Application Catalog
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| 106 - Iron Loss Analysis of a Brush Motor <DP,LS> |
 Overview
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Recently, the growing demand for energy conservation and highly efficient
motors is raising the importance of reducing losses. Iron loss, which is
one of the major losses for motors, is produced when energy is released
as heat, causing the efficiency to decrease and the temperature of the
motor to rise. It is advantageous to measure the iron losses via simulation
during the design stage of a motor.
This example presents the use of a magnetic field analysis to obtain the
iron losses of the stator core and rotor core of a brush motor.
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Magnetic Flux Density Distribution
The magnetic flux density distribution is indicated in Fig. 1, the r-component
and theta component of the magnetic flux density waveform for measuring
point 1 is indicated in Fig. 2, and the r-component and theta component
of the magnetic flux density waveform for measuring point 2 is indicated
in Fig. 3.
The magnetic flux density of the rotor core is larger than the stator core
as indicated in Fig. 1. The amount of variation in the magnetic flux density
at measuring point 1 is large while the amount of variation of magnetic
flux density at measuring point 2 is small, as indicated in Fig. 2 and
Fig. 3. The difference in the amount of variations is effected by the iron
losses.
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Joule Loss Density/Hysteresis Loss Density/Iron Loss Density Distribution
The Joule loss density distribution is indicated in Fig. 4, the hysteresis
loss density distribution in Fig. 5, and the iron loss density distribution
in Fig. 6. The percentages of the losses for the stator core and rotor
core are indicated in Table 1.
The Joule losses are larger in the areas that have a larger variation of
magnetic flux compared to the areas with a smaller variation of magnetic
flux, as indicated by the magnetic flux density waveform. The same phenomena
can be seen with the hysteresis losses. The percentage of the Joule losses
and hysteresis losses are larger in the rotor core as indicated by Table
1.
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Updated: 2009-09-10
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