Motor systems use nearly 70% [1] of the total
electric energy consumed by industry in the U.S.
Among industrial motor systems, three-phase
induction motors are dominant because of their
simple design, rugged performance, and easy
maintenance. AC induction motors, [2] which contain
a cage, are very popular in variable-speed drives.
They are simple, rugged, inexpensive and available at
all power ratings. Progress in the field of power
electronics and microelectronics enables the
application of induction motors for high-performance
drives, where traditionally only DC motors were
applied. AC induction [3], [4] drives offer the same
control capabilities as high performance fourquadrant