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The six-step operation of surface-mounted permanent magnet machine drives in a flux weakening region has many advantages compared to the pulse width modulation mode, such as the reduced switching loss and fully utilized inverter output voltage. However, if the ratio of the sampling frequency to the fundamental frequency is low in fixed sampling system, the low-frequency oscillation in the current...
This paper proposes the asymmetric six-step operation which can adjust the level of the phase voltage in three phase voltage source inverter. In high power systems, the switching frequency of the power switch is limited to a few hundred hertz. So, the conventional symmetric six-step operation is commonly used because of the maximized modulation index and the minimized number of switching. However,...
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