300kw 30rpm 420V IP68 Permanent Magnet Alternator Rare Earth NdFeB Material

300kw 30rpm 420V 50Hz IP68 Rare Earth NdFeB Permanent Magnet Alternator

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What is the permanent magnet generator?

A permanent magnet generator is an electrical machine that generates electrical power from the mechanical energy of a rotating shaft. The generator consists of a rotor, which contains permanent magnets, and a stator, which contains the windings. When the rotor is rotated, the magnetic field of the permanent magnets induces an electrical current in the windings of the stator, which is then transferred to the load. The generator does not require an external power source to create the magnetic field, as the permanent magnets provide a continuous source of magnetic energy. Permanent magnet generators are commonly used in renewable energy applications, such as wind turbines and hydroelectric plants, as they are highly efficient and reliable.

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.

The importance of maintaining wind turbine generators:

Wind turbines must be placed in the field, and the operating conditions are very harsh. In order to improve the reliability of wind turbines and prolong the service life of the wind turbines, routine maintenance is very important. When exchanging experience in wind power generation, foreign experienced experts once said that the focus of wind turbines is maintenance, not repair. The life span of wind turbines depends on the quality of maintenance. The maintenance of wind turbines is not complicated.

Operation and maintenance personnel must have basic knowledge of wind power technology and be able to work at heights in cold and hot weather. At the same time, the equipment maintenance personnel must have the ability to analyze and judge significant failures in person and the ability to handle on-site, and be able to quickly carry out minor repairs on the spot. Therefore, equipment maintenance personnel should be familiar with the structure of wind turbines and participate in operation and maintenance training courses during the installation process. The following maintenance measures are available for reference:

(1) According to the drawings, materials and instructions provided by the manufacturer, prepare a detailed "Wind Power Operation and Maintenance Regulations" for relevant personnel to learn and implement them carefully.

(2) Seriously study the basic principles of wind power generation, understand the performance of wind turbines, and be proficient in starting and stopping methods.

(3) Regularly carry out ideological education to cultivate the sense of responsibility and professionalism of the staff.

(4) Accidents of generator sets should be carefully recorded, the reasons should be analyzed, and experience should be continuously accumulated.

The above points need your careful attention. If you still know more about wind turbines, please pay attention to the company website, we will update it regularly!