What is a Permanent Magnet Alternator?

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A permanent magnet alternator is an electrical generator designed to convert mechanical energy into alternating electrical energy. This synchronous machine operates with three-phase alternating current to produce a balanced system of voltages and currents.

The operating principle is based on the synchronization of the magnetic fields of the stator (the stationary part) and the rotor (the moving part), which rotate at the same speed. The excitation of the rotor is provided by permanent magnets fixed to it.

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Structures of Permanent Magnet Alternators

 

There are two main configurations for a permanent magnet alternator:

1. Internal Rotor and External Stator:

   • The rotor is located inside and carries the permanent magnets.

   • The stator, in contact with the surrounding air, promotes efficient cooling of the windings.

   • Advantage: Excellent thermal dissipation, increasing reliability and performance.

2. External Rotor and Internal Stator:

   • The permanent magnets are placed on an external rotor surrounding the stator.

   • Less common in applications requiring optimal cooling.

Alternators with an external stator are generally preferred for their superior performance in terms of:

• Power-to-weight/volume: More energy for a given weight or volume.

• Torque-to-weight/volume: Better mechanical efficiency.

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Applications of Permanent Magnet Alternators

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Permanent magnet alternators are widely used in sectors requiring efficient energy conversion, including:

• Renewable energy:

  • Wind turbines.

  • Hydrokinetic turbines.

• Industrial automation.

• Isolated energy production systems.

• Machine tools requiring autonomous electrical power.

For example, ALXION STK alternators are particularly suited for applications where energy performance and reliability are critical.

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ALXION STK Alternators: Cutting-Edge Solutions

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The ALXION STK alternators combine an external stator and internal rotor configuration to offer:

• Excitation by high-energy rare-earth permanent magnets: Maximizing performance.

• Excellent thermal dissipation due to the stator's direct contact with the surrounding air.

• Optimized energy efficiency for demanding applications.

 

Advantages of Permanent Magnet Alternators

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• High efficiency: Due to the use of high-energy permanent magnets.

• Increased reliability: Fewer moving components, reducing the risk of failure.

• Optimal cooling: External stator structures facilitate thermal dissipation.

• Compact and lightweight: Ideal for installations where space and weight are limited.

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Conclusion

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Permanent magnet alternators offer a high-performance and reliable solution for converting mechanical energy into electrical energy. With their efficiency and versatility, they have become a preferred choice for industrial and renewable applications. Explore the ALXION STK range, designed to meet the highest standards in performance and durability.

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• ALXION STK Alternators: Learn more about our solutions.