请教个问题，我做的永磁同步电机rmxprt计算出来的效率一直很低，是怎么回事？下面是工程文件。

我叫白小飞

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我做

的永磁同步电机rmxprt计算出来的效率一直很低，是怎么回事？下面是工程文件。

我叫白小飞

ADJUSTABLE-SPEED PERMANENT MAGNET SYNCHRONOUS MOTOR DESIGN

                      File: Setup3.res


     GENERAL DATA

Rated Output Power (kW):        7.07
Rated Voltage (V):        380
Number of Poles:        20
Frequency (Hz):        2.5
Frictional Loss (W):        130
Windage Loss (W):        0
Rotor Position:        Inner
Type of Circuit:        Y3
Type of Source:        Sine
Domain:        Time
Operating Temperature (C):        75


     STATOR DATA

Number of Stator Slots:        60
Outer Diameter of Stator (mm):          423
Inner Diameter of Stator (mm):          378

Type of Stator Slot:        1
Stator Slot       
            hs0 (mm):          0.8
            hs2 (mm):          2.90209
            bs0 (mm):          4
            bs1 (mm):          10.4471
            bs2 (mm):          10.7513
Top Tooth Width (mm):          9.9379
Bottom Tooth Width (mm):          9.9379
Skew Width (Number of Slots):        0

Length of Stator Core (mm):          220
Stacking Factor of Stator Core:        0.95
Type of Steel:        DW315_50
Designed Wedge Thickness (mm):          1.54102
Slot Insulation Thickness (mm):          0.3
Layer Insulation Thickness (mm):          0.3
End Length Adjustment (mm):          0
Number of Parallel Branches:        2
Number of Conductors per Slot:        24
Type of Coils:        21
Average Coil Pitch:        5
Number of Wires per Conductor:        1
Wire Diameter (mm):          1.628
Wire Wrap Thickness (mm):          0
Slot Area (mm^2):        121.143
Net Slot Area (mm^2):        91.2318
Limited Slot Fill Factor (%):        75
Stator Slot Fill Factor (%):        69.7226
Coil Half-Turn Length (mm):          347.687
Wire Resistivity (ohm.mm^2/m):        0.0217


     ROTOR DATA

Minimum Air Gap (mm):          1
Inner Diameter (mm):          115
Length of Rotor (mm):          220
Stacking Factor of Iron Core:        0.95
Type of Steel:        DW315_50
Polar Arc Radius (mm):          188
Mechanical Pole Embrace:        0.7
Electrical Pole Embrace:        0.699946
Max. Thickness of Magnet (mm):          3.5
Width of Magnet (mm):          40.9585
Type of Magnet:        NdFe35
Type of Rotor:        1
Magnetic Shaft:        No


     PERMANENT MAGNET DATA

Residual Flux Density (Tesla):        1.23
Coercive Force (kA/m):        890
Maximum Energy Density (kJ/m^3):        273.675
Relative Recoil Permeability:        1.09981
Demagnetized Flux Density (Tesla):        0
Recoil Residual Flux Density (Tesla):        1.23
Recoil Coercive Force (kA/m):        890

     MATERIAL CONSUMPTION

Armature Wire Density (kg/m^3):          8900
Permanent Magnet Density (kg/m^3):          7400
Armature Core Steel Density (kg/m^3):          7600
Rotor Core Steel Density (kg/m^3):          7600

Armature Copper Weight (kg):          9.27556
Permanent Magnet Weight (kg):          4.66763
Armature Core Steel Weight (kg):          33.4217
Rotor Core Steel Weight (kg):          153.366
Total Net Weight (kg):          200.731

Armature Core Steel Consumption (kg):          115.619
Rotor Core Steel Consumption (kg):          172.638


     STEADY STATE PARAMETERS

Stator Winding Factor:        0.5
D-Axis Reactive Reactance Xad (ohm):        0.0129166
Q-Axis Reactive Reactance Xaq (ohm):        0.0129166
D-Axis Reactance X1+Xad (ohm):        0.0191944
Q-Axis Reactance X1+Xaq (ohm):        0.0191944
Armature Leakage Reactance X1 (ohm):        0.00627775
Zero-Sequence Reactance X0 (ohm):        0.0150397
Armature Phase Resistance R1 (ohm):        0.434942
Armature Phase Resistance at 20C (ohm):        0.357775


     NO-LOAD MAGNETIC DATA

Stator-Teeth Flux Density (Tesla):        1.8159
Stator-Yoke Flux Density (Tesla):        1.76503
Rotor-Yoke Flux Density (Tesla):        0.14438
Air-Gap Flux Density (Tesla):        0.830726
Magnet Flux Density (Tesla):        0.850655

Stator-Teeth By-Pass Factor:        0.00963218
Stator-Yoke By-Pass Factor:        0.000461592
Rotor-Yoke By-Pass Factor:        6.42487e-006

Stator-Teeth Ampere Turns (A.T):        112.705
Stator-Yoke Ampere Turns (A.T):        99.4209
Rotor-Yoke Ampere Turns (A.T):        0.204379
Air-Gap Ampere Turns (A.T):        748.067
Magnet Ampere Turns (A.T):        -960.699

Leakage-Flux Factor:        1
Correction Factor for Magnetic
  Circuit Length of Stator Yoke:        0.31283
Correction Factor for Magnetic
  Circuit Length of Rotor Yoke:        0.766685

No-Load Line Current (A):        502.825
No-Load Input Power (W):        330035
Cogging Torque (N.m):        114.221


     FULL-LOAD DATA

Maximum Line Induced Voltage (V):        13.1384
Root-Mean-Square Line Current (A):        492.352
Root-Mean-Square Phase Current (A):        492.352
Armature Thermal Load (A^2/mm^3):        35303.2
Specific Electric Loading (A/mm):        298.515
Armature Current Density (A/mm^2):        118.262
Frictional and Windage Loss (W):        130
Iron-Core Loss (W):        2.53061
Armature Copper Loss (W):        316303
Total Loss (W):        316436
Output Power (W):        7072.35
Input Power (W):        323508
Efficiency (%):        2.18614

Synchronous Speed (rpm):        15
Rated Torque (N.m):        4502.4
Torque Angle (degree):        -19.2665

Maximum Output Power (W):        7294.2
Torque Constant KT (Nm/A):        9.31276


     WINDING ARRANGEMENT

The 3-phase, 2-layer winding can be arranged in 3 slots as below:

AZB


Angle per slot (elec. degrees):        60
Phase-A axis (elec. degrees):        150
First slot center (elec. degrees):        0



     TRANSIENT FEA INPUT DATA

For Armature Winding:
  Number of Turns:        240
  Parallel Branches:        2
  Terminal Resistance (ohm):        0.434942
  End Leakage Inductance (H):        0.000116796
2D Equivalent Value:
  Equivalent Model Depth (mm):        220
  Equivalent Stator Stacking Factor:        0.95
  Equivalent Rotor Stacking Factor:        0.95
  Equivalent Br (Tesla):        1.23
  Equivalent Hc (kA/m):        890
Estimated Rotor Inertial Moment (kg m^2):        3.3672

lizhen2979371

只有2.5Hz？   

土豆烧洋芋

FULL-LOAD DATA

Maximum Line Induced Voltage (V):           13.1384       电压太低
Root-Mean-Square Line Current (A):           492.352       导致电流过大
Root-Mean-Square Phase Current (A):         492.352
Armature Thermal Load (A^2/mm^3):        35303.2       电枢热负荷过高
Specific Electric Loading (A/mm):              298.515       线负荷过高
Armature Current Density (A/mm^2):          118.262      电枢电流密度过高

土豆烧洋芋

你做的不是电机  是软件做电机

我叫白小飞

lizhen2979371 发表于 2017-11-29 21:12
只有2.5Hz？

给的参数额定力矩4500N/m

我叫白小飞

土豆烧洋芋 发表于 2017-11-29 21:18
你做的不是电机  是软件做电机

第一次搞这个，都是试着弄的。

我叫白小飞

我叫白小飞 发表于 2017-11-29 23:23
给的参数额定力矩4500N/m

额定转速是15rpm

stevenforest

反电动势设计的太低了啊。

NJNTJSB

这是低速大力矩啊，是不是体积有点小啊？

我叫白小飞

NJNTJSB 发表于 2017-11-30 08:14
这是低速大力矩啊，是不是体积有点小啊？

那这个是不是重新选取定子转子的尺寸了？

liys

刚入电机的门吧，先把电机的电、磁、力矩、功率、转速等物理关系搞清楚。

我叫白小飞

liys 发表于 2017-11-30 08:36
刚入电机的门吧，先把电机的电、磁、力矩、功率、转速等物理关系搞清楚。

嗯嗯，到定子冲片设计这就不是太懂了，定子冲片内外径的选取。

NJNTJSB

4楼的已经把问题指出来了

我叫白小飞

NJNTJSB 发表于 2017-11-30 14:59
4楼的已经把问题指出来了

嗯嗯，这个应该怎么改，能具体说下不？

NJNTJSB

这方面我也不在行，提一点建议，1、低速电机效率本来就低；2、大力矩电机体积要大一些，你选的直径有点小；3、增加铁心长度和匝数，提高反电势。

我叫白小飞

NJNTJSB 发表于 2017-12-1 08:12
这方面我也不在行，提一点建议，1、低速电机效率本来就低；2、大力矩电机体积要大一些，你选的直径有点小； ...

嗯嗯，谢谢我再试试。