Overview
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As demands for energy saving and high efficiency motors have increased,
reducing losses in the motor becomes more important. Iron loss, one of
the main losses of motors, is the cause of decrease in efficiency and increase
in motor's temperature since it generates heat in the magnetic material.
Therefore, while designing the motor, evaluating iron loss by a simulation
is useful.
This note presents the use of magnetic field analysis to evaluate the iron
loss of a stator core and rotor core at the rotation speed of 1800 rpm
and the current amplitude of 4.0 A with a sinusoidal current. |
Magnetic Flux Density Distribution
Figure 1 shows the magnetic flux density distributions of the stator core
and rotor core. Figure 2 shows the magnetic flux density waveform of the
r-component at the measuring points (1) and (2).
At the measuring point (1), the magnetic flux density is higher and changes
substantially. On the other hand, at the measuring point (2), the magnetic
flux density is higher but it does not change much. These differences of
magnetic flux density affect the iron loss. |
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Joule Loss Density Distribution / Hysteresis Loss Density Distribution
/ Iron Loss Density Distribution
| Figure 3, Figure 4, and Figure 5 show the Joule loss density distribution,
hysteresis loss density distribution, and iron loss density distribution
of the stator core and rotor core, respectively. Table 1 lists the losses
of the stator core and rotor core. As shown in the magnetic flux density
waveform, the Joule loss density is higher at the part where the magnetic
flux density changes substantially compared with the part where the magnetic
flux density does not change much. The hysteresis loss shows the similar
result. Both Joule loss and hysteresis loss are higher in the stator than
in the rotor according to Table 1. |
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