Discussion
A synchronous motor drive is described as operating at constant torque below base speed. Above base speed it operates at
Answer: D
Correct answer: constant power with weakening field
Below base speed the voltage is raised with the frequency to hold the flux constant, so the machine can develop rated torque throughout. At base speed the converter voltage reaches its ceiling and cannot rise further, so beyond it the excitation is reduced - field weakening - and the flux falls as \( 1/f \). Torque falls in proportion while the product of torque and speed stays roughly constant, giving the constant power region.
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