CN111292942A - Rotary transformer - Google Patents
Rotary transformer Download PDFInfo
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- CN111292942A CN111292942A CN201811505817.9A CN201811505817A CN111292942A CN 111292942 A CN111292942 A CN 111292942A CN 201811505817 A CN201811505817 A CN 201811505817A CN 111292942 A CN111292942 A CN 111292942A
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- yoke ring
- rotary transformer
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
Abstract
The present invention provides a rotary transformer, comprising: the rotor comprises a rotor and a stator, wherein the shape of a rotor iron core comprises X concave-convex parts to form X antipodal pairs of the rotary transformer; the stator comprises a first stator split body and a second stator split body, and the first stator split body and the second stator split body are in butt joint fit along the axial direction to form S stator slots and S corresponding stator teeth; the first stator teeth of the first stator split body are sequentially wound with a first excitation winding, a first sine winding and a first cosine winding; and a second excitation winding, a second cosine winding and a second sine winding are sequentially wound on the second stator teeth of the second stator split body. The rotary transformer provided by the invention can increase the winding space in the winding process of the winding, is convenient for automatic production and improves the production efficiency; the position detection accuracy of the rotary transformer is improved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a rotary transformer, and particularly relates to a salient pole type rotary transformer.
Background
The salient pole type rotary transformer is widely applied to occasions with high safety performance requirements, such as an automobile Electric Power Steering (EPS) motor, a traction motor and a starter generator (ISG) motor, due to simple manufacture, high stability and good temperature resistance. The stator of the salient pole type rotary transformer in the prior art is provided with three sets of windings per tooth, the winding is complex, the production efficiency is low, and the consistency of batch products is poor.
In the related art, the stator and the rotor of the rotary transformer are axially divided into two parts, a solution for simplifying a winding process and realizing automatic production is provided, but compared with the traditional solution, the axial length of the solution is doubled, and the solution is still limited in application to occasions sensitive to system installation space.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
Accordingly, an object of the present invention is to provide a resolver.
In order to achieve the above object, an aspect of the present invention provides a resolver, including: the rotor comprises a rotor iron core, the shape of the rotor iron core contains X concave-convex parts, and X antipodal pairs of the rotary transformer are formed; the stator comprises a first stator split body and a second stator split body, and the first stator split body and the second stator split body are in butt joint fit along the axial direction to form S stator slots and S corresponding stator teeth; the first stator split body comprises a first stator iron core and a first group of windings, the first stator iron core comprises a first stator yoke ring and a first stator tooth which is connected to the circumferential inner side of the first stator yoke ring and axially protrudes and extends, and the first group of windings comprise a first excitation winding, a first sine winding and a first cosine winding which are sequentially wound on the first stator tooth; the second stator split body comprises a second stator core and a second group of windings, the second stator core comprises a second stator yoke ring and second stator teeth which are connected to the circumferential inner side of the second stator yoke ring and axially protrude and extend, and the second group of windings comprise a second excitation winding, a second cosine winding and a second sine winding which are sequentially wound on the second stator teeth; the first stator sub-bodies and the second stator sub-bodies are in butt joint fit along the axial direction, so that the first stator teeth and the second stator teeth are alternately arranged along the circumferential direction, the axial end parts of the first stator teeth and the second stator teeth are aligned with each other, and S stator slots and corresponding S stator teeth are integrally formed.
According to the rotary transformer provided by the technical scheme, the stator of the rotary transformer is formed by the axial butt joint and matching of the first stator split body and the second stator split body, the first stator split body and the second stator split body are respectively wound, the distance between the adjacent first stator teeth of the first stator split body is larger, the distance between the adjacent second stator teeth of the second stator split body is larger, the space during winding is increased, the manufacturing is convenient, the automation is favorably realized, and the problems of more turns, smaller enameled wire diameter, smaller slot space and difficulty in manufacturing in the prior art are solved; and the axial height of the rotary transformer is smaller due to the design, so that the rotary transformer can be well applied to occasions sensitive to system installation space.
For the rotary transformer with the structure, a first stator of the rotary transformer is wound with a first excitation winding, then wound with a first sine winding and finally wound with a first cosine winding; a second stator of the rotary transformer is wound with a second excitation winding, a second cosine winding and a second sine winding; therefore, S/2 coils of a sine winding of the rotary transformer are located in the middle of the stator slot, S/2 coils of the sine winding are located in the outer side of the stator slot, S/2 coils of a cosine winding of the rotary transformer are located in the middle of the stator slot, and S/2 coils of the cosine winding of the rotary transformer are located in the outer side of the stator slot, so that the total coil lengths of the sine winding and the cosine winding of the rotary transformer are basically the same, the resistances of the sine winding and the cosine winding are the same, the influence of different output voltages caused by distributed capacitance is eliminated, the output voltage amplitudes of the sine winding and the cosine winding are the same, and the position detection accuracy of the rotary transformer is improved.
In addition, the rotary transformer provided in the above technical solution of the present invention may further have the following additional technical features:
in the above technical solution, preferably, the first stator split includes a first insulating skeleton and a second insulating skeleton, the first insulating skeleton and the second insulating skeleton are in butt joint along an axial direction to cover the first stator teeth, and the first excitation winding, the first sine winding and the first cosine winding are sequentially wound around an integral skeleton formed by the first insulating skeleton and the second insulating skeleton in butt joint along the axial direction; the second stator split body comprises a third insulation framework and a fourth insulation framework, the third insulation framework and the fourth insulation framework are in butt joint along the axial direction to cover the second stator teeth, and the second excitation winding, the second cosine winding and the second sine winding are sequentially wound on the third insulation framework and the fourth insulation framework which are in butt joint along the axial direction to form an integral framework.
The first insulating framework and the second insulating framework are in butt joint connection to form an integral framework covering the first stator teeth, and the first excitation winding, the first sine winding and the first cosine winding of the first stator split body are sequentially wound on the integral framework so as to ensure good insulating property; the third insulating framework and the fourth insulating framework are connected in a butt joint mode to form an integral framework covering the second stator teeth, and the second excitation winding, the second cosine winding and the second sine winding of the second stator split body are sequentially wound on the integral framework to ensure good insulating performance.
In the above technical solution, preferably, the first insulating bobbin covers a portion of the first stator tooth having the same height as the first stator yoke ring, and the second insulating bobbin covers a portion of the first stator tooth higher than the first stator yoke ring; the third insulating framework coats the part, with the same height as the second stator yoke ring, of the second stator tooth, and the fourth insulating framework coats the part, higher than the second stator yoke ring, of the second stator tooth.
The axial heights of the first insulating framework and the second insulating framework are reasonably designed, so that the first insulating framework and the second insulating framework are more conveniently mounted on the first stator teeth; the axial heights of the third insulating framework and the fourth insulating framework are reasonably designed, so that the third insulating framework and the fourth insulating framework are more conveniently mounted on the second stator teeth; of course, the axial height of each insulating skeleton is not limited to the above specific definition.
In the above technical solution, preferably, the first stator tooth protrudes and extends in a direction approaching the second stator yoke ring in an axial direction with respect to the first stator yoke ring, the second stator tooth protrudes and extends in a direction approaching the first stator yoke ring in an axial direction with respect to the second stator yoke ring, and a sum of an axial height of the first stator yoke ring and an axial height of the second stator yoke ring is equal to an axial height of the first stator tooth or the second stator tooth.
In the stator whole body formed by butt-joint matching of the first stator split body and the second stator split body, the axial height of the whole stator yoke ring formed by butt-joint of the first stator yoke ring and the second stator yoke ring is equal to the axial height of the stator teeth (the first stator teeth or the second stator teeth).
In the above technical solution, preferably, an axial height of the first stator yoke ring is 1/2 of an axial height of the first stator tooth, and an axial height of the second stator yoke ring is 1/2 of an axial height of the second stator tooth; or the axial height of the first stator yoke ring is 1/3 the axial height of the first stator tooth and the axial height of the second stator yoke ring is 2/3 the axial height of the second stator tooth.
Preferably, the axial height of the first stator yoke ring and the axial height of the second stator yoke ring are respectively half of the axial height of the first stator tooth or the second stator tooth, so that the first stator and the second stator have better structural symmetry and are convenient to machine and manufacture. Of course, the axial heights of the first stator yoke ring and the second stator yoke ring are not limited to the above specific limitations, and can be designed and adjusted reasonably according to actual conditions.
In any of the above technical solutions, preferably, the first excitation winding and the second excitation winding are collectively referred to as an excitation winding, the number of turns of each coil of the excitation winding is the same, and the coil winding directions on odd-numbered teeth and even-numbered teeth are the sameThe opposite direction is adopted; the first sinusoidal winding and the second sinusoidal winding are collectively called as sinusoidal windings, and the ith tooth of the sinusoidal winding corresponds to the number of coil turns NiComprises the following steps: n is a radical ofi＝Ns*sin(αi-ele) Wherein N isiTaking a rounded integer for the calculated value, NsThe maximum amplitude of the number of turns of the sinusoidal winding coil, the electrical angle α corresponding to the ith toothi-eleα isi-ele＝i*360°·X/S，NiWhen taking a positive value, the winding direction of the coil is positive, NiWhen the value is negative, the winding direction of the coil is reversed.
The reasonable design of the number of turns of each coil of the excitation winding, the sine winding and the cosine winding of the rotary transformer is realized, so that the accuracy of the measurement angle of the rotary transformer is ensured.
In any one of the above technical solutions, preferably, a first clamping structure is disposed at a connection position of the first stator tooth and the second stator yoke ring, and a second clamping structure is disposed at a connection position of the second stator tooth and the first stator yoke ring.
The first stator split body and the second stator split body are firmly assembled by the first clamping structure and the second clamping structure, and the structure is simple, the assembly is convenient, and the connection is firm.
In the above technical solution, preferably, the first clamping structure includes a first trapezoidal groove formed on an inner circumferential surface of the second stator yoke ring and a first trapezoidal protrusion formed on an outer side surface of the first stator tooth; the second clamping structure comprises a second trapezoidal groove arranged on the inner peripheral surface of the first stator yoke ring and a second trapezoidal protrusion arranged on the outer side surface of the second stator tooth.
The clamping structure with the trapezoidal grooves matched with the trapezoidal bulges is adopted, so that the first stator split body and the second stator split body are firmly assembled, the structure is simple, the processing is convenient, and the connection is firm.
In any of the above technical solutions, preferably, the outgoing lines of the first excitation winding, the first sine winding, and the first cosine winding are led out from a side close to the first stator yoke ring, and the outgoing lines of the second excitation winding, the second cosine winding, and the second sine winding are led out from a side far from the second stator yoke ring; or the outgoing lines of the first excitation winding, the first sine winding and the first cosine winding are led out from one side far away from the first stator yoke ring, and the outgoing lines of the second excitation winding, the second cosine winding and the second sine winding are led out from one side close to the second stator yoke ring.
The design realizes that the outgoing lines of the first excitation winding, the first sine winding, the first cosine winding, the second excitation winding, the second cosine winding and the second sine winding are all led out from one side of the whole stator, and the corresponding windings are convenient to perform wiring operation.
In any of the above technical solutions, preferably, the first excitation winding and the second excitation winding are connected to form 2 positive and negative outgoing lines of the excitation winding of the rotary transformer; the first sinusoidal winding and the second sinusoidal winding are connected to form a positive outlet wire and a negative outlet wire of the sinusoidal winding of the rotary transformer; and the first cosine winding and the second cosine winding are connected to form a positive outlet wire and a negative outlet wire of the cosine winding of the rotary transformer.
In any of the above embodiments, preferably, the number X of pole pairs of the rotor is 7, and the number S of stator slots of the stator is 20.
In any of the above technical solutions, preferably, the lamination thickness of the rotor core in the axial direction is greater than the lamination thickness of the stator in the axial direction, so as to prevent magnetic leakage and ensure a strong output signal.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a first stator division body and a second stator division body of a resolver according to an embodiment of the present invention;
fig. 2 is an exploded structural view of a first stator division body and a second stator division body of a resolver according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a rotary transformer of one embodiment of the present invention;
FIG. 4 is a wiring diagram of a 20 slot 7 antipodal resolver of one embodiment of the invention;
FIG. 5 is a winding sequence diagram of a rotary transformer in accordance with one embodiment of the present invention;
FIG. 6 is a spatial distribution diagram of the individual coils of the sinusoidal winding of a rotary transformer in accordance with one embodiment of the present invention;
FIG. 7 is a schematic diagram of the relative position of the coils within the slots of a rotary transformer in accordance with one embodiment of the present invention; where a) is the ideal position, b) is the asymmetric position that may exist for actual manufacturing;
fig. 8 is an output voltage waveform of a sinusoidal winding split positive and negative component coil of the present invention distributed asymmetrically within the slots.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:
1, a rotor iron core, 2, a first stator split body and 3, a second stator split body;
the transformer comprises a first stator core 21, a first exciting winding 22, a first sine winding 23, a first cosine winding 24, a first insulating framework 25 and a second insulating framework 26;
31 a second stator core, 32 a second excitation winding, 33 a second sine winding, 34 a second cosine winding, 35 a third insulation framework and 36 a fourth insulation framework;
211 a first stator yoke ring, 212 a first stator tooth, 311 a second stator yoke ring, 312 a second stator tooth;
2111 second trapezoidal groove, 3111 first trapezoidal groove.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A resolver according to some embodiments of the present invention is described below with reference to fig. 1 to 8.
As shown in fig. 1 to 3, there is provided a resolver according to some embodiments of the present invention, including: a rotor and a stator.
Specifically, as shown in fig. 3, the rotor includes a rotor core 1, the rotor core 1 may be formed by axially laminating silicon steel sheets, and the shape of the rotor core 1 includes X recesses and protrusions to form X pairs of opposite poles of the rotary transformer; as shown in fig. 1, the stator includes a first stator sub-body 2 and a second stator sub-body 3, and the first stator sub-body 2 and the second stator sub-body 3 are in butt-joint fit along the axial direction to form S stator slots and corresponding S stator teeth. The first stator split 2 comprises a first stator core 21 and a first group of windings, the first stator core 21 comprises a first stator yoke ring 211 and a first stator tooth 212 which is connected to the circumferential inner side of the first stator yoke ring 211 and axially protrudes and extends, and the first group of windings comprises a first excitation winding 22, a first sine winding 23 and a first cosine winding 24 which are sequentially wound on the first stator tooth 212; the second stator split 3 includes a second stator core 31 and a second group of windings, the second stator core 31 includes a second stator yoke ring 311 and a second stator tooth 312 connected to the inner side of the second stator yoke ring 311 in the circumferential direction and extending in the axial direction, the second group of windings includes a second excitation winding 32, a second cosine winding 34 and a second sine winding 33 wound on the second stator tooth 312 in sequence; the first stator sub-body 2 and the second stator sub-body 3 are axially butt-fitted so that the first stator teeth 212 and the second stator teeth 312 are alternately arranged in the circumferential direction with their axial ends aligned with each other, and the S stator slots and the corresponding S stator teeth are integrally formed.
It should be noted that the first group of windings includes a first excitation winding 22, a first sine winding 23, and a first cosine winding 24 that are sequentially wound on the first stator tooth 212, that is, the first excitation winding 22 is wound on the first stator tooth 212, the first sine winding 23 is wound on the first excitation winding 22, and finally the first cosine winding 24 is wound on the first sine winding 23, where the first excitation winding 22 is an input winding, and the first sine winding 23 and the first cosine winding 24 are output windings; the second group of windings includes a second excitation winding 32, a second cosine winding 34 and a second sine winding 33 which are sequentially wound on the second stator tooth 312, that is, the second excitation winding 32 is firstly wound on the second stator tooth 312, then the second cosine winding 34 is wound on the second excitation winding 32, and finally the second sine winding 33 is wound on the second cosine winding 34, wherein the second excitation winding 32 is an input winding, and the second sine winding 33 and the second cosine winding 34 are output windings.
In the rotary transformer provided by the above embodiment of the invention, the stator of the rotary transformer is formed by the first stator split 2 and the second stator split 3 in butt joint and matching along the axial direction, the first stator split 2 and the second stator split 3 are respectively wound, the distance between the adjacent first stator teeth 212 of the first stator split 2 is larger, and the distance between the adjacent second stator teeth 312 of the second stator split 3 is larger, so that the space during winding is increased, the manufacture is convenient, the automation is favorably realized, and the problems of more turns, smaller enameled wire diameter, smaller slot space and difficult manufacture in the prior art are solved; and the axial height of the rotary transformer is smaller due to the design, so that the rotary transformer can be well applied to occasions sensitive to system installation space.
For the rotary transformer with the structure, a first stator of the rotary transformer is wound with a first excitation winding 22, a first sine winding 23 and a first cosine winding 24; the second stator of the rotary transformer is wound with a second excitation winding 32, a second cosine winding 34 and a second sine winding 33; therefore, S/2 coils of a sine winding of the rotary transformer are located in the middle of the stator slot, S/2 coils of the sine winding are located in the outer side of the stator slot, S/2 coils of a cosine winding of the rotary transformer are located in the middle of the stator slot, and S/2 coils of the cosine winding of the rotary transformer are located in the outer side of the stator slot, so that the total coil lengths of the sine winding and the cosine winding of the rotary transformer are basically the same, the resistances of the sine winding and the cosine winding are the same, the influence of different output voltages caused by distributed capacitance is eliminated, the output voltage amplitudes of the sine winding and the cosine winding are the same, and the position detection accuracy of the rotary transformer is improved.
In an embodiment of the present invention, a connection position of the first stator tooth 212 and the second stator yoke ring 311 is provided with a first snap structure, and a connection position of the second stator tooth 312 and the first stator yoke ring 211 is provided with a second snap structure. In one embodiment, as shown in fig. 1 and 3, the first clamping structure includes a first trapezoidal groove 3111 disposed on an inner circumferential surface of the second stator yoke ring 311 and a first trapezoidal protrusion disposed on an outer side surface of the first stator tooth 212; the second engaging structure includes a second trapezoidal recess 2111 formed on the inner circumferential surface of the first stator yoke ring 211 and a second trapezoidal protrusion formed on the outer side surface of the second stator tooth 312. Adopt trapezoidal recess and trapezoidal protruding complex joint structure, realize the firm assembly of first stator components of a whole that can function independently 2 and second stator components of a whole that can function independently 3, simple structure, processing is convenient, firm in connection.
Further, as shown in fig. 2, the first stator sub-body 2 includes a first insulating skeleton 25 and a second insulating skeleton 26, the first insulating skeleton 25 and the second insulating skeleton 26 are butted along the axial direction to cover the first stator teeth 212, and the first excitation winding 22, the first sine winding 23 and the first cosine winding 24 are sequentially wound on an integral skeleton formed by the first insulating skeleton 25 and the second insulating skeleton 26 being butted along the axial direction; the second stator split 3 includes a third insulating bobbin 35 and a fourth insulating bobbin 36, the third insulating bobbin 35 and the fourth insulating bobbin 36 are in butt joint with each other in the axial direction to cover the second stator teeth 312, and the second excitation winding 32, the second cosine winding 34 and the second sine winding 33 are sequentially wound on an integral bobbin formed by the third insulating bobbin 35 and the fourth insulating bobbin 36 in butt joint in the axial direction, so that good insulating performance is ensured by using each insulating bobbin.
Preferably, the first insulating skeleton 25 covers a portion of the first stator tooth 212 having the same height as the first stator yoke ring 211, and the second insulating skeleton 26 covers a portion of the first stator tooth 212 higher than the first stator yoke ring 211; the third insulating framework 35 coats the part of the second stator tooth 312, which is at the same height as the second stator yoke ring 311, and the fourth insulating framework 36 coats the part of the second stator tooth 312, which is higher than the second stator yoke ring 311, so that the design makes the installation of each insulating framework more convenient; of course, the axial height of each insulating skeleton is not limited to the above specific definition.
In an embodiment of the present invention, as shown in fig. 1 and 2, the first stator tooth 212 protrudes and extends in a direction approaching the second stator yoke ring 311 in an axial direction with respect to the first stator yoke ring 211, the second stator tooth 312 protrudes and extends in a direction approaching the first stator yoke ring 211 in an axial direction with respect to the second stator yoke ring 311, and a sum of an axial height of the first stator yoke ring 211 and an axial height of the second stator yoke ring 311 is equal to an axial height of the first stator tooth 212 or the second stator tooth 312, that is, an axial height of an integral stator yoke ring formed after the first stator yoke ring 211 and the second stator yoke ring 311 are butted is equal to an axial height of the first stator tooth 212 or the second stator tooth 312.
In one embodiment, as shown in fig. 1 and 2, the axial height of the first stator yoke ring 211 is 1/2 of the axial height of the first stator tooth 212, and the axial height of the second stator yoke ring 311 is 1/2 of the axial height of the second stator tooth 312, that is, the axial heights of the first stator yoke ring 211 and the second stator yoke ring 311 are each half of the axial height of the first stator tooth 212 or the axial height of the second stator tooth 312, so that the first stator and the second stator have better structural symmetry and are convenient to machine and manufacture.
In another embodiment, the axial height of the first stator yoke ring 211 is 1/3 the axial height of the first stator teeth 212, and the axial height of the second stator yoke ring 311 is 2/3 the axial height of the second stator teeth 312. Of course, the axial heights of the first and second stator yoke rings 211 and 311 are not limited to the above specific limitations, and may be designed and adjusted according to practical situations.
In a specific example, as shown in fig. 2, the first stator core 21 included in the first stator sub-body 2 of the resolver includes S/2 first stator teeth 212 uniformly distributed and a whole first stator yoke ring 211 connecting the S/2 first stator teeth, wherein the height of the first stator yoke ring 211 is half of the height of the first stator teeth 212, the first insulating bobbin 25 covers a slot insulation of half of the axial length of the first stator core 21, the second insulating bobbin 26 covers a portion of the first stator tooth 212 higher than the first stator yoke ring 211, and the first insulating bobbin 25 and the second insulating bobbin 26 axially butt-joint cover the slot of the first stator core 21.
In one embodiment of the present invention, the outgoing lines of the first excitation winding 22, the first sine winding 23, and the first cosine winding 24 are led out from a side close to the first stator yoke ring 211, and the outgoing lines of the second excitation winding 32, the second cosine winding 34, and the second sine winding 33 are led out from a side far from the second stator yoke ring 311; or the outgoing lines of the first excitation winding 22, the first sine winding 23 and the first cosine winding 24 are led out from one side far away from the first stator yoke ring 211, and the outgoing lines of the second excitation winding 32, the second cosine winding 34 and the second sine winding 33 are led out from one side close to the second stator yoke ring 311. The design realizes that the outgoing lines of the first excitation winding 22, the first sine winding 23, the first cosine winding 24, the second excitation winding 32, the second cosine winding 34 and the second sine winding 33 are all led out from one side of the whole stator, so that the corresponding windings can be conveniently wired.
In one embodiment of the present invention, the first excitation winding 22 and the second excitation winding 32 are wired to form the positive and negative 2 outgoing lines of the excitation winding of the resolver; the first sinusoidal winding 23 and the second sinusoidal winding 33 are connected to form a positive outlet wire and a negative outlet wire of the sinusoidal winding of the rotary transformer; the first cosine winding 24 and the second cosine winding 34 are connected to form positive and negative 2 outgoing lines of the cosine winding of the rotary transformer.
In a specific embodiment, the first stator sub-body 2 is wound with the first excitation winding 22, then wound with the first sine winding 23, and finally wound with the first cosine winding 24, and the outlet ends are led out 6 from one side close to the first stator yoke ring 211; the second stator split body 3 is wound with a second excitation winding 32, then a second cosine winding 34 and finally a second sine winding 33, and 6 wire outlet ends are led out from one side far away from the second stator yoke ring 311; and the first stator split body 2 and the second stator split body 3 which are wound are in axial butt joint matching. The winding initial end of the first excitation winding 22 is connected with the winding initial end of the second excitation winding 32 to form the positive end of the excitation winding of the rotary transformer, and the winding finishing end of the first excitation winding 22 is connected with the winding finishing end of the second excitation winding 32 to form the negative end of the excitation winding of the rotary transformer; the winding initial end of the first sinusoidal winding 23 is connected with the winding initial end of the second sinusoidal winding 33 to form the positive end of the sinusoidal winding of the rotary transformer, and the winding end of the first sinusoidal winding 23 is connected with the winding end of the second sinusoidal winding 33 to form the negative end of the sinusoidal winding of the rotary transformer; the initial winding end of the first cosine winding 24 is connected with the initial winding end of the second cosine winding 34 to form the positive end of the cosine winding of the rotary transformer, and the winding end of the first cosine winding 24 is connected with the winding end of the second cosine winding 34 to form the negative end of the cosine winding of the rotary transformer.
Fig. 5 is a sequence diagram of the windings of a salient pole resolver according to an embodiment of the invention:
firstly, winding the first stator split body 2 for the first time, winding odd teeth from c1 to c19 to form a first excitation coil with the same number of turns and the same winding direction, and leading out ends E1+ and E1-, wherein the leading out ends extend out from one side close to the first stator yoke ring 211, and the position of the coil is located at the position 11 relative to the groove shown in the figure 7a) during winding;
secondly, the first stator split body 2 is wound for the second time, a first sine winding 23 is wound, wire outlet ends S1+ and S1-extend out from one side close to the first stator yoke ring 211, and the coil position is at the position 21 corresponding to the groove shown in the figure 7a) during winding;
thirdly, the first stator split 2 is wound for the third time, a first cosine winding 24 is wound, wire outlet ends C1+ and C1-extend out from one side close to the first stator yoke ring 211, and the coil position is at the position 12 corresponding to the slot shown in the figure 7a) during winding;
fourthly, the second stator split body 3 is wound for the first time, even teeth are wound from c2 to c20, the winding direction is the same, but the winding direction of the even teeth is opposite to that of the exciting coil wound by the first stator split body 2, coil outlet ends E2+ and E2-extend out of one side far away from the second stator yoke ring 311, and the coil position is at the position 11 opposite to the slot shown in the figure 7a) during winding;
fifthly, the second stator split body 3 is wound for the second time, a second cosine winding 34 is wound, wire outlet ends C2+ and C2-extend out from one side far away from the second stator yoke ring 311, and the coil position is at the relative position 21 of the slot shown in the figure 7a) during winding;
sixthly, the second stator split body 3 is wound for the third time, a second sinusoidal winding 33 is wound, wire outlet ends S2+ and S2-extend out from one side far away from the second stator yoke ring 311, and the position of a coil is located at the position 12 corresponding to the slot shown in the figure 7a) during winding;
and the first stator split body 2 and the second stator split body 3 which are wound are axially butted and matched to form the stator of the rotary transformer. The six coils have 12 wire outlets which are led out from one side of the first stator split body 2 close to the first stator yoke ring 211, E1+ and E2+ are connected and lead out to the wire E +, which is the positive terminal of the excitation winding, and E1-and E2-are connected and lead out to the wire E-, which is the negative terminal of the excitation winding; s1+ and S2+ are connected and lead out S +, which is the positive terminal of the sine winding, and S1-and S2-are connected and lead out S-, which is the negative terminal of the sine winding; c1+ and C2+ are connected and lead out C +, which is the positive terminal of the cosine winding, and C1-and C2-are connected and lead out C-, which is the negative terminal of the cosine winding.
In some embodiments of the present invention, the first excitation winding 22 and the second excitation winding 32 are collectively referred to as excitation windings, the number of turns of each coil of the excitation windings is the same, and the winding directions of the coils on the odd-numbered teeth and the even-numbered teeth are opposite; the first sine winding 23 and the second sine winding 33 are collectively called sine winding, the first cosine winding 24 and the second cosine winding 34 are collectively called cosine winding, and the ith tooth of the sine winding corresponds to the number N of coil turnsiComprises the following steps: n is a radical ofi＝Ns*sin(αi-ele) Wherein N isiTaking a rounded integer for the calculated value, NsThe maximum amplitude of the number of turns of the sinusoidal winding coil, the electrical angle α corresponding to the ith toothi-eleα isi-ele＝i*360°·X/S，NiWhen taking a positive value, the winding direction of the coil is positive, NiWhen the value is negative, the winding direction of the coil is reversed. The design realizes the turns of each coil of the excitation winding, the sine winding and the cosine winding of the rotary transformerThe reasonable design of the rotary transformer ensures the accuracy of the measurement angle of the rotary transformer.
In one embodiment, the number of pole pairs X of the rotor is 7, and the number of stator slots S of the stator is 20. Of course, the number of pole pairs of the rotor and the number of stator slots of the stator are not limited to the above specific limitations.
The following description will be made by taking a 20-slot 7 opposed-pole resolver as an example, but the present invention is not limited to this specific example.
As shown in FIG. 4, which is a wiring diagram of a 20-slot 7-antipodal salient pole type rotary transformer, the electrical angle corresponding to the ith tooth is αi-eleI 360 °. 7/20 i 126 °, where i is a positive integer, and the mechanical angle corresponding to the ith tooth is αi-mecThe stator comprises three sets of coils, one set of input coils, namely excitation windings, two sets of output coils, namely sine windings and cosine windings, wherein the number of turns of each coil of the excitation windings is the same: ne is 28, the winding directions of two adjacent excitation windings are opposite, the "-" before the turns represents the counterclockwise winding direction, and the unsigned before the turns represents the clockwise winding direction; the ith tooth of the sine winding corresponds to the number of turns: n is a radical ofi＝Ns*sin(αi-ele) In which N isiTaking a rounded integer for the calculated value, taking Ne＝28，N5When the ratio is 50, then N4＝N5*sin(72°)＝48，N3＝N5*sin(54°)＝40，N2＝N5*sin(36°)＝29，N1＝N5*sin(18°)＝15。
As shown in fig. 6, the spatial distribution of each coil of the sinusoidal winding of the 20-slot 7-pole salient-pole type rotary transformer can be seen from the figure: number of turns of N5The coil (A) is: c6 and c16, wherein the output voltage of c16 is positive, and the output voltage of c6 is negative; number of turns of N4The coil (A) is: c3, c9, c13 and c19, wherein the output voltages of c3 and c19 are positive, and the output voltages of c9 and c13 are negative; number of turns of N3The coil (A) is: c2, c10, c12 and c20, wherein the output voltages of c2 and c10 are positive, and the output voltages of c12 and c20 are negative; number of turns of N2The coil (2) has: c5, c7, c15 and c17, wherein the output voltages of c15 and c17 are positive, and the output voltages of c5 and c7 are negative; number of turns ofN1The coil (2) has: c4, c8, c14 and c18, wherein the output voltages of c4 and c8 are positive, and the output voltages of c14 and c18 are negative. Wherein, the number of turns is N5The positive and negative of the coil are respectively provided with an electric angle difference of 180 degrees, and the number of turns of the cosine winding coil corresponding to the stator tooth where the coil is located is 0. Number of turns of N4、N3、N2、N1Positive and negative coils. In the number of turns N4For example, the positive components are c3 and c19, and the negative components are c9 and c 13. As shown in fig. 7, the relative position of the coil in the slot is ideally, as shown in fig. 7a), four positions of the coil in the slot are: 11. 12, 21 and 22, the upper, lower, left and right positions are fixed, and the number of turns N is equal4The positive components c3 and c19 are located at the position of the slot 11 and the negative component at the position of the slot 12, which results in the number of turns N4The positive component and the negative component of the voltage are different in position, and because an asymmetric position may exist in actual manufacturing, an output voltage waveform that the positive component coil and the negative component coil are asymmetrically distributed in the slot as shown in fig. 8 is formed by splitting the sinusoidal winding, so that the synthesized voltage has a direct current component, and the number of turns is N4The four coils synthesize output voltage to generate direct current component, and if the winding is unreasonable, N is adopted3、N2、N1The actual winding process may also be performed with the number of turns of N4The four coils of the motor rotor have the problems that the output voltage waveform of the output winding coils is asymmetrically distributed, the output voltage of the sine winding and the cosine winding has direct current components, and the peak values of sine envelope signals are different in size, so that the rotor position signals indirectly obtained from the output voltage are inaccurate, and the precision is insufficient.
Preferably, the rotor is formed by axially laminating silicon steel sheets, and the first stator core 21 and the second stator core 31 of the stator are formed by axially laminating stator punching sheets; the laminating thickness of the rotor core 1 along the axial direction is larger than that of the stator along the axial direction, so that magnetic leakage is prevented, and the output signal is ensured to be strong.
In summary, the rotary transformer provided by the embodiment of the invention can increase the winding space in the winding process of the winding, facilitate automatic production, and improve the production efficiency; the influence of different output voltages caused by distributed capacitance can be eliminated, so that the amplitude values of the output voltages of the sine winding and the cosine winding are the same, and the position detection precision of the rotary transformer is improved.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, e.g., "connected" may be a fixed connection, a detachable connection, an integral connection, or an electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A rotary transformer, comprising:
the rotor comprises a rotor iron core, the shape of the rotor iron core contains X concave-convex parts, and X antipodal pairs of the rotary transformer are formed; and
the stator comprises a first stator split body and a second stator split body, and the first stator split body and the second stator split body are in butt joint fit along the axial direction to form S stator slots and S corresponding stator teeth;
the first stator split body comprises a first stator iron core and a first group of windings, the first stator iron core comprises a first stator yoke ring and a first stator tooth which is connected to the circumferential inner side of the first stator yoke ring and axially protrudes and extends, and the first group of windings comprise a first excitation winding, a first sine winding and a first cosine winding which are sequentially wound on the first stator tooth;
the second stator split body comprises a second stator core and a second group of windings, the second stator core comprises a second stator yoke ring and second stator teeth which are connected to the circumferential inner side of the second stator yoke ring and axially protrude and extend, and the second group of windings comprise a second excitation winding, a second cosine winding and a second sine winding which are sequentially wound on the second stator teeth;
the first stator sub-bodies and the second stator sub-bodies are in butt joint fit along the axial direction, so that the first stator teeth and the second stator teeth are alternately arranged along the circumferential direction, the axial end parts of the first stator teeth and the second stator teeth are aligned with each other, and S stator slots and corresponding S stator teeth are integrally formed.
2. The rotary transformer of claim 1,
the first stator split comprises a first insulation framework and a second insulation framework, the first insulation framework and the second insulation framework are in butt joint along the axial direction to cover the first stator teeth, and the first excitation winding, the first sine winding and the first cosine winding are sequentially wound on an integral framework formed by the first insulation framework and the second insulation framework in butt joint along the axial direction;
the second stator split body comprises a third insulation framework and a fourth insulation framework, the third insulation framework and the fourth insulation framework are in butt joint along the axial direction to cover the second stator teeth, and the second excitation winding, the second cosine winding and the second sine winding are sequentially wound on the third insulation framework and the fourth insulation framework which are in butt joint along the axial direction to form an integral framework.
3. The rotary transformer of claim 2,
the first insulating framework wraps the part, with the same height as the first stator yoke ring, of the first stator tooth, and the second insulating framework wraps the part, higher than the first stator yoke ring, of the first stator tooth;
the third insulating framework coats the part, with the same height as the second stator yoke ring, of the second stator tooth, and the fourth insulating framework coats the part, higher than the second stator yoke ring, of the second stator tooth.
4. The rotary transformer of claim 1,
the first stator tooth protrudes and extends in a direction approaching the second stator yoke ring in the axial direction relative to the first stator yoke ring, the second stator tooth protrudes and extends in a direction approaching the first stator yoke ring in the axial direction relative to the second stator yoke ring, and the sum of the axial height of the first stator yoke ring and the axial height of the second stator yoke ring is equal to the axial height of the first stator tooth or the second stator tooth.
5. The rotary transformer of claim 4,
the axial height of the first stator yoke ring is 1/2 the axial height of the first stator tooth, the axial height of the second stator yoke ring is 1/2 the axial height of the second stator tooth; or
The axial height of the first stator yoke ring is 1/3 the axial height of the first stator tooth and the axial height of the second stator yoke ring is 2/3 the axial height of the second stator tooth.
6. The rotary transformer according to any one of claims 1 to 5,
the first excitation winding and the second excitation winding are collectively called as excitation windings, the number of turns of each coil of the excitation windings is the same, and the winding directions of the coils on odd-numbered teeth and even-numbered teeth are opposite;
the first sinusoidal winding and the second sinusoidal winding are collectively called as sinusoidal windings, and the ith tooth of the sinusoidal winding corresponds to the number of coil turns NiComprises the following steps: n is a radical ofi＝Ns*sin(αi-ele) Wherein N isiTaking a rounded integer for the calculated value, NsThe maximum amplitude of the number of turns of the sinusoidal winding coil, the electrical angle α corresponding to the ith toothi-eleα isi-ele＝i*360°·X/S，NiWhen taking a positive value, the winding direction of the coil is positive, NiWhen the value is negative, the winding direction of the coil is reversed.
7. The rotary transformer according to any one of claims 1 to 5,
the first stator tooth with the hookup location of second stator yoke ring is equipped with first joint structure, the second stator tooth with the hookup location of first stator yoke ring is equipped with second joint structure.
8. The rotary transformer of claim 7,
the first clamping structure comprises a first trapezoidal groove arranged on the inner circumferential surface of the second stator yoke ring and a first trapezoidal protrusion arranged on the outer side surface of the first stator tooth;
the second clamping structure comprises a second trapezoidal groove arranged on the inner peripheral surface of the first stator yoke ring and a second trapezoidal protrusion arranged on the outer side surface of the second stator tooth.
9. The rotary transformer according to any one of claims 1 to 5,
the outgoing lines of the first excitation winding, the first sine winding and the first cosine winding are led out from one side close to the first stator yoke ring, and the outgoing lines of the second excitation winding, the second cosine winding and the second sine winding are led out from one side far away from the second stator yoke ring; or
The outgoing lines of the first excitation winding, the first sine winding and the first cosine winding are led out from one side far away from the first stator yoke ring, and the outgoing lines of the second excitation winding, the second cosine winding and the second sine winding are led out from one side close to the second stator yoke ring.
10. The rotary transformer according to any one of claims 1 to 5,
the first excitation winding and the second excitation winding are connected to form a positive outlet wire and a negative outlet wire of the excitation winding of the rotary transformer;
the first sinusoidal winding and the second sinusoidal winding are connected to form a positive outlet wire and a negative outlet wire of the sinusoidal winding of the rotary transformer;
and the first cosine winding and the second cosine winding are connected to form a positive outlet wire and a negative outlet wire of the cosine winding of the rotary transformer.
11. The rotary transformer according to any one of claims 1 to 5,
the number of pole pairs X of the rotor is 7, and the number of stator slots S of the stator is 20.
12. The rotary transformer according to any one of claims 1 to 5,
the lamination thickness of the rotor core along the axial direction is larger than that of the stator along the axial direction.
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| CN201811505817.9A CN111292942A (en) | 2018-12-10 | 2018-12-10 | Rotary transformer |
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| CN201811505817.9A CN111292942A (en) | 2018-12-10 | 2018-12-10 | Rotary transformer |
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