What is the principle of induction generator? What is the difference between its structure and synchronous generator?

1. Principle of induction generator: An alternator, which makes use of the magnetic permeability difference between the teeth and slots (the air gap on the teeth is high and the slot height is low) of the inductor, so that the magnetic linkage of the stator armature winding periodically pulsates when the inductor rotates, thus generating induced electromotive force in the winding.

Second, the difference between structure and synchronous generator:

1, different excitation

Synchronous generators usually adopt DC excitation, and induction generators usually adopt ring excitation windings and DC excitation.

2. The structure operates in different ways.

The armature winding of the induction generator is embedded in the stator core, and there is no winding on the rotating induction generator, only a rotor with evenly grooved surface. Therefore, the induction generator has a simple structure and can have a high rotating speed; Because synchronous generators usually adopt DC excitation, when they operate independently, the voltage of generators can be easily adjusted by adjusting the excitation current.

Extended data:

Maintenance of synchronous generator:

Synchronous generator is the key component of diesel generator set. It is very necessary to establish a suitable working environment and do daily maintenance for diesel generator sets.

High temperature, high humidity and air pollutants in the generator room are the most common factors leading to generator failure. The accumulation of dust, dust and other air pollutants will worsen the performance of the insulation layer, which will not only easily form a conductive path to the ground, but also increase the friction of the rotor bearing part and generate heat. Moisture and moisture in air pollutants can easily form a leakage path to the ground in the generator, resulting in generator failure. Excessive temperature in the machine room will make it difficult to dissipate the heat generated by the generator set when it works, which will lead to the decrease of its output power and overheating of the generator set. Therefore, we must pay enough attention to the dustproof, moistureproof, ventilation and heat dissipation of the computer room.

Whether it is a single-bearing generator or a double-bearing generator, the concentricity of the connection between the rotor shaft and the main shaft of diesel engine is very high. After long-term operation, the coaxiality of the unit sometimes decreases, which leads to the increase of generator noise and high temperature. Regular inspection and maintenance should be carried out to maintain good coaxiality.

The load exceeds the rated load range of the generator, or the three-phase load is unbalanced, which will also cause the generator efficiency to decrease and overheat.

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