High Efficiency Hydro Turbine Permanent Magnet Alternator Low Maintenance

Low Maintenance High Efficiency Hydro Turbine Permanent Magnet Alternator

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What is the permanent magnet generator?

Permanent magnet generators are devices that convert mechanical movements to electricity using their own magnetic fields. It’s a type of electric motor that uses permanent magnets rather than windings on its field. These devices are commonly used in wind turbines, steam turbines, gas turbines, and engines to create electrical power. They consist of two main components: a rotor with powerful magnets and a stator with copper coils. The rotor is made from permanent magnets, and it can generate magnetic fields. Magnetic parts are set around the stators as well, so fluxes could compass them. The stator is composed of rotating coils. Once receiving the magnetic power, the stator generates electricity consequently. In this way, the movement of the rotors is transformed into electric energy. The more stator coils we have, the more electric currents we get.

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.

Advantages of permanent magnet generators:

Compared with conventional generators, reducing other rotating parts such as gear, is a safer option. Simplicity makes maintenance easier, Reduces energy consumption, and saves power up to 40%, IE4 standard

(1)Free Energy Source
Permanent magnet generators generate electricity with the inside magnets that can be used to power other electric devices, which means that you will no longer need to pay for the expensive electric bills. In addition, you can even sell your excessive electricity to local utilities and get payment from them.

(2)Low Installation Fee
Compared to generators powered by other renewable and green energy, solar energy and wind power, for example, permanent magnetic generators work independently of factors inside or outside of your house. You will no longer need to worry about the weather.

(3)Reliable Energy Output
A permanent magnet generator will not cost you a lot of money to install. You only need to buy everything necessary in a hardware store with little money and assemble one by yourself.