Permanent Magnet Generators for Hydroelectric Applications

Generators are widely used in industrial and agricultural production, national defense, science and technology, and daily life. There are many forms of generators, but their working principles are all based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its construction is: to use appropriate magnetic and conductive materials to form magnetic circuits and circuits that conduct electromagnetic induction with each other, so as to generate electromagnetic power and achieve the purpose of energy conversion.

The working principle of the synchronous generator: The rotor of the synchronous generator is rotating, and the two ends of the rotor excitation winding coil installed in it are connected with two slip rings that are insulated from each other. For the field winding, when the rotor field winding is energized, a magnetic field will be generated, with N poles and S poles. When the rotor rotates under the drive of the prime mover, the three-phase stator armature winding is in the rotating magnetic field and cuts the magnetic field lines to induce an electric potential. The output end is connected to the load, and the generator will supply power to the load.

Permanent magnet generator: simple structure, large rotor magnetic field, no excitation winding, no carbon brush, no slip ring, large air gap, no contact, the only worn part of the whole machine is the bearing. The reliability of the product is improved, no external regulator is needed, and the distance between the magnetizer materials is optimized to reduce magnetic flux leakage so that the generator has good idle speed performance and sufficient output circuit.

The use of permanent magnet wind turbines can not only improve the efficiency of the generator, but also reduce the volume while increasing the capacity of the motor, and because the generator adopts a permanent magnet structure, it saves the consumption of brushes and collector rings. Mechanical components improve the reliability of the system, which is also one of the development trends of wind power generators.

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Our permanent magnet generators have been used in a wide variety of hydroelectric applications. From penstocks to tidal projects, the company’s generators have stood the test of time by providing reliability and affordability in an industry where it is vital.

Hydropower supplied 6.4% of the world’s primary energy in 2007, equating to almost a fifth of global electricity production. However, most large sites that can be exploited economically have already been developed. Smaller sites are now sought and much of the global undeveloped potential exists with sites under 100 KW in size. One major disadvantage of smaller systems is, being mostly run-of-river, they often experience large seasonal variations in flow. This can be a serious challenge in parts of Africa for example where the river discharge during the wet season is significantly greater than that during the dry season, and this will be exacerbated by climate change. This can be managed by having a variable-speed permanent magnet generator that is able to utilize varying water flows for generating electricity.

Tidal and Hydrokinetic Power

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Tidal power seems to take a front seat in the growing search for power sources that will fuel the growing global power demand. Permanent magnet alternators are required for tidal power due to the high fluctuations in water levels and the velocities of water. Enneng looks to play a leading role in serving this market going forward by matching its products with those in need of the industry.

Hydro Permanent Magnet Generators: Price vs RPM

Hydro permanent magnet generators are operated at different speeds. But price becomes a compensation factor when varying the speed of the alternator. The price of an alternator is inversely proportional to the speed. Decreasing speed will result in increasing the size of the alternator.

Hydro Permanent Magnet Generators: Voltage vs RPM

The voltage generated is directly proportional to the speed of the prime mover. Increasing RPM and Increasing the load will have an effect on voltage in a hydro permanent magnet generator. Hence a relation between these factors is essential for manufacturers.

Gearboxes give way to Direct Driven Turbines & Hydro Permanent Magnet Generators

Direct-driven turbines are proving to be more reliable and efficient. This reduces the cost of productivity. They have been around for quite some time now but their huge size and cost were a problem. But modern technology has developed newer, lighter, and affordable models which are used in hydro permanent magnet generators.

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