电容运转电机启动问题
这两天遇到一个电容运转电机，软件计算的结果可以接受，但是样机制作出来后，空载通电，无法达到正常转速，转速极低，几十转的样子，转轴可以用手抓住。电机嵌线和接线检查，没发现错误。求指点。下面是计算结果（rmxprt）
GENERAL DATA
Rated Output Power (kW): 1.1
Rated Voltage (V): 110
Number of Poles: 2
Frequency (Hz): 50
Rated Speed (rpm): 2800
Friction and Wind Loss (W): 22
Type of Load: Constant Power
Iron Core Length (mm): 90
Stacking Factor of Iron Core: 0.95
Type of Steel: D23-50
Operating Temperature (C): 20
Rotor Position: Inner
Operation mode: Capacitor-Run Mode
Run Capacitance (uF): 55
& Its Resistance (ohm): 0.578745
Speed-Adjustment mode: No Speed-Adjustment
STATOR DATA
Number of Stator Slots: 24
Outer Diameter of Stator (mm): 128
Inner Diameter of Stator (mm): 65
Type of Stator Slot: 3
Dimension of Stator Slot
hs0 (mm): 0.88
hs1 (mm): 0.81
hs2 (mm): 11.1
bs0 (mm): 1.89
bs1 (mm): 4.71
bs2 (mm): 7.87
rs (mm): 0.9
Top Tooth Width (mm): 4.24092
Bottom Tooth Width (mm): 3.98689
Main Aux.
Type of Coils: 31 31
Coil Position: Bot Top
Conductor Length Adjustment (mm): 5 5
Number of Parallel Branches: 1 1
Number of Wires per Conductor: 4 2
Number of Conductors per Slot:
slot # 1: 19 0
slot # 2: 19 0
slot # 3: 10 19
slot # 4: 9 21
slot # 5: 7 26
slot # 6: 0 45
Main-Phase Wire Diameter (mm): 0.75
Aux.-Phase Wire Diameter (mm): 0.69
Main-Phase Wire Wrap (mm): 0.06
Aux.-Phase Wire Wrap (mm): 0.06
Slot Insulation Thickness (mm): 0.25
ROTOR DATA
Number of Rotor Slots: 28
Air Gap (mm): 0.25
Inner Diameter of Rotor (mm): 22
Type of Rotor Slot: 1
Dimension of Rotor Slot
hr0 (mm): 0.48
hr01 (mm): 0.48
hr2 (mm): 7.45
br0 (mm): 0.01
br1 (mm): 3.7
br2 (mm): 2.04
Cast Rotor: Yes
Number of Vents: 0
Vent Diameter (mm): 0
Vent Location (mm): 0
Skew Width: 1.5
End Length of Bar (mm): 0
Height of End Ring (mm): 7
Width of End Ring (mm): 10.3
Bar Resistivity (ohm.mm^2/m): 0.074
End_Ring Resistivity (ohm.mm^2/m): 0.074
MATERIAL CONSUMPTION
Armature Copper Density (kg/m^3): 8900
Rotor Bar Material Density (kg/m^3): 2700
Rotor Ring Material Density (kg/m^3): 2700
Armature Core Steel Density (kg/m^3): 7820
Rotor Core Steel Density (kg/m^3): 7820
Main Winding Copper Weight (kg): 0.924751
Auxiliary Winding Copper Weight (kg): 0.650606
Rotor Bar Material Weight (kg): 0.193178
Rotor Ring Material Weight (kg): 0.0691568
Armature Core Steel Weight (kg): 5.08697
Rotor Core Steel Weight (kg): 1.39897
Total Net Weight (kg): 8.32363
Armature Core Steel Consumption (kg): 9.25536
Rotor Core Steel Consumption (kg): 2.21865
RATED OPERATION
Main-Phase Resistance (ohm): 0.59392
Aux.-Phase Resistance (ohm): 2.33308
Main Leakage Reactance (ohm): 0.680319
Aux. Leakage Reactance (ohm): 2.69389
Rotor Resistance (ohm): 1.38134
Rotor Leakage Reactance (ohm): 0.880611
Magnetizing Reactance (ohm): 23.8309
Turn Ratio of Aux. to Main-Coil: 1.84563
Stator Line Current (A): 12.7485
Main-Phase Current (A): 9.8307
Aux.-Phase Current (A): 3.72918
Phase Shift between Main
and Aux. Currents (degrees): 45.5621
Capacitor Voltage (V): 215.825
Capacitor Loss (W): 8.0485
Copper Loss of Stator Winding (W): 89.8438
Copper Loss of Rotor Winding (W): 127.85
Iron-Core Loss (W): 32.0243
Friction & Wind Loss (W): 20.8708
Total Loss (W): 278.637
Input Power (W): 1378.15
Output Power (W): 1099.52
Mechanical Shaft Torque (N.m): 3.81631
Efficiency (%): 79.7818
Power Factor: 0.982758
Rated Slip: 0.0829167
Rated Shaft Speed (rpm): 2751.25
NO-LOAD OPERATION
Main Leakage Reactance (ohm): 0.631379
Aux. Leakage Reactance (ohm): 2.37047
Rotor Leakage Reactance (ohm): 0.721465
Magnetizing Reactance (ohm): 17.6593
No-Load Stator Line Current (A): 3.66999
No-Load Main-Phase Current (A): 5.83575
No-Load Aux.-Phase Current (A): 4.39371
Phase Shift between No-Load Main
and Aux. Currents (degrees): 143.997
No-Load Iron-Core Loss (W): 35.9568
No-Load Input Power (W): 173.826
No-Load Power Factor: 0.430583
No-Load Slip: 0.00259115
No-Load Shaft Speed (rpm): 2992.23
BREAK-DOWN OPERATION
Break-Down Slip: 0.28
Break-Down Torque (N.m): 6.43066
Break-Down Torque Ratio: 1.68505
LOCKED-ROTOR OPERATION
Locked-Rotor Torque (N.m): 1.15096
Locked-Rotor Line Current (A): 43.371
Locked-Rotor Torque Ratio: 0.30159
Locked-Rotor Current Ratio: 3.40205
Locked-Rotor Main-Phase Current (A): 44.4859
Locked-Rotor Aux.-Phase Current (A): 2.10063
Phase Shift between Locked-Rotor Main
and Aux. Currents (degrees): 123.683
DETAILED DATA AT RATED OPERATION
Main Slot Leakage Reactance (ohm): 0.223142
Main End-Winding Leakage
Reactance (ohm): 0.2682
Main Differential Leakage
Reactance (ohm): 0.188977
Aux. Slot Leakage Reactance (ohm): 0.684075
Aux. End-Winding Leakage
Reactance (ohm): 0.760977
Aux. Differential Leakage
Reactance (ohm): 1.24884
Rotor Slot Leakage Reactance (ohm): 0.36595
Rotor End-Winding Leakage
Reactance (ohm): 0.18102
Rotor Differential Leakage
Reactance (ohm): 0.101205
Skewing Leakage Reactance (ohm): 0.232437
Main-Phase Winding Factor: 0.820036
Aux.-Phase Winding Factor: 0.872638
Stator-Teeth Flux Density (Tesla): 1.52252
Rotor-Teeth Flux Density (Tesla): 1.76751
Stator-Yoke Flux Density (Tesla): 1.48825
Rotor-Yoke Flux Density (Tesla): 1.48716
Air-Gap Flux Density (Tesla): 0.688318
Stator-Teeth Ampere Turns (A.T): 27.3706
Rotor-Teeth Ampere Turns (A.T): 94.848
Stator-Yoke Ampere Turns (A.T): 80.8636
Rotor-Yoke Ampere Turns (A.T): 8.49806
Air-Gap Ampere Turns (A.T): 165.216
Correction Factor for Magnetic
Circuit Length of Stator Yoke: 0.492615
Correction Factor for Magnetic
Circuit Length of Rotor Yoke: 0.224666
Saturation Factor for Teeth: 1.73975
Saturation Factor for Teeth & Yoke: 2.28063
Induced-Voltage Factor: 0.930329
Mean Half-Turn Length of
Main-Phase Winding (mm): 229.68
Mean Half-Turn Length of
Aux.-Phase Winding (mm): 220.154
Main Winding Current Density (A/mm^2): 5.56304
Aux. Winding Current Density (A/mm^2): 4.9865
Specific Electric Loading (A/mm): 20.4326
Mean Stator Thermal Load (A^2/mm^3): 108.993
Fill-Factor Thermal-Load
(%) (A^2/mm^3)
Slot # 1 78.798 122.123
Slot # 2 78.798 122.123
Slot # 3 75.251 105.801
Slot # 4 74.660 103.744
Slot # 5 75.254 101.817
Slot # 6 80.002 98.349
TRANSIENT FEA INPUT DATA
For Main Winding:
Number of Turns: 128
Parallel Branches: 1
Terminal Resistance (ohm): 0.59392
End Leakage Inductance (H): 0.000853708
For Aux. Winding:
Number of Turns: 222
Parallel Branches: 1
Terminal Resistance (ohm): 2.33308
End Leakage Inductance (H): 0.00242226
Starting Capacitance (uF): 0
Running Capacitance (uF): 55
Switch Speed (rpm): 0
For Rotor End Ring Between Two Bars of One Side:
End Ring Resistance (ohm): 5.99037e-006
End Ring Leakage Inductance (H): 4.51591e-009
Skew Leakage Inductance (H): 5.69819e-009
2D Equivalent Value:
Equivalent Air-Gap Length (mm): 90
Equivalent Stator Stacking Factor: 0.95
Equivalent Rotor Stacking Factor: 0.95
Estimated Rotor Moment of Inertia (kg m^2): 0.00119282
补充一下，转子用的合金铝。 这种情况以前也遇到过，不是方案的问题，可能原因1、嵌线中间有个线包反包，2、运行电容连接或电容本身问题。记得后来是重新嵌线后好了 谢谢楼上的回复。您提到的问题都检查过，没有错误。今天跟同事学了一下2d分析，现学现做，应该是方案本身的问题。我用了4个路算软件，都给出的好结果，一个2d就给否定了。路算看来是真的不能令人信服了。 2D分析怎么看结果？ 波形？
页:
[1]