What does excitation mean in a motor, what does excitation mean

The provision of a working magnetic field for generators and other generators (electrical equipment that works using the principle of electromagnetic induction) is called excitation. Sometimes a device that provides rotor power to the rotor of a generator is also called excitation.

Excitation is a device that provides stator power to the stator of a generator or synchronous motor. According to the different excitation methods of DC motors, it can be divided into other excitation, and excitation, series excitation, compound excitation, etc., in the rotation process of DC motors, excitation is to control the voltage of the stator to produce magnetic field changes, change the speed of DC motors, and change the excitation also plays a role in changing the speed.

As early as the late 60s, Harbin Electric Machinery Factory, Shanghai Electric Machinery Factory, Dongfang First Motor Factory and other manufacturers successively designed and produced 100MW, 125MW, 200MW and 300MW units. At the same time, with reference to the technology of the former Soviet Union, equipped with AC exciter static rectifier excitation system, in the early 80s, China introduced 300MW and 600MW units of Westinghouse Company of the United States, 300MW units of Harbin Motor Factory still use static rectifier excitation system, 300MW units of Shanghai Electric Motor, 600MW units of Harbin Electric Machinery Factory all use AC exciter rotary rectifier excitation system.

According to the rectification method, it can be divided into two categories: rotary excitation and static excitation. Among them, rotary excitation includes DC AC and brushless excitation; Static excitation includes a static exciter with an electric potential source and a static exciter with a composite power supply.

Excitation is a machine that provides stator power to the stator of a generator or synchronous motor, and provides a working magnetic field for the generator or other electrical equipment (electrical equipment that works using the principle of electromagnetic induction). Sometimes a device that provides rotor power to the rotor of a generator is also called excitation.

The resultant magnetic flux is established by the resultant magnetic potential of all the windings of the motor. In a conventional DC motor, the effective magnetic potential is mostly generated by the excitation winding; In transformers, the net excitation is provided by either the primary or secondary side windings, or a portion of each, as is the case with AC motors.

Providing excitation for AC motors has a significant impact on the operating economy and reliability of motor applications. Friend H's intractable topic - excitation failure is enough to show that the normal operation of the excitation system is a necessary prerequisite to ensure the normal operation of the motor.

I'm not an expert, but I'm an electric person, and in the same way, I've had this question just like you. However, through the actual on-site construction, combined with some knowledge learned in the original books, I understand this problem in this way, and it is not necessarily completely correct.

Take the steam turbine generator set as an example, when the high-pressure steam blows the steam turbine rotor, and then drives the generator rotor to rotate, because the generator rotor and stator are only two independent sets of windings without energizing at this time, although they have relative motion, but according to the electromagnetic principle, there will be no magnetic field in their air gap at this time, so the generator stator outlet will not produce voltage, that is, it cannot generate electricity.

If you want to induce a voltage (induced potential) in the stator winding, then a magnetic field must first be generated between the stator and the rotor, and the generation of this magnetic field must be through the carbon brush installed on the rotor, and the DC voltage is added to the rotor winding, then there will be a current flowing through the rotor winding, according to the principle of electromagnetic induction, a magnetic field can be generated around the rotor winding, then this voltage is (excitation voltage). On the other hand, due to the spatial relationship, the stator winding is a relative cutting magnetic field line movement in this rotating magnetic field, and according to the electromagnetic principle, there will be an induced voltage in the stator winding, and the generator outlet will also send out electricity.

The same is true for motors, take AC motors as an example, when AC excitation voltage is added to a given stator winding (because you want to get the rotating torque on the rotor, so you need to add excitation to the stator, and you have obtained the rotor torque output that can rotate), because the current direction is alternating, a rotating magnetic field will be generated between the stator and the rotor, so the rotor will rotate in order to achieve balance, because the rotor has no current output, and all the induced magnetic fields generated are converted into rotational moments except for a part of the loss.

I don't know if it's right or not, please learn from it, and I hope that any expert will criticize and correct it.

To put it bluntly, the meaning of excitation is to add a voltage to the winding, generate current, and let the rotor form a magnetic field, and the movement of this magnetic field can generate induced electromotive force! This is how the requirements are fulfilled.

The principle of power generation of generators is electromagnetic induction! Whereas, the condition of electromagnetic induction is that the magnetic field lines of the magnetic field are cut by a closed conductor!

The core of the excitation generator is not a permanent magnet, but a non-hysteresis soft iron core with good magnetic conductivity! It requires an electric current to pass through the coil to create a magnetic field! This current is called excitation current, and this process is excitation!

According to the different structures, it can be divided into self-excitation and other excitation, and the circuit has parallel excitation, series excitation and compound excitation!

The excitation body can be either a stator or a rotor!

Not necessarily. The motor is like this, the stator and the rotor, two should be equipped with inconsistent magnetic fields, so as to produce interaction force, this magnetic field, by the external current into the motor coil to achieve, this process is called excitation.

Because the motor can wrap the coil on the stator and then on the rotor according to the need, it is not necessarily.

Generally, we call the process of forming a rotating magnetic field on the rotor of a generator according to the principle of electromagnetic induction as excitation.

There are many ways to classify excitation, such as according to the AC power supply method of generator excitation:

The first type is powered by an AC exciter coaxial with the generator, which is called the AC excitation (other excitation) system, which can be divided into four ways:

1.AC exciter (magnetic field rotation) plus static retarding silicon rectifier (brushed).

2.AC exciter (magnetic field rotation) plus stationary thyristor rectifier (brushed).

3.AC exciter (armature rotation) plus silicon rectifier (brushless).

4.AC exciter (electric distribution of celery mode pivot rotation) plus thyristor rectifier (brushless).

When the excitation transformer is connected to the end of the generator or connected to the factory power bus of the unit generator set, it is called the self-excitation mode, and the excitation transformer at the end of the machine is combined with the excitation converter of the generator stator series to supply power to the generator rotor is called the self-excitation excitation mode. There are also four ways to combine this:

1.DC side in parallel.

2.The DC side is connected in series.

3.The AC side is connected in parallel.

4.The AC side is connected in series.

It means "excitation magnetic field". Generally, it refers to the fixed magnetic field of the stator of the DC motor or the rotor of the AC synchronous motor with different excitations, and is generally composed of a coil with direct current and a yoke (iron core).

An excitation motor is a motor connected to an electrical device and a three-phase synchronous generator. Excitation is a device that provides rotor power to the rotor of the generator according to the different ways of excitation and magnetization of the DC motor, which can be divided into other excitation, excitation, string excitation, compound excitation and other methods.

There are the following differences between excitation motors and ordinary motors:

1. Compared with ordinary motors, the excitation motor is simple to control, not afraid of vibration, easy to assemble, and the excitation current can control the magnetic field strength to achieve the purpose of speed regulation, which is also the unique advantage of (DC) excitation motor;

2. The excitation motor is a high-tech control, high reliability, usually used in high-power occasions, large generators, motors are integrated into the power grid, so the power, voltage, frequency and other requirements of the generator are very high, at this time, it is necessary to choose the excitation motor;

3. The structure of the excitation motor is complex, the production process is high-end and rigorous, and it is very durable;

An excitation motor is a motor connected to a power generation device and a three-phase synchronous generator. Excitation is a device that provides rotor power to the rotor of the generator according to the different excitation methods of the DC motor, which can be divided into other excitation, and excitation, string excitation, compound excitation, etc.

In the process of rotation of the DC motor, the excitation is to control the voltage of the stator to change the magnetic field generated by it and change the speed of the DC motor.

According to the rectification method, it can be divided into two categories: rotary excitation and static excitation. Among them, rotary excitation includes DC AC and brushless excitation; Stationary excitation includes a static exciter with an electric potential source and a static exciter with a composite power supply. Ambush.

An excitation motor is a special type of motor that needs to generate a magnetic field through an externally supplied power source during operation to excite the rotor motion of the motor. Compared with ordinary motors, excitation motors have the following differences:

1.Different excitation methods: The excitation motor needs an external power supply gauge to generate a magnetic field, which can be excited by DC or AC. Ordinary motors generally use self-excited potato bonds, which generate a magnetic field through the motor's own coil.

2.Different regulation performance: Since the excitation motor can externally adjust the excitation current or voltage, the strength of the magnetic field can be flexibly adjusted according to the need, so as to achieve accurate control of the torque, speed, position and other performance of the motor.

In contrast, the magnetic field of ordinary motors is difficult to adjust, and the control performance is relatively weak.

3.Different scope of application: Excitation motors are usually used for high precision control or special applications, such as industrial automation, power systems, etc., and can provide high torque density and power density.

Ordinary motors are widely used in various electrical equipment in daily life, such as fans, washing machines, power tools, etc.

Overall, the excitation motor has advantages in terms of control performance and range of application, but increases circuit complexity and cost due to the need for an external power supply**. Therefore, when choosing a motor, it is necessary to consider it comprehensively according to specific needs and application scenarios.

Excitation refers to the provision of a working magnetic field for electrical equipment that works on the principle of electromagnetic induction. The main means of excitation is to provide electrical energy (for the core). For example, the stator coil of a DC motor is supplied with a current to generate a magnetic field to meet the conditions for the motor to rotate.

The role of the exciter.

1) Adjust the excitation current accordingly according to the change of generator load to maintain the terminal voltage as a given value;

2) Control the reactive power distribution between the generators in parallel operation;

3) Improve the static stability of generators running in parallel;

4) Improve the transient stability of the parallel operation of generator branches;

5) When there is a fault inside the generator, demagnetization is carried out to reduce the degree of fault loss;

6) Implement the maximum excitation limit and the minimum excitation limit for the generator according to the operating requirements.

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The reason why the motor should be excited: in layman's terms, the synchronous motor runs on the excitation current, and without excitation, the motor is an asynchronous motor. The excitation current is applied to the rotor.

The excitation current is added to the rotor, and the rotor is excited like a magnet with the north and south poles, and its speed and polarity are the same as the stator, so it is called a synchronous motor.