High Efficiency Energy Saving 5-3000kw Wind Turbine Permanent
Magnet Generator
Product Drawing
Technical Parameter
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| 3phase AC Synchronous generator |
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Winding temperature level | |
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Classification of degrees | |
Generatror shell material | |
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| Cold rolled silicon steel sheet |
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Detailed Pictures
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.
The classification of permanent magnet generator:
Permanent magnet generators (PMGs) can be classified based on
various factors, such as the type of magnet, the application, the
number of phases, and the power rating. Here are some common
classifications of permanent magnet generators:
Based on magnet type: a. Ferrite Magnet PMG: These generators use
ferrite magnets, which are less expensive and have a lower magnetic
strength than rare-earth magnets. b. Rare-Earth Magnet PMG: These
generators use neodymium or samarium-cobalt magnets, which are more
expensive but have a higher magnetic strength than ferrite magnets.
Based on application: a. Wind Turbine PMG: These generators are
designed for use in wind turbines and are typically used in
small-scale or off-grid applications. b. Hydroelectric PMG: These
generators are designed for use in hydroelectric power plants and
are typically used in large-scale applications.
Based on the number of phases: a. Single-phase PMG: These
generators have a single output phase and are used in low-power
applications. b. Three-phase PMG: These generators have three
output phases and are used in high-power applications.
Based on power rating: a. Low-power PMG: These generators have a
power rating of up to a few kilowatts and are used in small-scale
applications. b. High-power PMG: These generators have a power
rating of several megawatts and are used in large-scale
applications, such as wind turbines and hydroelectric power plants.
These are some common classifications of permanent magnet
generators, but there may be other ways to classify them based on
specific parameters.
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.
⑩ The parameters like voltage, speed, and power can be customized.
The shape can be changed. Spline shaft, biaxial extension, and
flange can be used.
The differences between the electromagnet and permanent magnet
Unlike electromagnets, permanent magnets do not require any
external power source. The main difference between the use of
electromagnets and permanent magnets in wind turbines is that
electromagnets require slip rings to power the electromagnets,
while permanent magnets do not. Likewise, gearboxes require ongoing
maintenance, which adds significantly to costs.
The function of the gearbox is to convert the low speed of the
turbine shaft to the higher speed required by the induction
generator to generate electricity, but the gearbox causes friction
and reduces performance. For example, by using neodymium magnets
instead of electromagnets, we can increase the efficiency of
turbines, reduce efficiency and reduce maintenance costs.
Today, engineers have developed more sophisticated electromagnetic
generators that work in tandem with wind captured by wind turbines
to generate electricity for local consumption in homes, schools,
hospitals, commercial establishments, and more.
Application
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.
Benefits of Permanent Magnet Generators Over Induction Generators:
1. Free Energy Source
Permanent magnet generators produce electricity using their own
magnetism. So, you do not need to pay high electric bills, and a
large budget is saved. Besides, these devices do not need any other
resources, which are quite environmentally friendly.
2. Reliable Power Output
Permanent magnet generators do not need any special operating
environments. Hence, they can offer reliable performance compared
with wind turbine motors. Additionally, permanent magnet generators
do not suffer from energy loss, while induction generators
typically lose 20-30% of energy. Additionally, there are no
temperature rises in the magnetic machines, so the life of the
bearings can be prolonged.
3. Low Maintenance Fee
Due to the features mentioned above, you do not need to spend lots
of money and time on the maintenance of permanent magnet
generators. And they do not have slip rings and brushes, which are
supposed to be checked at regular intervals.
4. Compatibility
Permanent magnet generators can be employed with turbines and hydro
turbines.
Qingdao ENNENG Motor Co., Ltd is a global supplier which focuses on permanent magnet generators
and energy-saving solutions. We provide customized 5KW to 2MW
Permanent Magnet Generators suitable for Wind turbines, Hydro
turbines, and other renewable energy systems. With strong
flexibility and competitive capabilities, we can help clients to
customize the overall new energy system solution. ENNENG team has
delivered many generators to the industry in Europe, America,
Africa, and other countries and is working on many different
projects, at all speeds (from standard speed to direct drive).
We’re living our promise to the planet by offering only products
with environmental benefits and operating with a zero-carbon
footprint.
