32 Analysis of synchronous and induction machines

32 Analysis of synchronous and induction machines - Lecture...

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Lecture 31 Analysis of Synchronous and Induction Machines Synchronous machine Recalling from previous lectures, this type of machines have three phase windings at the stator with balanced AC currents, and a single winding in the rotor with DC current. Therefore it has two independent magnetic fields. In order to have torque both magnetic fields must turn at the same speed ω sync given by, /2 s sync P ω = The torque speed characteristic is as follows. Therefore they generate torque at constant speed. The rotor can rotate either clockwise or counter-clockwise and that is the reason there are two straight lines in the graph. These change of direction would correspond to a change of phase sequence in the AC currents of the stator. We have seen that the equivalent circuit for this machine is
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Ef Vt + - - + Xs I Figure 1 - Synchronous generator Ef Vt + - - + Xs I Figure 2 - Synchronous motor Depending on how the current is flowing and defined we can get the equation for this machine. Normally a generator provides the current whereas the motor consumes the
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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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32 Analysis of synchronous and induction machines - Lecture...

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