Q. 18 The speed of a 3-phase, 440 V, 50 Hz induction motor is to be controlled over awide range from zero speed to 1.5 time the rated speed using a 3-phase voltage source inverter. It is desired to keep the flux in the machine constant in the constant torque region by controlling the terminal voltage as the frequency changes. The inverter output voltage vs frequency characteristic should be
Answer:(D)
Explanation:
