Electrical_Power_Drivers-_ET3026WB-Chapt17_example_questions

Cthegoalinthestartupperiodisthenpolesofthestatortoface

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Unformatted text preview: ing statements about synchronous motors is NOT true? a) To reverse the direction of rotation we simply interchange any two lines connected to the stator. b) The dc excitation starts as soon as the motor is running close to the synchronous speed. c) The goal in the start up period is the N poles of the stator to face the N poles of the rotor (and respectively the S poles of the stator to face the S poles of the rotor) so that they repel each other. d) Once the synchronous motor rotates in synchronous speed no voltage is induced in the squirrel cage winding. mine Which one of the following statements about synchronous motors is NOT true? a) During no‐load, the axes of the pole of the stator and rotor coincide. b) When a synchronous motor is mechanically loaded the rotor pole axes are moving slightly forward than the stator poles. c) The mechanical angle α increases progressively as we increase the load. d) As the angle α increases the torque developed by the motor is greater. mine Which one of the following statements about synchronous motors is NOT true? a) The mechanical angle α can increase up to any value in normal operation. b) As the mechanical angle α increases, the stator current increases. c) When the mechanical load torque increases beyond the pull out torque the motor is stopped. d) The speed of a synchronous motor is constant and independent of the load. mine Which one of the following statements about synchronous motors i...
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This note was uploaded on 02/04/2014 for the course EE 1300 taught by Professor Bauer during the Spring '12 term at High Point.

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