The difference between a synchronous generator and a generator What are the characteristics of each

There are many things to pay attention to when choosing a generator for sale. More and more comprehensive information in this area can actually be found in Beijing Borui Chenxiang Technology****. Beijing Borui Chenxiang Technology Co., Ltd. is a company specializing in the authorized sales of imported gasoline generator sets

Generators, Japan Sawafuji diesel gasoline generators, etc., the company in addition to a strong sales team for many years, there is a professional technical service team, to provide customers with comprehensive and timely pre-sales and after-sales service, the company's engineering and technical personnel are through the company's professional training, with a variety of technical service experience, and is the first to obtain qualified qualification certificates from the company professionals, services include: to our company all products to provide perfect pre-sales technical advice, program provision, After-sales service during and out of warranty period....

Both the motor and the generator are synchronous and asynchronous, and the asynchronous generator is basically constant, but relatively speaking, the power generation efficiency is also different because the frequency is different and the relative speed is different.

In wind power generation, the two main forms of generators are synchronous generators and asynchronous generators Driven by the wind, the blades rotate at variable speed with the size of the wind, and the speed of the rotor changes with the wind, and the speed determines the frequency of electricity, so the frequency of the electricity emitted is changing, and the electric frequency requirement in the power grid is 50Hz, so after synchronous power generation, the frequency needs to be controlled to 50Hz with the corresponding frequency conversion deviceThis method can fully absorb wind energy, but the supporting facilities are high**. It is often used in large-scale wind power generation.

The speed of the blades of the asynchronous generator is constant, so the frequency of the electricity emitted is constant, but the voltage is sometimes large and sometimes small, and the voltage is transformed and raised. Its mechanism is relatively simple, but the utilization rate of wind energy is small, and it is generally used in small wind turbines.

Yes, according to the reversibility of the motor principle, any motor can be used as both an electric motor and a generator.

The condition is that the input electrical power --- as an electric motor.

Input mechanical power: As a generator synchronous motor, as long as the prime mover drives the rotation and adds the excitation current, it can generate electricity.

Use the drag machine to drive the rotor to the synchronous speed, and use direct current on the rotor winding for excitation, and the stator winding can induce three-phase alternating current output.

A synchronous motor is a type of AC motor that works according to the principle of electromagnetic induction. In principle, its operation is reversible, and it can operate not only as a generator, but also as an electric motor. Another special mode of operation of synchronous motor is synchronous condenser, or synchronous compensation machine, which is specially used to send hysteresis reactive power to the grid to improve the power factor of the power grid.

Synchronous motors are mainly used as generators as AC power sources for various equipment, and nowadays the world's power generation is mainly generated by synchronous generators. Synchronous generator is one of the three major components of diesel generator set, therefore, it is important to learn and master the structure of synchronous generator and its working principle. This section mainly introduces the working principle, characteristics and basic types, basic structures, ratings and models of synchronous generators.

Electromagnetic induction and the right-hand rule can be known from the knowledge of "Electrical Engineering", when there is a relative motion between the conductor and the magnetic field, and the two cut each other, the induced electromotive force will be generated in the conductor, this phenomenon is called electromagnetic induction. If the conductor is closed, an electric current is generated in the conductor under the action of induced electromotive force, and this current is called induced current.

A wire is placed in a uniform magnetic field of two poles, and a voltmeter is attached to each end of the wire, and the needle of the voltmeter is deflected when the wire moves at a certain speed perpendicular to the direction of the magnetic field line. The above phenomenon shows that after the relative motion of the wire and the magnetic field and the mutual cutting, the induced electromotive force and the induced current have been generated in it.

1. The principle is different.

Whether the rotor speed is consistent with the stator rotation magnetic field, the rotor speed of the motor is the same as the stator rotation magnetic field, it is called a synchronous motor, and vice versa, it is called an asynchronous motor.

2. The rotor structure of the motor is different.

The rotor of an asynchronous motor is a short-circuited winding that generates an electric current by electromagnetic induction. The rotor structure of the synchronous motor is relatively complex, with DC excitation winding, so it needs to add an external excitation power supply to introduce current through the slip ring; Therefore, the structure of the synchronous motor is relatively complex, and the cost and maintenance cost are relatively high.

3. Different functions and uses.

The synchronous motor has high precision, but the construction is complex, the cost is high, and the maintenance is relatively difficult, while the asynchronous motor is slow to respond, but it is easy to install and use, and at the same time it is cheap. Therefore, synchronous motors are not as widely used as asynchronous motors. Synchronous motors are mostly used in large generators, while asynchronous motors are almost used in electric airports.

4. The speed is different.

The speed of the synchronous motor is synchronized with the electromagnetic speed, and the speed of the asynchronous motor is lower than the electromagnetic speed, regardless of the load size of the synchronous motor, as long as it does not lose step, the speed will not change, and the speed of the asynchronous motor will always change with the change of the load size.

The synchronous generator consists of two parts: the rotor and the stator.

1. The stator has stator coil, iron core, shell and other parts, the stator coil induces potential to output electric energy, the iron core provides a magnetic circuit, and the shell provides protection;

2. The rotor has a coil, an iron core and a slip ring, the transfer of the Youzi coil is used for excitation, the iron core provides a magnetic circuit and a rotating shaft, the slip ring and the brush constitute a dynamic and static combination, and there is an excitation control part outside the rotor, which is used for excitation and control of the generator to transmit the voltage containing Xinhuai.

The difference between synchronous generator and asynchronous generator Synchronous generator, that is to say, the speed of rotor rotation and the frequency of power generation, there is an absolute proportional relationship, that is, they have an equal relationship between the synchronous speed and the rotation speed of the magnetic field, that is, for example, a 2-pole excitation winding generator, if you want to generate 50Hz electricity, then the speed must be 1500 rpm, otherwise it is not 50Hz. Therefore, this kind of generator is generally used in hydropower, thermal power, diesel generator set backup power supply, and other power generation places that can provide more stable power, synchronous generator efficiency is very high, and can establish its own voltage.

In addition, the asynchronous generator, in fact, is the same as the asynchronous three-phase motor we see, its only advantage is, for example, used in wind power generation, the speed is constantly changing, but its frequency is always 50Hz, the voltage also maintains a source voltage (note here), and the current constantly changes with the speed, which is suitable for it to be used in changing power generation places. Before it can generate electricity, it must be connected to its windings by a grid or a synchronous generator, and then a rotating magnetic field is generated, and then the rotor is driven by an external force to send power in the opposite direction.

In fact, it is no different from an asynchronous motor, it is the same thing, but I will briefly summarize when it is different from an asynchronous motor, that is, when it is a generator and when it is a motor. Suppose it is used as a motor, the input coil winding frequency is 50Hz, the voltage is 380V (a total of three phases, the line voltage is 380V triangle method), and the magnetic field synchronization speed is assumed to be 1000 revolutions, then, when its rotor speed is less than 1000 revolutions, that is, less than the synchronous speed, it is a motor, and consumes active energy.

When the rotor speed is greater than 1000 rpm, that is, greater than the synchronous speed, it is a generator, which consumes reactive energy and emits active energy.

When the rotor is equal to 1000 revolutions, that is, equal to the synchronous speed, it is used as an electric motor, but the motor does not consume active power, only consumes a large amount of reactive power, and does not emit active electrical energy.

They are different in these places, that is, let its rotor be pulled by external forces, and the speed is greater than his magnetic field synchronization speed, he can generate electricity, and the voltage and frequency will be synchronized with the power grid by themselves, which is its advantage.

Haven't heard of generators having asynchronous, electric motors.

Most of them are asynchronous. The generator is dragged by other power sources (engines, water turbines, etc.), and the stator cuts the magnetic field lines once per operating cycle, which is difficult to achieve asynchronously. The rotor speed of the squirrel cage motor is lower than the speed of the magnetic field, so that the magnetic field lines can be cut, so it is asynchronous.

The rotor and stator of the synchronous motor are both windings, both of which generate a magnetic field by the power supply, and the two magnetic fields are synchronized, so the rotor is synchronized with the speed of the magnetic field.

The structure is the same, but the speed is different.

<> Definition: It refers to two or more quantities that change with time to maintain a certain relative relationship in the process of change.

Zhuyin: tóng bù

Sentence formation: The two components of the process of moral education should be carried out simultaneously.

Happiness doesn't go hand in hand with wealth, status, prestige, marriage, it's just the feeling of your heart.

When your efforts are in sync with the times, you will have a non-negligible impact on society.

The environment coexists with human beings, and development and protection go hand in hand.

Cadres are big engines, and other employees should become small engines that run in sync with big motives, so that the power will be greater. The following employees cannot be the transmission of the engine.

If there is a car: it is called international synchronization, but the configuration in China is always not good, this must be Vios.

coordinated development of national defense education and national education; Economic strength and national defense strength have grown simultaneously.

The market is synchronized with the world, and quality and life coexist.

A graceful person is a person whose form and spirit are synchronized, and there is a deep congruence between the outside and the inside.

At the same time of rapid economic growth, the construction of spiritual civilization has also been developed simultaneously, and today's Jingde mountains and rivers are beautiful, clean and beautiful, the folk customs are simple, and the environment is quiet.

If we're going to measure the cost of synchronization, these optimizations are actually hurting us, because we don't know how many synchronizations will be optimized, and in this case, probably all of them will be wiped out!

The synchronization of the generator means that after the generator is loaded with three symmetrical loads, the resultant magnetic field generated by the three symmetrical stator currents is in the same direction as the rotor. Rotating at the same speed, they remain relatively stationary in space

When the generator is loaded with three symmetrical loads, the resultant magnetic field generated by the three symmetrical stator currents is in the same direction as the rotor. Rotating at the same speed, they remain relatively stationary in space, called "synchronization".

The rotor speed of the synchronous generator is synchronized with the rotating magnetic field generated by the stator windings.