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Multiphase machines are nowadays considered for high-power variable-speed drive applications due to numerous advantages that they offer when compared to their three-phase counterparts. Multiphase voltage source inverters are invariably used to provide multiphase variable voltage and variable frequency supply with appropriate pulsewidth modulation (PWM) control. Carrier-based PWM and space vector PWM...
Presence of torque pulsation in an inverter fed motor drive is evident when inverter operates in square wave mode. This paper presents qualitative and quantitative approach to access the torque pulsation in an open-loop inverter fed five-phase induction motor drive system. A method is proposed to reduce the torque pulsation in transient and steady-state conditions otherwise present in the motor due...
The frequency domain beam forming techniques specially using 2D-FFT process are used mostly in passive sonar. It provides good results mostly in applications like towed arrays that are towed behind submarines and ships. The linear hydrophone array is sampled in time .The data is transformed from time domain into frequency domain by FFT process. Then another FFT is applied along the nth frequency bin...
Multi-phase ac motor drives are nowadays considered for numerous applications, due to numerous advantages that they offer when compared to their three-phase counterparts. In principle, control methods for multi-phase machines are the same as for three-phase machines. This paper analyses operation of an indirect rotor flux oriented controlled seven-phase induction machine with current control in the...
Multi-phase AC motor drives are nowadays considered for numerous applications, due to numerous advantages that they offer when compared to their three-phase counterparts. Adjustable speed drives are invariably supplied from a voltage source inverter. Proper modelling of voltage source inverters is important in devising appropriate control algorithm. This paper develops complete model of a five-phase...
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