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2010-02-01
*Iron Loss Analysis of a Brush Motor
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.
·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.
·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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