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QINGDAO ENNENG MOTOR CO.,LTD. |
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High Efficiency 20kw 250rpm 400V 50Hz PM Wind Hydro Generator
Product Drawing
Technical Parameter
| No. | Parameter | Units | Data |
| 1 | Rated output power | KW | 20 |
| 2 | Rated speed | RPM | 250 |
| 3 | Rated output voltage | VAC | 400 |
| 4 | Rated current | A | 29 |
| 5 | Frequency | Hz | 50 |
| 6 | Poles | 24 | |
| 7 | Efficiency at rated speed | ＞93.6% | |
| 8 | Winding type | Y | |
| 9 | Insulation | H class | |
| 10 | Ratedtorque | Nm | 825 |
| 11 | Start torque | Nm | ＜15 |
| 12 | Temperature rise | °C | 90 |
| 13 | Bearing | SKF | |
| 14 | Weight | Kg | 340 |
Detailed Pictures
A permanent magnet generator (PMG) is an electric generator that uses permanent magnets to create a magnetic field. The magnetic field is used to induce a voltage in a coil of wire that is connected to the generator. This voltage is then used to power electrical devices or to store energy in batteries.
The structure
The design of a PMG is relatively simple. It consists of a rotor, stator, and permanent magnets. The rotor is a rotating shaft that contains permanent magnets. The stator is a stationary component that surrounds the rotor and contains the coils of wire. When the rotor spins, the magnetic field created by the permanent magnets cuts across the coils of wire in the stator, inducing a voltage.
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.
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.
Future of Permanent Magnet Generator:
Based on current trends and advancements in technology, the future of permanent magnet generators looks promising. These generators are becoming increasingly popular in various industries, including wind and hydropower generation, due to their high efficiency, low maintenance, and reliability.
One of the significant advantages of permanent magnet generators is their ability to generate power at low speeds, making them ideal for use in low-wind areas and small-scale applications. They also have a more compact design, which reduces the overall weight and size of the generator, making it easier to install and transport.
With the growing demand for renewable energy sources, permanent magnet generators are likely to play a significant role in the future of energy production. As technology advances, these generators are expected to become more efficient, cost-effective, and versatile, making them suitable for a broader range of applications.
Overall, the future of permanent magnet generators looks bright, and they are likely to continue to be a popular choice for renewable energy production.
