满载转速低，效率不高

xenetech

新作一微型电机，做了计算后发现效率提不上去了，而且满载转速打不到要求，希望大神帮忙。

   


BRUSHLESS PERMANENT MAGNET DC MOTOR DESIGN

                      File: Setup1.res


     GENERAL DATA

Rated Output Power (kW):        0.04
Rated Voltage (V):        24
Number of Poles:        4
Given Rated Speed (rpm):        2500
Frictional Loss (W):        1.30953
Windage Loss (W):        0
Rotor Position:        Inner
Type of Load:        Fan Load
Type of Circuit:        Y3
Lead Angle of Trigger in Elec. Degrees:        0
Trigger Pulse Width in Elec. Degrees:        120
One-Transistor Voltage Drop (V):        1.5
One-Diode Voltage Drop (V):        1.5
Operating Temperature (C):        75
Maximum Current for CCC (A):        5
Minimum Current for CCC (A):        1


     STATOR DATA

Number of Stator Slots:        6
Outer Diameter of Stator (mm):          55
Inner Diameter of Stator (mm):          27

Type of Stator Slot:        Edited
Symmetric Slot
            Type Info        (mm)
            1       End Width:        2
                     Arc Offset from Slot Center:        0
            2       Height:        0.5
                     Parallel Slot Width:        0
            2       Height:        1
                     End Width:        12
            2       Height:        8
                     End Width:        21
            6       Radius:        1
            1       End Width:        0
                     Arc Offset from Slot Center:        0

Top Tooth Width (mm):          4.59905
Bottom Tooth Width (mm):          4.59905
Skew Width (Number of Slots)        0

Length of Stator Core (mm):          20
Stacking Factor of Stator Core:        0.95
Type of Steel:        50WW800
Designed Wedge Thickness (mm):          0
Slot Insulation Thickness (mm):          0
Layer Insulation Thickness (mm):          0
End Length Adjustment (mm):          0
Number of Parallel Branches:        1
Number of Conductors per Slot:        74
Type of Coils:        21
Average Coil Pitch:        1
Number of Wires per Conductor:        1
Wire Diameter (mm):          1.024
Wire Wrap Thickness (mm):          0.04
Slot Area (mm^2):        160.571
Net Slot Area (mm^2):        148.899
Limited Slot Fill Factor (%):        75
Stator Slot Fill Factor (%):        56.2632
Coil Half-Turn Length (mm):          34.2904


     ROTOR DATA

Minimum Air Gap (mm):          0.4
Inner Diameter (mm):          10
Length of Rotor (mm):          22
Stacking Factor of Iron Core:        0.95
Type of Steel:        50WW800
Polar Arc Radius (mm):          13.1
Mechanical Pole Embrace:        0.7
Electrical Pole Embrace:        0.764429
Max. Thickness of Magnet (mm):          2
Width of Magnet (mm):          13.6895
Type of Magnet:        XG196/96
Type of Rotor:        2
Magnetic Shaft:        No


     PERMANENT MAGNET DATA

Residual Flux Density (Tesla):        0.96
Coercive Force (kA/m):        690
Maximum Energy Density (kJ/m^3):        183
Relative Recoil Permeability:        1
Demagnetized Flux Density (Tesla):        0.532409
Recoil Residual Flux Density (Tesla):        0.959995
Recoil Coercive Force (kA/m):        763.962

     MATERIAL CONSUMPTION

Armature Copper Density (kg/m^3):          8900
Permanent Magnet Density (kg/m^3):          7800
Armature Core Steel Density (kg/m^3):          7800
Rotor Core Steel Density (kg/m^3):          7800

Armature Copper Weight (kg):          0.111593
Permanent Magnet Weight (kg):          0.0199872
Armature Core Steel Weight (kg):          0.124466
Rotor Core Steel Weight (kg):          0.0502975
Total Net Weight (kg):          0.306343

Armature Core Steel Consumption (kg):          0.424629
Rotor Core Steel Consumption (kg):          0.0813077


     STEADY STATE PARAMETERS

Stator Winding Factor:        0.866025
D-Axis Reactive Inductance Lad (H):        0.000231786
Q-Axis Reactive Inductance Laq (H):        0.000231786
D-Axis Inductance L1+Lad(H):        0.000478958
Q-Axis Inductance L1+Laq(H):        0.000478958
Armature Leakage Inductance L1 (H):        0.000247173
  Slot Leakage Inductance Ls1 (H):        0.000163653
  End Leakage Inductance Le1 (H):        5.60835e-006
  Spread Harmonic Inductance Ld1 (H):        7.79113e-005
Zero-Sequence Inductance L0 (H):        0.000154732
Armature Phase Resistance R1 (ohm):        0.133723
Armature Phase Resistance at 20C (ohm):        0.109998
D-Axis Time Constant (s):        0.00173333
Q-Axis Time Constant (s):        0.00173333

Ideal Back-EMF Constant KE (Vs/rad):        0.0355554
Start Torque Constant KT (Nm/A):        0.035476
Rated Torque Constant KT (Nm/A):        0.073624


     NO-LOAD MAGNETIC DATA

Stator-Teeth Flux Density (Tesla):        2.03931
Stator-Yoke Flux Density (Tesla):        1.88583
Rotor-Yoke Flux Density (Tesla):        0.786541
Air-Gap Flux Density (Tesla):        0.594803
Magnet Flux Density (Tesla):        0.665914

Stator-Teeth By-Pass Factor:        0.032167
Stator-Yoke By-Pass Factor:        0.000767788
Rotor-Yoke By-Pass Factor:        1.23526e-005

Stator-Teeth Ampere Turns (A.T):        192.476
Stator-Yoke Ampere Turns (A.T):        63.3773
Rotor-Yoke Ampere Turns (A.T):        0.746019
Air-Gap Ampere Turns (A.T):        211.577
Magnet Ampere Turns (A.T):        -468.057

Armature Reactive Ampere Turns
  at Start Operation (A.T):        95.9778
Leakage-Flux Factor:        1
Correction Factor for Magnetic
  Circuit Length of Stator Yoke:        0.251555
Correction Factor for Magnetic
  Circuit Length of Rotor Yoke:        0.804763

No-Load Speed (rpm):        4985.57
Cogging Torque (N.m):        0.0201605


     FULL-LOAD DATA

Average Input Current (A):        1.64581
Root-Mean-Square Armature Current (A):        2.61362
Armature Thermal Load (A^2/mm^3):        43.4174
Specific Electric Loading (A/mm):        13.6808
Armature Current Density (A/mm^2):        3.1736
Frictional and Windage Loss (W):        1.1477
Iron-Core Loss (W):        0.000598958
Armature Copper Loss (W):        2.74038
Transistor Loss (W):        6.94162
Diode Loss (W):        2.01444
Total Loss (W):        12.8447
Output Power (W):        26.6548
Input Power (W):        39.4995
Efficiency (%):        67.4813

Rated Speed (rpm):        2191.06
Rated Torque (N.m):        0.116169

Locked-Rotor Torque (N.m):        0.116863
Locked-Rotor Current (A):        0.489355


     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):        60
First slot center (elec. degrees):        0



     TRANSIENT FEA INPUT DATA

For Armature Winding:
  Number of Turns:        74
  Parallel Branches:        1
  Terminal Resistance (ohm):        0.133723
  End Leakage Inductance (H):        5.60835e-006
2D Equivalent Value:
  Equivalent Model Depth (mm):        20
  Equivalent Stator Stacking Factor:        0.95
  Equivalent Rotor Stacking Factor:        1.045
  Equivalent Br (Tesla):        1.05599
  Equivalent Hc (kA/m):        763.962

土豆烧洋芋

Output Power (W):        26.6548  输出才27W不到
Input Power (W):        39.4995    输入40W不到

xenetech

土豆烧洋芋 发表于 2017-12-1 12:28
Output Power (W):        26.6548  输出才27W不到
Input Power (W):        39.4995    输入40W不到

是的，看到这个状态，希望您能提供点改进的方案意见啊

土豆烧洋芋

把输出变成40的yc_face43

lizhen2979371

Air-Gap Flux Density (Tesla):        0.594803
气隙磁密可以更高的