Overview
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A linear induction motor can be constructed at low cost, because the motor
can use a primary side made of coil, and secondary side made of a conductor
that is not magnetized, such as aluminum or copper. It is important to
analyze the thrust force as well as the end effect that causes lower performance
at low slip when evaluating the performance of linear induction motors.This
example analyzes the thrust force of a linear induction motor. |
Current Density Distribution
Closeup |
The eddy current density distribution and magnetic flux line are indicated
in Fig. 1. The thrust force is produced through the interaction between
the magnetic field and eddy currents that occur in the aluminum sheet from
the variations in the magnetic field created by the coil.There are more
eddy currents remaining in the rear of the motor at translation speed of
3.7125 m/s, than a translation speed of 1.2375 m/s, as indicated in Fig.
1. The variations of magnetic flux at the rear of the motor increase when
the translation speed increases. |
Thrust Force
| The thrust force is indicated in Fig. 2. The thrust force reaches a maximum
of 360 N when the translation speed is 1.2375 m/s for this linear induction
motor to start from a stationary state and reach a synchronous speed, and
the thrust force reduces thereafter. This is because the amount of variations
in the magnetic flux is reduced as the magnemotive force created in the
coil reaches a synchronous speed, and the amount of eddy currents in the
aluminum sheet is also decreases. |
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