Sine duplex lap winding for synchronous generator

Abstract

The invention relates to a sine duplex lap winding for a synchronous generator. The sine duplex lap winding for the synchronous generator is characterized in that the generator has 30 stator slots, 4 electrodes and 3 phases; and a stator iron core is inclined for about 1.07 slot distance, six hollow slots of the 30 slots are uniformly distributed, and the rest 24 slots are arranged in that three-phase windings are arranged according to the method of two slots per electrode and phase to form the three-phase duplex lap winding, wherein the number of turns of each coil of the three-phase winding is the same, and the pitch of each coil is 5. The line voltage and phase voltage of the three-phase generator armature winding formed by the way theoretically have no third harmonic and third harmonic of the odd times, has no fifth harmonic and seventh harmonic, the tooth harmonic is greatly weakened, the contents of eleventh harmonic and thirteenth harmonic are small, the line-voltage and phase-voltage sinusoidal waveform distortion rates are not more than 1 percent, thereby meeting the high requirement of a three-phase four-line system precision power supply for that the line-voltage and phase-voltage sinusoidal waveform distortion rates are not more than 1 percent, and no coils are arranged in the six hollow slots of the stator iron core, which is beneficial for the axial ventilation and heat dissipation of the generator.

Description

Technical field [0001] The present invention involves an AC motor winding, especially a synchronous generator sine dual section. Background technique [0002] As we all know, when the three -phase synchronous generator is made into a three -phase and four -line power supply, it is required that the generator line and phase voltage sinusarity are small. In some precision power supply, the voltage phase voltage phase voltage sine is not greater than the voltage.1%. [0003] In order to meet this high requirement, the design of its engine winding is one of the key technologies. Among the number of stator grooves is 30 slot 4 pole 3 phase hair motor, each pole and each phase slot number q = 5 / 2, the engine winding sine design encounters difficulties. Due to the requesting three -phase and four -line power supply, the conventional design adopts a short -distance 2 / 3 winding, which can eliminate the harmonics of 3 times and its odd several times, but 5The 7 harmonics are large, that is...

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Problems solved by technology

[0003] In order to meet such high requirements, the design of its armature winding is one of the key technologies. In a stator slot number of 30 slots, 4 poles, 3 phase generator , the number of slots per pole and phase is q=5 / 2, and the sinusoidal design of the armature winding encounters difficulties. Due to the requirement of three-phase four-wire power supply, the conventional design adopts short-distance 2 / 3 windings, It can eliminate the 3rd and its odd multiples of harmonics, but the 5th and 7th harmonics are very large, that is, it is impossible to eliminate the 3rd and its odd multiples of harmonics and the 5th and 7th harmonics at the same time, and greatly weaken other harmonics Harmonic, and the △-Y sinusoidal double-layer winding and concentric unequal-turn sinusoidal double-layer winding disclosed in the past, because of the strict turn ratio relationship, it is difficult to unify the number of theoretical turns and the actual number of turns. In this motor In fact, it cannot be used, and a new winding structure design must be required to simultaneously eliminate the harmonics of 3 and its odd multiples and the 5th and 7th harmonics, and greatly weaken other harmonics to meet the requirements of this generator. When the three-phase four-wire system supplies power, the sinusoidal distortion rate of the line voltage and phase voltage waveform is not more than 1%.

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