A shown in figure "B" of the illustrated...

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Question 1 of 205eccefa4bacbc34ba4d482a1

A shown in figure "B" of the illustrated propulsion motor variable speed drive, what principle is used to achieve variable frequency sine-wave approximated alternating current? See illustration EL-0140.

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🔍 Key Concepts

• How a variable speed drive (VSD) creates an AC output from a DC link • The role of the inverter bridge with IGBTs in switching DC on and off rapidly • How a train of high‑frequency pulses can approximate a sine wave

💭 Think About

• Look closely at the label under figure B and the block name on the inverter bridge: what kind of modulation does it say the bridge is using? • Think about which word in the choices correctly describes changing the width of individual pulses in a pulse train to control the average voltage shape. • Ask yourself: when you approximate a sine wave using many small on/off segments, what exactly are you varying—power, phase, or the time duration of each pulse?

✅ Before You Answer

• Verify which option explicitly refers to changing the width of pulses rather than power level or phase angle. • Confirm that the inverter in figure B is marked with the same key term as one of the answer choices. • Check that the method described would allow both frequency and voltage of the motor supply to be controlled by adjusting the timing of switching events.

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