Introduction
Three-phase AC motor has been used as the main driving machine for a very long period. The main reason for the use of three-phase machines has the availability of three-phase AC supply from the mains. However, with the availability of power electronic devices of high power rating, the control of drives is always from the inverter supplying power to the motor. If a motor is supplied from a dc link inverter, the number of phases can take any value without any problem. This has resulted in interest in multi-phase motor drives recently. When compared to three-phase machines, drives with higher than three-phases offer a number of advantages. The most important advantage that resulted in the development of first five-phase motor in 1969is the reduction in amplitude and an increase in the frequency of torque pulsations. The other advantages of multi-phase drives are:-
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Reduction of per phase inverter rating for the same output power of the motor. This is great advantage for very high power drives because it eliminates the need for parallel connection of switching devices.
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Reduction in the rotor harmonic losses due to absence of certain time harmonic currents.
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Possibility of higher torque density per ampere current, as space harmonic fields can also contribute to produce torque.
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Ahmad, M. (2010). Control of Multiphase AC Motor Drives. In: High Performance AC Drives. Power Systems, vol 0. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-13150-9_7
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DOI: https://doi.org/10.1007/978-3-642-13150-9_7
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