This paper introduces two kinds of control schemes:
vector control and direct torque control (DTC). These control
schemes can be extensively applied to the operation of a five-phase
induction motor using a fully digital implementation. Vector control
of the five-phase induction motor not only achieves high drive
performance, but also generates the desired nearly rectangular
current waveforms and flux profile in the air-gap resulting in
an improvement in air gap flux density and an increase of 10%
in output torque. The DTC method has additional advantages
when applied to multiphase, in this case a five-phase, induction
motor. The five-phase inverter provides 32 space voltage vectors in
comparison to 8 space voltage vectors provided by the three-phase
inverter. Therefore, a more elaborate flux and torque control
algorithm for the five-phase induction motor can be employed.
Direct torque control of the five-phase induction motor reduces
the amplitude of the ripples of both the stator flux and the
torque, resulting in a more precise flux and torque control. A 32-b
floating-point TMS320C32 Digital Signal Processor (DSP) enables
these two sophisticated control techniques to be conveniently
implemented with high control precision. Experimental results
show that an ideal control capability is obtained for both control
methods when applied to the five-phase induction motor and
further validates theoretical analysis