CN104488047B - Three-phase/two-phase rotary transformer - Google Patents

Abstract

The present invention relates to three-phase/two-phase rotary transformer.A kind of three-phase/two-phase rotary transformer (10), it includes that three-phase part (11) and two-phase part (12), described three-phase part and described two-phase part can be around axis A relative to each other rotary motions；Described three-phase part (11) includes by ferromagnetic material and three-phase coil (24,25,26,27) the first body made, described two-phase part (12) includes by ferromagnetic material and two-phase coil (28,29,30,31) the second body made；Described second body defines first annular groove (34) of axis A and second annular groove (35) of axis A, described two-phase coil includes the first annular coil (29) of the axis A in described first annular groove (34), second loop coil (28) of the axis A in described first annular groove (34), fourth annular coil (31) with the axis A in the 3rd loop coil (30) of the axis A in described second annular groove (35) and described second annular groove (35), described first annular coil (29) and described second loop coil (31) series connection, and described second loop coil (28) and described 3rd loop coil (30) series connection.

Description

Three-phase/two-phase rotary transformer

Technical field

The present invention relates to the general domain of transformator.Especially, the present invention relates to three-phase/two-phase transformer.

Background technology

In particular case, it is necessary in a balanced fashion electric energy is sent to two-phase power supply from three phase mains.Exist Three-phase/two-phase static transformer, is particularly known as Scott and connects a kind of static transformer of circuit and be known as Le Bulang Gram connect circuit another kind of static transformer.But, there is not three-phase/two-phase rotary transformer.

In order to implement this function, a solution is based on using three-phase/two-phase static transformer and two single-phase rotations Change depressor.Another solution is based on three the single-phase rotary transformers using application Le Bulangke to connect.

But, these solutions are required to bigger weight and bigger volume.And, in the first solution In, the problem that there is remanent magnetization and current surge when on.

Also needing to the solution of a kind of improvement, it makes it possible to be sent to from three phase mains by electric energy in a balanced fashion Two-phase power supply.

Summary of the invention

The present invention proposes a kind of three-phase/two-phase rotary transformer, and it includes three-phase part and two-phase part, described three-phase Part and described two-phase part can be relative to each other around axis A rotary motions.

Three-phase part includes the first body being made up of ferromagnetic material and three-phase coil, and two-phase part includes by ferromagnetic material The second body made with two-phase coil；

Second body defines first annular groove of axis A and second annular groove of axis A, the first annular groove by the first side leg, Center leg and ring part limit, and the second annular groove is limited by center leg, the second side leg and ring part；And

Axis A's in the first annular coil of axis A that two-phase coil includes being positioned in the first annular groove, the first annular groove The fourth annular line of the axis A in the 3rd loop coil of the axis A in the second loop coil and the second annular groove and the second annular groove Circle, first coil and the second coils connected in series, and the second coil and tertiary coil series connection.

Wherein, the electric current in the coiling direction of given coil and closure, first coil and the 4th coil is with regard to First Line For the 4th coil, correspond to second magnetic potential contrary with described first magnetic potential corresponding to the first magnetic potential for circle, and Electric current in second coil and tertiary coil corresponds to for tertiary coil corresponding to the 3rd magnetic potential for the second coil Fourth magnetic potential contrary with described second magnetic potential.

Therefore, in same three-phase/two-phase rotary transformer, implement the three-phase between two referentials/two-phase conversion and pass Defeated, one of them referential rotates relative to another referential.This transformator has limited weight and volume.

Advantageously, first coil and tertiary coil each be respectively provided with n_aCircle, the second coil and the 4th coil each be respectively provided with n_b Circle, wherein

In this case, transformator can implement the three-phase/two-phase transformer transmission of balance.

In one embodiment, three-phase part is around axis A around two-phase part, or on the contrary.This is corresponding to making title Make the transformator of " U-shaped ".

Three-phase part and two-phase part can be positioned at side juxtaposition along axis A direction.This is corresponding to making referred to as " E shape " Or the transformator of " can-like ".

In one embodiment, the first and second bodies being made up of ferromagnetic material are entirely around three-phase and two-phase coil.? In this case, transformator is magnetic shield type.

In one embodiment, the first body defines the 3rd annular groove and the 4th annular groove of axis A of axis A, by the 3rd side Supporting leg, the second center leg and the second ring part limit described 3rd annular groove, by the second center leg, the 4th side leg and second Ring part limits described 4th annular groove.

The axis A's that three-phase coil includes being positioned in the 5th loop coil of the axis A in the 3rd annular groove, the 3rd annular groove 8th toroid of the axis A in the 7th loop coil of the axis A in the 6th loop coil, the 4th annular groove and the 4th annular groove Circle, the 6th coil and the 7th coils connected in series.

In this case, three-phase part has the topological structure of the volume and weight contributing to limiting transformer.And And, it is possible to simply use loop coil and make transformator and therefore need not the coil with increasingly complex shape.

In one embodiment, two-phase part also includes least one set three-phase coil.In a known way, transformator can have There is multiple Secondary Winding.In this illustration, the two-phase Secondary Winding of balance and at least one three-phase Secondary Winding is used to make The transmission of balance can be implemented for any number of power supply.

Accompanying drawing explanation

From following description, further feature and the advantage of the present invention will become clear from referring to the drawings, and described accompanying drawing illustrates Not there is the embodiment of limited features part.In the drawing:

Fig. 1 is the magnetic shield three-phase/two-phase rotary transformer of the magnetic flux forcing to link in the first embodiment of the present invention Sectional view；

Fig. 2 is the decomposition diagram of the magnetic circuit of Fig. 1 transformator；

Fig. 3 A to Fig. 3 E shows the circuit diagram of multiple flexible programs of the coil for connecting Fig. 1 transformator；

Fig. 4 A to Fig. 4 C shows in the relevant details for the Fig. 1 in the different location flexible program of coil；

Fig. 5 is that the magnetic shield three-phase/two-phase of the magnetic flux that having in the second embodiment of the present invention forces to link rotates The sectional view of transformator；With

Fig. 6 is the decomposition diagram of the magnetic circuit of Fig. 5 transformator.

Detailed description of the invention

Fig. 1 is the sectional view of the rotary transformer 1 in the first embodiment of the present invention.Transformator 10 is to have pressure to link The three-phase/two-phase rotary transformer of magnetic shield of magnetic flux.

Transformator 10 includes that three-phase part 11 and two-phase part 12, described three-phase part 11 and described two-phase part 12 are suitable to Relative to each other rotate around axis A.Illustrating, three-phase part 11 is stator and two-phase part 12 is rotor, otherwise or. In flexible program, three-phase part 11 and two-phase part 12 are relative to stationary reference frame (not shown) rotatable movement.

Ring part 13 that two-phase part 12 includes axis A and three supporting legs 14,15 and 16 being made up of ferromagnetic material.? In lower limb 14,15 and 16 each all starts to radially extend away from axis A from ring part 13.Supporting leg 14 is positioned at the one of ring part 13 Individual end, supporting leg 16 is positioned at another end of ring part 13, and supporting leg 15 is between supporting leg 14 and 16.Ring part 13 He Supporting leg 14 and 15 defines annular groove 34, described annular groove 34 opening in radially outward direction.Ring part 13 and supporting leg 15 with And 16 annular grooves 35 defining opening in radially outer direction.It is said that in general, ring part 13 and supporting leg 14,15 and 16 are formed Define the body of ferromagnetic material of two annular grooves 34 and 35, described annular groove 34 and 35 opening in radially outward direction.

Ring part 17 that three-phase part 11 includes axis A and three supporting legs 18,19 and 20 being made up of ferromagnetic material.Annular Portion 17 is around ring part 13.In supporting leg 18,19 and 20 each all originates in ring part 17 and is radially orientated axis A extension.? Lower limb 18 is positioned at an end of ring part 17, and supporting leg 20 is positioned at another end of ring part 17, and supporting leg 19 is positioned at supporting leg Between 18 and 20.Ring part 17 and supporting leg 18 and 19 define the annular groove 17 of opening in radially inward direction.Ring part 17 With the annular groove 23 that supporting leg 19 and 20 defines opening in radially inward direction.It is said that in general, ring part 17 and supporting leg 18,19 And 20 define body of ferromagnetic material, described body of ferromagnetic material defines two annular grooves 22 and 23, described annular groove 22 and 23 along Radial inwardly direction opening.

Supporting leg 14 and 18,15 and 19 and 16 and 20 is facing with each other, in order to limits air gap 21, is consequently formed transformator 10 Post.

Ring part 13 and 17 defines the magnetic circuit of transformator 10 together with supporting leg 14 to 16 and 18 to 20.Therefore transformator 10 is Three pillar type transformator.More definitely, to have the first post (corresponding to supporting leg 14 and 18), the second post (right for the magnetic circuit of transformator 10 Should be in supporting leg 15 and 19) and the 3rd post (corresponding to supporting leg 16 and 20).Fig. 2 shows the exploded perspective of the magnetic circuit of transformator 10 Figure.

Referring again to Fig. 1, three-phase part 11 includes coil 24,25,26 and 27, two-phase part 12 include coil 28,29, 30 and 31.Hereinafter, symbol is used with reference to such structurepWiths, in described structure, coil 24 and 27 is transformator 10 Primary winding, coil 28 to 31 is the secondary coil of transformator 10.And, once can be relative to the example described with secondary Naturally reverse.

Coil 24 is the loop coil of phase Up corresponding to transformator 10 of axis A.It is positioned in groove 22.Coil 25 is axle The loop coil being positioned in groove 22 of line A.Coil 26 is the loop coil being positioned in groove 23 of axis A and goes here and there with coil 25 Connection.Coil 25 and 26 is corresponding to phase Vp of transformator 10.Finally, coil 27 is phase Wp corresponding to transformator 10 of axis A Loop coil.Described coil 27 is positioned in groove 23.Each of which in coil 24 to 27 has n₁Circle.

Term " loop coil of axis A " has the coil of winding circle on the axis a for representing.Here, term " ring Shape " it is not intended as representing the entity pivoted and produce by making coil enclose in a restricted way.In contrast, as shown In the example gone out, especially, toroidal cross section can be rectangle.

Coil 28 is the loop coil of axis A and is positioned in groove 34.Coil 29 is the loop coil of axis A and is positioned at groove 34 In.Coil 30 is the loop coil of axis A and is positioned in groove 35.Finally, coil 31 is the loop coil of axis A and is positioned at groove 35 In.Coil 28 and coil 30 are connected and correspond to phase V of two-phase part 12₁.Connect with corresponded manner, coil 29 and coil 31 And phase V corresponding to two-phase part 12₂。

Coil 24,25,28 and 29 is around the magnetic core 32 being positioned in ring part 13.Term " magnetic core " is for representing in magnetic circuit Such part, in the part., coil the magnetic flux in the same direction produced is in the great majority.The electric current of flowing in coil 24 and 25 Therefore correspond to the magnetic potential in magnetic core 32.With corresponded manner, coil 26,27,30 and 31 is around the magnetic core being positioned in ring part 13 33.Electric current in coil 26 and 27 therefore corresponds to the magnetic potential in magnetic core 33.

With reference to Fig. 3 A, how transformator 10 explained below operates.Below and in figure 3, following symbol is used.

A_p、B_pAnd C_pIt it is the inlet point of the three-phase coil of transformator 10.Phase U in Fig. 1, V and W correspond respectively to Fig. 3 A's Phase A, B and C, but all other type of correspondences are all feasible.

·I_ap、I_bp, and I_cpIt is an A_p、B_pAnd C_pPlace enters electric current accordingly.

·V_apIt is the voltage of phase A of three-phase part 11.

·O_ap、O_bp, and O_cpBe so that possible galvanic couple and be equal to all kinds static three-phase transformer (star-star, Star-delta, triangle-triangle, triangle-star, zigzag etc.) junction point.

Stain shows the relation between the direction of the electric current in coil and corresponding magnetic potential；As fruit dot is positioned on the left of coil On, then coil is wound around along such direction: it makes the magnetic potential produced and enters sense of current identical (clockwise winding). As fruit dot is positioned on the right side of coil, then winding direction causes and produces magnetic potential along the direction contrary with entering sense of current (anticlockwise winding).

Pa ,-Pb, Pb and Pc are that magnetic core 32 and 33 corresponds respectively to electric current I_ap、I_bp, and I_cpMagnetic potential；

n_aIt it is the number of turn of coil 29 and 30；

n_bIt it is the number of turn of coil 28 and 31；

n_t=n_a+n_bFor each phase V₁And V₂Total number of turns；

I_s1、I_s2It it is phase V of two-phase part 12₁And V₂In phase induced current；

V_s1、V_s2It it is phase V of two-phase part 12₁And V₂Relevant voltage.

The winding direction of the given coil 25 and 26 illustrated in figure 3 a and series system, the electric current I in magnetic core 32_bpCorresponding Magnetic potential-Pb on the direction in opposite direction with magnetic potential Pa, and in magnetic core 33, electric current I_bpCorresponding in opposite direction with magnetic potential Pc Direction on magnetic potential Pb.

Fig. 3 B to Fig. 3 E is the sketch similar with Fig. 3 A, wherein, illustrate only winding of three-phase, and they illustrate Make it possible to obtain the modification series connection of same effect and winding direction.

Therefore, transformator 10 make it possible to each magnetic core 32 with 33 on produce modulus (modulus) but identical direction Contrary magnetic potential Pa, Pb and Pc and described magnetic potential Pa, Pb and Pc are symmetrical relative to the axis of symmetry B between two magnetic cores.

The magnetic coupling implemented by the magnetic circuit with winding topology structure of Fig. 3 A to Fig. 3 E makes it possible to have relative to list Phase transformer is as at the 3/2 identical coefficient of coup with the magnetic flux produced on the static three-phase transformer forcing magnetic flux.In order to Having the optimal coefficient of coup, the magnetic resistance of each (mainly producing because of air gap) in column magnetic separator (magnetic column) must Must be equal.Specifically, as, in there is the static three-phase transformer forcing magnetic flux, each in column magnetic separator produced phase Deng magnetic resistance, described magnetic resistance is higher than the magnetic resistance of magnetic material.In rotary transformer, this passes through the easy to do realization of air gap.

Can balancing at inductance and resistance mutually of the three-phase part 11 of transformator 10.

Specifically, by 2*n altogether₁In any case the inductance of the phase that the coil 25 and 26 of circle is formed is equal to have n₁Circle The inductance of other phase, this is because the geometry of magnetic circuit is for offsetting the half magnetic flux in each half coil.More accurate Ground, the number of turn of coil 25 is identical with the number of turn of coil 24 and has identical magnetic circuit, and above content is equally applicable to line Circle 26 and 27.But, coil 24 and 27 is symmetrical and has the identical number of turn, and therefore their inductance is equal.Coil 25 along with The direction that coil 26 is contrary winds and therefore due to its half magnetic flux of parallel connection of central authorities' column magnetic separator (being formed by supporting leg 15 and 19) It is cancelled, and same content is also applied for coil 26.Therefore the total inductance of coil 25 and 26 is equal to total electricity of coil 24 and 27 Sense.

Balancing resistance can be carried out by selecting the cross section of the conductor of coil by rights.There is n₁Phase U of circle and W's Cross section is equal, and has 2*n₁The cross section of phase V of circle is the twice in aforementioned cross section.Specifically, in order to keep the electricity of balance in mutually Resistance, the phase of a length of twice also must have the area of section of twice, with in order to make up its longest length.

On two-phase side, in order to ensure suitably linking magnetic flux, be distributed in each in magnetic core 32 and 33 is given The ampere-turn of each (magnetic potential) in two coils in mutually must have contrary direction.The sense of current and winding direction Some structures make it possible to meet this condition.ForRatio for, voltage in two-phase part 12 tool There is identical value and they are orthogonal.Each phase V₁And V₂It is respectively provided with identical coil turn n_t, and therefore relative to magnetic circuit pair Claim.The resistance of the most each phase and self-induction and mutual inductance are balances.Equally, by geometry, also balance leakage inductance.

In other words, ratioMake it possible in a balanced fashion by electric energy and/or signal from three phase mains It is transferred to two-phase power supply.

If observing the above-mentioned condition about ampere-turn direction, then the structure of transformator 10 will not be to the electricity of two-phase side 90 degree of phase contrasts (phase place offsets from each other ± pi/2) between pressure and electric current produce impact, but only for three-phase part 11 With the phase contrast between two-phase part 12 produces impact.

Current ratio is given by below equation:

$\frac{I_{ap}}{I_{s1}}=\frac{\sqrt{2}}{3}\frac{n_a+n_b}{n_1}$

Voltage ratio is given by below equation

$\frac{V_{1s}}{V_{ap}}=\frac{1}{\sqrt{2}}\frac{n_a+n_b}{n_1}$

Transformator 10 thus be accordingly used in a balanced fashion between the three phase mains relative to each other rotated and two-phase power supply Transmission electric energy and/or signal, and need not include the circuit of multiple stator and rotor transformer simultaneously.

Transformator 10 also has other advantage.Especially, it can be seen that magnetic circuit is entirely around coil 24 to 31.Transformator 10 Therefore by magnetic shield.And, coil 24 to 31 is entirely the loop coil of axis A.Therefore transformator 10 need not complicated shape Coil.Finally, the weight of transformator 10 is alleviated volume-diminished.

The position of the coil 24 to 31 shown in Fig. 1 constitutes an example, and other position is also feasible.Fig. 4 A to Fig. 4 C Showing the corresponding different feasible programs of set winding 24 to 31, described Fig. 4 A to Fig. 4 C is corresponding to details IV in Fig. 1.

In Figure 4 A, in groove 22 or 23, three-phase coil is the most adjacent one another are and they are along on the contrary Direction be wound around.Two-phase coil is the most adjacent one another are and they are wound around along contrary direction.

In figure 4b, in groove 22 or 23, three-phase coil is mutually wound around around axis A, and they are along contrary Direction is wound around.Two-phase coil is wrapped around one another relative to axis A, and they are wound around along same direction.

In figure 4 c, in groove 22 or 23, three-phase coil is the most adjacent one another are, and they are along same Direction is wound around.Two-phase coil is the most adjacent one another are, and they are wound around along same direction.

Coil in unshowned flexible program, in mixing channel 22 or 23.

And, the location of the three-phase coil in any one in Fig. 4 A to Fig. 4 C can each with Fig. 4 A to Fig. 4 C The bit combination of the two-phase coil in Zhang.

Fig. 5 shows the transformator 110 in the second embodiment that we are bright.Transformator 110 may be considered the " U of Fig. 1 Shape " " E shape " or " can-like " flexible program of transformator.Therefore, use the reference identical with Fig. 1 in Figure 5, and do not deposit At confusion risk, and the detailed description of transformator 110 will be omitted.If the decomposition at the magnetic circuit as transformator 110 is saturating View seen in fig. 6, will only describe, reference 13 and 17 corresponding to two axially spaced ring parts, Lower limb 14 to 16 and 18 to 20 magnetic core in axially extending and this example between two ring parts 13 and 17 is positioned at column magnetic separator In.

In mode known in field transformer, transformator can have multiple Secondary Winding.Therefore, in unshowned reality Executing in example, transformator includes: the three-phase part at a winding；Part at Secondary Winding, described part has and transformator The magnetic structure that the part 12 of 10 is identical；Least one set three-phase coil (such as, is connected based on the principle identical with coil 24 to 27)； With such as one group of two-phase coil of transformator 10.The three-phase coil of Secondary Winding and two-phase coil are in identical groove 34 and 35.

This makes it possible to supply any number of load from three phase mains in a balanced fashion.Such as, in order to supply 11 Individual load, it is possible to use three three-phase Secondary Winding and a two-phase Secondary Winding (11=3*3+2).

As explained above, the topological structure of three-phase part 11 makes it possible to replicate and has the magnetic flux forcing link The magnetic flux of three post static transformers.Therefore, in flexible program, the topological structure of the three-phase part of transformator is opened up with shown Though it is different to flutter structure, but still is able to replicate identical magnetic flux.

Claims (7)

1. three-phase/two-phase rotary transformer (10,110), it includes three-phase part (11) and two-phase part (12), described three Part and described two-phase part can be around axis A relative to each other rotary motions mutually；

Described three-phase part (11) includes the first body being made up of ferromagnetic material and three-phase coil (24,25,26,27), described double Part (12) includes the second body being made up of ferromagnetic material and two-phase coil (28,29,30,31) mutually；

Described second body defines first annular groove (34) of axis A and second annular groove (35) of axis A, described first annular groove (34) Being limited by the first side leg (14), center leg (15) and ring part (13), described second annular groove (35) is by described center leg (15), the second side leg (16) and described ring part (13) limit；And

Described two-phase coil includes the first annular coil (29) of the axis A in described first annular groove (34), described first annular groove (34) the 3rd loop coil (30) of the axis A in second loop coil (28) of the axis A in, described second annular groove (35) and The fourth annular coil (31) of the axis A in described second annular groove (35), described first annular coil (29) and described second ring Shape coil (31) is connected, and described second loop coil (28) and described 3rd loop coil (30) are connected；

Wherein, the coiling direction of given described three-phase coil and closure, the most described first annular coil (29) and described the Electric current in four loop coils (31) corresponds to the first magnetic potential for described first annular coil (29), and with regard to described Fourth Ring Corresponding to second magnetic potential contrary with described first magnetic potential for shape coil (31), and described second loop coil (28) and institute State the electric current in the 3rd loop coil (30) for described second loop coil (28) corresponding to the 3rd magnetic potential with regard to described the Corresponding to fourth magnetic potential contrary with described second magnetic potential for three loop coils (30).

Transformator the most according to claim 1, wherein, described first annular coil (29) and described 3rd loop coil (30) each is respectively provided with n_aCircle, and described second loop coil (28) and described fourth annular coil (31) each be respectively provided with n_b Circle, wherein,

3. according to the transformator (10) described in claims 1 or 2, wherein, described three-phase part (11) around described axis A around Described two-phase part (12), or on the contrary.

4. according to the transformator (110) described in claim 1 or claim 2, wherein, described three-phase part (11) and described Two-phase part (12) is positioned at side juxtaposition along the direction of described axis A.

Transformator the most according to claim 1 (10,110), wherein, described first body be made up of ferromagnetic material and described Second body is entirely around described three-phase coil and described two-phase coil.

Transformator the most according to claim 1 (10,110), wherein, described first body defines the 3rd annular groove of axis A (22) and the 4th annular groove (23) of axis A, described 3rd annular groove (22) by the 3rd side leg (18), the second center leg (19) and Second ring part (17) limits, and described 4th annular groove (23) is by described second center leg (19), the 4th side leg (20) and institute State the second ring part (17) to limit；

Described three-phase coil includes the 5th loop coil (24) of axis A in described 3rd annular groove (22), described 3rd annular groove (22) the 7th loop coil (26) of the axis A in the 6th loop coil (25) of the axis A in, described 4th annular groove (23) and 8th loop coil (27) of the axis A in described 4th annular groove (23), described 6th coil (25) and described 7th coil (26) series connection.

Transformator the most according to claim 1, wherein, described two-phase part also includes least one set three-phase coil.