What's brushless AC generator?
The AC exciter in the brushless AC synchronous generator has a w armature structure. Let's take the TFW series brushless AC synchronous transmission as an example to introduce the structure of the generator.
This type of generator base is welded with steel plates. The front and rear covers are made of cast iron, and the axial ventilation is self-cooled. The balance is supported by two bearings. The flange connected with the prime mover makes the unit easy to install.
Ⅰ. Stator
The stator is composed of a stator core, a stator, and a machine base. The core and stator windings are the parts that generate induced electromotive force and current. This part is called the armature. The stator core is an integral part of the magnetic circuit of the synchronous generator. In order to reduce the eddy current loss, the core is generally formed by laminating two silicon steel sheets with insulating paint. There are evenly distributed slots in the iron core to embed the armature winding. The stator winding of a diesel generator is composed of a coil wound with high-strength polyimide enameled copper wire, and the coil is embedded in the core slot according to certain technical requirements. When installing three-phase windings, they should be embedded symmetrically, forming a 120 "electrical phase angle with each other. Shamu is a bracket for the generator, which is used to fix the armature and support the rotor with the front and rear end covers. There is an outlet box, inside the box, and a wiring board to facilitate the extraction of AC power.
Ⅱ. Rotor
The rotor of the generator is a salient pole transition type. The 4 magnetic poles of the rotor core and the magnetic dragon fan are integrated as a whole. A damper cage (well-connected operation) is provided on the surface of the rotor pole core. The generator has good performance indicators when the load is unbalanced and can reduce the overvoltage that appears on the rotor during dynamic processes. The rotor has a centrifugal fan.
Ⅲ. AC Exciter Stator
The stator of the exciter is used to generate a magnetic field. It has multiple magnetic poles to improve the positivity of the exciter. The AC mid-field converter rectifier issued by the magnetic machine is rectified and supplied to the AC synchronous generator for magnetization.
Ⅳ. AC Excitation Armature
The rotor of the exciter is coaxial with the armature shaft and the earth generator. The armature winding is connected by a three-phase star connection method, and the neutral point is not led out, but there are 4 plummets} outgoing wires connected to the rotary rectifier (essentially 3 lead wires, but one phase is divided into two heads).
Ⅴ. Rotating silicon rectifier
The rotating silicon rectifier is fixed on the excitation armature bracket (the rectification device of the 90kW, 120kW generator is placed on the outside of the excitation end cover). There are 6 rectifier elements, of which the three elements with bolts as anodes are fixed to the I'-round conductive Plate, and the other 3 bolts are used as the cathode components are fixed on another conductive plate. The two sets of components are insulated from each other and mounted on a common insulation ring, which becomes a silicon rectifier. The AC power comes from the AC exciter armature, and its DC output line passes through the shaft center and is connected to the rotor coil of the generator.
This type of generator base is welded with steel plates. The front and rear covers are made of cast iron, and the axial ventilation is self-cooled. The balance is supported by two bearings. The flange connected with the prime mover makes the unit easy to install.
Ⅰ. Stator
The stator is composed of a stator core, a stator, and a machine base. The core and stator windings are the parts that generate induced electromotive force and current. This part is called the armature. The stator core is an integral part of the magnetic circuit of the synchronous generator. In order to reduce the eddy current loss, the core is generally formed by laminating two silicon steel sheets with insulating paint. There are evenly distributed slots in the iron core to embed the armature winding. The stator winding of a diesel generator is composed of a coil wound with high-strength polyimide enameled copper wire, and the coil is embedded in the core slot according to certain technical requirements. When installing three-phase windings, they should be embedded symmetrically, forming a 120 "electrical phase angle with each other. Shamu is a bracket for the generator, which is used to fix the armature and support the rotor with the front and rear end covers. There is an outlet box, inside the box, and a wiring board to facilitate the extraction of AC power.
Ⅱ. Rotor
The rotor of the generator is a salient pole transition type. The 4 magnetic poles of the rotor core and the magnetic dragon fan are integrated as a whole. A damper cage (well-connected operation) is provided on the surface of the rotor pole core. The generator has good performance indicators when the load is unbalanced and can reduce the overvoltage that appears on the rotor during dynamic processes. The rotor has a centrifugal fan.
Ⅲ. AC Exciter Stator
The stator of the exciter is used to generate a magnetic field. It has multiple magnetic poles to improve the positivity of the exciter. The AC mid-field converter rectifier issued by the magnetic machine is rectified and supplied to the AC synchronous generator for magnetization.
Ⅳ. AC Excitation Armature
The rotor of the exciter is coaxial with the armature shaft and the earth generator. The armature winding is connected by a three-phase star connection method, and the neutral point is not led out, but there are 4 plummets} outgoing wires connected to the rotary rectifier (essentially 3 lead wires, but one phase is divided into two heads).
Ⅴ. Rotating silicon rectifier
The rotating silicon rectifier is fixed on the excitation armature bracket (the rectification device of the 90kW, 120kW generator is placed on the outside of the excitation end cover). There are 6 rectifier elements, of which the three elements with bolts as anodes are fixed to the I'-round conductive Plate, and the other 3 bolts are used as the cathode components are fixed on another conductive plate. The two sets of components are insulated from each other and mounted on a common insulation ring, which becomes a silicon rectifier. The AC power comes from the AC exciter armature, and its DC output line passes through the shaft center and is connected to the rotor coil of the generator.