Permanent magnet type alternating-current synchronous generator with novel structure

Abstract

A permanent magnet type alternating-current synchronous generator with a novel structure is suitable to be used as a standby power source of a generating set of a gasoline engine. The permanent magnet type alternating-current synchronous generator is characterized in that a generator is a hollow permanent-magnetic rotor structure consisting of an inner stator, an outer stator and an iron core without a magnetic yoke, independent windings 3 and 4 are embedded in grooves of an inner stator iron core 2 and an outer stator iron core 5, a hollow permanent-magnetic rotor is positioned between the inner stator and the outer stator, two surfaces with different polarities of a permanent magnet 6 are directly connected with the stator so as to form a closed magnetic circuit 12, the permanent magnet 6 is a flat-plate rectangular structure and is embedded into a guide magnetic ring 9 made of ferromagnetic materials, a plurality of magnets with identical polarities are arrayed in the magnet to form each magnetic polarity, the magnetic circuit is a composite magnetic circuit structure, the magnets, with identical polarities, of the magnetic circuits are connected parallelly, the magnets, with different polarities, of the magnetic circuit are serially connected, the guide magnetic ring 9 is an asymmetric structure, residual ferromagnetic materials are reserved on a pole after the guide magnetic ring 9 rotates clockwise, the magnets with different polarities are in rivet weld by non-magnetic stainless steel connecting rings 8 to form a barrel, and two ends of the barrel are connected with an inner stator supporting shaft 1 by a front rotary support and a rear rotary support via rolling bearings.

Description

technical field [0001] The present invention is a permanent magnet AC synchronous generator with a new structure with high power density and compound excitation voltage stabilization characteristics. It is matched with a gasoline engine or a diesel engine to form a generator set, which can be used as a portable power supply and a backup emergency power supply. Background technique [0002] At present, the mainstream model in the gasoline generator industry is a brushed electric excitation type generator based on copper wire and aluminum wire, and the power range covers 1kW to 20kW. At present, domestic and foreign gasoline generator sets basically use brushed electric excitation single-phase or three-phase AC generators with AVR to adjust the excitation current. The biggest advantage of this generator is that its magnetic field can be automatically adjusted by adjusting the rotor excitation current. In this way, the single-unit generator can maintain the stability of the out...

AI Technical Summary

Problems solved by technology

With the advancement of control technology, rare earth permanent magnet motors have been widely used in the field of motor drive. Motor products made of rare earth permanent magnet materials have high power density per unit volume of materials, high motor efficiency and low energy consumption. Display It shows the great superiority of rare earth motors; however, the use of rare earth permanent magnet materials in the field of generators has been restricted by the bottleneck of voltage stabilization technology. Since the generator magnetic field made of permanent magnet materials cannot be adjusted, the generator terminal voltage control is very difficult. Difficult, the voltage drop of the motor with load is very severe, which in turn affects the power generation quality of the permanent magnet generator set, and limits the application range of permanent magnet materials on this type of generator

Moreover, simply using rare earth materials to replace the rotor windings of electric excitation generators according to the traditional motor practice cannot fully and thoroughly utilize the advantages of rare earth materials to transmit high energy density

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