阅读说明：本技术 一种无刷旋转变压器 (Brushless rotary transformer ) 是由 许兴斗 吴立建 周竞捷 王永博 周奇慧 周昊宇 王文婷 于 2020-04-26 设计创作，主要内容包括：一种无刷旋转变压器,包括转轴和同轴设置的旋变组件与环变组件；旋变组件包括旋变定子和旋变转子,旋变转子和旋变定子分别具有各自的铁芯和绕组；环变组件的铁芯设有绕组容纳槽,绕组设置于绕组容纳槽内；环变定子的绕组容纳槽的轴向长度大于环变转子的绕组容纳槽的轴向长度,且环变转子铁芯的轴向长度大于环变定子铁芯的轴向长度。本发明中,环变定子槽和环变定子绕组线圈骨架的结构相比传统结构有所改变和增加,使得环形定子绕组线圈的分布方式有所改变和增加,在特殊工况下,当转子存在轴向窜动时,变压器输出变压比仍能满足正常工作要求,具有较高的可靠性。(A brushless rotary transformer comprises a rotating shaft, a rotary transformer assembly and a ring transformer assembly, wherein the rotary transformer assembly and the ring transformer assembly are coaxially arranged; the rotary transformer assembly comprises a rotary transformer stator and a rotary transformer rotor, and the rotary transformer rotor and the rotary transformer stator are respectively provided with an iron core and a winding; the iron core of the annular transformer assembly is provided with a winding accommodating groove, and the winding is arranged in the winding accommodating groove; the axial length of the winding accommodating groove of the ring variable stator is greater than that of the winding accommodating groove of the ring variable rotor, and the axial length of the core of the ring variable rotor is greater than that of the core of the ring variable stator. In the invention, compared with the traditional structure, the structure of the ring variable stator slot and the ring variable stator winding coil skeleton is changed and increased, so that the distribution mode of the ring variable stator winding coil is changed and increased, and under special working conditions, when the rotor axially moves, the output transformation ratio of the transformer can still meet the normal working requirement, and the reliability is higher.)

1. A brushless resolver, comprising: the rotating shaft is coaxially arranged with the rotating assembly and the annular transformer assembly; the rotary transformer assembly comprises a rotary transformer stator and a rotary transformer rotor, and the rotary transformer rotor and the rotary transformer stator are respectively provided with an iron core and a winding; the axial length of the rotary transformer stator iron core is greater than that of the rotary transformer rotor iron core; the ring transformer assembly comprises a ring transformer stator and a ring transformer rotor, and the ring transformer rotor and the ring transformer stator are respectively provided with an iron core and a winding; the iron core of the annular transformer assembly is provided with a winding accommodating groove, and the winding is arranged in the winding accommodating groove; the axial length of the winding accommodating groove of the ring variable stator is greater than that of the winding accommodating groove of the ring variable rotor, and the axial length of the core of the ring variable rotor is greater than that of the core of the ring variable stator.

2. The brushless resolver of claim 1, wherein: the axial length of the ring variable stator iron core is equal to the axial length of the ring variable rotor iron core plus the axial play amount; and/or the axial length of the rotary transformer stator iron core is equal to the axial length of the rotary transformer rotor iron core plus the axial play amount; the axial transfer amount includes the sum of the play amounts in all the play directions.

3. The brushless resolver according to claim 1 or 2, wherein: the winding of the ring variable stator is wound on the framework, the shape of the framework determines the distribution of the winding, and the framework is fixed in the winding accommodating groove of the ring variable stator; or the winding is directly wound in the winding accommodating groove, and the groove shape of the winding accommodating groove determines the distribution of the winding.

4. The brushless resolver of claim 3, wherein: the ring variable stator winding is laid in the winding accommodating groove, or the area of the ring variable stator winding is equal to that of the ring variable rotor winding, and the ring variable stator winding is arranged in the middle or at any side of the winding accommodating groove; or, the ring-variable stator windings are symmetrically distributed with less middle and more sides, for example, the stator windings and the rotor are in a C shape, an oval shape, a triangle shape, etc.; the above-described distribution of the windings can be achieved by setting the groove shape of the bobbin or the winding accommodating groove to the shape of the winding arrangement mode.

5. The brushless resolver of claim 1, wherein: the annular stator winding is connected with excitation voltageU ₁ = Usin(ωt)Two-phase output signals are obtained at the stator winding of the rotary transformer assembly, and the output voltages are respectively as follows:U _C = KUsin(ωt)cos (pθ)，U _S = KUsin(ωt)sin(pθ)whereinKIn order to obtain the transformation ratio,Uin order to input the amplitude of the voltage,ωin order to be the frequency of the excitation,pthe number of the pole pairs is the number of the pole pairs,θis the rotor mechanical angle.

6. The brushless resolver of claim 1, wherein: the materials of the rotary transformer stator iron core, the rotary transformer rotor iron core, the ring transformer stator iron core and the ring transformer rotor iron core are all silicon steel sheets.

Technical Field

The invention relates to the technical field of rotary transformer assemblies, in particular to a brushless rotary transformer.

Background

The rotary transformer assembly is commonly used for sensing and measuring angular positions in a numerical control system, has incomparable reliability and high precision relative to other angular position sensing elements such as a magnetic encoder, an optical encoder and the like, and has an irreplaceable position in many occasions, particularly in the aspects of military affairs, aerospace and the like. In order to adapt to the rapid development of modern weaponry, for servo control systems such as electronic countermeasure, photoelectric tracking, radar and the like, a rotary transformer component is required to have high precision and high reliability, and the rotary transformer component is required to be capable of adapting to certain severe or special working occasions.

In some use occasions, the rotor has large axial movement, and the rotary transformer assembly is required to be suitable for the working condition. The axial float can obviously change the magnetic circuit of the traditional rotary transformer assembly, greatly influence the performance parameters of the rotary transformer assembly such as the transformation ratio, the phase shift and the like, and further influence the normal work of a post-stage resolving circuit of the rotary transformer assembly in the system.

Disclosure of Invention

The invention aims to provide a high-reliability brushless rotary transformer which can meet the normal working requirement even if the rotor axially moves and the transformer output transformation ratio.

A brushless rotary transformer comprises a rotating shaft, a rotary transformer assembly and a ring transformer assembly, wherein the rotary transformer assembly and the ring transformer assembly are coaxially arranged; the rotary transformer assembly comprises a rotary transformer stator and a rotary transformer rotor, and the rotary transformer rotor and the rotary transformer stator are respectively provided with an iron core and a winding; the axial length of the rotary transformer stator iron core is greater than that of the rotary transformer rotor iron core; the ring transformer assembly comprises a ring transformer stator and a ring transformer rotor, and the ring transformer rotor and the ring transformer stator are respectively provided with an iron core and a winding; the iron core of the annular transformer assembly is provided with a winding accommodating groove, and the winding is arranged in the winding accommodating groove; the axial length of the winding accommodating groove of the ring variable stator is greater than that of the winding accommodating groove of the ring variable rotor, and the axial length of the core of the ring variable rotor is greater than that of the core of the ring variable stator.

When the rotating shaft axially moves, the relative area of the moved ring-variable rotor and the moved ring-variable stator is basically unchanged, and even if the rotating shaft axially moves, the moved stator core is still in the range covered by the rotor core, so that the relative area of the stator core and the rotor core is basically unchanged, and the change of a magnetic circuit is reduced. In the same way, the length of the rotary transformer stator iron core is larger than that of the rotary transformer system iron core, and the change of a magnetic circuit is reduced. Therefore, the brushless rotary transformer has stable magnetic circuit, the transformer output transformation ratio can still meet the normal working requirement, and the brushless rotary transformer has higher reliability.

Preferably, the axial length of the ring transformer stator iron core is equal to the axial length of the ring transformer rotor iron core plus the axial play amount; and/or the axial length of the rotary transformer stator iron core is equal to the axial length of the rotary transformer rotor iron core plus the axial play amount; the axial transfer amount includes the sum of the play amounts in all the play directions.

The stator core is fixed, the rotor core is installed on the rotating shaft, the rotating shaft can possibly find play in the front direction and the rear direction of the shaft, and if the forward play amount and the backward play amount are both X, the axial play amount is 2X.

Preferably, the winding of the ring-changing stator is wound on a framework, the shape of the framework determines the distribution of the winding, and the framework is fixed in the winding accommodating groove of the ring-changing stator; or the winding is directly wound in the winding accommodating groove, and the groove shape of the winding accommodating groove determines the distribution of the winding.

Preferably, the ring variable stator winding is laid in the winding accommodating groove, or the area of the ring variable stator winding is equal to that of the ring variable rotor winding, and the ring variable stator winding is arranged in the middle or at any side of the winding accommodating groove; or, the ring-variable stator windings are symmetrically distributed with less middle and more sides, for example, the stator windings and the rotor are in a C shape, an oval shape, a triangle shape, etc. The above-described distribution of the windings can be achieved by setting the groove shape of the bobbin or the winding accommodating groove to the shape of the winding arrangement mode.

Preferably, the annular stator winding is connected with an excitation voltageU ₁ = Usin(ωt)Two-phase output signals are obtained at the stator winding of the rotary transformer assembly, and the output voltages are respectively as follows:U _C = KUsin(ωt)cos(pθ)，U _S = KUsin(ωt)sin(pθ)whereinKIn order to obtain the transformation ratio,Uin order to input the amplitude of the voltage,ωin order to be the frequency of the excitation,pthe number of the pole pairs is the number of the pole pairs,θis the rotor mechanical angle.

Preferably, the materials of the rotary transformer stator core, the rotary transformer rotor core, the ring transformer stator core and the ring transformer rotor core are all silicon steel sheets.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the axial length of the rotor core of the annular transformer assembly is greater than that of the stator core of the annular transformer assembly, the axial length of the winding accommodating groove of the annular transformer stator core is greater than that of the winding accommodating groove of the annular transformer rotor core, and meanwhile, the axial length of the rotor core of the rotary transformer assembly is smaller than that of the stator core of the rotary transformer assembly; when the rotor axially moves, the relative area of the stator core of the annular transformer assembly and the rotor core of the annular transformer assembly is basically kept unchanged, and the relative area of the stator core of the rotary transformer assembly and the rotor core of the rotary transformer assembly is basically kept unchanged, so that the change of a magnetic circuit during the axial movement of the rotor is reduced, the output transformation ratio and the phase shift of the brushless rotary transformer can still meet the normal working requirement, and the brushless rotary transformer has high reliability.

2. In the invention, compared with the traditional structure, the structure of the ring variable stator slot and the ring variable stator winding coil skeleton is changed and increased, so that the distribution mode of the ring variable stator winding coil is changed and increased, and under special working conditions, when the rotor axially moves, the output transformation ratio of the transformer can still meet the normal working requirement, and the reliability is higher.

Drawings

FIG. 1 is a schematic view of a rotating assembly and a ring assembly mounted on a rotating shaft.

FIG. 2 is a graph showing relative displacement between the rotor and stator during axial play; wherein, a is a schematic diagram when the rotor and the stator are centered, b is a schematic diagram when the rotor moves backwards to the limit position, and c is a schematic diagram when the rotor moves forwards to the limit position.

Fig. 3 is a circuit schematic of a brushless resolver.

FIG. 4 is a schematic diagram of a framework implementing different winding distributions in a cyclic assembly; the winding structure comprises a winding accommodating groove, a framework, a ring variable stator winding, a rotor and a ring variable stator winding, wherein a is a schematic diagram that the ring variable stator winding is laid in the winding accommodating groove, b is a schematic diagram that the framework is E-shaped, the ring variable stator winding is wound in the groove of the framework, C is a schematic diagram that the ring variable stator winding is C-shaped relative to the surface of the rotor, and the winding is symmetrically distributed with more sides and less middle, and d is a schematic diagram that the ring variable stator winding is triangular relative to the surface of the rotor, and the winding is symmetrically distributed with more sides and less.

FIG. 5 is a schematic diagram of different winding distributions achieved by slot shapes of winding accommodating slots in the ring transformer assembly; the winding accommodating groove is filled with the ring variable stator winding and the framework, the ring variable stator winding is symmetrically distributed with more sides and less middle relative to the surface of the rotor, and the ring variable stator winding is symmetrically distributed with more sides and less middle relative to the surface of the rotor.

FIG. 6 is a comparison of the output transformation ratio versus rotor axial position curve of the present invention versus a conventional brushless resolver for various winding distributions of FIG. 4; where a is a comparison graph in the case where the windings are distributed as shown in fig. 4a, b is a comparison graph in the case where the windings are distributed as shown in fig. 4b, c is a comparison graph in the case where the windings are distributed as shown in fig. 4c, and d is a comparison graph in the case where the windings are distributed as shown in fig. 4 d.

Fig. 7 is a comparison of the output transformation ratio versus rotor axial position curves of the present invention versus example 1 for various winding distributions of fig. 4.

FIG. 8 is a comparison of the output transformation ratio versus rotor axial position curves of the present invention versus conventional rotary transformer assemblies for various winding distributions of FIG. 5 and FIG. 4 a; where a is a comparison graph in the case where the windings are distributed as shown in fig. 5a, b is a comparison graph in the case where the windings are distributed as shown in fig. 5b, c is a comparison graph in the case where the windings are distributed as shown in fig. 5c, and d is a comparison graph in the case where the windings are distributed as shown in fig. 5 d.

Detailed Description

The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.