Experiment_15_The_Synchronous_Motor – Part III

Experiment_15_The_Synchronous_Motor – Part...

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15 1 Experiment 15 The Synchronous Motor – Part III OBJECTIVE To determine the full-load characteristics of the synchronous motor. To determine the pull-out toque of the synchronous motor. DISCUSSION Just as it was possible to vary the power factor of the synchronous motor at no-load, it is possible to vary it under full-load condition. Although the power factor is normally held close to 100%, synchronous motor may be over-excited with direct current so as to improve the overall power factor of a large electrical system. When operated on the same electrical power system with induction motors or other devices that operate at lagging power factors, the leading reactive kilovars, supplied by the synchronous motors compensate for the lagging kilovars, of the induction motors or other devices, resulting in an improvement in the overall electrical system's power factor. Synchronous motors, like induction motors, may be temporarily overloaded. However, unlike the induction motor, the synchronous motor will maintain constant speed under overload conditions up to a certain point. This maximum overload point depends on the DC rotor excitation. Beyond this overload point the rotor poles will “unlock” from the revolving stator field and the rotor will
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Experiment_15_The_Synchronous_Motor – Part...

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