This paper proposes improved speed control for a five-leg inverter that drives the two induction motor used in various fields. The
improved control method includes two
controllers: 1) The first controller controls slip frequency for maintaining
the mechanical speed
of two motors equally under the any load
condition. 2) The second controller controls the electrical phase angle
the two motors for minimizing the common leg
current because it can be twice higher than other leg`s current depending on
operation condition of the two-motor.
Additionally, stability criterion of the proposed two controllers is
implemented. Analysis results
of maximum operation speed range and
inverter efficiency shows the effectiveness of the improved speed control
experimental results demonstrate the
performance of the improved speed control for FLVSI.
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