CN1705211A - Multi-three-phase permanent magnet synchronous motor rectified by an inverter - Google Patents

Abstract

This invention refers to more three-phase permanent magnet synchronous generator power supplied by inverter, which contains plurality of groups of three-phase symmetry windings independent in circuit, there is only magnetic circuit coupling among groups without direction relation in electric circuit, the each star connected three-phase windings has independent zero point, the angle connected windings is independent, the total windings phases are multiple times of three, e.g. 2X3, 3X3...NX3 (n is the positive integer greater than 2), said generator is worked by being rectified of PWM by more three-phase inverter, the corresponding phase difference in adjacent three-phase windings is Pi/(nX3).

Description

Many three-phase permanent synchronous generators of inverter rectification

Technical field:

The present invention relates to a kind of many three-phase permanent synchronous generators of inverter rectification.

Background technology:

Three-phase permanent synchronous generator generally is applied to wind power generation, oceanic tide generating, hydroelectric power generation and aviation electricity generation system iso-variable velocity constant frequency generation field.Be characterized in that motor rotor construction is firm, it is big to adapt to rotation speed change, system has obtained extensive use at variable speed constant frequency.Because such motor does not have the ability of constant voltage constant frequency, the type motor generally adopts the pattern of carrying out direct current output generating after the general-purpose diode three-phase bridge rectification in actual applications.Renewable energy power generation begins to adopt dexterity direct current transportation mode at present.And adopt the prerequisite of direct current transportation is that direct current network will have a stable transmission voltage.Therefore, three-phase permanent synchronous generator adopts inverter PWM commutation supply voltage mode, still can the constant electricity generation system of sustaining voltage begin to be applied during variable-speed operation.Its inverter section generally adopts conventional three-phase ac-dc-ac inverter device, also has to adopt traditional polyphase machine and heterogeneous converter plant.But, the high-power permanent magnet synchronous motor system of conventional three-phase inverter rectification is because the restriction of the physical parameter of power semiconductor, often need to adopt a plurality of power semiconductor parallel connections can solve on a three-phase brachium pontis, perhaps adopt many level cascade structure to solve on the three-phase brachium pontis by high-tension problem by the problem of big electric current.The reliability that will cause system like this reduces problem.Polyphase system can reduce the rated value of the voltage and current of each phase winding of synchronous motor, can reduce for the requirement of the physical parameter limit of power semiconductor.The fundamental magnetic potential that can prove polyphase machine is that the magnetic potential of circular rotating magnetic potential and its space high order harmonic component is along with the increase of number of motor phases can be eliminated effectively.

The number of phases of supposing traditional polyphase machine is m, and a certain phase current has following mathematic(al) representation:

$i_k=\sqrt{2}I\cos (\mathrm{\ωt}-k\frac{\mathrm{\π}}{m});k=\mathrm{1,2}...n----\left(1\right)$

Wherein I is the effective value of certain phase current; ω is the angular speed of power supply.

The first-harmonic pulsating magnetic potential of its a certain phase is:

$f_k=F_{\mathrm{\φ}1}\cos (x-k\frac{\mathrm{\π}}{m})\cos (\mathrm{\ωt}-k\frac{\mathrm{\π}}{m})----\left(2\right)$

In the formula (2) $F_{\mathrm{\&phi;}1}=\frac{2\sqrt{2}}{\mathrm{\&pi;}}\frac{\mathrm{Iw}}{\mathrm{<figure-callout\; id="1"\; label="p\; k\; w"\; filenames="A20041001031200121.png,A20041001031200131.png"\; state="\{\{state\}\}">p</figure-callout>}}{k}_w{1}_{};$ F _{φ 1}It is the fundamental magnetic potential of each phase of polyphase machine; W is the turns-in-series of each bar parallel branch of each phase winding; P is the number of pole-pairs of motor; k _W1It is first-harmonic winding winding coefficient.The always synthetic magnetic potential ripple of then traditional polyphase machine first-harmonic is:

$f(x,t)=\underset{0}{\overset{m-1}{\mathrm{\&Sigma;}}}{F}_{\mathrm{\&phi;}1}\cos (x-k\frac{\mathrm{\&pi;}}{m})\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m})=\frac{m}{2}{F}_{\mathrm{\&phi;}1}\cos (x-\mathrm{\&omega;t})----\left(3\right)$

Obviously the first-harmonic resultant magnetic field is the rotating magnetic potential ripple of a circle.

For the high order space harmonics, adopt polyphase windings can weaken the influence of high order harmonic component effectively to motor, the number of phases of supposing polyphase machine is m, can prove, under the situation of winding symmetry with the winding space angle is

Condition under, the expression formula of its first-harmonic and high order harmonic component is as follows:

v＝2km±1 (4)

Suppose m=12, then except first-harmonic, the harmonic wave of its minimum number of times is for-23 counter-rotating harmonic waves and just changeing harmonic wave+25 times, and promptly to be lower than 23 times humorous wave amplitude be zero to harmonic number.

Though polyphase machine is very capable for the inhibition of space harmonics, but because the winding connectivity scenario of polyphase machine generally adopts star connection, its polyphase windings is connected on the mid point jointly, the electric current of the common mid point of its winding is very big, the problem of heating and local current imbalance is comparatively outstanding, has influenced the reliability of poly-phase permanent magnet synchronous motors work.Simultaneously, Chang Gui three-phase permanent-magnetic synchronous motors system is simply more many than the control strategy of heterogeneous permanent magnet synchronous motor system on control strategy.The complexity of its control of poly-phase permanent magnet synchronous motors system is along with 2 ^m(m is the number of phases of polyphase machine) and increase.For the poly-phase permanent magnet synchronous motors of the different numbers of phases, the otherness of its control method is very big, because the influence of above factor, the application of traditional poly-phase permanent magnet synchronous motors has been subjected to certain restriction.Therefore, the effect of seeking a kind of composite magnetic power is identical with poly-phase permanent magnet synchronous motors, overcome the mid point heating of polyphase synchronous machine and the shortcoming of poor reliability, simultaneously, the winding construction of the novel poly-phase permanent magnet synchronous motors that the standardization of control algolithm is good is very significant work.

The application that the synchronous generator of powering behind the poly phase rectification that polyphase machine adopts a plurality of star windings to be formed has been succeeded in stand alone generating systems such as boats and ships, the people such as Ma Weiming of naval engineering university have studied the synchronous generator that a kind of three-phase alternating current and poly phase rectification are powered simultaneously.Wherein, the polyphase windings of this synchronous generator is to give the DC load rectification after connecting uncontrollable rectifier through conventional bridge-type.Since the phase place of the stator current of rectification polyphase synchronous generator be by this phase winding in the position in space spontaneous definite, do not need to carry out artificial phase control, therefore, it only needs by regulating the exciting current of rotor, the amplitude size that just can regulate stator current.For adopting a plurality of star windings to form the magneto alternator that adopts inverter PWM commutation supply voltage, situation then than the synchronous generator complexity of powering behind the employing poly phase rectification many.

Summary of the invention:

The present invention relates to a kind of many three-phase permanent synchronous generators of inverter rectification.The stator winding of this motor has many groups three-phase symmetric winding independently on circuit, the mutual coupled relation that magnetic circuit is only arranged between the group of these symmetrical three phase windings and the group, there be not contacting directly on the circuit, adopt three phase windings of Y-connection for each group, all have independent neutral point separately, and these neutral points are isolated mutually on circuit; For three phase windings that each group adopts the triangle connection, these three phase windings are isolated mutually on circuit also is.The total number of phases of many three-phase permanent synchronous generators stator winding has 3 multiple feature, promptly total number of phases of this motor is: 2 * 3 phases, 3 * 3 phases, 4 * 3 phases, 5 * 3 phases, 6 * 3 phases, 7 * 3 phases, 8 * 3 phases ... n * 3 phase (n=2,3,4..., n are the positive integer greater than 2).For the schematic diagram of many-its prototype machine of three phase electric machine with independent mid point referring to Figure of description 1.For have a plurality of dihedral connections many-schematic diagram of its prototype machine of three phase electric machine is referring to Figure of description 2.In the accompanying drawings, sense of current is followed motor rule.

Because the permanent magnet synchronous motor that adopts the permanent magnet synchronous motor of the polyphase inverter rectification that a plurality of stars or delta windings connect or be called the rectification of many three-phase inverters need adopt the Collaborative Control of a plurality of stars or a plurality of Atria phase windings and have the decoupling zero control problem of mutual inductance coupling.Therefore the control complexity of the control of the permanent magnet synchronous motor of the polyphase inverter rectification that connects of a plurality of stars or the delta windings synchronous generator of powering after than the poly phase rectification that adopts a plurality of star windings to be formed is many.But, adopt the permanent magnet synchronous motor of polyphase inverter rectification owing to adopt a plurality of stars or the delta windings connection, the method for attachment of its winding is more flexible, can adopt a plurality of star mid points, and its a plurality of star mid points are mutually independently on circuit; Also can adopt a plurality of delta windings, not have the mid point of winding this moment.It is higher that this motor has kept the reliability of polyphase machine, adopted many three-phases winding construction, can effectively reduce the rated value of the voltage and current of each phase, requirement for the physical parameter limit of power semiconductor can reduce, having overcome all windings of traditional polyphase machine star connection simultaneously all must be connected on the mid point, the electric current of mid point is very big, the comparatively serious problem of problem of heating and local current imbalance.Many three-phase permanent synchronous generators control method is compared comparatively simple with traditional poly-phase permanent magnet synchronous motors, simultaneously, control algolithm standardization level height, its basic Be Controlled unit are each independently three phase windings, and the control algolithm of all independently three phase windings is all identical.No matter the angle that produces from electric machine rotary magnetic field is that three phase windings, polyphase windings, many three phase windings can produce rotating magnetic field.

At first analyze a kind of many three-phase permanent synchronous generators with many-three phase windings.Many-three phase winding synchronous machines as its name suggests, the synchronous machine that has a plurality of independent three-phases exactly, its feature of how much is: the Y that the inside of synchronous machine winding has a plurality of independent neutral points connects three phase windings or a plurality of independently △ connects three phase windings, its each independent three phase winding inside, geometrical relationship and conventional three phase windings are identical, and the phase difference between every phase is 120 ° of symmetries.Between the three adjacent phase windings, the phase difference of its corresponding phase is π/(n * 3) or 0≤β＜π/(n * 3).The selection principle of phase difference that each of its many three-phases is organized the adjacent winding correspondence of independent three-phase mainly is 1. to eliminate specific subharmonic; 2. be convenient to the spatial arrangement of winding in motor stator.If for when eliminating the space high order harmonic component and mainly determine factor as the winding phase difference, when phase difference equaled π/(n * 3), the scope of eliminating the space high order harmonic component compared broad.For the purpose of analyzing, among the present invention, a plurality of independently Y are discussed respectively connect many three phase windings that many three-phases winding system that three phase windings form and a plurality of independently dihedral connection three phase windings are formed.

Advantage of the present invention: after 1. adopting the present invention, many three-phase permanent synchronous generators are compared with the heterogeneous technology asynchronous machine of existing tradition, owing to adopted star winding or a plurality of independently delta windings of a plurality of independent mid points, compare with traditional polyphase machine, overcome shortcomings such as polyphase machine mid point wiring complexity, reliability reduction, mid point heating.Have characteristics such as wiring is fairly simple, winding reliability height.2. after adopting the present invention, the reliability of magneto alternator system can effectively be improved.Since adopt the independent three-phase system operational mode of many groups, when the element of a certain phase breaks down, can be out of service, and other independent three-phase systems still can keep normal operating condition.Like this, the reliability of operation of system has obtained effective raising.

Many three-phase permanent synchronous generators composite magnetic power

We at first carry out theory analysis to the character of the first-harmonic composite magnetic power of many three-phase permanent synchronous generators.

Suppose that this prototype machine has m=n * 3 phase windings, for the two mutually Y of standard 3 phases, 6,9 phase 3Y, 12 phase 4Y ...., n=1,2,3,4 ...; For the two mutually △ dihedral connections of standard 3 mutually single △ dihedral connections, 6,9 phases, 3 △ dihedral connections, 12 phases, 4 △ dihedral connections, n=1,2,3,4 .....The connection of electricity is arranged in each three phase winding inside, and be not electrically connected the contact of having only magnetic field between independent three phase windings.

At first analyze, the rotating magnetic potential of many-three phase electric machine is set up process, supposes that the fundamental current of the excitation power supply of some independent three-phases has following mathematic(al) representation:

$\begin{array}{c}{i}_{\mathrm{ak}}=\sqrt{2}I\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m})\\ i_{\mathrm{ak}}=\sqrt{2}I\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m}-\frac{\mathrm{\&pi;}}{3})\\ i_{\mathrm{ak}}=\sqrt{2}I\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m}+\frac{\mathrm{\&pi;}}{3})\end{array}----\left(5\right)$

The magnetic potential amplitude of some independence three phase windings is F _φ, pulsation is ω, air gap surface certain a bit its coordinate be x, then alternating current in the expression formula of each pulsating magnetic potential that produces mutually of the inside of this independent three-phase is:

$f_{\mathrm{ak}}(x,t)=F_{\mathrm{\&phi;}1}\cos (x-k\frac{\mathrm{\&pi;}}{m})\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m});k=\mathrm{0,1,2},...n-1----\left(6\right)$

$f_{\mathrm{bk}}(x,t)=F_{\mathrm{\&phi;}1}\cos (x-k\frac{\mathrm{\&pi;}}{m}-\frac{2\mathrm{\&pi;}}{3})\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m}-\frac{2\mathrm{\&pi;}}{3});----\left(7\right)$

$f_{\mathrm{ck}}(x,t)=F_{\mathrm{\&phi;}1}\cos (x-k\frac{\mathrm{\&pi;}}{m}+\frac{2\mathrm{\&pi;}}{3})\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m}+\frac{2\mathrm{\&pi;}}{3});----\left(8\right)$

Note the F in the formula _{φ 1}Definition identical with the definition in the formula (2).

Then the always synthetic magnetic potential of the first-harmonic of many three phase windings is total magnetic potential stack of each independent three-phase, carries out total summation operation promptly formula (2), (3), (4) addition, and then with the magnetic potential of each independent three-phase, has following expression way:

$f(x,t)=\underset{0}{\overset{n-1}{\mathrm{\&Sigma;}}}[f_{\mathrm{ak}}(x,t)+f_{\mathrm{bk}}(x,t)+f_{\mathrm{ck}}(x,t)]----\left(9\right)$

Can prove that formula (5) can further be reduced to from mathematics:

$f(x,t)=\frac{3\&CenterDot;n}{2}{F}_{\mathrm{\&phi;}1}\cos (x-\mathrm{\&omega;t})=\frac{m}{2}{F}_{\mathrm{\&phi;}}\cos (x-\mathrm{\&omega;t})----\left(10\right)$

Obviously after relying on suitable excitation power supply, the first-harmonic composite magnetic power of the composite magnetic power of novel many three phase electric machines and traditional multiphase motor is identical in form, is amplitude to be Angular velocity of rotation is the rotating magnetic potential ripple of ω.

Can prove that the space harmonics composite magnetic power of many three-phase permanent synchronous generators has identical Changing Pattern with the space harmonics composite magnetic power of traditional polyphase machine.Its proof step is as follows, supposes that still the fundamental current of the excitation power supply of some independent three-phases has the mathematic(al) representation of formula (5).

The pulsating magnetic potential amplitude of the v subharmonic of some independence three phase windings is F _v, pulsation is ω, air gap surface certain a bit its coordinate be x, then alternating current in the expression formula of the pulsating magnetic potential of each v space harmonics that produces mutually of the inside of this independent three-phase is:

$f_{\mathrm{vak}}(x,t)=F_{\mathrm{\&phi;v}}\cos \left[v(x-k\frac{\mathrm{\&pi;}}{m})\right]\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m});k=\mathrm{0,1,2},....n-1----\left(11\right)$

$f_{\mathrm{vbk}}(x,t)=F_{\mathrm{\&phi;v}}\cos \left[v(x-k\frac{\mathrm{\&pi;}}{m}-\frac{2\mathrm{\&pi;}}{3})\right]\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m}-\frac{2\mathrm{\&pi;}}{3});----\left(12\right)$

$f_{\mathrm{vck}}(x,t)=F_{\mathrm{\&phi;v}}\cos \left[v(x-k\frac{\mathrm{\&pi;}}{m}+\frac{2\mathrm{\&pi;}}{3})\right]\cos (\mathrm{\&omega;t}-k\frac{\mathrm{\&pi;}}{m}+\frac{2\mathrm{\&pi;}}{3});----\left(13\right)$

Wherein, $F_{\mathrm{\&phi;v}}=\frac{2\sqrt{2}}{\mathrm{\&pi;}}\frac{\mathrm{Iw}}{\mathrm{vp}}{k}_{\mathrm{wv}}$

Then the v subharmonic of many three phase windings always synthesizes the v subharmonic composite magnetic power stack that magnetic potential is each independent three-phase, promptly formula (8), (9), (10) addition, and then the v subharmonic composite magnetic power of each independent three-phase carried out total summation operation, have following expression way:

$f_v(x,t)=\underset{0}{\overset{n-1}{\mathrm{\&Sigma;}}}[f_{\mathrm{vak}}(x,t)+f_{\mathrm{vbk}}(x,t)+f_{\mathrm{vck}}(x,t)]----\left(14\right)$

Can prove from mathematics and also can be expressed as v=2k equally by the harmonic number of formula (14) (n=4 is supposed in 3 * n) ± 1=2km ± 1; M=3 * n=12, then except first-harmonic, the harmonic wave of its minimum number of times is for-23 counter-rotating harmonic waves and just changeing harmonic wave+25 times, and promptly to be lower than 23 times humorous wave amplitude also be zero to harmonic number.

For the delta windings structure, equally also can lead to the same conclusion.

Therefore, the first-harmonic composite magnetic power of the composite magnetic power of novel many three-phase permanent synchronous generators and traditional polyphase synchronous machine is identical in form, and under the effective value excitation of identical phase current, the amplitude that is of its magnetic potential is Angular velocity of rotation is the rotating magnetic potential ripple of ω.Simultaneously, its ability that weakens the high order space harmonics is also identical with traditional poly-phase permanent magnet synchronous motors.Therefore, adopt many three-phase permanent synchronous generators on the basis of the advantage that keeps traditional polyphase machine, have the dispersion mid point, or do not have midpoint configuration, control criterion degree height.

The rectifier power source characteristics of many three-phase permanent synchronous generators

Because the special construction of the winding of many three-phase permanent synchronous generators, its rectifier power source also must move according to certain rules.The number of at first independent three phase excitation power supply must be identical with the number of independent three phase windings, and promptly the number of independent three phase mains also must equal n.Secondly when adopting sinusoidal excitation, the fundamental current expression formula of its independent three-phase should meet formula (5), and phase difference is 120 electrical degrees between the three-phase of independent current source, and the phase difference between the adjacent independent current source is π/(3 * n).The amplitude of its electric current should equate, when adopting the inverter rectification, each independent three phase mains is a three-phase bridge type converter, the phase difference of separate inverter unit inside is 120 °, phase difference between the separate inverter unit is corresponding with the corresponding space angle distribution of the adjacent three-phase of synchronous machine, also is π/m.The topological schematic diagram of its excitation power supply can be referring to Figure of description 3.The per unit value of exciting current and the phase difference of its waveform are referring to Figure of description 4.Adopt with many three-phase permanent synchronous generators are coaxial and be connected with rotary encoder or this motor adopts other transducers that can reflect synchronous motor rotor position and speed to measure the anglec of rotation and the speed of many three-phase permanent synchronous generators rotor in real time, its rotor anglec of rotation is as the control system of synchronizing signal to many three-phase inverters.As external drive power source voltage, electric current synchronizing datum signal.

Description of drawings:

Fig. 1: many three-phase permanent synchronous generators of a plurality of delta windings.The stator of motor is a plurality of delta windings, and motor stator composite magnetic power ripple f (x, rotation electric angle speed t) is ω, the rotor of motor adopts permanent magnet to carry out excitation.

Fig. 2: many three-phase permanent synchronous generators of a plurality of star windings.The stator of motor is a plurality of star windings, and motor stator composite magnetic power ripple f (x, rotation electric angle speed t) is ω, the rotor of motor adopts permanent magnet to carry out excitation.

Fig. 3: the topological schematic diagram of many three-phase permanent synchronous generators rectification excitation power supply.Fig. 3 is 4 * 3 phase motor stator inverter schematic diagrames, and inverter structure and this figure of other n * 3 phases are similar, and its difference is counted difference in the group that is independent three-phase inverter.At first the number of the independent three phase excitation power supply that comprises of inverter must be identical with the number of independent three phase windings of stator, and promptly the number of independent three phase mains also must equal n.Secondly when inverter adopted sinusoidal excitation, the fundamental current expression formula of its each independent three-phase should meet formula (5).Phase difference is 120 ° of electrical degrees between the three-phase of each group independent current source of inverter, phase difference between the adjacent independent current source is π/(3 * n) or identical with the space actual distribution angle of winding, the amplitude of its each phase current should equate, when adopting inverter power supply, each organizes independent three phase mains is a three-phase bridge type converter.Adopt the direct voltage source among the friendship-straight hair electricity mode figure, can think a DC load, normally the DC transmission system that is connected with AC network by inverting.

Fig. 4: the electric current mark oscillogram of many three-phase permanent magnet synchronous motors excitation power supply.What the numerical value of its electric current adopted is per unit value, and at rated point, the amplitude of electric current is 1.

Fig. 5: many three-phase permanent synchronous generators groove electromotive force star graph

Embodiment:

Figure of description 5 is embodiment of many three-phase permanent synchronous generators.Accompanying drawing 5 is in many three-phase systems, has adopted the groove electromotive force star graph of 4 * 3 phase stator winding.From the groove electromotive force star graph as can be seen, 4 groups of three-phase symmetric windings have been comprised in 4 * 3 phase systems, in the present embodiment, the number of stator slots Z=72 of synchronous motor, number of magnetic poles 2p=6, every extremely every phase groove is counted q=1, pole span τ=12, because the generally bigger employing two layer winding of polyphase machine power is commonplace, present embodiment also can adopt single layer winding.Winding pitch can adopt whole apart from winding y=τ, also can adopt the short distance winding $y=\frac{5}{6}\mathrm{\&tau;}=10$ (groove).Space electrical degree between adjacent independence three phase windings is 180 °/(4 * 3)=15 °.The head end of the phase winding of many three-phase permanent synchronous generators is labeled as respectively: A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4; End mark is: X1, X2, X3, X4, Y1, Y2, Y3, Y4, Z1, Z2, Z3, Z4.Similar with the standard threephase motor, the winding of many three-phase permanent synchronous generators can be connected in series, and also can be connected in parallel, and series-parallel rule is identical with the standard threephase motor.Many three-phase permanent synchronous generators can be connected to become 4 star connections, when being connected to star connection, 4 independent mid points are arranged, and can adopt inner connecting way, to reduce external cabling.The as much three-phase permanent synchronous generator can be connected to become 4 delta connections, and do not have mid point this moment, can adopt inner connecting way yet, to reduce external cabling.Obviously, many three-phase permanent synchronous generators since adopt to disperse mid point or do not have in point mode, be better than traditional 12 poly-phase permanent magnet synchronous motors of common mid point mutually aspect the winding reliability.

Claims (4)

1, a kind of magneto alternator of inverter rectification is characterized in that:

A, the stator winding of this motor has many groups three-phase symmetric winding independently on circuit, the mutual coupled relation that magnetic circuit is only arranged between the group of these symmetrical three phase windings and the group, there be not contacting directly on the circuit, adopt three phase windings of Y-connection for each group, all has independent neutral point separately, and these neutral points are isolated mutually on circuit, for three phase windings that each group adopts the triangle connection, these three phase windings are isolated mutually on circuit also is, the total number of phases of many three-phase permanent synchronous generators stator winding has 3 multiple feature, promptly total number of phases of this generator is: 2 * 3 phases, 3 * 3 phases, 4 * 3 phases, 5 * 3 phases, 6 * 3 phases, 7 * 3 phases, 8 * 3 phases ... n * 3 phase (n=2,3,4 ..., n is the positive integer greater than 2);

B, for n independent three phase windings, the displacement electrical degree of its adjacent two three phase windings in the space can adopt 360 ° of displacements/(n * 3), 180 °/(n * 3) or 0≤β＜180 °/(n * 3).

2, many three-phase permanent synchronous generators of inverter power supply according to claim 1, it is characterized in that: this motor is powered by many three-phase inverters, so-called many three-phase inverters are meant that total number of phases of inverter also has 3 multiple feature, promptly total number of phases of this inverter is: 2 * 3 phases, 3 * 3 phases, 4 * 3 phases, 5 * 3 phases, 6 * 3 phases, 7 * 3 phases, 8 * 3 phases ... n * 3 phase (n=2,3,4 ... n is the positive integer greater than 2), and many three-phase permanent synchronous generators equate with total number of phases of many three-phase inverters.

3, many three-phase permanent synchronous generators of inverter power supply according to claim 1 is characterized in that: the structure of many three phase windings of described stator is bilayer or individual layer, short distance or whole distance.

4, many three-phase permanent synchronous generators of inverter power supply according to claim 1 is characterized in that: motor coaxle is connected with rotary encoder or this motor adopts other transducers that can reflect motor p-m rotor position and speed to measure the anglec of rotation and the speed of p-m rotor in real time.

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