A new two-motor drive to control a two-phase induction motor and a DC motor

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.