31 Synchronous and induction machines

31 Synchronous and - Lecture 30 Synchronous and Induction Machines So far we have seen that any machine can work either as a motor or generator If

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Lecture 30 Synchronous and Induction Machines So far we have seen that any machine can work either as a motor or generator. If a generator, mechanical power is used to rotate the rotor and electrical energy can be extracted through the stator terminals. If a motor, electrical power is supplied through the stator terminal and mechanical power is performed by the rotor’s shaft. Internally, the rotating magnetic fields will be displaced one ahead of the other depending on the mode of operation as shown in the following picture. Bs Br δ Figure 1 - Motor mode Bs Br δ Figure 2 - Generator mode In the motor mode the RMF generated by the stator is leading, whereas in the generator mode the RMF generated by the rotor is leading. Remember that both magnetic fields are rotating at the same synchronous speed ω synch . Synchronous machine The stator of a synchronous machine has 3 phase windings distributed sinusoidally with AC currents. The rotor has a single winding with a DC current (see previous lectures). To recall, a synchronous machine has only one speed, the synchronous speed. Depending on the number of poles this will be, /2 s synch P ω = And the rotor will turn at this speed as well, ms y n c h ωω = .
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This note was uploaded on 01/27/2011 for the course ECSE 361 taught by Professor Franciscodgaliana during the Spring '09 term at McGill.

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31 Synchronous and - Lecture 30 Synchronous and Induction Machines So far we have seen that any machine can work either as a motor or generator If

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