In the illustrated solid-state "soft"...

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Question 1 of 205eccefa4bacbc34ba4d483a2

In the illustrated solid-state "soft" starter for a three phase induction motor as shown in figure "A", what is the characteristic of the voltage applied to the motor during the acceleration period? See illustration EL-0060.

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🔍 Key Concepts

• Examine how the SCR/thyristor pairs in diagram C conduct on both half-cycles of the AC waveform. • Study waveforms D, E, F, and G and notice how the shaded portions of each sine wave change during starting. • Think about the difference between phase-angle control (chopping each half-cycle) and a starter that changes voltage in discrete steps.

💭 Think About

• Looking at the motor voltage waveforms, does the conduction start and stop only on positive or only on negative half-cycles, or on both? • As the motor accelerates, does the shaded area of each sine wave jump in distinct levels (like 25%, 50%, 75%), or does the firing angle of the devices appear to move continuously, changing the RMS voltage smoothly? • Would a true "step" increase show a smooth ramped edge on each cycle, or clear flat plateaus in the average voltage level?

✅ Before You Answer

• Verify from diagram A that the gate control circuits manage switching on both half-cycles of the AC supply. • Check whether the text beside the waveform in A mentions "rising rms voltage" and how that relates to a ramp versus steps. • Confirm from waveforms D–G whether the control method is best described as step changes in discrete levels or a continuous ramp as the firing angle changes.

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