A number of these field-electric circuit models includedsome form of control structures. However, most of the controlstructures incorporated in the models are invariably limited tovery simple opened-loop control schemes, such as controllingthe inverter switches using rotor angular position and speed [3],or pulse-width modulation (PWM) control signals generated bycomparing three-phase idealized reference voltages with a common isosceles triangle carrier waveform [6]
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