A shown in figure "A" of the illustrated propulsion motor variable speed drive, what statement is true? EL-0140

Correct Answer: Option B — the bridge rectifier is uncontrolled and the controller inverter bridge is transistor controlled in terms of switching

Modern variable frequency drives utilize uncontrolled diode bridge rectifiers combined with high-frequency transistorized (IGBT) inverter bridges to ensure efficient pulse-width modulation control of propulsion motor speed and torque.