CN112289571A - Rotor linear half-wave axial magnetic circuit reluctance type rotary transformer - Google Patents

Rotor linear half-wave axial magnetic circuit reluctance type rotary transformer Download PDF

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Publication number
CN112289571A
CN112289571A CN202011119904.8A CN202011119904A CN112289571A CN 112289571 A CN112289571 A CN 112289571A CN 202011119904 A CN202011119904 A CN 202011119904A CN 112289571 A CN112289571 A CN 112289571A
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rotor
wave
magnetic conduction
stator
silicon steel
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尚静
冉晓贺
杨玉磊
赵猛
刘承军
胡建辉
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/18—Rotary transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

A rotor linear half-wave axial magnetic circuit reluctance type rotary transformer relates to a rotary transformer. The outer wall of the rotor is fixedly provided with a cosine signal winding, the inner wall of the stator is fixedly provided with an excitation winding and a sine signal winding, the rotor is arranged in the stator, an air gap is reserved between the rotor and the stator, the rotor is a half-wave rotor and comprises a half-wave magnetic conduction band and a non-magnetic conduction material base, the half-wave magnetic conduction band is a linear magnetic conduction band made of magnetic conduction materials, silicon steel sheets are selected as the magnetic conduction materials, the non-magnetic conduction material base adopts an aluminum base, the outer side wall of the aluminum base is provided with a plurality of wedge-shaped grooves, and a plurality of silicon. The half-wave linear magnetic guide belt is used as a pair of magnetic circuits, so that the space of the rotary transformer with the same number of pole pairs can be saved, and the half-wave rotor is stacked in the wedge-shaped groove on the outer side wall of the aluminum base along a straight line through a silicon steel sheet, so that the processing technology can be greatly simplified, and the batch processing is facilitated.

Description

Rotor linear half-wave axial magnetic circuit reluctance type rotary transformer
Technical Field
The invention relates to a rotary transformer, in particular to a rotor linear half-wave axial magnetic circuit reluctance type rotary transformer, and belongs to the technical field of electromechanics.
Background
The reluctance type rotary transformer is a rotary transformer which utilizes the variation of air gap reluctance to output signal variation, and is an angle sensing element which utilizes the variation of air gap and reluctance to make the induced voltage of an output winding perform corresponding sine or cosine variation at a mechanical corner according to the electromagnetic induction principle.
Most of the existing reluctance type rotary transformers are full-wave sine rotor magnetic conduction wave band reluctance type rotary transformers, on one hand, the occupied rotor space is large, on the other hand, the sine full-wave magnetic conduction band needs integral powder metallurgy compression molding, the requirement on a mold is extremely high, the structure of the full-wave sine rotor magnetic conduction wave band is shown in figure 1 in the attached drawing of the specification, and the processing technology of the full-wave rotor is complex.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a rotor linear half-wave axial magnetic circuit reluctance type rotary transformer, which adopts a half-wave magnetic conduction band as a pair of magnetic circuits, can save the space of the rotary transformer with the same number of pole pairs, and the half-wave rotor is linearly stacked in a wedge-shaped groove on the outer side wall of an aluminum base through a silicon steel sheet, thereby greatly simplifying the processing technology and facilitating the batch processing.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a rotor linear half-wave axial magnetic circuit reluctance type resolver, includes rotor, stator, sinusoidal signal winding, cosine signal winding and excitation winding, rotor outer wall fixed mounting has cosine signal winding, stator inner wall fixed mounting has excitation winding and sinusoidal signal winding, and the rotor sets up leaves the air gap in the stator between the two, and the rotor is the half-wave rotor, the half-wave rotor comprises half-wave magnetic conduction band and non-magnetic conduction material base, the half-wave magnetic conduction band is the straight line magnetic conduction band that adopts magnetic conduction material to make, and magnetic conduction material selects the silicon steel sheet, non-magnetic conduction material base adopts aluminium base, and the equal angle milling process of aluminium base lateral wall along its circumference has many inclined wedge grooves, and the shape and the wedge groove cross-section of silicon steel sheet are the same, stacks a plurality of silicon steel sheet in order in every wedge groove and constitutes half-wave.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the half-wave guide magnetic tape as a pair of magnetic circuits, can save the rotor space for multi-pair magnetic resistance type rotary transformer, can arrange more pairs of magnetic poles of the rotor in a limited space, and the half-wave rotor has simple structure, the half-wave rotor consists of a half-wave magnetic conduction band and a non-magnetic conduction material base, the non-magnetic conduction material base adopts an aluminum base and is milled and processed with a plurality of inclined wedge-shaped grooves along the circumferential direction at equal angles on the outer side wall, the half-wave guide magnetic tape is composed of silicon steel sheets and is stacked in the wedge-shaped grooves along a straight line, the silicon steel sheets are not easy to slide out from the notches of the wedge-shaped grooves, the processing technique can be greatly simplified, the processing technique is convenient for batch processing, when the excitation winding is electrified with constant voltage alternating current, the sine signal winding and the cosine signal winding respectively output the voltage with the electromotive force amplitude, the error caused by installation eccentricity and the like can be greatly eliminated.
Drawings
FIG. 1 is a block diagram of a full wave rotor;
fig. 2 is a structural view of a half-wave rotor of the present invention;
FIG. 3 is a partial block diagram of the wedge groove of the aluminum base of the present invention;
fig. 4 is a structural view of a silicon steel sheet of the present invention;
FIG. 5 is a view showing an assembly structure of a silicon steel sheet and an aluminum base according to the present invention;
FIG. 6 is an overall block diagram of the present invention;
FIG. 7 is a schematic diagram of the variable reluctance of the embodiment;
FIG. 8 is a plot of the actual coupling area versus the fitted sinusoid function for the examples.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 2 to 6, the invention discloses a rotor linear half-wave axial magnetic circuit reluctance type rotary transformer, which comprises a half-wave rotor 1 and a stator 2, wherein the outer surface of the half-wave rotor 1 is smooth and is composed of a half-wave magnetic conduction band and a non-magnetic conduction material base, which is a core improvement point of the invention, as shown in fig. 2, different from the conventional structure rotary transformer, the half-wave magnetic conduction band is a linear magnetic conduction band made of magnetic conduction material, the magnetic conduction material is selected from silicon steel sheets 3, the non-magnetic conduction material base adopts an aluminum base 4, the aluminum base 4 is circular, the outer side wall of the base is milled and processed with a plurality of inclined wedge-shaped grooves 5 at equal angles along the circumferential direction, as shown in fig. 3, the shape of the silicon steel sheets 3 is the same as the cross section of the wedge-shaped grooves 5, as shown in fig. 4, a plurality of silicon steel sheets, after the silicon steel sheets 3 are stacked, glue is sealed at two ends of the wedge-shaped groove 5, as shown in fig. 5, by adopting the structure of the silicon steel sheets 3, the iron loss can be reduced, the precision of the rotary transformation is improved, the cosine signal winding 6 is fixedly arranged on the outer wall of the half-wave rotor 1, an excitation winding 7 and a sine signal winding 8 are fixedly installed on the inner wall of the stator 2, the half-wave rotor 1 is arranged in the stator 2, an air gap is reserved between the excitation winding 7 and the sine signal winding, and the rotary transformer is integrally assembled.
Rotor linear half-wave axial magnetic circuit reluctance type rotary transformerThe voltage transformer consists of a stator 2 and a half-wave rotor 1, air gaps between the stator and the half-wave rotor are uniformly distributed, the half-wave rotor 1 consists of two parts, namely a magnetic conductive material and a non-magnetic conductive material, in order to enable the signal output amplitude to be as large as possible, the thickness of the magnetic conductive part of the half-wave rotor 1 is required to be equal to the axial length of the teeth on the stator, therefore, the structure of the half-wave rotor 1 can enable the air gap magnetic conductance to change along with the change of a rotor corner, when the rotor corner is changed from 0 to 2 pi, the magnetic conductive part of the half-wave rotor 1 rotates for P sine periods, and the induced potential in a two. Therefore, P is the number of pole pairs of the single-channel axial magnetic circuit resolver, and as can be seen from the axial structure of the half-wave rotor 1, the number of pole pairs does not affect the volume of the single-channel axial magnetic circuit reluctance resolver (ARR), so that the angle measurement accuracy can be improved by increasing the number of pole pairs under the condition that the size of the stator 2 allows. The stator 2 is provided with Z inside0A central slot is formed along the circumferential direction of the same tooth slot, so that the inner surface of the stator 2 forms a Z shape0To upper tooth and lower tooth, wherein: the axial length of the upper teeth of the stator, the axial length of the lower teeth of the stator and the axial length of the middle slot are equal, and the excitation winding 7 is an annular concentrated winding which is embedded in the middle slot and is arranged concentrically with the stator 2.
Because the volume of the rotary transformer is limited, the number of slots of the stator 2 can not be infinitely increased along with the increase of the number of pole pairs, therefore, in the multi-pair pole rotary transformer, the stator 2 generally adopts fractional slot sinusoidal winding, and the number of stator teeth Z issThe value cannot be too small, otherwise, the signal winding cannot be smoothly wound on the stator teeth to form sine and cosine signals with specified number of pole pairs, and the selection of the stator teeth under different number of pole pairs generally meets the following tooth space matching rule:
when the number of pole pairs is chosen to be odd:
ZS≥2P+2
when the number of pole pairs is chosen as an even number:
ZS≥2P+1
wherein, under the condition of determining the pole pair number, when the following slot numbers are selected for matching, as shown in Table 1, the offset number of conductors in the slot is relatively less, the utilization rate of the winding is higher, the use can be considered preferentially,
TABLE 1 polar slot fitting relationship of minimum counteracting turns under different pole pair numbers
Figure BDA0002731618430000041
Modeling and precision analysis are carried out on the multi-pole rotary transformer, a stator and a rotor are generally matched by adopting a near slot, each phase signal winding is divided into 2P groups, the winding directions of any two adjacent groups of windings are opposite, N stator teeth are wound at intervals, the arrangement modes of two phase signal windings are the same, and the phase difference is 90 electrical angles.
The calculation formula of the number of conductors in each slot is as follows:
Figure BDA0002731618430000051
Figure BDA0002731618430000052
in the formula:
NSithe effective number of turns (turns) of the winding in the ith slot of the sine signal winding adopting a sine mode;
NCithe effective number of turns (turns) of the winding in the ith slot of the sine-type cosine signal winding is adopted;
Nmthe amplitude (turns) of the signal winding function in the sinusoidal winding mode;
p is the number of pole pairs of the rotor;
αris the initial angle of the winding to the axis.
The reluctance type rotary transformer with 8 poles and 20 slots is used as an example, the designed winding turns circulate every five teeth, two sine waves can be fitted by the winding turns in every five slots, the rotary transformer with the 8 poles and 20 slots structure is adopted, theoretically, the reluctance type rotary transformer is equivalent to the two pairs of poles of 5 slots, and the turn design can be adopted on the premise that the pole-slot ratio is not changed. In addition, better pole slot fit may occur with increasing pole pair numbers, such as 64:72 for 32 pole pairs, etc.
Different from the structure of a radial reluctance type rotary transformer, magnetic circuits of a linear half-wave axial rotary transformer are distributed along the axial direction, the length of an air gap between a stator and a rotor is kept unchanged along the circumferential direction, and the axial coupling length is closely related to the structure of the rotor. Since the inductances of the different windings are caused by the respective flux linkages, the direction of the flux linkages will be the determining factor for determining the axial coupling length l. For the mutual inductance between the excitation winding and the signal winding, flux linkage generated by the excitation winding flows into the rotor from the upper teeth of the stator through the air gap, then flows into the air gap from the rotor, flows into the lower teeth of the stator through the air gap, and finally flows through the yoke part of the stator to return to the upper teeth of the stator to form a flux linkage closed loop. Therefore, the flux linkage flow directions of the upper teeth and the lower teeth of the stator are opposite.
Example (b): the P-pair-pole axial magnetic circuit reluctance type rotary transformer (ARR) adopts a half-wave rotor 1, the coupling area S of the half-wave rotor 1 and a stator tooth is periodically changed for P times every time a mechanical period is rotated, the S change situation is deduced by taking an 8-pole 20-slot as an example, the coupling process of an upper tooth of a stator and a silicon steel sheet 3 of the half-wave rotor 1 is shown in a figure 7, the coupling area of the half-wave rotor 1 and one tooth of a stator 2 is the difference of the coupling areas of the half-wave rotor 1, the upper tooth of the stator and a lower tooth of the stator, and the coupling area of the half-wave rotor 1 and the upper tooth of the stator isupAnd the coupling area with the lower teeth of the stator is SdownThe total coupling area with one tooth of the stator 2 is S ═ Sup-SdownThe axial lengths of the upper teeth, the middle slots and the lower teeth of the stator are equal, the time when the coupling length between the stator teeth 1 and the half-wave rotor 1 in fig. 7 occurs is the initial time of the rotor, (the time when the Z axis coincides with the side line of the stator teeth 1 in the figure), at this time θ is 0, and when the half-wave rotor 1 and the stator 2 move relatively, assuming that the half-wave rotor 1 rotates by an angle θ, the stator-rotor coupling length l (θ) can be expressed as:
Figure BDA0002731618430000061
wherein: r is1The inner diameter of the stator, k is a natural number, and alpha is an inclination angle between the wedge-shaped groove and a horizontal line;
because the magnetic density directions of the upper stator teeth and the lower stator teeth in the actual model are opposite, the coupling area of the upper stator teeth and the lower stator teeth in the same pair can be expressed as follows:
Figure BDA0002731618430000071
wherein: b is the width of the stator teeth, P is the number of the rotor pole pairs, K1＝r1 2Tan θ, derived from the equation1And the amplitude of the function and other factors are related, and the function fitting is carried out:
Figure BDA0002731618430000072
wherein:
Figure BDA0002731618430000073
is a constant number of times, and is,
Figure BDA0002731618430000074
the comparison between the fitting function and the calculated coupling area is a fixed value as shown in fig. 8, and it can be seen from the figure that, in an ideal state, the magnetic flux changes sinusoidally with the rotation angle, and the precision is high.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (2)

1. The utility model provides a rotor linear half-wave axial magnetic circuit reluctance type rotary transformer, includes rotor, stator, sine signal winding, cosine signal winding and excitation winding, rotor outer wall fixed mounting has cosine signal winding, stator inner wall fixed mounting has excitation winding and sine signal winding, and the rotor setting leaves the air gap, its characterized in that in the stator between its the two: the rotor is a half-wave rotor, the half-wave rotor is composed of a half-wave magnetic conduction band and a non-magnetic conduction material base, the half-wave magnetic conduction band is a linear magnetic conduction band made of magnetic conduction materials, silicon steel sheets are selected as the magnetic conduction materials, the non-magnetic conduction material base is an aluminum base, a plurality of inclined wedge-shaped grooves are milled on the outer side wall of the aluminum base at equal angles along the circumferential direction of the aluminum base, the shapes of the silicon steel sheets are the same as the sections of the wedge-shaped grooves, and a plurality of silicon steel sheets are stacked in each wedge-.
2. The rotor linear half-wave axial magnetic circuit reluctance type resolver according to claim 1, wherein: glue sealing is carried out on two ends of the wedge-shaped groove after the silicon steel sheets are stacked, so that the silicon steel sheets are prevented from being separated.
CN202011119904.8A 2020-10-19 2020-10-19 Rotor linear half-wave axial magnetic circuit reluctance type rotary transformer Pending CN112289571A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201018327Y (en) * 2007-02-13 2008-02-06 西安微电机研究所 Magnetic resistance type multipole rotary transformer
CN201294414Y (en) * 2008-11-10 2009-08-19 陈向阳 Permanent magnet generator rotor
CN102082473A (en) * 2010-12-15 2011-06-01 杭州富宁电器有限公司 Structure and processing technology of rotor of servo motor
CN103617880A (en) * 2013-12-10 2014-03-05 哈尔滨工业大学 Outer rotor axial magnetic circuit multi-pole reluctance type rotary transformer with redundant winding
CN104200969A (en) * 2014-09-17 2014-12-10 哈尔滨工业大学 Single-layer signal winding axial magnetic path multi-polar resolver and coil winding method
CN104200976A (en) * 2014-09-17 2014-12-10 哈尔滨工业大学 Harmonic-wave eliminating type axial magnetic circuit monopolar rotary transformer and winding method of signal windings
CN109617354A (en) * 2019-02-03 2019-04-12 哈尔滨工业大学 Rotor half-sinusoid axial magnetic circuit VR Two Speed Resolver
CN109698594A (en) * 2019-02-03 2019-04-30 哈尔滨工业大学 The linear half-wave axial magnetic circuit VR Two Speed Resolver of rotor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201018327Y (en) * 2007-02-13 2008-02-06 西安微电机研究所 Magnetic resistance type multipole rotary transformer
CN201294414Y (en) * 2008-11-10 2009-08-19 陈向阳 Permanent magnet generator rotor
CN102082473A (en) * 2010-12-15 2011-06-01 杭州富宁电器有限公司 Structure and processing technology of rotor of servo motor
CN103617880A (en) * 2013-12-10 2014-03-05 哈尔滨工业大学 Outer rotor axial magnetic circuit multi-pole reluctance type rotary transformer with redundant winding
CN104200969A (en) * 2014-09-17 2014-12-10 哈尔滨工业大学 Single-layer signal winding axial magnetic path multi-polar resolver and coil winding method
CN104200976A (en) * 2014-09-17 2014-12-10 哈尔滨工业大学 Harmonic-wave eliminating type axial magnetic circuit monopolar rotary transformer and winding method of signal windings
CN109617354A (en) * 2019-02-03 2019-04-12 哈尔滨工业大学 Rotor half-sinusoid axial magnetic circuit VR Two Speed Resolver
CN109698594A (en) * 2019-02-03 2019-04-30 哈尔滨工业大学 The linear half-wave axial magnetic circuit VR Two Speed Resolver of rotor

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Application publication date: 20210129