电容运转电机启动问题

soft

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

soft

补充一下，转子用的合金铝。

haililihai01

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

soft

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。

cai4444

2D分析怎么看结果？ 波形？