CN208608878U - Rotary transformer - Google Patents
Rotary transformer Download PDFInfo
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- CN208608878U CN208608878U CN201821022202.6U CN201821022202U CN208608878U CN 208608878 U CN208608878 U CN 208608878U CN 201821022202 U CN201821022202 U CN 201821022202U CN 208608878 U CN208608878 U CN 208608878U
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Abstract
The utility model proposes a kind of rotary transformers, it include: stator, including stator core and the input winding being wound around on stator core and output winding, multiple stator slots are opened up on the inner sidewall of stator core, multiple stator slots are circumferentially distributed, and be respectively connected two end faces of stator core, stator tooth is formed between the stator slot for keeping any two adjacent, with winding input winding respectively and output winding；Rotor, including rotor core；Wherein, the air gap is limited between the inner sidewall of stator core and the lateral wall of rotor core, in rotor rotation, the length δ of the air gap circumferentially meets the SIN function relationship comprising third-harmonic component with the mechanical corner θ of rotor, and periodically-varied is executed according to functional relation, to limit the shape of rotor core.By the technical solution of the utility model, in the case where identical minimum and maximum air gap, the output signal amplitude and positional accuracy measurement of rotary transformer can be improved.
Description
Technical field
The utility model relates to field transformers, in particular to a kind of rotary transformer.
Background technique
Rotary transformer is a kind of electromagnetic sensor, also known as synchronous decomposer, for measuring the shaft angle of rotating object
Displacement and angular speed, are made of, wherein round edge of the stator winding as transformer receives excitation voltage, rotor stator and rotor
Secondary side of the winding as transformer obtains induced voltage by electromagnetic coupling, and due to the primary side of selection transformer, vice-side winding
The variation of relative position occurs with the angular displacement of rotor, thus the size of its output voltage becomes with the angular displacement of rotor
Change, the voltage magnitude and angle of rotor for exporting winding are in sinusoidal, cosine function relationship.
Simple, stability is high, temperature tolerance is good and is widely used in security performance and wants due to making for salient pole type rotary transformer
Ask high occasion, such as electric motor of automobile.In the related technology, as shown in Figure 1, the field spider of salient pole type rotary transformer generallys use
The rotor profile of Sine distribution, but have the following deficiencies:
Rotor error is big, the position precision of rotary transformer is not high.
Utility model content
At least one in order to solve the above-mentioned technical problem, one of the utility model is designed to provide a kind of rotation transformation
Device.
To achieve the goals above, the utility model embodiment proposes a kind of rotary transformer, comprising: stator, including
Stator core and the input winding being wound around on stator core and output winding, it is multiple fixed to open up on the inner sidewall of stator core
Pilot trench, multiple stator slots are circumferentially distributed, and are respectively connected two end faces of stator core, make the stator that any two are adjacent
Stator tooth is formed between slot, with winding input winding respectively and output winding；Rotor, including rotor core, rotor core are arranged
In stator core；Wherein, the air gap is limited between the inner sidewall of stator core and the lateral wall of rotor core, in rotor
When rotation, the length δ of the air gap circumferentially meets the SIN function comprising third-harmonic component with the mechanical corner θ of rotor and closes
System, and periodically-varied is executed according to functional relation, to limit the shape of rotor core.
In the technical scheme, rotary transformer is magnetoresistance transformer, will input winding and output winding (including
Sine windings and cosine winding) it is wound around on the stator tooth of stator core according to specified winding mode, to pass through input winding
Stator excitation is realized, by the electric potential signal of output winding output variation, by by the length δ (i.e. gas length) of the air gap
It is set as circumferentially meeting the SIN function relationship comprising third-harmonic component with the mechanical corner θ of rotor, to realize to rotation
Triple-frequency harmonics is injected in the air gap of transformer, to weaken the triple-frequency harmonics of output end output potential, so as to reduce magnetic resistance
The measurement error of formula rotary transformer, to improve the positional accuracy measurement of rotary transformer.
Since rotary transformer ensure that the magnetic flux distribution when rotor rotates a circle, in the air gap meets in structure
Sinusoidal rule, by the way that rotor shapes are done special designing, so that air-gap field is similar to sinusoidal, while by improving rotor shape
Shape realizes injection sinusoidal component three times, compared with the existing technology in sinusoidal can be subtracted by injecting sinusoidal component three times
Difference between small maximum air gap length and minimal air gap length reduces the same of the third harmonic interference in measurement process realizing
When, it still is able to identical output potential.
According to foregoing description, those skilled in the art is also understood that, using the rotor structure in the application,
It is constant in stator tooth quantity in the case that difference between maximum air gap length and minimal air gap length reduces, and umber of turn
Under the premise of constant, the potential of output is identical as the potential using rotor structure in the prior art output, thus using this
While rotor structure in application, do not reduce the difference between maximum air gap length and minimal air gap length, improves rotor
While position detection accuracy, the purpose for improving output potential may also reach up, so as to promote the operation of rotary transformer
Efficiency.
In addition, in order to generate biggish output signal, transformer rotor in the prior art by increase maximum air gap and
Difference is realized between minimal air gap, big so as to cause rotor profile size changing rate, for the requirement of rotor machining accuracy
It is higher, according to the rotor of the technical solution of the application, by injecting triple-frequency harmonics, additionally it is possible to reduce rotor machining difficulty.
In addition, the rotary transformer in above-mentioned technical proposal provided by the utility model can also have following supplementary technology
Feature:
In the above-mentioned technical solutions, it is preferable that input winding includes excitation winding；Output winding include sine windings with it is remaining
Chorded winding, wherein two stator tooths of interval setting between two excitation windings of arbitrary neighborhood, with winding sine windings respectively
With cosine winding.
In the technical scheme, by being spaced two stator tooths of setting between two excitation windings of arbitrary neighborhood, with
Winding sine windings and cosine winding respectively, so that excitation winding, sine windings and cosine winding are circumferentially spaced, in conjunction with
Stator excitation is realized by excitation winding, and forms special letter by sine windings and the output of cosine winding and the mechanical corner θ of rotor
The variable signal of number relationship realizes the position measurement essence for improving rotary transformer when injecting triple-frequency harmonics to the air gap
Degree.
Specifically, stator tooth includes the first stator tooth for winding excitation winding, the second stator of winding sine windings
The third stator tooth of tooth and winding cosine winding, wherein there is one second between two the first stator tooths of arbitrary neighborhood
Stator tooth and a third stator tooth.
In any of the above-described technical solution, it is preferable that a two sides winding in two excitation windings of arbitrary neighborhood is just
Chorded winding, another two sides winding cosine winding.
In the technical scheme, circumferentially distributed multiple stator tooths can be divided by the winding different according to winding
One stator tooth, the second stator tooth and third stator tooth, the first stator tooth, the second stator tooth are identical as the quantity of third stator tooth,
The excitation winding of signal input, and sine windings and cosine winding for signal output are used for winding respectively, wherein phase
Adjacent the first stator tooth, the second stator tooth and third stator tooth is one group of winding tooth, then circumferentially distributed multiple stator tooths are by more
Group winding tooth composition, to realize that the regular winding of magnetoresistance transformer is mentioned in conjunction with the injection of sinusoidal component three times to reach
Rise the purpose of measurement accuracy.
Specifically, input winding and output winding can be divided into multiple winding elements, multiple winding elements circumferentially head and the tail
Be connected complete winding, in a winding element, in the counterclockwise direction successively include excitation winding, sine windings, cosine winding,
Excitation winding, cosine winding and sine windings, or successively include in the counterclockwise direction excitation winding, cosine winding, it is sinusoidal around
Group, excitation winding, sine windings and cosine winding.
In any of the above-described technical solution, it is preferable that the length δ of the air gap meet simultaneously mechanical corner θ it is primary just
The distribution of string component is distributed with sinusoidal component three times, i.e. δ=f (cos (p θ), cos (3p θ)), wherein p is turning for rotary transformer
Sub- number of pole-pairs.
In the technical scheme, meet the once sinusoidal component of mechanical corner θ simultaneously by limiting the length δ of the air gap
Distribution is distributed with sinusoidal component three times, i.e. δ=f (cos (p θ), cos (3p θ)), is realizing the sine windings of rotary transformer
While output potential is equal with a fundamental voltage amplitude of the output potential of cosine winding, by the length for injecting the air gap
Sinusoidal component three times promotes the detection accuracy of rotor-position.
In any of the above-described technical solution, it is preferable that the coil turn of the excitation winding on each first stator tooth is identical；
The coil turn of sine windings is identical as the coil turn of cosine winding.
In the technical scheme, identical by limiting the coil turn of excitation winding on each first stator tooth, with uniform
Stator excitation is generated, so that the Rotating with Uniform of rotor is realized, by limiting the coil turn of sine windings and the line of cosine winding
Circle the number of turns is identical, and the output potential of the output potential and cosine winding that make sine windings only exists the difference in phase, to protect
The accurate measurement of rotating shaft angular travel and angular speed is demonstrate,proved.
In any of the above-described technical solution, it is preferable that the length δ of the air gap and mechanical angle θ of rotor also meet with
Lower formula:Wherein, δminFor the minimum length of the air gap, K be it is primary just
String component coefficient, k are sinusoidal component coefficient three times, 1 < K < 2,0 < k < (K-1).
In the technical scheme, by limiting specific relation formula, to realize the length of the air gap with mechanical angle
Variation and change, in conjunction with to once sinusoidal component coefficient K, the adjustment of sinusoidal component coefficient k three times, obtain injecting sinusoidal three times
The rotor profile profile of component, to achieve the purpose that promote rotation angle measurement precision.
In any of the above-described technical solution, it is preferable that δmin=0.72mm, K=1.9, k=0.09, p=2.
In the technical scheme, as a kind of preferably real-time mode, by limiting δmin=0.72mm, K=1.9, k=
0.09, p=2, to obtain specific functional relation between the length δ of the air gap and the mechanical angle θ of rotor, to facilitate reality
It applies.
As a kind of specific real-time mode, P=2, number of stator teeth 24, i.e. the salient pole type rotary transformer of 4 pole, 24 slot,
Wherein, excitation winding, sine windings, cosine winding are set gradually respectively on adjacent three teeth, circumferentially by the line of these three teeth
Circle arrangement array 8, that is, be arranged 8 magnet exciting coils, each 25 circle of coil turn, line footpathFor 0.1mm, sine windings and remaining
55 circle of each coil turn of chorded winding, line footpathFor 0.13mm, the silicon steel of DW310-35 is selected in the punching of rotary transformer
Piece, the according to prior art plan of establishment, the length δ of maximum the air gapmax=13.68mm, the minimum length of the air gap
δmin=0.72mm, the decoded rotor electrical angle error of rotary transformer are e1=± 1.05 °.
According to the rotor profile of the application, the length δ of the maximum the air gap of rotary transformermax=7.2mm, between air
The minimum length δ of gapmin=0.76mm, decoded rotor electrical angle error e 1=± 0.04 ° of rotary transformer inject three
The decoded rotor electrical angle error of the salient pole type rotary transformer of the rotor profile of secondary sinusoidal component be it is in the prior art just
The 3.81% of the decoded rotor electrical angle error of the salient pole type rotary transformer of string wave rotor shape turns to realize reduction
Sub- error.
Table 1
| θ(°) | δ 1 (mm) prior art | The technical solution of δ 2 (mm) the application |
| 0 | 0.720 | 0.756 |
| 15 | 0.769 | 0.769 |
| 30 | 0.943 | 0.888 |
| 45 | 1.368 | 1.368 |
| 60 | 2.487 | 2.974 |
| 75 | 6.202 | 6.202 |
| 90 | 13.680 | 7.200 |
| 105 | 6.202 | 6.202 |
| 120 | 2.487 | 2.974 |
| 135 | 1.368 | 1.368 |
| 150 | 0.943 | 0.888 |
| 165 | 0.769 | 0.769 |
| 180 | 0.720 | 0.756 |
| 195 | 0.769 | 0.769 |
| 210 | 0.943 | 0.888 |
| 225 | 1.368 | 1.368 |
| 240 | 2.487 | 2.974 |
| 255 | 6.202 | 6.202 |
| 270 | 13.680 | 7.200 |
| 285 | 6.202 | 6.202 |
| 300 | 2.487 | 2.974 |
| 315 | 1.368 | 1.368 |
| 330 | 0.943 | 0.888 |
| 345 | 0.769 | 0.769 |
| 360 | 0.720 | 0.756 |
As shown in Table 1, in the case where stator dimensions are same as the prior art, maximum air gap length and minimal air gap length
Between difference reduce, a fundamental wave width of the output potential of the output potential and cosine winding of the sine windings of rotary transformer
Be worth it is equal, but the detection accuracy of rotor-position promoted.
In addition, the difference between maximum air gap length and minimal air gap length can be made by the internal diameter for adjusting stator core
It is worth same as the prior art, without the number of turns for increasing output winding, can be realized the raising of output potential amplitude, while being promoted and being turned
The detection accuracy of sub- position.
In any of the above-described technical solution, it is preferable that rotor core is configured to salient pole type structure according to rotor number of pole-pairs, with
Change the length δ of the air gap circumferentially with mechanical rotational angle theta.
In any of the above-described technical solution, it is preferable that offer limiting slot on the inner sidewall of the axis hole of rotor core；Rotor
The limit rib with limiting slot cooperation is provided on the lateral wall of the shaft of iron core.
In any of the above-described technical solution, it is preferable that the integral multiple that the quantity of stator tooth is 12.
In any of the above-described technical solution, it is preferable that stator core is by multiple silicon steel sheets along the axis of the shaft of rotor core
It is formed to superimposed structure；Axially stacking construction of the rotor core by multiple silicon steel sheets along the shaft of rotor core is formed.Wherein, turn
The both ends end face of sub- iron core protrudes from the both ends end face setting of stator core along axial direction respectively.
The one or more technical solutions provided in technical scheme, have at least the following technical effects or advantages:
By the way that the length δ of the air gap is set as circumferentially meeting with the mechanical corner θ of rotor comprising triple-frequency harmonics point
The SIN function relationship of amount injects triple-frequency harmonics to realize to the air gap of rotary transformer, to weaken output end output electricity
The triple-frequency harmonics of gesture is surveyed so as to reduce the measurement error of magnetoresistance transformer with improving the position of rotary transformer
Accuracy of measurement.
The additional aspect and advantage of the utility model will become obviously in following description section, or practical new by this
The practice of type is recognized.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the utility model from the description of the embodiment in conjunction with the following figures will
Become obvious and be readily appreciated that, in which:
Fig. 1 shows the cross section structure schematic diagram of the rotor of rotary transformer in the related technology；
Fig. 2 shows the signals of the cross section structure of the rotor of the rotary transformer of one embodiment according to the present utility model
Figure；
Fig. 3 shows the structural schematic diagram of the rotary transformer of one embodiment according to the present utility model.
Wherein, the corresponding relationship in Fig. 2 and Fig. 3 between appended drawing reference and component names are as follows:
1 rotary transformer, 10 stators, 102 stator cores, 104 excitation windings, 106 sine windings, 108 cosine windings,
20 rotors.
Specific embodiment
In order to be more clearly understood that the above objects, features, and advantages of the utility model, with reference to the accompanying drawing and have
The utility model is further described in detail in body embodiment.It should be noted that in the absence of conflict, this Shen
The feature in embodiment and embodiment please can be combined with each other.
Many details are explained in the following description in order to fully understand the utility model, still, this is practical
Novel to be implemented using other than the one described here other modes, therefore, the protection scope of the utility model is simultaneously
It is not limited by the specific embodiments disclosed below.
The rotary transformer according to some embodiments of the utility model is described referring to Fig. 2 and Fig. 3.
As shown in Figure 2 and Figure 3, the rotary transformer of embodiment according to the present utility model, comprising: stator 10, including it is fixed
Sub- iron core 102 and the input winding being wound around on stator core 102 and output winding are opened on the inner sidewall of stator core 102
If multiple stator slots, multiple stator slots are circumferentially distributed, and are respectively connected two end faces of stator core 102, make any two
Stator tooth is formed between a adjacent stator slot, rotating around sub 10 slots of setting；Rotor 20, including rotor core, rotor core
It is set in stator core；Wherein, it is limited between the inner sidewall of stator core 102 and the lateral wall of rotor core between air
Gap, when rotor 20 rotates, the length δ (i.e. gas length) of the air gap, which circumferentially meets with the mechanical corner θ of rotor 20, to be wrapped
SIN function relationship containing third-harmonic component, and periodically-varied is executed according to functional relation, to limit rotor core
Shape.
In this embodiment, rotary transformer 1 be magnetoresistance transformer, will input winding (excitation winding 104) with
Output winding (including sine windings 106 and cosine winding 108) is wound around determining for stator core 102 according to specified winding mode
On sub- tooth, realize that stator 10 motivates by excitation winding 104, by sine windings 106 and the output of cosine winding 108 and rotor 20
Mechanical corner θ formed special function relationship variable signal, by by the length δ of the air gap be set as circumferentially with rotor
20 mechanical corner θ meets the SIN function relationship comprising third-harmonic component, to realize to the air gap of rotary transformer
Triple-frequency harmonics is injected, to weaken the triple-frequency harmonics of output end output potential, so as to reduce the survey of magnetoresistance transformer
Error is measured, to improve the positional accuracy measurement of rotary transformer.
Since rotary transformer ensure that the magnetic flux distribution symbol when rotor 20 rotates a circle, in the air gap in structure
Sinusoidal rule is closed, by the way that 20 shape of rotor is done special designing, so that air-gap field is similar to sinusoidal, while being turned by improving
Sub 20 shapes realize injection sinusoidal component three times, compared with the existing technology in sinusoidal, by injecting sinusoidal component three times,
The difference between maximum air gap length and minimal air gap length can be reduced, realizing that the triple-frequency harmonics reduced in measurement process is dry
While disturbing, it still is able to identical output potential.
According to foregoing description, those skilled in the art is also understood that, as shown in Fig. 2, using in the application
20 structure of rotor, in the case that difference between maximum air gap length and minimal air gap length reduces, stator tooth quantity not
Become, and under the premise of umber of turn is constant, the potential of output and shown in fig. 1 uses 20 structure output of rotor in the prior art
Potential it is identical, to not reduce maximum air gap length and minimal air gap while using 20 structure of rotor in the application
Difference between length may also reach up the purpose for improving output potential while improving 20 position detection accuracy of rotor, from
And it is able to ascend the operational efficiency of rotary transformer.
In addition, transformer rotor 20 in the prior art is by increasing maximum air gap in order to generate biggish output signal
Difference is realized between minimal air gap, so as to cause 20 outer dimension change rate of rotor big, is machined essence for rotor 20
It spends more demanding, according to the rotor 20 of the technical solution of the application, passes through injection triple-frequency harmonics, additionally it is possible to reduce the processing of rotor 20
Difficulty.
In the above embodiment, it is preferable that input winding includes excitation winding 104；Exporting winding includes sine windings 106
With cosine winding 108, wherein between two excitation windings 104 of arbitrary neighborhood interval setting two stator tooths, with rotating around
If sine windings 106 and cosine winding 108.
In this embodiment, by being spaced two stator tooths of setting between two excitation windings 104 of arbitrary neighborhood, with
Winding sine windings 106 and cosine winding 108 respectively, so that excitation winding 104, sine windings 106 and cosine winding 108 are along week
To being spaced apart, stator excitation is realized in conjunction with by excitation winding 104, and by sine windings 106 and the output of cosine winding 108 and turn
The mechanical corner θ of son forms the variable signal of special function relationship, when injecting triple-frequency harmonics to the air gap, realizes raising
The positional accuracy measurement of rotary transformer 1.
Specifically, stator tooth includes the first stator tooth for winding excitation winding 104, and the of winding sine windings 106
The third stator tooth of two stator tooths and winding cosine winding 108, wherein have between two the first stator tooths of arbitrary neighborhood
One the second stator tooth and a third stator tooth.
In any of the above-described embodiment, it is preferable that a two sides winding in two excitation windings 104 of arbitrary neighborhood is just
Chorded winding 106, another two sides winding cosine winding 108.
In this embodiment, circumferentially distributed multiple stator tooths can be divided into first by the winding different according to winding
Stator tooth, the second stator tooth and third stator tooth, the first stator tooth, the second stator tooth are identical as the quantity of third stator tooth, with
Winding is used for the excitation winding 104 of signal input, and the sine windings 106 and cosine winding 108 that export for signal respectively,
Wherein, the first adjacent stator tooth, the second stator tooth and third stator tooth are one group of winding tooth, then circumferentially distributed multiple stators
Tooth is made of multiple groups winding tooth, to realize the regular winding of magnetoresistance transformer, in conjunction with the injection of sinusoidal component three times, with
Achieve the purpose that improving measurement accuracy.
As shown in figure 3, specifically, input winding and output winding can be divided into multiple winding elements, multiple winding elements
It circumferentially joins end to end and completes winding, in the counterclockwise direction successively include excitation winding 104, sinusoidal in a winding element
Winding 106, cosine winding 108, excitation winding 104, cosine winding 108 and sine windings 106, or in the counterclockwise direction according to
Secondary includes excitation winding 104, cosine winding 108, sine windings 106, excitation winding 104, sine windings 106 and cosine winding
108。
In any of the above-described embodiment, it is preferable that the length δ of the air gap meets the once sinusoidal of mechanical corner θ simultaneously
Component distribution is distributed with sinusoidal component three times, i.e. δ=f (cos (p θ), cos (3p θ)), wherein p is turning for rotary transformer 1
Sub 20 numbers of pole-pairs, θ are the mechanical corner of rotor 20.
In this embodiment, meet the once sinusoidal component point of mechanical corner θ simultaneously by limiting the length δ of the air gap
Cloth is distributed with sinusoidal component three times, i.e. δ=f (cos (p θ), cos (3p θ)), in the sine windings 106 for realizing rotary transformer 1
Output potential it is with a fundamental voltage amplitude of the output potential of cosine winding 108 equal while, pass through injection the air gap
The sinusoidal component three times of length promotes the detection accuracy of 20 position of rotor.
In any of the above-described embodiment, it is preferable that the coil turn phase of the excitation winding 104 on each first stator tooth
Together；The coil turn of sine windings 106 is identical as the coil turn of cosine winding 108.
In this embodiment, identical by limiting the coil turn of excitation winding 104 on each first stator tooth, with uniform
Stator 10 is generated to motivate, to realize the Rotating with Uniform of rotor 20, by limit sine windings 106 coil turn and cosine around
The coil turn of group 108 is identical, and the output potential of the output potential and cosine winding 108 that make sine windings 106 only exists phase
On difference, to ensure that the accurate measurement of rotating shaft angular travel and angular speed.
In any of the above-described embodiment, it is preferable that the length δ of the air gap and the mechanical angle θ of rotor 20 also meet with
Lower formula:Wherein, δminFor the minimum length of the air gap, K be it is primary just
String component coefficient, k are sinusoidal component coefficient three times, 1 < K < 2,0 < k < (K-1).
In this embodiment, by limiting specific relation formula, to realize the length of the air gap with mechanical angle
Variation and change, in conjunction with to once sinusoidal component coefficient K, the adjustment of sinusoidal component coefficient k three times, obtain injecting sinusoidal three times divide
20 appearance profile of rotor of amount, to achieve the purpose that promote rotation angle measurement precision.
In any of the above-described embodiment, it is preferable that δmin=0.72mm, K=1.9, k=0.09, p=2.
In this embodiment, as a kind of preferably real-time mode, by limiting δmin=0.72mm, K=1.9, k=
0.09, p=2, to obtain specific functional relation between the length δ of the air gap and the mechanical angle θ of rotor 20, thus convenient
Implement.
As a kind of specific real-time mode, P=2, number of stator teeth 24, i.e. the salient pole type rotary transformer of 4 pole, 24 slot,
Wherein, excitation winding 104, sine windings 106, cosine winding 108 are set gradually respectively on adjacent three teeth, circumferentially by this three
8 magnet exciting coils, each 25 circle of coil turn, line footpath is arranged in the coil configuration array of a tooth 8For 0.1mm, it is sinusoidal around
55 circle of each coil turn of group 106 and cosine winding 108, line footpathPunching for 0.13mm, rotary transformer is selected
The silicon steel sheet of DW310-35.
As shown in Figure 1, the plan of establishment according to prior art, rotor core largest contours are minimum having a size of 98.56mm
Profile gear is 72.64mm, the length δ of maximum the air gapmax=13.68mm, the minimum length δ of the air gapmin=
0.72mm, the decoded 20 electrical angle error of rotor of rotary transformer are e1=± 1.05 °.
According to the rotor profile of the application, rotor core largest contours are having a size of 98.48mm, minimized profile gear
85.6mm, the length δ of the maximum the air gap of rotary transformermax=7.2mm, the minimum length δ of the air gapmin=
0.76mm, decoded 20 electrical angle error e 1=± 0.04 ° of rotor of rotary transformer, that is, inject the rotor of sinusoidal component three times
The decoded 20 electrical angle error of rotor of the salient pole type rotary transformer of 20 shapes is outside sinusoidal wave rotor 20 in the prior art
The 3.81% of the decoded 20 electrical angle error of rotor of the salient pole type rotary transformer of shape misses to realize and reduce rotor 20
Difference.
As shown in Figure 1, the salient pole type rotary transformer of the length of the air gap in the prior art circumferentially Sine distribution
Rotor profile, wherein diameter of stator boreMinimal air gap length δmin=0.72mm, gas length is circumferentially
Formula is as follows:
Wherein, 1 < K < 2, in the embodiment, K=1.9.
The number of pole-pairs of p --- field spider, in this embodiment, p=2, i.e. rotor include 2 pairs of magnetic poles.
The mechanical angle that the length of θ --- the air gap circumferentially rotates.
Fig. 2 shows the rotor profile for injecting the salient pole type rotary transformer of sinusoidal component three times, the length of the air gap
Formula circumferentially is as follows:
Wherein,0 < k < (K-1), k are the positive number greater than 0, the embodiment
In, k=0.09.
Table 1
| θ(°) | δ 1 (mm) prior art | δ 2 (mm) embodiments herein |
| 0 | 0.720 | 0.756 |
| 15 | 0.769 | 0.769 |
| 30 | 0.943 | 0.888 |
| 45 | 1.368 | 1.368 |
| 60 | 2.487 | 2.974 |
| 75 | 6.202 | 6.202 |
| 90 | 13.680 | 7.200 |
| 105 | 6.202 | 6.202 |
| 120 | 2.487 | 2.974 |
| 135 | 1.368 | 1.368 |
| 150 | 0.943 | 0.888 |
| 165 | 0.769 | 0.769 |
| 180 | 0.720 | 0.756 |
| 195 | 0.769 | 0.769 |
| 210 | 0.943 | 0.888 |
| 225 | 1.368 | 1.368 |
| 240 | 2.487 | 2.974 |
| 255 | 6.202 | 6.202 |
| 270 | 13.680 | 7.200 |
| 285 | 6.202 | 6.202 |
| 300 | 2.487 | 2.974 |
| 315 | 1.368 | 1.368 |
| 330 | 0.943 | 0.888 |
| 345 | 0.769 | 0.769 |
| 360 | 0.720 | 0.756 |
As shown in Table 1, in the case where 10 size of stator is same as the prior art, maximum air gap length and minimal air gap are long
Difference between degree reduces, the output potential of the output potential and cosine winding 108 of the sine windings 106 of rotary transformer 1
One time fundamental voltage amplitude is equal, but the detection accuracy of 20 position of rotor is promoted.
In addition, can be made between maximum air gap length and minimal air gap length by the internal diameter for adjusting stator core 102
Difference is same as the prior art, without the number of turns for increasing output winding, the raising of output potential amplitude can be realized, promoted simultaneously
The detection accuracy of 20 position of rotor.
In any of the above-described embodiment, it is preferable that rotor core is configured to salient pole type structure according to 20 number of pole-pairs of rotor, with
Change the length δ of the air gap circumferentially with mechanical rotational angle theta.
In any of the above-described embodiment, it is preferable that offer limiting slot on the inner sidewall of the axis hole of rotor core；Rotor iron
The limit rib with limiting slot cooperation is provided on the lateral wall of the shaft of core.
In any of the above-described embodiment, it is preferable that the integral multiple that the quantity of stator tooth is 12.
In any of the above-described embodiment, it is preferable that stator core 102 is by multiple silicon steel sheets along the axis of the shaft of rotor core
It is formed to superimposed structure；Axially stacking construction of the rotor core by multiple silicon steel sheets along the shaft of rotor core is formed.Wherein, turn
The both ends end face of sub- iron core protrudes from the both ends end face setting of stator core 102 along axial direction respectively.
Technical solution according to the present utility model, rotary transformer are magnetoresistance transformer, by excitation winding with it is defeated
Winding (including sine windings and cosine winding) is wound around on the stator tooth of stator core according to specified winding mode out, is passed through
Excitation winding realizes stator excitation, to form special function by sine windings and the output of cosine winding and the mechanical corner θ of rotor
The variable signal of relationship, by the way that the length δ of the air gap to be set as circumferentially meeting with the mechanical corner θ of rotor comprising three times
The SIN function relationship of harmonic component injects triple-frequency harmonics to realize to the air gap of rotary transformer, to weaken output end
The triple-frequency harmonics of output potential, so as to reduce the measurement error of magnetoresistance transformer, to improve rotary transformer
Positional accuracy measurement.
In the present invention, term " first ", " second ", " third " are only used for the purpose of description, and should not be understood as
Indication or suggestion relative importance；Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " peace
Dress ", " connected ", " connection ", the terms such as " fixation " shall be understood in a broad sense, can also be with for example, " connection " may be a fixed connection
It is to be detachably connected, or be integrally connected；" connected " can be directly connected, can also be indirectly connected through an intermediary.It is right
For those skilled in the art, can understand as the case may be above-mentioned term in the present invention specifically contain
Justice.
In the description of the utility model, it is to be understood that term " on ", "lower", "left", "right", "front", "rear" etc. refer to
The orientation or positional relationship shown be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description the utility model and
Simplify description, rather than the device or unit of indication or suggestion meaning there must be specific direction, with specific orientation construction
And operation, it is thus impossible to be construed as a limitation of the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least the one of the utility model
In a embodiment or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment
Or example.Moreover, the particular features, structures, materials, or characteristics of description can be in any one or more embodiment or examples
In can be combined in any suitable manner.
The above is only the preferred embodiments of the utility model, are not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of rotary transformer characterized by comprising
Stator, including stator core and the input winding being wound around on the stator core and output winding, the stator iron
Multiple stator slots are opened up on the inner sidewall of core, the multiple stator slot is circumferentially distributed, and makes the two of the stator core respectively
A end face conducting, so as to stator tooth be formed between the adjacent stator slot of any two, to input winding described in winding respectively
With the output winding；
Rotor, including rotor core, the rotor core are set in the stator core；
Wherein, the air gap is limited between the inner sidewall of the stator core and the lateral wall of the rotor core, described
When rotor rotates, it includes third-harmonic component that the length δ of the air gap, which circumferentially meets with the mechanical corner θ of the rotor,
SIN function relationship, and according to the functional relation execute periodically-varied, to limit the shape of the rotor core.
2. rotary transformer according to claim 1, which is characterized in that
The input winding includes excitation winding；
The output winding includes sine windings and cosine winding,
Wherein, two stator tooths of interval setting between two excitation windings of arbitrary neighborhood, with winding institute respectively
State sine windings and the cosine winding.
3. rotary transformer according to claim 2, which is characterized in that
Sine windings described in a two sides winding in two excitation windings of arbitrary neighborhood, described in another two sides winding
Cosine winding.
4. rotary transformer according to claim 3, which is characterized in that
The length δ of the air gap meet simultaneously the once sinusoidal component distribution of the mechanical corner θ of the rotor with three times just
The distribution of string component, i.e. δ=f (cos (p θ), cos (3p θ)),
Wherein, p is the rotor number of pole-pairs of the rotary transformer.
5. rotary transformer according to claim 3, which is characterized in that
The coil turn of the excitation winding on each stator tooth is identical；
The coil turn of the sine windings is identical as the coil turn of the cosine winding.
6. rotary transformer according to claim 4, which is characterized in that the length δ and the rotor of the air gap
Mechanical angle θ also meet following formula:
Wherein, δminFor the minimum length of the air gap, K is once sinusoidal component coefficient, and k is sinusoidal component coefficient three times,
1 < K < 2,0 < k < (K-1).
7. rotary transformer according to claim 6, which is characterized in that
δmin=0.72mm, K=1.9, k=0.09, p=2.
8. rotary transformer according to claim 1, which is characterized in that
Limiting slot is offered on the inner sidewall of the axis hole of the rotor core.
9. rotary transformer according to claim 1, which is characterized in that
The integral multiple that the quantity of the stator tooth is 12.
10. rotary transformer according to any one of claim 1 to 9, which is characterized in that
Axially stacking construction of the stator core by multiple silicon steel sheets along the shaft of the rotor core is formed；
Axially stacking construction of the rotor core by multiple silicon steel sheets along the shaft of the rotor core is formed,
Wherein, the both ends end face of the rotor core protrudes from the both ends end face setting of the stator core along axial direction respectively.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821022202.6U CN208608878U (en) | 2018-06-29 | 2018-06-29 | Rotary transformer |
| JP2021518842A JP7087199B2 (en) | 2018-06-29 | 2019-06-27 | Rotary transformer |
| PCT/CN2019/093345 WO2020001552A1 (en) | 2018-06-29 | 2019-06-27 | Rotary transformer |
| EP19826357.6A EP3799277A4 (en) | 2018-06-29 | 2019-06-27 | Rotary transformer |
| US17/119,186 US11578998B2 (en) | 2018-06-29 | 2020-12-11 | Rotary transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821022202.6U CN208608878U (en) | 2018-06-29 | 2018-06-29 | Rotary transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208608878U true CN208608878U (en) | 2019-03-15 |
Family
ID=65667308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821022202.6U Active CN208608878U (en) | 2018-06-29 | 2018-06-29 | Rotary transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208608878U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020001552A1 (en) * | 2018-06-29 | 2020-01-02 | 广东威灵汽车部件有限公司 | Rotary transformer |
-
2018
- 2018-06-29 CN CN201821022202.6U patent/CN208608878U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020001552A1 (en) * | 2018-06-29 | 2020-01-02 | 广东威灵汽车部件有限公司 | Rotary transformer |
| US11578998B2 (en) | 2018-06-29 | 2023-02-14 | Guangdong Welling Auto Parts Co., Ltd. | Rotary transformer |
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| TR01 | Transfer of patent right |
Effective date of registration: 20190520 Address after: 528311 Building No. 21 Gangqian Road, Industrial Park, Beijiao Town, Shunde District, Foshan City, Guangdong Province Patentee after: Guangdong Welling Automobile Parts Co., Ltd. Address before: 528311 fifteen sixteen seventeen districts, Beijiao Town Industrial Park, Shunde District, Guangdong, Foshan Co-patentee before: Midea Welling Electric Motor Technology (Shanghai) Co., Ltd. Patentee before: Guangdong Welling Electric Machine Manufacture Co., Ltd. |
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| TR01 | Transfer of patent right |