Refer to the simplified diagram of the AC...

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Question 1 of 2066636eed28f7522a1c51d979

Refer to the simplified diagram of the AC synchronous electric motor drive system as shown in the illustration. The propulsion motor operates from maneuvering speed to full ahead speed in the ahead direction. The propulsion motor will not operate at any speed in the astern direction. What is most likely the problem? Illustration EL-0155

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Question 1 of 20

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🔍 Key Concepts

• Review how an AC synchronous motor changes direction of rotation in a variable‑speed drive system. • Compare the roles of the controlled rectifier (DC link) versus the controlled inverter in this illustration. • Think about whether direction of rotation is controlled on the AC side feeding the stator or by changing the field polarity on the rotor.

💭 Think About

• If the motor runs perfectly from maneuvering to full ahead, what parts of the system are clearly working correctly? • In this diagram, which component actually creates a rotating magnetic field with a chosen phase sequence for T1, T2, and T3 going to the motor? • Would an ‘open astern winding’ or ‘field polarity reversal failure’ prevent operation in only one direction, or would they affect both directions? Why?

✅ Before You Answer

• Be sure which device in the diagram is responsible for setting the phase sequence of the three‑phase supply to the motor (ahead vs astern). • Confirm that the rectifier/DC link only provides controlled DC, not a three‑phase reversing output to the motor terminals. • Check whether a synchronous motor’s direction is normally changed by reversing the stator phase sequence or by reversing rotor field polarity in this type of drive.

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