both have their shafts connected, so when turbine spins, generator spins (it's rotor spins, stator is stationary).
rotor is magnetized using DC current and stator has three sets of windings.
changes in magnetic flux due rotation of rotor, produce EMF in coils which represents three phases.
rotor is magnetized using DC current and stator has three sets of windings.
changes in magnetic flux due rotation of rotor, produce EMF in coils which represents three phases.
-
Wind turbine?
A generator is driven by mechanical power, which is proportional to speed (rpm) and torque (turning force in newton-meters). This power is measured in watts, and the amount required depends on the power drawn by the electrical load (also in watts). Additional mechanical power is needed to make up any losses in the drive and generator itself.
Generators usually turn at a specific fixed speed, so the turbine can run at that speed if suitable, or be matched to that speed by gears. The typical large wind turbine turns at something around 10 rpm. This limit is because the tips of the blades are moving fast, and have to be limited to some speed below the speed of sound to minimise stresses and noise. The generator turns at perhaps 1500 rpm in some cases, determined by its design and the required electrical frequency, so gears are used to match the two speeds.
When the load on the generator increases, the rpm is kept the same, but the torque increases, so more mechanical power is provided. The blade angle (pitch) might be controlled by a governor to maintain constant speed. If the power is insufficient (not enough wind) the speed is still kept constant but the generator sheds some of its load until the power it needs is consistent with the power available from the turbine. That is why the generator needs to be connected to a suitable load like a grid that can accept varying inputs shared with other generators, or a battery (storage device) that can similarly accept whatever power is available within reason. There is a threshold wind speed below which the generator cannot deliver any power at all.
A generator is driven by mechanical power, which is proportional to speed (rpm) and torque (turning force in newton-meters). This power is measured in watts, and the amount required depends on the power drawn by the electrical load (also in watts). Additional mechanical power is needed to make up any losses in the drive and generator itself.
Generators usually turn at a specific fixed speed, so the turbine can run at that speed if suitable, or be matched to that speed by gears. The typical large wind turbine turns at something around 10 rpm. This limit is because the tips of the blades are moving fast, and have to be limited to some speed below the speed of sound to minimise stresses and noise. The generator turns at perhaps 1500 rpm in some cases, determined by its design and the required electrical frequency, so gears are used to match the two speeds.
When the load on the generator increases, the rpm is kept the same, but the torque increases, so more mechanical power is provided. The blade angle (pitch) might be controlled by a governor to maintain constant speed. If the power is insufficient (not enough wind) the speed is still kept constant but the generator sheds some of its load until the power it needs is consistent with the power available from the turbine. That is why the generator needs to be connected to a suitable load like a grid that can accept varying inputs shared with other generators, or a battery (storage device) that can similarly accept whatever power is available within reason. There is a threshold wind speed below which the generator cannot deliver any power at all.
12
keywords: power,How,does,rotating,turbine,generator,How does a rotating turbine power a generator