Rated Voltage:220V/230V/240V/380V/400V Rated Current:5.4-3000A as request Speed:1500/1800rpm Frequency:50HZ/60HZ Output:100% Output Power Winding:100% Copper Wire Phase:Three Phase Color:As Request Warranty:1 Year
The brushless generator is actually composed of two generators, one as an exciter, one as the main generator, and a rotary rectifier composed of a diode (or thyristor). The main generator’s field winding is on the rotor and the armature winding is on the stator (the electrical output that will be emitted). The armature winding of the exciter is in the rotor and the field winding is in the stator.
1) Any permanent magnetic generators, providing invariable excitation on all occasions.
2) Easy to be connected with power network or other generators. Standard 2/3 pitches windings check excessive midline current.
3) Balanced rotor with single or two sealed ball bearings
4) Convenient installation and maintenance with easy access to terminals, rotating diodes and coupling bolts
The brushless generator consists of two generators, one as an exciter, one as the main generator, and a rotary rectifier composed of a diode (or thyristor).
The excitation current of a self-excited constant-voltage synchronous generator needs to flow into the generator’s excitation winding through a brush device (including carbon brushes and slip rings). The carbon powder worn by the carbon brushes and slip rings easily causes the insulation of the generator to drop, so it needs to be cleaned and maintained frequently. In addition, the electric sparks generated by the brush device are likely to affect radio communications, which is causing false alarms and malfunctions in the automatic engine room. Therefore, the brushless excitation system came into being, that is, the excitation current of the generator was provided by the AC exciter, which belongs to the form of separate excitation.
Usually synchronous generators use a rotating magnetic pole type, and AC exciters use a rotating armature type. The rotor and rotary rectifier of the AC exciter are on the same shaft as the generator rotor. In this way, the intermediate frequency AC power from the AC exciter is rectified into DC by the coaxial rotary rectifier and sent to the coaxial generator excitation winding, so it replaces carbon. Brush with slip ring.
The disadvantage of the brushless generator is that the electromagnetic inertia of the excitation system is large, so its dynamic characteristics are relatively poor. In order to improve the dynamic characteristics, the measures adopted are that the AC exciter uses an intermediate frequency. Due to the limitation of the generator volume and the required excitation power, the frequency of the AC exciter of most shipboard brushless generators is 100 ~ 150Hz. In addition, the manufacturing and installation process of the brushless power SJLX-inch rotary rectifier is relatively high.
The brushless excitation method generally refers to the excitation form of the AC exciter. There are two main types of brushless excitation methods used in shipboard brushless generators.
Directly controlled excitation The excitation power of the AC exciter comes directly from the outgoing end of the generator. When the generator is under pressure, the remanence of the main magnetic pole of the rotor generates a remanent voltage in the generator stator. This remanent voltage excites the stator winding of the AC exciter through an automatic voltage regulator. An alternating current of intermediate frequency is induced, which is rectified into a direct current by a rotary rectifier, and is used as an excitation current of a generator magnetic field. This excitation method is simple and convenient, but the dynamic performance is slightly worse.
The controllable double-excitation excitation method is that the AC exciter has two sets of secondary currents provided by the current mutual inductance of WE1 and WE2, and provides a proper amount of excitation power to the WE1 winding through a rectifier bridge. One winding WE2 provides a certain excitation power. The exciting current of the exciting winding WE1 is proportional to the change of the load current, that is, it has the function of current re-excitation, so its dynamic performance is excellent. Because the power current transformer is added, its corresponding cost and volume are increased.
The working principle of the brushless alternator is to provide excitation to the field winding of the exciter on the stator. The rotor armature winding will emit AC power. After rotating the rectifier, the rotor will supply power to the field winding of the main generator in the rotor, so that the main The generator induces the required alternating current in the armature windings of the stator. This is the “brushless” working principle of general alternators.
When repairing, first remove the vacuum pump at the rear of the generator, separate each silicon element and the connection wire with the stator winding with a soldering iron, measure the resistance value of the positive and negative silicon elements, and replace if abnormal. Then measure the insulation of the stator windings against the shell, and check the resistance value of the exciting winding (19 ~ 20Ω). If the resistance of each part is normal, you can check whether the special oil seal of the generator vacuum pump is damaged.