CN112688443A - Stator punching sheet monomer, stator punching sheet and motor stator - Google Patents
Stator punching sheet monomer, stator punching sheet and motor stator Download PDFInfo
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- CN112688443A CN112688443A CN202011068089.7A CN202011068089A CN112688443A CN 112688443 A CN112688443 A CN 112688443A CN 202011068089 A CN202011068089 A CN 202011068089A CN 112688443 A CN112688443 A CN 112688443A
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- 238000004080 punching Methods 0.000 title claims abstract description 65
- 239000000178 monomer Substances 0.000 title claims abstract description 25
- 238000004804 winding Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 2
- 238000003475 lamination Methods 0.000 claims 1
- 230000004907 flux Effects 0.000 description 23
- 238000004364 calculation method Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 235000019687 Lamb Nutrition 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses a stator punching sheet monomer, a stator punching sheet and a motor stator, wherein an arc-shaped groove is formed in the upper surface of the stator punching sheet monomer, an arc-shaped part is arranged on the lower part of the stator punching sheet monomer, a positioning bulge is arranged on one side of the stator punching sheet monomer, a positioning groove is formed in the other side of the stator punching sheet monomer, the stator punching sheet comprises a plurality of stator punching sheet monomers, the stator punching sheet monomers are sequentially connected end to end in an annular shape to form the stator punching sheet, and the motor stator is formed by stacking the plurality of stator punching sheets.
Description
Technical Field
The invention relates to a solar power supply water pump motor, in particular to a stator punching sheet monomer, a stator punching sheet and a motor stator.
Background
The motor is a device for realizing conversion between electric energy and mechanical energy and is also a very important part in the water pump, the stator is a very important part in the motor, the power density of the traditional water pump is generally low, the requirement of the market cannot be met by adopting a common high-power-density motor, and only a constant-speed function is provided. The inability to satisfy the market needs for light weight and intelligence.
Therefore, the stator of the motor needs to be designed to improve the functionality of the motor.
Disclosure of Invention
In view of this, the invention provides a stator punching sheet monomer, a stator punching sheet and a motor stator to solve the above technical problems.
In order to achieve the purpose, the invention provides the following technical scheme:
according to the stator punching sheet monomer provided by the invention, the arc-shaped groove is formed in the stator punching sheet monomer and is used for reducing deformation generated in the processing process.
Furthermore, an arc-shaped part is arranged on the lower part of the stator punching sheet monomer and used for ensuring that the motor has a normal sine wave.
Furthermore, one side of the stator punching sheet monomer is provided with a positioning bulge, and the positioning bulge is used for improving the accuracy in installation.
Furthermore, a positioning groove is formed in the other side of the stator punching sheet body and used for improving the accuracy in installation.
The stator punching sheet comprises a plurality of stator punching sheet monomers, and the stator punching sheet monomers are annularly connected end to end in sequence to form the stator punching sheet together.
Further, the positioning recess is received in the positioning projection at an adjacent position.
Furthermore, the number of the stator punching sheet monomers is twelve, and the stator punching sheet monomers are used for winding the enameled wire, so that a magnetic field is formed.
The invention provides a motor stator which is formed by stacking a plurality of stator punching sheets.
The technical scheme can show that the invention has the advantages that:
1. the stator is a silicon wafer, and the high-efficiency silicon wafer is selected, so that the iron loss can be reduced, and the efficiency is improved.
2. The invention designs the aspects of winding technology, motor heat dissipation mode, light weight design and the like, can improve the power density of the motor, obtains the parameters of the size of each part of the motor stator, winding wire gauge, motor performance and the like through the calculation of an equivalent magnetic circuit method, simulates a performance parameter curve of the motor through motor design software, simulates and analyzes the influence of different stator and rotor materials on the performance parameters of the motor, performs simulation research on the working characteristics and magnetic field distribution of the motor by adopting a finite element method, verifies the accuracy of the equivalent magnetic circuit method, simulates and calculates the influence of different motor core lengths, air gap lengths and rotor slot numbers on the performance of the motor, reduces the weight of the motor in the aspect of light weight design and improves the power density of the motor.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a stator punching sheet monomer of the invention.
Fig. 2 is a schematic structural diagram of the stator punching sheet of the present invention.
Fig. 3 is a partially enlarged view of a portion a of fig. 2.
FIG. 4 is a schematic diagram showing the relationship between residual magnetic induction and three-dimensional alternating magnetic field.
Fig. 5 is a simplified magnetic circuit diagram of the motor field in the present invention.
Fig. 6 is a graph of the effective magnetic energy product actually involved in the electromechanical energy conversion in the present invention.
FIG. 7 is a diagram of the programming steps of the present invention.
List of reference numerals: stator punching 1, stator punching monomer 2, location arch 21, positioning groove 22, arc portion 23, arc groove 24.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Referring to fig. 1 to 3, as shown in fig. 1 and 3, an arc-shaped groove 24 is formed in the stator punching single body 2, and the arc-shaped groove 24 is used for reducing deformation generated in a machining process.
Preferably, an arc-shaped portion 23 is arranged on the lower portion of the stator punching sheet single body 2, and the arc-shaped portion 23 is used for ensuring that the motor has a normal sine wave.
Preferably, one side of the stator punching sheet single body 2 is provided with a positioning bulge 21, and the positioning bulge 21 is used for improving the accuracy in installation.
Preferably, a positioning groove 22 is formed in the other side of the stator punching sheet single body 2, and the positioning groove 22 is used for improving the accuracy in installation.
As shown in fig. 2, according to the stator punching provided by the invention, the stator punching 1 comprises a plurality of stator punching monomers 2, and the plurality of stator punching monomers 2 are annularly connected end to end in sequence to form the stator punching 1.
Preferably, the positioning groove 22 is received in the positioning protrusion 21 at an adjacent position.
Preferably, the number of the stator punching single bodies 2 is twelve, and the stator punching single bodies 2 are used for winding enameled wires, so that a magnetic field is formed.
The motor stator provided by the invention is formed by stacking a plurality of stator punching sheets 1, and has the advantages of high energy consumption and high efficiency.
Permanent magnet magnetic circuit calculation
A three-dimensional alternating magnetic field exists in the permanent magnet motor, in order to simplify calculation, the unevenly distributed magnetic field actually existing in space is converted into equivalent multi-section magnetic circuits, and the magnetic flux is approximately considered to be evenly distributed along the section and the length in each section of magnetic circuit. And converting the calculation of the magnetic field into the calculation of the magnetic circuit. For more accuracy, the corrections can be made using finite element numerical calculations.
The calculation formula of the residual magnetic induction B is as follows:
B＝Bir-uru0H
multiplying the two sides of the above formula by the cross-sectional area of the magnetic flux of each pole to obtain:
Φm＝Φr-Φ0
referring to fig. 5, where Φ r is the virtual intrinsic flux of the permanent magnet, Φ 0 is the virtual leakage flux of the permanent magnet, Φ m is the total flux per pole provided by the permanent magnet to the external magnetic circuit, Φ δ is the main flux of the armature winding linkage, and Φ σ is the leakage flux not to the winding linkage. Fa is the load armature magnetomotive force and is zero at no load. And the lambda 0, the lambda delta and the lambda sigma are respectively an internal magnetic conductance, a main magnetic conductance and a leakage magnetic conductance. For the convenience of analysis and calculation, Thevenin theorem transformation can be applied, and the equivalent external magnetic conductance is as follows:
Λ'＝Λδ+Λσ＝Λn＝kσΛδ
optimum working point of permanent magnet
In designing a permanent magnet motor, in order to take full advantage of the permanent magnet material and reduce the size of the permanent magnets and the overall motor, it is desirable to establish a magnetic field with maximum magnetic energy in the air gap with a minimum permanent magnet volume. Since the permanent magnet motor has leakage flux, an effective magnetic energy product actually participating in electromechanical energy conversion needs to be considered, as shown in fig. 6.
2 the effective magnetic energy product is proportional to the area of the quadrilateral ABB 'A', and in order to maximize its area, the optimum working point of the permanent magnet should be phirMidpoint A of K. Programming
From the given parameters, the magnetic circuit and the electric circuit are analyzed, and the design steps are shown in fig. 7.
2.1 permanent magnet parameters
From the dimensional data of the motor, the pitch and the pole pitch can be calculated:
pitch: t is t1＝π·Di1/Q＝6.45mm
Polar distance: tau is1＝π·Di1/2/P＝38.75mm
Relative recoil permeability of permanent magnet:
magnetic shoe central angle: thetap＝αp·360°/2/P＝50°
Average width of magnet: bm＝π·(D2+hm)·αp/2/P＝29.33mm
Total volume of permanent magnet: vm＝2·P·bm·hm·Lm＝3.08×104mm3
2.2 stator-rotor punching sheet
Tooth height: h ist1＝h01+h12＝15mm
The upper part of the groove is wide: b1＝π·(Di1+2·h01)/Q-bt1＝3.60mm
The width of the bottom of the groove: b2＝π·(Di1+2·h01+2·h12)/Q-bt1＝6.08mm
Area of groove：As＝(b1+b2)·h12/2＝68.68mm2
Stator yoke height: h isj1＝(D1-Di1)/2-h01-h12＝12mm
Average magnetic path length of stator yoke: l isj1＝π·(D1-hj1)·(1-αp/2)/P/2+hj1＝47.53mm
Rotor yoke height: h isj2＝(D2-Di2)/2＝19mm
Average magnetic path length of rotor yoke: l isj2＝π·(D2-hj2)·(1-αp/2)/P/2+hj2＝32.78mm
The effect of notching on the equivalent air gap is generally measured by the air gap coefficient:
kδ＝t1·(4.4·δ+0.75·b01)/(t1·(4.4·δ+0.75·b01)-b01 2)＝1.10
2.3 winding parameter calculation
Number of turns of series conductor per phase:
N＝Ns*Q/2*m*a
area of the wire:
Sd＝2×π×(r/2)2
current density:
J＝IN/Sd
groove insulation area:
Ai＝Ci*(2×h12+b2)
effective area of the groove:
Aef＝As-Ai
the groove fullness rate:
Sf＝Ns×2×(2×r+hd)2/Aef
polar distance:
Tao＝Q/2P
winding short pitch coefficient:
Ky1＝sin(y*pi/2*Tao)
number of phase slots per pole:
q＝Q/2Pm
winding distribution coefficient:
Kq1＝sin(q*α/2)/q*sin(α/2)
wherein:
α＝2πP/Q
oblique electric angle
β＝30o
The ramp (trough) factor is:
Ksk1＝2*sin(β/2)/β
winding coefficient:
Kdp＝Kq1*Ky1*Ksk1
the length of the coil is half of that of a winding former:
Lav＝0.078+0.040
average length of one end of the coil:
Le＝0.040+0.078-0.050
actual electrical load:
A1＝Ns*Q*IN/(2*a*π*Di1)
2.4 magnetic path calculation
Air gap form factor: (ratio of amplitude of flux density fundamental wave of no-load air gap to flux density of air gap)
Kf＝4*sin(αi*π/2)/π
Air gap flux form factor: (ratio of fundamental flux to total flux of air gap)
Kfai＝8*sin(αi*π/2)/αiπ2
No-load magnetic flux leakage coefficient:
kσ＝1.2
the next step is to check the permanent magnet operating point bm 0:
if 0.5< bm0< 0.9;
main magnetic flux of no-load air gap:
Фδ0＝bm0*Br*Am/kσ
air gap flux density:
Bδ＝Фδ0/αi*σ1*Lef
air gap magnetic potential difference:
Fδ＝2*kδ*δ*Bδ/μ0
stator tooth magnetic density:
Bt1＝t1*Lef*Bδ/bt1*L1*Kfe
if Bt1>1.8
The output is false (Bt1 too large)
Ht1 is obtained by table lookup
Magnetic potential difference of stator teeth
Ft1＝2*Ht1*ht1
Magnetic density of stator yoke
Bj1＝Фδ0/2*L1*Kfe*hj1
If Bj1 is greater than 1.8, the magnetic flux density is too large, the program reports error, otherwise
The magnetic field strength Hj1 of the stator yoke can be obtained by looking up the table
Magnetic potential difference of stator yoke
Fj1＝Hj1*Lj1
Magnetic flux density of rotor yoke
Bj2＝Фδ0/2*L1*Kfe*hj2
If Bj2 is greater than 1.8, the magnetic flux density is too large, the program reports error, otherwise
The magnetic field strength Hj2 of the yoke part of the rotor can be obtained by looking up the table
Magnetic potential difference of rotor yoke
Fj2＝Hj2*Lj2
Total magnetic potential difference
Ftotal＝Fδ+Ft1+Fj1+Fj2
Magnetic saturation coefficient
Kst＝(Fδ+Ft1)/Fδ
Main magnetic guide
Lamδ＝Фδ0/Ftotal
Magnetic conductance basic value
Lamb＝Br*Am/2*Hc*hm
Main magnetic conductance per unit value
lamδ＝Lamδ/Lamb
External magnetic path total magnetic conductance per unit
lamn＝kσ*lamδ
Magnetic leakage guiding unit
lamσ＝(kσ-1)*lamδ
Actual working point of permanent magnet
bm01＝lamn/(lamn+1)
Given error range
errbm＝abs((bm01-bm0)/bm0)
And if the errbm is less than 0.0007, the working point of the permanent magnet is obtained, otherwise, the circulation is continued.
Air gap flux density fundamental amplitude:
Bδ1＝Kf*Bδ
no-load counter potential:
E0＝4.44*f*Kdp*N*Фδ0*KФ
stator line load effective value:
A1rms＝m*N*IN*Kdp/P*σ1
the maximum electromagnetic torque is as follows by adopting a stator current directional control technology:
Temmax＝1.414*π*Bδ1*Lef*Di12*A1rms/4
2.5 parameter calculation
Stator resistance:
R1＝ρ*2*Lav*N/a*Sd
leakage reactance coefficient:
Cx＝4*π*f*μ0*Lef*(Kdp*N)2/P
calculating the leakage reactance of the stator:
lams1＝(3*2*h12/4*3*(b1+b2)+h12/4*b 1+h01/b01)* Kdp2/q
groove leakage reactance:
Xs1＝2*P*m*L1*lams1*Cx/Lef*Kdp2*Q
harmonic leakage reactance:
Xd1＝m*σ1*0.025*Cx/π2*kδ*δ*Kdp2*Kst
end leakage reactance:
Xe1＝0.2*Le*Cx/Lef*Kdp2
stator leakage reactance:
X1＝Xs1+Xd1+Xe1
the quadrature axis reactance, namely the dominant reactance of the non-salient pole machine, is solved, firstly, the magnetic flux is assumed, the magnetic potential is obtained, the corresponding electromotive force and current are respectively obtained, and the synchronous reactive reactance is obtained by dividing the electromotive force and the current, namely, the leakage reactance is added to the dominant reactance.
Φaq＝0.3*Фδ0
Bδaq＝Φaq/αi*σ1*Lef
Fδaq＝2*kδ*(δ+hm)*Bδaq/μ0
Bt1aq＝t1*Lef*Bδaq/bt1*L1*Kfe
Stator tooth magnetic field intensity Ht1aq is calculated by using a table lookup method
Ft1aq＝2*Ht1aq*ht1
Bj1aq＝Φaq/2*L1*Kfe*hj1
Calculating stator yoke magnetic field intensity Hj1aq by using table lookup method
Fj1aq＝Hj1aq*Lj1
Bj2aq＝Φaq/2*L1*Kfe*hj2
Calculating magnetic field intensity Hj2aq of rotor yoke by using table lookup method
Fj2aq＝Hj2aq*Lj2
Ftotalaq＝Fδaq+Ft1aq+Fj1aq+Fj2aq
Iq＝P*Ftotalaq*Kf/0.9*m*Kdp*N
Eaq＝Φaq*E0/Фδ0
Xaq＝Eaq/Iq
Xad＝Xaq
Xt＝Xaq+X1
2.6 Performance calculations
Total volume of copper:
Vcu＝2*Lav*N*Sd
the total mass of copper:
mcu＝Vcu*8900
total volume of silicon steel sheet:
Vfe＝(pi*(D2/2)2-pi*(Di2/2)2-pi*6*0.00652-pi*6*0.0032
+((2*D1-hj1)/2)*pi*hj1+Q*bt1*ht1)*L1
total mass of silicon steel sheet:
m fe＝Vfe*7700
the mass of the permanent magnet is as follows:
my＝Vm*7400
copper consumption:
pcu＝m*IN2*R1
load air gap back emf:
Eδ＝sqrt(E02+(IN*Xaq)2)
load air gap flux:
Фδd＝Eδ/4.44*f*Kdp*N*KΦ
load air gap flux density:
Bδd＝Фδd/αi*σ1*Lef
load tooth magnetic density:
Bt1d＝Bδd*t1*Lef/bt1*Kfe*L1
and (3) magnetic density of a yoke part:
Bj1d＝Фδd/2*L1*Kfe*hj1
the iron losses pt1d and pj1d of the stator teeth and the stator yoke are obtained by a lookup table
Calculating the volume of the stator teeth:
Vt1＝Q*L1*Kfe*ht1*bt1
volume of stator yoke:
Vj1＝π*L1*Kfe*hj1*(D1-hj1)
iron loss:
pfe＝(2.5*pt1d*Vt1+2*pj1d*Vj1)*7750
output power:
PN1＝nN*Temmax*0.1047
stray loss:
pm＝0.04*PN1
actual efficiency:
Eff1＝PN1/(PN1+pcu+pfe+pm)
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 to the embodiment of the present invention 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 (8)
1. The stator punching sheet monomer is characterized in that an arc-shaped groove (24) is formed in the stator punching sheet monomer (2), and the arc-shaped groove (24) is used for reducing deformation generated in the machining process.
2. The single stator punching sheet according to claim 1, wherein an arc-shaped portion (23) is arranged on a lower portion of the single stator punching sheet (2), and the arc-shaped portion (23) is used for ensuring that a motor has a normal sine wave.
3. The single stator punching sheet according to claim 1, wherein a positioning protrusion (21) is arranged on one side of the single stator punching sheet (2), and the positioning protrusion (21) is used for improving the accuracy in installation.
4. The single stator punching sheet according to claim 1, wherein a positioning groove (22) is formed in the other side of the single stator punching sheet (2), and the positioning groove (22) is used for improving the accuracy in installation.
5. The stator punching sheet is characterized in that the stator punching sheet (1) comprises a plurality of stator punching sheet single bodies (2) according to any one of claims 1 to 4, and the plurality of stator punching sheet single bodies (2) are annularly connected end to end in sequence to form the stator punching sheet (1) together.
6. The stator punching sheet according to claim 5, wherein the positioning groove (22) is accommodated in the positioning protrusion (21) at an adjacent position.
7. The stator punching according to claim 6, characterized in that the number of the stator punching single bodies (2) is twelve, and the stator punching single bodies (2) are used for winding enameled wires so as to form a magnetic field.
8. A motor stator, characterized in that the motor stator is formed by stacking a plurality of stator laminations (1) as claimed in claim 4.
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| CN202011068089.7A CN112688443A (en) | 2020-10-08 | 2020-10-08 | Stator punching sheet monomer, stator punching sheet and motor stator |
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