Electro-magnetic doubly-salient electric generator with two three-phase four-wire rectification double-capacitor excitation windings

Abstract

The invention relates to an electro-magnetic doubly-salient electric generator with two three-phase four-wire rectification double-capacitor excitation windings. The electro-magnetic doubly-salient electric generator with the two three-phase four-wire rectification double-capacitor excitation windings is characterized in that the non-dotted terminals of an A-phase winding, a B-phase winding and a C-phase winding are connected to form a neutral conductor, connection points of a capacitor C1 and a capacitor C2 are led out through wires, the dotted terminals of the A-phase winding, the B-phase winding and the C-phase winding are connected with the positive electrodes of an upper bridge diode D1, an upper bridge diode D3 and an upper bridge diode D5 respectively and also connected with the negative electrodes of a lower bridge diode D2, a lower bridge diode D4 and a lower bridge diode D6, so that a bridge rectifier is formed, the positive terminal of the capacitor C1 is connected with the positive terminal of a rectifier bridge, the negative terminal of the capacitor C2 is connected with the negative terminal of the rectifier bridge, the second excitation winding Lf2 is connected to a bus in series, one end of the second excitation winding is connected with the positive terminal of the capacitor C1, the other end of the second excitation winding is led out to serve as the positive electrode of the electric generator, a wire is led out of the negative terminal of the capacitor C2 to serve as the negative electrode of the electric generator, and the positive electrode and the negative electrode of the electric generator are connected with the positive electrode and the negative electrode of a load Z, so that power is supplied to the load; when the electric generator is idle, the output voltage U0 of the electric generator can be regulated by regulating the exciting current if1, and thus the output voltage U0 is kept constant. According to the electro-magnetic doubly-salient electric generator with the two three-phase four-wire rectification double-capacitor excitation windings, due to the existence of the neutral conductor, a channel is provided for harmonic waves, the direct-current output voltage is increased, and the performance and efficiency of the electric generator are improved.

Description

technical field [0001] The invention belongs to the technical field of special generators, in particular to an electrically excited double salient pole generator with three-phase four-wire rectification, double capacitors and double excitation windings. Background technique [0002] The stator and rotor of the electrically excited double salient pole generator are both salient pole structures, which belong to variable reluctance motors, do not need rotor position sensors and power converters, and have high system reliability. The electric excitation doubly salient generator replaces the permanent magnet with the excitation winding, so that the excitation magnetic field of the generator can be adjusted. There are no windings and permanent magnets on the rotor, the structure is very simple, the operation is reliable and the cost is low; when the load of the generator changes, the excitation current in the excitation winding can be adjusted to maintain a constant voltage outpu...

AI Technical Summary

Problems solved by technology

Due to the particularity of the potential waveform, the electric excitation double salient pole generator contains a large number of harmonics. When the three-phase three-wire star connection is used to rectify the output, on the one hand, in order to reduce the DC voltage ripple, it is often necessary to equip a DC filter inductor Or increase the capacitance and increase the cost; on the other hand, some harmonics in the winding potential, such as the third harmonic, will be offset, and these harmonics have a large content in the total potential, which will affect the electric excitation double salient pole power generation machine output

Images