CN107968505A - A kind of compressor electric motor and refrigeration plant - Google Patents
A kind of compressor electric motor and refrigeration plant Download PDFInfo
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- CN107968505A CN107968505A CN201711481689.4A CN201711481689A CN107968505A CN 107968505 A CN107968505 A CN 107968505A CN 201711481689 A CN201711481689 A CN 201711481689A CN 107968505 A CN107968505 A CN 107968505A
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- rotor core
- electric motor
- cambered surface
- compressor electric
- rotor
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 15
- 230000010349 pulsation Effects 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 10
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 10
- 239000000696 magnetic material Substances 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 15
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 abstract description 6
- 230000037431 insertion Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 24
- 230000004907 flux Effects 0.000 description 19
- 230000008859 change Effects 0.000 description 6
- 239000000306 component Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- 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
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/18—Windings for salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- 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
Abstract
The invention discloses a kind of compressor electric motor and refrigeration plant.The compressor electric motor is included stator assembly and rotor assembly, and rotor assembly includes hollow rotor core and the axle sleeve coordinated with rotor core, and axle sleeve insertion rotor core inner-diameter portion is interference fitted with rotor core；Rotor magnetic steel material is Rare-Earth Magnetic material, and the outer circumferential surface of rotor core includes the cambered surface of two kinds of different curvature radius, and along the circumferential direction of rotor core, the cambered surface of two kinds of different curvature radius distributes alternately.The present invention is distributed alternately by designing the outer circumferential surface of hollow rotor core using the cambered surface of two kinds of different curvature radius, by adjusting the length of the cambered surface of different curvature radius, and hollow rotor core inner-diameter portion is using axle sleeve interference fit insertion, substantially reduce the harmonic components in the counter potential waveform of compressor electric motor, make counter potential waveform closer to sine wave, magnetic moment pulsation is reduced, reduce electromagnetic noise, reasonably optimizing motor.
Description
Technical field
The present embodiments relate to Compressor Technology field, more particularly to a kind of compressor electric motor and refrigeration plant.
Background technology
With the improvement of people ' s living standards with raising of the country for refrigerator efficiency level, refrigerator it is energy-efficient, hold
Product rate increase is the important directions of following refrigerator development, and core component of the freezer compressor as refrigerator, its efficiency and volume are
Refrigerator whether realize energy-efficient, plot ratio whether the important indicator that can increase.And the height of compressor electric motor and it is outer straight
Connect the size that decide compressor.
The primary structure of existing freezer compressor variable-frequency motor is that stator winding uses concentratred winding or Distributed Winding, is turned
Sub- iron core uses ferrite material, and stator uses copper wire or aluminum steel enameled wire.Because the magnetic property of ferrite material inherently is inclined
Low, in order to ensure the intensity in magnetic field, the volume of rotor can not reduce.Rotor magnetic attraction is low, during overcoming piston stroke
Torque changes, it is necessary to which the rotary inertia of rotor is bigger, and the radial dimension for being unfavorable for rotor reduces, thus stator dimensions can not
Reduce.Moreover, compressor electric motor in refrigerator is axial vertically-mounted, in order to overcome the dead weight resistance of rotor and to greatest extent
Using the magnetic field of stator end, the height of rotor is higher than stator, therefore is unfavorable for the attenuating of compressor complete machine height.
The content of the invention
The present invention provides a kind of compressor electric motor and refrigeration plant, to realize compressor electric motor miniaturization, efficient, mitigation
The weight of compressor electric motor, and can be effectively improved the electric and magnetic oscillation noise of compressor electric motor.
In a first aspect, an embodiment of the present invention provides a kind of compressor electric motor, the compressor electric motor include stator module and
Rotor assembly；
The rotor assembly includes hollow rotor core and the axle sleeve coordinated with the rotor core, the axle sleeve are embedding
Enter the rotor core inner-diameter portion to be interference fitted with the rotor core；
Magnetic steel material is Rare-Earth Magnetic material in the rotor assembly, and the outer circumferential surface of the rotor core includes two kinds of different curvatures
The cambered surface of radius, along the circumferential direction of the rotor core, the cambered surface of described two different curvature radius distributes alternately.
Specifically, the cambered surface of described two different curvature radius is respectively the first cambered surface and the second cambered surface；First arc
The radius of curvature in face is less than the radius of curvature of second cambered surface；
The part composition first that the section of the rotor core radially corresponds to first cambered surface is fan-shaped, described turn
The part that the section of sub- iron core radially corresponds to second cambered surface forms the second sector；
Wherein, the endpoint of the circular arc in first sector is respectively first end point and the second endpoint, by described first
Endpoint and the straight line in the center of circle corresponding to second sector are first straight line, fan-shaped with described second by second endpoint
The straight line in the corresponding center of circle is second straight line, and the scope of the first straight line and acute angle theta folded by the second straight line is 38/P
≤ θ≤82/P, wherein P are the number of pole-pairs of the compressor electric motor of refrigeration plant.
Specifically, the radius of curvature of the radius of curvature of first cambered surface and second cambered surface and the motor d axis and q
The angle relation of axis.
Specifically, the stator module further includes：
Stator winding, the stator winding use sine windings.
Specifically, the rotor core is formed using the electromagnetic steel plate superposition rolling of 0.25-0.35mm.
Specifically, the internal diameter of the rotor core and the ratio of outside diameter are between 0.5~0.7.
Specifically, the magnetic moment pulsation of the compressor electric motor is less than or equal to 0.05Nm.
Specifically, the axle sleeve includes outer shaft and internal axle sleeve, the material identical of the outer shaft and the internal axle sleeve or
Person is different.
Specifically, the stator module uses 4 pole, 6 slot structure.
Second aspect, the embodiment of the present invention additionally provide a kind of refrigeration plant, which includes any reality of the present invention
The compressor electric motor of the refrigeration plant of example offer is provided.
The present invention uses alternate point of the cambered surface of two kinds of different curvature radius by designing the outer circumferential surface of hollow rotor core
Cloth, is matched somebody with somebody by adjusting the length of the cambered surface of different curvature radius, and hollow rotor core inner-diameter portion using axle sleeve interference
Insertion is closed, the harmonic components in the counter potential waveform of compressor electric motor is substantially reduced, makes counter potential waveform closer to sine
Ripple, reduce magnetic moment pulsation, reduce electromagnetic noise, reasonably optimizing motor.
Brief description of the drawings
Fig. 1 is a kind of radial section knot stator assembly and rotor assembly of compressor electric motor provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 2 is a kind of front view of the three-dimensional structure of axle sleeve provided in an embodiment of the present invention；
Fig. 3 is a kind of left view of the three-dimensional structure of axle sleeve provided in an embodiment of the present invention；
Fig. 4 is a kind of structure diagram of rotor assembly provided in an embodiment of the present invention；
Fig. 5 is a kind of three dimensional structure diagram of rotor assembly provided in an embodiment of the present invention；
Fig. 6 is the three dimensional structure diagram of another rotor assembly provided in an embodiment of the present invention；
Fig. 7 is a kind of three dimensional structure diagram of stator provided in an embodiment of the present invention；
Fig. 8 is a kind of three dimensional structure diagram of rotor core provided in an embodiment of the present invention；
Counter potential waveform schematic diagram when Fig. 9 is a kind of difference θ values provided in an embodiment of the present invention；
Figure 10 is the structure diagram of a kind of stator provided in an embodiment of the present invention and winding；
Figure 11 is corresponding magnetic moment pulsation schematic diagram when rotor core internal diameter Φ 1 provided in an embodiment of the present invention is 14；
Figure 12 is corresponding magnetic moment pulsation schematic diagram when rotor core internal diameter Φ 1 provided in an embodiment of the present invention is 20；
Figure 13 is corresponding magnetic moment pulsation schematic diagram when rotor core internal diameter Φ 1 provided in an embodiment of the present invention is 25；
Figure 14 is corresponding magnetic moment pulsation schematic diagram when rotor core internal diameter Φ 1 provided in an embodiment of the present invention is 30；
Figure 15 is the corresponding back-emf of different rotor internal diameter provided in an embodiment of the present invention, magnetic moment pulsation and flux density
Variation tendency schematic diagram.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
It illustrate only part related to the present invention rather than entire infrastructure in description, attached drawing.
Fig. 1 is a kind of radial section knot stator assembly and rotor assembly of compressor electric motor provided in an embodiment of the present invention
Structure schematic diagram, Fig. 2 are a kind of front views of the three-dimensional structure of axle sleeve provided in an embodiment of the present invention, and Fig. 3 is the embodiment of the present invention
A kind of left view of the three-dimensional structure of the axle sleeve provided, Fig. 4 is that a kind of structure of rotor assembly provided in an embodiment of the present invention is shown
It is intended to, shown as shown in Figure 1, Figure 2, Figure 3 and Figure 4, which includes：
Stator module 110 and rotor assembly 120；Rotor assembly 120 include hollow rotor core 121 and with rotor iron
The axle sleeve 130 that core coordinates, axle sleeve 130 are embedded in 121 inner-diameter portion of rotor core and are interference fitted with rotor core 121.
Magnetic steel material is Rare-Earth Magnetic material in rotor assembly 120, and the outer circumferential surface of rotor core 121 includes two kinds of different curvatures half
The cambered surface in footpath, along the circumferential direction of rotor core 121, the cambered surface of two kinds of different curvature radius distributes alternately.
As shown in Figures 2 and 3, the shape of the outer circumferential surface of axle sleeve 130 is identical with the hollow profile of rotor core 121, axle sleeve
The 130 hollow shaft for being used to be embedded in rotor core 121.Axle sleeve 130 is embedded in 121 inner-diameter portion of rotor core and rotor core
During 121 interference fit, the outside diameter of axle sleeve 130 is more than the internal diameter of rotor core 121.When axle sleeve 130 is embedded in 121 internal diameter of rotor core
When, many kinds of measures can be taken to be embedded in, such as special tool(s) extruding can be used, or utilize the spy expanded with heat and contract with cold
Property, rotor core 121 is heated, axle sleeve 130 is embedded in rapidly by internal diameter when expanding, contraction rear axle housing 130 to be cooled and rotor iron
Core 121 just tightly matches somebody with somebody integrator.Also axle sleeve 130 can be cooled down, effect is consistent.
Fig. 5 is a kind of three dimensional structure diagram of rotor assembly provided in an embodiment of the present invention, and Fig. 6 is the embodiment of the present invention
The three dimensional structure diagram of another rotor assembly of offer.As shown in Figure 2, Figure 5 and Figure 6, axle sleeve 130 includes outer shaft 131
With internal axle sleeve 132, the material of outer shaft 131 and internal axle sleeve 132 can be identical and different.The internal diameter of outer shaft 131 in axle sleeve 130
Equal with the outside diameter of internal axle sleeve 132, outer shaft 131 and internal axle sleeve 132 are bonded as axle sleeve 130, and the hollow parts of internal axle sleeve 132 are used
In embedded rotor shaft.Outer shaft 131 and the material of internal axle sleeve 132 may be the same or different.When outer shaft 131 and interior
, can be with selected as magnetic steel material during the material identical of axle sleeve 132.When outer shaft 131 is different with the material of internal axle sleeve 132, outside
The material of axle sleeve 131 can be with selected as synthetic material, such as can be nylon.The material of internal axle sleeve 132 can be with selected as magnet steel
Material.The inner wall of internal axle sleeve 131 can be smooth or including multiple sawtooth being evenly distributed on inner wall, axle sleeve
130 are engaged transmission by the sawtooth on internal axle sleeve 132 with rotor shaft realization.
Compressor electric motor power is smaller, and the dominant loss for influencing motor performance is iron loss.Iron loss refers to silicon steel sheet in excitation
The part energy itself consumed under state.Think that iron loss is substantially equal to no-load loss in engineering, in theory iron loss=zero load
Loss-windmill consumption-zero load stray loss.Iron loss is divided into eddy-current loss and magnetic hystersis loss again.
In order to reduce eddy-current loss, sheet metal can be used.Exemplarily, rotor core 121 can use 0.25-
The electromagnetic steel plate superposition rolling of 0.35mm is formed, so as to reduce eddy current, effectively reduces eddy-current loss.In selection electromagnetic steel
During the thickness of plate, it should be made choice according to air gap flux density.Air gap flux density should not be too high, but utilization that is too low and can influencing material
Rate, therefore suitable air gap flux density is selected, so that it is determined that the thickness of electromagnetic steel plate.
The principal element for influencing magnetic hystersis loss is two aspects of running frequency and flux density.Flux density is unit area
Interior magnetic field intensity, compares the performance of the electromagnetic steel plate of selection, and flux density domination is relatively slow in relatively more linear and ascensional range
Section, magnetic hystersis loss can be effectively reduced, so as to reduce iron loss.In addition, the magnet steel portion of the rotor assembly 120 of compressor electric motor
When point using rare earth material, compared with traditional ferrite motor, flux density can decline 1.8% or so, therefore reduce
Magnetic hystersis loss, reduces iron loss, so as to improve the efficiency of compressor electric motor.
As shown in figure 4, further including 4 magnetic slots 124 on rotor assembly 120, permanent magnetic field is formed for being inserted into magnet steel.Turn
The material of the magnet steel part of sub-component 120 is rare earth material, such as neodymium iron boron, its magnetic energy product (refer to any point on demagnetizing curve
Magnetic flux density B and magnetic field intensity H product, that is, BH, be one of the important parameter for weighing energy size stored by magnet.) obvious
Higher than conventional Ferrite Material, it can effectively reduce the volume of rotor assembly 120.Compressor electric motor is axial vertical peace
Dress, improves magnetic energy product using rare earth material, rotor assembly 120 and stator module 110 can be reduced in the case of equal-wattage
Height.Under normal circumstances, under equal-wattage, the magnet steel part of rotor assembly 120 uses the rotor of the motor of rare earth material
The height of component 120 lower than the height of the rotor assembly of the motor of Ferrite Material 30~35%, the height drop of stator module 110
Low 20%.Motor uses rare earth material, and the magnetic attraction of rotor core 121 is bigger than ferritic magnetic attraction, therefore can be effectively
Overcome the torque fluctuations of piston compressor, the rotary inertia of rotor assembly 120 is small.Therefore the outer of rotor assembly 120 can be reduced
Footpath, while the outside diameter of stator module 110 can be reduced, so that compressor electric motor overall dimensions minimize.
The inner-diameter portion of hollow rotor core 121 is embedded in using axle sleeve 130 so that axle sleeve 130 instead of solid turn
The inner-diameter portion of sub- iron core.Under normal circumstances, the material hardness of axle sleeve 130 is more than the hardness of 121 material of rotor core, makes motor
Integral hardness improves, and magnetic moment pulsation reduces, and significantly reduces the vibrating noise of motor.For example, the material of rotor core 121 can
To select the electromagnetic steel plate of cold rolled silicon steel material, axle sleeve 130 can then select 45# steel so that the material hardness of axle sleeve 130 is more than
The material hardness of rotor core 121.
As shown in Figure 1,121 outer circumferential surface of rotor core includes the cambered surface of two kinds of different curvature radius, two kinds of different curvatures half
The cambered surface in footpath distributes alternately.Seamlessly transitted between the cambered surface of two kinds of different curvature radius, by adjusting the arc of different curvature radius
The difference of the radius of curvature of the circumferential lengths in face or two kinds of cambered surfaces, can adjust the sinusoidal waveform of the back-emf of compressor electric motor, shape
Into harmonic compensation, the waveform of back-emf is set more to level off to sine wave, closer to be constant, reduction torque pulsation, subtracts electromagnetic torque
The small shake of motor, so as to effectively improve vibrating noise and loss, improves the efficiency of motor.
The technical solution of the present embodiment, the arc of two kinds of different curvature radius of outer circumferential surface by designing hollow rotor core
The difference of the radius of curvature of the circumferential lengths in face or two kinds of cambered surfaces, makes the waveform of the back-emf of compressor electric motor level off to sine wave,
For electromagnetic torque closer to be constant, reduction torque pulsation, reduces the shake of motor, thus effectively improve vibrating noise and
Loss, improves the efficiency of motor.On this basis using the inner-diameter portion of axle sleeve insertion rotor core so that motor is integrally hard
Degree improves, and magnetic moment pulsation reduces, and create a further reduction the vibrating noise of motor.
On the basis of above-described embodiment, Fig. 7 is a kind of three dimensional structure diagram of stator provided in an embodiment of the present invention,
Fig. 8 is a kind of three dimensional structure diagram of rotor core provided in an embodiment of the present invention, with reference to figure 1, Fig. 7 and Fig. 8, stator module
110 use 4 pole, 6 slot structure.
Stator module 110 uses 4 pole, 6 slot structure, compared with the compressor electric motor of traditional 6 pole, 9 slot structure, can make electricity
Frequency declines 1/3, reduces magnetic hystersis loss, therefore iron loss reduces accordingly therewith.
In addition, when stator module 110 is using 46 slot structure of pole, material is saved than traditional 6 pole, 9 slot structure, and
Under identical output power, motor stator height reduction 20%；Rotor height lowers 30-35%, alleviates motor weight, is reducing
While flux density, iron loss is further effectively reduced.Magnetic moment pulsation and vibrations and the noise of complete machine are reduced at the same time.Cause
This, when stator module 110 is using 46 slot structure of pole, although flux density increased, due to using electricity during 46 slot structure of pole
Frequency reduces, and the total quality of compressor electric motor reduces, and so that flux density reduces, therefore is integrally considering compressor
During the efficiency of motor, the magnetic hystersis loss of compressor electric motor is reduced using 4 pole, 6 slot structure, improves the efficiency of compressor electric motor,
The performance of compressor electric motor is improved.
The technical solution of the present embodiment, 4 pole, 6 slot structure is used by designing stator module, makes the electricity frequency of compressor electric motor
Rate declines, so as to reduce the magnetic hystersis loss of compressor electric motor, reduces iron loss, improves the efficiency of compressor electric motor, compresses
The performance of electromechanical machine is improved.
With continued reference to Fig. 4 and Fig. 8, as shown in Figure 4 and Figure 8, the cambered surface of two kinds of different curvature radius is respectively the first cambered surface
122 and second cambered surface 123；The radius of curvature of first cambered surface 122 is less than the radius of curvature of the second cambered surface 123.
The part that the section of rotor core 121 radially corresponds to the first cambered surface 122 forms the first sector ABO, rotor
The part that the section of iron core 121 radially corresponds to the second cambered surface 123 forms the second sector BCQ.
Wherein, the endpoint of the circular arc on the first sector ABO is respectively first end point A and the second terminal B, by first end point
The straight line of center of circle Q corresponding to the sectors of A and second BCQ is first straight line AQ, right by the second terminal B and the second sector BCQ institutes
The straight line of the center of circle Q answered be acute angle theta folded by second straight line BQ, first straight line AQ and second straight line BQ scope be 38/P≤θ≤
82/P, wherein P are the number of pole-pairs of compressor electric motor.
The radius of curvature of first cambered surface 122 is less than the radius of curvature of the second cambered surface 123, so the radius of the first cambered surface 122
More than the radius of the second cambered surface 123.First cambered surface 122 forms the salient pole of rotor core 121, the symmetry axis shape of the first cambered surface 122
Into the d axis of rotor core 121, the symmetry axis of the second cambered surface 123 forms the q axis of rotor core 121.The center of first cambered surface 122
Overlapped with the center of circle of the inner-diameter portion of rotor core 121, be all O points.The center Q of second cambered surface 123 is in d axis along rotor core
On extended line on the direction of the center of circle O of 121 inner-diameter portion, distance O points have a certain distance, and distance is h.First cambered surface
Two endpoints of 122 arc length and the center Q composition angle thetas of the second cambered surface 123, by adjusting the size of θ, make compressor electric motor
Back-emf waveform closer to sine wave, for electromagnetic torque closer to be constant, reduction torque pulsation, reduces trembling for motor
It is dynamic, so as to effectively improve vibrating noise and loss, improve the efficiency of motor.
Counter potential waveform schematic diagram when Fig. 9 is a kind of difference θ values provided in an embodiment of the present invention.As shown in figure 9, pass through choosing
Different θ values are taken, the oscillogram of back-emf changes.In fig.9, abscissa is difference on the circumference of rotor core 121, is indulged
Coordinate is the value of back-emf.In the different schemes for changing θ values, ensure that the other specification of motor is consistent, such as the load of motor
Electric current, the pole slot structure of rotor and winding style etc., to ensure that the waveform change of the back-emf in different schemes is by θ values
Change what is determined.When selection number of pole-pairs P is 2, the θ values in scheme 1 are 41 °, and θ values are 21 ° in scheme 2, and θ values are in scheme 3
35 °, θ values are 28 ° in scheme 4.It can thus be seen that the harmonic components of the waveform of back-emf in scheme 4 are minimum.Therefore can be with
By varying the waveform of the back-emf of θ values adjustment compressor electric motor, when θ values be 28 ° constantly, the waveform of back-emf levels off to sine
Ripple, it is constant that electromagnetic torque is closer, therefore can reduce torque pulsation, the shake of motor is reduced, so as to effectively improve
Vibrating noise and loss, improve the efficiency of motor.
The technical solution of the present embodiment, by adjusting θ values, makes the waveform of back-emf of compressor electric motor closer to sine
Ripple, electromagnetic torque reduce torque pulsation, reduce the shake of motor, make an uproar so as to effectively improve vibration closer to being constant
Sound and loss, improve the efficiency of motor.
, can be by adjusting the first arc after the number of pole-pairs P for determining compressor electric motor on the basis of above-mentioned each embodiment
The distance between the length of the circular arc in face 122 or the first fan-shaped center of circle corresponding with the second sector h adjustment θ values.
θ values are determined by the arc length and radius of the first cambered surface 122 and the second cambered surface 123 it can be seen from Fig. 4 and Fig. 8
Fixed, the arc length of the first cambered surface 122 determines the distance between first end point A and the second terminal B, the half of the first cambered surface 122
The radius of footpath and the second cambered surface 123 determines that the distance between the first corresponding centers of circle of the sector sector BCQ of ABO and second h's is big
It is small.Therefore the radius of curvature of the first cambered surface 122 and the radius of curvature of the second cambered surface 123 and the first cambered surface 122 and the second cambered surface
The relation of 123 radius of curvature is related with θ values, i.e., with the d axis of compressor electric motor and the angle relation of q axis.
On the basis of above-mentioned each embodiment, Figure 10 is the structure of a kind of stator provided in an embodiment of the present invention and winding
Schematic diagram.As shown in Figure 10, stator module further includes 111 (not shown) of stator winding, stator winding 111 using it is sinusoidal around
Group.
Using sine windings, the harmonic wave in its composite magnetic power is significantly weakened, therefore the waveform of the back-emf in motor
Middle harmonic components are also reduced, so as to reduce torque pulsation, reduce the shake of motor, so as to effectively improve vibrating noise
And be lost, improve the efficiency of motor.
On the basis of above-described embodiment, with continued reference to Fig. 4, as shown in figure 4, the internal diameter Φ 1 and outside diameter of rotor core 121
The ratio of Φ 2 is between 0.5~0.7.
When rotor diameter Φ 2 is constant, when expanding the internal diameter Φ 1 of rotor core 121, it is possible to reduce rotor core 121
The usage amount of electromagnetic steel plate, therefore the flux density of rotor core 121 and the iron loss influence that weight band is next can be balanced, also cause
Iron loss minimizes.Simultaneously as rotor core 121 uses rare-earth permanent magnet, there is high energy product and high-coercive force, therefore subtracting
It can ensure magnetic field intensity during the usage amount of few electromagnetic steel plate, while can fully realize the miniaturization of motor, effectively take into account existing
Compressor arrangement.
Constant in rotor diameter Φ 2, when being 49, Figure 11 is that rotor core internal diameter Φ 1 provided in an embodiment of the present invention is 14
When corresponding magnetic moment pulsation schematic diagram, Figure 12 is corresponding magnetic when rotor core internal diameter Φ 1 provided in an embodiment of the present invention is 20
Square pulsation schematic diagram, Figure 13 are corresponding magnetic moment pulsation signal when rotor core internal diameter Φ 1 provided in an embodiment of the present invention is 25
Figure, Figure 14 are corresponding magnetic moment pulsation schematic diagram when rotor core internal diameter Φ 1 provided in an embodiment of the present invention is 30.As selected θ
After value, when not changing the other specification of compressor electric motor of refrigeration plant, change the value of the internal diameter Φ 1 of rotor core 121, see
Examine the value of the magnetic moment pulsation of the longitudinal axis.As shown in Figure 11 to 14, abscissa is the point on the circumference of rotor core 121, ordinate
It is magnetic moment pulsating quantity, it can be seen from Figure 11 to Figure 14 when the internal diameter Φ 1 of rotor core 121 is 14, magnetic moment pulsation is
0.037Nm, when the internal diameter Φ 1 of rotor core 121 is 20, magnetic moment pulsation is 0.037Nm, as the internal diameter Φ 1 of rotor core 121
For 25 when, magnetic moment pulsation be 0.030Nm, when rotor core 121 internal diameter Φ 1 be 30 when, magnetic moment pulse be 0.024Nm, at this time
Magnetic moment pulsation is smaller.It is thereby possible to select the internal diameter Φ 1 of rotor core 121 be 30, outside diameter Φ 2 be 49, at this time internal diameter Φ 1 with
The ratio of outside diameter Φ 2 is 0.6 or so, and magnetic moment pulsation is minimum.
Figure 15 is the corresponding back-emf of different rotor internal diameter provided in an embodiment of the present invention, magnetic moment pulsation and flux density
Variation tendency schematic diagram, when rotor diameter Φ 2 is 49, as shown in figure 15, transverse axis is that the internal diameter Φ 1 of rotor core 121 is worth, and is turned
The internal diameter Φ 1 of sub- iron core 121 is using the insertion design of axle sleeve 130.Wherein, curve 101 is the corresponding back-emf of different rotor internal diameter
Change trend curve, curve 102 is the change trend curve of different rotor internal diameter corresponding magnetic moment pulsation, and curve 103 is not
The change trend curve of corresponding flux density with rotor internal diameter.As can be seen that increase with the internal diameter Φ 1 of rotor core 121,
Magnetic moment pulsating quantity constantly reduces.In the process, back-emf has certain downward trend, but range of decrease slope is pulsed less than magnetic moment
Downward trend.In addition, it can be seen that increase with the internal diameter Φ 1 of rotor core 121, though flux density has rising, and tiltedly
The more slow trend of rate, therefore can be by flux density domination in relatively linear and more slow ascensional range section.Comprehensive back-emf,
Magnetic moment is pulsed and the variation tendency of flux density, and when the internal diameter Φ 1 of rotor core 121 is 30, compressor electric motor has reached effect
Rate peak, the internal diameter Φ 1 for thus selecting rotor core 121 are 30, and outside diameter Φ 2 is 49, the ratio of internal diameter Φ 1 and outside diameter Φ 2
For 0.6 or so.
When the material of the magnet steel part of rotor assembly 120 is terres rares, and outside diameter Φ 2 is 49, rotor core 121 it is interior
Footpath Φ 1 is 30, and when the inner-diameter portion of rotor core 121 is not embedded in axle sleeve 130, magnetic moment pulsation is 0.024Nm.Therefore rotor iron is worked as
When the inner-diameter portion insertion axle sleeve 130 of core 121 designs, magnetic moment pulsation is less than 0.024Nm.It follows that selected rotor core 121
Internal diameter Φ 1 be 30 after, the pulsation of the magnetic moment of compressor electric motor is less than or equal to 0.024Nm.
The technical solution of the present embodiment, by designing the internal diameter of rotor core, comprehensive back-emf, magnetic moment pulsation and flux are close
The variation tendency of degree, when the efficiency of compressor electric motor peaks, chooses rotor core internal diameter at this time as compressor
The internal diameter of the rotor core of motor, so as to improve the efficiency of compressor electric motor, and improves the magnetic hystersis loss of compressor electric motor.
The embodiment of the present invention additionally provides a kind of refrigeration plant, which includes what any embodiment of the present invention provided
The compressor electric motor of refrigeration plant.For example, refrigeration plant can be refrigerator or other similar small-type refrigeration appliances.
Note that it above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
It can include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of compressor electric motor, it is characterised in that including stator assembly and rotor assembly；The rotor assembly includes hollow
Rotor core and the axle sleeve coordinated with the rotor core, the axle sleeve are embedded in the rotor core inner-diameter portion and described turn
Sub- iron core interference fit；
Magnetic steel material is Rare-Earth Magnetic material in the rotor assembly, and the outer circumferential surface of the rotor core includes two kinds of different curvature radius
Cambered surface, along the circumferential direction of the rotor core, the cambered surface of described two different curvature radius distributes alternately.
2. compressor electric motor according to claim 1, it is characterised in that
The cambered surface of described two different curvature radius is respectively the first cambered surface and the second cambered surface；The radius of curvature of first cambered surface
Less than the radius of curvature of second cambered surface；
The part that the section of the rotor core radially corresponds to first cambered surface forms the first fan-shaped, rotor iron
The part that the section of core radially corresponds to second cambered surface forms the second sector；
Wherein, the endpoint of the circular arc in first sector is respectively first end point and the second endpoint, by the first end point
Straight line with the center of circle corresponding to second sector is first straight line, right by second endpoint and the described second fan-shaped institute
The straight line in the center of circle answered is second straight line, the scope of the first straight line and acute angle theta folded by the second straight line for 38/P≤θ≤
82/P, wherein P are the number of pole-pairs of refrigerator compressor motor.
3. compressor electric motor according to claim 2, it is characterised in that the radius of curvature of first cambered surface and described
The radius of curvature of two cambered surfaces and the motor d axis and the angle relation of q axis.
4. compressor electric motor according to claim 1, it is characterised in that the stator module further includes：
Stator winding, the stator winding use sine windings.
5. compressor electric motor according to claim 1, it is characterised in that the rotor core is using 0.25-0.35mm's
Electromagnetic steel plate superposition rolling is formed.
6. compressor electric motor according to claim 1, it is characterised in that the internal diameter of the rotor core and the ratio of outside diameter
Between 0.5~0.7.
7. compressor electric motor according to claim 6, it is characterised in that the compressor electric motor magnetic moment pulsation be less than etc.
In 0.05Nm.
8. compressor electric motor according to claim 1, it is characterised in that the axle sleeve includes outer shaft and internal axle sleeve, institute
State the material identical or difference of outer shaft and the internal axle sleeve.
9. compressor electric motor according to claim 1, it is characterised in that the stator module uses 4 pole, 6 slot structure.
10. a kind of refrigeration plant, it is characterised in that include the compressor electric motor of any refrigeration plants of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711481689.4A CN107968505A (en) | 2017-12-30 | 2017-12-30 | A kind of compressor electric motor and refrigeration plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711481689.4A CN107968505A (en) | 2017-12-30 | 2017-12-30 | A kind of compressor electric motor and refrigeration plant |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005086955A (en) * | 2003-09-10 | 2005-03-31 | Aichi Elec Co | Permanent magnet rotating machine |
| JP2007252018A (en) * | 2006-03-13 | 2007-09-27 | Aichi Elec Co | Permanent magnet motor |
| CN102347669A (en) * | 2010-08-05 | 2012-02-08 | 中国江南航天工业集团林泉电机厂 | Limited angle torque motor and method for manufacturing same |
| JP2014096869A (en) * | 2012-11-07 | 2014-05-22 | Daikin Ind Ltd | Rotor of magnet embedded type motor |
| CN208028676U (en) * | 2017-12-30 | 2018-10-30 | 苏州爱知科技有限公司 | A kind of compressor electric motor and refrigeration equipment |
-
2017
- 2017-12-30 CN CN201711481689.4A patent/CN107968505A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005086955A (en) * | 2003-09-10 | 2005-03-31 | Aichi Elec Co | Permanent magnet rotating machine |
| JP2007252018A (en) * | 2006-03-13 | 2007-09-27 | Aichi Elec Co | Permanent magnet motor |
| CN102347669A (en) * | 2010-08-05 | 2012-02-08 | 中国江南航天工业集团林泉电机厂 | Limited angle torque motor and method for manufacturing same |
| JP2014096869A (en) * | 2012-11-07 | 2014-05-22 | Daikin Ind Ltd | Rotor of magnet embedded type motor |
| CN208028676U (en) * | 2017-12-30 | 2018-10-30 | 苏州爱知科技有限公司 | A kind of compressor electric motor and refrigeration equipment |
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