What is a Windmill Generator?

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A windmill or wind turbine generator is an electrical machine that converts the mechanical energy produced by a wind turbine into electrical energy. It plays a central role in transforming the kinetic energy of the wind into a usable source of electricity.

There are two main types of generators used in wind turbines:

1. Direct Current Generator:

   • Operates with brushes and a rotating collector.

   • Less common today due to high maintenance needs and energy losses.

2. Polyphase Alternating Current Generator:

   • Preferred in modern systems for its superior performance and reliability.

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Two Types of Alternating Current Wind Generators

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1. Asynchronous Generators:

   • The frequencies of the rotor and stator magnetic fields are different.

   • Historically used, but increasingly rare in modern wind turbines due to lower energy efficiency.

2. Synchronous Generators (or Alternators):

   • The rotor and stator magnetic fields rotate at the same speed.

   • These generators now use rare earth permanent magnets to replace the excitation coils in the rotor, offering:

     • More compact dimensions.

     • Higher efficiency.

     • Reduced maintenance needs.

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Advantages of Synchronous Generators in Wind Turbines

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• High Efficiency: Maximizes energy conversion with permanent magnets.

• Compact and Lightweight Design: Ideal for applications where space and weight are limited, such as offshore wind turbines.

• Reduced Maintenance: No brushes or rotating collectors.

• Increased Reliability: Robust design suited for demanding conditions.

 

Applications of Wind Generators

 

Wind generators are used in various contexts to produce renewable energy:

• Onshore Wind Turbines: For large-scale installations or wind farms.

• Offshore Wind Turbines: Offshore installations where winds are more constant and powerful.

• Micro Wind Turbines: Autonomous or residential systems for local energy needs.

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Conclusion

 

Wind generators, especially synchronous alternating current models using permanent magnets, are at the heart of modern wind energy production systems. Their efficiency, reliability, and optimized design make them the preferred choice for meeting the growing demand for renewable energy.

 

• Synchronous Generators by ALXION: Discover our high-performance solutions for wind turbines.