CN201478900U

CN201478900U - Compound three-phase magneto for voltage regulation

Info

Publication number: CN201478900U
Application number: CN200920185198XU
Authority: CN
Inventors: 林政安
Original assignee: Tellhow Sci Tech Co Ltd
Current assignee: Tellhow Sci Tech Co Ltd
Priority date: 2009-05-27
Filing date: 2009-05-27
Publication date: 2010-05-19
Anticipated expiration: 2019-05-27

Abstract

The utility model relates to a compound three-phase magneto for voltage regulation, which is characterized in that a stator core is provided with two sets of three-phase symmetrical winding, wherein a permanent magnet is arranged in a rotor, one of the two sets of three-phase symmetrical winding in the stator core is a main winding which adopts a three-phase symmetrical AC winding with a tapping, the other set thereof is an auxiliary winding which adopts a three-phase symmetrical AC winding with the same pole number, phase and type as the main winding and without a tapping, both sets of winding adopt alternate type winding with two different pitches, the turn ratio of the big pitch and the small pitch away from the coil is fixed as 2:1, and as relevant tapping is switched on or switched off as required by different working conditions, the size of the output voltage can be changed. The utility model has the following technical effects that firstly, the voltage regulation of the magneto can be realized without the electrical field excitation, thereby simplifying the structure and reducing the cost, secondly, the manufacturability is excellent, the magnetic potential harmonic wave content is small, and the motor performance is excellent, and thirdly, the voltage regulation rate be limited within 3% without an electronic voltage regulator, the reliability is high, and the use is convenient.

Description

The three-phase permanent magnet electricity generator of composite voltage regulating

Technical field

The utility model relates to a kind of power-supply device, relates in particular to a kind of three-phase permanent magnet electricity generator of composite voltage regulating.

Background technology

Three-phase permanent magnet electricity generator pressure regulation difficulty, existing composite excitation mode solves this difficulty, can realize pressure regulation, but the composite excitation mode needs the additional electrical excitation generator, make and be actually the mixed structure pattern that a permanent magnet generator adds such two generators of electric excitation generator, complex structure cost height, the advantage performance of permanent magnet excitation is very limited.For simplified structure reduces cost, bring into play the advantage of permanent magnet excitation generator better, the pressure regulation method that the invention three-phase permanent magnet electricity generator is new is necessary.

Summary of the invention

The purpose of this utility model has been to provide a kind of three-phase permanent magnet electricity generator of composite voltage regulating, it is the tap of conversion main winding that this generator is one, to realize that changing the main winding number of turn reaches the size that changes output voltage, one is to utilize auxiliary winding magnetic potential to have or do not have, the big still little main winding armature mmf that changes, from and increased a means of regulating main winding output voltage size, the method that is different from composite excitation, compare with the composite excitation method, designs simplification, axial length is short, and cost reduces, have bigger economy and practicality, and be convenient to promote.

The utility model is achieved like this, it comprises stator and rotor, it is characterized in that generator has only a stator and a rotor, be furnished with permanent magnet in the rotor, two cover three-phase symmetric windings are arranged in the stator, first cover is a main winding, main winding is a kind of three-phase symmetrical alternating current winding with tap, second cover is auxiliary winding, auxiliary winding be with main winding with the number of poles same-phase with pattern but there is not the three-phase symmetrical alternating current winding of tap, two cover windings all are the repeatedly formula windings with two different pitches, but coarse pitch is different with the fine pith coil turn, and coarse pitch and fine pith turns ratio are got 2: 1 fixed relationship, main winding is every to have two taps mutually, three-phase is totally six taps, is switched on or switched off relevant tap according to different operating modes, then changes the size of output voltage; The every string mutually of auxiliary winding has the electric capacity of symmetry, and when forming closed circuit, auxiliary winding produces independently magnetic potential, and closed circuit disconnects, and no current flows through in the then auxiliary winding, does not form additional magnetic potential.

Technique effect of the present utility model is: 1, got rid of the electric excitation generator in the Hybrid Exciting Permanent Magnet Generator, need not be electric the excitation part just can realize the pressure regulation of permanent magnet generator, the reduction of designs simplification cost; 2, two cover three-phase symmetric winding patterns are unified, simple in the stator, good manufacturability, and the harmonics of magnetic force content is little, and motor performance is good; 3, voltage regulation can be in 3%, need not electronic voltage controller (AVR), and the reliability height, easy to use.

Description of drawings

Fig. 1 is a stator winding layout plan of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

Embodiment

Implement a 12KW three-phase permanent magnet electricity generator, number of stator slots Z=24, number of poles 2P=2, number of phases m=3.Stator winding figure, as shown in Figure 1, the stator main winding is a kind of lap winding type winding of two kinds of different pitches, every middle mutually coarse pitch coil turn is that fixed relationship was 2: 1 with the ratio of fine pith coil turn.With the U phase winding is that example is described below:

Big coil span is 96 coils that have, and they are 1-10,2-11,3-12,22-13,23-14,24-15;

The small coil pitch is 44 coils that have, and they are 4-8,5-9,21-17,20-16;

Each big coil turn and each small coil turn ratio are fixed relationship 2: 1; U, V, W three is symmetrical, and promptly the U phase winding is UN, and the V phase winding is VN, and the W phase winding is that WN arranges, 120 ° of electrical degrees of mutual deviation are though the VN that do not draw among the figure, that WN VN, WN form pattern is fully the same with UN, so do not repeat them here.The U phase winding is UN, is by UU ₂, U ₂U ₁, U ₁These three windings in series of N form, and two taps are arranged is U ₁, and U ₂, it is worthy of note U ₁N, U ₂U ₁, UU ₂In big small coil is all arranged, during this example is implemented, U ₁The N winding coil number of turn from big to small is 16,16,16,8,8; U ₂U ₁The winding coil number of turn from big to small is 2,2,2,1,1; UU ₂The winding coil number of turn from big to small is 2,2,2,1,1; V in like manner ₁N, V ₂V ₁, VV ₂W ₁N, W ₂W ₁, WW ₂The pattern number of turn is all with above-mentioned the same, and the VN winding of V phase is by VV ₂, V ₂V ₁, V ₁These three windings in series of N form, and two tap V are arranged ₁And V ₂The WN winding of W phase is by WW ₂, W ₂W ₁, W ₁These three windings in series of N form, and two tap W are arranged ₁And W ₂U, V, W, N three-phase four-wire system; In like manner auxiliary winding three-phase a, b of stator, c are made up of a0, b0, c0 three-phase symmetric winding respectively, the complete and U of a0 pattern ₁N is similar, but the winding coil number of turn from big to small is 4,4,4,2,2, a0, b0, the outlet of c0 three-phase and four-line connection are a, b, c, 0, these features of said stator main winding and auxiliary winding, guarantee that harmonic magnetic potential content is little, through the fourier series sorrow analysis in the facies tract magnetic potential that this two covers winding forms when flowing through electric current, do not contain as can be known 3 times and 3 multiple subharmonic, 5 times, 7 subharmonic content also very little, so good voltage waveform, vibrating noise is little, and the assorted consumption of harmonic wave is little, the efficient height, the performance of generator is good.

As shown in Figure 2, U, V, W, N are that the generator main winding is powered by three-phase four-wire system Y connection, and N is the neutral line, and output token is U, V, W, N.Every have two taps mutually, as U U arranged mutually ₁, U ₂, V has V mutually ₁, V ₂W has W mutually ₁, W ₂U ₁U ₂, V ₁V ₂, W ₁W ₂Between be connected to normally closed switch K ₁And the resistance R of adjusting ₁, U2U, V ₂V, W ₂Be connected to normally closed switch K between W ₂And the resistance R of adjusting ₂, select the suitable resistance R of adjusting ₁And R ₂Value, the output voltage in the time of can adjusting unloaded and load (COS=1).Auxiliary winding a, b, c three-phase and U, V, W three same phases, each goes here and there a, b, c three-phase capacitor C is arranged, seal in capacitor C after line end be labeled as a ', b ', c ' respectively; Between a ' and b ', b ' and c ' is connected to normal open switch K3, the neutral line of a, b, c three-phase be 0 and the neutral line N of U, V, W between also be connected to normal open switch K4.

The working method according to the form below:

By this complex method pressure regulation, the three-phase permanent magnet electricity generator voltage regulation is less than 3%, and the ability that starts asynchronous motor is strong, and directly starting power is greater than the threephase asynchronous of this machine rated power 70%.As seen three-phase permanent magnet electricity generator of the present invention need not the additional electrical exciter, and voltage regulation is reached in 3%, and pressure regulating performance is good, and is simple in structure, and cost is low, good economy performance, reliability height.

Claims

1. the three-phase permanent magnet electricity generator of a composite voltage regulating, it comprises stator and rotor, it is characterized in that generator has only a stator and a rotor, be furnished with permanent magnet in the rotor, two cover three-phase symmetric windings are arranged in the stator, first cover is a main winding, main winding is a kind of three-phase symmetrical alternating current winding with tap, second cover is auxiliary winding, auxiliary winding be with main winding with the number of poles same-phase with pattern but there is not the three-phase symmetrical alternating current winding of tap, two cover windings all are the repeatedly formula windings with two different pitches, but coarse pitch is different with the fine pith coil turn, and coarse pitch and fine pith turns ratio are got 2: 1 fixed relationship, and main winding is every to have two taps mutually, three-phase is totally six taps, and the every string mutually of auxiliary winding has the electric capacity of symmetry.