CN105304300A - Variable reluctance resolver capable of axial movement - Google Patents

Abstract

The invention relates to the technical field of transformers, in particular to a variable reluctance resolver. The variable reluctance resolver capable of axial movement comprises a stator and a rotor, the core length of the stator is different from that of the rotor, the core length of the shorter one is firstly determined, and the core length of the longer one is determined in the manner that LC=LD+LX+(2~4)*delta. Due to the adoption of the technical scheme, the resolver designed in the invention can also perform axial movement in a certain range besides being permitted to perform rotary movement, and the parameters and performance of the resolver remain unchanged.

Description

The magnetoresistance transformer that can move axially

Technical field

The present invention relates to rotary transformer technology field, particularly relate to a kind of magnetoresistance transformer.

Background technology

In general rotary motion, moving component, under the support of bearing, only rotates.Relative position axial between stationary part and rotating part does not do and changes.But under some special occasions, except requiring that moving component rotates, also need to axially move.This just requires the speed that matches with it and position sensing element, also must have such function.Resolver is the transducer being used in angle position when rotating and rotary speed.Structure and the principle of tradition resolver only adapt to rotate, and can not allow to move axially simultaneously, otherwise parameter and performance can change, degenerate, and cannot play due effect.

The axial dimension of stators and rotators of tradition resolver, be all be generally designed to equal or close.Such design can guaranteed performance, can save space again.But when there being axial dipole field, flux coupled situation changes, electromagnetic parameter and performance all can change, as shown in Figure 1, stator 1, rotor 2, Fig. 1 is a) situation that stator-rotor iron core length is equal, Fig. 1 b) be that situation, rotor core length that stator-rotor iron core length does not wait are slightly longer than stator core; In this two situation, the axial centre of stator-rotor iron core overlaps, and can realize all standing each other between rotor.Fig. 1 c) be the situation having axial dipole field, the magnetic center line of rotor is not mutually overlapping and (representing side-play amount with Δ d in figure).Can find out, along with the increasing of rotor axial displacement, the area covered mutually each other reduces gradually.At this moment, compared with when coinciding with the axial core center of rotor, because coupling area reduces, output signal reduces, electrical error becomes large, and other electromagnetic parameters also want corresponding changing.If Axial changes is excessive, to such an extent as to depart from each other, be not just coupled at that time.So when there is Fig. 1 c) this when there being axial dipole field, how to determine that core length is crucial.

Summary of the invention

The object of the invention is to, a kind of magnetoresistance transformer moved axially is provided, solves above technical problem.

Technical problem solved by the invention can realize by the following technical solutions:

The magnetoresistance transformer that can move axially, comprises stators and rotators, and described stator core length is different with described rotor core length, first determine a shorter square iron core length in stator or rotor, and a longer square iron core is determined in the following way:

L _C＝L _D+L _X+(2～4)δ(1)

Wherein, L _cfor a square iron core length longer in stator or rotor;

L _dfor a square iron core length shorter in stator or rotor;

L _xfor the ultimate range of stators and rotators when axially moving;

δ is the gas length between stators and rotators.

When stator core length is different with described rotor core length, a shorter square iron core length according to electromagnetic parameter and structure needs, can adopt conventional method to calculate, determines length.

In all axial motions, a longer square iron core must cover a shorter square iron core completely, the present invention adopts aforesaid way determination core length, make when there being axial dipole field, the area that stators and rotators covers each other still can remain unchanged, solve problem in the calculating brought due to axial dipole field simultaneously, determine suitable, correct physical dimension, realize that performance is constant, parameter constant.

Adopt the resolver of mentioned above principle, when using as angle, velocity transducer, allow except rotating, can axially move within the specific limits simultaneously, and its parameter and property retention constant.

In electromagnetism calculates, effective core length refers to the length participating in calculating, and be different from general actual core length, effective core length must consider the end edge effect in magnetic field, and the present invention adopts and calculates effective core length Le with the following method:

When described stator core length is consistent with described rotor core length or described stator core length and described rotor core length phase difference are not more than 3 times of air gap delta:

$L_e=\frac{1}{2}(L_S+L_R)+\mathrm{\δ}---\left(2\right)$

Wherein, Le is effective core length;

L _sfor stator core length;

L _rfor rotor core length;

δ is the gas length between stators and rotators;

As described stator core length and described rotor core length phase difference DELTA L=|Ls-L _r| during > 3 δ:

L _e＝L _D+l _δ(3)

l _δ＝4δ(4)

Wherein, Le is effective core length;

L _dfor a square iron core length shorter in stator or rotor;

L _δfor length increment;

δ is the gas length between stators and rotators.

In the design, the determination of stator or rotor core length is crucial.In Electromagnetic Design, the parameter relevant with air gap and core length calculates effective core length Le.The radial dimension of the air gap between rotor is referred to as gas length, when making electromagnetism and calculating, should be taken into account the edge effect of air gap, so simply core length size geometrically can not be used as electromagnetism calculating parameter.Electromagnetic Desigu Method of the present invention, can solve the computational problem brought due to axial dipole field.

When described stator core length is different with described rotor core length, length can be selected as the case may be, but preferably adopt described rotor core length to be longer than described stator core length.

Beneficial effect: owing to have employed technique scheme, the resolver of the present invention's design, in permission except rotating, can axially move within the specific limits simultaneously, and its parameter and property retention constant.

Accompanying drawing explanation

Fig. 1 a) for stator-rotor iron core length equal time structural representation;

Fig. 1 b) be stator-rotor iron core anisochrouous structural representation;

Fig. 1 c) be structural representation during stator-rotor iron core axial dipole field;

Fig. 2 is a) structural representation of long rotor-type;

Fig. 2 b) be the structural representation of long stator type;

Fig. 3 a) for stator-rotor iron core longitudinal center line consistent time position view;

Fig. 3 b) be position view when rotor axial is moved to the left maximum;

Fig. 3 c) be position view when rotor axial moves right maximum;

Fig. 4 a) for stator-rotor iron core equal time magnetic field schematic diagram;

Fig. 4 b) be stator-rotor iron core anisochrouous magnetic field schematic diagram;

Fig. 4 c) differ by more than the magnetic field schematic diagram in 3 δ situations for stator-rotor iron core length.

Embodiment

The technological means, the creation characteristic that realize in order to the present invention, reach object and effect is easy to understand, below in conjunction with concrete diagram, set forth the present invention further.

With reference to Fig. 2 to Fig. 4, the magnetoresistance transformer that can move axially, comprise stator 1 and rotor 2, as shown in Figure 2, Fig. 2 rotor core length a) is longer than stator core length, Fig. 2 b) rotor core length be shorter than stator core length, length can be selected as the case may be, but preferably adopt rotor core length to be longer than stator core length.In Fig. 2, Ls is stator core length, L _rfor rotor core length, δ is the gas length between rotor.

In the design, the determination of stator or rotor core length is crucial.In Electromagnetic Design, the parameter relevant with air gap and core length calculates effective core length Le.The radial dimension of the air gap between rotor, as air gap, when making electromagnetism and calculating, should be taken into account the edge effect of air gap, so simply core length size geometrically can not be used as electromagnetism calculating parameter.As shown in Figure 4, main air-gap field 3, peripheral air gap magnetic field 4, Fig. 4 a) be stator-rotor iron core length equal time situation, Fig. 4 b) be the situation of stator-rotor iron core length when having a less difference, Fig. 4 c) situation when being stator-rotor iron core length phase difference DELTA L=|Ls-LR| > 3 δ.The impact that edge effect calculates magnetic circuit is quite complicated, and the present invention adopts and calculates effective core length Le with the following method:

When stator core length is consistent with rotor core length or stator core length and rotor core length phase difference are not more than 3 times of air gap delta, namely Fig. 4 a) and Fig. 4 b) in situation:

$L_e=\frac{1}{2}(L_S+L_R)+\mathrm{\δ}$

Wherein, Le is effective core length;

L _sfor stator core length;

L _rfor rotor core length;

δ is the gas length between stators and rotators;

As stator core length and rotor core length phase difference DELTA L=|Ls-L _r| during > 3 δ, i.e. Fig. 4 c) in situation:

L _e＝L _D+l _δ

l _δ＝4δ

Wherein, Le is effective core length;

L _dfor a square iron core length shorter in stator or rotor;

L _δfor length increment;

δ is the gas length between stators and rotators.

Except the problems of value of the effective core length Le of above-mentioned calculating, also must consider the problem identificatioin of a longer square iron core length.As shown in Figure 3, rotor core length is longer than stator core length, situation when rotor axially moves, and Lx is the ultimate range of axial motion.Fig. 3 a) be rotor center line consistent time situation, wherein stator is as a shorter square iron core length L _d, rotor is as a longer square iron core length L _c.Fig. 3 b) be the position (Lx/2) of rotor when being moved to the left maximum, Fig. 3 c) be the position (Lx/2) of rotor when moving right maximum.

The present invention calculates stator-rotor iron core length in the following way:

1) according to electromagnetic parameter and structure needs, a shorter square iron core length in stator or rotor is determined.Calculate defining method consistent with conventional method, be not described in detail in this.

2) in all axial motions, a longer square iron core must cover a shorter square iron core completely, and the computing formula that a longer square iron core is determined is:

L _C＝L _D+L _X+(2～4)δ

Wherein, L _cfor a square iron core length longer in stator or rotor;

L _dfor a square iron core length shorter in stator or rotor;

L _xfor the ultimate range of stators and rotators when axially moving;

δ is the gas length between stators and rotators.

Embodiment one:

One rotates system, simultaneously will in the motion being axially 30mm, needs one the angle signal of accurate sensing rotation can do again the magnetoresistance transformer of axial 30mm motion.The control motor of kinematic system is 4 to pole, so the magnetoresistance transformer designed based on the present invention is also designed to 4 to pole.

1) determined by Electromagnetic Design, stator core axial length L _dget 5mm, air gap delta is taken as 0.65mm, L _xfor 30mm.Like this, rotor core length L _c:

L _C＝5+30+3×0.65＝36.95mm

2) Δ L=|Ls-L _r|=| 36.95-5|=34.95mm > 3 δ, so effective core length Le:

Le＝5+4×0.65＝7.6mm。

More than show and describe general principle of the present invention and principal character advantage of the present invention.The technical staff of the industry should understand the present invention not by the restriction of above-mentioned using method; what describe in above-mentioned using method and specification just says principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall into application claims protection range in the claimed scope of the invention and defined by appending claims and equivalent thereof.

Claims (3)

1. the magnetoresistance transformer that can move axially, comprise stators and rotators, it is characterized in that, described stator core length is different with described rotor core length, first determine a shorter square iron core length in stator or rotor, and a longer square iron core is determined in the following way:

L _C＝L _D+L _X+(2～4)δ(1)

Wherein, L _cfor a square iron core length longer in stator or rotor;

L _dfor a square iron core length shorter in stator or rotor;

L _xfor the ultimate range of stators and rotators when axially moving;

δ is the gas length between stators and rotators.

2. the magnetoresistance transformer moved axially according to claim 1, is characterized in that: adopt and calculate effective core length Le with the following method:

When described stator core length is consistent with described rotor core length or described stator core length and described rotor core length phase difference are not more than 3 times of air gap delta:

$L_e=\frac{1}{2}(L_S+L_R)+\mathrm{\δ}---\left(2\right)$

Wherein, Le is effective core length;

L _sfor stator core length;

L _rfor rotor core length;

δ is the gas length between stators and rotators;

As described stator core length and described rotor core length phase difference DELTA L=|Ls-L _r| during > 3 δ:

L _e＝L _D+l _δ(3)

l _δ＝4δ(4)

Wherein, Le is effective core length;

L _dfor a square iron core length shorter in stator or rotor;

L _δfor length increment;

δ is the gas length between stators and rotators.

3. the magnetoresistance transformer moved axially according to claim 1 and 2, is characterized in that: when described stator core length is different with described rotor core length, adopts described rotor core length to be longer than described stator core length.