为什么用RMxprt设计三相异步电机，功率偏低

abcd515239632

Y2-8012-0.75KW-220/380V-50HZ电机

RMxprt计算单
             Three-Phase Induction Machine Design

                      File: Setup1.res

     GENERAL DATA

Given Output Power (kW):        0.75
Rated Voltage (V):        380
Winding Connection:        Wye
Number of Poles:        2
Given Speed (rpm):        2850
Frequency (Hz):        50
Stray Loss (W):        5.025
Frictional Loss (W):        0
Windage Loss (W):        0
Operation Mode:        Motor
Type of Load:        Constant Power
Operating Temperature (C):        75

     STATOR DATA

Number of Stator Slots:        18
Outer Diameter of Stator (mm):          120
Inner Diameter of Stator (mm):          67
Type of Stator Slot:        2
Stator Slot       
            hs0 (mm):          0.5
            hs1 (mm):          1.355
            hs2 (mm):          5.145
            bs0 (mm):          2.5
            bs1 (mm):          7.2
            bs2 (mm):          9
Top Tooth Width (mm):          5.17994
Bottom Tooth Width (mm):          5.19413

Length of Stator Core (mm):          60
Stacking Factor of Stator Core:        0.95
Type of Steel:        D23_50
Number of lamination sectors        0
Press board thickness (mm):          0
Magnetic press board        No
Number of Parallel Branches:        1
Type of Coils:        10
Coil Pitch:        0
Number of Conductors per Slot:        109
Number of Wires per Conductor:        1
Wire Diameter (mm):        0.6
Wire Wrap Thickness (mm):        0.07

Wedge Thickness (mm):        2
Slot Liner Thickness (mm):        0.25
Layer Insulation (mm):        0
Slot Area (mm^2):        81.3049
Net Slot Area (mm^2):        59.2351

Slot Fill Factor (%):        82.6033
Limited Slot Fill Factor (%):        75
**** Warning - Result is Unfeasable ****
  Slot Fill Factor is beyond its limited value.
Wire Resistivity (ohm.mm^2/m):        0.0217
Conductor Length Adjustment (mm):          15
End Length Correction Factor        1
End Leakage Reactance Correction Factor        1

     ROTOR DATA

Number of Rotor Slots:        16
Air Gap (mm):          0.3
Inner Diameter of Rotor (mm):          26
Type of Rotor Slot:        2
Rotor Slot       
            hs0 (mm):          0.5
            hs1 (mm):          1.587
            hs2 (mm):          9.71
            bs0 (mm):          1
            bs1 (mm):          6.5
            bs2 (mm):          2.8
Cast Rotor:        No
Half Slot:        No

Length of Rotor (mm):          60
Stacking Factor of Rotor Core:        0.95
Type of Steel:        D23_50
Skew Width:        1.125
End Length of Bar (mm):          0
Height of End Ring (mm):          13.5
Width of End Ring (mm):          12
Resistivity of Rotor Bar       
  at 75 Centigrade (ohm.mm^2/m):        0.0263158
Resistivity of Rotor Ring       
  at 75 Centigrade (ohm.mm^2/m):        0.0263158
Magnetic Shaft:        No

     MATERIAL CONSUMPTION

Armature Copper Density (kg/m^3):          8900
Rotor Bar Material Density (kg/m^3):          2689
Rotor Ring Material Density (kg/m^3):          2689
Armature Core Steel Density (kg/m^3):          7820
Rotor Core Steel Density (kg/m^3):          7820

Armature Copper Weight (kg):          1.12459
Rotor Bar Material Weight (kg):          0.141157
Rotor Ring Material Weight (kg):          0.142054
Armature Core Steel Weight (kg):          2.81734
Rotor Core Steel Weight (kg):          0.916867
Total Net Weight (kg):          5.14201

Armature Core Steel Consumption (kg):          5.17208
Rotor Core Steel Consumption (kg):          1.57152

     RATED-LOAD OPERATION

Stator Resistance (ohm):        11.433
Stator Resistance at 20C (ohm):        9.40453
Stator Leakage Reactance (ohm):        48.6687
Rotor Resistance (ohm):        3.95262
Rotor Resistance at 20C (ohm):        3.25135
Rotor Leakage Reactance (ohm):        6.44968
Resistance Corresponding to       
  Iron-Core Loss (ohm):        3939.97
Magnetizing Reactance (ohm):        171.011

Stator Phase Current (A):        2.3536
Current Corresponding to       
  Iron-Core Loss (A):        0.0321885
Magnetizing Current (A):        0.741601
Rotor Phase Current (A):        2.12418

Copper Loss of Stator Winding (W):        189.997
Copper Loss of Rotor Winding (W):        53.5044
Iron-Core Loss (W):        12.2466
Frictional and Windage Loss (W):        0
Stray Loss (W):        5.025
Total Loss (W):        260.773
Input Power (kW):        1.01072
Output Power (kW):        0.749942

Mechanical Shaft Torque (N.m):        2.55745
Efficiency (%):        74.1992
Power Factor:        0.649212
Rated Slip:        0.0665936
Rated Shaft Speed (rpm):        2800.22

     NO-LOAD OPERATION

No-Load Stator Resistance (ohm):        11.433
No-Load Stator Leakage Reactance (ohm):        49.029
No-Load Rotor Resistance (ohm):        3.95226
No-Load Rotor Leakage Reactance (ohm):        6.56048

No-Load Stator Phase Current (A):        0.99487
No-Load Iron-Core Loss (W):        21.9977
No-Load Input Power (W):        61.1488
No-Load Power Factor:        0.085711
No-Load Slip:        8.12911e-006
No-Load Shaft Speed (rpm):        2999.98

     BREAK-DOWN OPERATION

Break-Down Slip:        0.09
Break-Down Torque (N.m):        2.6469
Break-Down Torque Ratio:        1.03497
Break-Down Phase Current (A):        2.71132

     LOCKED-ROTOR OPERATION

Locked-Rotor Torque (N.m):        0.551601
Locked-Rotor Phase Current (A):        3.92618
Locked-Rotor Torque Ratio:        0.215684
Locked-Rotor Current Ratio:        1.66816

Locked-Rotor Stator Resistance (ohm):        11.433
Locked-Rotor Stator       
  Leakage Reactance (ohm):        47.7156
Locked-Rotor Rotor Resistance (ohm):        4.03376
Locked-Rotor Rotor       
  Leakage Reactance (ohm):        6.202

     DETAILED DATA AT RATED OPERATION

Stator Slot Leakage Reactance (ohm):        1.58089
Stator End-Winding Leakage       
  Reactance (ohm):        6.05602
Stator Differential Leakage       
  Reactance (ohm):        41.0313
Rotor Slot Leakage Reactance (ohm):        2.41147
Rotor End-Winding Leakage       
  Reactance (ohm):        0.236442
Rotor Differential Leakage       
  Reactance (ohm):        2.41419
Skewing Leakage Reactance (ohm):        1.38746

Stator Winding Factor:        0.959795

Stator-Teeth Flux Density (Tesla):        1.06595
Rotor-Teeth Flux Density (Tesla):        1.09456
Stator-Yoke Flux Density (Tesla):        0.978655
Rotor-Yoke Flux Density (Tesla):        2.16179
Air-Gap Flux Density (Tesla):        0.449187

Stator-Teeth Ampere Turns (A.T):        3.60817
Rotor-Teeth Ampere Turns (A.T):        5.71532
Stator-Yoke Ampere Turns (A.T):        20.7733
Rotor-Yoke Ampere Turns (A.T):        153.064
Air-Gap Ampere Turns (A.T):        134.444

Correction Factor for Magnetic       
  Circuit Length of Stator Yoke:        0.7
Correction Factor for Magnetic       
  Circuit Length of Rotor Yoke:        0.137729
Saturation Factor for Teeth:        1.06935
Saturation Factor for Teeth & Yoke:        2.36236
Induced-Voltage Factor:        0.578059

Stator Current Density (A/mm^2):        8.32417
Specific Electric Loading (A/mm):        21.9385
Stator Thermal Load (A^2/mm^3):        182.62

Rotor Bar Current Density (A/mm^2):        4.61463
Rotor Ring Current Density (A/mm^2):        3.95522

Half-Turn Length of       
  Stator Winding (mm):          227.779

     WINDING ARRANGEMENT

Average coil pitch is:        7.66667

Angle per slot (elec. degrees):        20
Phase-A axis (elec. degrees):        90
First slot center (elec. degrees):        0


Sorry, the winding cannot be arranged symmetrically.

  The winding factors of each phase are:
    Phase A        0.959795
    Phase B        0.333333
    Phase C        0.333333

  The angles between two-phase winding axes are:
    Phase A & B        60
    Phase B & C        240
    Phase C & A        60

  If a sinusoidal rotating field links the winding,
  the fundamental induced-voltage components will be:
    Positive-sequence component        100%
    Negative-sequence component        22.6682%
    Zero-sequence component        100%


     TRANSIENT FEA INPUT DATA

For one phase of the Stator Winding:
  Number of Turns:        327
  Parallel Branches:        1
  Terminal Resistance (ohm):        11.433
  End Leakage Inductance (H):        0.0192769
For Rotor End Ring Between Two Bars of One Side:
  Equivalent Ring Resistance (ohm):        1.65538e-006
  Equivalent Ring Inductance (H):        5.29452e-009
2D Equivalent Value:
  Equivalent Model Depth (mm):        60
  Equivalent Stator Stacking Factor:        0.95
  Equivalent Rotor Stacking Factor:        0.95
Estimated Rotor Inertial Moment (kg m^2):        0.000893137
帮忙看下哪里错了  导致功率因数偏低

abcd515239632

上科所软件计算单

abcd515239632

Y2-8012-0.75KW-220/380V-50HZ用RMxprt设计工程文件 ，谁帮忙看下 哪里错了

思秦画意

我用RMxprt也遇到问题，跟书上的案例对不上结果，而且误差很大。新手

cai4444

额定输出都是750W
ANSOFT:输入1000W，效率75%
上科所 1.3058（倍输出标么值，也就是1.3058x750w=979W）效率76%
功率差不多吧
至于功率因数相差较大：ANSOFT 0.65 上科0.83.原因1 矽钢片明显不同，原因2ANSFT节距是第10型手动设计，自动设计是第11型，按同心式最大节距，而上科是7.76平均节距

xiangsuo

请问你在RMxprt中怎么查看功率因数的，在Maxwell2D中能否查看，如果不能，那要怎样才能计算呢？？？谢谢

tztcl001

主要是功率因数差别较大，计算方不一致

tztcl001

我试了好多规格，特别是2极异步电机的性能计算差别最大

haiyucocolee

这种小电机绕组连接方式要注意，rm里只有一种连接方式，确定两者是否一样，会有一点差别但不会有这么大

wangjs

但ANSOFT计算的功率因数更准确一些，我曾和试验数据对照过

chiyanhu

ansoft用的是哪个版本号呢，用新一点的版本如19.2是不是会不一样

benyulwj

计算单，仅看功因差别大，没看启动转矩与启动电流，与上科所计算的差别更大。我也遇到同样的情况，不知道什么原因。

alanturing

我用ansys2019R1和哈理工计算的结果比较过，rmxprt算出来的结果中，启动电流和启动转矩比哈理工的低，也比实际要低，电流都差不多

eelachan

The winding factors of each phase are:
    Phase A        0.959795
    Phase B        0.333333-->?
    Phase C        0.333333-->?