September 2010
Intermediate to advanced
200 pages
3h 36m
English
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4.8 THE SWING EQUATION
The relative position of the rotor axis and the stator magnetic field axis is fixed under normal operation. The angle between the two is known as the load angle or torque angle denoted by δ and depends upon the loading of the machine. Larger the loading, larger is the value of torque angle δ. The equation describing the relative motion of the rotor (load angle δ) with respect to the stator field as a function of time is known as the swing equation. The net torque causing acceleration is,
Ta = TS − Te where Te = electromagnetic torque
Ts = shaft torque
Ta is positive if Ts > Te for the generator
If Te > Ts the motor will accelerate. Multiplying both sides of the above equation with angular velocity ...
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