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Applications >> Sample problems >> Armature Winding InductanceThis example demonstrates how to calculate the inductance of a single stator phase coil in a permanent magnet synchronous motor.
Analysis Type:
Plane problem of DC magnetics.
Geometry model:
Parameters:
Permanent magnet coercive force Hc = 320 kA/m; remanence Br = 0.4 T;
Rated current density in the stator coil j = 2 A/mm2;
Core permeability μ is given by the B-H curve.
Solution:
We calculate the phase coil inductance for the normal operating point dividing the magnetic flux through the coil
by the current density that generates the flux. With QuickField, you would normally turn off permanent magnets' magnetization and the current in all phase coils but one. In our case, however, this would cause significant deviation in core saturation from the normal operating point. Which, in turn, would make the calculated inductance value inexact.
To avoid that, we are splitting the problem into two parts:
The 2nd part of the problem keeps all sources except the A-phase switched off. We calculate the inductance as the magnetic flux divided by the current with the help of Inductance Wizard.
Results:
Relative magnetic permeability distribution in the steel parts
Current, dI |
31.2 A |
Flux linkage, dΨ |
36.9 uW |
Inductance, dL |
1.18 uH |