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Address: No. 18, Xinye Road, High-Tech Zone, Qingdao,Shandong, China
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QINGDAO ENNENG MOTOR CO.,LTD. |
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Small Hydro Turbine Low Water Head Permanent Magnet Alternator Manufacturer
Product Drawing
Technical Parameter
Detailed Pictures
Permanent magnet generators are synchronous machines with rotor windings replaced by permanent magnets. They need no separate excitation so rotor excitation losses – about 30% of total conventional generator losses – are eliminated. This results in high power density and small size with the highest efficiency at all speeds, offering the maximum annual production of energy with the lowest lifetime cost.
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.
Benefits
Applications of Permanent Magnet Generator
1. Wind turbines: Permanent magnet generators are widely used in wind turbines to convert the kinetic energy of wind into electrical energy. They are highly efficient and reliable, making them a popular choice for wind energy generation.
2. Hydroelectric power plants: Permanent magnet generators are also used in hydroelectric power plants to convert the mechanical energy of falling water into electrical energy. They are particularly useful in low-head hydroelectric systems where the water flow is slow and the head is low.
3. Electric vehicles: Permanent magnet generators are used in electric vehicles to generate electricity for charging the battery. They are also used in hybrid vehicles to provide additional power to the engine.
4. Marine applications: Permanent magnet generators are used in marine applications, such as wave and tidal energy generation, as they are highly reliable and can withstand harsh marine environments.
5. Aerospace applications: Permanent magnet generators are used in aerospace applications, such as satellite power systems and space probes, as they are lightweight and highly efficient.
6. Industrial applications: Permanent magnet generators are used in various industrial applications, such as backup power systems, emergency power systems, and microgrid systems. They are also used in remote areas where there is no access to the grid.
