t
—A multi-motor drive, which independently controls
multiple motors by a single microcontroller and converter,
reduces the system cost by reducing the drive system parts
count. This paper proposes direct torque control (DTC) of a
two-phase induction motor (as the main motor) and hysteresis-
based current control of a permanent magnet DC motor (as
the auxiliary motor) using a four-leg converter. An augmented
switching table is proposed to control both motors. Analytical
equations are also proposed to assess the current ripple and
controllability of the DC motor. The proposed drive system and
presented theories are validated by simulation case studies in
MATLAB/Simulink.
Index Terms
—Current control, DC motors, induction motors,
torque control, variable speed drives,.