Natural Cooled Rare Earth NdFeB Permanent Magnet Alternator

Natural Cooled Rare Earth NdFeB Permanent Magnet Alternator

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What is the permanent magnet generator?

The permanent magnet generator is a device that converts mechanical energy to electrical energy. In this device, the rotor windings have been replaced with permanent magnets. Permanent magnet generators are used mostly in industrial applications like turbines and engines to produce commercial electrical energy, the permanent magnet alternator is an alternate source of energy and has multiple benefits which make it a great device for a variety of residential, commercial, and industrial applications.

The structure

The permanent magnet generator is mainly composed of a rotor, end cover, and stator. The structure of the stator is very similar to that of an ordinary alternator. The biggest difference between the structure of the rotor and the alternator is that there are high-quality According to the position of the permanent magnet on the rotor, the permanent magnet generator is usually divided into a surface rotor structure and a built-in rotor structure.

Working Principle

The permanent magnet generator uses the principle of electromagnetic induction in that the wire cuts the magnetic field line to induce an electric potential and converts the mechanical energy of the prime mover into electrical energy output. It consists of two parts, the stator, and the rotor. The stator is the armature that generates the electricity and the rotor is the magnetic pole. The stator is composed of an armature iron core, uniformly discharged three-phase winding, machine base, and end cover.

The rotor is usually a hidden pole type, which is composed of excitation winding, iron core and shaft, guard ring, center ring, and so on.

The excitation winding of the rotor is fed with DC current to generate a magnetic field close to the sinusoidal distribution (called the rotor magnetic field), and its effective excitation flux intersects with the stationary armature winding. When the rotor rotates, the rotor's magnetic field rotates together with it. Every time a revolution is made, the magnetic lines of force cut each phase winding of the stator in sequence, and a three-phase AC potential is induced in the three-phase stator winding.

When the pm generator is running with a symmetrical load, the three-phase armature current synthesizes to generate a rotating magnetic field with synchronous speed. The stator and rotor fields interact to generate braking torque. The mechanical torque input from the turbine overcomes the braking torque and works.

Features

① The generator has many poles, which improve the frequency and efficiency, saving the cost of rectifiers and inverters.

② Finite Element Analysis is used when designing the generator, compact structure. Low startup torque, solves the problem of small wind startup, improving wind energy utilization.

③ Leave out the gear increaser, improve the reliability and efficiency of the generator, and lower the amount of maintenance.

④ H class insulation, vacuum pressure impregnation.

⑤ Have many structures such as vertical axis, horizontal axis, internal rotor, external rotor, and plate type.

⑥ Strong rotors, the generator could achieve high speed.

⑦ Small size, lightweight, high energy density, suitable for special situations.

⑧ Run efficiency throughout the whole speed range, high efficiency.

⑨ Use imported high-speed oil-contained bearings, maintenance free, and high reliability.

2. Variable speed generators provide a solution for Hydro Industry.

Increased efficiency from variable speed technology could make many more small hydro sites economically feasible to develop.

 

Unraveling Permanent Magnet Generators

 

Unlike conventional generators, permanent magnet generators utilize the magnetic field generated by permanent magnets to produce an electric current in the stator windings. This unique approach eliminates the need for an external power source to maintain the magnetic field within the rotor, simplifying the design of the generator and improving its operational reliability.

 

A key feature of permanent magnet generators is the direct integration of permanent magnets in the rotor, thus avoiding the inefficiencies associated with energy conversion and transfer in conventional designs. As a result, permanent magnet generators offer improved energy efficiency and power output for a given size and weight. In addition, the elimination of brushes and commutators reduces maintenance requirements and improves operational reliability, making permanent magnet generators ideally suited for applications requiring minimal downtime and maintenance intervention. The attractiveness of permanent magnet generators is further enhanced by their compactness and light weight, which makes them more suitable for mobile or space-constrained applications, resulting in greater versatility and ease of deployment compared to their traditional counterparts.

 

Permanent magnet generators are used in a variety of applications, mainly in wind and hydroelectric power generation. They offer higher efficiency and reliability, making them the preferred choice in these areas. In addition, the adaptability and scalability of permanent magnet generator technology drive the development of renewable energy systems, in line with the industry's transition to sustainable and eco-friendly solutions.

 

Ongoing research and development work on PMGs is dedicated to advanced magnetic materials, innovative designs, and optimized control systems. These efforts are designed to further enhance the performance and functionality of permanent magnet generators to maximize their potential, promote continuous improvement of the technology, and ensure its seamless integration into various applications.