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A dual current source inverter for an induction motor drive is presented in this paper. The dual inverter consists of two inverters connected in parallel and has single a dc power source. The inverters are operated using the same pulse width modulation (PWM) pattern, with one of the patterns being phase-shifted to the other. Each inverter supplies the torque current and the exciting current to the motor, respectively. The control strategies for constant voltage, constant exciting current, and slip frequency are demonstrated for the motor drives. The experimental results of the dual inverter are compared with those of the conventional single inverter in the steady-state and transient operation. The experiments show that, in the steady-state, the dual inverter system has the same motor characteristics as the single inverter system. The dual inverter can regulate not only the amplitude but also the phase of the output current, depending on the motor condition. The results from the transient operation demonstrate that the motor driven by the dual inverter can rapidly produce the desired torque and has good performance with fast response.
Neba et al. (Thu,) studied this question.