Overall salient type intermediate-frequency brushless excitation synchronous generator

Abstract

The invention relates to an overall salient type intermediate-frequency brushless excitation synchronous generator, which comprises a main generator, an exciter, an excitation regulating system. The excitation regulating system consists of a compound excitation device, a rotating rectifier and an AVR automatic voltage regulator, wherein the compound excitation device consists of a compound excitation winding, a compound excitation current transformer and a three-phase rectifier bridge, the stator of the main generator adopts a fractional slot type short-range winding, the slot number per pole and per phase q is a fractional value, the rotor of the main generator is formed by lamination of multi-pole rotor core laminated pieces, the rotor core of the main generator is of an overall salient type rotor core structure and is formed by overall punching and lamination of rotor core laminated pieces, each rotor core laminated piece is formed with a magnetic pole and a magnetic yoke integrated, and an axial air-cooling hole is arranged at the magnetic yoke. The generator realizes the brushless excitation intermediate-frequency generation, outputs the single-phase or three-phase intermediate-frequency voltage, and has the advantages of excellent performance, stable and reliable operation and high output power.

Description

(1) Technical field: [0001] The invention relates to an intermediate frequency generator, in particular to a medium and high power integral salient pole type intermediate frequency brushless excitation synchronous generator. (2) Background technology: [0002] At present, there is an increasing demand for intermediate frequency generators in the market. For example, national defense facilities and related fields of the national economy require intermediate frequency power supplies, airports need mobile intermediate frequency power supplies for maintenance and repair of warehouse equipment and equipment, and industrial smelting needs. Intermediate frequency power supply of 400Hz and higher, etc. [0003] Existing intermediate frequency power sources are often obtained by frequency conversion of industrial frequency power sources. The frequency of power frequency power, that is, ordinary generators, is generally 50HZ or 60HZ. In order to obtain intermediate frequency power, variable ...

AI Technical Summary

Problems solved by technology

[0003] The existing intermediate frequency power supply is often obtained by frequency conversion of industrial frequency power supply. The power frequency of industrial frequency power supply, that is, the power generation frequency of ordinary generators, is generally 50HZ or 60HZ. In order to obtain intermediate frequency power supply, frequency conversion equipment and auxiliary facilities are needed. The disadvantages are: First, the investment is large, the equipment investment is much larger than that of a generator, the cost is high, there are many facilities, the maintenance workload and failure rate are also large, and the maintenance cost is high; the second is that the stability of the system is reduced through frequency conversion; the third is The generator rotor core generally adopts the traditional split salient pole rotor core. It consists of each independent pole core punching sheet stacked into a pole core, and then radially fixed and locked to the rotor yoke by pole screws. Not only is the structure complex, There are many manufacturing processes, inconvenient installation, poor reliability, high cost, and small heat dissipation area coefficient and poor cooling effect, which lead to an increase in the temperature of the generator rotor winding; Fourth, the power of the existing intermediate frequency generator is small, and it is large in the range of 500kw to 1000kW. The power of the intermediate frequency generator has not been reported

[0004] The traditional small-scale medium frequency generators are mostly permanent magnets, and the rotor poles or stator poles are permanent magnets. There are also shortcomings: First, the magnetic poles have no windings, and there is no way to adjust the excitation current, so the generator voltage cannot be adjusted; The second is that some permanent magnets may be gradually demagnetized under harsh conditions such as high-temperature operation or long-distance transportation, which will affect the stability of the generator voltage. Extremely difficult to install magnets

Images