The inner circumferential wall of the stator punching sheet is set to be different in form, so that the energy efficiency of the motor is improved, the noise of the motor on key frequency bands is reduced, and the hearing of the motor is improved.
In any of the above technical solutions, at least one tooth crown on at least one stator lamination is provided with at least one through hole portion and/or at least one magnetic conductance groove, and the through hole portion and/or the magnetic conductance through hole are/is located on the first tooth crown surface.
In this technical scheme, still be provided with one or more through-hole portion on the stator punching sheet, the through-hole portion includes at least one of following: circular arc through-hole portion, square through-hole portion, trapezoidal through-hole portion, parallelogram through-hole portion.
In particular, the through-hole portion is similar or identical in shape and size to the flux guide through-hole, and therefore functions in the same way as the flux guide through-hole.
On the tooth crown, specifically in the scope of first tooth crown face, in the axial direction along the rotor, still seted up the through-hole portion, the axis of the "hole" of through-hole portion is parallel with the axis of stator hole, and can not directly communicate between through-hole portion and the stator hole, that is to say, the through-hole portion can not run through the surface of tooth crown towards stator hole one side, is "punch" in the footpath of stator punching.
In some embodiments, the magnetic conductance grooves are formed in the radial direction of the stator punching sheet, so that the vibration deformation generated by the stator core can be effectively subjected to 'opposite impact', and the radial electromagnetic force waves generated when the armature magnetic field harmonic waves and the rotor harmonic waves act in the radial direction are reduced, so that the type variables of the stator punching sheet and the whole stator core are reduced.
By applying the embodiment provided by the invention, the through hole parts and/or the magnetic conduction grooves are arranged on the stator teeth, the radial electromagnetic wave generated when the armature magnetic field harmonic wave and the rotor harmonic wave act in the opposite directions can be reduced, the even harmonic wave of the armature magnetic field can be inhibited, the stator punching sheet and the type variable of the whole stator iron core are reduced, and therefore, the vibration noise of the key frequency band of the motor can be obviously improved, and the hearing of the motor and the compressor can be improved.
A second aspect of the present invention provides a stator, where the stator includes the stator core provided in any one of the first aspect, and therefore, the stator provided in the present invention has all the beneficial effects of the stator core provided in any one of the first aspect, and in order to avoid repetition, redundant description is not repeated here.
In the above technical solution, the stator further includes: and the winding is wound on the tooth root of the stator core.
In this technical scheme, a plurality of roots are evenly distributed along stator core's circumference, the winding is around establishing on stator core's root, make the winding produce even magnetic field when switching on to the winding, simultaneously, stator core's tooth crown 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 rotating the in-process, in order to maintain the dynamic balance of motor, reduce the phenomenon that bearing structure's local wear aggravated, 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 windings can be set to 9 or 12 according to actual conditions and use requirements.
The third aspect of the present invention provides a permanent magnet synchronous motor, which includes the stator provided in any one of the above second aspect, and a rotor, wherein the rotor is inserted into the stator inner hole of the stator core. The motor comprises the stator provided in any technical scheme of the second aspect, so that the motor provided by the invention has all the beneficial effects of the stator provided in any technical scheme of the second aspect, and redundant description is not repeated herein in order to avoid repetition.
In the above technical solution, the parameters of the motor satisfy the following relational expression:
5.18×10-7≤T×Di-3×TPV-1≤1.17×10-6；
5≤TPV≤45；
wherein Di is the diameter of the inner hole of the stator, T is the rated torque of the motor, TPV is the unit volume torque of the rotor, wherein the unit of the rated torque T of the motor is N.m, the unit of the diameter Di of the inner hole of the stator is mm, and the unit volume torque TPV of the rotor is kN.m.m-3。
In this technical scheme, the rated torque of motor is T, and the diameter of stator hole, that is to say stator core's internal diameter is Di, and the unit volume torque of rotor is TPV, and satisfies:
5.18×10-7≤T×Di-3×TPV-1≤1.17×10-6；
the value range of the unit volume torque TPV is as follows: 5kN m-3≤TPV≤45kN·m·m-3The value range of the combined variable of the rated torque T of the motor, the diameter Di of the inner hole of the stator and the unit volume torque TPV of the rotor is limited, so that the motor can meet the power requirement of the compressor, and in addition, the motor and the compressor adopting the rotor can effectively reduce the magnetic leakage of the rotor, increase the utilization rate of the permanent magnet and improve the efficiency of the motor.
A fourth aspect of the present invention provides a compressor, where the compressor includes a stator according to any one of the second aspect or a permanent magnet synchronous motor according to any one of the third aspect, and therefore, the compressor includes all the beneficial effects of the stator and the permanent magnet synchronous motor according to any one of the above-mentioned aspects, and redundant description is omitted here to avoid repetition.
A fifth aspect of the present invention provides a refrigeration apparatus, where the refrigeration apparatus includes the stator according to any one of the second aspect, or the permanent magnet synchronous motor according to any one of the third aspect, or the compressor according to any one of the fourth aspect, and therefore, the refrigeration apparatus includes all the beneficial effects of the stator, the permanent magnet synchronous motor, and the compressor according to any one of the above aspects, and in order to avoid repetition, redundant description is not repeated here.
It can be understood that the refrigeration device includes different product forms such as a refrigerator, an ice chest, a freezer, a refrigerating chamber, a split air conditioner, an integrated air conditioner, a window air conditioner, a central air conditioner, an ice maker, an ice cream machine, and the like, in the embodiment of the present invention, "refrigeration device" may refer to any electrical device having a refrigeration capability, and the specific product form of the refrigeration device is not limited in the embodiment of the present invention.
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
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows one of the structural diagrams of a stator core according to an embodiment of the present invention;
fig. 2 shows a second schematic structural view of a stator core according to an embodiment of the invention;
fig. 3 shows a third schematic structural view of a stator core according to an embodiment of the present invention;
fig. 4 shows a fourth structural schematic view of a stator core according to an embodiment of the present invention;
fig. 5 shows a schematic configuration of a compressor according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 5 is:
100 first stator punching sheets;
110 stator teeth, 112 roots, 114 crowns, 120 stator bores, 130 stator slots;
1142 a flux guide through hole, 1144 a first crown surface, 1146 a second crown surface, 1148 a through hole portion, 1149 a flux guide groove;
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 and features of the embodiments of the present application 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 by the specific embodiments disclosed below.
The stator core, the stator, the motor, the compressor, and the refrigeration apparatus according to some embodiments of the present invention are described below with reference to fig. 1 to 5.
Example one
Fig. 1 shows one of the structural diagrams of a stator core according to an embodiment of the present invention, and fig. 2 shows the second structural diagram of the stator core according to an embodiment of the present invention, wherein, as shown in fig. 1 and 2, the stator core includes:
a stator bore 120 for penetrating the rotor; the stator punching sheet comprises a plurality of stator punching sheets, wherein each stator punching sheet has thickness, the plurality of stator punching sheets are stacked along the axial direction of a stator inner hole 120, and each stator punching sheet comprises a stator yoke and a plurality of stator teeth 110 distributed along the circumferential direction of the stator yoke; wherein, a magnetic conductance through hole 1142 is arranged along the thickness direction of the stator punching sheet.
In the embodiment of the present invention, a stator core is provided with a stator inner hole 120, and a rotor of the motor can be inserted into the stator inner hole 120 and rotate in the stator inner hole 120. The stator core includes the stator punching sheet, is provided with a plurality of stator teeth 110 towards stator hole 120 on the stator punching sheet, and stator teeth 110 includes tooth root 112 and tooth crown 114, and a plurality of stator teeth 110 distribute the setting in the inner periphery of stator punching sheet for a plurality of tooth crowns 114 enclose each other and establish, constitute for above-mentioned stator hole 120.
The magnetic conductance through hole 1142 is further formed in the tooth crown 114 in the axial direction of the rotor, the axis of the hole of the magnetic conductance through hole 1142 is parallel to the axis of the stator inner hole 120, and the magnetic conductance through hole 1142 is not directly communicated with the stator inner hole 120, that is, the magnetic conductance hole does not penetrate through the surface of the tooth crown 114 facing one side of the stator inner hole 120, and is "punched" in the radial direction of the stator punching sheet.
Because the radial component makes the vibration deformation that stator core produced be the main source of electromagnetic noise, therefore radially offering magnetic conductance through-hole 1142 along the stator punching, the vibration deformation that can effectual "hedging" stator core produced reduces the radial electromagnetic force wave that armature magnetic field harmonic and rotor harmonic produced when acting on mutually, thereby reduces the stator punching to and the type variable of whole stator core, can prevent electromagnetic leakage simultaneously.
By applying the embodiment provided by the invention, the magnetic conduction through holes 1142 are arranged on the stator teeth 110, so that the radial electromagnetic wave generated when the armature magnetic field harmonic wave and the rotor harmonic wave act can be reduced, the even harmonic wave of the armature magnetic field can be inhibited, the stator punching sheet and the model variables of the whole stator iron core can be reduced, the vibration noise of the key frequency band of the motor can be obviously improved, and the hearing of the motor and the compressor can be improved.
Example two
In some embodiments of the present invention, as shown in fig. 2, the stator teeth 110 include: a tooth root 112 connected with the stator yoke; a crown 114 connected to the end of the root 112 facing away from the stator yoke; wherein, every stator punching has along the axial thickness of stator hole 120, is provided with the magnetic conductance through-hole 1142 on at least one tooth crown 114 on at least one stator punching, along the axial of tooth root, the projection of magnetic conductance through-hole 1142 on the tooth crown is separated tooth crown 114 for the surface of tooth root 112, separates for first tooth crown face 1144 and second tooth crown face 1146, and first tooth crown face 1144's area is less than second tooth crown face 1146's area.
In the present embodiment, the projection of the flux guide through hole 1142 on the crown 114 along the axial direction of the tooth root divides the surface of the crown 114 facing away from the tooth root into a first crown surface 1144 and a second crown surface 1146, the area of the first crown surface 1144 being smaller than the area of the second crown surface 1146.
Specifically, the surface of the tooth crown departing from the tooth root is divided into a first tooth crown surface and a second tooth crown surface according to the intersection of the extension line of the side wall of the magnetic conduction through hole and the surface of the tooth crown facing the inner control of the stator and the area between the two ends of the tooth crown. The area of the first crown surface is larger than that of the second crown surface, namely the magnetic conduction through hole is not arranged in the middle of the crown.
As shown in fig. 2, the center of the stator bore 120 is O, and the two ends of the crown 114 and the two ends of the flux guide through hole 1142 are wired with the center of the circle being O to separate the shoe surfaces of the second crown surface. The area of the second crown surface 1146 facing the stator bore 120 is AB, and the area of the first crown surface 1144 facing the stator bore 120 is CD, AB > CD.
By arranging the magnetic conduction through hole 1142 not in the middle of the tooth crown 114, the suppression of even harmonics of the armature magnetic field during the operation of the motor is facilitated, the radial electromagnetic wave generated by the interaction of the armature magnetic field harmonics and the rotor magnetic field harmonics can be obviously reduced, the motor or the compressor using the stator core is further improved, and the auditory sense of the compressor is effectively improved due to the vibration noise of a key frequency band.
EXAMPLE III
In some embodiments of the present invention, the number of the stator laminations is multiple, and the multiple stator laminations include: at least one first stator lamination 100; at least one second stator punching sheet, first stator punching sheet 100 and second stator punching sheet stack up the setting along the axial of stator hole 120, are provided with magnetic conductance through-hole 1142 on the second stator punching sheet.
In the embodiment of the invention, the stator core of the motor comprises a plurality of stacked stator laminations, wherein the plurality of stator laminations comprise at least one first stator lamination 100 and at least one second stator lamination. The first stator lamination 100 and the second stator lamination are stacked along the axial direction of the stator inner hole 120.
Specifically, the first stator laminations 100, the second stator laminations and the first stator laminations 100 may be stacked at intervals, the plurality of first stator laminations 100 may be stacked, the plurality of second stator laminations may be stacked, and the plurality of second stator laminations may be stacked in an out-of-order manner. The embodiment of the invention does not limit the stacking manner of the first stator punching 100 and the second stator punching.
The second stator punching sheet is provided with the magnetic conductance through hole 1142, and the first stator punching sheet 100 is not provided with the magnetic conductance through hole 1142. That is, the magnetic conductance through hole 1142 is formed in a part of the stator punching sheet, and the magnetic conductance through hole 1142 is formed in the upper part of the other part of the stator punching sheet.
Meanwhile, two stator punching structures, namely the first stator punching 100 and the second stator punching, are adopted, so that the low-frequency energy efficiency of the motor is improved, the difficulty of the production process is reduced, the yield of products is improved, and the product cost is reduced.
Example four
In some embodiments of the present invention, along the axial direction of the stator inner hole 120, the stacking height of the first stator lamination 100 is a first height, and the stacking height of the second stator lamination is a second height, where a ratio of the first height to the second height is greater than or equal to 0.001, and the ratio is less than or equal to 0.9.
In the embodiment of the invention, two punching sheet structures are adopted simultaneously, so that the low-frequency energy efficiency of the motor is improved, and the mass production manufacturability is improved. Along the axial of shaft hole, also be the direction of piling up of a plurality of stator punching, the height L1 that piles up of all first stator punching 100 in a plurality of stator punching and the height L2 that piles up of all 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 0.9.
Through optimizing the butt joint mode of two kinds of stator punching sheets for two kinds of stator punching sheets are assembled according to different axial thickness, specifically for the mode that the quantity of injecing first stator punching sheet 100 is greater than the quantity of second stator punching sheet, are favorable to promoting the space volume of magnetic conductance recess, reduce the vibration noise of motor on the terminal frequency on the one hand, and on the other hand can compromise the operation efficiency of motor.
It can be understood that, as the stator laminations of the same stator core, the first stator lamination 100 and the second stator lamination have the same shape and size.
The thicker the stacking thickness L1 of the first stator punching sheet 100 is, the better the noise improvement effect is, the thicker the stacking thickness L2 of the second stator punching sheet is, the larger 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.
As can be understood, as a stator punching sheet of the same stator core, the first stator punching sheet 100 and the second stator punching sheet have the same shape and size, and the difference is that a concave portion is arranged on the first stator punching sheet 100. Wherein, the thickness of stator punching is 0.3mm to 0.5 mm.
EXAMPLE five
In some embodiments of the present invention, the first stator lamination 100 and the second stator lamination are alternately stacked along the axial direction of the stator inner hole 120.
In the embodiment of the invention, the first stator punching sheets 100 and the second stator punching sheets are randomly and alternately stacked, as long as the number of the second stator punching sheets is larger than that of the first stator punching sheets 100. Specifically, the second stator is stamped and is provided with the magnetism isolating groove, and consequently the second stator is stamped the quantity more, and noise reduction is better, and consequently it is favorable to promoting the clearance between stator and the rotor to set up more second stator punching to reduce armature magnetic field harmonic and the produced radial electromagnetic force wave of rotor magnetic field harmonic looks effect, reduce stator core's deformation, and then prevent electromagnetic leakage, show the vibration noise who improves the motor key frequency channel, effectively improve compressor hearing.
EXAMPLE six
In some embodiments of the present invention, along the axial direction of the rotor, the plurality of first stator laminations 100 are stacked continuously to form a first lamination segment, the plurality of second stator laminations are stacked continuously to form a second lamination segment, and the first lamination segment and the second lamination segment are stacked alternately.
In the embodiment of the invention, the plurality of first stator punching sheets 100 are overlapped to form the first punching sheet, so that the circumferentially extending communication recess is formed on the inner peripheral wall of the first punching sheet, the plurality of second stator punching sheets are overlapped to form the second punching sheet, and then at least one first punching sheet and at least one second punching sheet are butted and overlapped, so that the aim of reducing the vibration noise of the motor can be achieved.
It can be understood that at least one first punching segment can also be superimposed on at least one second stator punching.
EXAMPLE seven
In some embodiments of the present invention, the flux guide through-hole 1142 comprises at least one of: circular flux guide through hole 1142, square flux guide through hole 1142, trapezoidal flux guide through hole 1142.
In embodiments of the present invention, the flux guide through hole 1142 includes a circular flux guide through hole 1142, a square flux guide through hole 1142, or a trapezoidal flux guide through hole 1142. It is understood that the various magnetic conductance through holes 1142 mentioned above may be symmetrical structures or asymmetrical structures, and the specific shape of the magnetic conductance through holes 1142 is not limited in the embodiments of the present invention.
Through setting up the magnetic conductance through-hole 1142 of different shapes, can be directed against different motor parameters or rotor model to reduce the inductance isoparametric of motor, and then improve the motor efficiency.
Example eight
In some embodiments of the present invention, the inner circumferential wall of the stator lamination includes arc segments and/or straight segments in a radial direction of the stator inner bore 120.
In the embodiment of the invention, the inner peripheral wall of the stator punching sheet, including the inner peripheral wall of the tooth crown 114, in the radial direction of the shaft hole may be composed of straight line segments, or circular arc segments, or formed by splicing the straight line segments and the circular arc segments. For example, the inner circumferential wall may have a circular arc shape, may be formed of a plurality of linear segments, may have a "polygonal" shape, or may be formed of a combination of circular arc segments and linear segments. Such as in the form of a segment of a line connecting an arc of a circle. The inner circumferential wall of the stator punching sheet is set to be different in form, so that the energy efficiency of the motor is improved, the noise of the motor on key frequency bands is reduced, and the hearing of the motor is improved.
Example nine
In some embodiments of the present invention, two adjacent stator teeth 110 are surrounded to form the stator slot 130, and the tooth crowns 114 of two adjacent stator teeth 110 form a slot opening of the stator slot 130 therebetween.
The adjacent two stator teeth 110 enclose a stator slot 130 forming a sector structure, and a notch of the stator slot 130 is formed between the tooth crowns 114 of the adjacent two stator teeth 110. When the stator iron core is combined into the motor, the winding can be carried out on the tooth root 112 of the stator tooth 110 along the notch of the stator slot 130, so that the production process difficulty of the motor is favorably reduced, and the production cost is further reduced.
Example ten
In some embodiments of the present invention, fig. 3 shows a third schematic structural diagram of a stator core according to an embodiment of the present invention, and fig. 4 shows a fourth schematic structural diagram of a stator core according to an embodiment of the present invention, wherein at least one crown on at least one stator lamination is provided with at least one through hole portion 1148 and/or at least one flux guide groove 1149, and the through hole portion 1148 and/or the flux guide through hole 1142 are located on the first crown surface 1144.
In the embodiment of the present invention, as shown in fig. 3, one or more through hole portions 1148 are further disposed on the stator punching sheet, and the through hole portions 1148 include at least one of the following: circular arc-shaped through-hole portion 1148, square through-hole portion 1148, trapezoidal through-hole portion 1148, and parallelogram through-hole portion 1148.
Specifically, the through hole portion 1148 is similar or identical in shape and size to the flux guide through hole, and thus the through hole portion 1148 functions as the flux guide through hole.
On the tooth crown, specifically in the range of first tooth crown face 1144, in the axial direction along the rotor, through hole portion 1148 has been still seted up, the axis of the "hole" of through hole portion 1148 is parallel with the axis of the stator hole, and can not directly communicate between through hole portion 1148 and the stator hole, that is to say, through hole portion 1148 can not run through the surface of tooth crown towards stator hole one side, is "punch" in the footpath of stator punching.
In some embodiments, as shown in fig. 4, the magnetic conductance grooves 1149 are formed in the radial direction of the stator lamination, so that the vibration deformation generated by the stator core can be effectively "opposed", and the radial electromagnetic force waves generated when the armature magnetic field harmonics and the rotor harmonics act in the radial direction are reduced, so that the form variation of the stator lamination and the whole stator core is reduced.
By applying the embodiment provided by the invention, the through hole parts 1148 and/or the magnetic conduction grooves 1149 are/is arranged on the stator teeth 110, so that the radial electromagnetic force waves generated when the armature magnetic field harmonic waves and the rotor harmonic waves act in the same direction can be reduced, the even harmonic waves of the armature magnetic field can be inhibited, the stator punching sheets and the type variable of the whole stator iron core can be reduced, the vibration noise of the key frequency band of the motor can be obviously improved, and the hearing of the motor and the compressor can be improved.
EXAMPLE eleven
In some embodiments of the present invention, a stator is provided, where the stator includes the stator core provided in any one of the first aspect, and therefore, the stator provided in the present invention has all the beneficial effects of the stator core provided in any one of the first aspect, and in order to avoid repetition, redundant description is not repeated here.
The stator further includes: and the winding is wound on the tooth root of the stator core.
In the embodiment of the invention, the plurality of tooth roots are uniformly distributed along the circumferential direction of the stator core, the winding is wound on the tooth roots of the stator core, the winding generates a uniform magnetic field when the winding is electrified, and meanwhile, the tooth crown of the stator core can play a role in preventing the coil from falling off, so that the condition that the mass center deviates from the rotating axis does not exist in the rotating process of the rotor, the dynamic balance of the motor is maintained, the phenomenon of aggravated local wear of the supporting structure is reduced, and the motor structure is ensured to be more stable.
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 windings can be set to 9 or 12 according to actual conditions and use requirements.
Example twelve
In some embodiments of the present invention, the entire technical solution of the present application is described by combining various embodiments of the stator core and the stator described above.
Specifically, the stator comprises a stator core, and the stator core is arranged around the outside of the rotor; the tooth roots are arranged on one side, facing the rotor core, of the stator core and arranged along the circumferential direction of the stator core, and a stator slot gap is defined between every two adjacent tooth roots; the coil is wound on the tooth root, and a magnetic conduction through hole is formed in the position, close to the tooth surface, of the tooth root of the stator; the magnetic conduction through hole is not communicated with the motor air gap; the two sides of the magnetic conduction through hole in the circumferential direction correspond to a first tooth crown arc and a second tooth crown arc; the first and second crowns are not equal in circumferential area towards the rotor. By adopting the stator structure, the suppression of even harmonics of an armature magnetic field is facilitated, the radial electromagnetic wave generated by the interaction of the armature magnetic field harmonics and rotor magnetic field harmonics is obviously reduced, the vibration noise of a key frequency band of the compressor is further improved, and the hearing of the compressor is effectively improved.
In some embodiments of the present invention, a plurality of first stator laminations and a plurality of second stator laminations are stacked to form a stator core; the magnetic conduction through hole is arranged on the second stator punching sheet. 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.
In some embodiments of the invention, the second crown surface is located on the opposite side of the direction of rotation of the rotor. The second crown surface is arranged on the reverse side, so that the vibration noise of the compressor on a key frequency band can be improved, and the hearing sense of the compressor can be improved.
In some embodiments of the invention, the stacking height of the first stator punching along the axial direction of the motor is L1, and the stacking height of the second stator punching along the axial direction of the motor is L2, so that: L1/L2 is more than or equal to 0.001 and less than or equal to 0.9.
The two stator punching sheets are assembled according to different axial thicknesses, different compressor vibration noise improvement effects can be obtained, wherein the thicker the second punching sheet is, the better the noise improvement effect is, the thicker the first punching sheet is, the higher the motor energy efficiency is, and the two punching sheets can be assembled according to actual needs.
In some embodiments of the invention, the second stator lamination is sandwiched between the first stator laminations.
In some embodiments of the invention, the second stator lamination is sandwiched between the second sub-stator laminations.
In some embodiments of the present invention, the first stator lamination is sandwiched between the second stator laminations.
In some embodiments of the present invention, a side of the plurality of tooth roots facing the rotor core encloses an inner side wall of the stator, and a ratio of a diameter of the inner side wall of the stator to a diameter of an outer side wall of the stator core is greater than 0.5 and equal to or less than 0.58. The stator punching structure meeting the ratio range is beneficial to further improving the vibration.
EXAMPLE thirteen
In some embodiments of the present invention, a permanent magnet synchronous motor is provided, which includes the stator provided in any of the above second aspects, and a rotor, wherein the rotor is inserted into the stator inner hole of the stator core. The motor comprises the stator provided in any technical scheme of the second aspect, so that the motor provided by the invention has all the beneficial effects of the stator provided in any technical scheme of the second aspect, and redundant description is not repeated herein in order to avoid repetition.
Wherein, the parameter of motor satisfies the following relational expression:
5.18×10-7≤T×Di-3×TPV-1≤1.17×10-6；
5≤TPV≤45；
di is the diameter of an inner hole of the stator, T is the rated torque of the permanent magnet synchronous motor, TPV is the unit volume torque of the rotor, the unit of the rated torque T of the permanent magnet synchronous motor is N.m, the unit of the diameter Di of the inner hole of the stator is mm, and the unit volume torque TPV of the rotor is kN.m.m-3。
In the embodiment of the invention, the rated torque of the permanent magnet synchronous motor is T, the diameter of the inner hole of the stator, namely the inner diameter of the iron core of the stator is Di, the unit volume torque of the rotor is TPV, and the following requirements are met:
5.18×10-7≤T×Di-3×TPV-1≤1.17×10-6：
the value range of the unit volume torque TPV is as follows:
5kN·m·m-3≤TPV≤45kN·m·m-3；
through the value range of the combination variable of the rated torque T of the motor, the diameter Di of the inner hole of the stator and the unit volume torque TPV of the rotor, the permanent magnet synchronous motor can meet the power requirement of the compressor, and in addition, the permanent magnet synchronous motor and the compressor adopting the rotor can effectively reduce the magnetic leakage of the rotor, increase the utilization rate of the permanent magnet and improve the efficiency of the motor.
Example fourteen
In some embodiments of the present invention, fig. 5 shows a schematic structural diagram of a compressor according to an embodiment of the present invention, and the compressor 300 provided by the present invention includes a stator provided in any of the embodiments described above, or a motor provided in any of the embodiments described above, so that the compressor 300 includes all the beneficial effects of the stator and the motor in any of the embodiments described above, and redundant description is omitted herein for avoiding repetition.
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, also the bent axle 330 connects rotor core and power portion, and then can drive bent axle 330 and rotate and then drive rotor core and rotate at power portion during operation. Specifically, the crankshaft 330 of the compressor 300 is connected with the rotor core through the center hole of the rotor core.
Specifically, the compressor 300 further includes a stator 310, 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 fifteen
In some embodiments of the present invention, a refrigeration device is provided, where the refrigeration device includes the stator provided in any one of the above embodiments, or the motor provided in any one of the above embodiments, or the compressor provided in any one of the above embodiments, and therefore, the refrigeration device includes all the beneficial effects of the stator, the motor, and the compressor in any one of the above embodiments, and redundant description is omitted here for avoiding repetition.
It can be understood that the refrigeration device includes different product forms such as a refrigerator, an ice chest, a freezer, a refrigerating chamber, a split air conditioner, an integrated air conditioner, a window air conditioner, a central air conditioner, an ice maker, an ice cream machine, and the like, in the embodiment of the present invention, "refrigeration device" may refer to any electrical device having a refrigeration capability, and the specific product form of the refrigeration device is not limited in the embodiment of the present invention.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; 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 of the present invention, 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 present invention. In the present invention, 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, comprising:
the stator inner hole is used for penetrating the rotor;
the stator punching sheet comprises a stator yoke and a plurality of stator teeth distributed along the circumferential direction of the stator yoke;
the stator teeth include:
a tooth root connected with the stator yoke;
a crown connected to an end of the tooth root facing away from the stator yoke;
wherein, every stator punching has the edge the axial thickness of stator hole, at least one on the stator punching be provided with the magnetic conductance through-hole on the tooth crown, follow the axial of tooth root, the magnetic conductance through-hole is in projection on the tooth crown will the tooth crown deviates from the surface of tooth root separates for first tooth crown face and second tooth crown face, the area of first tooth crown face is less than the area of second tooth crown face.
2. The stator core according to claim 1, wherein the number of the stator laminations is multiple, and the multiple stator laminations comprise:
at least one first stator punching sheet;
the stator structure comprises at least one second stator punching sheet, wherein the first stator punching sheet and the second stator punching sheet are arranged in a stacked mode along the axial direction of a stator inner hole, and the second stator punching sheet is provided with a magnetic conduction through hole.
3. The stator core according to claim 2,
along the axial direction of the stator inner hole, the stacking height of the first stator punching sheet is a first height, the stacking height of the second stator punching sheet is a second height, the ratio of the first height to the second height is more than or equal to 0.001, and the ratio is less than or equal to 0.9.
4. The stator core according to claim 3,
and the first stator punching sheets and the second stator punching sheets are alternately stacked along the axial direction of the inner hole of the stator.
5. The stator core according to claim 4,
the stator punching structure comprises a rotor, a plurality of first stator punching sheets, a plurality of second stator punching sheets, a plurality of first stator punching sheets and a plurality of second stator punching sheets, wherein the first stator punching sheets and the second stator punching sheets are stacked continuously along the axial direction of the rotor to form a first punching section, the second stator punching sheets are stacked continuously to form a second punching section, and the first punching sections and the second punching sections are stacked alternately along the.
6. The stator core of claim 1 wherein the flux guide through-hole comprises at least one of:
circular magnetic conductance through-hole, square magnetic conductance through-hole, trapezoidal magnetic conductance through-hole, parallelogram magnetic conductance through-hole.
7. The stator core according to claim 1,
along the radial direction of the stator inner hole, the inner peripheral wall of the stator punching sheet comprises an arc line section and/or a straight line section, or a combination of the arc line section and the straight line section.
8. The stator core according to claim 1, characterized in that at least one of the crowns of at least one of the stator laminations is provided with at least one through hole portion and/or at least one flux guiding recess, both of which are located on the first crown face.
9. A stator, comprising:
a stator core according to any one of claims 1 to 8;
and the winding is wound on the tooth root of the stator core.
10. A permanent magnet synchronous motor, comprising:
the stator of claim 9;
and the rotor is arranged in the stator inner hole of the stator core in a penetrating manner.
11. The permanent magnet synchronous motor according to claim 10, wherein the parameters of the permanent magnet synchronous motor satisfy the following relation:
5.18×10-7≤T×Di-3×TPV-1≤1.17×10-6；
5≤TPV≤45；
di is the diameter of the inner hole of the stator, T is the rated torque of the permanent magnet synchronous motor, TPV is the unit volume torque of the rotor, the unit of the rated torque T of the permanent magnet synchronous motor is N.m, the unit of the diameter Di of the inner hole of the stator is mm, and the unit volume torque TPV of the rotor is kN.m.m-3。
12. A compressor, comprising:
the stator of claim 9; or
A permanent magnet synchronous machine as claimed in claim 10 or 11.
13. A refrigeration apparatus, comprising:
the stator of claim 9; or
A permanent magnet synchronous machine according to claim 10 or 11; or
The compressor of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/134804 WO2022110306A1 (en) | 2020-11-30 | 2020-12-09 | Stator core, stator, permanent magnet synchronous motor, compressor, and refrigeration device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011376512 | 2020-11-30 | ||
| CN202011376512X | 2020-11-30 |
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| CN112564320A true CN112564320A (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011415697.0A Pending CN112564320A (en) | 2020-11-30 | 2020-12-07 | Stator core, stator, permanent magnet synchronous motor, compressor and refrigeration equipment |
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| Country | Link |
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| CN (1) | CN112564320A (en) |
| WO (1) | WO2022110306A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114069905A (en) * | 2021-12-08 | 2022-02-18 | 安徽美芝精密制造有限公司 | Stator, motor, compressor and electrical equipment |
| CN114069906A (en) * | 2021-12-08 | 2022-02-18 | 安徽美芝精密制造有限公司 | Stator, motor, compressor and electrical equipment |
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| US5250867A (en) * | 1991-11-20 | 1993-10-05 | General Electric Company | Permanent magnet brushless DC motor having reduced cogging |
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| CN114069905A (en) * | 2021-12-08 | 2022-02-18 | 安徽美芝精密制造有限公司 | Stator, motor, compressor and electrical equipment |
| CN114069906A (en) * | 2021-12-08 | 2022-02-18 | 安徽美芝精密制造有限公司 | Stator, motor, compressor and electrical equipment |
| CN114069906B (en) * | 2021-12-08 | 2024-05-31 | 安徽美芝精密制造有限公司 | Stator, motor, compressor and electrical equipment |
| CN114069905B (en) * | 2021-12-08 | 2024-06-07 | 安徽美芝精密制造有限公司 | Stator, motor, compressor and electrical equipment |
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|---|---|
| WO2022110306A1 (en) | 2022-06-02 |
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