Principle of Operation

The Induction Generator is provided with two windings, one on the stator, and one on the rotor. The stator winding of the induction motor has two functions. It provides the excitation or magnetisation, and carries the armature or generated current. The rotor winding carries the armature current only. When AC excitation is present, the magnetic field created rotates at a speed determined jointly by the number of poles in the winding and the frequency of the current, the synchronous speed.

If the rotor rotates at a speed other than the synchronous speed, voltage is generated in the rotor winding at a frequency corresponding to the difference in the two frequencies, known as the slip frequency. This voltage drives the armature current, and provided the rotor speed is faster than the synchronous speed, the machine acts as a generator. The function is thus asynchronous.

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Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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