vorHAz-Lecture10

vorHAz-Lecture10 - Magnetomotive Force and Flux...

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Page 1 Fundamentals of Power Systems Lecture 10 1 Magnetomotive Force and Flux Distribution z The magnetic field used to induce sinusoidal voltages (in the stator) has to be distributed sinusoidal along the circumference of the stator/rotor (air gap) ± , |H S |, or |B S | D Snapshot of one instantaneous value in time This spatial distribution of B S rotates with Z M Z M t Fundamentals of Power Systems Lecture 10 2 D 360 Practical Winding Considerations z Distributed stator winding with varying number of turns per slot z Generates space harmonics of B S (can be reduced by more slots and/or fractional-pitch windings) Only one phase winding shown! Number of turns per phase and slot vary, total number of turns per slot stay constant B S Excitation
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Page 2 Fundamentals of Power Systems Lecture 10 3 Induced Voltage in Stator Loop – 2 Poles Z M t z Rotor field B R rotates CCW with Z M t=> equivalent to conductors moving through with velocity Rotor system Stator system z With sinusoidal field
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vorHAz-Lecture10 - Magnetomotive Force and Flux...

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