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Structure of Brushless AC Synchronous Generator

Jan. 03, 2019

Structure of Static part of a brushless AC synchronous generator

 

The structure of the brushless AC synchronous generator is divided into two parts, a stationary part and a rotating part. The stationary part is called a stator, and includes a base, a stator core, a stator winding, an end cover, a bearing cover, and a stator of an AC exciter.



Structure of Brushless AC synchronous Generator.jpg



 

Stator

It consists of a base, a stator core and a stator winding. The stator core and the stator winding are part of the induced potential and current, which is also called the armature.

 

1. Base: The overall support of the generator, used to fix the armature and the front and rear end caps together to support the rotor. There are generally outlet boxes on the base, located on the upper part of the base, and only on the right side (from the extended end of the shaft). A wiring board is installed in the outlet box to draw an alternating current or the like.

 

2. Stator core: part of the stator iron core generator magnetic circuit. In order to reduce the eddy current loss, the core is formed by laminating silicon steel sheets coated with insulating varnish on both sides. The core is provided with a uniform stepped slot to embed the discharge pivot winding.

 

3. Stator winding: consists of coil windings, which are connected in a certain way and embedded in the core slot. The three-phase windings should be placed symmetrically and shy at 1200 electrical angles to each other.

 

End cap

 

Since the end cap and the base are used to support the rotor, a bearing bore should be opened at the center of the end cap for mounting the bearing. The end face of the end cover has a stop and the base, and the diesel engine is equipped with a generator on both ends of the shaft extending end cover, and has end stops to ensure the coaxiality of the rotor after assembly.

 

AC exciter stator

 

The alternating current generated by the AC exciter is rectified by a rotary rectifier for excitation by a synchronous generator. In order to avoid excitation currents for the exciter and the rotating pole generator brush and the slip ring, the stator of the AC exciter is a magnetic pole, and the rotor is an armature.

 

Structure of rotating part of brushless of AC synchronous generator

 

The rotating part of the generator is called the rotor. It includes rotor core, pole winding, rotating shaft, fan, AC excitation electomechanical pivot and rotary rectifier.

 

1. Rotor core

There are usually separated salient, integral salient, and hidden pole rotors.

 

2. Rotating shaft

At the shaft end of the generator, the shaft is coupled to the diesel engine through a coupling on the shaft. It is a key part of converting mechanical energy into electrical energy, and therefore must have high mechanical strength and rigidity.

 

3. Bearing

 

The generator adopts two supporting type, that is, bearings are installed at both ends of the rotating shaft. According to the force, the drive end uses roller bearings, and the non-drive end uses ball bearings.

 

4. Fan

When the generator is running, it will generate various losses and cause heat to be radiated, so the generator shaft is equipped with a fan for ventilation cooling. In order to improve the ventilation efficiency, a backward tilting centrifugal fan is installed in the driving end cover. In this way, during the operation of the generator, the cold air enters the interior of the generator from the non-drive end cover and the two sides of the base, adsorbing the heat of the armature winding, the pole winding, the stator and the rotor core, and then passing through the drive end cover. The window hole discharges hot air out of the machine to ensure that the temperature rise of the generator is within the allowable range.

 

5. Armature of AC exciter

In the brushless synchronous generator, the alternating current generated by the armature of the AC exciter is rectified by the rotary rectifier to become direct current for excitation by the alternator.

 

6. Rotary rectifier

The rotary rectifier is a device that rotates coaxially with the AC exciter.


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