Application Catalog
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| 1 - Analysis of a Three Phase Induction Motor <DP> |
Overview
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Induction motors are widely used in many industries for their affordability,
robustness, and high efficiency.
This note shows a case study in which N-T (number of rotation speed versus
torque) characteristic and current distribution are obtained using JMAG. |
Current Distribution
Closeup |
In an induction motor, torque is produced by the interaction of the rotating
magnetic flux generated by the current in the stator coil, and current
induced in the cage. Thus, the induced current defines the torque characteristics.
Fig.1 shows the current distribution in the cage calculated from the analysis. |
N-T Characteristic
Fig.2 shows that the maximum torque for this induction motor is obtained
at around 1000rpm.
As shown in Fig.2 the torque is high in rotation at high speeds indicating
that the motor's cages have low electric resistance.
In the range labeled b in Fig.2, the rotation speed is relatively constant
regardless of the torque changing significantly, and therefore the motor
rotates steadily in the speed range. |
Closeup |
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Updated: 2011-02-28
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