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Home / Examples / Magnetic Analysis (Luvens, Transient Analysis) / Example 5: Power Generation of IMP Generator
Example 5: Power Generation of IMP Generator
General
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Power generation of IPM generator is analyzed.
The power is generated in the coils of the stator by the rotor's rotation.
The model is a permanent magnet synchronous generator with magnets built in the rotor. -
The current generated by the rotor's rotation is calculated.
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The analysis coupled with the external circuit is performed.
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The current and the magnetic flux density are solved.
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Unless specified in the list below, the default conditions will be applied.
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Obtain this session's project file. (Right-click and choose 'Save link as')
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Results will vary depending on Femtet version and the PC environment.
Analysis Conditions
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Item |
Settings |
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Analysis Space |
2D |
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Thickness in Depth Direction |
30 [mm] |
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Unit |
mm |
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Solver |
Magnetic Analysis [Luvens] |
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Analysis Type |
Transient Analysis |
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Options |
Select External Circuit Coupling. Select Rotating Machinery.
[Partial Model (Symmetric Model) Setting] Select Partial Model. Division Number: 2 [Conversion of External Circuit I/O Values] Select Convert Number of Series: 1 Number of Parallels: 2 Select Convert results to full model for output |
The Rotating Machinery tab is set as follows.
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Tab |
Setting Item |
Settings |
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Rotating Machinery |
Rotational Move |
Select Constant Velocity Number of Rotations: 3000 [r/min] Rotor’s Initial Rotation Position: 0 [deg] |
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Number of Sliding Mesh Divisions |
Circumferential Division Angle: 1.0 [deg] Rotational Quantity per Step: 3 [meshes] Number of Sliding Mesh Layers: 3 |
External circuit is as follows.
[R1] is a resistor to detect the generated power. It is placed where a battery is supposed to be placed.
Its value is set to be small enough, 0.001 [Ohm], for the battery's internal resistance.
Set the Mesh Tab as follows.
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Tab |
Setting Item |
Settings |
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Mesh |
Meshing Setup |
Automatically set the general mesh size: Deselect General Mesh Size: 1 [mm] |
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Air Domain Creation |
Select Create air domain automatically Air Domain Scale: 1.25 |
The Transient Analysis tab is set up as follows.
The umber of calculation steps is 180, circumferential division angle is 1.0[deg], and rotational quantity per step is 3 [mesh]. The rotation up to 540 degrees (=180*1.0*3) is analyzed.
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Tab |
Setting Item |
Settings |
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Transient Analysis |
Timestep |
Automatic |
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Table |
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Model
A rotor core and magnet are placed in the center. A stator and coils are placed around them.
This is a 2D analysis of a symmetric half model.
Periodic rotation boundary (symmetric) is set.
[Air Domain Creation] is selected.
Body Attributes and Materials
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Body Number/Type |
Body Attribute Name |
Material Name |
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6/Sheet |
Mag1 |
mag |
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7/Sheet |
Mag2 |
mag |
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5/Sheet |
Rotor |
core |
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20/Sheet |
Stator |
core |
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22/Sheet |
U1+ |
Cu |
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21/Sheet |
W1- |
Cu |
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25/Sheet |
V1+ |
Cu |
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23/Sheet |
U1- |
Cu |
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26/Sheet |
W1+ |
Cu |
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24/Sheet |
V1- |
Cu |
The body attribute is set up as follows.
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Body Attribute Name |
Tab |
Settings |
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Mag1 |
Direction |
Vector: X=1, Y=0, Z=1 |
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Stator/Rotor/Air |
Rotor |
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Mag2 |
Direction |
Vector: X=1, Y=0, Z=-1 |
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Stator/Rotor/Air |
Rotor |
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Rotor |
Stator/Rotor/Air |
Rotor |
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Stator |
Stator/Rotor/Air |
Stator |
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U1- |
Current |
Waveform: External Circuit Coupling Coil Name on the Circuit: U1 Turns: 15 [Turns] Direction: -Y Direction |
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Stator/Rotor/Air |
Stator |
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U1+ |
Current |
Waveform: External Circuit Coupling Coil name on the circuit: U1 Turns: 15[Turns] Direction: +Y Direction |
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Stator/Rotor/Air |
Stator |
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V1- |
Current |
Waveform: External Circuit Coupling Coil Name on the Circuit: V1 Turns: 15 [Turns] Direction: -Y Direction |
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Stator/Rotor/Air |
Stator |
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V1+ |
Current |
Waveform: External Circuit Coupling Coil Name on the Circuit: V1 Turns: 15 [Turns] Direction: +Y Direction |
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Stator/Rotor/Air |
Stator |
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W1- |
Current |
Waveform: External Circuit Coupling Coil Name on the Circuit: W1 Turns: 15 [Turns] Direction: -Y Direction |
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Stator/Rotor/Air |
Stator |
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W1+ |
Current |
Waveform: External Circuit Coupling Coil Name on the Circuit: W1 Turns: 15 [Turns] Direction: +Y Direction |
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Stator/Rotor/Air |
Stator |
The material properties are set as follows.
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Material Name |
Tab |
Properties |
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Cu |
Conductivity |
Conductivity Type: Conductor Conductivity: 5.977x107 [S/m] |
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mag |
Permeability |
Material Type: Permanent Magnet |
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Magnet |
Magnetization Characteristic Type: Linear Magnetization Strength: 1.25 Relative Permeability: 1.05 |
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core |
Permeability |
Magnetization Characteristic Type: Select B-H curve
B-H Curve Table
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Boundary Conditions
Symmetric period boundary is set.
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Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
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Symmetric |
Symmetry/Continuity |
Periodic |
Rotation (Periodic) |
Results
The distribution of the magnetic flux density at the rotation angle of 0 [deg] is shown below.
In the result table, the generated current is output as the circuit current of the resistor, which is for detecting the generated power.
The diagram below is time-generated current characteristic.
The generated power is about 155 [A] on average of the current in the steady state.