Quintuple harmonic excitation brushless synchronous generator

Abstract

The invention discloses a quintuple harmonic excitation brushless synchronous generator, which is characterized in that: the generator consists of a main generator and an alternating current exciter, which are arranged coaxially; the direct current excitation source of a stator pole winding of the alternating current exciter is taken from a direct current source; wherein a triphase quintuple harmonic winding in a stator core of the main generator is rectified into the direct current power supply by a rectifier; the generator has 60 stators, 4 poles and three phases; and the rotor of the main generator is made into an integral salient pole type. The quintuple harmonic excitation brushless synchronous generator overcomes the shortcoming that the fundamental harmonic excitation has low shortcircuit current ratio and electromagnetic interference, and also overcomes the shortcoming that when the triple harmonic exciters are connected in parallel, the neutral current has great demagnetizingeffect on triple harmonic excitation magnetic field. Therefore, the quintuple harmonic excitation brushless synchronous generator has the characteristic of better electrical property than that of thefundamental harmonic excitation and the triple harmonic excitation brushless synchronous generator.

Description

Fifth harmonic excitation brushless synchronous generator technical field The invention relates to a power supply device, in particular to a fifth harmonic excitation brushless synchronous generator. Background technique At present, there are three main excitation sources for the stator poles of the coaxial AC exciter of the existing brushless synchronous generator: 1. From the main winding; 2. From the auxiliary winding in the stator; 3. From the auxiliary exciter. Among them, 1. The main winding method has defects such as no excitation power supply when the motor is short-circuited, and interference with the output voltage of the host. 2. There are mainly two types of auxiliary windings taken from the stator, one is the fundamental auxiliary winding with the same number of poles as the main motor; the other is the third harmonic winding with the number of poles three times that of the main motor; the former There is mutual interference with the main winding, and it is...

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Problems solved by technology

Among them, 1. The main winding method has defects such as no excitation power supply when the motor is short-circuited, and interference with the output voltage of the host.

2. There are mainly two types of auxiliary windings taken from the stator, one is the fundamental auxiliary winding with the same number of poles as the main motor; the other is the third harmonic winding with the number of poles three times that of the main motor; the former There is mutual interference with the main winding, and it is greatly affected by the armature reaction. The steady-state short-circuit current multiple of the motor is difficult to be equal to or greater than 3 times, and the three-phase third harmonic excitation winding also has electromagnetic interference with the main winding, and the generator runs in parallel. , the third harmonic current of the neutral line acts as a demagnetizer, and the motor is prone to vibration and unstable operation when connected in parallel

3. It is taken from the auxiliary exciter, especially the permanent magnet auxiliary exciter (PMG), which overcomes the defects of the first two types in terms of electrical performance, but there is an additional auxiliary exciter in the structure, and the whole motor is composed of the main generator and AC excitation. Exciter and auxiliary exciter are composed of three coaxial machines, the axial length of the motor is long, the volume increases, the weight increases, the cost increases, and the use is limited in many occasions

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