CN103887905A - Stator structure of magnetic resistance type rotary transformer - Google Patents

Abstract

The invention provides a stator structure of a magnetic resistance type rotary transformer. A stator is composed of a stator iron core and a winding coil, the stator iron core is formed by overlaying a certain number of stator stamping sheets, the winding coil is wound on the stator stamping sheets and comprises an exciting winding and an output winding, additional grooves are formed in the symmetrical positions of the two sides of the groove wall of a stator groove formed by the stator stamping sheets respectively, separation inserting sheets are placed in the additional grooves, the stator groove is divided into an upper groove layer and a bottom groove layer by the separation inserting sheets, the exciting winding is placed on the upper groove layer, and the output winding is placed on the bottom groove layer. Through the new design of the stator groove type and the winding placement mode, the maximum source, namely, constant components in output potentials, for generating electrical errors of the magnetic resistance type rotary transformer can be eliminated.

Description

The stator structure of magnetoresistance transformer

Technical field

The present invention relates to induction angular position sensor technical field, in particular, relate to a kind of stator structure of magnetoresistance transformer.

Background technology

The former secondary both sides winding (excitation winding and output winding) of tradition resolver be placed on respectively in stator slot and rotor in, the electromagnetic coupled between the two need to realize by air gap.Although traditional resolver has been all very high, the good sensing element of performance in reliability and precision, is widely used in every field.But magnetoresistance transformer has the incomparable higher unfailing performance of any angle sensor element.Therefore,, as electric automobile, high ferro train, motor-car and as electric drive in military hardware, for the cause of reliability, the angle sensor element of selecting, is all magnetoresistance transformer.But, due to the special construction at magnetoresistance transformer, its high accuracy is difficult for obtaining.This is because revolve in change at reluctance type, does not lay winding, is magnetic poles on rotor, and excitation winding and output winding are to be all placed in same set of stator slot.In the time having excitation, in air gap, magnetic field, due to the variation of magnetic resistance, has produced each harmonic magnetic flux.Secondary output winding extracts, utilizes fundametal compoment wherein, eliminates other subharmonic, has so just formed output potential.Following formula illustrates the output potential of two-phase

$\left.\begin{array}{c}{E}_A(\mathrm{\θ},t)=E_{2m}\·\sin \mathrm{\θ}\·\sin \left(\mathrm{\ωt}\right)\\ E_B(\mathrm{\θ},t)=E_{2m}\·\cos \mathrm{\θ}\·\sin \left(\mathrm{\ωt}\right)\end{array}\right\}$

In formula: E _a, E _b-be respectively the output potential of secondary output winding, E _2M-be the amplitude of output potential, θ-rotor rotational angle, the electric frequency of ω-field power supply, t-time.

But due to the problem of structural principle, magnetoresistance transformer has a very large difficult problem, is exactly in secondary output potential, exist one to be very difficult to the stationary component of eliminating.This stationary component is not change with corner, and this just causes electrical error, and is the random regularity that do not have.

Summary of the invention

The present invention is directed to the technical problem existing in above-mentioned prior art, a kind of stator structure of magnetoresistance transformer is provided, lay arrangement mode by the design to stator grooved and winding, eliminate and in the secondary output potential of magnetoresistance transformer, be very difficult to the stationary component eliminated, make in the coupling of slot leakage, can reach between former limit and secondary minimum, and coupling between the two becomes unified and standard.

For achieving the above object, the technical solution adopted in the present invention is as follows:

A kind of stator structure of magnetoresistance transformer, described stator has the stator core being built up by the stator punching of some and is wrapped in the winding coil on stator punching, described winding coil comprises excitation winding and output winding, on the stator slot cell wall being formed by described stator punching, bilateral symmetry position offers respectively additional groove, described additional groove is interior for placing isolation inserted sheet, stator slot is divided into groove upper strata and bottom land layer two parts by described isolation inserted sheet, place described excitation winding on described groove upper strata, place described output winding at described bottom land layer.

The ratio of the area of described groove upper strata and bottom land layer is 1.15:1.

The grooved size of described stator slot meets following formula:

$\frac{h_{s1}}{h_s}=\frac{(k+1)b_{s1}-\sqrt{(k+1)(k_{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="HDA0000484220670000012.png,HDA0000484220670000013.png"\; state="\{\{state\}\}">s</figure-callout>}1}^2{\mathrm{<figure-callout\; id="1"\; label="b\; s"\; filenames="HDA0000484220670000012.png,HDA0000484220670000013.png"\; state="\{\{state\}\}">b</figure-callout>}}_s^1+b_{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000484220670000012.png,HDA0000484220670000013.png"\; state="\{\{state\}\}">s</figure-callout>}2}^2)}}{(k+1)(b_{s1}-b_{s2})}---\left(1\right)$

h _s2＝h _s-h _s1

Wherein: ratio, the b of k-groove upper strata area and groove ground floor area _s1-bottom land layer is wide, b _s2-groove upper strata is wide, h _s-stator slot is high, h _s1-bottom land floor height, h _s2floor height on-groove.

Described groove upper strata and bottom land layer are provided with independently slot liner.

Technical solution of the present invention, the technique effect that can reach is as follows:

1, the planning of excitation phase winding shape is unified;

2, between former secondary winding, the electromagnetic coupled in groove reduces also regular strong;

3, the stationary component of secondary winding output potential reduces to minimum, and it is minimum that electrical error also reduces to.

Brief description of the drawings

By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:

Fig. 1 is traditional magnetoresistance transformer rotor punching schematic diagram;

Fig. 2 (a) is that traditional reluctance type revolves and becomes the slot leakage signal that distributes;

Fig. 2 (b) is that traditional reluctance type revolves and becomes slot leakage two signals that distribute

Fig. 3 is stator slot excitation stray flux distribution signal provided by the present invention;

Fig. 4 is stator punching provided by the present invention and grooved;

Fig. 5 is the signal of the each dimension elements of stator slot provided by the present invention;

Fig. 6 is each arrangements of elements figure in stator slot provided by the present invention.

Embodiment

For making object, the technical method of case study on implementation of the present invention more clear, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is known to complete description.

Fig. 1 is traditional magnetoresistance transformer rotor punching schematic diagram.Fig. 2 (a) and Fig. 2 (b) they are that traditional reluctance type revolves change slot leakage distribution signal, in figure, and excitation winding 1, A phase winding 2, B phase winding 3, the magnetic line of force 9.The rotor shapes of magnetoresistance transformer is in when design, except considering to form necessary number of poles, also must consider to make in air-gap field fundametal compoment large as much as possible.And secondary output winding also must do particular design, adopt the positive chorded winding of three types (a kind of winding configuration that can eliminate all subharmonic except slot ripples and first-harmonic), in the electromotive force that makes it to export, only retain the fundametal compoment that becomes sine and cosine relation with corner, other components (stationary component and higher harmonic components) are all eliminated or weaken greatly.The distribution of air-gap permeance can formula (2) represent:

$\mathrm{\&lambda;}\left(\mathrm{\&theta;}\right)={\mathrm{\&lambda;}}_0+\underset{i=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{\mathrm{\&lambda;}}_{\mathrm{mi}}\cos \left(\mathrm{i\&theta;}\right)---\left(2\right)$

In formula: λ ₀stationary component in-magnetic conductance, λ _iharmonic component amplitude in-magnetic conductance,

θ-angle of rotor

In positive chorded winding, each element number of turn distributes by formula (3):

$N_i=\frac{4W_{\mathrm{ef}}}{4}\cos P[(i-1)\frac{2\mathrm{\&pi;}}{Z}+\frac{\mathrm{\&pi;}}{4P}]---\left(3\right)$

In formula: W _ef-winding effective turn, P-number of pole-pairs, Z-groove number

Corresponding air gap flux density is: $B\left(\mathrm{\&theta;}\right)=B_0+\underset{i=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{B}_{\mathrm{mi}}\cos \left(\mathrm{i\&theta;}\right)---\left(4\right)$

In formula: B ₀the stationary component magnetic resistance intensity not changing with corner in-air gap, B _mieach the close harmonic component amplitude of magnetic resistance intensity magnetic changing with corner in-air gap.

But in magnetoresistance transformer, because former secondary winding is to be placed in same set of stator slot, thereby secondary winding except can chain around by the magnetic flux induced potential of air gap, can also be induced into the electromotive force that former limit winding in slot part and end, produces by the leakage flux of air gap.Due to each element of winding position relationship each other, cannot be unified and standard in each groove, thereby the output of secondary winding also cannot regularly be inducted.Fig. 2 has represented the stochastic relation between each element in different slots.Under the constant magnetic field of common specification, the electromotive force summation E that in output winding, each element is inducted ₀should be zero, shown in (5)

$E_0=k_{\mathrm{\&phi;}}{B}_0\underset{i=1}{\overset{Z}{\mathrm{\&Sigma;}}}\frac{4W_{\mathrm{ef}}}{Z}\cos P[(i-1)\frac{2\mathrm{\&pi;}}{Z}+\frac{\mathrm{\&pi;}}{4P}]=0---\left(5\right)$

In formula:

for magnetic is close and magnetic flux between a conversion coefficient.

Shown in Fig. 2, when the position of the each element of former secondary winding in groove is while being random, lack of standardization, due to each element chain around magnetic flux be no longer just consistent, thereby the electromotive force summation of secondary winding output can not use formula (5) expression.Formula (6) represent to distribute between winding in the different slots situation of induced potential when irregular:

$E_0=\frac{4W_{\mathrm{ef}}}{Z}[{\mathrm{\&Phi;}}_{01}\cos \left(P\frac{\mathrm{\&pi;}}{4P}\right)+{\mathrm{\&Phi;}}_{02}\cos [P(\frac{2\mathrm{\&pi;}}{Z}+\frac{\mathrm{\&pi;}}{4P})]+...+{\mathrm{\&Phi;}}_{0Z}\cos [P(Z-1)\frac{2\mathrm{\&pi;}}{Z}+\frac{\mathrm{\&pi;}}{4}\left]\right]---\left(6\right)$

Here, Φ ₀₁to Φ _0Zit is the leakage flux that in each groove, the each element of excitation winding is coupled to the secondary output element of each correspondence.Like this, after the stationary component that the each element of secondary is inducted by slot leakage flux is added, summation E ₀can not be zero.The fundametal compoment of output potential, after adding this stationary component, will produce electrical error.Output potential can formula (7) represent:

$\left.\begin{array}{c}{E}_A(\mathrm{\&theta;},t)=(E_{0A}+E_{2m}\&CenterDot;\sin \mathrm{\&theta;})\&CenterDot;\sin \left(\mathrm{\&omega;t}\right)\\ E_B(\mathrm{\&theta;},t)=(E_{0B}+E_{2m}\&CenterDot;\cos \mathrm{\&theta;})\&CenterDot;\sin \left(\mathrm{\&omega;t}\right)\end{array}\right\}---\left(7\right)$

In formula: E _0A, E _0Bbe respectively the stationary component not changing with corner in two-phase output winding.

Fig. 2 has represented that in the nonstandard groove corresponding to formula (7), the each element conductor of winding distributes and leakage field, E _0A, E _0Bbe the definite value that an amplitude does not change with corner, this is the inevitable outcome of common winding configuration and common grooved.Can find out, the in the situation that of Fig. 2, secondary output winding around each element chain around leakage flux can not be consistent, be certain to have the output potential of stationary component, produce electrical error.It can also be seen that, arrange because former secondary can not divide position effectively, no matter use which kind of mode rule (machine coiling or artificial hand around), all cannot make winding unified and standard.And then leakage flux is just can not energy chain consistent around situation.

Fig. 3 is stator slot excitation stray flux distribution signal provided by the present invention.Be put in not identical two-layerly because former secondary winding divides, the chain of former secondary can be accomplished unified and standard around situation.

Fig. 4 is stator punching provided by the present invention and grooved schematic diagram, and groove two walls respectively arrange the additional groove 7 of a mounting groove layer isolation inserted sheet 5 in symmetric position, stator slot are divided into two-layer up and down---groove upper strata and bottom land layer, two-layer area is taken as and equates.But because laying excitation winding 1 in groove upper strata, excitation winding 1 resistance should be as much as possible little, so groove upper strata area suitably strengthens, the ratio of the area of groove upper strata and bottom land layer can be taken as 1.15:1.According to the regulation of groove area ratio, grooved about the design formula of size as follows:

$\frac{h_{s1}}{h_s}=\frac{(k+1)b_{s1}-\sqrt{(k+1)(k_{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="HDA0000484220670000012.png,HDA0000484220670000013.png"\; state="\{\{state\}\}">s</figure-callout>}1}^2{\mathrm{<figure-callout\; id="1"\; label="b\; s"\; filenames="HDA0000484220670000012.png,HDA0000484220670000013.png"\; state="\{\{state\}\}">b</figure-callout>}}_s^1+b_{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000484220670000012.png,HDA0000484220670000013.png"\; state="\{\{state\}\}">s</figure-callout>}2}^2)}}{(k+1)(b_{s1}-b_{s2})}---\left(1\right)$

h _s2＝h _s-h _s1

In formula, each parameter is shown in that Fig. 5 indicates, wherein: ratio, the b of k-groove upper strata area and groove ground floor area _s1-bottom land layer is wide, b _s2-groove upper strata is wide, h _s-stator slot is high, h _s1-bottom land floor height, h _s2floor height on-groove.

Winding is laid as shown in Figure 6: in by two grooves up and down of being divided into of isolation inserted sheet 5, bottom land layer is laid A and exported mutually winding 2 and export mutually winding 3 with B, and excitation winding 1 is laid on groove upper strata.The regulation that this winding layering is laid, makes in the coupling of slot leakage, can reach minimum between former limit and secondary.And can reach standardization, make the randomness when not stratified reduce to minimum.

Groove layer isolation inserted sheet 5 is divided into stator slot two-layer up and down effectively, makes to export winding and excitation winding no longer mixes, and the coupling between the two becomes unified and standard.

Answer in contrast, respectively there is the slot liner 4,6 of oneself on bottom land layer and groove upper strata.Not only insulation property are greatly improved, and make winding become the unified and standard compactness of shape more, are conducive to further improve performance.

Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (4)

1. the stator structure of a magnetoresistance transformer, described stator has the stator core being built up by the stator punching of some and is wrapped in the winding coil on stator punching, described winding coil comprises excitation winding and output winding, it is characterized in that, on the cell wall of the stator slot being formed by described stator punching, bilateral symmetry position offers respectively additional groove, described additional groove is interior for placing isolation inserted sheet, stator slot is divided into groove upper strata and bottom land layer two parts by described isolation inserted sheet, place described excitation winding on described groove upper strata, place described output winding at described bottom land layer.

2. the stator structure of magnetoresistance transformer according to claim 1, is characterized in that, the ratio of the area of described groove upper strata and bottom land layer is 1.15:1.

3. the stator structure of magnetoresistance transformer according to claim 1, is characterized in that, the grooved size of described stator slot meets following formula:

$\frac{h_{s1}}{h_s}=\frac{(k+1)b_{s1}-\sqrt{(k+1)(k_{s1}^2{b}_{s1}^2+b_{s2}^2)}}{(k+1)(b_{s1}-b_{s2})}$

h _s2＝h _s-h _s1

Wherein: ratio, the b of k-groove upper strata area and groove ground floor area _s1-bottom land layer is wide, b _s2-groove upper strata is wide, h _s-stator slot is high, h _s1-bottom land floor height, h _s2floor height on-groove.

4. the stator structure of magnetoresistance transformer according to claim 1, is characterized in that, described groove upper strata and bottom land layer are provided with independently slot liner.

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