6万的无刷直流电机案例～请高手帮忙指正！

cxj

6万的无刷直流电机案例～看看有哪些问题？请高手帮忙指正！

cxj

帮忙看看哈，新手刚刚接触，希望得到更多的指点？

hxmotor

楼主，这个方案，我大概看了看。轭部尺寸太小了。轭部磁密都2.2T了，太高了！齿部才0.3T，太低了！
我感觉不行。
   Stator-Teeth Flux Density (Tesla):        0.302478
   Stator-Yoke Flux Density (Tesla):                2.2059

另外：6万是何意？

cxj

是6万转的意思，那请问怎么来降低轭部磁密，提高齿部磁密呢？指点一下～！谢谢

cxj

还有轭部磁密，齿部磁密应该在什么范围内才算合适？

cxj

回复 3# hxmotor

是6万转的意思，那请问怎么来降低轭部磁密，提高齿部磁密呢？指点一下～！谢谢

hxmotor

降低定子槽型高度，增加定子槽型的宽度。
    我没有搞过BLDC的实际设计，磁密情况掌握不好，但至少不应相差这多。你可以参考你那里现有成熟产品的参数。
    另外，60000rpm的电机，是否需要在转子外圆套非磁性保护套？

hxmotor

回复 8# WEZDAH


    呵呵，学习了！

cxj

回复 7# hxmotor


    嗯，加一层 非金属的保护套啊。我觉得这个效率有点低，有没有办法让太提高。还有这电机还有没有那里需要修改。求指教！！

cxj

回复 8# WEZDAH


    永磁体和护套采用过盈配合，6万应该没问题！

cxj

回复 8# WEZDAH


    永磁体和护套采用过盈配合

cxj

我现在把槽型改了一下，轭部磁密1.4T，齿部磁密2.6T，效率到了83%。还需要看那些参数啊。我觉得效率太低了，有没有办法提高。Iron-Core Loss (W):        159.641
Armature Copper Loss (W):        39.5953  这个损耗合理吗？

y1949b

建议将方案贴出来，而不要做成附件！  若需要别人帮您看，还需要花西莫币看附件，这样会对你回复量有影响的

402909230

我也没做过高速电机，但是觉得你的这个磁密对于高速电机来说还是有点高的。轭部磁密还差不多，但是您的这个齿部磁密有点高呀，这样的话损耗也是很大的，关于这个效率的问题是高速电机的效率应该都不是很高的，还有一个就是应该调节一下这两种损耗，最好让这两种损耗都差不多的情况下应该是比较合理的，就是铜耗与铁耗基本上差不多的。个人意见！

cxj

回复 14# y1949b
无刷直流电机设计

BRUSHLESS PERMANENT MAGNET DC MOTOR DESIGN

                      File: Setup1.res


     GENERAL DATA

Rated Output Power (kW):        1.3
Rated Voltage (V):        200
Number of Poles:        2
Given Rated Speed (rpm):        60000
Frictional Loss (W):        6
Windage Loss (W):        8
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):        2
One-Diode Voltage Drop (V):        2
Operating Temperature (C):        90
Maximum Current for CCC (A):        0
Minimum Current for CCC (A):        0


     STATOR DATA

Number of Stator Slots:        6
Outer Diameter of Stator (mm):          48
Inner Diameter of Stator (mm):          31

Type of Stator Slot:        4
Dimension of Stator Slot
            hs0 (mm):          0.5
            hs1 (mm):          0.5
            hs2 (mm):          1
            bs0 (mm):          1.8
            bs1 (mm):          14.4036
            bs2 (mm):          15.5583
            rs (mm):          2.6

Top Tooth Width (mm):          4
Bottom Tooth Width (mm):          4
Skew Width (Number of Slots)        0

Length of Stator Core (mm):          45
Stacking Factor of Stator Core:        0.95
Type of Steel:        DW540_50
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:        50
Type of Coils:        21
Average Coil Pitch:        1
Number of Wires per Conductor:        2
Wire Diameter (mm):          0.42
Wire Wrap Thickness (mm):          0.06
Net Slot Area (mm^2):        33.4166
Limited Slot Fill Factor (%):        75
Stator Slot Fill Factor (%):        68.9477
Coil Half-Turn Length (mm):          66.9378


     ROTOR DATA

Minimum Air Gap (mm):          3
Inner Diameter (mm):          8
Length of Rotor (mm):          45
Stacking Factor of Iron Core:        1
Type of Steel:        DW540_50
Polar Arc Radius (mm):          12.5
Mechanical Pole Embrace:        1
Electrical Pole Embrace:        0.904849
Max. Thickness of Magnet (mm):          2
Width of Magnet (mm):          36.1283
Type of Magnet:        NdFe35
Type of Rotor:        1
Magnetic Shaft:        No


     PERMANENT MAGNET DATA

Residual Flux Density (Tesla):        1.23
Coercive Force (kA/m):        890
Maximum Energy Density (kJ/m^3):        273.675
Relative Recoil Permeability:        1.09981
Demagnetized Flux Density (Tesla):        0.000150146
Recoil Residual Flux Density (Tesla):        1.23
Recoil Coercive Force (kA/m):        890

     MATERIAL CONSUMPTION

Armature Copper Density (kg/m^3):          8900
Permanent Magnet Density (kg/m^3):          7400
Armature Core Steel Density (kg/m^3):          7750
Rotor Core Steel Density (kg/m^3):          7750

Armature Copper Weight (kg):          0.0495223
Permanent Magnet Weight (kg):          0.0481229
Armature Core Steel Weight (kg):          0.229148
Rotor Core Steel Weight (kg):          0.103263
Total Net Weight (kg):          0.430056

Armature Core Steel Consumption (kg):          0.861744
Rotor Core Steel Consumption (kg):          0.103263


     STEADY STATE PARAMETERS

Stator Winding Factor:        0.5
D-Axis Reactive Inductance Lad (H):        0.000189814
Q-Axis Reactive Inductance Laq (H):        0.000189814
D-Axis Inductance L1+Lad(H):        0.000269886
Q-Axis Inductance L1+Laq(H):        0.000269886
Armature Leakage Inductance L1 (H):        8.00729e-005
Zero-Sequence Inductance L0 (H):        0.000237457
Armature Phase Resistance R1 (ohm):        0.549584
D-Axis Time Constant (s):        0.000345377
Q-Axis Time Constant (s):        0.000345377

Ideal Back-EMF Constant KE (Vs/rad):        0.0278872
Start Torque Constant KT (Nm/A):        0.0152223
Rated Torque Constant KT (Nm/A):        0.0260012


     NO-LOAD MAGNETIC DATA

Stator-Teeth Flux Density (Tesla):        1.77627
Stator-Yoke Flux Density (Tesla):        1.95799
Rotor-Yoke Flux Density (Tesla):        1.36406
Air-Gap Flux Density (Tesla):        0.35511
Magnet Flux Density (Tesla):        0.490829

Stator-Teeth By-Pass Factor:        0.0187278
Stator-Yoke By-Pass Factor:        0.0020791
Rotor-Yoke By-Pass Factor:        1.11516e-007

Stator-Teeth Ampere Turns (A.T):        15.6777
Stator-Yoke Ampere Turns (A.T):        91.7209
Rotor-Yoke Ampere Turns (A.T):        1.6448
Air-Gap Ampere Turns (A.T):        960.388
Magnet Ampere Turns (A.T):        -1069.69

Armature Reactive Ampere Turns
  at Start Operation (A.T):        2605.07
Leakage-Flux Factor:        1
Correction Factor for Magnetic
  Circuit Length of Stator Yoke:        0.105533
Correction Factor for Magnetic
  Circuit Length of Rotor Yoke:        0.378583

No-Load Speed (rpm):        67636.8
Cogging Torque (N.m):        0.0126025


     FULL-LOAD DATA

Average Input Current (A):        8.10626
Root-Mean-Square Armature Current (A):        6.18486
Armature Thermal Load (A^2/mm^3):        425.257
Specific Electric Loading (A/mm):        19.052
Armature Current Density (A/mm^2):        22.3209
Frictional and Windage Loss (W):        13.7715
Iron-Core Loss (W):        213.807
Armature Copper Loss (W):        63.0689
Transistor Loss (W):        29.1838
Diode Loss (W):        1.01722
Total Loss (W):        320.848
Output Power (W):        1300.4
Input Power (W):        1621.25
Efficiency (%):        80.2098

Rated Speed (rpm):        59540.3
Rated Torque (N.m):        0.208564

Locked-Rotor Torque (N.m):        2.70919
Locked-Rotor Current (A):        178.037


     WINDING ARRANGEMENT

The 3-phase, 2-layer winding can be arranged in 6 slots as below:

AZBXCY


Angle per slot (elec. degrees):        60
Phase-A axis (elec. degrees):        30
First slot center (elec. degrees):        0



     TRANSIENT FEA INPUT DATA

For Armature Winding:
  Number of Turns:        50
  Parallel Branches:        1
  Terminal Resistance (ohm):        0.549584
  End Leakage Inductance (H):        9.44348e-006
2D Equivalent Value:
  Equivalent Model Depth (mm):        45
  Equivalent Stator Stacking Factor:        0.95
  Equivalent Rotor Stacking Factor:        1
  Equivalent Br (Tesla):        1.23
  Equivalent Hc (kA/m):        890
Estimated Rotor Moment of Inertia (kg m^2):        1.34607e-005


这个是我改做之后的 ，你看看 还有什么问题？

cxj

这个是我改过之后的

hxmotor

楼主，想要提高效率。我感觉这个方案磁密还是过高：
Stator-Teeth Flux Density (Tesla):        1.77627
Stator-Yoke Flux Density (Tesla):        1.95799  ，造成铁耗占得比例较大：Iron-Core Loss (W):        213.807。同时感觉槽满率较低：Stator Slot Fill Factor (%):        68.9477，不知是否为自动下线？
建议降低磁密看看。减小定子槽型(自动下线就算了)或加大铁芯尺寸的方法。

cxj

回复 18# hxmotor


    采用人工下线，槽满率应该差不多了，采用集中双层绕组，槽满率一般不大于70%。否则下线困难。轴向长度长了，临界速度会下降，我试了改槽数，但是没达到效果，我理论知识欠缺，希望通过过讨论能够更深刻的理解电机的设计！

kem1234

不要选那么高的磁密