【走进科学】电机效率死都提不上去的原因是什么？？
1）求助！下列数据为永磁同步发电机在RMxprt中的电磁设计清单，请大神们帮忙看看yc_face312）顺便讨论一下：设计电机除看效率以外，还有什么设计指标来评价所设计电机的性能，即电机设计的好不好？
电机小白，请大神们轻拍，感谢。yc_face19
额定电流2.1A,额定转矩11NM。
PERMANENT MAGNET SYNCHRONOUS GENERATOR DESIGN
File: Setup1.res
GENERAL DATA
Rated Output Power (kW): 0.208
Rated Power Factor: 0.9
Power Factor Type: Inductive
Rated Voltage (V): 63.7
Number of Poles: 16
Frequency (Hz): 26.6667
Frictional Loss (W): 2
Windage Loss (W): 2
Rotor Position: Inner
Operating Temperature (C): 75
Type of Circuit: Y3
Operation Type: Individual Machine
Domain: Time
STATOR DATA
Number of Stator Slots: 90
Outer Diameter of Stator (mm): 197
Inner Diameter of Stator (mm): 162
Type of Stator Slot: 2
Stator Slot
hs0 (mm): 1
hs1 (mm): 2.6
hs2 (mm): 5
bs0 (mm): 0.8
bs1 (mm): 2.3
bs2 (mm): 2.6
Top Tooth Width (mm): 3.60633
Bottom Tooth Width (mm): 3.6555
Skew Width (Number of Slots): 0
Length of Stator Core (mm): 250
Stacking Factor of Stator Core: 0.95
Type of Steel: D23_50
Designed Wedge Thickness (mm): 2.49204
Slot Insulation Thickness (mm): 0.2
Layer Insulation Thickness (mm): 0.2
End Length Adjustment (mm): 2
Number of Parallel Branches: 2
Number of Conductors per Slot: 8
Type of Coils: 21
Average Coil Pitch: 6
Number of Wires per Conductor: 19
Wire Diameter (mm): 0.19
Wire Wrap Thickness (mm): 0.05
Slot Area (mm^2): 19.7346
Net Slot Area (mm^2): 10.9818
Limited Slot Fill Factor (%): 80
Stator Slot Fill Factor (%): 79.7243
Coil Half-Turn Length (mm): 300.178
ROTOR DATA
Minimum Air Gap (mm): 1
Inner Diameter (mm): 132
Length of Rotor (mm): 250
Stacking Factor of Iron Core: 0.95
Type of Steel: D23_50
Polar Arc Radius (mm): 80
Mechanical Pole Embrace: 0.8
Electrical Pole Embrace: 0.788473
Max. Thickness of Magnet (mm): 6
Width of Magnet (mm): 24.1903
Type of Magnet: NdFe35
Type of Rotor: 1
Magnetic Shaft: Yes
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): 0.877081
Recoil Residual Flux Density (Tesla): 1.23
Recoil Coercive Force (kA/m): 890
MATERIAL CONSUMPTION
Armature Copper Density (kg/m^3): 8900
Permanent Magnet Density (kg/m^3): 7400
Armature Core Steel Density (kg/m^3): 7820
Rotor Core Steel Density (kg/m^3): 7820
Armature Copper Weight (kg): 1.03622
Permanent Magnet Weight (kg): 4.29619
Armature Core Steel Weight (kg): 15.0296
Rotor Core Steel Weight (kg): 6.53489
Total Net Weight (kg): 26.8969
Armature Core Steel Consumption (kg): 41.0306
Rotor Core Steel Consumption (kg): 33.2594
STEADY STATE PARAMETERS
Stator Winding Factor: 0.949891
D-Axis Reactive Reactance Xad (ohm): 0.0590953
Q-Axis Reactive Reactance Xaq (ohm): 0.0590953
D-Axis Reactance X1+Xad (ohm): 0.166857
Q-Axis Reactance X1+Xaq (ohm): 0.166857
Armature Leakage Reactance X1 (ohm): 0.107761
Zero-Sequence Reactance X0 (ohm): 0.0922098
Armature Phase Resistance R1 (ohm): 0.725502
Armature Phase Resistance at 20C (ohm): 0.596784
NO-LOAD MAGNETIC DATA
Stator-Teeth Flux Density (Tesla): 1.60463
Stator-Yoke Flux Density (Tesla): 1.60831
Rotor-Yoke Flux Density (Tesla): 1.61501
Air-Gap Flux Density (Tesla): 0.971015
Magnet Flux Density (Tesla): 1.02963
Stator-Teeth By-Pass Factor: 0.0022773
Stator-Yoke By-Pass Factor: 0.000179449
Rotor-Yoke By-Pass Factor: 0.0001842
Stator-Teeth Ampere Turns (A.T): 30.6115
Stator-Yoke Ampere Turns (A.T): 22.5381
Rotor-Yoke Ampere Turns (A.T): 17.363
Air-Gap Ampere Turns (A.T): 799.75
Magnet Ampere Turns (A.T): -869.901
Leakage-Flux Factor: 1
Correction Factor for Magnetic
Circuit Length of Stator Yoke: 0.301447
Correction Factor for Magnetic
Circuit Length of Roor Yoke: 0.298015
Fundamental Induced RMS Line Voltage (V): 68.7653
THD of Induced Voltage (%): 0.590333
Cogging Torque (N.m): 0.0467789
FULL-LOAD DATA
Load Resistance (ohm): 15.8007
Load Inductance (H): 0.0456732
Load Line Voltage (V): 66.0338
RMS Line Current (A): 2.16414
RMS Phase Current (A): 2.16414
RMS Phase Voltage (V): 38.3999
Armature Thermal Load (A^2/mm^3): 3.07487
Specific Electric Loading (A/mm): 1.53081
Armature Current Density (A/mm^2): 2.00865
Frictional and Windage Loss (W): 4
Iron-Core Loss (W): 35.0628
Armature Copper Loss (W): 10.1936
Total Loss (W): 49.2564
Output Power (W): 187.903
Input Power (W): 237.159
Efficiency (%): 79.2307
Apparent Power (VA): 249.308
Power Factor: 0.753699
Synchronous Speed (rpm): 200
Rated Torque (N.m): 11.3235
Short Circuit Current (A): 53.1975
WINDING ARRANGEMENT
The 3-phase, 2-layer winding can be arranged in 45 slots as below:
AAZZBBXXCCYYAAZBBXXCCYYAAZZBBXCCYYAAZZBBXXCCY
Angle per slot (elec. degrees): 32
Phase-A axis (elec. degrees): 124
First slot center (elec. degrees): 0
TRANSIENT FEA INPUT DATA
For Armature Winding:
Number of Turns: 120
Parallel Branches: 2
Terminal Resistance (ohm): 0.725502
End Leakage Inductance (H): 1.25259e-005
2D Equivalent Value:
Equivalent Model Depth (mm): 250
Equivalent Stator Stacking Factor: 0.95
Equivalent Rotor Stacking Factor: 0.95
Equivalent Br (Tesla): 1.23
Equivalent Hc (kA/m): 890
Estimated Rotor Inertia (kg m^2): 0.125463
Inner Diameter (mm): 132
Length of Rotor (mm): 250
你这铁芯设计的不合理 这个尺寸大了
Armature Thermal Load (A^2/mm^3): 3.07487
热负荷太低，材料利用率低 Air-Gap Flux Density (Tesla): 0.971015
气隙磁密有点太高了 被标题吸引了。。。 zptonghua 发表于 2016-12-20 22:25
Inner Diameter (mm): 132
Length of Rotor (mm): 250
你这铁芯设计的不合理 这个尺寸 ...
照你说的改了下。热负荷最多能提到8，功率也卡在80%左右，怎么进一步提高热负荷呢？
Nephology 发表于 2016-12-21 08:16
Air-Gap Flux Density (Tesla): 0.971015
气隙磁密有点太高了
改了一下。提高了热负荷，降了气隙磁密，效率还是最多就80%。
请问还有什么可以改进的地方吗？
加大气隙增加绕组匝数试试， Iron loss佔總功率的15％
改鐵芯型狀降鐵芯上的磁通密度、改鐵芯材料是比較快的做法 200多瓦的电机，外径做190，叠厚做250？定子槽数还90槽。。。。
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