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8/8/2019 Vertical Axis Wind Turbine Generator
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Vertical Axis Wind Turbine Axial Field Generator
Yogesh M. Patil
Sachinam H. UpadhyayNeha S. Sangvikar
8/8/2019 Vertical Axis Wind Turbine Generator
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VAWT (Vertical Axis Wind Turbine)
Savonius type (drag type turbine)
Darrious type (drift type turbine) Our design is a cross-over between the
above two types of turbines
8/8/2019 Vertical Axis Wind Turbine Generator
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Construction of the turbine
blades The basic shape of the turbine blade is
of the shape of a teardrop.
Then assembled together with the helpof support sticks.
8/8/2019 Vertical Axis Wind Turbine Generator
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Construction of the turbine
blades After the skeleton is completed it is
then wrapped with a sheet of aluminumto get the shape as shown in thepicture below:-
8/8/2019 Vertical Axis Wind Turbine Generator
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Assembly of turbine blades Six such turbine blades are made.
Three blades are connected to the shaft 120
apart. the other three blades are also connected to
the shaft in similar manner but with oppositeorientation.
By the virtue of this, the two assembliesmove in opposite direction in the same windflow.
8/8/2019 Vertical Axis Wind Turbine Generator
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Axial Field Alternator In the axial field alternator the stator
conductors are radically disposed eithrespect to the shaft and the workingmagnetic flux is axial.
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Basic Construction
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Rotor
Eight circular arc type neodymium magnets were used to make
eight poles. The two rotors are mechanically coupled to each other.
8/8/2019 Vertical Axis Wind Turbine Generator
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Stator Stator conductors
are encapsulated in
epoxy resin forrigidity and strength.
Six coils are used inwhich gives 1 phasetwo coils.
8/8/2019 Vertical Axis Wind Turbine Generator
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Stator The stator in
sandwiched between
two rotors. As the stator is also
rotating the output is taken using sliprings.
8/8/2019 Vertical Axis Wind Turbine Generator
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Working In the design the upper turbine is
connected to the rotor and the lower
turbine is connected to the stator. With this assembly both the stator and
the rotor will rotate in the opposite
direction. Due to this, the resultant rpm of the
alternator is increased considerably.
8/8/2019 Vertical Axis Wind Turbine Generator
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Working The emf induced in the stator coils can
be clculated from the equation below.
Z = EA/P (N/60)
The output from the stator is rectifiedand is then used to charge a batterywhich can be used later.
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Advantages Since the armature is totally free from irn,
there are no iron losses.
Low weight of the stator results in low weight to power ratio of the alternator.
There are no field winding in the alternator so
there are no field winding ohmic losses. Compact shape is obtained in the form of a
disc and axial length is reduced.
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Advantages Higher efficiency leading to better
performance of the alternator ascompared to the conventionalalternators.