JP2024044891A - Axial direction counter resolver - Google Patents

Abstract

To provide a resolver structure that makes it possible to detect angles without being affected by eccentricity that causes resolver errors and that arises from the misalignment of the center of a revolving shaft with the center of a resolver rotor.SOLUTION: Provided is an axial direction counter resolver 10 composed of a rotor 9R and a stator 9S that are arranged in an axis A direction around an axis A, i.e., a thrust direction T. The rotor 9R includes a rotor iron core 3 and a rotor transformer 7, and the stator 9S includes a stator iron core 1 and a stator transformer 5. A coil 4 is wound around the rotor iron core 3 and a coil 2 is wound around the stator iron core 1, while the rotor transformer 7 and the stator transformer 5 are accommodated in a bobbin 8 and a bobbin 6, respectively. The stator iron core 1 and the rotor iron core 3, and the stator transformer 5 and the rotor transformer 7, respectively, are arranged facing each other in the axis A direction, so that magnetic flux exchanges for angle detection are carried out in the thrust direction T.SELECTED DRAWING: Figure 1

Description

The present invention relates to an axially opposed resolver, and particularly to a technique for reducing electrical errors in a resolver.

FIG. 4 is an explanatory side sectional view showing the configuration of a conventional resolver. As shown in the figure, a conventional resolver 510 has a rotor 59R on the inside and a stator 59S on the outside of the rotor 59R, with the rotor 59R having a rotor core 53 and a rotor transformer 58, and the stator 59S having a stator core 51. This configuration includes a stator transformer 56 and a stator transformer 56. A coil 54 is wound around the rotor iron core 53, a coil 52 is wound around the stator iron core 51, a coil 57 is wound around the rotor transformer 58, and a coil 55 is wound around the bobbin B housed in the stator transformer 56. wrapped around it. The rotor core 53 and the stator core 51 and the rotor transformer 58 and the stator transformer 56 face each other in the radial direction R, and magnetic flux is exchanged in the radial direction R for angle detection.

Patent applications have been filed for techniques to reduce errors in resolvers. For example, Patent Document 1, listed below, discloses a resolver capable of reducing errors contained in detected angle position information, which has a structure including a first jumper wire that connects a search coil section in the first layer of the search coil to a rotor-side rotary transformer, a second jumper wire that connects search coil sections in the second layer of the search coil, and a land that guides the second jumper wire from the second coil-forming layer to the first coil-forming layer when the first jumper wire is formed in the first coil-forming layer, thereby forming at least a portion of the second jumper wire in the first coil-forming layer.

JP 2019-190968 Publication “Resolver”

The conventional resolver 510 shown in Figure 4 cannot perform satisfactorily unless the coaxiality between the center of rotation of the shaft A and the rotor 59R is strictly controlled. If the coaxiality is low, the distance between the cores changes during rotation, which causes electrical errors. A solution to this problem is required.

The problem that this invention aims to solve is to eliminate the problems of the conventional technology and provide a resolver structure that can detect angles without being affected by eccentricity caused by the misalignment between the center of the rotating shaft and the center of the resolver rotor, which is a cause of resolver errors.

As a result of considering the above-mentioned problem, the inventor of the present application came up with a method in which magnetic flux is exchanged in the thrust direction so that the distance between opposing cores remains constant at the attached position and changes in the distance between the cores are suppressed. Furthermore, the area of the stator teeth is formed to be larger than the area of the rotor teeth, so that even if eccentricity occurs, the opposing surfaces of the rotor teeth are within the range of the opposing surfaces of the stator teeth. Based on these ideas, the present invention was completed. That is, the invention claimed or at least disclosed in this application as a means for solving the above problems is as follows.

[1] An axially opposed resolver comprising a stator core, a rotor core, a stator transformer, and a rotor transformer, the stator core-rotor core and the stator transformer-rotor transformer being arranged opposite each other in the axial direction, whereby magnetic flux for angle detection is exchanged in the axial direction.
[2] The axially opposed resolver according to [1], characterized in that the area of the opposing surface of the stator iron core is larger than that of the rotor iron core, and the area of the opposing surface of the stator transformer is larger than that of the rotor transformer.
[3] The axially opposed resolver according to [2], characterized in that the area of each of the stator core and the stator transformer is large enough that the opposing area does not change even if eccentricity occurs in the rotor.

[4] The axially opposed resolver according to [3], wherein the stator core and the rotor core are formed by laminating a plurality of core plates.
[5] The axially opposed resolver according to [4], wherein the iron core plate is a substantially U-shaped plate having two teeth.
[6] The axially opposed resolver described in [5], characterized in that the iron core formed by stacking the U-shaped plates is fixed to an iron core supporter consisting of an arm portion fitted inside the U-shaped plates and a ring portion around which a required number of the arm portions are arranged.

The axially opposed resolver of the present invention is configured as described above, and therefore can detect angles without being affected by eccentricity caused by a misalignment between the center of the rotating shaft and the center of the resolver rotor, which is a cause of resolver error. In other words, with the axially opposed resolver of the present invention, even if eccentricity of the rotor occurs, the movement of the cores is only in the radial direction, and does not lead to a change in the distance between the cores, so the second-order error components can be effectively reduced.

In addition, by creating a configuration in which the area of the facing surfaces of the stator and rotor differ, it is possible to prevent changes in the facing area of the cores due to rotor eccentricity, and even if there is eccentricity, a change in the output voltage will not occur. First, it is possible to prevent an adverse effect on detection accuracy.

As a result, the present invention allows for rougher tolerance setting for the concentricity of the rotor and the center of rotation than ever before, reducing the processing costs on the mounting side. In addition, if the core is manufactured using a laminated iron core rather than by machining, this can also reduce costs.

FIG. 2 is a side sectional view illustrating the configuration of an axially opposed resolver according to the present invention. 1 is a side sectional view illustrating a configuration of an axially opposed resolver of the present invention in which a difference is provided in the opposing areas between a rotor and a stator; FIG. FIG. 2 is a perspective explanatory diagram showing an example of the iron core configuration of the axially opposed resolver of the present invention. FIG. 2 is an explanatory plan view showing an example of a method for fixing an iron core of an axially opposed resolver according to the present invention. FIG. 2 is an explanatory side cross-sectional view showing the configuration of a conventional resolver.

The present invention will now be described in detail with reference to the drawings.
1 is an explanatory side cross-sectional view showing the configuration of an axially opposed resolver of the present invention. As shown in the figure, this axially opposed resolver 10 is configured with a rotor 9R and a stator 9S arranged on the axis A, i.e., in the thrust direction T, with the axis A as the center (in the figure, the rotor 9R is on the top and the stator 9S is on the bottom). The rotor 9R is equipped with a rotor core 3 and a rotor transformer 8, and the stator 9S is equipped with a stator core 1 and a stator transformer 6.

Coil 4 is wound around rotor core 3, and coil 2 is wound around stator core 1. Bobbin B wound with coil 7 is housed in rotor transformer 8, and bobbin B wound with coil 5 is housed in stator transformer 6. Stator core 1-rotor core 3, and stator transformer 6-rotor transformer 8 are arranged facing each other on axis A, so that magnetic flux for angle detection is exchanged in the direction of axis A, i.e., thrust direction T.

According to the axially opposed resolver 10 of the present invention having such a configuration, an angle can be detected by exchanging magnetic flux in the thrust direction T rather than in the radial direction. The conventional resolver 510 shown in FIG. 4 exchanges magnetic flux in the radial direction R, and when the distance between the cores changes due to eccentricity, the secondary component of the error increases. However, by creating a structure in which magnetic flux is exchanged in the axial direction as in the present invention, the distance between the cores does not change even if eccentricity occurs, so it is easier to install without worrying about eccentricity than before. , can be used.

FIG. 1-2 is an explanatory side sectional view showing the configuration of the axially opposed resolver of the present invention in which the rotor and the stator have different opposing areas. As shown in the figure, in addition to the configuration described with reference to FIG. The area of the opposing surfaces may be formed to be large. The area of each of the stator core 21 and the stator transformer 26 is set to such a degree that the facing area does not change even if eccentricity occurs in the rotor.

With this configuration, even if rotor eccentricity occurs in this axially opposed resolver 210, the opposing surface of the rotor iron core 23 is covered by the opposing surface of the larger stator iron core 21, and the opposing surface of the rotor transformer 28 is covered by the opposing surface of the larger stator transformer 26. Therefore, even if eccentricity occurs, there is no change in the opposing area between the rotor iron core 23 and the stator iron core 21, or between the rotor transformer 28 and the stator transformer 26. As a result, there is no change in the output voltage, and there is no adverse effect on detection accuracy. This makes it possible to roughly set tolerances for the concentricity of the rotor and the center of rotation.

FIG. 2 is a perspective explanatory diagram showing an example of the iron core configuration of the axially opposed resolver of the present invention. As shown in the figure, the stator core and rotor core of the axially opposed resolver can be formed by laminating a plurality of core plates K, K, . . . . As the iron core plate K, an electromagnetic steel plate can be suitably used. Further, as shown in the figure, as the iron core plate K, a substantially U-shaped plate having two teeth Kt, Kt can be used, and the iron core can be formed by laminating the plates.

FIG. 3 is an explanatory plan view showing an example of a method for fixing an iron core of an axially opposed resolver according to the present invention. That is, the iron core 13 formed by stacking the U-shaped plates K may be fixed to the case using an iron core support J having a predetermined structure. As shown in the figure, the iron core support J is made up of a required number of arm parts Ja fitted inside a U-shaped plate and a ring part Jc around which the arm parts Ja, Ja, . . . It is formed.

The axially opposed resolver of the present invention can detect angles without being affected by eccentricity caused by a misalignment between the center of the rotation axis and the center of the resolver rotor, which is a cause of resolver error. Therefore, this invention has high industrial applicability in the fields of resolver manufacturing, use, and all related fields.

1, 21... Stator core 2, 22... Coil 3, 23... Rotor core 4, 24... Coil 5, 25... Coil 6, 26... Stator transformer 7, 27... Coil 8, 28... Rotor transformer 9R, 29R... Rotor 9S, 29S...Stator 10, 210...Axially opposed resolver 13...Iron core A...Axis B...Bobbin J...Iron core support Ja...Arm Jc...Annular part K...Iron core plate Kt...Teeth T...Thrust Direction (axial)

51... Stator core 52... Coil 53... Rotor core 54... Coil 55... Coil 56... Stator transformer 57... Coil 58... Rotor transformer 59R... Rotor 59S... Stator 510... Resolver A... Axis B... Bobbin R... Radial direction ( radial direction)

Claims (6)

A resolver comprising a stator core, a rotor core, a stator transformer, and a rotor transformer,
The stator core and the rotor core, and the stator transformer and the rotor transformer are arranged to face each other in the axial direction,
An axially opposed resolver characterized in that magnetic flux for angle detection is exchanged in the axial direction. An axially opposed resolver as described in claim 1, characterized in that the area of the opposing surface of the stator iron core is larger than that of the rotor iron core, and the area of the opposing surface of the stator transformer is larger than that of the rotor transformer. The axially opposed resolver according to claim 2, wherein the area of each of the stator core and the stator transformer is such that even if eccentricity occurs in the rotor, the opposing area does not change. . The axially opposed resolver of claim 3, characterized in that the stator core and rotor core are formed by laminating multiple core plates. The axially opposed resolver of claim 4, characterized in that the iron core plate is a substantially U-shaped plate having two teeth. 6. The axially opposed resolver according to claim 5, wherein the iron core formed by stacking the U-shaped plates is fixed to an iron core support comprising an arm portion fitted inside the U-shaped plates and a ring portion around which a required number of the arm portions are arranged.