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。 本帖最后由 我叫白小飞 于 2017-11-29 20:42 编辑
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
只有2.5Hz？ 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 你做的不是电机是软件做电机 lizhen2979371 发表于 2017-11-29 21:12
只有2.5Hz？
给的参数额定力矩4500N/m 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 发表于 2017-11-29 23:23
给的参数额定力矩4500N/m
额定转速是15rpm 反电动势设计的太低了啊。 这是低速大力矩啊，是不是体积有点小啊？ 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？ 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。 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。 4楼的已经把问题指出来了 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？ 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。 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。
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