As shown in figure "A" of the illustration,...

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Question 1 of 2066636eed28f7522a1c51dac5

As shown in figure "A" of the illustration, what is the primary reason that the propulsion transformers are configured differently so as to produce a 30-degree phase shift in the pulses between the two synchro converters supplying separate stator windings? Illustration EL-0160

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Question 1 of 20

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🔍 Key Concepts

• Six-pulse vs twelve-pulse converter operation and how phase shifting between transformer secondaries affects rectifier/inverter performance • How harmonic currents and voltage waveform distortion are created in power electronic propulsion systems • Why separate stator windings can be fed from converters that are phase-shifted by 30 degrees

💭 Think About

• Think about what happens to the overall current and voltage waveform when you combine the outputs of two identical converters that are shifted by 30 degrees—what happens to the harmonics? • In a large AC propulsion motor, which problem is usually more serious and expensive to correct electrically: small changes in shaft torque/power, or distortion of the supply waveform and resulting harmonics? • If the goal were mainly to increase power output or power factor, would you normally accomplish that by phase-shifting two converter supplies to separate stator windings, or by changing something else in the system design?

✅ Before You Answer

• Identify which choice directly relates to waveform quality and harmonics in a rectifier/inverter-fed propulsion system • Check how a 30-degree phase shift between transformer secondary windings is commonly used in power electronics (hint: six-pulse vs twelve-pulse systems) • Ask whether any option would typically be handled by mechanical design of the motor (torque/vibration) rather than by electrical phase shifting of converter outputs

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