无刷直流电机
用RMxprt对无刷直流电机进行计算分析，计算清单中显示每相电枢电阻R=0.00681976欧姆，而电枢电流为Ia=186.332A(电机额定电压Un=600V,每相管压降DU=1.5V，线感应电动势E=546V，采用三相六状态导通方式)，而按计算公式Ia=(Un-2*DU-E)/2/R计算，Ia=3739.1345A，为什么会有这么大差距啊？在手算设计时我的电枢电流和绕组线规的选择也一直有问题，不知道哪里出了差错，希望能有人帮忙解答一下~下面是我RMxprt的计算清单BRUSHLESS PERMANENT MAGNET DC MOTOR DESIGN
File: Setup1.res
GENERAL DATA
Rated Output Power (kW): 100
Rated Voltage (V): 600
Number of Poles: 4
Given Rated Speed (rpm): 30000
Frictional Loss (W): 600
Windage Loss (W): 200
Rotor Position: Inner
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): 1
One-Diode Voltage Drop (V): 0.5
Operating Temperature (C): 75
Maximum Current for CCC (A): 0
Minimum Current for CCC (A): 0
STATOR DATA
Number of Stator Slots: 6
Outer Diameter of Stator (mm): 198
Inner Diameter of Stator (mm): 122
Type of Stator Slot: 4
Stator Slot
hs0 (mm): 4
hs1 (mm): 0
hs2 (mm): 10
bs0 (mm): 3
bs1 (mm): 37
bs2 (mm): 46
rs (mm): 0.5
Top Tooth Width (mm): 32.9386
Bottom Tooth Width (mm): 35.1444
Skew Width (Number of Slots) 0
Length of Stator Core (mm): 192.5
Stacking Factor of Stator Core: 0.95
Type of Steel: D23_50
Designed Wedge Thickness (mm): 5
Slot Insulation Thickness (mm): 0.3
Layer Insulation Thickness (mm): 0.3
End Length Adjustment (mm): 70
Number of Parallel Branches: 1
Number of Conductors per Slot: 6
Type of Coils: 20
Average Coil Pitch: 1
Number of Wires per Conductor: 5
Wire Diameter (mm): 1.97
Wire Wrap Thickness (mm): 0.07
Slot Area (mm^2): 449.893
Net Slot Area (mm^2): 187.212
Limited Slot Fill Factor (%): 75
Stator Slot Fill Factor (%): 66.6881
Coil Half-Turn Length (mm): 399.135
ROTOR DATA
Minimum Air Gap (mm): 2
Inner Diameter (mm): 55
Length of Rotor (mm): 192.5
Stacking Factor of Iron Core: 0.95
Type of Steel: D23_50
Polar Arc Radius (mm): 59
Mechanical Pole Embrace: 0.8
Electrical Pole Embrace: 0.798323
Max. Thickness of Magnet (mm): 7.7
Width of Magnet (mm): 69.3035
Type of Magnet: Material1
Type of Rotor: 1
Magnetic Shaft: No
PERMANENT MAGNET DATA
Residual Flux Density (Tesla): 0.95
Coercive Force (kA/m): 740
Maximum Energy Density (kJ/m^3): 175.75
Relative Recoil Permeability: 1.02163
Demagnetized Flux Density (Tesla): 5.79834e-005
Recoil Residual Flux Density (Tesla): 0.95
Recoil Coercive Force (kA/m): 740
MATERIAL CONSUMPTION
Armature Copper Density (kg/m^3): 8900
Permanent Magnet Density (kg/m^3): 7800
Armature Core Steel Density (kg/m^3): 7820
Rotor Core Steel Density (kg/m^3): 7820
Armature Copper Weight (kg): 1.94897
Permanent Magnet Weight (kg): 3.20503
Armature Core Steel Weight (kg): 23.4555
Rotor Core Steel Weight (kg): 8.42586
Total Net Weight (kg): 37.0354
Armature Core Steel Consumption (kg): 45.2517
Rotor Core Steel Consumption (kg): 12.525
STEADY STATE PARAMETERS
Stator Winding Factor: 0.866025
D-Axis Reactive Inductance Lad (H): 1.70504e-005
Q-Axis Reactive Inductance Laq (H): 1.70504e-005
D-Axis Inductance L1+Lad(H): 5.63978e-005
Q-Axis Inductance L1+Laq(H): 5.63978e-005
Armature Leakage Inductance L1 (H): 3.93474e-005
Zero-Sequence Inductance L0 (H): 1.41836e-005
Armature Phase Resistance R1 (ohm): 0.00681976
Armature Phase Resistance at 20C (ohm): 0.0056098
D-Axis Time Constant (s): 0.00250014
Q-Axis Time Constant (s): 0.00250014
Ideal Back-EMF Constant KE (Vs/rad): 0.163088
Start Torque Constant KT (Nm/A): 0.0591956
Rated Torque Constant KT (Nm/A): 0.172047
NO-LOAD MAGNETIC DATA
Stator-Teeth Flux Density (Tesla): 1.36958
Stator-Yoke Flux Density (Tesla): 1.33885
Rotor-Yoke Flux Density (Tesla): 1.15716
Air-Gap Flux Density (Tesla): 0.670139
Magnet Flux Density (Tesla): 0.756625
Stator-Teeth By-Pass Factor: 0.0013785
Stator-Yoke By-Pass Factor: 5.19773e-005
Rotor-Yoke By-Pass Factor: 3.33974e-005
Stator-Teeth Ampere Turns (A.T): 15.0993
Stator-Yoke Ampere Turns (A.T): 31.0227
Rotor-Yoke Ampere Turns (A.T): 9.48486
Air-Gap Ampere Turns (A.T): 1104.27
Magnet Ampere Turns (A.T): -1159.84
Armature Reactive Ampere Turns
at Start Operation (A.T): 67857.2
Leakage-Flux Factor: 1
Correction Factor for Magnetic
Circuit Length of Stator Yoke: 0.439046
Correction Factor for Magnetic
Circuit Length of Rotor Yoke: 0.528494
No-Load Speed (rpm): 35319.7
Cogging Torque (N.m): 1.06336
FULL-LOAD DATA
Average Input Current (A): 186.332
Root-Mean-Square Armature Current (A): 158.923
Armature Thermal Load (A^2/mm^3): 155.659
Specific Electric Loading (A/mm): 14.9273
Armature Current Density (A/mm^2): 10.4279
Frictional and Windage Loss (W): 800.893
Iron-Core Loss (W): 10113.3
Armature Copper Loss (W): 516.732
Transistor Loss (W): 367.216
Diode Loss (W): 14.1904
Total Loss (W): 11812.3
Output Power (W): 99986.8
Input Power (W): 111799
Efficiency (%): 89.4343
Rated Speed (rpm): 30022.3
Rated Torque (N.m): 31.8031
Locked-Rotor Torque (N.m): 2590.4
Locked-Rotor Current (A): 43763.2
WINDING ARRANGEMENT
Angle per slot (elec. degrees): 120
Phase-A axis (elec. degrees): 60
First slot center (elec. degrees): 0
TRANSIENT FEA INPUT DATA
For Armature Winding:
Number of Turns: 6
Parallel Branches: 1
Terminal Resistance (ohm): 0.00681976
End Leakage Inductance (H): 9.46128e-006
2D Equivalent Value:
Equivalent Model Depth (mm): 192.5
Equivalent Stator Stacking Factor: 0.95
Equivalent Rotor Stacking Factor: 0.95
Equivalent Br (Tesla): 0.95
Equivalent Hc (kA/m): 740
Estimated Rotor Moment of Inertia (kg m^2): 0.0285794
有人可以帮忙的吗？ 多年以来一直认为rm算的有点问题，换成speed会好很多。包括之前JMAG的解析模块算出来都效果不好。 沙隆巴斯 发表于 2018-4-25 19:45
多年以来一直认为rm算的有点问题，换成speed会好很多。包括之前JMAG的解析模块算出来都效果不好。
speed是什么软件啊，不好意思，刚接触电机设计不久，对这些不太了解 无厘头 发表于 2018-4-27 22:35
speed是什么软件啊，不好意思，刚接触电机设计不久，对这些不太了解
你的空载转速为什么是3万多？ 还有就是你的空载反电势电是怎么得到的？ samuelrzg22 发表于 2018-5-4 16:18
你的空载转速为什么是3万多？
额定转速是30000，空载转速30000+算是正常的吧 samuelrzg22 发表于 2018-5-4 16:19
还有就是你的空载反电势电是怎么得到的？
这个上面好像没有空载反电动势，需要自己计算吧，就我刚刚跟你说的公式 无厘头 发表于 2018-5-4 16:37
额定转速是30000，空载转速30000+算是正常的吧
我看错了，看成600了{:1_565:}
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