Friends, today in this article we will learn about permanent magnet synchronous generator . I am going to give you information about all this in a very good way. So let’s start.
permanent magnet synchronous generator
In recent decades, permanent magnet generators have gradually become more commonly used in wind turbine applications due to their high power density and low mass. Often these machines are referred to as permanent magnet synchronous generators (PMSG) and are considered as the machine of choice in small wind turbine generators. The structure of this generator is relatively straightforward as shown in the figure. Permanent magnets are installed on the rotor to produce a constant magnetic field and the generated power is harvested from the armature (stator) through the use of a commutator, sliprings and brushes. Sometimes the permanent magnet may be used in the form of a cylindrical cast aluminum rotor to reduce cost. The principle of operation of a permanent magnet synchronous generator is similar to that of a synchronous generator, the only difference being that a permanent magnet synchronous generator can be operated asynchronously. The advantages of PMSG include the elimination of commutators, slip rings and brushes so that machines are robust, reliable and simple. The use of permanent magnets eliminates the field winding and its associated power losses but makes field control impossible. Thus the cost of permanent magnets can be prohibitively high for large machines.
Since the actual wind speed is variable, a permanent magnet synchronous generator cannot generate electric power with fixed frequency. As a result, they must be connected to the power grid through AC-DC-AC conversion by power converters i.e. the generated AC power (with variable frequency and magnitude) is first rectified to fixed DC and then converted back to AC power (with fixed frequency and magnitude). It is also very attractive to use these permanent magnet machines for direct drive applications. They can thus eliminate the need for troublesome gearboxes that cause most wind turbine failures. These machines must have a higher pole number and be structurally larger than a machine with similarly rated gears.
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