Maxwell与Workbench联合仿真电磁噪声 仿真结果与实验数据偏差太大
本帖最后由 逗叉派来的谜鹿 于 2016-10-14 14:31 编辑用ANSYS EM 仿真电磁噪声
8极12槽无刷直流电机 仿真结果声压级最高有100+ 但是装有电机的轴流风机 噪声测试 SPL也就50+ 按常理电机噪声40dB左右
求问各路大神 帮我提点一下关键问题点 非常非常感谢bq2_11
新手一个 可能有些地方说得很不专业 敬请谅解
下面附一些 仿真数据
电机是由rmxprt 参照实物、风机规格和用户手册生成的
电机信息
GENERAL DATA
Rated Output Power (kW): 0.096
Rated Voltage (V): 48
Number of Poles: 8
Given Rated Speed (rpm): 11500
Frictional Loss (W): 12.3214
Windage Loss (W): 5.41264
Rotor Position: Outer
Type of Load: Constant Power
Type of Circuit: Y3
Lead Angle of Trigger in Elec. Degrees: 0
Trigger Pulse Width in Elec. Degrees: 120
One-Transistor Voltage Drop (V): 2
One-Diode Voltage Drop (V): 2
Operating Temperature (C): 70
Maximum Current for CCC (A): 0
Minimum Current for CCC (A): 0
STATOR DATA
Number of Stator Slots: 12
Outer Diameter of Stator (mm): 50
Inner Diameter of Stator (mm): 18
Type of Stator Slot: 3
Stator Slot
hs0 (mm): 1
hs1 (mm): 1.35843
hs2 (mm): 6.25655
bs0 (mm): 2
bs1 (mm): 6.70575
bs2 (mm): 3.35287
rs (mm): 1
Top Tooth Width (mm): 5.23253
Bottom Tooth Width (mm): 5.23253
Skew Width (Number of Slots) 0
Length of Stator Core (mm): 13
Stacking Factor of Stator Core: 0.95
Type of Steel: DW540_50
Designed Wedge Thickness (mm): 1
Slot Insulation Thickness (mm): 0.3
Layer Insulation Thickness (mm): 0.3
End Length Adjustment (mm): 0
Number of Parallel Branches: 1
Number of Conductors per Slot: 60
Type of Coils: 21
Average Coil Pitch: 2
Number of Wires per Conductor: 1
Wire Diameter (mm): 0.31
Wire Wrap Thickness (mm): 0.06
Slot Area (mm^2): 42.3029
Net Slot Area (mm^2): 26.2987
Limited Slot Fill Factor (%): 75
Stator Slot Fill Factor (%): 31.2334
Coil Half-Turn Length (mm): 43.5042
ROTOR DATA
Minimum Air Gap (mm): 1
Outer Diameter (mm): 60
Length of Rotor (mm): 24
Stacking Factor of Iron Core: 0.95
Type of Steel: DW540_50
Polar Arc Radius (mm): 26
Mechanical Pole Embrace: 0.7
Electrical Pole Embrace: 0.693968
Max. Thickness of Magnet (mm): 3
Width of Magnet (mm): 14.1149
Type of Magnet: NdFe30
Type of Rotor: 1
Magnetic Shaft: No
PERMANENT MAGNET DATA
Residual Flux Density (Tesla): 1.1
Coercive Force (kA/m): 838
Maximum Energy Density (kJ/m^3): 230.45
Relative Recoil Permeability: 1.0446
Demagnetized Flux Density (Tesla): 0.3746
Recoil Residual Flux Density (Tesla): 1.1
Recoil Coercive Force (kA/m): 838
MATERIAL CONSUMPTION
Armature Copper Density (kg/m^3): 8900
Permanent Magnet Density (kg/m^3): 7550
Armature Core Steel Density (kg/m^3): 7750
Rotor Core Steel Density (kg/m^3): 7750
Armature Copper Weight (kg): 0.021041
Permanent Magnet Weight (kg): 0.0657491
Armature Core Steel Weight (kg): 0.114988
Rotor Core Steel Weight (kg): 0.032752
Total Net Weight (kg): 0.23453
Armature Core Steel Consumption (kg): 0.211159
Rotor Core Steel Consumption (kg): 0.31149
STEADY STATE PARAMETERS
Stator Winding Factor: 0.866025
D-Axis Reactive Inductance Lad (H): 0.000179826
Q-Axis Reactive Inductance Laq (H): 0.000179826
D-Axis Inductance L1+Lad(H): 0.000587461
Q-Axis Inductance L1+Laq(H): 0.000587461
Armature Leakage Inductance L1 (H): 0.000407635
Zero-Sequence Inductance L0 (H): 0.000170671
Armature Phase Resistance R1 (ohm): 2.95343
Armature Phase Resistance at 20C (ohm): 2.46926
D-Axis Time Constant (s): 6.08873e-005
Q-Axis Time Constant (s): 6.08873e-005
Ideal Back-EMF Constant KE (Vs/rad): 0.0863343
Start Torque Constant KT (Nm/A): 0.0860784
Rated Torque Constant KT (Nm/A): 0.0869897
NO-LOAD MAGNETIC DATA
Stator-Teeth Flux Density (Tesla): 1.83159
Stator-Yoke Flux Density (Tesla): 0.773204
Rotor-Yoke Flux Density (Tesla): 2.81377
Air-Gap Flux Density (Tesla): 0.627759
Magnet Flux Density (Tesla): 0.382053
Stator-Teeth By-Pass Factor: 0.00828268
Stator-Yoke By-Pass Factor: 8.58081e-006
Rotor-Yoke By-Pass Factor: 0.133002
Stator-Teeth Ampere Turns (A.T): 90.124
Stator-Yoke Ampere Turns (A.T): 0.402307
Rotor-Yoke Ampere Turns (A.T): 1031.26
Air-Gap Ampere Turns (A.T): 519.32
Magnet Ampere Turns (A.T): -1640.84
Armature Reactive Ampere Turns
at Start Operation (A.T): 117.195
Leakage-Flux Factor: 1
Correction Factor for Magnetic
Circuit Length of Stator Yoke: 0.826864
Correction Factor for Magnetic
Circuit Length of Rotor Yoke: 0.350737
No-Load Speed (rpm): 4789.71
Cogging Torque (N.m): 0.0225528
FULL-LOAD DATA
Note:
This motor cannot offer the given rated output power.
The following results are of the maximum output.
Average Input Current (A): 3.63779
Root-Mean-Square Armature Current (A): 2.97273
Armature Thermal Load (A^2/mm^3): 536.674
Specific Electric Loading (A/mm): 13.626
Armature Current Density (A/mm^2): 39.3861
Frictional and Windage Loss (W): 2.55459
Iron-Core Loss (W): 4.16376
Armature Copper Loss (W): 78.2996
Transistor Loss (W): 14.3878
Diode Loss (W): 0.164198
Total Loss (W): 99.57
Output Power (W): 75.0439
Input Power (W): 174.614
Efficiency (%): 42.977
Rated Speed (rpm): 2341.64
Rated Torque (N.m): 0.306032
Locked-Rotor Torque (N.m): 0.630618
Locked-Rotor Current (A): 7.44494
WINDING ARRANGEMENT
The 3-phase, 2-layer winding can be arranged in 3 slots as below:
ABC
Angle per slot (elec. degrees): 120
Phase-A axis (elec. degrees): 120
First slot center (elec. degrees): 0
TRANSIENT FEA INPUT DATA
For Armature Winding:
Number of Turns: 120
Parallel Branches: 1
Terminal Resistance (ohm): 2.95343
End Leakage Inductance (H): 0.000103903
2D Equivalent Value:
Equivalent Model Depth (mm): 13
Equivalent Stator Stacking Factor: 0.95
Equivalent Rotor Stacking Factor: 1.75385
Equivalent Br (Tesla): 2.03077
Equivalent Hc (kA/m): 838
Estimated Rotor Moment of Inertia (kg m^2): 0.000235242
本帖最后由 逗叉派来的谜鹿 于 2016-10-14 14:35 编辑
仿真数据图C:\Users\F2A85\Desktop\222 Frictional Loss (W): 12.3214
Windage Loss (W): 5.41264
这数据有问题，先调整这两个参数，具体去看计算公式，不是随便填的。
噪声测试是带风叶空载测试吗？
请上测试噪声频谱图和仿真的频谱图 254339861 发表于 2016-10-14 13:20
Frictional Loss (W): 12.3214
Windage Loss (W): 5.41264
这数据有问题，先调整这两个参 ...
设置的是12和5然后资料生成 显示了这两个数据 本帖最后由 逗叉派来的谜鹿 于 2016-10-14 15:22 编辑
254339861 发表于 2016-10-14 13:20
Frictional Loss (W): 12.3214
Windage Loss (W): 5.41264
这数据有问题，先调整这两个参 ...
嗯 噪声测试是带风页空载时的噪声
风机单体自由状态入风口1米处噪声
从目前这些信息，请先把电磁模型调整和你测试时一样的。 我记得我很你说过，外转子电机的径向力是加在转子上面，定子振动主要通过轴承传递到外壳上，由于轴承具有弹性和一定的阻尼作用，传到外壳的高频振动会明显衰减。而转子一般直接连
接到电机外壳上，相比于定子振动，转子振动更容易引起外壳的振动和噪声。 254339861 发表于 2016-10-17 12:55
我记得我很你说过，外转子电机的径向力是加在转子上面，定子振动主要通过轴承传递到外壳上，由于轴承具有弹 ...
可是我看实物，转子是连接风扇，定子连接了外壳……这样不就是定子更容易产生振动么？ 你实测的是dB A计权，而你计算结果是什么计权方式呀，这个你考虑考虑，我也是初学，进来学习讨论的。 你实测的是dB A计权，而你计算结果是什么计权方式呀，这个你考虑考虑，我也是初学，进来学习讨论的。 254339861 发表于 2016-10-17 12:55
我记得我很你说过，外转子电机的径向力是加在转子上面，定子振动主要通过轴承传递到外壳上，由于轴承具有弹 ...
你好，请问一下，workbench结构场如何看加速度的频域波形？谢谢！！
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