CN105304300B - The magnetoresistance transformer being axially movable - Google Patents
The magnetoresistance transformer being axially movable Download PDFInfo
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- CN105304300B CN105304300B CN201510645965.0A CN201510645965A CN105304300B CN 105304300 B CN105304300 B CN 105304300B CN 201510645965 A CN201510645965 A CN 201510645965A CN 105304300 B CN105304300 B CN 105304300B
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Abstract
The present invention relates to transformer technology field, more particularly to a kind of magnetoresistance transformer.The magnetoresistance transformer being axially movable, including stator and rotor, stator core length and rotor core length are different, first determine shorter square iron core length in stator or rotor, and a longer square iron core determines in the following way：LC=LD+LX+ (2~4) δ.By adopting the above-described technical solution, the rotary transformer that the present invention designs, is allowing in addition to rotating, while can axially move within the specific limits, and its parameter and property retention are constant.
Description
Technical field
The present invention relates to rotary transformer technology field, more particularly to a kind of magnetoresistance transformer.
Background technology
In in general rotary motion, moving component only rotates under the support of bearing.Stationary part and rotation
Axial relative position, which is not done, between part changes.But under some special occasions, rotated except requiring that moving component is done
Outside motion, also need to axially move.This requires the speed to match therewith and position sensing element, it is also necessary to has such work(
Energy.Rotary transformer is used in angle position when rotating and the sensor of rotary speed.Traditional rotary transformer
Structure and principle are only adapted to rotate, and can not allow to move axially simultaneously, and otherwise parameter and performance can be changed, become
It is bad, and due effect can not be played.
The stator of traditional rotary transformer and the axial dimension of rotor, typically it is designed to equal or close.It is such
Design both can guarantee that performance, and and can saves space.But when there is axial dipole field, flux coupled situation changes, electromagnetic parameter
Can all be changed with performance, as shown in figure 1, stator 1, rotor 2, Fig. 1 a) be stator-rotor iron core equal length situation, figure
It is 1b) that situation, rotor core length that stator-rotor iron core length does not wait are more slightly longer than stator core；This stator-rotor iron core in the case of two
Axial centre is to overlap, and all standing can be realized each other between rotor.Fig. 1 c) it is the situation for having axial dipole field, rotor
Magnetic center line it is mutually not overlapping and (offset is represented with Δ d in figure).As can be seen that with the increasing of rotor axial displacement, each other
Mutually the area of covering is gradually reduced.At this moment, compared with when with rotor axial direction, core center coincides, because coupling area reduces,
Output signal reduces, electrical error becomes big, and other electromagnetic parameters also will accordingly change.If Axial changes are excessive, so that
It is disengaged from, at that time just without coupling.So when Fig. 1 c being present) it is this when having axial dipole field, how to determine core length
It is crucial.
The content of the invention
It is an object of the present invention to provide a kind of magnetoresistance transformer being axially movable, and solves above technology and asks
Topic.
Technical problem solved by the invention can be realized using following technical scheme：
The magnetoresistance transformer being axially movable, including stator and rotor, the stator core length and described turn
Sub- core length is different, it is first determined shorter square iron core length in stator or rotor, and a longer square iron core uses such as lower section
Formula determines：
LC=LD+LX+ (2~4) δ (1)
Wherein, LCFor longer square iron core length in stator or rotor；
LDFor shorter square iron core length in stator or rotor；
LXFor the ultimate range of stator and rotor when axially moving；
Gas lengths of the δ between stator and rotor.
When stator core length and the rotor core length difference, shorter square iron core length can join according to electromagnetism
Number and structure need, and are calculated using conventional method, to determine length.
In all axial movements, a shorter square iron core must be completely covered in a longer square iron core, and the present invention is using above-mentioned
Mode determines core length so that when there is axial dipole field, the area that stator and rotor cover each other remains to keep constant, simultaneously
Solve problem in the calculating that is brought due to axial dipole field, it is determined that suitably, correct physical dimension, realize that performance is constant, parameter
It is constant.
Using the rotary transformer of mentioned above principle, rotated as angle, velocity sensor in use, allowing to remove
Outside, while can axially move within the specific limits, and its parameter and property retention are constant.
In electromagnetism calculating, effective core length refers to participate in the length calculated, different from general actual core length,
Effective core length must account for the end edge effect in magnetic field, and the present invention calculates effective core length with the following method
Le：
When the stator core length is consistent with the rotor core length or the stator core length and the rotor
When core length phase difference is not more than 3 times of air gap deltas：
Wherein, Le is effective core length；
LSFor stator core length；
LRFor rotor core length；
Gas lengths of the δ between stator and rotor；
When the stator core length and the rotor core length phase difference Δ L=| Ls-LR| during 3 δ of ＞：
Le=LD+lδ (3)
lδ=4 δ (4)
Wherein, Le is effective core length；
LDFor shorter square iron core length in stator or rotor；
lδFor length increment；
Gas lengths of the δ between stator and rotor.
In the design, the determination of stator or rotor core length is crucial.In electromagnetic design, and air gap and core length
Relevant parameter is to calculate effective core length Le.The radial dimension of air gap between rotor is referred to as gas length, is making
When electromagnetism calculates, the edge effect of air gap is should be taken into account, so can not be simply core length size geometrically as electricity
Magnetic calculating parameter.The Electromagnetic Desigu Method of the present invention, can solve the computational problem brought due to axial dipole field.
When the stator core length is with the rotor core length difference, length can be selected as the case may be,
It is preferred to use the rotor core length is longer than the stator core length.
Beneficial effect：By adopting the above-described technical solution, the rotary transformer that the present invention designs, is allowing to remove to do to rotate
Motion is outer, while can axially move within the specific limits, and its parameter and property retention are constant.
Brief description of the drawings
Fig. 1 a) structural representation when being stator-rotor iron core equal length；
Fig. 1 b) it is stator-rotor iron core anisochrouous structural representation；
Fig. 1 c) structural representation when being stator-rotor iron core axial dipole field；
Fig. 2 a) be long rotor-type structural representation；
Fig. 2 b) be long stator type structural representation；
Fig. 3 a) for stator-rotor iron core longitudinal center line it is consistent when position view；
Fig. 3 b) position view when being moved to the left maximum for rotor axial；
Fig. 3 c) for rotor axial move right maximum when position view；
Fig. 4 a) for stator-rotor iron core it is equal when magnetic field schematic diagram；
Fig. 4 b) it is stator-rotor iron core anisochrouous magnetic field schematic diagram；
Fig. 4 c) for stator-rotor iron core length differ by more than magnetic field schematic diagram in the case of 3 δ.
Embodiment
In order to which the technical means, the inventive features, the objects and the advantages of the present invention are easy to understand, with reference to
It is specifically illustrating, the present invention is expanded on further.
Reference picture 2 is to Fig. 4, the magnetoresistance transformer being axially movable, including stator 1 and rotor 2, as shown in Fig. 2
Fig. 2 a) rotor core length be longer than stator core length, Fig. 2 b) rotor core length be shorter than stator core length, can be with
Length is selected as the case may be, it is preferred to use rotor core length is longer than stator core length.In Fig. 2, Ls is stator
Core length, LRFor rotor core length, gas lengths of the δ between rotor.
In the design, the determination of stator or rotor core length is crucial.In electromagnetic design, and air gap and core length
Relevant parameter is to calculate effective core length Le.The radial dimension of air gap between rotor is making electromagnetism meter as air gap
During calculation, the edge effect of air gap is should be taken into account, so simply core length size geometrically can not be calculated as electromagnetism
Parameter.As shown in figure 4, main air-gap field 3, peripheral air gap magnetic field 4, Fig. 4 a) situation when being stator-rotor iron core equal length, figure
It is 4b) situation when stator-rotor iron core length has less difference, Fig. 4 c) be stator-rotor iron core length phase difference Δ L=| Ls-
LR | situation during 3 δ of ＞.The influence that edge effect is calculated magnetic circuit is quite complicated, and the present invention calculates effective iron with the following method
Core length Le：
When stator core length is consistent with rotor core length or stator core length and rotor core length phase difference not
During more than 3 times of air gap deltas, i.e. Fig. 4 a) and Fig. 4 b) in the case of：
Wherein, Le is effective core length；
LSFor stator core length；
LRFor rotor core length；
Gas lengths of the δ between stator and rotor；
When stator core length and rotor core length phase difference Δ L=| Ls-LR| during 3 δ of ＞, i.e. Fig. 4 c) in the case of：
Le=LD+lδ
lδ=4 δ
Wherein, Le is effective core length；
LDFor shorter square iron core length in stator or rotor；
lδFor length increment；
Gas lengths of the δ between stator and rotor.
In addition to the effective core length Le of above-mentioned calculating problems of value, it is necessary to consider longer square iron core length
Determine problem.As shown in figure 3, rotor core length is longer than stator core length, situation when rotor axially moves,
Lx is the ultimate range being axially moved.Fig. 3 a) it is situation when rotor center line is consistent, wherein stator is used as a shorter square iron
Core length LD, the longer square iron core length L of rotor conductC.Fig. 3 b) it is position (Lx/2) when rotor is moved to the left maximum, figure
3c) be rotor move right maximum when position (Lx/2).
The present invention calculates stator-rotor iron core length in the following way：
1) according to electromagnetic parameter and structure needs, shorter square iron core length in stator or rotor is determined.Calculate determination side
Method is consistent with conventional method, will not be described in detail herein.
2) in all axial movements, a shorter square iron core, a longer square iron core must be completely covered in a longer square iron core
The calculation formula of determination is：
LC=LD+LX+ (2~4) δ
Wherein, LCFor longer square iron core length in stator or rotor；
LDFor shorter square iron core length in stator or rotor；
LXFor the ultimate range of stator and rotor when axially moving；
Gas lengths of the δ between stator and rotor.
Embodiment one：
One rotates system, while axially to do 30mm motion, it is necessary to which one can accurately sense rotation
Angle signal and can does the magnetoresistance transformer of axial 30mm motions.The controlled motor of kinematic system is 4 pairs of poles, so with
The magnetoresistance transformer designed based on the present invention is also designed to 4 pairs of poles.
1) determined by electromagnetic design, stator core axial length LD5mm is taken, air gap delta is taken as 0.65mm, LXFor 30mm.This
Sample, rotor core length LC：
LC=5+30+3 × 0.65=36.95mm
2) Δ L=| Ls-LR|=| 36.95-5 |=34.95mm ＞ 3 δ, so effective core length Le：
Le=5+4 × 0.65=7.6mm.
The general principle and principal character advantages of the present invention of the present invention are shown and described above.The technical staff of the industry
It should be recognized that the present invention is not limited by above-mentioned application method, simply the present invention is said described in above-mentioned application method and specification
Principle, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these change and
Improvement both falls within the claimed scope of the invention claimed scope of the invention by appended claims and its equivalent
Define.
Claims (1)
1. the magnetoresistance transformer being axially movable, including stator and rotor, it is characterised in that the stator core length
It is different with the rotor core length, shorter square iron core length in stator or rotor is first determined, and a longer square iron core uses
Following manner determines：
LC=LD+LX+ (2~4) δ (1)
Wherein, LCFor longer square iron core length in stator or rotor；
LDFor shorter square iron core length in stator or rotor；
LXFor the ultimate range of stator and rotor when axially moving；
Gas lengths of the δ between stator and rotor；
Effective core length Le is calculated with the following method：
When the stator core length is consistent with the rotor core length or the stator core length and the rotor core
When length phase difference is not more than 3 times of air gap deltas：
<mrow>
<msub>
<mi>L</mi>
<mi>e</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>L</mi>
<mi>S</mi>
</msub>
<mo>+</mo>
<msub>
<mi>L</mi>
<mi>R</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mi>&delta;</mi>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, Le is effective core length；
LSFor stator core length；
LRFor rotor core length；
Gas lengths of the δ between stator and rotor；
When the stator core length and the rotor core length phase difference Δ L=| Ls-LR| during 3 δ of ＞：
Le=LD+lδ (3)
lδ=4 δ (4)
Wherein, Le is effective core length；
LDFor shorter square iron core length in stator or rotor；
lδFor length increment；
Gas lengths of the δ between stator and rotor；
The rotor core length is shorter than the stator core length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645965.0A CN105304300B (en) | 2015-10-08 | 2015-10-08 | The magnetoresistance transformer being axially movable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645965.0A CN105304300B (en) | 2015-10-08 | 2015-10-08 | The magnetoresistance transformer being axially movable |
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| CN105304300A CN105304300A (en) | 2016-02-03 |
| CN105304300B true CN105304300B (en) | 2018-01-16 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106253621B (en) * | 2016-09-29 | 2018-09-18 | 日本电产凯宇汽车电器（江苏）有限公司 | A kind of EPS brushless motors of rotor unequal length |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2446394A1 (en) * | 1974-09-27 | 1976-04-15 | Siemens Ag | Stepper motor for driving printing head - has magnetic means for axially displacing rotor in desired direction |
| JP2009027842A (en) * | 2007-07-19 | 2009-02-05 | Toshiba Corp | Permanent-magnet synchronous motor |
| CN202978476U (en) * | 2012-12-17 | 2013-06-05 | 上海德驱驰电气有限公司 | Shaft feeding motor |
| CN104393692A (en) * | 2014-12-16 | 2015-03-04 | 安徽威能电机有限公司 | Electric motor |
| CN205016367U (en) * | 2015-10-08 | 2016-02-03 | 上海赢双电机有限公司 | Decide vernier resolver that rotor axial length is different |
-
2015
- 2015-10-08 CN CN201510645965.0A patent/CN105304300B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2446394A1 (en) * | 1974-09-27 | 1976-04-15 | Siemens Ag | Stepper motor for driving printing head - has magnetic means for axially displacing rotor in desired direction |
| JP2009027842A (en) * | 2007-07-19 | 2009-02-05 | Toshiba Corp | Permanent-magnet synchronous motor |
| CN202978476U (en) * | 2012-12-17 | 2013-06-05 | 上海德驱驰电气有限公司 | Shaft feeding motor |
| CN104393692A (en) * | 2014-12-16 | 2015-03-04 | 安徽威能电机有限公司 | Electric motor |
| CN205016367U (en) * | 2015-10-08 | 2016-02-03 | 上海赢双电机有限公司 | Decide vernier resolver that rotor axial length is different |
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Address after: 201100 Building 1, 2 and 3, No. 1230, Beiwu Road, Minhang District, Shanghai Patentee after: Shanghai Yingshuang Motor Technology Co.,Ltd. Address before: 201100 Room 6100, 6th Floor, Comprehensive Business Building, No. 951, Jianchuan Road, Minhang District, Shanghai Patentee before: SHANGHAI WIN DOUBLE ELECTRIC Co.,Ltd. |
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