CN100435248C - Magnetoresistance brushless multi-polar rotation transformer - Google Patents

Abstract

The present invention relates to a magnetoresistance type brushless multi-polar rotary transformer which solves the problems that the existing rotary transformer used for angle measurement has complicated structure and is not suitable for multi-polar angle measurement with less polar pairs. P wave crests and P wave troughs are uniformly set on the outer circular surface of a rotor (2) of the present invention, and the wave crests and the wave troughs are mutually connected in a smooth mode to form a wave-shaped outer circular surface of the rotor (2). An exciting winding (4), a sine winding (5) and a cosine winding (6) use a layout of front and back interphase connection in series. When a constant-voltage alternating current passes through the exciting winding of the present invention, the sine winding (5) and the cosine winding (6) respectively output voltages of which the electromotive force amplitudes can make P sine variations and P cosine variations following the rotary angle of the rotor. The present invention has the advantages of simple structure and convenient fabrication, and is particularly suitable for a rotor position sensor of a brushless DC motor.

Description

Magnetoresistance brushless multi-polar rotation transformer

Technical field

The present invention relates to a kind of magnetoresistance brushless multi-polar rotation transformer.

Background technology

The traditional resolver that is used for angle measurement, its input and output winding places respectively on rotor and the stator, for realizing non-brushing, need add a coupling transformer, makes structure complicated; And another kind of cursor type resolver, two kinds of windings all on stator, have been realized non-brushing, but the number of pole-pairs P of this resolver a lot (for example P is more than 32), and to adopt baroque positive chorded winding.This two classes resolver when being used for the brushless DC motor rotor-position sensor, is not desirable element particularly when being used for the less multipole angular surveying of number of pole-pairs.

Summary of the invention

In order to solve the existing problem that is used for the rotating transformer structures complexity of angle measurement and is not suitable for the less multipole angular surveying of number of pole-pairs, the invention provides a kind of magnetoresistance brushless multi-polar rotation transformer based on magnetic resistance principle and coil compensation principle, it is used for angular surveying or angle sensor.

Resolver comprises rotor 2 and stator 1, is provided with air gap 3 between the internal circular surfaces of the outer round surface of described rotor 2 and stator 1; Described resolver also comprises the first coil 4-1, the second coil 5-1 and tertiary coil 6-1; The outer round surface of described rotor 2 evenly is provided with P crest and P trough, and the mutual slyness of described crest and trough connects and composes the waveform outer round surface of rotor 2, and wherein, P is the number of pole-pairs of this resolver; The internal circular surfaces of described stator 1 has a plurality of groove 1-2 vertically, between described adjacent two groove 1-2 double wedge 1-1 is arranged, the internal circular surfaces of described stator 1 is along the circumferential direction evenly distributed 4P double wedge 1-1, and described 4P double wedge 1-1 sorts successively and be divided into 2P odd number double wedge 1-1-1 and 2P even number double wedge 1-1-2; The root of each double wedge 1-1 all is wound with the first coil 4-1, and the positive and negative successively alternate series connection of the described first coil 4-1 constitutes field winding 4; The top of described odd number double wedge 1-1-1 all is wound with the second coil 5-1, and the positive and negative successively alternate series connection of the described second coil 5-1 constitutes positive chorded winding 5; The top of described even number double wedge 1-1-2 all is wound with tertiary coil 6-1, and the positive and negative successively alternate series connection of described tertiary coil 6-1 constitutes cosine winding 6.

Resolver of the present invention has following two characteristics: one, the outer round surface of rotor is for the waveform by the sineization design, so the rotor airgap magnetic conductance can be represented: G (a)=G ₀+ G ₁Cos P θ, in the formula, G ₀Be average magnetic conductance, G ₁Be first-harmonic magnetic conductance amplitude, P is a number of pole-pairs, and θ is the rotor circumference tangential coordinates; Two, field winding, positive chorded winding and cosine winding are the layout of positive and negative alternate series connection.According to the positive and negative series arrangement of field winding, when field winding passed to the constant voltage sinusoidal ac, its tooth air gap pulsating magnetic flux can be expressed as

${\mathrm{\φ}}_i={\mathrm{\φ}}_0+{(-1)}^{(i+1)}{\mathrm{\φ}}_1\cos [(i-1)\frac{\mathrm{\π}}{2}+\mathrm{Pa}],$ In the formula, φ ₀Be magnetic flux average weight, φ ₁Be the magnetic flux fundametal compoment, i is the stator tooth sequence number, i=1～4P; A is an angle of rotor.

Therefore the magnetic linkage of field winding can be expressed as

${\mathrm{\ψ}}_f=\underset{i=1}{\overset{4P}{\mathrm{\Σ}}}{W}_f{(-1)}^{(i+1)}{\mathrm{\φ}}_i=4P{W}_f{\mathrm{\φ}}_0,$ In the formula, W _fIt is the number of turn of the first coil 4-1.

As can be seen from the above equation, the magnetic linkage of field winding and angle of rotor are irrelevant, so input impedance is a normal value.The same positive and negative series arrangement according to the cosine winding, the magnetic linkage of cosine winding can be expressed as

${\mathrm{\ψ}}_f=\underset{i=\mathrm{1.3.5}}{\overset{4P-1}{\mathrm{\Σ}}}W{(-1)}^{\left(\frac{i-1}{2}\right)}{\mathrm{\φ}}_i=2PW{\mathrm{\φ}}_1\cos \mathrm{Pa}$

In the formula, W is the number of turn of tertiary coil 6-1.So the electromotive force of cosine winding output can be expressed as E _c=E _mCos Pa, in the formula, E _mBe the electromotive force amplitude.Equally, the electromotive force that can obtain positive chorded winding is E _s=E _mSin Pa.

From above-mentioned formula as can be seen, cosine winding and positive chorded winding will be exported the electromotive force amplitude respectively and make the voltage of P sine and varies with cosine with angle of rotor, thereby realize the function of two-phase multipolar resolver.Of the present invention simple in structure, easy to make, be specially adapted to the brushless DC motor rotor-position sensor.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Embodiment

Embodiment one: as shown in Figure 1, the resolver of this embodiment is made up of rotor 2, stator 1, the first coil 4-1, the second coil 5-1 and tertiary coil 6-1, is provided with air gap 3 between the internal circular surfaces of the outer round surface of described rotor 2 and stator 1; The outer round surface of described rotor 2 evenly is provided with P crest and P trough, and the mutual slyness of described crest and trough connects and composes the waveform outer round surface of rotor 2, and wherein, P is the number of pole-pairs of this resolver; The internal circular surfaces of described stator 1 has a plurality of groove 1-2 vertically, between described adjacent two groove 1-2 double wedge 1-1 is arranged, the internal circular surfaces of described stator 1 is along the circumferential direction evenly distributed 4P double wedge 1-1, and described 4P double wedge 1-1 sorts successively and be divided into 2P odd number double wedge 1-1-1 and 2P even number double wedge 1-1-2; The root of each double wedge 1-1 all is wound with the first coil 4-1, and the positive and negative successively alternate series connection of the described first coil 4-1 constitutes field winding 4, and leading-out terminal F ₁And F ₂The top of described odd number double wedge 1-1-1 all is wound with the second coil 5-1, and the positive and negative successively alternate series connection of the described second coil 5-1 constitutes positive chorded winding 5, and leading-out terminal S ₁And S ₂The top of described even number double wedge 1-1-2 all is wound with tertiary coil 6-1, and the positive and negative successively alternate series connection of described tertiary coil 6-1 constitutes cosine winding 6, and leading-out terminal C ₁And C ₂Above-mentioned leading-out terminal F ₁And F ₂Connect the constant voltage AC power.Clearance G on the outer round surface of described rotor 2 between crest top and described stator 1 internal circular surfaces _MinIt is 0.3～1.0 millimeter.Clearance G on the outer round surface of described rotor 2 between trough bottom and described stator 1 internal circular surfaces _MaxBe 4+G _Min

Embodiment two: as shown in Figure 1, this embodiment with the difference of embodiment one is: described stator 1 and rotor 2 are formed by stacking by a plurality of electrical sheet punchings.Other compositions are identical with embodiment one with annexation.

Embodiment three: as shown in Figure 1, this embodiment with the difference of embodiment one is: the number of turn of described second coil 5-1 and tertiary coil 6-1 is identical.Other compositions are identical with embodiment one with annexation.

Embodiment four: as shown in Figure 1, the difference of this embodiment and embodiment one is: the clearance G on the outer round surface of described rotor 2 between crest top and described stator 1 internal circular surfaces _MinBe 0.4 millimeter, the clearance G on the outer round surface of described rotor 2 between trough bottom and described stator 1 internal circular surfaces _MaxIt is 4.4 millimeters.Other compositions are identical with embodiment one with annexation.

Embodiment five: as shown in Figure 1, the difference of this embodiment and embodiment one is: the clearance G on the outer round surface of described rotor 2 between crest top and described stator 1 internal circular surfaces _MinBe 0.6 millimeter, the clearance G on the outer round surface of described rotor 2 between trough bottom and described stator 1 internal circular surfaces _MaxIt is 4.6 millimeters.Other compositions are identical with embodiment one with annexation.

Embodiment six: as shown in Figure 1, the difference of this embodiment and embodiment one is: the clearance G on the outer round surface of described rotor 2 between crest top and described stator 1 internal circular surfaces _MinBe 1.0 millimeters, the clearance G on the outer round surface of described rotor 2 between trough bottom and described stator 1 internal circular surfaces _MaxIt is 5.0 millimeters.Other compositions are identical with embodiment one with annexation.

Claims (8)

1, magnetoresistance brushless multi-polar rotation transformer, described resolver comprise rotor (2) and stator (1), are provided with air gap (3) between the internal circular surfaces of the outer round surface of described rotor (2) and stator (1); It is characterized in that described resolver also comprises first coil (4-1), second coil (5-1) and tertiary coil (6-1); The outer round surface of described rotor (2) evenly is provided with P crest and P trough, and the mutual slyness of described crest and trough connects and composes the waveform outer round surface of rotor (2), and wherein, P is the number of pole-pairs of this resolver; The internal circular surfaces of described stator (1) has a plurality of grooves (1-2) vertically, double wedge (1-1) is arranged between described adjacent two grooves (1-2), the internal circular surfaces of described stator (1) is along the circumferential direction evenly distributed 4P double wedge (1-1), and a described 4P double wedge (1-1) sorts successively and is divided into 2P odd number double wedge (1-1-1) and 2P even number double wedge (1-1-2); The root of each double wedge (1-1) all is wound with first coil (4-1), and the positive and negative successively alternate series connection of described first coil (4-1) constitutes field winding (4); The top of described odd number double wedge (1-1-1) all is wound with second coil (5-1), and the positive and negative successively alternate series connection of described second coil (5-1) constitutes positive chorded winding (5); The top of described even number double wedge (1-1-2) all is wound with tertiary coil (6-1), and the positive and negative successively alternate series connection of described tertiary coil (6-1) constitutes cosine winding (6).

2, magnetoresistance brushless multi-polar rotation transformer according to claim 1 is characterized in that described stator (1) and rotor (2) are formed by stacking by a plurality of electrical sheet punchings.

3, magnetoresistance brushless multi-polar rotation transformer according to claim 1 is characterized in that described second coil (5-1) is identical with the number of turn of tertiary coil (6-1).

4, magnetoresistance brushless multi-polar rotation transformer according to claim 1 is characterized in that the gap (G between the crest top and described stator (1) internal circular surfaces on the outer round surface of described rotor (2) _Min) be 0.3～1.0 millimeter.

5, magnetoresistance brushless multi-polar rotation transformer according to claim 4 is characterized in that the gap (G between the trough bottom and described stator (1) internal circular surfaces on the outer round surface of described rotor (2) _Max) be 4.3～5.0 millimeters.

6, magnetoresistance brushless multi-polar rotation transformer according to claim 5 is characterized in that the gap (G between the crest top and described stator (1) internal circular surfaces on the outer round surface of described rotor (2) _Min) be 0.4 millimeter, the gap (G on the outer round surface of described rotor (2) between trough bottom and described stator (1) internal circular surfaces _Max) be 4.4 millimeters.

7, magnetoresistance brushless multi-polar rotation transformer according to claim 5 is characterized in that the gap (G between the crest top and described stator (1) internal circular surfaces on the outer round surface of described rotor (2) _Min) be 0.6 millimeter, the gap (G on the outer round surface of described rotor (2) between trough bottom and described stator (1) internal circular surfaces _Max) be 4.6 millimeters.

8, magnetoresistance brushless multi-polar rotation transformer according to claim 5 is characterized in that the gap (G between the crest top and described stator (1) internal circular surfaces on the outer round surface of described rotor (2) _Min) be 1.0 millimeters, the gap (G on the outer round surface of described rotor (2) between trough bottom and described stator (1) internal circular surfaces _Max) be 5.0 millimeters.

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